| 摘要 |
PURPOSE:To enable the formation of a gear wheel with one stage formation without an extreme increase in the load by performing a bulging formation with the descent of the one stroke of the upper die punch by pinching a billet with both punches of the upper die and lower die and by performing an upsetting formation with the descent of the upper die punch after the die reaching on a cradle. CONSTITUTION:A billet 10 is worked upto the height H2 higher than that of the finished product until a die 1 is placed on a cradle 6 by descending the die 1 with its bulging part and by sliding it along the lower die punch 5 with the billet 10 being bulging-formed from the prescribed insterval H1 when the billet 10 is inserted into the cavity formed with a tooth profile forming part 2 and the lower die punch 5 and the upper die punch 8 is descended. The finished product having the height H3 is obtd. by filling up the metal on the whole tooth profile 3 of the forming part 2 by performing the upsetting formation with the descent further of the upper die punch 8 after the die 1 being placed on the cradle 6.
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