| 摘要 |
PURPOSE:To discharge a formed part with its dead load by eliminating the sticking of the lower side mandrel and formed part by making a mandrel punch a floating type and by dividing the mandrel into the upper and lower disusing the mandrel which is from the upper part. CONSTITUTION:A mandrel punch 17 is located inside dies 11, 12 with the state of sticking to the blank 24 of semi-finished formed part A mandrel 16 is ascended during the descent of a ring punch 20 by inserting a blank 25 into this die 11 and said punch 17 is supported by the mandrel 16. The blank 24 is then descended via the blank 25 by the descent of said punch 20 and an internal tooth gear is formed inside the blank 24. The mandrel 16 is then descended together with said punch 20 to take off the formed part form the constraint of the mandrel 16 and to discharge to the external part from discharging port 5.
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