| 摘要 |
952,064. Making ingots for cans; rolling. CONTINENTAL CAN CO. Inc. May 17, 1960 [Aug. 7, 1959], No. 17379/60. Headings B3A and B3M. A billet from which laminate, expandable strip-stock 60, Fig. 6, is produced for making cans is so formed as to predetermine the widths of the residues of the plurality of cores of stopweld remaining after the billet-thickness has been reduced. An iron or aluminium alloy billet may be cast and the stopweld channels 11-13 filled with stopweld during or after casting. The metal may be cast about encased stopweld, or channels for the stopweld may be machined in the casting. Alternatively, a pair of slabs, either or both of which have a stopweld channel, are joined by brazing or rollbonding to form the billet, which is filled with stopweld before or after joining. To compensate for differential lateral spreading during rolling the billet down to strip and thus predetermine the widths of the stopweld residues, longitudinal slots 14-16, Fig. 1, are formed which have successively greater cross-sections from the centre of the billet towards its edges E, as by increasing the depth or root-angle of the slots. Instead of, or in addition to, the slots, the crosssection of the billet may be tapered or curved at the edges 43, Fig. 3. The stopweld residues may each have the same width if the stopweld corewidths in a parallel billet vary from a maximum at the central areas 53, Fig. 4, to a minimum at the edge areas 51. Variable stopweld width may be combined with peripheral slots and a shaped profile (Fig. 3, not shown). |
