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Wire Straightening Dies

Wire straightening dies are used in wire drawing machines, wire drawing machines, drawing machines, and straightening machines as one of the processing parts to make the diameter, roundness, internal metallographic structure, surface finish and straightening of wire or bar meet the raw material treatment requirements required for the production of metal products such as standard parts.

Description

UKO manufacture was excellent wear-resistant Wire Straightening Dies and Wire-guide Bushes for your wire processing operation, Tungsten Carbide Wire Guides Dies for Straightening Machines, Wire Drawing Machines, Wire Mesh Machines. Material supplied is rough or finished and polished.

Grade Carbide Content (%) Cobalt Content (%) Density (g/cm³) T.R.S (MPa) Hardness (HRA) Performance & Applications Recommended
YG6X 94 6 14.95 1800 91.5 For drawing steel and nonferrous wires or bars of less than 6.00mm under not so much stress.
YG6 94 6 14.95 1900 90.5 For drawing steel, nonferrous alloy bars of less than 20.00mm under more stress and also for drawing tubes of less than 10.00mm.
YG8 92 8 14.8 2200 89.5 For drawing steel and nonferrous bars and tubes, also for manufacturing mechanical parts, tools, and wear parts.
YG10 90 10 14.5 2400 88.5 Same above
YG15 85 15 14 2800 87 For drawing steel bars and tubes with a high reduction rate and for manufacturing anvils, drilling and punching and impacting.

Carbide wire guid componentsCarbide Wire Guide Dies Including:

  • Tungsten carbide wire guides
  • Tungsten carbide bush
  • Carbide bunching and stranding dies
  • Tungsten carbide straightener dies

Drawing of wire straightening dies and guides

Why choose us?

  • With more than 16 years experience of in manufacturing tungsten carbide dies for the metalworking industry, for wire and bar drawing plants, UKO has gained business partners from various directions with positive feedback.
  • We make Carbide Wire Guides which are used in spring manufacturing machines. We use good wear-resistant grade Carbide for these wire guides for the wire cold form industry.
  • Feedback within 24 hours.
  • Professional suggestion on product.
  • Pood training export salesperson.
  • Skilled in tungsten carbide sell.
  • Could issue the C/O(certificate of origin)to the customer to reduce the tax.
  • Could accept all payment terms of T/T(both in advanced and after shipment), D/P, D/A, L/C, western union, PayPal and etc.
  • Could offer free samples below 0.5kgs under the condition of freight paid by the customer.
  • MOQ 5kgs for sintered blank.

Resource

FAQ

How to correctly choose the saw blade according to the woodworking saw blade parameters?2021-10-18T02:42:16+00:00

Woodworking circular saw blade is the most commonly used tool for wood products processing, but not all wood products are processed with the same woodworking circular saw blade. It is said that each lock corresponds to only one key, so different materials of wood require different Woodworking circular saw blade. There are many parameters involved in woodworking saw blades, such as: the choice of alloy type, base body, diameter, tooth number, thickness, and so on. The following tells you how to use these parameters correctly and reasonably to select the appropriate woodworking circular saw blade.

The first is the choice of alloy types. Commonly used types of cemented carbide are tungsten-cobalt (code YG) and tungsten titanium (code YT). Because tungsten-cobalt-based cemented carbide has better impact resistance, it is more widely used in the wood processing industry. The commonly used model in wood processing is YG8-YG15. The number after YG indicates the percentage of cobalt content. As the cobalt content increases, the impact toughness and bending strength of the alloy will increase, but the hardness and wear resistance will decrease. Choose according to the actual situation.

Then there is the choice of diameter. The diameter of the circular saw blade is related to the sawing equipment used and the thickness of the sawing workpiece. The diameter of the saw blade is small, and the cutting speed is relatively low; the large diameter of the saw blade has higher requirements on the saw blade and sawing equipment, and the sawing efficiency is also high. The outer diameter of the saw blade is selected according to different circular saw machine models to use the saw blade with the same diameter. The diameters of standard parts are: 110MM (4 inches), 150MM (6 inches), 180MM (7 inches), 200MM (8 inches), 230MM (9 inches), 250MM (10 inches), 300MM (12 inches), 350MM ( 14-inch), 400MM (16-inch), 450MM (18-inch), 500MM (20-inch), etc. The diameter of woodworking saw blades is mostly designed between 120MM-400MM.

The second is the choice of the number of teeth. Generally speaking, the more the number of teeth, the more cutting edges can be cut per unit time, and the better the cutting performance. However, more cutting teeth require more cemented carbide and the price of the saw blade High, but the saw teeth are too dense, and the chip volume between the teeth becomes small, which is easy to cause the saw blade to heat up; in addition, there are too many saw teeth. When the feed amount is not matched, the amount of cutting per tooth is small, which will increase the friction between the cutting edge and the workpiece , Affect the service life of the blade. Usually the tooth spacing is 15-25mm, and a reasonable number of teeth should be selected according to the material to be sawed.

The choice of woodworking circular saw blade requires reference of various parameters. In addition to the several parameters described above, there are some others, such as: thickness selection, tooth profile selection, aperture selection, etc. These parameters determine the saw blade The processing ability and cutting ability, and the choice of woodworking circular saw blades just affects your work efficiency and work results, and has a great impact on improving product quality and shortening working time. The above is about how to choose the right woodworking circular saw blade.

How To Make the Saw Teeth Sharp Again?

For any piece of circular saw blade, no matter where it is born or what material it is made of, they cannot avoid the fate of wear. Among the large family of saw blades, even high-performance multi-blade tools such as diamond saw blades、carbide saw, still need to bow their heads in the face of wear. The only difference may be that the wear occurs later.

In fact, the wear of saw blades has always been a headache for saw blade manufacturers and material sawing and processing companies. For producers, although they know that the market has very high expectations for the life of saw blades. But according to the current technical level and material technology, the saw blade manufacturer can be said to be powerful and has nowhere to use it. When faced with the endless chatter about the life cycle of buyers, they can only reply with consumables, and it is difficult to guarantee the use time as a reply.

From the standpoint of saw blade users, the high loss rate and high scrap rate actually mean that companies have to spend more money on purchases. Once the scale of the enterprise increases and the amount of saw blades increases, the problem of saw blade wear will eventually become an issue.

Judging from the above-mentioned interests of both parties, no one wants to have a very short life of the saw blade produced or in use. But the reality is that the wear of the saw blade is everywhere and occurs all the time. Many people think that only when the saw blade is in working condition, the saw blade will wear out. But in fact, even when the saw blade is in a non-working state, the wear of the saw blade will also occur.

From the perspective of the manufacturing process of a circular saw blade, whether the heat treatment process of the saw blade substrate passes the test, the technical level of the welding teeth, and whether the packaging and transportation can be fast and stable are all the links that will appear in the non-use stage of the saw blade. . Take the transportation of saw blades as an example. Wrong placement of saw blades and violent saw blade transportation will cause the saw blades to undergo changes in stress, and even the problems of tooth loss and wear during the transportation process.

Therefore, if a circular saw blade can be used for a long time, it is far from enough to rely on standard operation. On the contrary, from production to transportation, and then to use, any link cannot be ignored.

After a saw blade is actually working, as the amount of sawing tasks increases, the degree of wear of the saw blade itself will continue to deepen. Among them, mechanical impact wear and thermal wear are the two major causes of saw blade wear. Once the above-mentioned wear and tear are allowed to develop, the company’s own sawing cost is bound to be substantially increased invisibly. The final result is a decline in annual profitability.

Frankly speaking, we cannot avoid the wear of the saw blade. But after the saw blade is really worn, we can still make a difference, and then make the saw blade that is about to be scrapped “the sword is not old and returns to the edge.” According to the existing technology, in order to effectively make the worn saw blade be To use it efficiently, the most effective method is undoubtedly to sharpen the saw blade.

From the perspective of the saw blade grinding process, when a worn saw blade is sent to a professional saw blade manufacturer. Relevant grinding manufacturers will grind the saw blade at multiple levels and in all directions. It ranges from the leveling of the saw blade base to the fine grinding of the front angle, back angle and side angle of the saw blade. The complete set of saw blade grinding process reaches 18 steps.

After the above-mentioned multiple saw blade grinding processes, the performance of the ordinary carbide circular saw blade will be restored to the cutting performance of the new blade. It is imperative for the sawtooth to return to sharpness. For those saw blades with a very good foundation, such as high-performance multi-edged tools such as diamond saw blades, not only can they be sharpened more often than ordinary carbide saw blades, but the grinding effect is also better. good.

Of course, not all saw blades are suitable for grinding, for those with a very high degree of wear. For example, saw blades with large-scale tooth loss, or even saw blades with cracks in the substrate, basically lose the need for grinding. Therefore, for those companies that do not understand saw blade grinding, before trying to establish a cooperative relationship with saw blade grinding manufacturers, it is very necessary to ask whether their saw blades are likely to be repaired.

What are the common problems of woodworking circular saw blades?

  • What is the difference between the professional and ordinary woodworking circular saw blades?

Chinese brands can adequately meet the needs of diy use. The distinction between grades is the difference in durability, which is the service life, and also involves the production process, such as whether the thickness of the saw body is uniform, the concentricity of the outer circle and the inner circle, and the serrated The quality of the welding process seems to be very simple to make the saw blade, but it is difficult to do it well. For the user, the Chinese product technology is good enough, even for the big brands in Europe and the United States, a large part of it is produced in China. Yes, the staggered teeth are cut wood, and the ladder flat teeth are cut aluminum alloy.

  • How to define the specifications of woodworking circular saw blades?

Outer diameter-inner diameter-tooth thickness-number of teeth,
The label 210*30*2.0*45 means: the outer diameter is 210 mm, the inner diameter is 30 mm, the tooth thickness is 2.0 mm, and the number of teeth is 45 teeth.

  • What power tools can woodworking circular saw blades be used for?

Electric circular saws and table saws can be used. Of course, they cannot be used indiscriminately. The following conditions must be met:

  1. The outer diameter of the saw blade must meet the maximum value of the electric circular saw;
  2. The inner diameter of the saw blade must be consistent with the saw blade pressing plate, otherwise there will be problems such as failure to install or slip, the most important thing is that the saw blade must be consistent with the product.
  • Is there a distinction between left and right for woodworking electric circular saw blades?
  1. It must be installed in the direction of the arrow marked on the woodworking electric circular saw blade, and the saw blade cannot be installed backwards.
    note:
    Make sure that the direction of the saw blade is consistent with the direction of rotation of the saw blade (the arrow on the saw blade should point in the same direction as the arrow on the circular saw).
  2. The inner pressure plate boss has a diameter of 30 mm on one side and 20 mm on the other side. Use the correct side according to the hole diameter of the saw blade you want to use. Incorrect installation may cause dangerous vibrations.

How to sharpen circular saw blades?

Note that the front-to-back ratio is 1: 3, The minimum remaining length and width of the tungsten carbide saw blade measured from the tooth seat must not be less than 1mm; it must be performed strictly in accordance with relevant operations, non-professionals cannot operate, and the correct method for repair The saw blade can only be used within a reasonable life span if it is not sharpened. If it is not properly ground, it will only reduce the efficiency and quality of the circular saw blade.

It is strictly forbidden to grind only from the front corner surface or only from the rear corner surface. This will greatly shorten the service life of the circular saw blade and also affect the next grinding status! Another important point is that the entire wear area should be fully sanded. The circular saw blade is ground on an automatic sharpener. If it is manually ground on a general-purpose sharpener, it will seriously affect the quality of use.

(The CNC sharpening machine can ensure that the grinding of the front corner surface and the rear corner surface is completely in the same direction.) In order to prevent large wear on the grinding wheel, it is necessary to leave sufficient side protrusions from the side of the sawtooth to the saw body. On the other hand, the largest side protruding part should not be greater than 1.0-1.2 mm on each side to ensure the stability of the saw blade teeth.

Chip groove
Try to ensure the space for chip removal, and avoid the situation that the chip groove needs to be repaired at the same time due to the grinding of the saw teeth.

If the tooth breaks down, you must go to the grinding center to change the teeth. When welding, pay attention to the appropriate welding sound or another solder, preferably with a high-frequency welding machine.

Leveling and stressing
If you want to use a circular saw blade to ensure its quality, you must use the leveling and stressing procedures. Do not use it because of trouble. Each time you grind, check the blade’s flatness and stress value. ? And correct. Leveling can reduce the tolerance of the blade’s runout, and add stress to the strength and elasticity of the blade. This is an essential process for thin saw blades; the relationship between the outer diameter of the circular saw blade and the outer diameter of the flange It can be found in the DIN8083 standard; the outer diameter of the flange should not be less than 25-30% of the outer diameter of the circular saw blade.

Analysis of the grinding effect of cemented carbide saw blades for circular saw blades
Under normal circumstances, most circular saw blades on the market can be ground after a certain period of time. The main purpose is to repair the teeth, make them sharper, maintain the stability of the saw and the quality after cutting, such as carbide saws. Tablets can generally be ground one to three times. The specific number of times depends on the actual use.

There are several ways for the grinding of cemented carbide saw blades, but generally, all use alloy wheels for grinding, and what we are concerned about is the quality after grinding, that is, the use after repairing;

Effect analysis: According to the practical situation, we can judge that the user is most concerned about after grinding:

1. Service life
Effect analysis: After grinding the carbide saw blade, will the service life be reduced compared to the previous one? This will be directly linked to the subsequent cost and benefits of the user. The answer is yes, but if the grinding process is very good, it can reach 70% of the previous time, or even higher. This requires the user to inspect the grinder. Be sure to find a regular and experienced manufacturer for grinding operations.

2. Cut off quality
Analysis of the effect: The quality of workpiece cutting is a responsibility to the market and customers. If the carbide saw blade is ground, the quality of the workpiece is reduced, which is a very unoptimistic thing, which will affect the business of the enterprise. Development, if the customer is not satisfied with the quality, then the subsequent grinding is not necessary at all; in view of this situation, in fact, the user does not have to worry too much, under normal circumstances, the grinding of the carbide saw blade will not affect The original purpose of cutting the quality of the workpiece is to maintain the sharpness of the sawtooth and the quality of the cutting. As long as the user chooses the grinding, do not choose a small processing workshop or an informal enterprise. Generally, the core of quality can be guaranteed;

3. Stability when sawing
Effect analysis: Regarding the stability, unless it is a very poor grinding process, there will be no impact on the stability of the carbide saw blade after grinding.

What are the woodworking circular saw blades? How is it classified?

Classification of saw blades
I. Classification according to different materials: high-speed steel saw blades (HSS saw blades), overall hard alloy saw blades, tungsten steel saw blades, toothed alloy saw blades, diamond saw blades, etc.

2. Classification according to the application: milling cutter blades, machine blades, manual saw blades, metal special saw blades (aluminum saw blades, copper cutting blades, stainless steel saw blades, etc.), pipe cutting circular saw blades, wood Saw blades, stone saw blades, acrylic saw blades, etc.

3. Classification of surface coating: white steel saw blade (natural color), nitrided saw blade (black), titanium-plated saw blade (gold), chromium nitride (color), etc. 4. Other classifications and titles: cutting saw blades, cutting saw blades, grooving saw blades, cutting saw blades, overall saw blades, incisive saw blades, ultra-thin saw blades.

How to install woodworking circular saw blades?

Before installing the circular saw blade, first check the teeth for defects, shedding, abnormal wear, and bending, twisting and cracking of the saw disk. During installation, ensure that the rotation direction of the saw blade is consistent with the rotation direction of the main shaft of the machine

In addition, please pay attention to confirm that the selected saw blade is suitable for the speed and feed of the material being cut. ;

Every time you install the flange, you must ensure that the surface of the flange is flat and clean, parallel to each other and perpendicular to the axis, and the size must be the same. The minimum diameter of the flange is 1/3 of the diameter of the saw blade, and the gasket should be vertical;

The height of the saw blade should be at least equal to the height of the saw blade. When processing, the saw blade should be at least 3 teeth at the same time, otherwise the saw blade will sway.

What is pcd saw blade chipboard saw blade?

PCD saw blades, or diamond saw blades, are typical representatives of superhard tools. The PCD saw blade has a Vickers hardness of 10000HV, strong acid resistance, and the blade is not easy to passivate. As a typical representative of super-hard cutting tools, PCD diamond saw blades lead the woodworking dry cutting operation. Woodworking machinery cutting processing operations to improve production efficiency and production quality, high-quality PCD saw blades are essential.

Science and technology as the first productive force is the biggest driving force for innovative technology and new products. The application of PCD saw blades as super-hard tool materials have always been a high-quality performance of science and technology.

The PCD saw blades produced by our company are made of high-quality alloy steel as the base, and the composite diamond cutter heads with excellent performance are simultaneously formed by electro-discharge mechanical electrolytic grinding technology. The well-designed dynamic balance and scientifically created heat dissipation solve the continuous long-life cutting of the woodworking machinery production line. It is a powerful wealth cutting tool for particleboard, high and medium density board, and high-speed super-finishing.

As the basis of excellent performance, the field test standard can be used continuously for 300-400 hours; strong wear resistance can be re-grinded for many times. It is configured for precision electronic saws and sliding table saws. The maximum scrap time can reach 4000 hours/piece. This provides strong product technical support for carpentry operations, saves many troubles to replace the tool, and minimizes the production cost of the enterprise.

Durability and durability are the advantages of PCD diamond saw blades compared to carbide saw blades. The actual customer test effect of Zhuzhou UKO PCD saw blades exceeds 40-50 cemented carbide saw blades, which provides strong product and service support for the long-term continuous operation of woodworking dry cutting operations.

For woodworking cutting operations, cross-cutting, longitudinal sawing, sawing wooden composite materials, sawing non-ferrous metals, sawing metals, sawing picture frames, sawing plexiglass, sawing hard plastics, sawing veneers, veneers Grooving and grooving with wood composite materials are all manifestations of high-quality cutting performance.

For softwood, hardwood, MDF, non-ferrous metal, square tube, plywood, profile, single veneer, veneer, aluminum, angle iron, double veneer, picture frame, plastic, round tube, particleboard, organic glass, etc. Cutting operations have good performance.

What are tungsten steel rods used for?2021-10-16T08:05:09+00:00

Tungsten steel rods are widely used as materials, such as milling cutters, planers, drills, boring cutters, etc., for cutting cast iron, non-ferrous metals, plastics, chemical fibers, graphite, glass, stone and ordinary steel, and can also be used for cutting Heat-resistant steel, stainless steel, high manganese steel, tool steel and other difficult-to-process materials. Tungsten steel can also be used to make rock drilling tools, mining tools, drilling tools, measuring tools, wear-resistant parts, metal abrasive tools, cylinder linings, precision bearings, nozzles, etc.

Features of tungsten steel round bar:

  • Use high-quality ultra-fine tungsten carbide and imported cobalt powder as raw materials.
  • It has high strength and high hardness.
  • It has excellent red hardness, good wear resistance, high elastic modulus, high bending strength, good chemical stability (acid, alkali, high temperature oxidation), good impact resistance, low expansion coefficient, thermal conductivity, electrical conductivity and Feature similar to iron and its alloys.
  • High-tech precision advanced equipment: 10MPa low pressure sintering furnace imported from Germany for sintering.
  • Unique new technology: vacuum high temperature and high pressure sintering. The product adopts pressure sintering in the final stage, which greatly reduces the porosity, improves the compactness, and greatly improves the mechanical properties of the product.
  • Product features: There are many material grades, which can be applied to the needs of different uses; the specifications are complete, and the blank size is accurate (reduce the processing volume and improve the production efficiency).

Which occasions are cemented carbide rods suitable for?

The main uses of cemented carbide bars are:

  • Cemented carbide bars are suitable for micro-drilling.
  • Cemented carbide bars have good wear resistance and bending resistance. They are mainly used to produce extruded bars, suitable for general drills, knives and other wear-resistant parts.
  • Cemented carbide bars have good wear resistance and bending resistance. They are mainly used to produce extruded bars, making small-diameter micro-drills, cutting tools for watch processing, integral reamers and other cutting tools and wear-resistant parts.
  • The cemented carbide rod is an ultra-fine particle tungsten steel material. This tungsten steel rod has the characteristics of high hardness, good bending strength, wear resistance, not easy to collapse, and not easy to break. It is a special material for micro drills, widely used in tungsten steel milling cutters, engraving knives and wear-resistant parts.

How to cut tungsten carbide rod?

Tungsten carbide rod is a material with high hardness, which is difficult to achieve by other mechanical processing methods. Wire cutting is more suitable, but due to the unevenness of the “internal energy” of the cemented carbide, especially large cemented carbide, It is easy to produce cracks during processing. So how to avoid this situation?

  • From the perspective of producing tungsten carbide blanks, when sintering large cemented carbides and subsequently performing wire-cutting of carbide blanks, the heating and cooling rates should be slowed down and extended as far as possible within the permitted technical range High temperature holding time;
  • From the perspective of the processor, it is recommended to allow the Tungsten Carbide Rods to age naturally in the open air or indoor floors for a period of time. It is recommended to avoid using sintered materials for 1 to 2 months. Conditional units can also perform cold treatment on cemented carbide (0 ℃ ~ 10 ℃);
  • Before machining, it is necessary to rough grind the cemented carbide, and then cut it for a few days; if it can be rough ground before natural aging, it is more stable.
  • In short, the main point is to release the internal energy [stress] of the cemented carbide as far as possible to the minimum to prevent it from forming a destructive force.

Wire cutting hard alloy molybdenum wire is easy to break

  • Regarding the problem of wire cutting and cutting of hard alloy molybdenum wires, we need to start with adjusting various parameters of wire cutting machine tools.
  • Replace with new guide wheels and conductive blocks;
  • Replace the wire cutting fluid with new ones. When wire cutting Carbide Rods, there are too many electro-corrosives. It is easy to reduce the chip removal effect of the wire cutting fluid. You can replace the wire cutting fluid with a new one in advance and improve it appropriately. The proportioning concentration of wire cutting fluid. In addition, it is also possible to choose a water-based cutting fluid such as a wire cutting working fluid with good chip removal performance;
  • The machine parameters should be stable, the wire cutting molybdenum wire should not be too tight, and the wire rack should not be too high! The speed cannot be too fast. If it is hl, the frequency conversion of the system must be stable! In terms of current, keep 2.5A. Be careful not to exceed 3A. Amplify the pulse width and pulse width.

What products are carbide rods mainly used for?

Carbide rods are mainly suitable for drills, end mills, and reamers. It can also be used for cutting, punching and measuring tools. It is used in the paper, packaging, printing, and non-ferrous metal processing industries.

In addition, it is also widely used for processing high-speed steel tools, carbide milling cutters, carbide cutters, NAS cutting tools, aviation tools, carbide drills, milling cores, high-speed steel, tapered milling cutters, metric Milling cutters, miniature end mills, ream pilots, electronic cutters, step drills, metal cutting saws, double guarantee gold drills, gun rods, angle cutters, carbide burrs, carbide cutters, etc.

How to make carbide strips?2021-10-16T04:16:39+00:00

Cemented carbide strips are mainly made by mixing WC tungsten carbide and Co cobalt powder by metallurgy, milling, pressing, sintering. The main alloy composition is WC and Co. WC in cemented carbide strips for different purposes It is not consistent with the composition content of Co, and is widely used.

One of the many materials of cemented carbide strips, which is named for its rectangular plate (or square), also known as cemented carbide strips.

Process flow

Milling → Formulation according to application requirements → Wet grinding → Mixing → Crushing → Drying → Screening → After adding the molding agent → Redrying → Screening to obtain the mixture → Granulation → Pressing → Forming → Low-pressure sintering → Forming (blank ) → Flaw inspection → Packaging → Storage.

Performance characteristics

Cemented carbide strips have excellent hardness, high hardness, good wear resistance, high elastic modulus, high compressive strength, good chemical stability (acid resistance, alkali resistance, high-temperature oxidation), low impact toughness, and expansion coefficient Low, thermal conductivity and electrical conductivity are similar to iron and its alloys.

How to buy carbide strips?

The tungsten carbide strips are generally purchased from these aspects:

  1. The compactness of the cemented carbide strips;
  2. Abrasion resistance of cemented carbide strips;
  3. The impact resistance of the carbide strips;

UKO’s hard alloy strips use cold isostatic pressing and low-pressure sintering technology to ensure that the strips are free of trachoma and pores, are not easy to crack during cutting, and have good wear resistance and strong impact resistance.

What is the use of carbide strips?

Carbide strips are mainly composed of WC tungsten carbide and Co cobalt powder mixed by metallurgical methods through powdering, ball milling, pressing, and sintering. The main alloy components are WC and Co. The content of ingredients is not consistent with that of Co, which makes it widely used. One of the many materials of cemented carbide strip is named after its rectangular bar shape, also known as cemented carbide strip bar.

Carbide strip performance:

Carbide strips have excellent warp hardness, high hardness, good wear resistance, high elastic modulus, high internal compressive strength, good chemical stability (acid resistance, alkali, high temperature oxidation), low impact toughness, expansion The coefficient is low, and the characteristics of thermal conductivity and electrical conductivity are similar to those of iron and its alloys.

Carbide strip application range:

Carbide strips have the characteristics of high red hardness, good weldability, high hardness, and high wear resistance. They are mainly used in the production of woodworking reversible knives, MDF, gray cast iron, non-ferrous metal materials, chilled cast iron, hardened steel, PCB, brake material. When using it, you should select the hard alloy strip with suitable material according to the application.

What are cemented carbide balls and what are they used for?2021-10-16T03:44:11+00:00

Cemented carbide balls, commonly known as tungsten steel balls, refer to balls and balls made of cemented carbide. carbide balls have high hardness, wear resistance, corrosion resistance, resistance to bending, and harsh use environment. They can replace all the steel balls  products.

Tungsten Carbide Balls have a wide range of applications, such as precision bearings, instruments, meters, pens, sprayers, water pumps, mechanical parts, sealed valves, brake pumps, squeeze holes, oil fields, hydrochloric acid laboratories, hardness measuring instruments, Fishing gear, counterweight, decoration, finishing, etc.

Type: Carbide balls are made of carbide (WC, TiC) micron powder of high hardness refractory metal, with cobalt (Co) or nickel (Ni), molybdenum (Mo) as binder, Powder metallurgy products sintered in furnaces or hydrogen reduction furnaces. At present, common hard alloys include YG, YN, YT, and YW series.

Commonly used cemented carbide balls are divided into YG6 Tungsten Carbide Balls YG6x Tungsten Carbide Balls YG8 Tungsten Carbide Balls YG13 Tungsten Carbide Balls YG20 Tungsten Carbide Balls YN6 Tungsten Carbide Balls YN9 cemented carbide balls.YN12 cemented carbide ball. YT5 cemented carbide ball. YT15 cemented carbide ball.

Features: Cemented carbide balls have high hardness, wear resistance, corrosion resistance, resistance to bending, and harsh environment. They can replace all steel ball products. Carbide ball hardness ≥90.5, density = 14.9g / m³.

What Is Heading?2021-10-16T03:47:37+00:00

Heading is a processing method that uses forging machinery to apply pressure to metal blanks to produce plastic deformation to obtain forgings with certain mechanical properties, certain shapes and sizes. Forging (forging and stamping) is one of the two major components.

Forging can eliminate defects such as loose as-cast during the smelting process and optimize the microstructure. At the same time, due to the preservation of complete metal flow lines, the mechanical properties of forgings are generally better than castings of the same material. For the important parts of related machinery with high load and severe working conditions, forgings are mostly used except for simpler shapes that can be rolled, profiles or welded parts.

Manufacturing Method of Cold Heading Dies

Cold Heading Dies and processing method, which includes a core, a molded sleeve, a screw sleeve, and an ejector rod. The core includes a core head, a cushion block, a core-forming part, and a core tail. Each part of the core is provided with a through-hole.

This cold heading mold core is installed in the core through an interference fit. When the core is installed, the core and the mold sleeve must be installed with good concentricity. If the concentricity between the core and the mold sleeve is large, The deviation will affect the quality of cold heading products on the one hand and the service life of the core and the sleeve on the other.

In addition, because the mold core is a wearing part, it needs to use a large thrust to withdraw the mold core from the mold sleeve after large wear of the mold core and then replace the mold core again.

Due to the interference fit between the mold core and the mold sleeve, it is also easy to cause damage to the mold sleeve during the replacement process, affecting the assembly accuracy and actual service life between the mold core and the mold sleeve.

How Long Is the Service Life of Cold Heading Dies?

How long the cold heading dies can be used depends on whether the material used in the mold is good or bad, whether the mold structure is reasonable or not, and the strength of the processed material.
If it is non-ferrous metal materials such as copper and aluminum, the service life of the mold will be much longer, if it is iron material, the service life of the mold will be much shorter.

How to Choose the Grade of Hard Alloy Cold Heading Die?

  1. How to choose the brand of hard alloy cold heading die reasonably?Under the wear-resistant working conditions of hard alloy cold heading die under impact or strong impact, the commonality is that the hard alloy has good impact toughness, fracture toughness, fatigue strength, bending strength and good wear resistance. Usually, medium, high cobalt and medium and coarse grain alloy grades are used, such as YG15C, YG20C, YG25C and other grades.Generally speaking, the relationship between wear resistance and toughness of cemented carbide is contradictory: the increase in wear resistance will lead to a decrease in toughness, and the increase in toughness will inevitably lead to a decrease in wear resistance. Therefore, when choosing the alloy grade of Jinboshi cold heading die, it is necessary to meet the specific requirements according to the processing object and processing working conditions.If the selected brand is prone to cracking and damage early in use, a brand with higher toughness should be selected; if the selected brand is prone to early wear and damage during use, a brand with higher hardness and better wear resistance should be used . The following grades: YG15C, YG18C, YG20C, YG22C, YG25C from left to right, the hardness is reduced, the wear resistance is reduced, and the toughness is improved; otherwise, the opposite is true.
  2. The requirements of the hard alloy cold heading die on the equipment.Attention should be paid to the cold heading mold during use:a. The stamping machinery should be in good working condition;

    b. The matching seat of the mold support should not be scratched or tilted;

    c. The working end faces of the female mold and the punch should be balanced;

    d. When adjusting the equipment, it is not allowed to hit the carbide die with an punch;

    e. When cold heading die or extrusion die works, it is better to use proper lubricant.

    3. The requirements of the hard alloy cold heading die for the processed parts

The surface of the processed material of cemented carbide round rods should be smooth and free from defects such as scale, cracks and scratches. The material with high surface quality is not easy to break during cold heading, and it is not easy to scratch the mold. The surface quality of the parts is good.

What is PCD wire drawing dies?2021-09-28T08:03:52+00:00

PCD is commonly known as the “artificial diamond”, PCD is a top-quality material for wire drawing dies. Its working life is 15-25 times the working life of tungsten carbide dies so that improving efficiency and saving cost for users.

Polycrystalline Diamond (PCD) Wire Drawing Dies that can be used for a wide range of drawing applications. PCD Dies offer a high resistance to wear and an excellent wire surface finish. The dies can be used in ferrous and non-ferrous wire drawing applications.

What kinds of drawing die core materials?

The drawing core is the core component of the diamond wire drawing die, which can be divided into a PCD (polycrystalline diamond) Core, CVD Diamond Core, and Single-crystal Diamond Die Core three categories.

  • PCD Core
    The common brushed core models in the market include SD, CXD, and CXT series. The success of PCD has brought great changes to the wire draw industry, which makes the entire processing process more efficient and stable. The PCD is sintered by the micrometer diamond particles and the binding agent to be sintered under high temperature and high-pressure conditions, the hardness is high, the wear resistance, the impact resistance is strong, and the advantages of uniform wear and long life during the mold use are applicable. High-speed draws. Since the PCD presents isotropic in macro, it does not occur like a single crystal diamond and a phenomenon of unevenness and the phenomenon of the mold hole. In addition, since the price of PCD is much lower than that of single-crystal diamonds, it has been widely used in the brushed industry. Most diamond drawings are used using a PCD brushed mold. The PCD core can be divided into cobalt-based and silicon groups. The cobalt-based PCD core contains a metal-binding agent, which has good processability, can be processed using a process of an electric spark, laser, ultrasonic wave, but the presence of cobalt makes diamonds easy to occur in high temperatures, so the core is Suitable for processing and use under conditions below 650 degrees Celsius. The silicon-based PCD core processability is relatively poor, but there is no metal-binding agent in the material, and thus the material can still maintain good thermal stability under 1000 degrees Celsius.
  • CVD Diamond Core
    CVD diamonds are also known as chemical vapor deposition diamonds, which are carbon-containing gas under high temperature and low-pressure conditions, depositing pure diamonds grown on the surface of the solid substrate. The CVD diamond has high hardness, good wear resistance, low friction coefficient, high surface finish, can be made of 0.02-1.0mm aperture drawing, for drawing stainless steel wire, tungsten wire, molybdenum wire, copper wire, aluminum wire, etc. Since the CVD diamond does not contain any binding agent, the CVD diamond brushed mold exhibits higher abrasion resistance, corrosion resistance, thermal conductivity, and thermal stability compared to the PCD. The disadvantage of this product is that its toughness is not as good as PCD, weak impact resistance, cracking, and brushed mold preparation is also strict than PCD.
  • Single Crystal Diamond Core
    The single-crystal diamond has a high hardness and excellent wear resistance. The surface of the wire is tapered is high, but since the structure has an anisotropy, the hardness is also anisotropy, so that the wear of the mold hole is not Uniform, the product is not round, and the resources are rare, the price is expensive, and the fine line drawing die or finished drawing die is generally used as a high surface quality requirement. The single-crystal diamond brushed core is divided into two types: natural diamond brushed mold and artificial single-crystal diamond brushed mold core.
What kind of nail can you produce?2021-09-28T08:02:21+00:00

Nail types can be roofing nails, collated nails, flat coil nails, jumbo copl nails,canical nails, and so on.

What kind of nail cutter do you have?2021-09-28T08:01:31+00:00

Nail cutter for diamond point, clinch point, chisel point, and blunt point.

Do you have customized service?2021-09-28T08:00:22+00:00

Yes, we can accept the customized products. Our product applies for Wafios, and we can offer drawing for your reference.

Can you engrave my logo on the punch?2021-09-28T07:58:58+00:00

Yes, we could logo marking on the Waffles head as per your requirement.

What kind of types carbide roller do you have?2021-09-28T07:55:57+00:00

There are forming rolls (FO) oval reducing rolls (RO) /round reducing rolls(RT) / sizing rolls(CA) and profiling types. The wire diameter ranges from 3mm to 14mm.

What’s your regular dimension?2021-09-28T07:54:25+00:00

Ø 123 x Ø 82 x 15/20mm
Ø 125 x Ø 82 x 15/20mm
Ø 140 x Ø 90 x 15/20mm
Ø 150 x Ø 90 x 15/20mm
Ø 190 x Ø 90 x 15/20mm
Ø220 x Ø 130 x 15/20mm

Can I put my marking inside the rib?2021-09-28T07:53:32+00:00

Sure, we can engrave letters and figures inside the rib as your request.

How much life span for tungsten carbide roller?2021-09-28T07:52:39+00:00

It depends on the different types of rolls. For example, according to our customer’s feedback, PR6(125*82*15) can pull 3000-3500 tons of wire.

Which carbide rolls grade should I use?2021-09-28T07:51:17+00:00

It is decided by the rolling speed. YG15 is recommend for rolling machine less than 8m/s, YG16C is recommend for rolling machine over 8m/s.

How is the manufacturing technology of the mill rolls development?2021-09-28T07:49:39+00:00

Variety and manufacturing process of mill rolls with the progress of metallurgical technology and the evolution of rolling equipment.

  1. Medieval rolling soft non-ferrous metallic rolls.
  2. In the middle of the 18th century, Yeying, Master the production technology of cold cast iron rolls for rolled steel sheets.
  3. The advancement of European steelmaking technology in the next half of the 19th century requires rolling a larger tonnage of steel ingots, whether it is the strength of the gray cast iron or the cold cast iron rolls, with no requirements. The carbon content is 0.4% to 0.6%, the ordinary cast steel roller is born. The emergence of heavy-duty-duple forging equipment is further improved by the strong toughness of the forging rolls of this component.
  4. The introduction of alloying elements of alloy elements in the early 20th century significantly improves the wear resistance and toughness of cast steel and forged steel hot rolls and cold rolls. The surface quality of the rolled material is improved in the cast iron roll of the hot-rolled sheet. The composite casting of the rinsing method significantly increases the core strength of the cast roll.
  5. A large number of alloy elements in the roll is after the Second World War, this is the rolling equipment towards large, continuous, high speed, automation, and improved the strength of the rolling, and the deformation resistance increases higher requirements. the result of. A semi-steel roll and a ductile iron roll occurred in this period.
  6. After the 1960s, it was also developed successfully the powder tungsten carbide roll.
  7. In the early 1970s, the comprehensive performance of the roll rolls in Japan and Europe in the early 1970s, the overall performance of different temperature heat treatment technology, etc. Composite high chromium cast iron rolls are also successfully used in a tropical rolling mill. In the same period, forging white mouth iron and semi-steel rolls were applied in Japan.
  8. In the 1980s, Europe also introduced high-chromium rolls and ultra-deep hardening cold rolls, and special alloy cast iron rolls for small steel and wire finishing rolling. The development of contemporary rolled steel technology has prompted the development of higher performance rolls.
  9. Using centrifugal casting method and new composite method such as continuous casting compound (CPC), injection deposition method (Osprey method), electroflag welding method, and heat-like, a forged steel or pneumo Cast iron, the outer layer of high-speed steel series composite rolls and metal-ceramic rolls have been applied to Europe, Japan new generation profiles, wire, steel mills.
How to classify mill rolls?2021-09-28T07:47:41+00:00

There are a variety of classification methods of mill rolls, mainly:

  • According to the product type, there is a steel roller, type steel roll, wire roll, etc.
  • Press the roll in the roll series in the mill series, there is a blank roll, a thick roll, and a finishing roll or the like;
  • Press the rolling function to divide the roller, perforated roll, flat roller, etc.
  • According to the roll material, steel rolls(High-Speed Steel Rolls), cast iron rolls, Tungsten Carbide Rolls, ceramic rolls, etc.
  • According to the manufacturing method, there is a cast roll, forged rolling roller, a stainless rolling roll, a set roll, etc.
  • Press the rolled steel state with a Hot Mill Roll and Cold Mill Roll.
  • Various classifications can be combined to make the rolls more clear, such as hot-rolled steel for centrifugal steel working rolls.
How to choose mill rolls?2021-09-28T07:38:57+00:00

The performance and quality of the rolls generally depend on their chemical composition and manufacturing and can be assessed by their metallographic tissue, physical and mechanical properties, and residual stress type present in the mill roll.

The use effect of mill rolls in the mill is not only dependent on the material of the roll and its metallurgical quality, and it is also related to the conditions, roll design, and operation maintenance.
There is a big difference in the use conditions of rolls of different types of mills, resulting in differences:

  • Rolling mill conditions. Such as rolling mills, rolling mills, and mill rolls design, hole design, water-cooled conditions, etc.
  • Rolling conditions such as rolling products, specifications, and deformation resistance, depression systems, and temperature systems, yield requirements, and operations.
  • Requirements for product quality and surface quality.

Common mill rolls material and use table

Mill rolls category Mill rolls body hardness(HS) Mill rolls neck Strength (MPA) Applications
Cast steel mill rolls Cast steel
Semi-steel
Graphite steel
High-chromium steel
Tool steel (high carbon
High-speed steel)
30~70
35~70
35~60
70~80
80~90
500~1000
300~700
500~900
Large, medium-sized steel, roughing mill housing, slate rolling mill Roughing Mill Housing, BUR.
Big, medium, small steel middle, and finishing mill housing, slate steel WR.
Big, medium, and small steel roughing mill housing.
With steel coarse rolled horn, finished rolling front, cold-rolled strip work roller (WR).
Hot rolled steel finishing mill housing, small or wire Finishing mill housing.
Cast iron mill rolls Cold cast iron
Unbounded (limited) cold and hard cast iron
Ductile iron
High chromium cast iron
Special cast iron
55~85
55~85
35~80
60~95
75~95
150~220
150~220
300~700
Plate, wire, profile, pipe Finishing mill housing.
Plate, wire, profile, tube, rolled, finishing mill housing, slate steel finishing mill housing.
Profile, wire, pipe, medium rolling housing.
Small steel, wire rolling mill finishing mill housing, steel pre-finishing mill housing.
Small, wire, pipe pre-finishing mill, finishing mill.
Powder metallurgy mill rolls Tungsten carbide
Tool steel
80~90
80~90
Small, wire finishing mill housing, cold-rolled small steel.
Small, wire finishing mill housing, strip steel finishing mill housing.
Forged steel mill rolls Hot roll
Cold roll
BUR
Forging semi-steel and white mouth iron
35~60
75~105
40~70
35~70
500~1100
700~1400
700~1400
500~1000
Blooming mill, large thick rolling rack, steel Roughing mill housing
Cold rolled steel work roller, profile, welded pipe forming roller
Cold, hot plate strip rolling mill
Big, medium, small, medium, finishing mill housing

Note: The composite roller neck material is selected according to the strength requirements.

Therefore, different types of rolling mills and rolling mills are used in the same type, which requires no thunder, such as bullet and slab initial rolling rolls to have good twists and bend strength, toughness, bitterness, Anti-thermal cracking and thermal impact and wear resistance; and the tropical finishing rack requires high hardness, resistance, wear-resistant, anti-flakes and heat-resistant cracks such as roll surface.

To clarify the use conditions of the roll and the failure of the rolls used in the same type of rolling mill to understand the performance and manufacturing process of the current various rolls, in order to correctly formulate the technical conditions of the rolling mill and the selected suitable and economical roll material.
The most common method of evaluating the performance of the roll in the mill is:

  • Rolling the rolling weight (kg) (referred to as the roll consumption) consumed by the 1t rolling material, expressed by kg/t;
  • Reduce the weight of the rolled material per unit roll, expressed with t/mm.

With the modernization of the rolling mill, the in-depth study of the fading of the rolls and the improvement of roll materials and manufacturing processes, the average roll consumption of industrially developed countries has decreased below 1kg/t.

What are the performance requirements of the mill rolls?

  • Anti-thermal crack: Typically, the coarse roll is mainly required, and the thermal crack is mainly required; the working roll of the small 20 rolling mills is only 100 grams, while the weight of the support roller of the wide plate roller has exceeded 200 tons. When the roll is used, the safety-loaded body material (various levels of cast iron, cast steel or forged steel, or the like) is selected according to the basic strength of the roll.
  • Hardness: The finishing roller speed is high, and the final product of rolling should have a certain surface quality, which is mainly required to hardness, wear resistance, etc. The wear resistance should then be considered when the roll is used. Since the wear mechanism of the roll is complicated, including mechanical stress, the thermal action, cooling effect, the chemical effect of cooling effect, lubrication medium, and other effects, no comprehensive evaluation of the anti-wear resistance of the roll resistance. Since the hardness is easy to measure, and the wear resistance can be reflected under certain conditions, the wear-resistant indicator of the roll is generally expressed in the radial hardness curve.
  • Impact Resistance: In addition, there are some special requirements for the roll, such as the amount of pressure, which requires a strong bit bite ability, more impact.
  • Degree of finish: When the thin size product is rolled, the rigidity, tissue performance uniformity, processing accuracy, and surface finish of the roll are strictly required.
  • Cutting performance: When rolling the complex section, the cutting performance of the roller working layer is considered.
    When the roll is selected, some of the performance requirements of the roll often are opposite each other. The roll purchase fees and maintenance costs are very expensive, so we should fully weigh the techniques and economical pros and cons decided to cast or forged, alloys or non-alloys, Single material or composite.
How to classify metal cutting tools?2021-09-28T07:34:59+00:00

Metal cutting tools are classified according to cutting process:

  • Turning tools (including outer circle, inner hole, thread, cutting tool, etc.).
  • Drilling tools (including drill bit, reamer, tap, etc.).
  • Boring tool
  • Milling tools (including end milling, milling cutter inserts, welding edge milling cutter, etc.)
  • Solid carbide saw metal cutting.

The correct selection of cutting tools is an important content in machining technology. It not only affects the machining efficiency of machine tools, but also directly affects the machining quality.

How to correctly select metal cutting tools?

  • Choose a large cross-section size of the toolbar as much as possible, and a shorter length size to increase the strength and stiffness of the tool and reduce the vibration of the tool.
  • Select a larger main deflection angle (greater than 75, close to 90 °); The tool with negative edge inclination is selected for rough machining and the tool with positive edge inclination is selected for finish machining.
  • Uncoated blade and small tip arc radius shall be selected during finishing.
  • Choose standardized and serial tools as much as possible.
  • Select the correct toolbar and tool handle for quick clamping.
What is a cemented carbide hot melt drill bit?2021-09-28T07:29:16+00:00

Hot melt drilling technology (Fdrill) is a chip-free processing technology for machining holes and bushes on thin metal sheet or tube, which completely replaces the process of welding (riveting) nuts on thin-walled workpieces. The hot melt drill is made of wear-resistant and high-temperature resistant cemented carbide material.
Application industry:

  • Automobile industry
  • Bicycle industry
  • Stainless steel furniture
  • Aerospace
  • Central heater

Hot melt drilling technology

When the tool and workpiece are in contact, high speed (1000~3500) and proper axial thrust (feed force) cause awesome friction between the drill and metal, reaching 650 centigrade instantly. °~ seven hundred and fifty ° The temperature of the temperature. The metal near the bit softens rapidly, and then axial pressure is applied to extrude the boss and bushing about three times the thickness of the initial plate on the upper and lower surfaces of the workpiece.

The whole process only takes 2-6 seconds. For the machining of smooth connecting surface or chamfering hole, plane drill can be used to cut the boss formed on the surface of the workpiece. The bushing can be used as bearing support, branch throat welding joint, etc., and can also be tapped for threaded connection. The thread is formed by rolling, and the processed thread can bear higher tension and torsion.

The chip-free drilling technology is suitable for processing ordinary steel, stainless steel, aluminum, copper, and other workpieces with ductility, as well as electroplated workpieces. It can be used for manual bench drill or CNC machine tools, the required power is 1.5 ~ 3.5kw, and the spindle speed is 1000 ~ 3500r / min. According to the different hole diameter, workpiece material and thickness, the selected cutting parameters are also different. Advantages: high efficiency, economy, saving materials, and the processed workpiece is more beautiful.

Advantages of hot melt drill

  • No chip, the thread can bear tension and torque
  • No chip processing, no need to remove the waste.
  • High forming precision on boss.
  • Suitable for various tapping machines.
  • High speed, long life and high production efficiency.
  • Suitable for a variety of hot-melt drilling materials.

 

Suitable for the following occasions:

  • Thread extension required
  • Multi layer heat exchanger
  • Bearing support
  • Screw connection of stainless steel building or metal furniture

Hot drill purchase guide

According to the thickness of the workpiece to be drilled, there are two length specifications of the hot drill:

  • Short drill: suitable for penetrating workpieces with thickness of 0.8mm-3mm.
  • Long drill: used for penetrating workpiece with thickness greater than 3mm – 12mm.

According to the surface requirements of the workpiece after penetration by the hot drill, there are two specifications of the hot drill:

  • Standard hot drill: the hot drill forms a convex ring on the surface of the workpiece while penetrating the workpiece to draw the forming bush.
  • Flat hot drill: the hot drill cuts off the convex ring on the surface of the workpiece when it penetrates the workpiece and stretches to form a bush, so that the surface of the workpiece is smooth.
  • For drilling stainless steel, the diameter of screw thread is M8 or above, the diameter of hot drill should be 0.1mm larger and the drilling speed should be reduced by 10-20%. For drilling non-ferrous metal, the drilling speed should be increased by 50%.
What is carbide end mill?2021-09-28T06:56:36+00:00

Carbide endmill is an industrial rotating cutting tool that can be used for milling operations, which is made from tungsten carbide (WC) and cobalt (Co) materials. They are also commonly referred to as a “carbide milling bit”. Center cutting end mill can be used for plunging operations (axial milling), and can also be used in side milling operations (radial milling). Non-center cutting bits may only be used in side milling applications.
The most common material used for end mills is tungsten carbide, but HSS (high speed steel) and Cobalt (high speed steel with cobalt as an alloy) are also available.

What is aluminum high-speed steel (HSS-Al)?2021-09-28T06:55:28+00:00

Aluminum-containing high-speed steel (HSS-Al) is smelted by a method of carbon (Al) elements based on molybdenum high-speed steel and is designed to increase thermal hardness and wear resistance.

The performance of the aluminum-containing high-speed steel is similar to the cobalt-containing ultra-hard high-speed steel, the hardness of the heat treatment is HRC67 ~ 69, the anti-bending strength is 290 kg / square millimeters, the impact value is 2.3~3kg 1m/cm² The high-temperature hardness at 600°C is HRC54~55.

Aluminum-containing high-speed steel (HSS-Al) forging performance and excellent cutting performance, but grinding performance is lower than normal high-speed steel when grinding with white jade wheels, and superior to high-speed steel and high vanadium high-speed steel and high vanadium Cobalt high-speed steel.

The durability of the HSS-Al tool is similar to the cobalt-containing ultra-hard high-speed steel, 1 to 2 times higher than the ordinary high-speed steel, up to 3 to 4 times.

What is the work area structure of the drawing dies and function?2021-09-28T06:53:56+00:00
Structure of the wire drawing dies core

The structure of the wire drawing dies core can be divided into five sections according to the nature of the work:

  • Bell Radius: It is convenient to thread and prevents the wire from scratching the drawing dies from the entrance direction.
  • Entrance Angle: Through it, the steel wire can be easily brought into the lubricant.
  • Approach Angle: The main part of the die hole, where the deformation process of the steel wire is carried out, that is, the original section is reduced to the required section size.
  • Land: Its function is to obtain the exact size of the drawn wire.
  • Back Relief: Used to prevent the steel wire from being unsteady and scratching the surface of the steel wire.

The inner diameter profile of the drawing dies is very important, it determines the tension which is required to compress the wire and affects the residual stress in the wire after drawing.

With the increase of the wire drawing speed, the service life of the wire drawing dies has become a prominent problem. Americans T Maxwall and E G Kennth proposed a new wire drawing dies hole pattern theory suitable for high-speed wire drawing, that is, the “straight line” theory. The wire drawing dies made according to this theory has the following characteristics:

  • The entrance area and lubrication area are combined into one, which has a tendency to reduce the lubrication angle so that the lubricant is subjected to a certain pressure before entering the working area, so as to achieve a better lubrication effect.
  • The entrance area and working area are lengthened to establish a better lubrication pressure, and the angles are optimized according to the drawing material and the compression rate of each pass.
  • The sizing area must be straight and reasonable in length.
  • The vertical line of each part must be straight.
What are the types of core materials for drawing dies?2021-09-28T06:51:32+00:00

The wire drawing die industry has experienced decades of development, and many new core materials for wire drawing dies have emerged.

According to the types of materials, the wire drawing dies can be divided into alloy steel dies, tungsten carbide dies, natural diamond dies, polycrystalline diamond dies, CVD diamond dies and ceramic dies.

The development of new materials greatly enriches the application range of the wire drawing die and increases the service life of the wire drawing die.

Comparison of the advantages and disadvantages of various drawing die materials:

Drawing dies material Advantage Disadvantage Application
Alloy steel drawing dies Easy to make Poor wear resistance and short life Basically eliminated
Natural diamond drawing dies (ND Drawing Dies) High hardness and good wear resistance Brittle and difficult to process Used to manufacture wire drawing die cores with a diameter of less than 1.2mm
Tungsten carbide drawing dies (TC Drawing Dies) Good polishability and low energy consumption Poor wear resistance and difficult processing Various diameter wires
Polycrystalline synthetic diamond drawing dies (PCD Drawing Dies) High hardness and good wear resistance Difficulty in processing and high cost Small wire, metal wire
CVD coating material drawing dies (CVD Drawing Dies) High finish, good temperature resistance Complex process, difficult to process
Ceramic material drawing dies Wear resistance, high temperature resistance, good corrosion resistance Thermal shock, poor toughness, difficult processing No large-scale application
I want to draw low carbon steel wire, do you have any recommendation?2021-09-28T06:49:40+00:00

Carbide drawing dies grade YG6 is for drawing low carbon steel wire, YG6X is drawing high carbon steel wire, and YG8 is suitable for both of them.

What type of drawing dies is recommended for wire diameter of 1.5 mm?2021-09-28T06:48:41+00:00

It is recommended to use wire drawing dies core 15*13mm, finished die core (NIB size) 15*13mm and steel sleeve (case size) 40*25MM.

Can the inner drawing dies hole of the nib be polished?2021-09-28T06:47:38+00:00

Yes,the tolerance of drawing dies hole size can range from 0mm to -0.02mm.

carbide blank dies
Finished carbide dies
What material is recommended for wire drawing dies steel sleeve?2021-09-28T06:41:57+00:00

For the steel sleeve of wire die, we recommend 45# Steel, or we can accept customization.

What are the differences between T.C drawing dies and PCD drawing dies?2021-09-28T06:40:57+00:00

T.C drawing dies are made from tungsten carbide,PCD drawing dies are made from Polycrystalline Diamond. The life span of PCD is 10 times longer than T.C drawing die, and PCD drawing dies are more expensive than T.C drawing dies.

What kind of wire drawing powder do you have?2021-09-28T06:40:03+00:00

UKO offer sodium based series and calcium based series wire die products.

What’s your minimum quantity of an order?2021-09-28T06:39:06+00:00

Our drawing powder is the minimum order quantity(MOQ) is 1ton.

Why is tungsten carbide cold heading die performance better?2021-10-16T03:52:25+00:00

In the standard parts industry, tungsten carbide cold heading dies to need to under great unit pressure in cold upsetting deformation process, when a large degree of deformation and material hardness, units of pressure up to 2000MPa more.

At the same time the metal flow intense, thus requiring tungsten carbide cold heading dies to have high strength, high hardness, and good fatigue resistance, in order to ensure the cold heading dies under high pressure without breaking, deformation, and wear resistance. Tungsten carbide cold heading dies raw material is produced by powder metallurgy composite materials, which have high hardness, wear resistance, life is several times and several hundred times than ordinary cold heading die.

With carbide manufacturing standard tungsten carbide cold heading die, not only have high dimensional accuracy of parts but also greatly improve the life of the cold heading die, can create good economic and social benefits.

What is the meaning of CCMT060204HQ code of CNC turning tools?2021-09-28T06:33:34+00:00

C: Knife tip angle 80 °
C: The rear angle is 7 °
M: Blade dimensional tolerance (accuracy) code
T: The code of chip breaking and clamping form of the blade indicates that the cone screw of 40 ~ 60 degrees is compressed.
06: The cutting edge length is 6mm.
02: The blade thickness is 2.38mm.
04: Tooltip radius is R0.4.
HQ: Chip breaking groove type code.

What’s the difference between diamond blade and parallelogram blade in CNC turning tools?2021-09-28T06:32:30+00:00

The differences between D-type 50° diamond and C-type 80° diamond CNC turning tools are as follows:

The larger the sharp angle of CNC turning tool, the better the strength of the blade tip, the better the heat dissipation, the more suitable for heavy cutting, and the smaller the secondary deflection angle, which is conducive to improving the machined surface roughness.

D-type tooltip angle is relatively small, which can reduce the contact area between the tooltip and the workpiece during cutting, reduce the cutting force, and help to control the machining accuracy.

In addition, the C-type blade angle determines that it is suitable for both the outer circle and the end face, and has a wide range of uses. Type D is suitable for finishing or semi-finishing excircle and digging a certain range of grooves, but it is not suitable for flat end face (only small cutting depth).

Generally speaking, type C is widely used and everyone loves it. Similar to C-type, W-type (peach type) has double-sided 6 tips, but the angle is the same as C-type, which can reduce the cost.

What are CNC milling tools?2021-09-28T06:30:38+00:00

CNC milling tools is a rotary cutter with one or more cutter teeth, which is used for milling by CNC machine. During operation, each cutter tooth cuts off the metal allowance of the workpiece intermittently in turn.

How to classify CNC milling cutters?

A. According to the materials used to manufacture milling cutters, they can be divided into:

  • High-speed steel cutting tools.
  • Cemented carbide cutting tools.
  • Diamond cutting tools.
  • Other material cutting tools, such as cubic boron nitride cutting tools, ceramic cutting tools, etc.

B. According to the different structures of milling cutter, it can be divided into:

  • Integral type: the tool and handle are made into one.
  • Inlay type: it can be divided into welding type and machine clamp type.
  • Vibration damping type when the ratio of the working arm length and diameter of the tool is large, this kind of tool is often used in order to reduce the vibration of the tool and improve the machining accuracy.
  • Internal cooling type: cutting fluid is sprayed to the cutting edge of the tool through the nozzle hole inside the tool body.
  • Special types: such as compound tools, reversible thread tapping tools, etc.

C. According to the different structures of milling cutter, it can be divided into:

  • Face milling cutter (also known as end milling cutter): there are cutting edges on the circumferential surface and end face of the face milling cutter, and the end cutting edge is the auxiliary cutting edge. The face milling cutter is mostly made into sleeve gear insert structure and indexable structure of blade clamp. The cutter teeth are made of high-speed steel or cemented carbide, and the cutter body is 40Cr. Drilling tools, including drill bits, reamers, taps, etc;
  • Die milling cutter: die milling cutter is developed from end milling cutter. It can be divided into conical end milling cutter, cylindrical ball end milling cutter and conical ball-end milling cutter. Its handle has straight handle, flattened straight handle and Morse taper handle. Its structural feature is that the ball head or end face is full of cutting edges, and the circumferential edge is connected with the ball head edge in an arc, which can feed radially and axially. The working part of the milling cutter is made of high-speed steel or cemented carbide. Aluminum spot welder
  • Keyway milling cutter: used for milling keyway.
  • Forming milling cutter: the cutting edge is consistent with the shape of the surface to be machined.
What is CNC lathe machine?2021-09-28T06:27:43+00:00

CNC lathe machine is an automatic lathe machine equipped with a program control system. The control system can logically process the program with control code or other symbolic instructions and decode it, so as to make the machine tool operation and process parts.

Compared with an ordinary lathe machine, CNC lathe machine have the following characteristics:

  • High processing precision and stable processing quality;
  • It can carry out multi coordinate linkage and process parts with complex shapes;
  • When processing parts are changed, generally only the NC program needs to be changed, which can save production preparation time;
  • The machine tool itself has high precision and rigidity, can select favorable processing amount and high productivity (generally 3 ~ 5 times that of ordinary machine tools);
  • The machine tool has a high degree of automation, which can reduce the labor intensity;
  • Higher quality requirements for operators and higher technical requirements for maintenance personnel.

CNC lathe machines are generally composed of the following parts:

  • Host, which is the subject of CNC machine tools, including machine body, column, spindle, feed mechanism and other mechanical parts. It is a mechanical part used to complete various cutting processes.
  • NC device is the core of NC machine tool, including hardware (printed circuit board, CRT display, key box, paper tape reader, etc.) and corresponding software. It is used to input digital part program, complete input information storage, data transformation, interpolation operation and realize various control functions.
  • The driving device, which is the driving part of the actuator of NC machine tool, including spindle driving unit, feed unit, spindle motor and feeds motor. He realizes spindle and feeds drive through electrical or electro-hydraulic servo system under the control of NC device. When several feeds are linked, the machining of positioning, straight line, plane curve and space curve can be completed.
  • Auxiliary devices, some necessary supporting parts of index control machine tool, to ensure the operation of NC lathe machine, such as cooling, chip removal, lubrication, lighting, monitoring, etc. It includes hydraulic and pneumatic devices, chip removal devices, exchange worktables, CNC turntables and CNC indexing heads, as well as CNC inserts and monitoring and detection devices.
Which carbide inserts are suitable for face milling?2021-09-28T06:26:02+00:00

Our fast feed milling inserts are very suitable for face milling, including SDMT, SNMU, WNMU, LNMG, HNMG.

Do you have the cutting parameters for the SDMT120512 face milling insert?2021-09-28T06:24:48+00:00

The feed is about 4000mm/min, the ap=0.8-1.0mm. The cutting parameters is just for reference. The specific processing parameters should be comprehensively determined according to working conditions, milling machine types, processing materials, etc.

What is the use of the carbide descaling roller?2021-09-28T06:21:51+00:00
  • Quality improvement and plant efficiency through Descaling Roller effective descaling. Regarding Steel Wire Straightening Machine, the Steel Wire quality of them depends to a large extent on Wire Descaling effective descaling.
  • Therefore, the selection of the best carbide descaling roller in the process is a key factor. At the same time, this enables potential energy savings to be realized, which counteract Steel Wire Manufacturers rising energy costs or result from ecological considerations.
Tetraoxide three iron chemical formula

Why remove the oxide skin on the surface of the steel bar?

When the steel bar is out of the steelmaking furnace, under the condition of high temperature of 300-900℃, Fe₃O₄ oxide will form on the surface of the steel bar, which is a kind of oxide scale, which is a compound produced by the hot-rolled steel bar in contact with oxygen in the air during the cooling process.

Its existence will reduce the gripping force of the concrete on the ribbed rebar, which seriously affects the quality and safety of the project. Therefore, it must be thoroughly removed by a Carbide Descaling Roller before the cold rolling process of the steel bar to ensure the quality of the subsequent steel bar rolling.

What is the helix angel of the flutes of the ball nose end mills?2021-09-28T04:03:15+00:00

Ball nose end mill helix angle is 35 degrees.

What are DLC coated end mills advantages?2021-09-28T03:58:42+00:00
  • DLC coating ensures the wear resistance and stability of the tool in the process of large feed and large cutting.
  • High-strength anti-vibration, no sticking to the knife, so that the surface of the workpiece is smooth.
  • Unique U-groove design reduces cutting resistance and improves work efficiency.
  • It can help reducing the number of tool changes and the breakdown utilization rate, saving production time.
Can DLC coating end mills be used to process steel?2021-09-28T03:57:48+00:00

This material can be used for processing steel parts, but it is not recommended to be used for processing steel. Insufficient performance, DLC coating is mainly used for copper and aluminum.

DLC milling cutter has obvious advantages in machining Al, Ti and their composites.

Can APMT1135 be used for face milling?2021-09-28T03:48:04+00:00

APMT1135 and APMT1604 milling inserts is belong to shoulder milling inserts, which can be used for shoulder milling, face milling.

Material Processing mode Cutting speed / (m/min) Feed rate / (mm/r) Back cutting amount/mm
Silicon aluminum alloy (w (Si)<13%) Milling 500-3000 0.10-0.30mm/tooth 0.10-3.0
Silicon aluminum alloy (w (Si)>13%) Milling 200-1500 0.10-0.30mm/tooth 0.10-3.0

APMT1135 is generally used for cast aluminum and deformed aluminum.

The cutting parameters of cast aluminum are generally selected according to the content of silicon.

Deformed aluminum alloy has high plasticity and low hardness. The small elastic modulus makes the contact flow and bonding between chips and tools in cutting. The basic requirements for tools are: sharp cutting edge, small blunt circle radius, large positive rake angle, large rear angle and small tool surface roughness.

PCD knife has smooth surface, small friction coefficient with various materials, small affinity with aluminum, difficult to bond and react chemically, and small diamond particle size is selected. It can grind a sharp edge.

PCD cutting edge rake angle R ≥ 0-10 а 0 ≥ 7-20 common edge geometric parameters of tool tip, tool tip rake angle R0 = 0, 10 tool tip rake angle а 0=7、11、20。 Tool tip arc radius r ω= 0.05mm、0.1mm、0.2mm、0.4mm、0.8mm、1.2mm。

What’s the difference between 2/3/4 flutes of solid carbide endmills?2021-09-28T03:30:23+00:00
  • 2 cutting edge chip is discharged smoothly, the longitudinal feed processing is easy, and the rigidity is low. It is widely used for grooving, side processing and hole processing.
  • 3 cutting edge chip is discharged smoothly, the longitudinal feed processing is easy, and the outer diameter measurement is difficult. It is used for groove, side processing, re milling and finishing.
  • 4 cutting edge is rigid and the chip discharge is not smooth. It is used for shallow groove, side machining and finishing.
What is helix angle for 60hrc end mills?2021-09-28T03:26:13+00:00

The end milling cutter depends on the feed direction, feed along the axis (I call vertical milling) and perpendicular to the axis (I call transverse milling). The main deflection angle is different, which is mainly due to the different main cutting edges.

The most commonly used end milling cutter is transverse milling. At this time, the circumferential edge is the main cutting edge, and the included angle between it and the projection of the feed direction on the base plane (the plane composed of the point you analyze and the milling cutter axis) is the main deflection angle (note the projection).

Generally, the helix angle mainly affects the blade angle.

Only 60 degrees is the helix angle of 45 degrees, and the rest are all 35 degrees.

What’s the advantage of 45-degree helix angle than 35 degrees of solid carbide endmills?2021-09-28T03:07:41+00:00
45degree helix angle than 35 degrees of solid carbide endmills

Tungsten steel end milling cutter is also called cemented carbide end milling cutter. The hardness of the cutter itself is generally between hra88-96 degrees.

However, the finished tool is generally called by the hardness of the processed material: such as 45 degree end mill, 50 degree end mill, 60 degree end mill, 65 degree end mill and 70 degree end mill. The degree behind the number refers to the hardness of the processed material, and the unit is HRC Rockwell hardness, which also refers to the hardness that can be processed. 50 degree milling cutter can process HRC50 degree steel, such as S136 die steel.

The difference between them are life and finishing process. The higher the helix angle, the smoother the workpiece. But the lower the helix angle, the more durable, so the 35-degree life span is higher.

What’s the main purpose of HRC45 carbide endmills?2021-09-28T02:57:27+00:00

It is to process cast irons and needs to use 55 degrees for quenched workpiece.

What’s your HRC55 end mill application?2021-09-28T02:54:01+00:00

For processing steel material, such as 45# steel, die steel, P30, it the steel is quenched, then need to use HRC60 or HRC65.

What are the features of HRC60 end mills?2021-09-28T02:28:11+00:00

In order to meet the service requirements and durability of parts, heat treatment (quenching + tempering) is often used to greatly improve the rigidity, hardness, wear resistance, fatigue strength and toughness of steel. After heat treatment, the hardness of some steel parts reaches above HRC60, which is difficult to process. Traditional cemented carbide tools are difficult to solve. Some enterprises have just come into contact with such hard quenched steel parts. They don’t know what tools are suitable for processing. Many cemented carbide tools can’t achieve the ideal effect.

What tungsten steel milling cutter is more suitable for quenched steel parts above HRC60?

Firstly, in the process of machining quenched steel parts above HRC60, the hardness of the tool itself must be higher than that of the quenched steel parts, and such workpieces are more high-precision parts, such as molds and ball screws, which have high requirements for surface quality. Therefore, at present, the tool materials for machining quenched steel parts above HRC60 are mainly cubic boron nitride (PCBN) tools. Cubic boron nitride (PCBN) cutting tools are divided into integral type and welding type, and the welding type is divided into through welding cubic boron nitride cutting tools and composite PCBN cutting tools.

How to select tool materials to process quenched steel parts?

Reasonable selection of tool materials is an important condition for finishing quenched steel. According to the cutting characteristics of quenched steel, tool materials should not only have high hardness, wear-resistance and heat resistance but also have a certain strength and thermal conductivity. The hardness of cemented carbide tools is 89-94hra, which is equivalent to 71-76hrc. When machining quenched steel above hrc40, cemented carbide blades are easy to burn and cause wear blocks, and the machining efficiency is low. Therefore, it is suitable for the finishing of workpieces with hardness below hrc45. Relatively speaking, it needs low-speed turning (if it is a single piece of occasional finishing production, it can also be processed with ordinary cemented carbide tools of the appropriate brand).

Generally, it is selected according to the machining allowance and the rigidity of the processing system. In general, AP = 0.1 ~ 3M. At present, the bn-s10 developed for cutting quenched steel with a large amount of surplus has a cutting depth of 7-10mm. For the deformed workpiece after quenching, the machining allowance of quenched steel is difficult to control and needs annealing and re processing, satisfactory tool selection is given, which changes the inherent machining process of quenched steel; The feed rate is generally 0.05 ~ 0.4 mm / R. In case of high hardness of workpiece material or intermittent cutting, in order to reduce the unit cutting force, the feed rate should be reduced to prevent edge collapse and tool beating; For the selection of machining feed, KHC tungsten steel milling cutter suggests to select the tool angle according to the shape and size of the workpiece, which can improve the machining efficiency and effectively improve the service life of the tool.

What is the difference between the end mill and face milling cutter?2021-09-28T02:18:23+00:00

“Face milling cutter”, also known as disk milling cutter, is used to process plane on vertical milling machine, end milling machine or gantry milling machine. There are cutter teeth on the end face and circumference, as well as coarse teeth and fine teeth. There are three types of structures: integral type, inlaid type and indexable type.

“End milling cutter” is mainly used to process grooves and step surfaces. The cutter teeth are on the circumference and end face, and cannot be fed along the axial direction during operation. When the end milling cutter has end teeth passing through the center, it can be fed axially. This is the difference between the two.

The end mill has a large edge-to-diameter ratio, it can process a deeper cavity, the cutting parameters are low, and the tool is easy to vibrate.

The face milling cutter has a small edge-to-diameter ratio and is used to process large surfaces of workpiece. It has high parameters and good tool rigidity, which is not easy to vibrate.

Why can’t the end mill be cut vertically?2021-09-28T02:14:58+00:00

End mills may not be able to cut vertically. Only an end mill with a center edge can be cut vertically, but this processing method is rarely used. Because the midpoint of the bottom edge of the end mill is relatively static when it rotates, it does not have any cutting and chip removal properties, and it is easy to cause the end mill to break.

The ordinary taper shank end milling cutter is mainly used for transverse milling. The main part of its cutting is on the side edge of the circumference of the end milling cutter. The center of its end tooth has a center hole and cannot feed down vertically. The function of the end tooth is only to sweep the bottom surface; The main function of the keyway milling cutter is to mill the keyway. There is no central hole in the center of the end tooth of the keyway milling cutter, and the cutting edge of the end tooth of the keyway milling cutter is a positive rake angle, so that when milling the keyway, the cutter can directly feed down without the fitter drilling the tool hole again.

What is the difference between a square end mill and a ball nose end mill?2021-09-28T02:08:54+00:00
  • End milling cutter and ball end milling cutter, one is ball end and the other is flat bottom. End milling cutter is mainly for conventional processing, and ball end milling cutter can be used to mill curved surface, etc.
  • The end milling cutter is generally used for milling the end face, not for milling the groove. The keyway cutter shall be used for milling the groove. Disk milling cutter is mainly used for milling large end faces, because the straight longitude of disk milling cutter is generally large, milling large end faces is faster, and saw blade milling cutter is generally used for milling.
  • When the end milling cutter rotates, the midpoint of its bottom edge is relatively static and does not have any cutting and chip removal, so it can not cut vertically.
  • The square end mills usually use side edge removal margin, the cutting depth is generally 1D (equivalent to the cutting diameter), and the cutting width can also reach 0.25D. The ball nose end mill is used for profiling, and the cutting depth and width are less than 0.1D.
What’s the difference between reamers and end mills?2021-09-28T02:10:27+00:00
  • Reamer is straight edge, end mill is a spiral edge.
  • Milling cutter has a bottom edge, but a reamer has no bottom edge.
  • Reamers are used to finish holes, while milling cutters can mill surfaces, grooves and side milling for different purposes.
  • The blade of the reamer is short and the neck is long, so it looks like a long dumbbell.
  • The cutter teeth of the end mill are relatively long, accounting for 1 / 2 ~ 2 / 3 of the overall length of the cutter. The neck is very short. The cutter teeth are spiral, and the number of teeth is relatively small, which looks very sharp.
How to use end mills for shoulder milling?2021-09-28T02:09:47+00:00

What is shoulder milling?

Shoulder milling processes two surfaces at the same time, which requires the combination of circumferential milling and surface milling. Machining a true 90 ° shoulder is one of the most important requirements. Traditional shoulder milling, vertical milling, long edge milling and three face milling can be used for shoulder milling. Because there are many options, the requirements of the process must be carefully considered in order to make an appropriate choice.

Milling cutter selection:

Traditionally designed shoulder milling cutters can usually mill real 90 degree shallow shoulders. Many shoulder milling cutters are universal milling cutters, which can be conveniently used for hole machining. When milling a vertical face or near a vertical face, they are ideal alternatives to face milling cutters.

  • End milling cutter: Indexable inserts and integral carbide end mills provide an ideal solution for square shoulder machining requiring accessibility.
  • Long edge milling cutter: Long edge milling cutters are usually used to mill deep square shoulders.

How to apply square shoulder milling?

  • Shallow shoulder milling: This common process is usually performed by shoulder and end mills. Small cutting depth can achieve larger cutting width. These milling cutters can usually replace face milling cutters, especially when the axial pressure for parts becomes a limiting condition, and when there are requirements for the accessibility of vertical surfaces or fixtures. The large size of shoulder milling cutter can ensure good accessibility when it is located at the deep shallow shoulder.
  • Deep square shoulder milling: Repeat with shoulder milling cutter and end milling cutter. In order to minimize surface tools, such as blade overlap and double tool overlap, it is important to use high-precision tools that can process a true 90 ° shoulder. If the shoulder depth is less than 75% of the cutting edge length, the quality of the vertical surface usually does not need to be finished.
What is tungsten carbide?2021-09-27T08:24:50+00:00

Tungsten carbide is a compound composed of tungsten and carbon, the molecular formula is Wc, and the molecular weight is 195.85, tungsten carbide is a black hexagonal crystal, with metal gloss, hardness is similar to diamond, for electricity, and hot conductors. Tungsten carbide is insoluble in water, hydrochloric acid, and sulfuric acid, soluble in mixed acids of nitric acid-hydrofluoric acid. Pure tungsten carbide is fragile, if a small amount of titanium, cobalt is incorporated, it can reduce brittleness.

Tungsten carbide used as steel cutting tools often adds titanium carbide, tantalum carbide, or mixtures thereof to improve explosion resistance. The chemical properties of tungsten carbide are stable. Tungsten carbide powder is applied to cemented carbide production materials.

Name Chemical formula Molecular weight CAS number EINECS number Melting point MDL number
Tungsten Carbide WC 195.85 12070-12-1 235-123-0 2870℃ MFCD00011464
Boiling point Water solubility Density Appearance Security description Resistivity
6000℃ no 15.63g/cm³ Black hexagonal crystal with metallic luster S22,S24/25 19.2×10-6Ω·cm

Content

  1. Brief history
  2. Physical and chemical properties
    ▪ Physical properties
    ▪ Chemical properties
  3. Production method
  4. Application field
  5. Precautions
  6. Storage and transportation
  7. Safety information
    ▪ Safe terminology
    ▪ Risk terminology

Brief history

Since 1893, German scientists have removed tungsten carbide by using tridete and carbon to heat to high temperatures and attempt to use their high melting point, high hardness and other characteristics to substitute a diamond material. . However, industrial applications have been unable to obtain industrial applications due to the criticism of tungsten carbide, easy to crack and toughness.

In the 1920s, German scientist Karl Schroter found that pure tungsten carbide can not be adapted to the fierce stress changes formed during the draw, only the low melting point metal is added to the WC to make the blank without reducing the hardness. Has a certain toughness. Schroter first proposed a method of powder metallurgy in 1923, to mix tungsten carbide and a small amount of ferrous metal (iron, nickel, cobalt), then press molding and sintering over hydrogen at a temperature above 1300 ° C, Sintering. Patent.

Physical and chemical properties

Physical nature

Microhardness Elastic Modulus Compressive strength Thermal expansion coefficient
17 300 MPa 710GPa 56MP 6.9×10-6/K

 

Crystallize the black hexagonal crystal system. Soluble in alfluenzaic acid and hydrofluoric acid mixed with hydrofluoric acid, insoluble in cold water.

Gray with metal glossy powder. It belongs to the hexafang crystal system. Very hard, the elasticity is also large (72700kg / mm2).
Tungsten carbide powder particle size:

Chemical nature

The air is activated and oxidized, and the antioxidant capacity is weak.
Strong acid resistance.
Chemical Reaction: W + C = WC Note: Reaction at 1150°C.
It is less than 400°C without chlorine; at room temperature to be fiercely reacted with fluorine; oxidized into tungsten oxide when heated in air.

Tungsten carbide molecular formula

Production method

The metal tungsten and carbon are raw materials, and the average particle diameter of 3 to 5 μm is dry mixed with a carbon black ball mill, after sufficiently mixing, press molding and placed in graphite disc, then in graphite resistance furnace Or heating from 1400 to 1700℃ in the induction electric furnace, preferably 1550 to 1650℃.

In the hydrogen stream, W₂C was initially formed and continued to react at high temperatures to generate WC. Alternatively, hexacarbonyl tungsten is first decomposed in 650 to 1000℃, and the tungsten powder is thermally decomposed in the CO atmosphere, and then the WC is obtained from the carbon monoxide at 1150℃, and the temperature is higher than the temperature. W₂C.

Tungsten carbide metallographic

Chemical reaction:

2W + C = W₂C
W + C = WC

The tungsten oxide WO₃ hydrotreated was reduced to prepare tungsten powder (average particle size 3 to 5μm). The tungsten powder is then pressing the mixture of the carbon black (mixed with a ball mill drying by a ball mill), and press molding at a pressure of around 1T / cm². The pressurized molded block is placed in a graphite disc or a crucible, and the graphite resistance furnace or the induction electric furnace is heated to 1400 to 1700℃ (preferably 1550 to 1650) with a graphite resistance furnace or induction electric furnace (pure hydrogen using a dew point of -35℃) (preferably 1550 to 1650)℃) so that the carbon is carburized to form a WC.

The reaction begins around tungsten particles because W₂C is generated in the initial stage of the reaction, since the reaction is not complete (mainly low in reaction temperature), except for unreacted W and intermediate product W₂C in addition to the WC. Therefore, it must be heated to the above high temperature. The highest temperature should be determined according to the size of the raw material tungs. If the average particle size is between 150μm, the reaction is carried out at a high temperature of 1550 to 1650℃.

Chemical reaction:

WO₃ + 3H₂ → W + 3H₂O
2WO₃ + 3C → 2W + 3CO₂
2W + C = W₂C
W + C = WC

The carbon tungsten carbide WC particle size is used according to the hard alloy of different purposes, using different particle size tungsten carbide; hard alloy cutter, such as cutting machine blade V-CUT knives, finishing alloy adopts superfine Dine particle tungsten carbide; coarse processing alloy adopts medium-granulated tungsten carbide; alloys in gravity cutting and heavy cutting of coarse particles do raw materials; mine tool rock hardness high impact load is large with crude particulate tungsten carbide; rock impact small impact load Small, using medium particulate tungsten carbide to do raw material wear parts; the Lord.

Tungsten carbide theory contains 6.128% (50% atom), and free carbonization (Wc + C) occurs in tungsten carbon tungsten carbon, and free carbon is sintered when carbonized carbon content is greater than the theoretical amount of carbon. The tungsten grain grew up, causing the hard alloy crystal grains uneven; tungsten carbonized carbon high (≥6.07%) free carbon (≤0.05%), the total carbon is determined in the production process and scope of use of cemented carbide.

Under normal circumstances, paraffin process vacuum sintered tungsten carbon tungsten carbon mainly decided that the compound oxygen content in the sintered front block contains a part of oxygen to increase by 0.75 parts of carbon, Tc total carbon = 6.13% + oxygen content% × 0.75 (assuming sinter In the furnace, the neutral atmosphere is actually the carbonized carbon tungsten carbon tungsten carbon tungsten carbon tungsten carbon carbon carbon carbon carbon atmosphere is less than the calculated value). China’s total carbon content is generally divided into three paraffinic process vacuum sintered with tungsten carbon tungsten carbon, about 6.18±0.03% (free carbon will increase) paraffin process hydrogen sintering tungsten carbonate total carbon content is 6.13 ± 0.03 % Rubber process hydrogen sintering Tungsten carbide total carbon = 5.90±0.03% The above process sometimes cross-proceeds, thus determining total carbon carbon tungsten carbon according to specific situations.

Different use ranges, different cobalt content, total carbon of WC used in different grain size alloys can do some small adjustments. Low cobalt alloy can be used for tungsten carbide of total carbon, and high cobalt alloy can be used for tungsten carbide with low carbon. In summary, the specific use requirements of the carbide use different requirements for tungsten tungsten tungsten particles.

CNC DLC coated end mill

Application field

  • Used as a tungsten carbide end mill, a tungsten carbide woodworking spiral cutter head, a high-speed cutting vehicle, a kiln structural material, a jet engine component, a metal-ceramic material, a resistance heating element, and the like.
  • For use in the manufacture of a cutting tool, a wear-resistant component, copper, cobalt, and a molten crucible, a wear semiconductor film.
  • Used as ultra-hard tool materials, wear-resistant materials. It can form solid solutions with many carbides. WC-TiC-Co hard alloy tool has been widely used. It can also be used as modified additives for NBC-C and TAC-C ternary systems, which can reduce sintering temperatures, and maintain excellent performance, and can be used as aerospace materials.
  • Tungsten carbide (WC) powder is synthesized with tungsten anhydride (WO₃) and graphite at a high temperature of 1400 to 1600°C in a reduced atmosphere. The dense ceramic article can be obtained by thermostat sintering or thermostatic sintering.

Precautions

Health hazard: tungsten dust can cause bronchial pericoronitis, fine branch tracheitis, latching fine bronchitis, and atrophic emblem. Tungsten carbide can cause hyperplasia reactions in lung lymphoid cells and gradually crash. The vessel wall thickened and uniform. In the work, the person who contacted tungsten carbide dust, the gastrointestinal dysfunction, the kidney was stimulated, and the upper respiratory tract appeared. The highest allowance concentration of tungsten carbide is 6mg/m³. The highest allowable concentration of 1mg/m³ in the US soluble tungsten compound (according to the tungsten meter), an insoluble tungsten compound (according to the tungsten meter) is 5mg /m³.

Carbide turning indexable

Safety:

Use a gas mask, dust uniform, gloves, glasses that meet the requirements. Dust leakage should be prevented at all stages of production. Workers must do physical examination before employment, check once a year. When there is obvious symptom of the upper respiratory tract, it is temporarily mobilized, detached from tungsten contact. When the pulmonary hardening or external respiratory is disordered, it should be lowered.

Storage and transportation

Storage: Storage in a cool, dry warehouse, pay attention to the packaging container in the transportation, rain and anti-Japanese light exposure.

Packaging Storage and Transportation: The product uses an iron barrel (plastic bucket), the lined polyethylene plastic bag sealing package, the net weight of each bag must not exceed 50kg. There should be “moisture-proof” and “up” and other words on the outer packaging bucket. The product should be stored in a cool, dry warehouse, pay attention to the packaging container in the transportation, rain and anti-Japanese light exposure.

Safety info

Security terminology

S22 Do not inhale the dust.
S24 / 25 AVOID Contact with Skin and Eyes.

Risk terminology

R23 is inhaled toxic.

  • Calculation reference value (XLOGP): NO
  • Hydrogen bond donor quantity: 0
  • The number of hydrogen bond receptors: 1
  • Can rotate chemical bonds: 0
  • The number of tautomers: no
  • Topological molecular polar surface area: 0
  • Heavy momentum quantum: 2
  • Surface charge: 0
  • Complexity: 10
  • Isotope atom: 0
  • Determine the number of atomic integers: 0
  • Uncertain Atomic Center Number: 0
  • Determine the number of chemical key structures: 0
  • Uncertain chemical key structure center quantity: 0
  • Number of covalent keys: 1
How to sharpen carbide lathe tools?2021-09-27T02:36:12+00:00

The grinding tool is a work that needs patience, time, skill and even talent. Even if the fixed angle grinder is used, it can only solve the problem of fixed angle (the most difficult technology in the grinding tool technique). However, all other requirements can not be less, and patience, time and correct operation method are still needed to grind out sharp and durable tools.

Whether it meets the technical needs of sharpening is the best standard to test the quality of the sharpener, not in terms of simplicity or complexity. The fast sharpener is the simplest, but its essence is scraping rather than grinding. The effect is very poor, the sharpness is close to rough grinding, and the retention is even worse.

 

Types of turning tools

Because of the consideration of efficiency and workers’ technical problems, large factories changed their cutting tools to machine clamping tools long ago, so it is difficult to see lathe workers sharpening tools. Some lathe workers even think that sharpening is very dirty and hard, and secretly change the cutting tools to machine clamping tools. I don’t know that this kind of replacement makes them lose the opportunity to practice their skills and deeply understand the cutting tools. If you don’t have the basic knowledge of tool understanding, then you can’t choose the right clamping tool and blade.

Turning tool grinding is a basic operation with high technical content in cutting. The operator needs to be familiar with the relevant theoretical knowledge and grinding principle, and master the grinding method and operation skills.

The posture and method of sharpening turning tool are as follows:

Posture and method of turning tool sharpening
  • People stand on the side of the grinder to prevent the fragments from flying out to hurt people when the grinding wheel is broken;
  • The distance between the two hands holding the knife is released, and the two elbows are clamped at the waist to reduce the shaking when grinding the knife;
    When grinding, the turning tool should be placed in the horizontal center of the grinding wheel, and the tip of the tool should be slightly upward for about 3 °~ 8°, When the turning tool contacts the grinding wheel, it should move horizontally in the left and right directions. When the turning tool leaves the grinding wheel, it should be lifted up to prevent the grinding edge from being damaged by the grinding wheel;
  • When grinding the flank, the end of the cutter bar is deflected to the left by an angle of main deflection angle; When grinding the flank of a pair, the end of the cutter bar is deflected to the right by an angle of a pair deflection angle;
  • When sharpening the arc of the tooltip, the front end of the tool is usually held by the left hand as the fulcrum, and the rear end of the tool is rotated by the right hand.

How to select the grinding wheel according to the material of the corresponding tool?

Name Tool material Advantage
White corundum grinding wheel It is suitable for common grinding of high-speed steel tools, quenched steel tools, etc. It is suitable for high hardness and dry grinding of high-speed steel, stainless steel and other workpieces which are easy to deform and burn.
Chrome corundum grinding wheel Suitable for steel, alloy steel, quenched steel internal grinding and forming grinding, tool grinding, profiling grinding, instrument parts precision grinding, high finish. White corundum-derived varieties, rose red, toughness, good grinding finish, good angle retention.
Single crystal corundum wheel It is suitable for high hardness and dry grinding of high-speed steel, stainless steel and other workpieces which are easy to deform and burn. It is of spherical multi-angular structure, yellow and white, with high hardness and toughness. Strong cutting force.
Where is the well known tungsten carbide manufacturer?2021-09-27T01:55:05+00:00

NO.1

Sandvik Coromant

Sandvik Coromant is the largest company of Sandvik Group with metal cutting tools as its main products. It has 73 subsidiaries or branches, 39 production bases, 3 central warehouses and 19 training centers in more than 60 countries, with a total of 7800 employees worldwide. Is the world’s leading supplier of metal cutting tools, but also tool solutions and professional processing knowledge provider.

In turning, Sandvik’s blade series covers a large number of blade types and materials, which can be used in all turning processes of different workpiece materials; In milling, it can provide unique tools for milling of various materials and types; In drilling, no matter what type of hole, it can provide high-performance bits with complete specifications for efficient production.

NO.2

Iscar

Iscar as one of the largest metal-cutting tool manufacturers in the world is one of the main subsidiaries of Berkshire Hathaway. The company was acquired by Mr. Buffett in 2006, before which it was Israel’s largest family business.

Iscar R & D, production, sales cutting, turning, milling, boring, drilling, hinge, tool handle system and other full range of tools, in aviation, steam turbine, automobile, mold, machine tools. Rich experience in providing a complete set of solutions for machine tool matching.

Ingersoll tool company of Germany, which joined Iscar, won the first milling cutter patent in the world in 1889, and initiated crankshaft turning, pulling external milling, and other machining tools. Ingersoll is also an active advocate and leader of blade vertical design.

NO.3

Seco tools

SECO Tools AB, one of the four largest cemented carbide tool manufacturers in the world, is listed on the Stockholm stock exchange in Sweden. Seco Tools company is a company that integrates research and development, production and sales of various kinds of carbide tools for metal processing. Its products are widely used in automobile, aerospace, generator equipment, mold, machinery manufacturing and other industries. It enjoys a global reputation and is known as the “king of milling”.

The company is famous for its series of milling and turning tools and blades. It is a professional enterprise integrating R & D, production and sales of various kinds of carbide tools for metal processing.

NO.4

Kyocera

Kyocera Co., Ltd., formerly known as Kyoto Ceramics Co., Ltd., is a Japanese multinational company founded by Kazuo Inamori on April 1, 1959.

The mechanical tools division of Kyocera (China) Trading Co., Ltd. is responsible for selling a full range of cemented carbide and cermet blades for industrial metal machining. Cutting tools are made of ceramic, CBN, synthetic diamond and other materials. Including a variety of standard turning blades, slitting blades, cutting blades, hole lining blades, multi-functional blades, thread blades, general drilling blades, special ultra-fine micro-drilling bits, plane milling, end milling and ball head milling and other indexable blades and their supporting tool holders, Spiral Cutter Head for Woodworking.

The products cover all kinds of standard and non-standard cutting tools needed in various fields such as automobile, mold processing, aerospace, rail transit, engineering machinery, energy, precision machining, etc.

NO.5

Walter company

Founded in 1919, Walter company is headquartered in Tubingen, southern Germany. So far, Walter company has 17 subsidiaries all over the world. Walter company mainly has two types of products: one is cemented carbide indexable tools, including turning, milling, drilling, expanding and boring tools and tool accessories. The other is Walter’s five-axis CNC tool grinder.

Walter company began to develop cemented carbide metal cutting tools in 1926. The founder Mr. Walter owns more than 200 patented technologies in this field. Today’s full range of cutting tools and indexable cutting toolsAnchor icon are widely used in automobile, aircraft and other manufacturing industries as well as various mechanical processing industries.

Walter has brought all the latest technical achievements in the past two years, including the precision internal cooling turning toolbar, the latest fm5, RM5 guide groove inserts, the latest design of blade type thread milling cutter t2711 / t2712, etc. At the same time, it also showed the latest blade technology of Walter tiger. tec gold blade technology for customers, so that customers can get a close understanding of the charm of the golden tiger.

NO.6

Sumitomo Electric

Sumitomo is one of the largest integrated tool manufacturers in Japan. More than 100 years of experience in tool manufacturing; Sumitomo provides all kinds of turning blades, milling inserts, Sumitomo turning arbors, milling arbors, Sumitomo cutting tools, Sumitomo cylindrical turning tools, Sumitomo inner hole boring tools, Sumitomo grooving tools including end face groove, outer circular groove, inner hole groove, and other grooving tools, Sumitomo solid carbide milling tools. Discarded milling cutter, cutter bar, blade, solid carbide bit, internal cooling bit, trans Soviet bit, etc.

Today’s Sumitomo products have been widely used in automobile, aerospace, shipbuilding, household appliances, and many other industries, especially its CBN and PCD tools, crankshaft milling tools, cemented carbide ZX coated drill bits and milling inserts and other products are famous in the world. In the aspect of face milling cutter, for example, the series of face milling cutter products for the plane processing of engine cylinder block and cylinder head adopts the tooltip reference type, dense tooth type, and quick-change mechanism, and can adopt high-speed feed, rough and finish machining, with rich classification and strong pertinence.

Sumitomo Electric new products include the new materials of stainless steel and steel parts turning, Sumitomo Electric’s superior products CBN series, slotting turning tool, expanding chip breaking groove, countersink drilling bit, m-grade blade, negative chip breaking groove, small diameter cutter head, high-efficiency milling cutter head, adhesive-free polycrystalline diamond, etc. For stainless steel turning, precision machining of small parts and other new products are launched.

NO.7

Dijet Industry Co.Ltd

Since its establishment in 1938, Dijet Industry Co., Ltd., as a professional cemented carbide manufacturer from raw powder to finished product, has been among the best in sales and popularity in Japan.

Dijet industrial products include all kinds of cemented carbide, ceramics, cermet, cubic boron nitride (CBN), polycrystalline diamond (PCD) and other materials, as well as all kinds of cutting tools, cemented carbide molds, special wear-resistant products, etc. Users throughout the automobile, motorcycle, machine tools, machinery manufacturing, mining, civil engineering, smelting, rolling, electronic and electrical industries, as well as other small and medium-sized tool manufacturing companies.

At present, there are 200 sets of high-precision CNC grinding equipment, more than 100 sets of CNC machining center, sintering furnace, molding machine and electric machining equipment, each with more than 50 sets. Six coating furnaces and three hip systems, etc.

NO.8

Mitsubishi materials

MITSUBISHI comprehensive materials, as a comprehensive material manufacturer, takes cement, aluminum, copper and processing industries as the pillars to provide advanced products, energy, high-performance materials and precious metals to the industrial society. Silicon products and other basic materials.

Mitsubishi integrated materials began to manufacture superhard tools under the name of “tridia” in 1931. The superhard products division produces cutting tools, wear-resistant tools and construction tools for turning, milling and drilling in Japan, and sells them to the global market, occupying the highest market share in China.

Mitsubishi integrated materials provide customers in the automotive and aircraft industries with indispensable parts processing superhard products and sintered parts as the core parts of engines, transmissions, etc.

NO.9

Kennametal

KENNAMETAL was founded in 1938. At that time, Philip M. McKenna, an American metallurgist, invented a new tool material of tungsten titanium alloy after years of painstaking research, which could improve the machining efficiency of cutting steel. Based on this invention, Philip founded McKenna metals in Latrobe, Pennsylvania.

Kennametal’s cutting tool products were widely used in the wartime economy. After World War II, Kennametal began to research and develop cemented carbide materials with better toughness and wear resistance. In the mid-1940s, Kenner took the lead in developing cemented carbide tools for the mining industry, which promoted the development of continuous mining machinery.

NO.10

Zhuzhou Diamond Cutting Tools Co.Ltd.

Zhuzhou Diamond Cutting Tools Co., Ltd., established in June 2002, is located in the national high tech Industrial Development Zone of Zhuzhou City, Hunan Province, with wholly-owned sales subsidiaries in the United States and Germany. It is a leading integrated supplier of cemented carbide cutting tools in China, integrating production, research and marketing.

Zhuzhou Diamond provides users with indexable numerical control blades and supporting high-precision tools for high-precision turning, milling, boring and milling, drilling pin, cutting, grooving and thread processing, as well as various high-quality welding blades, clamping blades, carbide hole processing tools and tool systems. Different needs to map and sample production of all kinds of cutting tools, to provide a complete set of mechanical manufacturing solutions.

What is the difference between end mills and keyway mills?2021-09-27T01:26:14+00:00

What are the differences?

  • The purpose is different The vertical milling cutter is used to process plane or cylindrical surface, its outer diameter is relatively loose, while keyway milling cutter is used to process keyway, its outer diameter directly affects the matching quality of keyway and keyway, so the tolerance is more strict.
  • The number of cutter teeth is different Endmills generally have more than three teeth, keyway mills generally have two teeth.
  • The difference of blade belt In order to improve the working efficiency of end milling cutter, there are many edge strips.
  • The larger the diameter is, the more the edge strips are; Keyway milling cutter generally has two edge belts, mainly for axial feed like drill bit.
  • The feed is different The end milling cutter can’t feed in the axial direction, it can feed in the axial direction only when it moves in the radial direction; Keyway milling cutter can be axial straight into the feed, equivalent to a drill, can drill a flat bottom hole.
Schematic diagram of milling processing

How to distinguish different end mills?

  • End mills with different number and length of edges. The number of cutting edges is selected according to the cutting mode of end mill. For example, when cutting a groove with the same cutting width and tool diameter, a larger chip holding groove is needed, and a 2-edge end mill is generally selected. In the case of side cutting with smaller cutting width, the tool rigidity should be given priority and the multi-edge end mill should be selected.Selection of blade length. According to the depth of groove shape and other processing shapes, the best edge length of end mill is selected. If we pay attention to the number of regrinding and choose the end milling cutter with too long blade, it will produce chatter, which will lead to the failure to give full play to the characteristics of the end milling cutter, resulting in the difficulty to achieve high-precision finishing surface and other adverse effects.
  • End mills with different helix angles. The larger the helix angle of the end mill, the longer the contact length between the workpiece and the cutting edge. In this way, the load on the cutting edge per unit length can be reduced, so the tool life can be prolonged. But at the same time, the cutting resistance will become larger, so it must be considered to use the tool holder with high clamping rigidity.

Types and uses of milling cutters

Category Name Application
By purpose Cylindrical milling cutter Used for machining plane on horizontal milling machine. The cutter teeth are distributed on the circumference of the milling cutter and can be divided into straight teeth and spiral teeth according to the tooth shape. According to the number of teeth, it can be divided into coarse teeth and fine teeth. The helical gear coarse tooth milling cutter has less teeth, high tooth strength and large chip space, which is suitable for rough machining, while the fine tooth milling cutter is suitable for finish machining.
Face milling cutter It is used in vertical milling machine, end face milling machine or gantry milling machine to process plane. There are cutter teeth on the end face and circumference, as well as coarse teeth and fine teeth. There are three types of structure: integral type, inlaid type and indexable type.
End mill It is used for machining groove and step surface. The cutter teeth are on the circumference and end face, and can't feed along the axial direction when working. When the end milling cutter has an end tooth passing through the center, it can feed axially.
Three face milling cutter It is used for machining all kinds of groove and step surface. There are cutter teeth on both sides and circumference.
Angle milling cutter It is used for milling grooves with a certain angle. There are two kinds of single angle and double angle cutters.
Saw blade milling cutter It is used to process deep groove and cut off workpiece. There are many cutter teeth on the circumference. In order to reduce the friction during milling, there are 15 '- 1 on both sides of the cutter teeth ° The secondary deflection angle of the system. In addition, there are keyway milling cutter, dovetail groove milling cutter, T-shaped groove milling cutter and various forming milling cutters.
By structure Integral The cutter body and cutter teeth are integrated.
Integral welding tooth type The teeth are made of cemented carbide or other wear-resistant tool materials and brazed on the cutter body.
Inlaid type The cutter teeth are fixed on the cutter body by mechanical clamping. The exchangeable cutter teeth can be the cutter head of integral cutter material or the cutter head of welding cutter material. The milling cutter with the cutter head mounted on the cutter body for grinding is called internal grinding type; If the cutter head is grinded separately on the fixture, it is called external grinding.
Indexable inserts This structure has been widely used in face milling cutter, end milling cutter and three face edge milling cutter.

For the hard cutting materials with low heat conductivity and great influence on the heating of the blade tip, the use of large spiral angle end milling cutter is helpful to prolong the tool life. In addition, the characteristics of the finishing surface change due to the helix angle. For example, when smooth finishing is required, large helical angle end mills can be used sometimes.

However, when using the large helix angle end milling cutter, the cutting resistance will increase, and the force of the right spiral angle tool will also increase. Therefore, corresponding measures must be taken, such as holding the handle with high rigidity.

Although the rigidity of the tool can be ensured, sometimes small spiral angle end mills are used when the rigidity of the workpiece such as sheet metal processing is low.

Common milling cutter specification sheet

Name Material Size
Saw blade milling cutter High-Speed Steel(HSS)/Tungsten Carbide Ф60—Ф200
Incision milling cutter Ф40—Ф80
Straight tooth three-sided cutter Ф50—Ф130
Gear roller M1-M10
Straight handle keyway milling cutter Ф2—Ф20
Tapered handle milling cutter Ф14—Ф50
Vertebral swirkel trough cutter Ф14—Ф50
How to choose cnc milling cutter fixture?2021-09-26T08:42:21+00:00

When using a vertical milling machine to process some long rectangular templates, it is often necessary to use milling cutter and end milling cutter together, so frequent tool change has reduced the work efficiency, so how to achieve efficient production? This requires the use of end mill chucks.

There are two types of end mill chucks most commonly used in the market:

  • Collet with good concentricity (e.g. spring collet)
  • Side locking collet

How to choose end mill chuck?

  • Chuck with good concentricity
    Taking the spring collet as an example, the spring collet is composed of the collet body, the elastic collet inserted into the collet body and a nut which can tighten the thread on the collet. When the nut is tightened, the elastic chuck encircling the round toolholder can exert a strong clamping force on the toolholder, so the tool can obtain longer life and higher feed speed, and can improve the surface finish of the workpiece. However, this chuck has no physical stop mechanism, so it is easy to cause the bending deformation of the chuck.
  • Side locking chuck
    The side locking chuck will push the tool away from the center when clamping, so the cutting edge on one side of the milling cutter will bear more cutting load. Once the cutting edge is worn, the whole tool will fail in advance. However, in heavy rough milling, the fastening screw can prevent the tool from being pulled out of the chuck hole.
CNC milling cutter fixture
How to detect the hardness of cemented carbide?2021-09-26T08:28:18+00:00

The cemented carbide has a series of excellent performance such as high hardness, strong toughness, wear resistance, heat resistance, corrosion resistance, high-temperature resistance, is known as “industrial teeth”, mostly used to make metal cutting tools, wear parts, etc. Widely used in military, aerospace, machining, metallurgy, oil drilling, mine tools, electronic communications, construction, and other fields.

The hardness of cemented carbide is generally tested by Rockwell hardness (HRC). Rockwell hardness is an index to determine the hardness value based on the indentation plastic deformation depth, with 0.002 mm as a hardness unit. In the Rockwell hardness test, using different indenters and different test forces will produce different combinations, corresponding to different scales of Rockwell hardness. The three most commonly used scales are a, B and C, namely HRA, HRB and HRC:

  • HRA is the hardness obtained by 60kg load and diamond cone indenter, which is used for materials with higher hardness. For example steel sheet, cemented carbide.
  • HRB is the hardness obtained by using 100kg load and 1.5875mm diameter hardened steel ball, which is used for low hardness materials. For example mild steel, non-ferrous metals, annealed steel, etc.
  • HRC is the hardness obtained by 150kg load and diamond cone indenter, which is used for materials with higher hardness. For example quenched steel, cast iron, etc.
PHR Series Portable Rockwell hardness tester
Detection method Characteristics Tools
The hardness of cemented carbide is mainly tested by Rockwell hardness tester. PHR Series Portable Rockwell hardness tester is very suitable for testing hardness of cemented carbide. The weight precision of the instrument is the same as that of the table Rockwell hardness tester, so it is very convenient to use and carry. It belongs to non-destructive test, and the test method is relatively simple. The hardness test of cemented carbide has strong adaptability to the shape and size of the specimen, and the test efficiency is high. PHR Series Portable Rockwell hardness tester can test hard alloy workpieces with thickness or diameter less than 50 mm, hard alloy workpieces with diameter less than 2.0mm and tubular hard alloy workpieces with inner diameter less than 30mm.
What are the advantages of carbide cutting tools?2021-09-26T08:19:13+00:00

Features of hard tools:

High hardness (86-93 HRA, 69-81 HRC);
Good thermal hardness (up to 900-1000 ℃, 60 HRC);
Good wear resistance. The cutting speed of cemented carbide tool is 4-7 times higher than that of high-speed steel, and the tool life is 5-80 times longer. The service life of the mold and measuring tool is 20-150 times longer than that of alloy tool steel. It can cut hard material about 50HRC.

Cemented carbide tool application: cemented carbide tool is generally used in CNC machining centers, CNC engraving machines. It can also be installed on the ordinary milling machine to process some hard and uncomplicated heat treatment materials.

At present, the cutting tools for composite materials, industrial plastics, plexiglass materials and non-ferrous metal materials on the market are all cemented carbide tools.

What is carbide metal?2021-09-26T07:51:26+00:00

Tungsten carbide is a compound of tungsten and carbon. It is a black hexagonal crystal with a metallic luster, similar hardness to diamond and good conductivity.

Tungsten carbide is insoluble in water, hydrochloric acid and sulfuric acid, but easily soluble in the mixed acid of nitric acid and hydrofluoric acid. Pure tungsten carbide is fragile, if a small amount of titanium, cobalt and other metals are added, the brittleness can be reduced.

Tungsten carbide, which is used as steel cutting tool, is often added with titanium carbide, tantalum carbide or their mixture to improve the antiknock ability. The chemical properties of WC are stable. Tungsten carbide powder is used in cemented carbide production.

Cemented carbide powder

Application:

It is widely used in high-speed cutting tools, kiln structural materials, jet engine parts, cermet materials, resistance heating elements and so on.
Used for manufacturing cutting tools, wear-resistant parts, melting crucible of copper, cobalt, bismuth and other metals, wear-resistant semiconductor film.
It can be used as superhard tool material and wear-resistant material. It can form solid solution with many carbides. WC tic co cemented carbide tools have been widely used. It can also be used as an additive for the modification of carbides in nbc-c and tac-c ternary systems. It can not only reduce the sintering temperature but also maintain excellent properties. It can be used as an aerospace material.
Tungsten carbide (WC) powder was synthesized from WO3 and graphite in reducing atmosphere at 1400 ~ 1600 ℃. Dense ceramic products can be prepared by hot pressing sintering or hot isostatic pressing sintering.

How is rebar made?2021-09-26T07:42:52+00:00

Steel bar is a common building material, among which threaded steel is more commonly used in the building. Its scientific name is called cold-rolled ribbed steel. It is a bar that rolls round steel on the cold rolling mill and passes the cold roller to form a regular section shape, which can improve its strength and adhesion with concrete.

The economic benefit is increased after the reinforcement is strengthened by cold working. But the yield strength of cold processed steel bar is relatively large, and the safety reserve is small. So what grade of steel is a cold-rolled ribbed steel bar, and what are its advantages?

Tungsten Carbide Cold Rollers

Cold rolled ribbed steel bar has many advantages in our use. Its steel strength is high, which can save construction steel and reduce project cost. It can save about 40% steel when used in the cast-in-place structure; It can eliminate the phenomenon of the anchorage zone cracking and steel wire sliding, and improve the bearing capacity and crack resistance of the end of the component; The cold-rolled ribbed steel bar is elastic and not easy to bend when pouring concrete, which provides convenience for construction

Advantages of cold rolled ribbed bar:

Cold rolled ribbed steel bar is a new type of cold rolled ribbed steel bar developed in recent years. Its production process increases the process of tempering heat treatment, has obvious yield point, and the strength and elongation indexes are significantly improved.

  • The steel has high strength, which can save construction steel and reduce project cost. Compared with hot-rolled plain round bar, LL550 cold-rolled ribbed bar can save 35% - 40% steel when used in cast-in-place structure (especially in roof).
  • The bond anchorage performance between cold-rolled ribbed bar and concrete is good. Therefore, when it is used in the component, the phenomenon of cracking in the anchorage zone and steel wire sliding is fundamentally eliminated, and the bearing capacity and crack resistance of the end of the component are improved; In reinforced concrete structure, the crack width is smaller than that of plain round steel bar, even than that of hot rolled thread steel bar.
  • The elongation of cold-rolled ribbed bar is higher than that of the same kind of cold-rolled steel.
What is a keyway cutter?2021-09-26T07:36:43+00:00

Keyway milling cutter is a kind of milling tool, and its edge diameter limit error is divided into E8 and D8. Keyway milling cutter has a small helix angle (20 degrees), groove depth, approximately straight back folding, and is similar to twist drill.

Content

  • Difference
  • Grinding
  • Tool setting device
Keyway milling cutter

Difference:

  • Keyway milling cutter can not process plane, while end milling cutter can process plane.
  • Keyway milling cutter is mainly used for processing keyway and groove. Keyway milling cutter is good at keyway milling. For example, the end milling cutter of 6mm is easier to break than the keyway milling cutter of 6mm, and the keyway milling cutter can complete the task smoothly.
  • The cutting amount of the keyway milling cutter is larger than that of the end milling cutter.

Grind:

The width of motor shaft extension keyway "F" (its tolerance is JZ) is generally not easy to guarantee. When machining keyway on end milling machine with standard straight shank keyway cutter, it is easy to exceed tolerance requirement from upper limit. Therefore, our factory uses the method of grinding the circular edge of the knife to meet the requirements of the processing keyway. The specific measures are as follows:

  • The milling cutter is installed on the end milling machine to adjust the longitudinal run out of the milling cutter edge to the spindle centerline to within 0.02mm.
  • Install a piece of cast iron (HT15-33) on the worktable, mill a cylindrical hole with depth of H + 3mm (H is the depth of keyway) on the cast iron with end milling cutter at the speed of 350-450 rpm, and then withdraw the milling cutter to remove the impurities in the hole.
  • Inject proper amount of kerosene and a little 200 mesh silicon carbide grinding material into the hole, adjust it into paste shape, and at the same time, apply a little grinding material on the circumference of the milling cutter.
  • The spindle of the milling cutter is reversed, the rotation speed is 200 rpm, and the depth of the milling cutter inserted into the hole is H + 2 mm.

Tool setting device

When machining the keyway with symmetry less than 0.1 on the shaft, the workpiece can be installed on the universal milling machine with three-jaw chuck and tail thimble. The tool setting device is accurate and fast.

The length of the cylindrical rod is the same as that of the workpiece to be processed. During the operation of the cylindrical rod, first polish it, then check the parallelism between the rod and the worktable, and then press the fixture, then press the vertical support against the rod, press the measuring head of the dial indicator on the highest edge of the milling cutter side, lock the locking screw and the base screw, record the reading of the dial indicator, and then move the tool setting device to the highest edge on the other side of the rod, Check whether the dial indicator reading is the same as above. If it is different, move the worktable until the readings on both sides are the same.

With the above method, as long as the movable gauge holder is swung to make the measuring head of the dial gauge press on the side of the keyway of the workpiece, the symmetry of the working keyway can also be directly measured. The practice in the past two years has proved that this method is effective.

Sharpening of woodworking carbide insert welding tooth saw blade?2021-09-26T06:49:26+00:00

Cemented carbide is hard and brittle, so great attention should be paid in the process of transportation, installation and disassembly to avoid damaging the serrated blade and personal injury. Usually, the grinding work of the woodworking saw blade is completed by the maintenance workers of the buyer, but it is very important to know the necessary knowledge.

Circular saw blades
Woodworking saw blade corresponding to the front angle Type of saw blade Universal saw Electronic cutting saw Single stroke Double stroke Solid wood saw Solid wood slitting saw Solid wood cross-cutting saw Slotting saw
Front angleα 12 15 0 12 18 15 15 15

When does woodworking saw blade need sharpening?

  • If the sawing quality does not meet the requirements, such as burr or roughness on the surface of the product, it needs to be sharpened immediately.
  • When the alloy edge is worn to 0.2mm, it must be ground.
  • Push material hard, paste time.
  • Abnormal noise.
  • When cutting, the saw blade has the phenomenon of sticking teeth, dropping teeth and chipping teeth.

How to sharpen woodworking circular saw blade?

  • The grinding is based on grinding the back of the tooth, and the front of the tooth is paved. There is no special requirement on the side of the tooth.
  • After grinding, the condition that the front and back angles remain unchanged is that the angle between the working face of the grinding wheel and the front and rear tooth surfaces to be grinded is equal to the grinding angle, and the distance that the grinding wheel moves is equal to the grinding amount. To make the working surface of the grinding wheel parallel to the serrated surface to be ground, and then gently contact, and then make the working surface of the grinding wheel away from the tooth surface, then adjust the working surface angle of the grinding wheel according to the grinding angle, and finally make the working surface of the grinding wheel contact with the tooth surface.
  • The grinding depth is 0.01-0.05 mm in rough grinding; The feed rate is suggested to be 1-2 m/min.
  • Manual fine grinding of serrations: after a small amount of wear and chipping on the tooth edge and grinding the serrations with silicon chloride sand wheel, if it is still necessary to grind the serrations, hand grinder can be used to fine grind the serrations to make the tooth edge sharper. In fine grinding, the force should be uniform, and the working face of the grinding tool should be kept parallel when the grinding tool moves back and forth. The grinding amount should be consistent to ensure that all tooth tips are in the same plane.

Front angle grinding

Remove gum and impurities

Rear angle grinding

Rear angle grinding

Comparison of grinding durability of woodworking saw blade

Comparison of grinding durability of woodworking saw blade

What is used to sharpen woodworking saw blades?

A professional automatic grinding and sawing machine, resin CBN grinding wheel, manual grinding and sawing machine and universal grinding machine.

Precautions

  • Before grinding, remove the resin, debris and other debris stuck on the saw blade.
  • The original geometric design angle of the saw blade should be strictly followed to avoid damage to the tool caused by improper grinding. After grinding, it can be put into use only after passing the inspection, so as to avoid personal injury.
  • If manual grinding equipment is used, it is necessary to have an accurate limit device and detect the tooth surface and tooth top of the saw blade.
  • Special coolants should be used for lubrication and cooling during grinding, otherwise, the service life of the tool will be reduced, and even the alloy tool head will have an internal crack, which will lead to dangerous situations.

In a word, the grinding process of cemented carbide saw blade is different from that of the ordinary circular saw blade. When the grinding rate is high, the grinding heat is high, which not only makes the cemented carbide crack but also has poor grinding quality. Through reasonable grinding and use, the service life of the saw blade can be greatly extended (generally about 30 times of regrinding), the requirements of processing technology can be better met, the manufacturing cost can be effectively reduced, and the production efficiency can be improved.

How are the ribs of cold rolled ribbed steel bars formed?2021-09-26T06:51:15+00:00

The diameter of the cold-rolled ribbed steel bar is reduced by hot-rolled wire rods through multiple cold rollers. After the cold roll pressing, the internal stress is eliminated and the crescent ribbed bar with 2D or 3D is formed. Cold rolled ribbed steel bar is a new product of cold-drawn low carbon steel wire in prestressed concrete members. In cast-in-place concrete structure, it can replace grade I steel bar to save steel. It is a better kind of cold processed steel of the same kind.

Cold rolled ribbed steel bar

Technical performance

  • Application effect: Cold rolled ribbed steel bar is a new product of cold drawn low carbon steel wire in prestressed concrete members. In cast-in-place concrete structure, it can replace grade I steel bar to save steel. It is a better kind of cold processed steel of the same kind. Its performance and application effect are as followsThe mechanical property index of LL550 in Chinese national standard "cold rolled ribbed strip" gb13788-2000 is formulated with reference to international standard and developed country standard. The tensile strength is 550MPa and the elongation is standardized in Germany δ From the comparison of these two indexes, the standard of cold-rolled ribbed bar in China is not lower than the international standard.

Advantage

Cold rolled ribbed bars have the following advantages:

  • The steel has high strength, which can save construction steel and reduce project cost. Compared with hot-rolled plain round bar, LL550 cold-rolled ribbed bar can save 35% - 40% steel when used in cast-in-place structure (especially in roof). If we don't use the hook, we need to save more steel. According to the market price of steel, the cost of steel can be saved about 800 yuan per ton of cold-rolled ribbed steel bar.
  • The bond anchorage performance between cold-rolled ribbed bar and concrete is good. Therefore, when it is used in the component, the phenomenon of cracking in the anchorage zone and steel wire sliding is fundamentally eliminated, and the bearing capacity and crack resistance of the end of the component are improved; In reinforced concrete structure, the crack width is smaller than that of plain round steel bar, even than that of hot rolled thread steel bar.
  • The elongation of cold-rolled ribbed bar is higher than that of the same kind of cold-rolled steel.
What is the use of tungsten carbide roller ring?2021-09-26T03:41:36+00:00

The roller is made of WC and CO by powder metallurgy. There are two types of WC roller: integral type and combined type (see cemented carbide roller sleeve). It was born with the development of metal processing industry after the advent of powder metallurgy technology in 1909.

Since the introduction of carbide drawing die in Germany in 1918, the research of cemented carbide in various countries has been stimulated, and rollers for various purposes have appeared one after another. However, the wide application of WC roller was after 1960. In 1964, the first high-speed non twist wire rod mill of Morgen company was born, which increased the finishing speed of wire rod four times at that time.

Hot Rolling Roller & Cold Rolling Roller

Because the finishing mill works under high speed and high stress, the wear resistance of cast iron roll and tool steel roll is poor, the service life of rolling groove is short, the repair and loading and unloading of roll are very frequent, which affects the efficiency of the mill and can not meet the requirements of finishing production. Therefore, it is replaced by a combined tungsten carbide roll. There are more than 200 sets of Morgan mills in the world, which consume hundreds of tons of WC rolls annually.

In the 1980s, tungsten carbide rolls developed in China have been successfully applied to high-speed wire rod mills. Ch series rolls of General Iron and Steel Research Institute of Ministry of metallurgy and YGH series rolls of Zhuzhou 601 plant have been mass-produced.

The composition, microstructure and properties of WC rolls vary with the working conditions of the rolls. Even for the same finishing mill, the composition of the rolls in different stands is different. The high-speed wire rod mill roll is mainly made of tungsten carbide with cobalt as a binder. Due to the poor water quality, a few continuous casting and rolling mills also use tungsten carbide rollers with Co-Ni Cr as binders, so the cost is low.

T.C roller chemical composition & properties of grade
Grade Wc Content Co Content TRS Density Hardness
% % N/mm² G/Cm³ HRA
YG15 85 15 ≥2020 13.9-14.1 ≥86
YGH30 85 15 ≥2700 14.02 ≥84.9

The morphology of the WC roll is shown in figure 1. The properties of the rolls with two common components are shown in the table. The metallographic structure is composed of matrix phase WC and binder phase Co, as shown in Figure 2: white phase is WC, black phase is Co. It can be seen from the table that the hardness of carbide roll increases with the increase of WC content; The toughness increases with the increase of binder content.

The application characteristics are shown in the table. The hardness of the WC roller is high, and its hardness value changes little with temperature. The hardness value at 700℃ is four times that of high-speed steel; The elastic modulus, compressive strength, bending strength and thermal conductivity of the tool steel are more than one time higher than those of the tool steel. All these properties ensure that the wear resistance and deformation resistance of WC roll are much better than that of tool steel roll in the working process, so as to ensure the smoothness of roll groove and the constancy of size, which is very important to ensure the surface quality and dimensional accuracy of wire rod.

Due to the high thermal conductivity of WC roll, the heat dissipation effect is good, the time of high temperature on the roll surface is short, so the high-temperature reaction time of the roll with harmful impurities in the cooling water is short. Therefore, WC roller is more resistant to corrosion and thermal fatigue than tool steel roller.

Production method tungsten carbide roll is produced by powder metallurgy method with tungsten carbide powder and cobalt powder (a small amount of other hard phases or alloy elements can also be added) as raw materials. The above two kinds of powders were wet ground and mixed by ball mill. After mixing, drying and sieving, the mixture become the intermediate product cemented carbide mixture. The mixture is pressed and sintered into roll blank. After grinding, polishing or re-grooving, the roll blank can be used for production.

The quality standards and influencing factors of WC roller are: material porosity, WC grain size, total carbon and free carbon content, density, hardness, magnetic saturation strength, coercive force, bending strength, impurity content, etc. In addition, there are the machining accuracy and surface roughness of the roll. Each index reflects the quality of the roller and indicates its performance. The influencing factors of roller quality are: dispersion, particle size and particle size distribution of WC powder and Co powder in mixture, the content of total carbon, free carbon, oxygen and iron, etc; The type and quantity of binder, the temperature and time of degumming, the temperature, time and atmosphere of sintering, etc. In addition, the precision of the grinding machine and the quality of the diamond grinding wheel affect the quality of roll.

Tungsten carbide roller has been used in various fields of metal plastic processing. From non-ferrous metals to steel, from hot-rolled wire rod, pipe to cold-rolled foil, rebar and so on, tungsten carbide roller is used. China has been able to produce from φ 8~ φ There are dozens of varieties and specifications of 300 mm tungsten carbide rolls. However, with the high speed of wire rods finishing rolling (up to 130m / s), people are exploring ways to improve the hardness and strength of WC roller. This is mainly due to the addition of a small amount of TAC, NBC, Ni, Cr, Mo and other elements into the WC roll; By means of hot isostatic pressing, vacuum sintering low pressure hot isostatic pressing, heat treatment and so on, the roller with better quality can be made.

What is a meltblown die?2021-09-26T03:13:30+00:00

As we all know, the melt-blown cloth is the “heart” of masks, so melt-blown cloth mold is also used to produce melt-blown cloth mold, also known as melt-blown cloth nozzle or spinneret in the industry.

Melt blown cloth mold is made of yk30 (SK3) carbon tool steel, tungsten carbide, and other steel. For the die head of melt-blown cloth, the micro-hole diameter is very small, mostly 0.1-0.3mm, with a spacing of 0.6-0.7mm. For example, a 550mm die has nearly 1000 holes, and the perpendicularity of 0.2mm is the key. Laser drilling has high precision.

Design drawing of melt blown fabric

Design drawing of melt-blown fabric

Most of the die heads are rectangular spinnerets, which are made of SUS316L, SUS304, SUS630, SUS431 and other stainless steel.

In the past, in order to ensure the concentricity of the spinneret micro-hole and pilot hole, it was generally processed from one side, from macropore to micropore. Because of the great overhanging depth, the difficulty coefficient is very high. Due to the urgent need of rapid production, most of the process has been changed to micro-hole processing from the back, but this will produce concentricity, burr and other problems.

After using YFG abrasive flow to solve the problems of burr and hole plugging, polishing and cleaning can be carried out, and the machine can be put into use. In the production of melt-blown fabric, the wire is sprayed through the spinneret of melt-blown fabric mold. Meltblown fabric is the core material of the mask. Polypropylene is the main raw material of the melt-blown fabric. The fiber diameter can reach 1-5 microns.

In the spinneret module, there is a row of spinning micropores under the spinning melt pool, and the diameter of micropores is generally 0.3-0.4 mm. In order to be more conducive to spinning forming, the aspect ratio is much larger than that of conventional melt spinning, which is generally 10-15. At the same time, a special air cavity is formed between the spinneret assembly and the air knife. The high-pressure hot air flows through the narrow slot of the air cavity at a speed similar to the speed of sound. A spinning tap is formed between the blade of the air knife and the tip of the spinneret assembly.

The melt is ejected from the spinning micropores and is clamped by high-speed airflow at the spinning cone, and then stretched to form ultrafine fibers after cooling.

Grinding method of hard alloy taper shank end mill2021-09-25T06:06:23+00:00

What is taper shank end mills?

Taper shank end mills, also known as Morse taper shank end mills, range in size from 6 mm to 100 mm. It consists of a blade and a Morse taper shank. The cutter is used to rough machining plane, step, groove and vertical plane. The number of teeth is small and the space of chip holding is large, which is suitable for rough machining.

Taper shank end mills

Milling features:

  • High productivity milling cutter continuous rotation, and allows a higher milling speed, so it has higher productivity.
  • In intermittent cutting milling, every cutter tooth is cutting intermittently, especially in end milling, the milling force fluctuates greatly, so the vibration is inevitable. When the vibration frequency is the same as or multiple to the natural frequency of the machine tool, the vibration is the most serious. In addition, when high-speed milling, the cutter teeth have to undergo periodic cold and thermal shock, which is prone to crack and chipping so that the tool life is reduced.
  • Multi-Tool and multi-edge cutting milling cutter has many teeth and the total length of the cutting edge is large, which is beneficial to improve the tool life and productivity. But there are also two problems as follows: first, the cutter teeth are prone to radial runout, which will cause unequal load and uneven wear of cutter teeth and affect the quality of a machined surface; Second, the chip space of the cutter teeth must be enough, otherwise the cutter teeth will be damaged.
  • Different milling methods, according to different processing conditions, in order to improve tool life and productivity, different milling methods can be selected, such as reverse milling, forward milling, symmetric milling and asymmetric milling.
What tool is used for turning carbide roll rings?2021-09-25T05:56:54+00:00

What is mill rolls?

Mill rolls are the main consuming part of the rolling mill. According to material, it can be divided into cast alloy steel rolls, high-speed steel (HSS) rolls, high carbon high-speed steel rolls and tungsten carbide rolls, etc. especially for large roll, it is difficult to machine because of its high hardness, uneven allowance and irregular surface, The bn-k1 grade of non-metallic binder cubic boron nitride tool effectively solves the problem of difficult machining of casting roller.

Characteristics and heat treatment process of roller
In the rolling mill of iron and steel plant, the pressure produced by rolling a pair or group of rollers is used to roll the steel. As the roll needs to bear the dynamic and static load, wear and temperature change during rolling, the following characteristics should be ensured for the roll:

  • High hardness
  • Good wear resistance
  • Good impact resistance and hot cracking resistance

The heat treatment process of roll:

  1. The roll needs to be annealed before rough machining to eliminate the internal stress;
  2. After rough machining, quenching and tempering are carried out to improve the surface hardness of the roll and obtain good performance.

After heat treatment, the hardness of the roller is generally higher than hrc45, some even as high as HRC60, which is difficult to process.

How to select tool material for turning casting roll?

As the roll belongs to the casting molding, the tool material selected in the processing is very important, which requires not only high hardness, strength, good wear resistance, but also good impact resistance. Cemented carbide tools (such as YG6 and YG6X) are recommended for casting rolls below hrc45;

For casting rolls above hrc45, it is recommended to use ceramic tools and cubic boron nitride tools. Ceramic tools are only suitable for the finishing process due to their brittleness. Traditional cubic boron nitride tools are also suitable for the finishing process. However, the bn-k1 brand of Valin superhard cubic boron nitride tools is different. They can not only rough the surface of casting rolls but also process with large allowance, Intermittent processing does not break the knife.

Bn-k1 belongs to the non-metallic adhesive cubic boron nitride tool. On the basis of ensuring the hardness and wear resistance of the traditional cubic boron nitride tool, it improves the impact resistance of bn-k1. It can be rough and finish machining, saving the processing cost and improving the processing efficiency.

Cubic boron nitride tools

Models of common turning tools and blades

  • Model selection of common clamping tools for roll turning: Heavy roll lathe is often used for large roll processing, and 40 * 40 tool square of tool holder is commonly used for the heavy roll; The commonly used tool holder angle is 45 degrees, and the tool holder angle is 45 degrees. Some small rolls also use 25 * 25 and 32 * 32 clamping tool handles. The main deflection angle of the tool holder is selected according to the “length diameter ratio” of the roll. The slender roll is usually processed with a 90-degrees or 75-degree tool, while the thick roll is usually processed with 45 degrees or arc tool.
  • The model of cubic boron nitride blade is selected according to the cutting allowance and processing condition of turning roll: when bn-k1 cubic boron nitride blade is used to process cast iron roll, rnmn200800, rnun200800, rnmn150700, rnun160800, rnun150716 and rnmn150716 are generally used. Among them, bn-k1 grade is selected for alloy cast iron and chilled cast iron, and bn-s20 grade is selected for casting high speed steel. Bn-s20 grade is also a non-metallic adhesive cubic boron nitride tool, which has better impact resistance and is suitable for processing cast steel / forged steel parts. Bn-k1 grade is mainly used for processing cast iron parts, and rough and finish processing of the above two kinds of tool grades are OK.
Case study of bn-k1 grade CBN tool for machining cast iron roll
Workpiece material Hardness Grade Processing method Cutting parameters Processing effect
High nickel chromium alloy cast iron roll HSD80 BN-K1 Dry cutting AP = 4mm, FR = 1mm, VC = 55m / min Compared with the European and American brand ceramic blade: on the basis of feed rate 2 times higher than the ceramic tool, the single blade life is 6 times of the ceramic blade.
What is a carbide ball and what are its uses?2021-09-25T05:36:56+00:00

Cemented carbide ball, also known as tungsten steel ball, refers to the ball and ball made of cemented carbide. Cemented carbide ball has high hardness, wear resistance, corrosion resistance, bending resistance, and bad service environment. It can replace all steel ball products. Commonly known as tungsten steel ball, it refers to the ball and ball made of cemented carbide. Cemented carbide ball has high hardness, wear resistance, corrosion resistance, bending resistance, and bad service environment, which can replace all steel ball products.

Cemented carbide balls are widely used in high-end industries, such as precision bearing, instrument, instrument, pen making, spraying machine, water pump, mechanical accessories, sealing valve, brake pump, punching and extruding hole, oil field, hydrochloric acid laboratory, hardness measuring instrument, fishing gear, counterweight, decoration, finishing and so on.

tungsten carbide balls

Component

Carbide ball is a kind of powder metallurgy product that is sintered in a vacuum furnace or hydrogen reduction furnace with high hardness refractory metal carbide (WC, TIC) micron powder as the main component and cobalt (CO) or nickel (Ni), molybdenum (MO) as the binder. The common cemented carbide includes YG, YN, YT, YW series.

Classification

Cemented carbide balls mainly include blank ball, fine grinding ball, punching ball, bearing ball, valve ball, non-magnetic ball, Monel ball, through-hole ball, metering ball, scraping ball and pen ball.

Grade

YG6 cemented carbide ball, YG6X cemented carbide ball, YG8 cemented carbide ball, yg13 cemented carbide ball, YG20 cemented carbide ball, yn6 cemented carbide ball, yn9 cemented carbide ball, yn12 cemented carbide ball, YT5 cemented carbide ball and YT15 cemented carbide ball.

Characteristic

Cemented carbide ball has high hardness, wear resistance, corrosion resistance, bending resistance and bad service environment. It can replace all steel ball products. The hardness of cemented carbide ball is more than 90.5, and the density is 14.9g/cm3.

How to distinguish between cold rolled steel bars and hot rolled steel bars?2021-09-25T05:18:47+00:00

The difference between hot rolled steel bar and cold rolled steel bar: the difference between them is not only the difference between hot and cold but also the strength, yield point, tensile strength and so on. Let’s have a look.

Hot rolled steel bar is a kind of finished steel bar formed by hot rolling and natural cooling. It is made of low carbon steel and ordinary alloy steel under high temperatures. It is mainly used for the reinforcement of reinforced concrete and prestressed concrete structures. It is one of the most widely used steel products in civil engineering. Generally, the steel bars with a diameter of 6.5-9 mm are mostly rolled into coils; The diameter of 10-40mm is usually 6-12M long. Hot rolled steel bars are directly processed on the steel mold in the steel furnace in the steel processing plant, that is, the hot (so-called “hot rolling”) products come out of the furnace and can be used after cooling.

Cold rolled ribbed steel bar

Cold rolled steel bars are produced by cold mill rolls processing of hot rolled steel bars, such as cold drawing and drawing of steel bars at room temperature. The yield strength of the hot-rolled steel bar is low and its plasticity is good. Cold rolled steel bars have higher yield strength and poor plasticity, and their ultimate tensile and compressive strength are the same.
How can we tell which is hot rolled and which is cold rolled at a glance? The initials of hot rolled steel bars are "H", such as HRB335 and hrb40 with hot rolled ribs, and the initials of cold-rolled steel bars are "C", such as crb550 and crb650 with cold-rolled ribs. It is easy to distinguish the beginning letters of hot-rolled and cold-rolled steel bars by remembering them.

How to calculate CNC tool radius compensation?2021-09-25T05:08:00+00:00

The concept of tool compensation (offset) in the CNC machining centers is widely used in our life. For example, when driving a car around a stone, the driver will let the car go around the stone on the side of the stone.

Considering that the car has a certain width, the driver should keep the centerline of the car at least half the width of the car away from the stone. In the 1960s and 1970s, there was no concept of compensation in NC machining, so programmers had to program around the relative relationship between the theoretical route and the actual route of the tool, which was easy to make mistakes. The concept of compensation has greatly improved the efficiency of programming.

Principle of CNC tool compensation

There are three kinds of compensation in NC machining: tool radius compensation, tool length compensation and fixture compensation. This paper mainly introduces the principle of tool radius compensation:

Purpose of tool radius compensation. When contour machining is carried out on the milling machine because the milling cutter has a certain radius, the tool center (tool center) path does not coincide with the workpiece contour. If the numerical control device does not have the function of tool radius automatic compensation, it can only program according to the tool center path (dotted line in Fig. 1).

CNC tool radius compensation

Sometimes its numerical calculation is quite complex, especially when the tool diameter changes due to tool wear, regrinding and tool replacement, it is necessary to recalculate the tool center path and modify the program, which is cumbersome and difficult to ensure the machining accuracy. When the CNC system has the function of tool radius compensation, the programming only needs to be carried out according to the contour line of the workpiece (thick solid line in Fig. 2). The CNC system will automatically calculate the tool center path coordinates to make the tool deviate from the contour of the workpiece by a radius value, that is, radius compensation.

Method of tool radius compensation. CNC tool radius compensation is that the process of tool center path is executed by CNC system. When programming, it is assumed that the radius of the tool is zero, and programming is carried out directly according to the contour shape of the part, while the actual tool radius is stored in a programmable tool radius offset register, The NC system automatically calculates the tool center path according to the part program and tool radius to complete the machining of the part. When the tool radius changes, there is no need to modify the part program, just modify the radius value stored in the tool radius offset register or select the tool corresponding to the tool radius in another tool radius offset register.

What are the advantages of woodworking spiral cutter head?2021-09-25T04:06:24+00:00

With the development of science and technology, the discarded spiral head for woodworking has gradually replaced the traditional flat knife, four side planer, and in the near future, the discarded spiral head will be gradually popularized in the woodworking machinery industry. As an innovative product of flat knife and four side planer, the design of discarded spiral cutter head has become the standard tool for woodworking machinery in Europe and America.

The discarding spiral cutter head distributes the planing points to each processing blade more scientifically, and finely adjusts the angle between the blade and the processing surface, which can be easily adjusted to adapt to the processing of different materials.

Discarded spiral cutter head

Advantages:

  • Spiral cutting surface: high precision design and manufacturing technology, the discarded blades are reasonably arranged around the cutter body to form a smaller cutting surface in unit time, so as to improve the blade burning mark and the berm.
  • Fast heat dissipation speed: some cutter bodies are made of 7 Series aerospace-grade aluminum alloy, which not only improves the heat dissipation speed but also improves the stability and structural strength of the cutter body, thus improving the service life of the cutter body.
  • Discarded blade: the imported Luxemburg small blade is adopted, and the assembly method without high-temperature welding ensures that the original hardness of each blade is above hra93.5 degrees, which greatly improves the service life of the tool. When the blade is passivated, the factory operator can remove the blade by himself, which is easy to operate and saves time.
  • Long service life: the service life of the aluminum alloy cutter body is 1-2 times longer than that of the ordinary flat cutter, and 3-4 times longer than that of the double-face planer and the four-face planer.
  • Sawdust is very small: the sawdust formed by a spiral cutting in unit time is very small, so it is easy to discharge the sawdust from the processed wood surface in the Sino British dust collection system.
  • Low noise: the noise value generated by contacting the wood surface in unit time and contacting the wood surface in the same time with the flat knife will be reduced by 30 to 50dB.
  • Discard type spiral cutter head is divided into: heavy cutting spiral cutter head and light cutting spiral cutter head. Heavy cutting spiral cutter head is mainly used for automatic copying milling machine, vertical shaft machine, four side planer, cutting molding. The light-cutting spiral cutter head is mainly used for vertical shaft machine, four side planer, etc., and the main cutting plane is smooth and round.

How to replace an ordinary planer with a spiral cutter shaft?

  • Check whether the original bearing meets the accuracy requirements, and it is recommended to replace the new bearing. The bearings to be replaced shall be P5-grade bearings with low noise and high precision.
  • Check the inner diameter of the bearing pedestal (the inner bore of the bearing has been worn out for many years, which will cause a lot of noise and damage the bearing in a short time, and make the bearing go to the inner or outer circle). If there is a problem with the bearing pedestal, it must be replaced with a new one.
  • Check and clean the shaft head and seat before installing the bearing; Add 3 × white grease into the bearing; When installing the bearing, it is required to press the bearing in smoothly and evenly (if there is hydraulic equipment, please use hydraulic equipment to install the bearing, if there is no hydraulic equipment, steel sleeve should be used to contact the inner ring of the bearing to knock in evenly, so as to avoid damaging the outer circle of the shaft head by knocking on one side).
  • There are four cutting-edge surfaces. If one cutting edge of the blade is blunt, it is necessary to tighten the screw anticlockwise to clean the tool holder and blade. It is recommended to use gasoline or Tianna water to clean it easily; When changing the cutting edge, we must pay attention to: each blade has a mark on the surface, and we must ensure the uniform orientation, so as to avoid uneven wood cutting surface caused by the wrong replacement of the new and old cutting edge.
  • If the screw is too tight or rusty, it is difficult to loosen it. First, put the bit into the plum blossom mouth of the screw, and tap it gently with a small hammer (pay attention not to damage the blade), and then it is easy to loosen it with a wrench; To avoid the phenomenon that the screw is rusty and hard to loosen when changing the blade next time, it is recommended that the screw hole must be cleaned every time when changing the blade, and then the screw can be dipped with oil and then screwed into the screw hole so that the screw can be easily loosened when changing the blade next time.
What is the high-temperature alloy KCS10B tool material?2021-09-25T03:52:12+00:00

KCS10B can be used in all kinds of the most common turning tool shapes, sizes and chip breaking groove types. It can be used to cut nickel, cobalt, iron base and other superalloys in aerospace and other fields.

KCS10B has a revolutionary coating, which is attached to the ultra-fine grained cemented carbide substrate. Its coating adhesion is very excellent. When machining superalloy, the tool life can be extended by up to 50%, and it can provide more stable and controllable processing process and higher productivity.

KCS10B overcomes the two most common wear modes in turning superalloys: Crater wear and deep cutting wear, which often lead to unexpected or even catastrophic tool failure.

KCS10B

KCS10B has a revolutionary coating, which is attached to the ultra-fine grained cemented carbide substrate. Its coating adhesion is very excellent. When machining superalloy, the tool life can be extended by up to 50%, and it can provide more stable and controllable processing process and higher productivity. Kcs10b overcomes the two most common wear modes in turning superalloy: crater wear and deep cut wear, which often lead to unexpected or even catastrophic tool failure.

Special sputtering process

  • The key to the success of kcs10b is the high power pulsed magnetron sputtering (high PIMS). In the traditional PVD coating process, small raindrops like AlTiN will fall on the tool.
  • The high power meter PIMS produces not small raindrops, but a fine layer of AlTiN fog, which falls on the tool to form a series of extremely thin, smooth and wear-resistant coatings.

Less wear

High-temperature alloys such as Inconel 718 and WCCo 31 are a headache due to rapid tool wear and unpredictable tool life. Kcs10b has been proven to reduce deep cut wear and extend tool life from 3 minutes to more than 5 minutes in roughing applications. Tool life in finishing applications performs better, with visible crater wear and subsequent tool failures typically delayed two or three times compared to competitors.

The positive and negative inserts, as well as various chip forming, edge treatment and chip breaking groove types, make kcs10b an ideal solution for turning iron-based (S1), cobalt-based (S2) or nickel-based (S3) superalloys.

Chromium nickel-iron alloy 718 (NiCr19FeNbMo-DIN), 36-39 HRC, continuous turning, external cooling; Cutting parameters: 61m/min (200sfm), 0,25 mm/RPM (0.0096 IPR), 1,5 mm doc (0.06 IPR).

Due to the super-smooth coating and special edge treatment of KCS10B, the deep cutting wear and crater wear are easier to control; In addition to smoother surfaces, the new coating process allows us to create sharper blades.

The advanced honing and edge treatment process reduces the friction that causes heating, thus further improving the tool life, which also means less chip buildup, which is another common failure mode in superalloy materials.

Kcs10b tool life reference
What is the code meaning of CNC milling inserts?2021-09-25T03:38:11+00:00

If you are engaged in NC machining, are you not clear about the key number code on the cutter box when you use the CNC blade; Are you worried about how to choose the right type of blade in the face of many blades? If you have such problems at present, please watch the following content, which will be helpful to you. Because, in the complex world of metal cutting, correct metal cutting means that the first need to understand the workpiece material, and then choose the correct blade groove shape and grade to adapt to specific applications, so as to get twice the result with half the effort!

What is the code meaning of cnc milling inserts
Cutting tools parameters
Cutting tools parameters

In the article "how to distinguish the material grades of workpieces in numerical control processing technology", I explained the characteristics and applicable occasions of the material grades of workpieces (P, m, K, N, s, H). On the toolbox plate in the figure below, P indicates that this type of blade is suitable for cutting steel. The two-digit data not exceeding 50 after P indicates the tool performance, from high wear resistance to high toughness. The performance of p10-p30 in this figure is moderate. In addition, the reference cutting parameters suitable for this tool are also marked. You can understand the above.

So what does CNMG120404-PM on the cutter box plate mean? This is the focus of this paper. Next, mainly explain the meaning of the model. After mastering the basic knowledge of cutting tools, you only need a picture to completely master the rules of blade coding! In the process of NC turning, the workpiece material has a direct impact on tool wear. For example: in steel processing, the main problems are flank wear, crater wear and plastic deformation; In the process of stainless steel processing, the main problems are chip accumulation and groove wear; In cast iron machining, the main problems are flank wear and plastic deformation, which is very necessary for tool selection.

Therefore, the selection of the blade should be based on the material type and application of the workpiece, but also on the shape of the blade. The tip angle of the blade should be from the minimum 35° Change to round blade, as shown in the figure below, and each shape of blade has different characteristics, how to select? Look down.

Blade Shape Blade Shape R Blade Shape S Blade Shape C Blade Shape W Blade Shape T Blade Shape D Blade Shape V
ISO(the first character) R S C W T D V

The larger the tip angle, such as R, means the greater the strength of the blade and the higher the feed rate, but it will increase the cutting force and vibration, which is suitable for rough machining, hard material machining and discontinuous machining;

The smaller the tip angle, such as V, means that the cutting edge strength is worse, but it has better accessibility in profiling, which can reduce the cutting force and vibration, and is suitable for finishing, profiling, longitudinal turning, etc.

After mastering the above knowledge, you can master the tool coding rules and understand the meaning of cnmg120404-pm by looking at the figure below.

Now you can understand the meaning of this blade code! If you find it useful, please pay attention to it and collect it!

CNMG blade parameter
What is a carbide tap?2021-09-24T10:22:24+00:00

Introduction

The utility model relates to a cutter for processing internal thread, which is provided with a groove along the axial direction. It’s also called a screw tap. Taps are

divided into straight groove taps, spiral groove taps and spiral point taps (tip taps) according to their shapes.

The straight groove tap is easy to process, with low precision and high output. It is generally used for thread processing of ordinary lathe, drilling machine and tapping machine, with slow cutting speed. Spiral groove taps are mostly used for drilling blind holes in CNC machining centers, with fast processing speed, high precision, good chip removal and good alignment. There is a chip holding groove in the front of the screw tap, which is used to process through holes.

Most of the taps provided by the tool factory are coated taps, which greatly improves the service life and cutting performance compared with uncoated taps. The cutting load distribution of taps with unequal diameter design is reasonable, the machining quality is high, but the manufacturing cost is also high. Trapezoidal thread taps often adopt unequal diameter design.

What is a carbide tap?

Component

Machine and hand taps are standard taps for cutting common threads. Chinese tool manufacturers usually call high-speed steel grinding tap as machine tap, and carbon tool steel or alloy tool steel rolling (or cutting) tap as hand tap. In fact, their structure and working principle are basically the same. Generally, the tap is composed of working part and handle. The working part is divided into cutting part and calibration part. The former is grinded with cutting cone to undertake cutting work, while the latter is used to calibrate the size and shape of thread.

Purpose

It is used for processing common internal thread of nut or other machine parts (tapping). Machine tap usually refers to high speed steel grinding tap, which is suitable for tapping on machine tool; Hand tap refers to carbon tool steel or alloy tool steel rolling (or incisor) tap, suitable for manual tapping.

Tap is a kind of cutting tool for processing various medium and small size internal threads. It has simple structure and is easy to use. It can be operated by hand or on machine tools. It is widely used in production.

For small internal thread, tap is almost the only tool. The types of taps are: hand taps, machine taps, nut taps, extrusion Taps, etc.

Tapping is a relatively difficult processing procedure, because the tap is almost buried in the workpiece for cutting, the processing load of each tooth is greater than other tools, and the tap along the thread and the workpiece contact surface is very large, when cutting the thread, it must contain and remove chips, therefore, it can be said that the tap works under very bad conditions. In order to make the tapping work smoothly, all kinds of problems should be considered in advance. Such as the performance of the workpiece material, what kind of tool and machine tool to choose, how high cutting speed to choose, feed rate, etc.

Tapping on special workpiece materials

The machinability of workpiece material is the key to tapping. Now the main concern of tap manufacturers is to develop taps for special material processing. According to the properties of these materials, the geometry of the cutting part of the tap is changed, especially its rake angle and the amount of dent (hook) - the degree of dent in the front.

The maximum processing speed is sometimes limited by the performance of the machine tool. For smaller taps, the spindle speed may have exceeded the maximum spindle speed in order to reach the ideal speed [RPM = (sfm x 3.8) / tap diameter].

On the other hand, high speed cutting with a larger tap will produce a larger torque, which may be greater than the horsepower provided by the machine tool. The cutting speed can reach 250 SFM with 700 psi internal cooling tool. On the other hand, the cutting speed of the machine tool without internal cooling facilities can only reach 150 SFM. The tap is different from most metal cutting tools, because it has a very large contact area with the hole wall of the workpiece, so cooling is very important.

If the high-speed steel tap overheats, the tap will break and burn. The geometric characteristics of Noris high-performance tap are large back angle and inverted tap.

The service life of the taps can be greatly improved by the geometric shape of the taps mentioned above combined with special coating surfaces (such as tin, TiCN, CrN or TiAlN). These heat-resistant, smooth coatings reduce the cutting force and allow tapping at higher cutting speeds. In fact, the development of new high-performance taps has greatly improved the speed and power of machine tool spindle.

Carbide tap

As cemented carbide tools gradually replace high-speed steel tools in turning, cemented carbide taps are more and more used in threaded hole processing. Compared with high-speed steel, cemented carbide has high hardness and brittleness. Tapping with cemented carbide taps has the problem of chip treatment. However, cemented carbide tap for processing cast iron and aluminum alloy materials, its use effect is very good, the main form of tap damage is mechanical wear.

As the automobile industry processes a large number of cast iron and aluminum alloy parts, cemented carbide taps are used to obtain long tool life. When machining workpieces of these materials, the service life of cemented carbide taps is longer than that of high speed steel taps.

In the automotive industry, the reduction of tool change time is an important factor, and the long life of cemented carbide wire will minimize the tool change time. The effect is very good when the surface coated carbide tap with small helix angle is used to tap the aluminum alloy workpiece with silicon content of 8% - 12%.

The taps made of submicron grain cemented carbide can increase the toughness of the cutting tool without reducing its hardness, which is very effective in cutting hardened steel, plastics and difficult to machine nickel base alloy.

The dl15ni series nickel alloy special taps produced by Noris company can continuously tap more than 200 screw holes on Inconel 718 under certain conditions, which can only be achieved by regrinding before.

Characteristic

Taps are usually divided into single or group taps. Small and medium sized through hole threads can be tapped with a single tap at one time. When processing blind holes or large-size screw holes, group taps are commonly used, that is, more than two taps are used to complete the processing of one screw hole in turn. There are two kinds of design of group taps: equal diameter and unequal diameter. For taps of equal diameter design, only the length of each tap is different; For the taps with unequal diameter design, the sizes of each thread are different, and only the last one has complete tooth profile.

Characteristic

Taps are usually divided into single or group taps. Small and medium sized through hole threads can be tapped with a single tap at one time. When processing blind holes or large-size screw holes, group taps are commonly used, that is, more than two taps are used to complete the processing of one screw hole in turn. There are two kinds of design of group taps: equal diameter and unequal diameter. For taps of equal diameter design, only the length of each tap is different; For the taps with unequal diameter design, the sizes of each thread are different, and only the last one has complete tooth profile.

Tap classification

  • According to different driving: hand tap and machine tap
  • According to the processing method: cutting tap and extrusion tap
  • According to the processed thread: metric coarse tap, metric fine tap, pipe thread tap, etc
  • According to its shape, it can be divided into straight groove tap, spiral groove tap and spiral point tap
  • According to the tapping direction of tap, it can be divided into parallel tap and reverse tap

Tap type

  • Straight groove tap: The straight groove tap has the best versatility and the strongest rigidity. Therefore, generally in the processing of materials with higher hardness (such as: quenched steel above 40HRC) and chips with powder particles (such as cast iron and cast aluminum), straight groove taps are preferred.
  • Spiral groove tap: Spiral groove taps are more suitable for processing through-hole threads (also known as blind holes), and the chips are discharged upward during processing. Because of the helix angle, the actual cutting rake angle of the tap will increase with the increase of the helix angle. Experience tells us: for materials with high hardness, the helix angle should be selected smaller, generally around 30 degrees, so as to ensure its own rigidity and prolong the life of tap. When processing non-ferrous metals, such as copper, aluminum, magnesium and zinc, which are not very hard, the helix angle should be larger, which can be about 45 degrees. The cutting is sharper, which is conducive to chip removal.
  • Edge angle tap: When machining thread, the chip is discharged forward, and the edge angle tap is preferred for through-hole thread. Because its design is based on the straight groove tap, and then use the grinding wheel to cut a cut obliquely at the edge, so its own rigidity can be comparable to the straight groove tap.
  • Extrusion tap: Different from the first three types of cutting taps, the extrusion taps are processed through the plastic deformation of the material itself, and the internal thread shape is extruded in the bottom hole by extrusion. Therefore, the processing material should not be too hard. The advantage of this method is that it does not produce chips, so 90% of the machining problems can be eliminated. However, due to extrusion molding, there is a small groove on the top of the processed internal thread, so it is not suitable for the work with higher sealing requirements.

How to use tap?

  • When tapping, first insert the tap to make the tap center line consistent with the drilling centerline.
  • Rotate the two hands evenly and add a little pressure to make the tap feed, and there is no need to add pressure after feed.
  • Each time the tap is turned, it reverses about 45 ° To cut off the chips to avoid blocking.
  • If the tap is difficult to rotate, do not increase the rotating force, otherwise, the tap will break.

How to choose taps?

Thread is the most common method to connect mechanical parts, and tap is the most commonly used tool to process internal thread. Proper selection of taps for internal thread processing can ensure the quality of thread connection and improve the service life of taps.

Select tap tolerance zone

All domestic machine taps are marked with pitch diameter tolerance zone Codes: H1, H2 and H3 respectively indicate the same position of tolerance zone, but the tolerance values are different.

The tolerance zone code of hand tap is H4, the tolerance value, pitch and angle error are larger than machine tap, and the material, heat treatment and production process are not as good as machine tap. H4 may not be marked according to regulations.

The grade of tolerance zone of internal thread that can be processed by pitch diameter tolerance zone of tap is as follows: the code of tolerance zone of tap is applicable to the grade of tolerance zone of internal thread

H1 4H、5H
H2 5G、6H
H3 6G、7H、7G
H4 6H、7H

Some enterprises use imported taps. German manufacturers often mark them as iso14h, iso26h and iso36g (international standard iso1-3 is equivalent to national standard h1-3). In this way, the code of tolerance zone of taps and the tolerance zone of Machinable internal threads are marked.

How to choose the standard of tap thread?

There are three common systems of common thread: metric system, English system and unified system (also known as American system). Metric system is a thread with 60-degree tooth angle in mm. For example: m8x1-6h represents the tolerance zone of 8 mm diameter metric fine thread, 1 mm pitch and 6h internal thread.

Inch system is a thread with 55-degree tooth angle in inches. For example: BSW 1 / 4-20 means 1 / 4-inch diameter, coarse pitch 20 teeth per inch, this thread is rarely used. Another unified system is in inches, tooth angle of 60 degrees of thread.

The diameter is less than 1 / 4 inch, which is usually indicated by numbers. From No. 0 to No. 12, the diameter specifications are 0.06 inch to 1 / 4 inch respectively. The United States still mainly uses unified thread.

What is CBN tools?2021-09-24T09:57:35+00:00

CBN (cubic boron nitride) was first synthesized by General Electric (GE) Company in the 1950s under high temperature and high pressure by manual method. Its hardness is second only to diamond but much higher than other materials. Therefore, CBN and diamond are collectively referred to as superhard materials.

Cubic boron nitride (CBN) polycrystalline sintered body is mainly prepared by sintering CBN powder and a small amount of binders (such as CO, Al, Ti and tin) at the pressure of 4000-8000 MPa and temperature of 1300-1900 ℃;

The polycrystalline sintered body with cemented carbide substrate was prepared by sintering the cubic boron nitride powder and binder as a layer and cemented carbide (sheet or powder) as a layer under the above pressure and temperature;

At the same time, the original physical and chemical properties of CBN can be maintained, and the disc with diameter up to 16mm can be made. After being cut into proper shape, CBN can be used as the tool head of turning tool and boring tool, which is suitable for cutting hardened steel, cast iron and nickel alloy.

CBN is a kind of material whose hardness is second only to diamond (diamond), so CBN blade belongs to superhard material tool. Because CBN can withstand the high temperature of 1300~1500 ℃, CBN blade can carry out high-speed cutting of ferrous metals at high temperature without chemical reaction, with high machining accuracy, low surface roughness and cutting life 5-10 times longer than cemented carbide tool.

boron nitride
CBN-Tools

CBN tools have been widely used in many metal cutting industries because of their excellent properties such as high thermal hardness, high wear resistance and not being easy to stick.

The application scope mainly includes the following difficult to machine materials:

  • All kinds of quenched steel, such as carbon tool steel, alloy steel, bearing steel, die steel, high speed steel, etc
  • Thermal spraying materials, such as Ni based and Fe based products
  • Wear resistant cast iron: such as V-Ti Cast Iron, high phosphorus cast iron and chilled cast iron, etc
  • Titanium alloy and heat resistant alloy parts
What are the factors controlling the wire drawing process?2021-09-24T09:20:58+00:00

In metal processing, using external force to let carbon steel, stainless steel, aluminum, copper and other metals forced through the drawing dies, the cross-section is compressed into the required shape and size, this is our common drawing process.

Drawing process can be divided into dry drawing and wet drawing according to the different equipment and lubricants used. Common problems and solutions in wet drawing:

  • First of all, the selection of wet drawing process is generally aimed at small diameter, or surface finish, or metal drawing with special requirements of subsequent processing technology.
  • The main types of wet drawing lubricants are pure oil, synthetic oil, emulsion, paste, etc.
  • The selection of wet drawing lubricant is mainly based on the comprehensive consideration of raw material, mold, surface quality and downstream application.
  • For example, for stainless steel drawing, pure oil with high viscosity and special extreme pressure additives is generally selected; for carbon steel, emulsion is generally selected; for non-ferrous metals, pure oil or synthetic oil or emulsion can be selected according to the final application requirements. There are special requirements, you can also choose paste.
Drawing dies processing
Drawing dies machine

What problems will appear in the process of metal wire drawing?

Generally speaking, in the actual operation, whether dry drawing or wet drawing process, there will be a variety of problems. Let's take a look at the common problems in the process of wet drawing and the corresponding solutions:

  • Discoloration of wire: The surface discoloration of wire (such as copper) is mainly oxidation discoloration, which is caused by improper temperature and humidity conditions. It may be that the concentration of emulsion is too low or the temperature is abnormal; Too much oil is attached to the wire; The water quality is unqualified; Mixing of foreign oil products, etc. To find out the reason of its discoloration, we can take corresponding measures according to the actual situation. For example, if the concentration of emulsion is too low, it will be raised to the normal standard; If the temperature is abnormal, it should be adjusted to 35 ℃~45 ℃; Check whether there is wire drawing oil overflow at the outlet; Remove the foreign oil mixed in the emulsion.
  • The wear of die is big: One of the reasons leading to large die loss is the improper operation of the machine, the other is the wrong choice of lubricant. If the machine does not work properly, the operator needs to practice continuously and check its working condition before each operation. In addition, lubricant plays a key role in assisting and promoting the wire drawing process, and its selection is very important. At present, drawing products from contact are highly praised by many enterprises. On the one hand, it has a complete range of products, covering all drawing applications; On the other hand, vial? Representative lubricant, with the advantages of fast drawing speed, good chemical compatibility, not ease to break wire and so on, can extend the service life of the mold. Not only that, Condat can also customize lubrication solutions, leading the wire drawing industry.
  • Broken wire, scratch and burr: Wire breakage, scratch and burr greatly affect the appearance and quality of products. The causes of these problems may be the contamination of metal chips, the blockage of die hole or the aging of lubricant caused by the direct contact between metal and die due to insufficient lubrication. These problems can be solved by filtering equipment to remove metal chips, remove the blockage and replace the lubricant.
  • Emulsion delamination / excessive surface precipitates: The invasion of microorganisms, low pH, ultra-high hardness and inorganic salt of water for liquid preparation, high temperature of the emulsion may cause emulsion stratification or excessive precipitation on the surface of wire rod, and the solutions should be targeted. If it is the invasion of microorganisms, fungicides can be added, and sodium hydroxide solution or triethylamine alcohol can be added; If pH is too low, sodium hydroxide solution or triethylamine alcohol should be added; When the hardness and inorganic salt of the water for liquid preparation are too high, the water for liquid preparation needs to be replaced; The temperature of emulsion is too high, it needs to be cooled moderately before use.
What are the characteristics of stainless steel milling cutters?2021-09-24T09:03:32+00:00

What are the problems in stainless steel milling?

  • First of all, the coolant will make the chips cool too fast and fuse on the blade, which will reduce the tool life.
  • Too high feed rate will cause the accumulation of materials, and too low feed rate will cause friction between the tool and the workpiece, which will also lead to overheating.
  • In fact, in order to avoid tool bumps, machining stainless steel cutting heat is necessary. When machining stainless steel milling cutter, proper cutting speed should be selected to make the chip light brown.
  • If the chip turns dark brown, the cutting speed has reached the maximum. It is necessary to pay attention to the cutting speed of the milling cutter when machining stainless steel.
What are the characteristics of stainless steel milling cutters

What should be paid attention to when milling stainless steel?

  • Cutting tools should be rigid, advanced, and have as high overload capacity as possible. It is better to cut under 75% of the load calibration capacity of the machine tool.
  • The workpiece and cutter should be clamped firmly, the extension of the cutter should be as short as possible, and additional support can be used when necessary. Whether it is high-speed steel tools or cemented carbide tools, they should be kept sharp at all times. It is better to sharpen them regularly, and do not sharpen them when they have to.
  • Good performance lubricants, such as chlorinated petroleum grease, should be used. This lubricant is particularly effective for heavy cutting where the feed rate is rather slow.
  • For high-speed finishing cutting, kerosene is recommended to dilute the lubricant before use. This mixture can keep the workpiece and tool at a low temperature. Special attention should be paid to the cutting of Cr Ni austenitic stainless steel. When cutting this kind of stainless steel, we should be careful as far as possible and may carry out compulsory cutting to avoid a pause, so as not to cause work hardening and material slipping.

How to choose the milling cutter for stainless steel milling?

The characteristics of milling stainless steel are: the adhesion and fusibility of stainless steel are strong, and the chips are easy to adhere to the cutter teeth, which worsens the cutting conditions; In reverse milling, the cutter teeth slide on the hardened surface first, which increases the trend of work hardening; When milling, the impact and vibration are large, which makes the cutter teeth easy to crack and wear.

In addition to the end milling cutter and some end milling cutters which can be made of cemented carbide, other kinds of milling cutters are made of high-speed steel, especially tungsten molybdenum series and high vanadium high-speed steel, which have a good effect. The tool life can be 1-2 times higher than that of W18Cr4V. Cemented carbide grades suitable for stainless steel milling cutters are YG8, YW2, 813, 798, YS2T, YS30, YS25, etc.

When milling stainless steel, the cutting edge should be sharp and able to withstand impact, and the chip groove should be large. Large helix angle milling cutter (cylindrical milling cutter, end milling cutter) can be used, and helix angle B is from 20 ° Increase to 45 °( n=5 °), The tool life can be increased by more than 2 times, because the working rake angle G0e of the milling cutter is changed from 11 ° Increased to 27 ° Above, milling is light and fast. But b value should not be larger, especially when B ≤ 35 ° To avoid weakening the cutter teeth.

When machining stainless steel pipe or thin-walled parts with wave edge end mill, the cutting speed is light, the vibration is small, the chip is fragile and the workpiece is not deformed. High-speed milling with carbide end milling cutter and indexable end milling cutter can achieve good results in stainless steel milling.

Milling parameter cases

SWC end mill milling 1Cr18Ni9Ti, its geometric parameter is GF = 5 °、 gp=15 °、 af=15 °、 ap=5 °、 kr=55 °、 k′r=35 °、 g01=-30 °、 4 mm, re = 6 mm, when VC = 50 ~ 90 m / min, VF = 630 ~ 750 mm / min, a ′ Pb can reach 20 = 2 ~ 6 mm, milling power is reduced by 44%, efficiency is also greatly improved. The principle is to grind the negative chamfering on the main cutting edge. During milling, the chip build-up is artificially generated to replace the cutting edge for cutting. The rake angle of the chip build-up is ~ 302. Due to the effect of the main deflection angle, the chip build-up is caused by the thrust parallel to the cutting edge generated on a rake face and becomes the secondary chip outflow, which takes away the cutting heat and reduces the cutting temperature.

When milling stainless steel, it is necessary to use the parallel milling method as far as possible. Asymmetric milling method can ensure that the cutting edge smoothly cuts away from the metal, the chip bonding contact area is small, and it is easy to be thrown off under the action of high-speed centrifugal force, so as to avoid the phenomenon of chip spalling and edge collapse when the cutter teeth re cut into the workpiece, and improve the tool durability.

The effect of spray cooling is the most significant, which can increase the durability of milling cutter more than one time. If the general 10% emulsion is used for cooling, the cutting fluid flow should be ensured to achieve sufficient cooling. When milling stainless steel with carbide milling cutter, VC = 70-150 M / min and VF = 37.5-150 mm / min should be selected. At the same time, appropriate adjustment should be made according to different alloy grades and workpiece materials.

Do you know the production techniques of tungsten steel milling cutters?2021-09-24T09:05:35+00:00
Fast feed milling inserts

Tungsten steel milling cutter is a kind of cutter made of tungsten steel (cemented carbide, also known as tungsten titanium alloy). Generally, it is mainly used in CNC machining center and CNC engraving machine.

It can also be installed on ordinary milling machine to process some relatively hard and uncomplicated heat treatment materials. Tungsten steel milling cutter is widely used and high-speed machining is used. The hardness of tungsten steel milling cutter is Vickers 10K, second only to diamond. Because of this, tungsten steel milling cutter is not easy to be worn, and it is brittle and hard, not afraid of annealing.

Characteristic

Cemented carbide tools (especially indexable cemented carbide tools) are the leading products of CNC machining tools. In some countries, more than 90% of turning tools and 55% of milling tools are made of cemented carbide, and this trend is increasing. Since the 1980s, the tool industry has been expanding the production of all kinds of integral and indexable cemented carbide tools or inserts, and their varieties have been extended to all kinds of cutting tools. The indexable cemented carbide tools have been expanded from simple turning tools and face milling tools to all kinds of precision, complex and forming tools. Cemented carbide is also a common material for making drill, face milling cutters and other general cutting tools. At the same time, the use of cemented carbide in reamer, end mill, medium and large modulus gear cutter and broach is increasing. The annual output value of cemented carbide tools and inserts has accounted for more than 30% of the total output value of cutting tools.

The processing technology and parameter design of tungsten steel milling cutter are quite different from that of common structural steel.

Drilling processing:

Due to the poor thermal conductivity and small elastic modulus of stainless steel, it is difficult to process the hole. Tungsten steel milling cutter to solve the problem of hole processing of this kind of material is mainly to select the appropriate tungsten steel tool material.

Boring process:

  • Tool material selection: due to the large cutting force and high cutting temperature when machining stainless steel parts, the tool material should be tungsten steel with high strength and good thermal conductivity.
  • Tungsten steel milling cutter can be used to process quenched parts of this kind of material, which has high wear resistance. Compared with diamond, its outstanding advantage is that its heat resistance is much higher than that of diamond, and it can withstand very high cutting temperature.
  • Tool geometry parameters: tool geometry parameters play an important role in its cutting performance. In order to make cutting light and smooth, tungsten steel milling cutter should adopt larger rake angle to improve tool life. Generally, the rake angle is 10°~20° in rough machining and 15°~20° in semi finish machining; Take 20°~30° for finishing. The selection of main deflection angle is based on 30°~45° when the rigidity of process system is good; If the rigidity of the process system is poor, take 60°~75°, when the ratio of workpiece length to diameter exceeds 10 times, take 90°.
  • The cutting edge of tungsten steel milling cutter should be kept sharp, so as to reduce work hardening. The feed and back feed should not be too small, so as to prevent tungsten steel milling cutter from cutting in the hardened layer and affecting the service life of the cutter.
  • Attention should be paid to the grinding of the chip-breaking groove. Because the stainless steel chips are strong and tough, the grinding of the chip breaking groove on the front face of the tungsten steel milling cutter should be appropriate, so that the cutting process can be easily interrupted, contained and removed.
  • The selection of cutting parameters is based on the characteristics of materials. Low speed and high feed rate are suitable for cutting.
  • The selection of cutting fluid should be appropriate. Because of tungsten steel, it is very important to select cutting fluid with good adhesion resistance and heat dissipation in boring of tungsten steel milling cutter, such as cutting fluid with high chlorine content, and water solution without mineral oil and sulfite with good cooling, cleaning, rust prevention and lubrication.
How to improve the service life of circular slitting blades?2021-09-24T07:51:16+00:00

Circular Slitter Knives can be used as a cutting food tool in the process of use, so how to do for the service life of the cutter blade to continue to improve? The general method is to improve the ability of cutting machine blades to resist mechanical abrasion and the ability of cutting blade anti-corrosion wear. Now we need to know more about it together. The cutter blade is mainly used for the cutting of paper, tape, tape, film, gold, silver, copper, aluminum, jig alloy foil and other articles. The cutter blade is in circular shape. Generally, the circular blade is used in mechanical equipment, mainly cutting, trimming and other processing functions. The circular blade usually has a middle hole, which is designed to fix it on the mechanical equipment, thus achieving the cutting function. There are also many round blades with teeth (flat teeth, sharp teeth, irregular teeth), and the cutting edge has three types: double-sided, single-sided and non-cutting edge.

  • Surface heat treatment: through proper surface heat treatment technology, the development and transformation of the organization management structure of Chinese metals can be made, the surface hardness of cutter blade can be improved and the wear resistance can be increased. The circular blade forms a circular shape outside, and generally, it is used in mechanical equipment, mainly cutting, trimming and other processing functions. The circular blade usually has a middle hole, which is designed to fix it on the mechanical equipment, thus achieving the cutting function. There are also many round blades with teeth (flat teeth, sharp teeth, irregular teeth), and the cutting edge has three types: double-sided, single-sided and non-cutting edge.
  • Layer technology: layer technology is a chemical heat treatment method to change the chemical composition of cutter blade surface and improve the wear resistance and corrosion resistance of cutter blade.
  • Plating technology: electroplating is a traditional Chinese method of protection research. The adaptability of electroplating is very strong, and it is not affected by the size and batch of workpiece. It can be electroplated on iron base, non-iron base, powder metallurgy parts, plastics and graphite.
  • Thermal spraying technology: thermal spraying technology is a method of heating metal, alloy, cermet, oxide, carbide and other spraying materials to melting or semi melting state by using gas, liquid fuel or arc and plasma arc as heat source. The solid surface layer is atomized, sprayed and deposited by high-speed airflow on the surface of the workpiece.
  • Coating technology: coating treatment technology is a kind of material and surface chemical modification research technology developed in China in the early 1970s. It can be applied a thin layer of refractory element gold (or non-metallic) compound with high wear resistance on the cutter blade structure base by our certain method to improve the durability, corrosion resistance and high-temperature oxidation resistance of the cutter blade.

The above five methods can improve the service life of the cutter blade. If you want to improve the service life of your cutter blade, try it.

What are router bits for woodworking?2021-09-24T09:07:35+00:00
Do you know the production techniques of tungsten steel milling cutters?

Woodworking router bits ( milling cutter ) is a rotary cutter with one or more cutting edges, which is mainly used for woodworking milling processing. When the cutter body rotates, the machined object does not rotate, and the cutter teeth intermittently cut off the redundant wood in turn, similar to metal cutting milling cutter.

Structure of woodworking milling cutter

  • Chip evacuation groove: the groove of the milling head is a deep spiral groove running along with the cutter, while the sharp blade along the edge of the groove is called the blade. The cutting edge cuts the material, and the chip of the material pushes the chip discharge slot through the rotating drill bit. Each chip chute has almost always had a blade, but some cutters have two blades per chip chute. Generally, the chip chute and blade can be used interchangeably. Milling cutters may have one to more blades, and two, three, and four are the most common. Usually, the more teeth the blade has, it can remove the material faster. Therefore, the 4-tooth cutter can cut materials at twice the speed of the 2-tooth cutter.
  • Helix angle: the groove of the milling cutter is almost always spiral. If the chip chute is straight, the entire blade will immediately impact the material, causing vibration, reducing accuracy and surface quality. The chip discharge slot can be set at a certain angle to make the blade gradually enter the material and reduce the vibration. Usually, the finishing tool has a higher spiral angle to get better machining.
  • Router bits handle: a handle is a cylindrical (non-groove) part of a tool that is used to secure and position it in the tool holder. The handle can be completely circular and held by friction or may have a welding plane, where the set screw is also called a headless screw that contacts without tool sliding to increase torque. The diameter may be different from the diameter of the cutting part of the tool, so it can be maintained by a standard tool clamp.
Woodworking router bits structure
What is the prospect of the market for precision wire drawing dies?2021-09-24T09:09:00+00:00
Factory Long Working Life PCD Wire Drawing Die for Alloy Wire

Wire drawing die is an important tool for drawing all kinds of metal wire. The quality of wire drawing die directly affects the quality of wire, and the life of wire drawing die affects the wire drawing output and production efficiency.

Therefore, to improve the quality of drawing die and prolong its life is the content of drawing die manufacturers' continuous research. The quality of wire drawing die is related to life and material, pass design, manufacturing process, die making equipment and testing instruments.

Where are the main producers of wire drawing dies in China?

According to the latest data provided by the cemented carbide branch of China Tungsten Industry Association, in 2020, there will be 500 cemented carbide production enterprises in China, most of which are mainly concentrated in the producing areas of tungsten mines, such as Hunan Province, Jiangxi Province and Guizhou Province.

The main products of Zhuzhou UKO precision carbide Co., Ltd. are: polycrystalline diamond drawing dies, special drawing die, wire and cable extrusion die, cemented carbide (tungsten steel) standard parts and other more than 1800 varieties, which are widely used in automobile parts, non-ferrous metal processing, steel, hardware, military industry, aerospace and other fields, Therefore, in the drawing die manufacturers, product technology and design strength is very good.

UKO is equipped with various equipment for manufacturing and testing molds, supplemented by more than 60 professional and technical personnel and mold manufacturing personnel with rich practical experience. As long as users provide product drawings or samples, they can provide customers with high-precision molds in a short time.

What is a tungsten steel cutting knife?2021-09-24T02:35:02+00:00
Tungsten steel carton board cutting knife

Tungsten steel knife, also known as tungsten carbide cutting knife or tungsten carbide slitting knifeAnchor icon, includes tungsten steel carton board cutting knife, cutting machine blade, V-CUT blade, slitting blade, CNC blade, cutting machine blade, widely used for slitting paper, plastic films, cloth, foam, rubber, copper foils, alumium foils, graphites and so on.

What material is used for tungsten steel slitting cutter?

The slitter knife is made of tungsten carbide materials, but other materials are available. Such as HSS, 9CrSi, Cr12Mo, VW6Mo5, Cr4V2,hard alloy, etc.

Are you manufacturer or trading company?2021-09-23T07:39:54+00:00

We are a manufacturer of tungsten carbide products.

Where is your factory located?2021-09-23T07:35:03+00:00

We are located in Zhuzhou city, Hunan province where is 2 hours-driving from Changsha airport.

Is the price competitive?2021-09-23T07:33:17+00:00

UKO offers reliable products at a good price.

Are the products high quality?2021-09-23T07:28:28+00:00

Yes. The raw material will be tested before bulk production, and we will check the physical properties, shape, and tolerance for ensuring qualified products before shipping.

How to place an order of tungsten carbide products?2021-09-23T07:24:54+00:00
  • Fill your order List in our online inquiry system. ( also you can directly contact our salesperson by e-mail/phone/Whatsapp )
  • Within 24-hours feedback when receiving your message.
How we can trust your company?2021-09-23T07:21:06+00:00

We support Alibaba trade insurance, 100% products quality protection, 100% on-time shipment protection, 100% payment protection for your covered amount.

What’s your delivery time?2021-09-23T04:28:19+00:00
  • For the normal type which we have mold, it takes two weeks after receiving the advance payment.
  • For the non-standard which we do not have mold, it takes 4 to 6 weeks when receiving the advance payment.

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