| 摘要 |
PROBLEM TO BE SOLVED: To provide a forming method for an internal gear using internal stress generated by cold plastic forming to enable enhancement in both the strength of a forming material and the process yield of the forming material for use, as well as tooth the flank accuracy of the formed internal gear teeth. SOLUTION: The internal gear forming method moves a forming roller F3 along a forming die F1 having gear teeth on its outer circumference, while rotating the forming material W tightly-held between the forming die F1 and a holding member, to cut and form the forming material W into a cup-shaped internal gear W0 containing internal gear teeth 1H. Dummy gearteeth are prominently-formed in an nearly central position on a teeth-shape recessed area for forming the internal teeth on the forming material W of the forming die F1, allowing the stuff of the forming material W to laterally be moved towards the side of the internal teeth 1H. COPYRIGHT: (C)2003,JPO
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