| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for torsion beam, which reduces a molding force. SOLUTION: The manufacturing method for torsion beam 2 has a first process and a second process. The first process makes a punch 8 press a part of a peripheral wall of a tubular member 7, thus forming a depression 5. The second process expands and opens any other portion different from the part of the peripheral wall while liquid pressure is keeping a shape of the depression from the inside of the tubular member, and molds the tubular member into a product shape or an intermediate molded part 26 having the product shape. COPYRIGHT: (C)2009,JPO&INPIT
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