SURFACE COATED CUBIC BORON NITRIDE SINTERED BODY TOOL

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cBN sintered body tool with excellent wear resistance in also a high speed cutting. SOLUTION: This tool is provided with a base material 2 having a part made of cBN sintered body having 20 volume % or more of cBN and a coating film 1 containing TiCN formed on the cBN sintered body of the base material 2. In a color tone of the coating film l, chromaticity a* (a red direction) is 0<=a*<=10, chromaticity b* (a yellow direction) is 0<=b*<=20 and brightness L* is 0<=L*<=100.