As a cutting tool, the characteristics of the grinding method of the workpiece

Grinding is a method of cutting a workpiece on a grinding machine with a grinding wheel as a cutting tool. The characteristics of this method are:

(1) Because the abrasive grains of the grinding wheel have high hardness and heat resistance, the grinding can process materials with high hardness, such as hardened steel and cemented carbide.

(2) The characteristics of the grinding wheel and the grinding machine determine that the grinding process system can make uniform micro-cutting, generally apu003d0.001～0.005mm; the grinding speed is very high, generally up to vu003d30～50m/s; the stiffness of the grinding machine Good; hydraulic transmission is adopted, so grinding can economically obtain high machining accuracy (IT6～IT5) and small surface roughness (Rau003d0.8～0.2μm). Grinding is one of the main methods of finishing parts.

(3) The temperature in the grinding zone is very high due to severe friction. This will cause stress and deformation of the workpiece, and even cause burns on the surface of the workpiece. Therefore, a large amount of coolant must be injected during grinding to reduce the grinding temperature. Coolant can also play a role in chip removal and lubrication. (Guide: Detailed explanation of stamping die materials and heat treatment process)

(4) The radial force during grinding is very large. This will cause the elastic retreat of the machine tool? Grinding wheel? Workpiece system, making the actual depth of cut less than the nominal depth of cut. Therefore, when grinding is about to be completed, smooth grinding should not be carried out to eliminate errors.

(5) After the abrasive grains are blunt, the grinding force will increase, causing the abrasive grains to break or fall off, revealing the sharp edge again. This characteristic is called self-sharpening. Self-sharpening enables the grinding to be carried out normally within a certain time, but after a certain working time, manual trimming should be carried out to avoid vibration, noise and damage to the surface quality of the workpiece due to increased grinding force.

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