SURFACE COATED CEMENTED CARBIDE CUTTING TOOL HAVING CUTTING EDGE EXERTING EXCELLENT HEAT RESISTANT PLASTIC DEFORMATION IN HIGH-SPEED CUTTING

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cemented carbide cutting tool having a cutting edge exerting excellent heat resistant plastic deformation in high-speed cutting. SOLUTION: This surface coated cemented carbide cutting tool is made by forming a hard coating layer made of a multilayer with alternations of a first thin layer and a second thin layer having each of average layer thickness of 0.01 to 0.1μm with the whole average layer thickness of 0.8 to 10μm by vapor deposition on the surface of a tungsten carbide group cemented carbide base body. The first thin layer and the second thin layer are made of a titanium nitride layer and/or a titanium carbonitride layer and a hafnium oxide layer, respectively.