The face and the flank which include the cutting blade edge section of the tip/chip base substance which the surface grinding mannered null tungsten carbide basis of the surface canning thermet make

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.;SOLUTION: In the coated cutting tip having a hard coating layer which is composed of a lower Ti-compound layer and an upper α-type Al₂O₃ layer and is formed by vapor deposition on the surface of a tip base body, an abrasive layer composed of a carbo-nitride metal layer comprising any one layer of a CrCN layer, an HfCN layer, a ZrCN layer, and a VCN layer, all of the layers having a mean layer thickness of 0.5 to 5 μm, is formed by vapor deposition over the whole surface of the upper α-type Al₂O₃ layer. After that, the polishing fluid mixed with fine particles of jetting abrasive of Al₂O₃ is jetted by wet blasting in order to polish the surface of the upper α-type Al₂O₃ layer leaving the abrasive layer around a tool mounting hole intact so as to achieve a surface roughness Ra of 0.2 μm or less.;COPYRIGHT: (C)2007,JPO&INPIT