| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a surface coated cutting tool in which a hard coated layer is excellent in deformation and exhibits superior wear resistance over a long-term use without causing abnormal damage such as peeling even in high-load cutting easily causing deformation of a tool base body due to a high load applied upon the cutting.SOLUTION: In a surface coated cutting tool, a lower layer comprising a Ti compound layer and an upper layer comprising anαtype AlOlayer are deposited and formed on the surface of a tool base body constituted with WC base super-hard alloy and TiCN base cermet. Therein, when a crystal orientation analysis of an upper layer longitudinal cross-section is performed and a weighing average angle of crystal orientation which is formed for a normal of a tool base body surface by a normal of (0001) plane of anαtype AlOcrystal grain is determined, the weighing average angleθfalls into the range of 7 to 15° in the region of a thickness from an interface with a lower layer to 1/2 of a layer thickness of an upper layer and the weighing average angleθfalls into the range of 2 to 10° in the region of a thickness from 1/2 of the layer thickness of the upper layer to the upper layer surface and, further, satisfies the relation ofθ>θ.</p> |
