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