SURFACE COATED CUTTING TOOL

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cutting tool which can allow a hard coating layer to exert excellent chipping resistance and abrasion resistance in the high-speed intermittent machining of steel, cast iron or the like. SOLUTION: The surface coated cutting tool includes a tool base formed of a WC cemented carbide alloy or a TiCN-base cermet. (a) A lower layer and (b) an upper layer are vapor-deposited as hard coating layers on the surface of the tool base. The lower layer includes a Ti compound layer that includes one or more layers selected from a TiC layer, a TiN layer, a TiCN layer, a TiCO layer, and a TiCNO layer and has a total average layer thickness of 3 to 15μm. The upper layer has a structure alternately stacked with a TiC layer having an average layer thickness of 0.2 to 1μm and having a vertically-longitudinal grown microparticulate crystal structure and an Al2O3layer having an average layer thickness of 0.5 to 3μm and has a total average layer thickness of 3 to 15μm. COPYRIGHT: (C)2011,JPO&INPIT