| 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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