| 摘要 |
PROBLEM TO BE SOLVED: To improve surface lubrication relating to chips. SOLUTION: This surface coating hard metal-made cutting tool, formed by chemically evaporating and/or physically evaporating in a mean layer thickness of 3 to 30μm a hard coating layer constituted by a lower layer of a Ti compound layer consisting of one or two or more kinds of basically layers of TiC, TiN, TiCN, TiCO, or TiCNO and an upper layer of Al2O3 layer on a surface of a WC group sintered hard metal base body, has a mean layer thickness of 0.1 to 3μm thickness as the most surface bedding layer in addition to the hard coating layer. In the case of representing by compositional formula TiOv, the tool has a Ti oxide layer satisfying V: 1.2 to 1.7 by atomic ratio relating to Ti and a mean layer thickness of 0.05 to 2μm similarly as the most surface layer, and in the case of representing by compositional formula TiCxNy(O)z (where (O) represents diffusion oxygen from the most surface bedding layer) the tool is formed by chemically evaporating and/or physically evaporating a Ti carbonitroxide layer satisfying X: 0.25 to 0.65, Y: 0.25 to 0.65, z: 0.01 to 0.4, x+y+z=1 by atomic ratio respectively relating to Ti.
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