SURFACE-COATED CUTTING TOOL WITH HARD COATING LAYER EXHIBITING EXCELLENT ABRASION RESISTANCE IN HIGH-SPEED CUTTING

摘要

PROBLEM TO BE SOLVED: To provide a surface-coated cutting tool with a hard coating layer exhibiting excellent abrasion resistance in high-speed cutting. SOLUTION: The surface-coated cutting tool has the hard coating layer comprising a lower layer made of (Ti, Al)N and an upper layer made of (Ti, Al, Si)N, which are vapor-deposited. The lower layer satisfies a composition formula: [Ti1-XAlX]N (wherein X is 0.40-0.60 by atomic ratio). The upper layer comprises an alternately-laminated structure of a thin layer A and a thin layer B. The thin layer A satisfies a composition formula: [Ti1-(E+F)AlESiF]N (wherein E is 0.10-0.14 and F is 0.20-0.25 by atomic ratio). The thin layer B satisfies a composition formula: [Ti1-(Q+R)AlQSiR]N (wherein Q is 0.35-0.40 and R is 0.05-0.10 by atomic ratio). COPYRIGHT: (C)2009,JPO&INPIT