What Type of Tool Holder Is Used for Stainless Steel?

What type of tool holder is used for processing stainless steel workpiece, and what are the basic requirements?

Geometric Parameters of the Tool Holder

The requirements for tool geometrical parameters during the processing of stainless steel parts should generally be considered from the choice of rake angle and back angle. When selecting the rake angle, factors such as the chip breaker, the presence or absence of chamfer and the positive and negative angle of the blade inclination should be considered. Regardless of the tool, a larger rake angle must be used when machining stainless steel. The clearance angle should not be too small, but not too large. If the clearance angle is too large, the wedge angle of the tool is reduced, the strength of the cutting edge is reduced, and the wear of the tool is accelerated. Generally, the relief angle should be appropriately larger than when processing ordinary carbon steel.

Surface Finish of the Cutting Part of the Tool Holder

Requirements for the surface roughness of the cutting part of the tool during the processing of stainless steel parts. Increasing the surface finish of the cutting part of the tool can reduce the resistance when the chips are curled and improve the durability of the tool. Compared with the processing of ordinary carbon steel, when processing stainless steel, the cutting amount should be appropriately reduced to slow down tool wear; at the same time, appropriate cooling and lubricating fluid should be selected to reduce the cutting heat and cutting forces during the cutting process and prolong the service life of the tool.

The Material of Tool Holder

The tool holder material is required for the processing of stainless steel parts. The tool holder must have sufficient strength and rigidity to avoid chattering and deformation during the cutting process. This requires the use of a suitably large cross-sectional area of the tool holder, and the use of higher-strength materials to manufacture the tool holder, such as the use of quenched and tempered 45# steel or 50# steel.

Material of the Cutting Part of the Tool Holder

When processing stainless steel parts, the requirements for the cutting part of the material by the tool. When processing stainless steel, the material of the cutting part of the tool is required to have high wear resistance and maintain its cutting performance at a higher temperature. Currently commonly used materials are: high-speed steel and cemented carbide.

Cemented Carbide Materials

Because high-speed steel can only maintain its cutting performance below 600°C, it is not suitable for high-speed cutting, but is only suitable for processing stainless steel at low speeds. Because cemented carbide has better heat resistance and wear resistance than high-speed steel, tools made of cemented carbide materials are more suitable for cutting stainless steel.

To improve the surface quality of stainless steel parts, it is necessary to use cemented carbide tools for processing. The cutting amount is slightly lower than that of turning general carbon steel workpieces. In particular, the cutting speed should not be too high. Generally, the cutting speed Vc=60~80m/min is recommended. The cutting depth is ap=4~7mm, and the feed f=0.15~0.6mm/r is appropriate.

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