Hard Turning the implementation process, cutting power (especially the radial force is greater than the main cutting force), high temperature cutting tool life is short, which requires the state to be as hard turning tool heat resistance and wear resistance better tool technology system must also have sufficient rigidity.

Tool material and geometry can be used as a tool Turning Hard materials cubic boron nitride (cbn), ceramics and new carbide. cbn has high hardness and wear resistance, hardness greater than hrc55 for machining hardened steel workpiece. Cost ceramic tool material is lower than cbn, and has good chemical thermal stability, hardness and wear resistance but not as good as cbn, the hardness is less than hrc50 hardened steel workpiece ceramic tool more appropriate choice. China's ceramic tool technology have been more perfect, more reliable performance blade, made al2o3, ceramic blade, nearly 20 varieties. Flexural strength and new carbide coated carbide tool materials and toughness than cbn and ceramic materials to be high, prices are low, can be used for machining hardened steel hardness of workpiece hrc40 ~ 50. Insert shape and tool geometry is reasonable or not choose, it is essential to give full play to the cutting tools. For blade for various materials, should choose high strength, heat dissipation good blade shape and the largest possible nose radius. The main features of the tool geometry parameters is to select a large negative rake angle or pre-milled negative chamfer.