With the rapid development of manufacturing technology, cutting processing, as the basic process of manufacturing technology, has entered a new stage of development characterized by the development of efficient cutting, the development of new cutting processes and processing methods, and the provision of complete sets of technology. At the same time, the development of manufacturing technology and difficult-to-machine materials is driving the development of tool technology, and tool technology is also developing in the direction of high-speed cutting, high-speed cutting, high-precision and dry machining. The application of super-hard tools that can achieve high efficiency, high stability and long-life processing is also becoming more and more popular, playing an important role in the fields of automobiles, aerospace, energy, military, and molds. In machining, tool material is one of the key factors determining the processing efficiency, processing quality and processing cost. It is important to select and apply the tool material correctly. Modern tool materials are mainly high-speed steel, cemented carbide and ceramics. Their main hard phase components are carbides, nitrides and oxides. After bonding materials, the hardness of the tools is below HV2000. For the processing of some modern difficult-to-machine materials, the above hardness can not meet the requirements, so super-hard tool materials came into being. PCBN (polycrystalline cubic boron nitride) tools, ceramic tools, coated tools, etc. have high hardness, wear resistance and chemical stability, and can meet the requirements of high-speed cutting, dry cutting, hard cutting and other green manufacturing. . Due to the unparalleled superiority of PCBN tools in machining precision, cutting efficiency and tool life, the promotion and application of PCBN tools can create huge economic benefits. This paper mainly describes the manufacturing methods, physical properties, applications and new developments of CBN tool materials, and looks forward to the future development of PCBN tools in the 21st century. CBN tool material manufacturing method Cubic Boron Nitride was first synthesized by American General Electric (GE) under high temperature and high pressure conditions in the 1950s. Its hardness is HV8000, which is second only to diamond (HV10000). Higher than other materials, it is collectively referred to as superhard material. Both CBN crystal and diamond crystal belong to the zinc blende type, and the lattice constant is similar, and the chemical bond type is the same. Therefore, CBN has the hardness and compressive strength close to diamond, and because it is composed of N and B atoms, it has more than diamond. High thermal stability and chemical inertness. The manufacturing method of CBN tool material is mainly hot pressing method. The raw material for pressing CBN single crystal powder, hexagonal boron nitride powder (HBN), is placed in the cavity of pyrophyllite, plus catalyst, with six-sided top or The hydraulic machine on both sides is heated at 1600 ° C and 5~6 GPa for 10 min to form CBN single crystal powder. Single crystal powder can be used for abrasives and abrasive tools. Using CBN single crystal powder plus catalyst and binder, press 1800 ° C, 5 ~ 6GPa for another 3min to get PCBN whole blade or composite blade (hard alloy bottom, with a thin CBN layer of about 0.5mm) . PCBN tool material performance (1) It has high hardness and wear resistance. The microhardness of CBN single crystal is HV8000~HV9000, which is the second highest hardness material known at present. The hardness of PCBN tool materials with different amounts of binder is between HV4000 and 6000, while the hardness of cemented carbide tool materials is only HV1100~1800; the hardness of Al2O3 ceramic tool materials is HV2000. It can be seen that it is used to process high hardness materials. PCBN tools have higher wear resistance than cemented carbide and ceramics, which can reduce the dimensional deviation or dimensional dispersion in the processing of large parts, reduce the tool-assisting time of the tool change, and make full effect. Next page 3-Pc Flange Ball Valve,Threaded 3-Pc Ball Valve,3-Pc Ball Valves Antai Magnet Co., Ltd. , http://www.buxiugangvalve.com