Because the burn is caused by a large amount of heat generated in the grinding area but not released in time, to avoid the burn, we must reduce the generation of heat and accelerate the heat emission, that is, reduce the internal and external friction during grinding, and make the workpiece fully and effectively cooled. For the cutting fluid, its component concentration should be appropriate, the flow and pressure should be sufficient, and it really plays the role of cleaning (washing the friction of grinding wheel and workpiece), cooling and lubrication, cooling and lubrication.
Reducing the generation of grinding heat is ultimately to reduce the internal and external friction during grinding. The following factors should be comprehensively considered:
▲ reduce the grinding thickness to reduce the metal plastic deformation and internal friction, so as to reduce the grinding
Heat cutting;
▲ by increasing the rotating speed of the workpiece, the time of the workpiece grinding surface passing through the grinding area is shortened, which can be reduced
Accumulation of grinding heat;,
▲ in terms of the characteristics of the grinding wheel, the grinding hardness should not be too hard and the structure should not be too fine, otherwise it will be blunt
The abrasive is not easy to fall off, and the micropores between the abrasives are easy to plug, which reduces the cutting performance of the grinding wheel, increases the contact area between the workpiece and the grinding wheel, strongly squeezes on the workpiece surface, and friction leads to an increase in temperature. Therefore, in order to avoid burns and ensure grinding efficiency and workpiece accuracy, the grinding wheel with low hardness and large organization number can be selected during rough grinding, and the larger grinding thickness can be selected. During final grinding, select a hard grinding wheel with small organization number to ensure effective dressing of the grinding wheel, and select a small grinding thickness. For materials with high grinding strength, high hardness and poor thermal conductivity, it is advisable to adopt a small feed rate and increase the workpiece speed, which can effectively avoid burns.