The hard enveloping layer high speed the surface canning cutting tool null tungsten carbide basis which shows the resistance blade tipping Characteristic which is superior heavily

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cutting tool having a hard coating layer capable of achieving excellent chipping resistance in high-speed heavy cutting.;SOLUTION: In this surface coated cutting tool, the surface of the tool substrate including WC-base cemented carbide and TiCN-base cermet is provided with: (a) a Ti compound layer as a lower layer; (b) a compound carbonitroxide layer of Ti, AI and Zr for satisfying a specific composition formula as a middle layer; and (c) a compound oxide layer of AI and Cr having an α type crystal structure in a chemical vapor deposition state for satisfying a specific composition formula as an upper layer. Further, the upper layer includes a compound oxide layer of AI and Zr for showing a specific constituent atom covalent lattice point distribution graph obtained by irradiating each of crystal grains having hexagonal crystal lattice that exists in the measurement range of a surface polishing face with an electron beam to measure an inclined angle made by normals of a (0001) face and a (10-10) face, the crystal faces of crystal grains, in relation to the normal of the surface polishing face.;COPYRIGHT: (C)2008,JPO&INPIT