| 摘要 |
Method and arrangement for manufacturing a hollow elongate construction element in which a first blank and a second blank ( 1, 14 ) are conveyed through a furnace ( 2 ) for heating to working temperature and are conveyed between rolls ( 3, 4 ) with profiled surfaces for preshaping in one or more steps. The blanks are each conveyed through a forging press with a number of interacting die cushions, the blank being worked in a number of steps ( 5, 8, 11 ) to form halves of an in the main finished product, having a cross section essentially in the form of a U-profile with a predetermined varying height, width and material thickness along its length. The second blank ( 14 ) constitutes in the main a copy of the first blank ( 1 ). In a final step ( 15 ), the blanks are joined together to form a composite hollow construction element ( 18 ). |
