| 摘要 |
A method of rollforming one-piece tubular doorbeams (10). The method includes the steps of drawing a continuous metal strip (20), creating cut-outs (22) in the edges of the strip at spaced locations, rollforming the strip into a tube (30) so that the unindented edges (24) engage one another, welding the engaged edges together, cutting the tube in the areas of the cut-outs (22, 32) to create pre-forms (40), and opening the ends of the pre-forms to create end brackets (16). Additional optional steps provide customization of the end brackets. |
