SURFACE COATED CEMENTED CARBIDE CUTTING TOOL HAVING HARD COATED LAYER EXHIBITING SUPERIOR ABRASION RESISTANCE UNDER HIGH SPEED CUTTING CONDITION

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cemented carbide cutting tool having a hard coated layer exhibiting superior abrasion resistance under high speed cutting conditions. SOLUTION: This surface coated cemented carbide cutting tool is so formed that the hard coated layer composed of a complex carbonitride layer of Zr and Ti of 1-15μm in the whole average layer thickness is vapor-deposited on the surface of a cemented carbide base. The hard coated layer is so constituted that a Zr and carbon maximum containing point and a Zr and carbon minimum containing point are alternately and repeatedly present at prescribed intervals along the layer thickness direction. The hard coated layer has a component concentration distribution structure wherein the content of the Zr and Ti and the content of the carbon and nitrogen are continuously changed between the both points, the Zr and carbon maximum containing point satisfies Zr/(Zr+Ti):0.80-0.98 in an atom ratio and carbon/(carbon + nitrogen): 0.80-0.98, the Zr and carbon minimum containing point satisfies Zr/(Zr+Ti):0.40-0.60 in the atom ratio and carbon/(carbon + nitrogen): 0.40-0.60, and the interval between the adjoining both points is set to become 0.01-0.2μm. COPYRIGHT: (C)2004,JPO