| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface coated cutting tool having a hard coating layer showing superior chipping resistance and wear resistance in high speed heavy cutting of high hardness steel. SOLUTION: The surface coated cutting tool has a composition variable (Al, Cr, Ti, Si) N layer coated on the surface of a tool base body made of tungsten carbide base cemented carbide or titanium carbonitride base cermet, The mean thickness of the composition variable (Al, Cr, Ti, Si) N layer is within the range from 1 to 8μm, and a maximum containing point of Al-Cr and a maximum containing point of Ti-Si alternately exist at a specified interval in the direction of the layer thickness. The content rates of Al, Cr, Ti, and Si at the maximum containing points of Al-Cr are 0.35 to 0.50, 0.15 to 0.35, 0.25 to 0.45, and 0.03 to 0.10 respectively, and the content rates of Al, Cr, Ti, and Si at the maximum containing points of Ti-Si are 0.10 to 0.25, 0.10 to 0.25, 0.50 to 0.70, and 0.10 to 0.25 respectively. COPYRIGHT: (C)2008,JPO&INPIT
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