GB519977A - Improvements in or relating to a method of making flat metallic products - Google Patents

Abstract

519,977. Casting saws, diamond tools, and compound and other strips; rolling. MERLE, J. M. Aug. 22, 1938, No. 24664 [Classes 83 (i), 83 (ii) and 83 (iv)] A flat metal strip 35 is made by discharging a stream of molten metal and cooling it uniformly and so rapidly that it passes through the metastable state before it crystallizes. The molten metal is supplied to a partitioned ladle 6, to eliminate slag, and flows through a nozzle 5 on to an endless band 1 of steel, copper, silver, aluminium, copper alloy or other good heat conductor which may be cooled by water jets 18 and cleaned by brushes 19. The ladle is adjustable, e.g., by a screw 26, the cooling metal may be protected from air by a hood 23 supplied with hydrogen, nitrogen, ammonia or other inert gas or one producing a desired chemical action on the metal, and the solid strip 35 is received on a table 22, 21. The flow of molten metal may be regulated by a valve 27, Fig. 2, or by a driven gauging roll 28 or both. In a modification for making thicker strips up to 1/4 inch the band 1 is replaced by a hollow water-cooled ring 40, Figs. 8 and 11, having an exterior channel 41. This ring is supported by a roller 57 on a fixed support and rollers 62, 63 on a vertically guided and counter-balanced frame 64 and rotated by a toothed ring 102 secured to its side and driven through reducing gearing 99 by a motor 95. The centrifugal force may be sufficient to lift the solid and detached strip: In a modification the molten metal may be applied to the inner face of the ring 40. The roll 28 may be of refractory material or of resistant alloy. Water circulation is provided by pipes 80, 85 having fluid tight joints to stationary pipes 82, 86 axial of the ring 40 to keep this at a temperature below 500 ‹F. One or more adjustable rolls 123 may be provided to act on the strip while still plastic and carried by the band or ring. These rollers planish or compress the strip and may give it a tapered section or a corrugated or other form. The gauging and forming rolls 28, 123 may be hollow at 111 for water circulation and have teeth 122 engaging 102 on the ring. Driven brushes 133 and spring pressed carbon brushes 136, Fig. 13, may be provided for cleaning the roll 28 and ring 40. In another modification two separate metals such as a hard metal and a tough metal, may be delivered from separate reservoirs 214, 222, Fig. 14, side by side to a band 1 to form a composite strip and the roll 123 may form teeth 217 on one edge of the strip. This apparatus may also have a hood 23 which may be evacuated or supplied with any desired gas. In another modification a strip just formed has applied to it a second similar or narrower strip of a dissimilar metal or alloy or a strip of preformed metal 256, Fig. 17, or powdered ferrochrome, ferromanganese, boron, diamond, aluminium, copper, brass, &c. The strip 256 may be heated at 264 and pass through a chamber 265 supplied with any desired active or inert gas. The compound strip may be coiled at 267. The heat absorbing surfaces should be wettable by the molten metal and may be polished or plated with silver, chromium, tungsten, &c. Reference has been directed by the Comptroller to Specifications 6630/07, [Class 83], 24320/09, and 15548/13, [both in Class 83 (i)].