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.

Types of turning toolsWhether 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.

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?

NameTool materialAdvantage
White corundum grinding wheelIt is suitable for common grinding of high-speed steel toolsanchor icon, cemented carbide toolsanchor icon, 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 wheelSuitable 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 wheelIt 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.
Posture and method of turning tool sharpening

Sharpening safety knowledge

  • Before sharpening the tool, first, check whether the grinding wheel has cracks and whether the grinding wheel shaft nut is tightened, and use it after the trial run, so as to prevent the grinding wheel from breaking or flying out to hurt people.
  • The tool should not be sharpened too hard, otherwise, the hand will slip and touch the grinding wheel surface, resulting in industrial accidents.
  • Wear protective glasses when sharpening to avoid grit and iron filings flying into the eyes.
  • Do not stand in the direction of rotation of the grinding wheel when grinding, in case of accidents.
  • When grinding the small cutter head, the small cutter head must be installed on the cutter bar.
  • The clearance between the grinding wheel bracket and the grinding wheel shall not be greater than 3 mm. If it is too large, it shall be adjusted properly.