| 摘要 |
The present invention relates to a surface-coated cutting tool comprising a substrate and a coating formed on the substrate, the coating includes a first coating of TiCN and a second coating of alpha-type Al<SUB>2</SUB>O<SUB>3</SUB>, the first coating is located between the substrate and the aforementioned second coating, and the second coating has compressive stress S 1 in an area A 1 spreading from an insert ridge portion in the direction of a rake face and the direction of a flank face with distances of at least 0.5 mm respectively and has tensile stress S 2 in an area A 2 other than this area A 1 , while compressive stress S 1 and tensile stress S 2 are defined by the following expression (I): <?in-line-formulae description="In-line Formulae" end="lead"?>400 MPa<=|S1-S2|<=3500 MPa (I) <?in-line-formulae description="In-line Formulae" end="tail"?>
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