| 摘要 |
PURPOSE:To prevent a material to be worked from generating seizure by using a ceramic material for a die main body and protecting the die main body by press-bonding a steel material to its whole circumference. CONSTITUTION:A die main body 18 is formed by using ceramic material and a die holder 13 is shrinkage fitted to its outer circumference 19. In working a blank material 11 by the die, the seizure between them is hardly generated, because the round corner part 20 and side wall part 21 of the die main body 18, where the most violent working resistances are required, are constituted of a ceramic material which is nonmetallic and the affinity between the materials is remarkably small. The ceramic material used for this purpose is excellent in hardness and wear-resisting properties. |
