Patent GB-714325-A (GB)
Title: An improved method and means of casting molten metal
IPC: B22D7/08
Filed: 1950-03-10
Abstract: 714,325. Moulds casting processes. HETHEY, A. March 5, 1951 [March 10, 1950; Oct. 25, 1950], Nos. 6037/50 and 26017/50. Class 83 (1). In casting ingots the metal is poured into a multi-part longitudinally split mould and as soon as the ingot is self-supporting the mould parts are separated slightly from the ingot surface for cooling. Into this space nitrogen, hydrogen or hot gases &c. may be injected. The mould may comprise a central part 29, Figs. 1 and 2, with recesses 32 on both faces and two outer parts 30 each with recesses on one face to mate with the recesses in the part 29. Each part 30 is held by a bracket 33, 34 pivoted on an eccentric part of a spindle 35 mounted on a base 28 so that, after pouring, the part 30 can be moved away from 29 by rotating the spindle 35 by its arm 36, a link 37 and a handle 39 pivoted to the part 30. Each handle 39 may be arranged with a part which will pass through a slot in the mould wall, when the handle is turned, to press the ingots slightly away from the mould face. When the ingots have cooled sufficiently, tongs, not shown, are used to engage each handle 39 and turn the corresponding part 30 into recumbent position as at the right-hand side of Figs. 1 and 2, sand 41 cushioning the blow which may, however, be used to effect a separation of the ingots from the mould part so that they can easily be removed. After cleaning and coating, the mould is closed for the next cast. This construction of mould is more fully described in the second Provisional Specification. In a modification the mould comprises halves 42, 42a, Figs. 3 and 4, standing on a base 43 having a hole 45 in which is fitted a vent-pipe 44, plug 46 and anti-splash cap 70. Lugs 47, 48 on each half 42 are engaged by corresponding lugs 49, 50 pivoted on quadrants 51, 52 adapted to roll on the base 43. Brackets 53, 55 on the inner face of each pair of quadrants pivot on a vertical pillar 57 on which is fitted a sleeve 58 connected by links 60 to a hand lever 63 pivoted at 64 to the base. Linkages 65, 67, 66 connect the two levers 63 to ensure that they move in or out together. In the position shown, the mould is closed for pouring,.then the outer ends of each pair of quadrants are pressed together to rotate them about the pivots 57 and thus withdraw the mould halves slightly from the ingot. The plug may have radial passages 71 communicating with a central bore to admit injected gas. When the ingots have cooled sufficiently, either of the levers 63 is pulled outwardly thus rolling all the quadrants with mould halves 42, 42a away from the ingots which are removed by a crane. Instead of the duplex mould 42, a single mould, Fig.. 6, divided into quarters 77 may be used, each quarter having an upper and a lower lug 93 and these being engaged by the lugs 49, 50 after the quadrants 51, 52 have been turned about the pillars 57 to bring the lugs 49; 50 nearer together. In another modification two halfmoulds 86, 87, Fig. 8, may engage a stationary mould part 88 adapted to complete four ingot cavities, the lugs 99, 100 being engaged by the pivoted lugs 49, 50 as in Figs. 3 and 4. In order to cast ingots of differing height one of the mould parts 101, Fig. 11, may have vertical slots 102, 103, tapering from inside to the outside as shown, a stop-piece 104, Fig. 14, of the desired depth D being inserted in the slot before pouring. The stop may have an overflow groove 106 and pivoted trough, if desired. To avoid splashing the metal may be poured from a ladle 20, Fig. 1, through a vessel 24 having as many nozzles 25 as there are mould cavities between mould parts. The moulds may be formed to produce ingots of any desired crosssection and may be mounted on a stand vibrated during pouring and cooling.