surface-coated cermet cutting tool with a hard coating layer exhibits chipping resistance and wear resistance with excellent high-speed interrupted cutting

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cermet cutting tool having a hard coated layer exhibiting excellent chipping resistance and wear resistance in high speed intermittent cutting.;SOLUTION: This cutting tool has the hard coated layer constituted of a lower part layer of a Ti compound layer and an upper part layer of (Al,Cr)₂O₃ layer. In the lower part layer, a reformed WC layer is interposed as an interlayer interposed layer. The upper part layer is constituted of a reformed (Al,Cr)₂O₃ layer showing a constituent atom shared lattice point distribution graph having a maximum peak existing at Σ3 and a distribution rate of the Σ3 occupied in the whole of ΣN+1 of ≥60% when irradiating each of crystal grains having a hexagonal crystal lattice existing in a measured range of a surface polishing surface with an electron beam by using a field emission type scanning electronic microscope, measuring an inclination formed by normals of a (0001) surface and a surface (10-10) which are crystal surfaces of the crystal grains in relation to a normal of the surface polishing surface, and preparing the constituent atom shared lattice point distribution graph from the measured value.;COPYRIGHT: (C)2008,JPO&INPIT