| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface coated cutting tool base material having excellent oxidation resistance, heat resistance and abrasion resistance, and capable of stably executing the dry machining of steel and high-speed machining of high-strength material for a long time by improving a coating film formed on a surface of the surface coated cutting tool base material. SOLUTION: An Al-Cr-N coating film with a crystalline structure thereof being a NaCl type structure and expressed by general formula for the (Al<SB>x</SB>, Cr<SB>1-x</SB>)N (where x satisfies the condition of 0.55≤x≤0.75), and an Al-Cr-Ti-N coating film with a crystalline structure thereof being a NaCl type structure and expressed by general formula for the (Al<SB>y</SB>, Cr<SB>1-y-z</SB>, Ti<SB>z</SB>)N (where y and z satisfy the conditions of 0.55≤y≤0.75, 0.2≤z≤0.3, 0.05≤1-y-z≤0.2) are alternately layered on a surface of a surface coated cutting tool base material. COPYRIGHT: (C)2010,JPO&INPIT
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