Abstract: In this paper the constitutional structure and specific cutting performance of a new type of the super hard tool material(CBN)is introduced and tom- pared with diamond, The application of grinding wheels of CBN to grinding hard gears is taken for example, It has been shown that CBN has better ma-chining properties and good application prospects in precise processing and super precise processing, Meanwhile, the problems to be solved in practical application are also pointed out,

Key words: CBN Diamond Grinding wheel Cutting performance con