(1) The processing flexibility can be improved, the grinding wheel grinding limit has been exceeded, and the workpieces with different geometric shapes can be processed by changing the cutting edge and the way of cutting.

(2) The environmental problems in cutting process are becoming more and more serious. The waste liquid and waste generated by grinding process are more and more difficult to handle and remove, and are harmful to the human body. However, it is of great significance for hard cutting not to add coolant.

(3) high cutting efficiency, short processing time, small equipment investment costs, can reduce processing costs;

(4) cutting the same volume consumes only 20% of the energy of grinding, resulting in less cutting heat, the processing surface is not easy to cause burns and tiny cracks, easy to maintain the integrity of the surface properties of the workpiece;

(5) In the same metal removal rate, hard cutting saves energy compared with grinding.