| 摘要 |
PURPOSE:To prolong a die life and to make mass production easy by dividing a working process into a 1st stage for piercing pilot holes, a 2nd stage for punching symmetrical tooth form forming parts, a 3rd stage for punching rough tooth parts and a 4th stage for trimming the machining allowance of the rough tooth parts and punching the outer shapes of toothed parts. CONSTITUTION:The working process for working a pair of symmetrical toothed parts are divided into the 1st stage for piercing pilot holes, the 2nd stage for punching symmetrical tooth form forming parts 104a, 104b, the 3rd stage for punching rough tooth parts 107a, 107b and the 4th stage for trimming machining the allowance of the rough tooth parts, forming the final tooth form shapes 105a, 105b and punching the outer shapes of the toothed parts and pressing is performed to materials sent progressively to each working position in synchronization with each pressing timing. In this way, a pair of symmetric toothed parts can be manufactured without machining. |
