Grinding wheel hardness selection principle
The choice of hardness depends primarily on the material being ground, the grinding efficiency and the quality of the machined surface. Hardness refers to the difficulty of the abrasive wheel falling off under the action of external force. In order to meet the requirements of different workpiece material grinding, the grinding wheel is divided into different hardness grades. The grinding wheel is selected too hard, the blunt abrasive grains are not easy to fall off, the grinding wheel is easy to block, the grinding heat is increased, the workpiece is easy to burn, the grinding efficiency is low, and the surface quality of the workpiece is affected; the grinding wheel is selected too soft, and the grinding grain is also off when it is sharp. Increases the wear of the grinding wheel, easily loses the correct geometry and affects the accuracy of the workpiece. Therefore, the choice of the hardness of the grinding wheel should be appropriate. It should also be considered according to the contact area of the grinding wheel and the workpiece, the shape of the workpiece, the way of grinding, the cooling method, the type of bonding agent of the grinding wheel and other factors.
Grinding wheel hardness selection principle: when grinding soft materials, choose harder grinding wheel, when grinding hard material, choose soft grinding wheel; when grinding soft and tough non-ferrous metal, hardness should be selected softer; grinding thermal conductivity is poor The material should be selected as a softer grinding wheel; when the end face grinding is more than the circumferential grinding, the hardness of the grinding wheel should be softer; under the same grinding conditions, the hardness of the resin bond grinding wheel is 1~2 smaller than that of the ceramic bond grinding wheel. When the grinding wheel rotates at a high speed, the hardness of the grinding wheel can be softened by 1~2. The grinding with the coolant is 1~2 lower than the hardness of the grinding wheel. The choice of binder should be considered in terms of grinding methods, speed of use and surface processing requirements.
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