Method for polishing diamond-coated film, diamond-coated cutting tool, and method for producing diamond-coated cutting tool

摘要

PPROBLEM TO BE SOLVED: To provide a diamond coated cutting tool having an idiomorphic face by cluster ion beam and a smoothed surface of a diamond coated film exceeding a maximum height of l m in 10 m square, with low cutting resistance, superior chip discharging property and good sharpness in cutting, and a method for manufacturing the diamond coated cutting tool. PSOLUTION: After a polycrystal diamond coated film 4 formed by a CVD method and having the maximum height of 1 m in 10 m square in an atomic force microscopic observation image is formed on a cemented carbide substrate, a vertical surface 7 of the diamond coated film 4 is irradiated with gas cluster ion beam 1 with an incident angle of more than 60 and less than 80, a plurality of parallel grooves (polishing marks) 2 having at least a longitudinal direction length of 5 m are formed, and polishing is performed with the maximum height of 0.5 m in 10 m square or center line average roughness of 0.1 m. A flank 13 or a rake face 11 of a cutting blade 12 of the cemented carbide cutting tool substrate is smoothed. Further, a round radius of a cutting blade 12' is made 10 m. PCOPYRIGHT: (C)2010,JPO&INPIT