Patent ID: 10751804

Abstract:
At least a (Al1-a-b-cCraSibCuc)N (where 0.15≤a≤0.40, 0.05≤b≤0.20, and 0.005≤c≤0.05) layer is provided on a surface of a tool body, a Cr concentration or a Cu concentration periodically changes in a layer thickness direction, a concentration Crmax in a highest content point of Cr is in a range of a<Crmax≤1.3a, a concentration Crmin in a lowest content point of Cr is in a range of 0.50a≤Crmin<a, and optionally in a case where a Cu composition at one point z along the layer thickness direction is represented by cz and a Cr composition at the point z is represented by az, (cz/az)/(c/a) is 0.7 to 1.5 over the layer thickness direction entirely.