Patent GB-953435-A (GB)
Title: Improvements in or relating to methods and apparatus for making hollow ingots, laminate stock, hollow tubular bodies and to ingots and hollow tubular bodies
IPC: B21C37/14
Filed: 1960-10-20
Abstract: 953,435. Continuous casting machines; casting composite ingots; making tubes; breaking; rolling; stop weld material. CONTINENTAL CAN CO. Inc. Oct. 20, 1960 [June 20, 1960], No. 35981/60. Headings B3A, B3E, B3F and B3M. A hollow ingot is continuously cast by supporting a permanent core in an open-ended mould, holding spacer bars against edges of the core and projecting upwardly out of the mould, pouring metal into the mould whereby it bonds to the spacer bars and solidifies within the mould and around the core, and offecting downward movement of the casting with the integrated spacer pieces concurrently with continued pouring. A composite ingot, Fig. 11, with a number of longitudinal internal channels 81 and cast-in spacer pieces 80 therebetween is made by continuously casting in a water-cooled mould 20, Fig. 1, with a number of watercooled graphite cores 40 supported by a water-cooled support 32 through which the spacer pieces 41 pass. The spacers are secured to the withdrawal table 24 and held under tension during feeding by the rollers 34. The melt is poured from a tundish 36 with drop-tubes. The support 32 may be vibrated to minimize sticking to the cores and promote adhesion of the melt to the spacers, which are also heated by burners 38 and may have a flux applied to them. The cores 40 have chisel-shaped or rounded edges with which engage corresponding grooves in the spacers. The spacers may each be made of two pieces with weld-resisting material such as a coating of soot, aluminium oxide or a silicone between, so as to leave discontinuous portions 112, Fig. 21, after rolling. Edge pieces 115m of a more ductile metal, e.g. aluminium, may also be incorporated in the ingot of e.g. aluminium alloy, to prevent edge-cracking during rolling. After casting the ingot is scalped and milled, Figs. 15, 16, to such a shape, Fig. 18, and with the grooves 92 so disposed that subsequent rolling results in equal lateral spreading of the longitudinal cavities 81. Before such rolling the cavities are filled, and one side at least of each groove 92 is coated, with a weld-resisting material so that the rolled sheet may be divided by bending, Fig. 28, along the groove residues 111, Fig. 21, and the laminations 129, 130 spaced apart, as by a mandrel 126, Fig. 30. The fins 128, Fig. 32, are formed in the more ductile metal of the spacer pieces and may be flattened as by a hammer 132, to the form shown in Fig. 33. The weld-preventing material may be a powder such as alumina or other refractory, metal halide, an organic substance such as polysiloxane, a polyvalent metal stearate such as ferric or aluminium soap, an epoxy resin, or a hydrocarbon polymer such as polyethylene. When hard particles are used, some become embedded in the internal surfaces of the laminations and provide keys for a coating of an organic enamel composition. The ingot may be hot-rolled from 8-12 inches to 4-6 inches, reheated to 900 F., hot rolled to 0.090-0.15 inch, cooled, coiled, heat treated and cold rolled to final gauge of 0.010-0.020 inch with intermediate annealing, e.g. 5052 Al alloy 1-4 hours at 350-500 F., 6061 Al. alloy 1 hour at 980 F. Specification 953,436 is referred to.