| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing an outer ring member for a constant velocity joint capable of enhancing the machining accuracy with the substantially uniform dimension of an end face thereof in the axial direction. SOLUTION: In this method, a forward extrusion (S1) is performed on a work, and a preliminary upset is performed on the work to form a primary shaped article (S2). By upsetting an upper portion of the primary shaped article, an intermediate preliminary shaped article having an annular inclined surface with a uniform angle of inclination formed between a large diameter portion and a small diameter portion is formed (S3). By performing backward extrusion on the intermediate preliminary shaped article, a quaternary shaped article having a cup part with a track groove formed therein is formed (S4), and the cup part of the quaternary shaped article is ironed for the finish to the product dimension. COPYRIGHT: (C)2005,JPO&NCIPI
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