Tool coating technology has made great progress in recent years, surface coating has become a key technology to improve tool performance. Chemical vapor deposition (CVD) is still the main coating process for indexable inserts, and new techniques such as intermediate temperature CVD, thick film Al2O3, transition layers have been developed to improve the wear resistance of CVD coatings on the basis of improving the properties of matrix materials Sexual and toughness have been significantly improved. CVD diamond coating has also made great progress, improve the coating surface quality, and enter the practical stage. At present, foreign carbide indexable blade coating ratio has reached about 75%. In the meantime, the progress of physical vapor deposition (PVD) coating technology is particularly noticeable in the coating furnace structure, process, automatic control technology has made new progress, not only for the development of high-speed cutting, dry cutting , Hard cutting of high heat resistance coatings (such as super TiAlN) and the overall performance of the TiAlCN universal coating and DLC, W / C anti-friction coating, and through the coating structure innovation, the development of nano, Layer structure coating, a significant increase in the coating hardness and toughness.