| 摘要 |
PROBLEM TO BE SOLVED: To provide a core for hydroforming which can perform a good molding while preventing a buckling of a metallic pipe. SOLUTION: This core is a hydroforming core wherein plural ball shape or disc shape deform prevention elements 11 are flexibly connected with connecting members 12 and, is used by setting it inside a metal pipe P before starting hydroforming for preventing the metal pipe P from being deformed inwards. It is preferable that the core is connected to a shaft pushing metal fitting 41 for easy pull out after processing.
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