| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydroform working method by which, even when axial pushing power is large, a metallic pipe is not buckled and a product having high aspect ratio in the cross sectional shape of an expanded pipe part and large expanding ratio of the pipe can be obtained and a metallic mold for hydroform working. SOLUTION: The metallic mold for hydroform working is used for applying inner pressure and a pushing force in the pipe axial direction to the metallic pipe to form the pipe into a desired shape. This metallic mold is composed of: a movable metallic mold divided into two parts so as to be freely moved in the pipe axial direction; and a fixed metallic mold divided into two parts and holding the movable metallic mold. The tip part of the movable metallic mold is cut off in a V-shape in a axial pushing direction. COPYRIGHT: (C)2004,JPO&NCIPI
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