SURFACE-COATED CEMENTED CARBIDE CUTTING TOOL CAPABLE OF DEMONSTRATING EXCELLENT WEAR RESISTANCE WHEN CUTTING HARDLY MACHINABLE MATERIAL AT HIGH SPEED

摘要

PROBLEM TO BE SOLVED: To provide a surface-coated cemented carbide cutting tool capable of demonstrating excellent wear resistance when cutting a hardly machinable material at a high speed. SOLUTION: In this surface-coated cemented carbide cutting tool, an oxidation resistant coated layer which has a mean layer thickness of 2-15μm, satisfies the composition formula (Al1-YTiY)N (where, Y is 0.05-0.25 in terms of atom ratio), and consists of an Al-based composite nitride layer having a cubic crystalline structure physically vapor-deposited on a surface of a tungsten carbide-based cemented carbide base body or carbo-nitride titanium cermet base body via a crystalline history layer which has a mean layer thickness of 0.05-1μm, satisfies the composition formula (Al1-XTiX)N (where, X is 0.40-0.65 in terms of atom ratio), and consists of an Al-Ti composite nitride layer similarly having the cubic crystalline structure. COPYRIGHT: (C)2003,JPO