CBN, also known as cubic boron nitride, is a super-hard inorganic material made of hexagonal boron nitride through high temperature and high pressure polycrystalline. It is mainly used to make abrasive tools and cutting tools, and can be used to process high hardness. Hard-to-machine materials such as heat-resistant alloys, hardened steel, high-hard cast iron, and tool steel.

　　CBN tools not only have extremely high hardness similar to diamond, but also have more valuable properties than diamond, that is, they do not oxidize at high temperatures and are more chemically inert than ferrous metals. Therefore, CBN tools can process high-strength and high-temperature materials. Not only is the efficiency high, the quality is good, but the tools are durable and economical.

　　For example, in recent years, as long as the tool is used for turning instead of grinding and milling instead of grinding, the first thing that comes to mind must be CBN tools. Because the hardness of CBN powder can reach HV8000~9000, the heat resistance can reach 1400℃~1500℃, the hardness at 800℃ is higher than the normal temperature hardness of ceramics and cemented carbide, so it can be 3 higher than cemented carbide tools. ~5 times the speed for cutting.

　　In addition, the adhesion of CBN tools to various materials and the diffusion effect at high temperatures are much smaller than those of cemented carbide tools. The thermal conductivity is also more than 20 times higher than that of cemented carbide. Will be enhanced. In addition, the coefficient of friction between CBN and different materials is only 0.1~0.3 (0.4~0.6 for cemented carbide), and the friction coefficient will decrease with the increase of cutting speed, so the precision of the machined surface is higher.

　　In addition, although the price of CBN tools is more expensive than that of cemented carbide tools, because of the high cutting speed of CBN tools, the processing time is greatly shortened. At the same time, the tool life is relatively long and the product quality is also improved. Therefore, the overall Calculated, CBN tools may be more economical than cemented carbide tools.

　　Of course, you can’t choose CBN tools blindly, but you should also evaluate them according to the actual processing conditions, and comprehensively weigh the workpiece material, production volume, processing time, machine tool and tool performance and other factors to ensure the processing quality. Under the premise, choose a tool suitable for your own processing.