COATED CUTTING TOOL

摘要

The present invention relates to a coated cutting tool (1) including a substrate (8) and a coating (9) formed on the substrate (8), wherein the coating (9) includes a first coating (10) composed of TiCN and a second coating (11) composed of ±-Al 2 O 3 , the first coating (10) is positioned between the substrate (8) and the second coating (11) and has tensile stress S1, the second coating (11) has compressive stress S2, and the tensile stress S1 and the compressive stress S2 are defined by the following equation (I): 400 �¢ MPa ‰ S �¢ 2 - S �¢ 1 ‰ 3500 �¢ MPa