SURFACE COATED CEMENTED CARBIDE CUTTING TOOL WHOSE HARD COATING LAYER EXHIBITS CHIPPING RESISTANCE UNDER HIGH-SPEED HEAVY CUTTING CONDITION

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cemented carbide cutting tool whose hard coating layer exhibits superior chipping resistance under high-speed heavy cutting conditions. SOLUTION: This surface coated cemented carbide cutting tool is formed by vapor-depositing the hard coating layer having the whole average layer thickness of 5-25μm and composed of a composite oxide layer of Al and Ti on the surface of a cemented carbide base. The hard coating layer is provided with a component concentration distribution structure of alternately and repeatedly having Al maximum inclusion point and a Ti maximum inclusion point in the layer thickness direction and continuously changing the Al and Ti contents between the both points. The hard coating layer satisfies that Al/(Ti+Al) showing the mutual inclusion ratio of Al and Ti in the Al maximum inclusion point is 0.70-0.95 in atomic ratio and Ti/(Al+Ti) showing the mutual inclusion ratio of Ti and Al in the Ti maximum inclusion point is 0.70-0.95 in atomic ratio and that the interval between both the adjoining points is 0.01-0.2μm. COPYRIGHT: (C)2004,JPO