R&J CBN inserts, or cubic boron nitride inserts, are high-performance cutting tools that are widely used in the machining of a variety of high hardness materials. Such as hardened steel, cast iron, wear-resistant cast iron and so on. Especially when machining hardened steel above 50HRC, CBN tools can perform roughing and semi-finishing machining to improve machining efficiency and quality. In addition, CBN tools are also suitable for the machining of automotive parts, molds, bearings and other high-precision parts.

High hardness and wear resistance: The hardness of CBN inserts is second only to diamond, and the grain hardness can reach HV8000~9000, which is much higher than that of cemented carbide and ceramics. This makes it excellent in machining high hardness materials and significantly improves tool life and machining efficiency.

High thermal stability: CBN inserts can remain stable at a high temperature of 1200~1400℃, which is suitable for high-speed cutting and heavy-duty machining. Its heat resistance is double that of diamond, and it can maintain excellent cutting performance at high temperatures12.

Good chemical stability: CBN inserts do not react chemically with ferrous materials at high temperatures, which makes them suitable for machining hardened steel, cast iron and other difficult-to-machine materials and ensures that there will be no sharp wear in the machining process12.

Low coefficient of friction: the coefficient of friction of CBN inserts is between 0.1 and 0.3, much smaller than that of cemented carbide, which is conducive to improving the quality of machined surfaces1.

Excellent thermal conductivity: CBN inserts have a high coefficient of thermal conductivity, which gradually increases with the increase of cutting temperature, which is favorable for the temperature diffusion of the tool in the cutting zone of the tip and reduces thermal damage12.