Patent ID: 6881494
Filing Date: 2005-04-19
Classification: B21D,Y10T

Abstract:
1. A section comprising section walls which delimit a hollow space, two of the section walls being arranged to define each corner region of a cross-section of the section, at least one of the section walls at the corner region having a region that is curved in cross-section, the curved region having a curvature which is part of a circle, the curvature having an arc length that is determined by a distance between flanges delimiting adjacent corner regions, the distance between the flanges being equal to a length of the section wall less lengths of the adjacent corner regions and a projected length of an outer surface of the flange of the section from a corresponding outer wall face of an intended final section configuration, the length of the flanges at the corner region of the section being three to four times an average wall thickness in the regions of the section walls adjacent to the corner region.