| 摘要 |
Process for manufacturing of an elongated metal beam (3) used as a vehicle body component, wherein the metal beam (3) in its lengthwise direction finally has at least one segment (4) with a full cross section, followed by a tapering segment (5) with tapering of the cross section in one direction - the tapering direction - from the full cross section to a reduced cross section, followed by a segment (6) with reduced cross section. The process comprises the following manufacturing steps: Providing a planar strip of metal sheet material with a predetermined width and continuously feeding the planar strip to a roll forming station. In the roll forming station roll forming the planar strip into a shaped strip (7) with a closed cross section or an essentially U-shaped cross section. Thereafter forming the tapering segment (5) of the shaped strip (7) by progressively displacing at least one wall - the thrust wall (8) - of the shaped strip (7) in the tapering direction towards an opposite wall (9) or an opposite open side of the shaped strip (7). During roll forming of the planar strip to the shaped strip (7) at least one lengthwise extending bead (10) is roll formed into the one wall or the two opposite walls of the shaped strip (7) that extends or extend in the tapering direction - the bending wall or walls (11) -. Each bead (10) provides a predetermined bending area of the corresponding bending wall (11). Forming of the tapering segment (5) of the shaped strip (7) is done by progressively compressing the bead or beads (10) from a large cross section in the segment of the shaped strip (7) with the full cross section to a small cross section in the segment of the shaped strip (7) with reduced cross section whilst leaving the other areas of the bending wall or walls (11) essentially unaltered.
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