| 摘要 |
989,027. Making beams and tubes; die-rolling; welding by pressure. VEREINIGTE OSTERREICHISCHE EISENUND STAHLWERKE A.G. July 24, 1962 [July 28, 1961], No. 28466/62. Headings B3A, B3M and B3R. A process for making sections, e.g. U, trough or angle sections, and tubes from metal strip and of constructions assembled therefrom comprises strain hardening the strip by cold rolling over at least part of its longitudinal and lateral extensions prior to shaping it into the section. Steel strip 32 from a reel 33 travels over a feed roller set 34, past a strip cutter 35 to an end welding machine 36, through an adjustable roll stand 37 to a shape rolling machine 38. The roll stand 37 may comprise a four-high unit of back-up rolls 39, 40 and adjustable ridged rolls 41, 42 which produce corrugations in the strip without any reduction in its width to increase its yield point and tensile strength and decrease its elongation. The strip may be completely or partially, corrugated in transverse, longitudinal or oblique directions or in a combination of said directions. Sections having substantially right-angled corners are formed such that convex and concave curves 10, 9, formed on the sheet form the outer and inner corners respectively of the sections, Figs. 10 and 8 (not shown). A box section, Fig. 9 (not shown), is produced by longitudinally welding two U-shaped members along the untreated zones 11. U -shaped sections are formed from strips 23, 24 having different material thicknesses but identical overall thicknesses by a punch roll 21 and die roll 22. The ends of strips having a common overall thickness may be welded together to facilitate a continuous rollforming process. Sections may be joined at their crests by resistance welding using flat electrodes or if the corrugations of the sections run parallel by interposing a member 29 having transverse corrugations or wire elements between them and applying electrodes 30, 31. Suitable corrugated strips are formed into door frames, Fig. 10; flat tubes for the heat-exchange purposes, Fig. 21, corrugated tubing, structural panels, Fig. 27, and a lattice type guider, Fig. 29, comprising a pair of corrugated open box sections welded to a corrugated zig-zag central member. |
