| 摘要 |
PROBLEM TO BE SOLVED: To easily form a die for a crowning gear, and to forge the crowning gear by using this die. SOLUTION: A primary die (41) with internal teeth (41a) formed in a substantially equal gear thickness over the entire length is provided, a crown tooth electrode (16) with a side surface of external teeth (16a) formed in a crown is provided, each tooth (16a) of the crown tooth electrode (16) is fitted between the teeth (41a) of the primary die (41) with the primary die (41) elastically deformed to a small diameter, the crown tooth electrode (16) is reciprocally turned in the circumferential direction at the predetermined angle while energizing the crown tooth electrode (16, each tooth (41a) of the primary die (41) is electric-discharge machined so that profile of the tooth (41a) corresponds to the profile of the teeth (16a) of the crown tooth electrode (16), and a finishing die (42) is provided for finishing the profile of the internal teeth (42a) to form a counter-crown shape.
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