How To Choose The Hardness Of The Grinding Wheel

The hardness of the grinding wheel refers to the firmness of the abrasive particles and the adhesive on the surface of the grinding wheel. The hardness of the grinding wheel is soft, which means that the abrasive grains of the grinding wheel are easy to fall off, and the hardness of the grinding wheel is hard, which means that the abrasive grains are more difficult to fall off.

The hardness of the grinding wheel and the hardness of the abrasive are two different concepts. The same abrasive can be made into grinding wheels with different hardnesses, which mainly depends on the performance and quantity of the bond 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 of the grinding wheel. It is hoped that the sharp abrasive particles will not fall off too early, nor should they not fall off after being blunt. .

The general principle of choosing the hardness of the grinding wheel is: when processing soft metals, in order to prevent the abrasive from falling off prematurely, use a hard grinding wheel. When processing hard metals, in order to make the blunt abrasive particles fall off in time, thereby exposing new abrasive particles with sharp edges and corners (ie, self-sharpening), soft grinding wheels are used. The former is because when grinding soft materials, the working abrasive grains of the grinding wheel wear very slowly and do not need to be detached too early; the latter is because when grinding hard materials, the working abrasive grains of the grinding wheel wear faster and require faster renew. In order to ensure the precision and roughness of grinding, a slightly harder grinding wheel should be used for fine grinding. When the workpiece material has poor thermal conductivity and is prone to burns and cracks (such as grinding cemented carbide, etc.), the selected grinding wheel should be softer.