FORGING METHOD, MOLDING DEVICE FOR FORGINGS, AND TRIPOD UNIFORM MOTION UNIVERSAL JOINT

摘要

Provided are a forging method that can reduce die wear and can avoid elevation of processing load due to contact between the shank tip surface and the dies and improve mold life even when raw materials of excessive weight are intermixed, a molding device for forgings, and a tripod uniform motion universal joint. After molding of a preform (20A) as a material, the preform (20A) is placed in a closed forging mold (30) and a product is molded in the closed forging mold (30). On the prepared tip surface that makes up the tip surface (17a) of the shank (17) of the product in the preform (20A), a die wear-suppressing part (65) for suppressing thickness reduction in the outer perimeter of the tip surface (17a) of the shank (17) of the product (16) is formed. When the preform (20A) is placed in the closed forging mold (30) and the product (16) is molded, a clearance (26) is formed between the tip surface (17a) of the shank (17) that is being molded and the cavity (24) in the closed forging mold (30).