DIE FOR COLD FORGING EXCELLENT IN WEAR RESISTANCE

摘要

PROBLEM TO BE SOLVED: To obtain the sufficient wear resistance to keep up with a forging of a difficult-to-working material without forming a film on the surface of the forming part of a die, consequently, without generating the detachment of the film. ;SOLUTION: This die applies the coating with an electric discharging machining by using a titanium as an electrode on the surface of the forming part 3 of the die D for cold-forging composed of a cemented carbide to form the hard film on the surface of the forming part 3, and also, forms a ceramic hardened layer 4 with a titanium permeation having about 3-5 micron in the inner part of the cemented carbide material in the forming part 3. Thereafter, the coating hard film 5 on the surface of the forming part is removed.;COPYRIGHT: (C)2000,JPO