| 摘要 |
PROBLEM TO BE SOLVED: To provide an outer member for constant velocity universal joint excellent in a same axial degree and at the right angle degree between a shaft part and a cup part while avoiding as much as possible generating a core-shifting or an inclination between a punch and a die for forming the cup part at the forging-formation time. SOLUTION: An extrusion molding device in the cup-part 7 includes a lower die 11 having the die 13 and an upper die 12 having the punch 14. In these, the upper die 12 is provided with the punch 14 as an inner die and a slide part holding the punch 14 and inserting the punch 14 into the inner periphery of the die 13 by integrally descending with the punch 14. The slide part is provided with a spherical surface seat 22 and the spherical surface seat 22 is abutted with the punch 14 through a recessed spherical surface 25 and a projected spherical surface 26 mutually formed as supplemental shape. The recessed spherical surface 25 is formed as the spherical surface seat 22 and the projected spherical surface 26 is formed as the punch 14. The recessed spherical surface 25 and the projected spherical surface 26 are constituted so as to relatively be slidable. In other words, with the recessed spherical surface 25 and the projected spherical surface 26, a sliding part 27 slidable of the projected spherical surface 26 to the recessed spherical surface 25, is constituted. COPYRIGHT: (C)2008,JPO&INPIT
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