| 摘要 |
PROBLEM TO BE SOLVED: To control the diameter of an injection hole without changing a punch or a die. SOLUTION: A strain rateεp of a work 110 can be adjusted by adjusting the wrinkle pressing pressure of a pressing plate 103, the drawing bead pressure of a drawing bead 106, and the cushion pressure of a cushion plate 107 to freely control the diameter of the injection hole of a drawn bottom part 110b. Therefore the diameter is controlled without changing a punch or a die in this way and hence the punch or the die need not be prepared whenever the diameter of the injection hole is changed, which can reduce equipment cost.
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