SURFACE-COATED CUTTING TOOL EXHIBITING SUPERIOR CHIPPING RESISTANCE, PEELING RESISTANCE AND WEARING RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a surface-coated cutting tool having an excellent hard coating layer which exhibits superior chipping resistance, peeling resistance and wearing resistance in high speed intermittent cutting of carbon steel, stainless steel and the like.;SOLUTION: There is provided a surface-coated cutting tool in which a substrate layer is formed on the surface of a tool base, and furthermore, the substrate layer is covered with an Al₂O₃ hard coating layer comprising a lower layer and an upper layer. In the surface-coated cutting tool, the lower layer comprises a crystalline Al₂O₃ layer and the upper layer comprises a non-crystalline SiO₂ layer, the lower layer has recessed parts formed therein, and the non-crystalline SiO₂ layer of the upper layer is subjected to filling film deposition to fill the recessed parts, an average depth of the recessed parts is 0.5-10.0 μm, an average aspect ratio of the recessed parts is 1.0-40, and an average horizontal spacing between the recessed parts is 0.5-15 μm.;COPYRIGHT: (C)2013,JPO&INPIT