SURFACE COATED CEMENTED CARBIDE CUTTING TOOL WITH HARD COATING LAYER EXERCISING SUPERIOR CHIPPING RESISTANCE DURING HIGHLY EFFICIENT CUTTING

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cemented carbide cutting tool with a hard coating layer exercising superior chipping resistance during highly efficient cutting. ;SOLUTION: In a coated cemented carbide tool comprised by chemically and/or physically vapor-depositing a hard coating layer of an overall average layer thickness of 3 to 35 μm comprising a lower layer, a middle layer, and an upper layer on a surface of a WC base cemented carbide base substance, the lower layer is constituted by a Ti compound of an average thickness of 1 to 20 μm and the middle layer has a texture having an average thickness of 1 to 15 μm with K and ZrO2 distributed as a dispersed phase on a basis material of Al2O3. The upper layer is constituted by an outermost surface substrate layer represented by TiOX having an average thickness of 0.1 to 3 μm and an outermost surface layer comprising a Ti nitrogen oxide layer having an average thickness of 0.05 to 2 μm and represented by TiN1-Y(O)Y (in the formula, X represents 1.2 to 1.7 in atomic ratio in regard to Ti, and Y represents 0.01 to 0.4 in atomic ratio in regard to Ti).;COPYRIGHT: (C)2001,JPO