The surface canning thermet make cutting throwaway tip null tungsten carbide basis which shows the resistance blade tipping Characteristic where the hard enveloping layer is superior in high-speed

摘要

PROBLEM TO BE SOLVED: To provide a coated cutting tip having a hard coating layer exhibiting excellent chipping resistance in high-speed cutting material hard to work.;SOLUTION: In this cutting tool, an Al₂O₃ layer of the hard coating layer is formed by a reformed Al₂O₃ layer. The reformed Al₂O₃ layer is such that when with a field emission type scanning electron microscope, an electron beam is applied to the individual crystal grains existing in a measurement range of the surface polishing side, inclination angles made by normals of (0001) face and (10-10) face, which are crystal planes of the crystal grain, are measured, and a component atom covalent lattice point distribution graph is created based on the obtained measured inclination angles, the reformed Al₂O₃ layer shows a component atom covalent lattice point distribution graph in which the highest peak exists in Σ3, and the distribution percentage of Σ3 occupying the total is 60% or more, and the surface of the reformed Al₂O₃ layer is polished to set the surface roughness to Ra: 0.2 μm or less. Further, a hard coating layer residual stress reducing pattern is formed on the polishing surface by irradiating a laser beam.;COPYRIGHT: (C)2007,JPO&INPIT