CBN SINTERED BODY FOR HIGH SURFACE INTEGRITY MACHINING AND CBN SINTERED BODY CUTTING TOOL

摘要

In high efficiency cutting of very hard and hard-to-cutferrous materials, compared with conventional cBN sinteredbody tools, the fatigue life of the machined part is improvedand a longer lasting tool is provided by controlling theproduction of the affected layer by machining formed on themachined surface of the workpiece to be cut and by promotingresidual of compression stress.The cBN sintered body related to the present inventionhas not less than 60% and not more than 95% of cBN componentsin volume, and has a thermal conductivity of 70 W/m.cndot.K ormore; and the outermost surface thereof is coated with a heatresistant film comprising a compound of at least one elementselected from 4a, 5a, 6a group elements and Al, and at leastone element selected from C, N and O.