PURPOSE: To improve the adhesion of an artificial diamond film to the surface of a WC hard alloy body by coating the surface of a tungsten carbide group hard alloy substrate formed with face split grooves on the rake face of a cutting edge with the artificial diamond film.
CONSTITUTION: Area split grooves 3, 4 preferably having the upper edge width of about 0.2-2mm and the depth of about 0.2-2μm in size that the split small areas do not affect an artificial diamond film to be formed are formed on the rake face 1 of the cutting edge of a WC group hard alloy substrate or on the rake face 1 and a flank 2. The split small areas on the rake face 1 of the cutting edge or on the rake face 1 and the flank 2 are coated with the artificial diamond film. The adhesive strength of the artificial diamond film is improved as the coated area is reduced.
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OKAMURA TOSHIHIKO
SAKURAI KEIICHI
