The hardness of the flap wheels is the degree of difficulty falling off the surface of the flap wheels. The hardness of the flap wheels is soft, that is easy to fall off, the hardness of the flap wheels is hard, that is hard to fall off. The hardness of the grinding wheel and the hardness of the abrasive are two different concepts. The same kind of abrasive can be made of different hardness of the flap wheels, it is mainly determined by the properties of the binder, the number of grinding wheel manufacturing process. Grinding and cutting of the significant difference is that the grinding wheel with "self sharp", the choice of flap wheels hardness, in fact, is the choice of the self sharpness of the grinding wheel, but also sharp wear debris not too early to fall, but also do not wear blunt not fall off.
The general principle of choosing the hardness of the flap wheels is: the processing of soft metal, in order to make the abrasive is not premature to fall off, the selection of hard grinding wheel. Processing hard metal, in order to timely and so that the wear debris off, so as to reveal sharp edges and corners of the new abrasive (that is, since the sharp), the selection of soft grinding wheel. The former is due to the grinding of soft materials, the wear of the grinding wheel is very slow, do not need to be too early to leave; the latter is because in the grinding of hard materials, the wear of the grinding wheel wear faster, the need for faster updates.In order to ensure the accuracy and roughness, a slightly hard grinding wheel is to be used to ensure the accuracy and roughness. The thermal conductivity of the workpiece material is poor, easy to produce burn and cracks (such as grinding hard alloy, etc.), the selection of the grinding wheel should be soft.
The structure of the flap wheels is the ratio of the size of the abrasive, the bond, the three part of the volume of the grinding wheel. The percentage of the grinding wheel is usually classified by the size of the grinding wheel. The grinding wheel has three kinds of organization: compact, medium and loose; fine is divided into 0-14 number, there are 15 levels. The smaller the organization number, the larger the proportion of abrasive particles, the more compact the grinding wheel, and vice versa.