CBN has high hardness, chemical inertness and thermal stability at high temperatures, so it is widely used in abrasive grinding CBN grinding wheel. Because of its superior properties to other tool materials, CBN has been attempting to apply it to cutting from the very beginning, but single-crystal CBN particles are so small that it is difficult to make a tool and the CBN has poor sinterability and is difficult to make Large CBN sintered body, until the 1970s, the Soviet Union, China, the United States, Britain and other countries have successfully developed CBN sintered body as a cutting tool – polycrystalline cubic boron nitride PCBN (Polycrystalline Cubic Boron Nitride). Since then, PCBN with its superior cutting performance used in all areas of cutting, especially in high hardness materials, difficult machining of materials cutting is more unique. After more than 30 years of development and application, PCBN tooling materials for processing different materials have now emerged.

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