| 摘要 |
PURPOSE: A punch for hydroforming is provided to prevent a hydroforming tube from bursting by completely removing oil or iron powder from the hydroforming tube. CONSTITUTION: A punch(100) for hydroforming comprises a body part(200) and a punch part(300). The body part is connected to an actuator. A first flow path(210) penetrates through the inside the body part. One side of the punch part is connected to the body part, and the other side is inserted into a hydroforming tube. A second flow path(310) of the punch part is connected to the first flow path. Liquid is spirally injected to the hydroforming tube through the second flow path.
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