Patent GB-437064-A (GB)
Title: Process for the manufacture and treatment of endless castings in a continuous operation
IPC: B22D11/18
Filed: 1934-09-12
Abstract: 437,064. Casting and rolling rods. MESSINGWERK SCHWARZWALD AKT.- GES., Villingen, Baden, Germany. Sept. 12, 1934, No. 26250. Convention date, Oct. 19, 1933. [Classes 83 (i), 83 (ii), and 83 (iv)] Castings ; moulds; mould materials ; electricity, heating by ; metal-pouring.-In the continuous casting of rods, using a cooled moving mould 1, and wherein the solidified rod is pulled away from the mould as by rolls 8, the delivery area of the nozzle and the speed and temperature at which the metal is cast are constant, the casting is effected in a protective atmosphere, and the cooling is such that the metal in the mould solidifies to a point close under the metal surface. Metal is delivered from a ladle 9 into a heating chamber 10 where its temperature is maintained, and passes, under pressure from a chamber 21, through a tube 14 into a container 12, from which it passes through a nozzle 11 into the mould 1. In a modification, the metal is delivered through a horse-shoe pipe 13, Fig. 2, of which the limbs constitute the inlet 14 and the nozzle 11. A protective gas, or liquid layer which may also serve as a lubricant such as oil or molten salt, is delivered above the metal in the mould from a perforated tube 19. The metal conduits are heated to maintain a constant temperature, preferably wholly or in part by the passage of an electric current. The mould 1 is reciprocated during casting, its downward velocity being the same as that with which the rod is pulled by the rolls 8, its return velocity preferably being greater. Constant rate of delivery of the metal into the mould is obtained by a float in the container 12 or in the mould itself, or when electric heating is employed by an ammeter indicating variations in resistance, these indicators operating an audible or visible signal so that the pressure from the chamber 21 may be manually controlled, or the indicators effecting such regulation automatically. The level in the mould is maintained so that the nozzle 11 is close to, or under, the metal surface. The resistance variations may also operate a heating control. Metal is introduced into the heating-chamber 10, Fig. 4, while casting continues, from a ladle 25 through valves 26, 23, a bell 28 surrounding the ladle being raised to the same pressure as the chamber 10. In the modification of Fig. 1, the level in the container 12 is temporarily raised, a valve 22 is closed, and metal is run into the chamber 10. The rolls 8 may effect a reducing operation on the work. The cast rod may be reduced in a rolling-mill such as that described in Specification 289,812, [Class 83 (i)], or may be reduced by hammering, the reduction being from 20 per cent to 95 per cent of its cross-section. A saw may move with the work to sever it into lengths. The mould and conduits are formed of a high chromium iron alloy which may be lined inside and outside with ceramic material such as steatite or silomanite. The material should be non-alloying with the metal cast, and if electric heating is employed, of greater resistance than the molten metal.