Abrasive Hardness

The hardness of abrasive tools mainly depends on the amount of binder added and the density of abrasive tools. The abrasive particles that are easy to fall off indicate that the hardness of abrasive tools is low; On the contrary, it means high hardness. The hardness grade is generally divided into seven grades: super soft, soft, medium soft, medium, medium hard, hard and super hard, and several sub-grades can be subdivided from these grades. The commonly used methods for measuring the hardness of abrasive tools include hand cone method, mechanical cone method, Rockwell hardness tester method and sandblasting hardness tester method.
There is a corresponding relationship between the hardness of abrasive tools and their dynamic elastic modulus, which is conducive to measuring the dynamic elastic modulus of abrasive tools by audio frequency method to express the hardness of abrasive tools. In the grinding process, if the material hardness of the workpiece to be ground is high, the abrasive tool with low hardness is generally selected; On the contrary, abrasive tools with high hardness shall be selected