Molding method for geared member with boss and geared member with boss

摘要

A method for molding a geared member with a boss, includes: (a) molding a boss portion by performing a backward extruding process for one end of a predetermined raw material; (b) molding a chamfer portion by performing a forward extruding process for the other end of said raw material; and (c) molding a gearing portion in which a plurality of teeth continuously from the chamfer portion toward the one end are molded by performing the forward extruding process for an extrusion residual area of the raw material having passed through the step (a) and (b). The predetermined raw material is constructed as the geared member with the boss in which the boss portion is molded at the one end and the gearing portion is molded continuously from the chamfer portion at the other end by passing through the steps (a)-(c)