The hard enveloping layer intermittence the surface canning thermet make cutting tool null tungsten carbide basis which shows the resistance blade tipping Characteristic which is superior

摘要

PROBLEM TO BE SOLVED: To provide a surface coated thermet-made cutting tool having a hard coating layer exhibiting excellent chipping resistance in intermittent heavy cutting.;SOLUTION: In this surface coated thermet-made cutting tool, a hard coating layer is vapor-depositioned on the surface of a tool base made of WC-base cemented carbide or TiCN-base thermet. The hard coating layer has a (Ti, Al)N layer, which satisfies the composition formula: (Ti_1-XAl_X)N (wherein X indicates 0.45 to 0.70 by atomic ratio), shows a specified inclination angle frequency distribution graph when electron beams are applied to individual crystal grains having a cubic crystal lattice existing within a measurement range of surface polishing surface using a field emission type scan electronic microscope to measure an angle of inclination made by normal of [100] face which is a crystal face of the crystal grain to the normal of the surface polishing surface, and has an average layer thickness of 2 to 15μm.;COPYRIGHT: (C)2006,JPO&NCIPI