| 摘要 |
PURPOSE:To facilitate the knockout of a formed part out of a die body without the need for releasing material by forming a draft by shrinking one part of a formed part by cooling it with the air blowing out of a knockout pin after completion of a superplastic forming. CONSTITUTION:The plate stock 17 composed of a superplastic material is fitted to a die body 10 and press-fitted to the die 10' of the die body 10 by the superplastic deformation of the plate stock 17 by acting a gas pressure P on one side face of the plate stock 17. After completion of the superplastic forming a knockout pin 12 is descended to form an air pool 18. The bottom A' of a formed part A is shrinked by cooling it by blowing out slowly the air from the nozzle 14 of the knockout pin 12 to form a gap B between the side wall A'' of the forming article A and die 10'. The knockout of the formed part is thus facilitated by becoming of the same as having a draft. The formed part A is raised with the lifting of the knockout pin 12 with blowing out the air from the nozzle 14 of the knockout pin 12 and carried outside the furnace.
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