| 摘要 |
The invention relates to a method for manufacturing a hollow, elongated structural element, where a first and a second blank (1, 14) are led through an oven (2) for heating to working temperature and are led through rollers (3, 4) with profiled surfaces for pre-forming in one or more steps. The blanks are each led through a forging press with a number of cooperating dies, the blank being worked in a number of steps (5, 8, 11) into halves of an essentially finished product, having a cross-section substantially in the shape of a U-profile with a predetermined varying height, width and thickness of material along its length. The second blank (14) is essentially a copy of the first blank (1). In a final step (15) the blanks are joined together into a composite hollow structural element (18). The invention also relates to a structural element manufactured according to the method.
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