CBN tool also known as cubic boron nitride cutting tool 1, the main processing hardened steel, hard alloy or cast iron, CBN is a second only to diamond hard tool materials, usually when the material hardness is greater than 48HRC work best ( processing soft material CBN wear out quickly ). High temperature to 2000 DEG C is also good red hardness, processing workpiece hardness required in 48HRC above; 2, advantages: the use of CBN tool, can greatly reduce the number of changing knife and tool wear, compensation for the time spent, the high-performance CNC machine tools more fully, so that it can in a numerical control machine tools on the quenched turning ( by turning instead of grinding ), and can be repeated grinding using.