SURFACE COVERING CEMENTED CARBIDE CUTTING TOOL HAVING HARD COVERING LAYER EXHIBITING EXCELLENT CHIPPING RESISTANCE UNDER HIGH SPEED MULTIPLE CUTTING CONDITIONS

摘要

PROBLEM TO BE SOLVED: To provide a surface covering cemented carbide cutting tool exhibiting excellent chipping resistance under high speed multiple cutting conditions. SOLUTION: A hard covering layer made of a compound oxynitride layer of Al and Zr is deposited on the surface of a cemented substrate with a whole average layer thickness of 2 to 20μm to form a surface covering cemented carbide cutting tool. The hard covering layer has a component concentration distribution structure in which the highest content points of Al and oxygen and the highest content points of Zr, carbon and nitrogen are alternately and repeatedly existent at designated intervals, the contents of Al and oxygen and the contents of Zr, carbon and nitrogen are continuously varied between both points, and the interval between both adjacent points is 0.01 to 0.2μm. COPYRIGHT: (C)2004,JPO