SURFACE-COATED CEMENTED CARBIDE CUTTING TOOL WITH HARD COAT LAYER EXHIBITING EXCELLENT WEAR RESISTANCE UNDER HIGH-SPEED COUBLE CUTTING CONDITION

摘要

PROBLEM TO BE SOLVED: To provide a surface-coated cemented carbide cutting tool having a hard coat layer exhibiting excellent wear resistance under a high-speed double cutting condition. SOLUTION: This surface-coated cemented carbide cutting tool comprises the hard coat layer consisting of a composite nitride of Al, Ti and Hf, which is physically evaporated on the surface of a tungsten carbide-group carbide base body or titanium carbide nitride-based cermet base body in an overall average layer thickness of 1-15μm. The hard coat layer is constituted by a hard coat layer having a component concentration distribution structure in which Al and Ti highest content points are alternately repeatedly present at prescribed intervals, and the Al and Ti contents are continuously changed from Al to the Ti highest content or from Ti to the Al highest content. Further, the Al and Ti highest content points satisfy composition formulae (Al1-(X+Y)XHfY)N and (Ti1-(Z+Y)AlZHfY)N, respectively, and the space between the adjacent Al and Ti highest content point is 0.01-0.1μm. COPYRIGHT: (C)2004,JPO