| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a superposed plate material for hydroforming with high productivity. SOLUTION: A superposed plate 1 suitable for manufacturing a hollow product having a closed section structure having a X-shaped or cross-shaped reinforcing material therein is manufactured through the following three steps (a) to (c). (a) Two reinforcing plates 7, 8 are superposed on top of each other, and a position corresponding to the X-shaped or cross-shaped intersection is welded at a weld part 9 to manufacture a preformed reinforcing material 4. (b) Plates 5, 6 are superposed respectively on the upper part and lower part of the preformed reinforcing material 4, an electrically conductive welding preventive plate 13 is inserted between the reinforcing plates 7, 8. The upper reinforcing plate 7 is superposed on the plate 5, and the lower reinforcing plate 8 is superposed on the plating 6, followed by simultaneously resistance welding at weld parts 10, 11. (c) The peripheral parts of the plates 5, 6 are continuously welded to each other at a weld part 12 to complete a superposed plate 1 having a bag structure. COPYRIGHT: (C)2006,JPO&NCIPI
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