As we all know, the composition of diamond material is carbon, diamond and iron have affinity, the cutting process, the diamond thermal conductivity is superior, fast cooling, but should pay attention to cutting heat should not be higher than 700 degrees, otherwise it will happen graphitization, the tool will be very Fast wear. Because diamond reacts with W, Ta, Ti, Zr, Fe, Ni, Co, Mn, Cr, Pt and so on at high temperature, it will chemically wear with ferrous metal (iron-carbon alloy) Used to process ferrous metals only for non-ferrous and non-ferrous materials, CBN is perfectly capable of cutting ferrous metals even at 1000 ° C. It has become the main cutting tool material for future difficult-to-machine materials. General super-hard material refers to synthetic diamond, artificial CBN. The simultaneous existence of these two materials plays a complementary role, covering the processing of various new materials currently and in the future and is extremely beneficial to the entire field of cutting.