Die production manner for worm wheel gear formation and die for worm wheel gear formation

摘要

P To obtain a method of manufacturing a mold capable of highly accurately resin molding and capable of easily extracting a molded worm wheel gear. PSOLUTION: In the first machining step and a gear area molding part 20G corresponding to a gear area of the worm wheel gear is machined by a tool 30 inserted from the first opening A1 of a mold material 20M. In the second machining step and a helical area molding part 20H corresponding to a helical area continuously provided in a face width direction of the gear area is machined by the tool 30 inserted from the second opening A2 of the mold material 20M. PCOPYRIGHT: (C)2009 and JPO& INPIT