PRESS DIE AND METHOD FOR TREATING SURFACE OF PRESS DIE

摘要

A die having a good abrasion resistance even at a cutting side face (104) including a die hole inner circumferential face and a long life and not inviting an increase in deform of a press-formed article due to the wear of the cutting side face after a long use by forming, on a cutting side face (104), a modified layer (108) of an electrode wear fused substance of a discharge electrode (15) produced by electric discharge energy of submerged electric discharge machining or of reaction products of the electrode wear fused substance.