| 摘要 |
PROBLEM TO BE SOLVED: To extend the life of a hard film coated cutting tool by reducing residual compressive stress while maintaining high hardness which improve adhesion strength of hard film layers 1, 2 constituting a double layer structure. SOLUTION: In the hard film coated cutting tool including cemented carbide as a base material coated with a hard film, the front surface side is coated with the hard film layer 1 and the base material side is coated with the hard film layer 2. The hard film layer 1 comprises (Al<SB>a</SB>Cr<SB>1-a</SB>)N<SB>x</SB>wherein 0.5≤a≤0.75 and 0.9≤x≤1.1, and the hard film layer 2 comprises (Ti<SB>b</SB>Al<SB>1-b</SB>)N<SB>y</SB>wherein 0.4≤b≤0.6 and 0.9≤y≤1.1. When a lattice constant of (111) surface of the hard film layer 1 in the X-ray diffraction is a1 (nm), and a lattice constant of (111) surface of the hard film layer 2 is a2 (nm), the hard film layers 1 and 2 satisfy the formula 1.005≤a2/a1≤1.025. COPYRIGHT: (C)2011,JPO&INPIT
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