| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a piping member more inexpensively and faster. SOLUTION: The method of manufacturing the cylindrical piping member whose one end is a welding part to be welded to another member is provided with a stage group (S1-S6) and a stage group (S8-S10). In the stage group (S1-S6), a plate-shaped blank is formed into a shape including a first part (51f) having a cylindrical thick wall-thickness and a thin second part (52f) where is adjacent to and crossed with the first part (51f) and the welding part by press forming. In the second stage group (S8-S10), the second part (52f, 52g) is formed into a cylindrical shape by press forming and a step (56h) is generated on the boundary between the first part (51h) and the second part (52h). COPYRIGHT: (C)2009,JPO&INPIT
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