| 摘要 |
PROBLEM TO BE SOLVED: To form a complicated shape section under a gas pressure of <=1 MPa when a gas pressure of >=1 MPa is required at the last stage of forming in forming a complicated shape section of a die face. SOLUTION: When reaching close to the last stage of forming, i.e., close to the timing to form a complicated shape section, the application of a gas pressure to a plate is temporarily interrupted. The compressed gas belt near the plate is discharged. A compressed gas is injected to the plate material toward a complicated shape section side.
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