grinding wheel hardness depends mainly on the amount of binding agent is added to the number and density of abrasive grit off easily, said lower abrasive hardness; on the contrary, represents a high hardness. Hardness grades are generally divided into super-soft, soft, soft, medium, medium-hard, hard and superhard seven level, from these levels may also be subdivided into several smaller stages. The method of measuring the hardness of abrasive, more commonly used hand cone, mechanical cone method, Rockwell hardness measurement method and blasting hardness assay.
Hardness of the dynamic elastic modulus of the abrasive has a corresponding relationship, which is conducive to the determination by the abrasive audio method to represent the dynamic elastic modulus of the abrasive hardness. In grinding, the high if they are grinding the workpiece material hardness, generally used in low hardness abrasive; on the contrary, the selection of high hardness abrasive discs.