| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface coated cemented carbide cutting tool having a surface coating layer exhibiting excellent chipping resistance in high-speed heavy cutting. SOLUTION: The surface coated cemented carbide cutting tool has a cemented carbide body formed of a tungsten-carbide-based cemented carbide or a titanium-carbonitride-based cermet, and the surface coating layer consisting of (a) a complex nitride layer containing Ti, Al, and Si, as a lower layer, and (b) an amorphous carbon lubricant layer as an upper layer, on the surface of the body. (a) The complex nitride layer has a mean layer thickness of 1.5 to 10μm, and exhibits such a concentration distribution that maximum points of Al and Ti contents exist alternately and repeatedly at predetermined intervals along a layer thickness direction, and that the Al content and the Ti content continuously vary from the maximum point of Ti content and that of Al content, respectively. Further the maximum point of Al content satisfies a specific composition formula, and the interval between the maximum point of Al content and that of Ti content is in the range of 0.01 to 0.1μm. (b) The amorphous carbon lubricant layer has a mean layer thickness of 1 to 10μm. COPYRIGHT: (C)2006,JPO&NCIPI
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