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Common hardness grades of grinding wheels
Sep 25,2024
The hardness of a grinding wheel refers to the ease with which the abrasive particles on the surface of the wheel detach under the action of grinding force.
The hardness of a grinding wheel refers to the ease with which the abrasive particles on the surface of the wheel detach under the action of grinding force. The hardness of the grinding wheel is soft, which means that the abrasive particles of the grinding wheel are prone to falling off; The hardness of the grinding wheel is hard, which means that the abrasive particles are not easily detached. The hardness of a grinding wheel and the hardness of an abrasive are two different concepts. The same abrasive can be used to make grinding wheels of different hardness, which mainly depends on the performance and quantity of the binder and the manufacturing process of the grinding wheel. The significant difference between grinding and cutting is that the grinding wheel has "self sharpening". Choosing the hardness of the grinding wheel is actually choosing the self sharpening performance of the grinding wheel. I hope the sharp abrasive particles do not fall off too early, nor do they fall off after being dulled.
1. 2 and 3 represent the order in which hardness increases. The general principle for selecting the hardness of grinding wheels is to use hard grinding wheels when processing soft metals to prevent premature detachment of abrasives. When processing hard metals, soft grinding wheels are used to quickly remove dull abrasive particles and expose new abrasive particles with sharp edges (i.e. self sharpening). The former is because when grinding soft materials, the working abrasive particles of the grinding wheel wear very slowly and do not need to separate prematurely; The latter is because when grinding hard materials, the working abrasive particles of the grinding wheel wear out quickly and need to be removed quickly. to update. During precision grinding, a slightly harder grinding wheel should be selected to ensure grinding accuracy and roughness. When the material of the workpiece has poor thermal conductivity and is prone to burns and cracks (such as grinding hard alloys), the selected grinding wheel should be softer.
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