| 摘要 |
PURPOSE:To reduce production cost by casting a socket integrally to enclose a ball part, then exerting external force to the outside wall of the socket via plural rolling rolls. CONSTITUTION:A release agent is coated on the surface of a ball stud 1 having a screw part 4 for mounting and is set in a lower metallic mold 12. An upper metallic mold is then put thereon and a molten metal for forming the socket is poured into the mold to integrate a stock body 20 of the socket 5 and the stud 1. The rolls 31, 32, 33 are disposed to the point of the stud 1 corresponding to the max. diameter part of the ball part 2 and are rotated to exert compressive force to the outside wall of the stock body 20 of the socket. The stock body 20 and the ball part 2 are stripped by the deformation force. The stock body 20 constitutes the slidable socket 5. Lubricating oil is injected into a spacing 7 to form an oil film and the product is thus obtd. The production cost is greatly reduced by the simplified stages and the decreased number of parts. |
