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Introduction to the Materials and Applications of CBN Cutting Tools
Release date:
2026-05-09
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In recent years, whenever turning is used to replace grinding or milling to replace grinding, CBN tools are invariably the first choice. This is because CBN micro‑powder boasts a hardness of 8,000–9,000 HV and excellent thermal stability up to 1,400–1,500°C; at 800°C, its hardness even exceeds the room‑temperature hardness of ceramics and cemented carbides. Consequently, it enables cutting operations at speeds 3–5 times higher than those achievable with conventional cemented carbide tools.
CBN cutting tools not only exhibit extremely high hardness comparable to that of diamond, but also possess even more valuable properties—namely, resistance to oxidation at elevated temperatures and superior chemical inertness toward ferrous metals. Consequently, CBN tools are well suited for machining high-strength, heat-resistant materials, delivering high productivity, excellent surface quality, and long tool life, thereby offering enhanced cost-effectiveness.
CBN, or cubic boron nitride, is an ultra‑hard inorganic material produced by high‑temperature, high‑pressure polycrystallization of hexagonal boron nitride. It is primarily used to manufacture abrasives and cutting tools, capable of machining difficult-to-cut materials such as high‑hardness, heat‑resistant alloys, quenched steels, high‑carbon cast irons, and tool steels.
Although CBN cutting tools are relatively more expensive than carbide tools, their high cutting speeds significantly reduce machining time. Moreover, CBN tools offer longer tool life and improved product quality, so when all factors are considered, they may ultimately prove more cost‑effective than carbide tools.
CBN cutting tools exhibit significantly lower adhesion to various workpiece materials and much less diffusion at elevated temperatures compared with cemented carbide tools. Their thermal conductivity is more than 20 times higher than that of cemented carbide, and it further improves as the temperature rises. Moreover, the coefficient of friction between CBN and different materials ranges only from 0.1 to 0.3 (compared with 0.4 to 0.6 for cemented carbide), and this value decreases with increasing cutting speed, resulting in superior surface finish.
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2021-11-11
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