SURFACE-COATED CERMET CUTTING TOOL WITH HARD COATING LAYER EXHIBITING SUPERIOR ABRASION RESISTANCE IN HIGH SPEED CUTTING WORK OF HARD-TO-CUT MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a surface-coated cermet cutting tool with a hard coating layer exhibiting superior abrasion resistance by high speed cutting work of a hardly cuttable material.;SOLUTION: This surface-coated cermet cutting tool is formed by physically depositing the hard coating layer having a structure of dispersively distributing a chromium nitride phase at a rate of 0.3 to 10 area % in a cross-sectional analysis by an Auger spectral analysis device on a basis material composed of composite nitride of Al, Ti and B, having the basis material having a component concentration distribution structure for allowing a Ti maximum and minimum inclusion points to alternately and repeatedly exist at a predetermined interval in the layer thickness direction and continuously changing in an inclusion rate of Al and Ti to the minimum inclusion point from the Ti maximum inclusion point and also in the inverse direction, allowing the Ti maximum and minimum inclusion points to respectively satisfy a specific composition formula, and setting an interval between the adjacent Ti maximum inclusion point and Ti minimum inclusion point to 0.01 to 0.1 μm, in the average layer thickness of 1 to 15 μm, on a surface of a tungsten carbide group cermet base body or a titanium carbonitride-based cermet base body.;COPYRIGHT: (C)2006,JPO&NCIPI