| 摘要 |
A coil maerial of special steel is cut and a ring coil for starter is formed, and both ends of the ring coil material for starter are connected thereby a ring-shaped material is formed. Two different machining works, a tooth part punching work and a chamfer part forming work, can be performed at one step. That is, the two different machining works can be performed by one press, and since the applied pressure is distributed in each step, the manufacturing in a small press becomes possible.
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