Patent GB-678479-A (GB)
Title: Improvements in machines for the diecasting of metals
IPC: B22D17/10
Filed: 1950-06-27
Abstract: 678,479. Casting-machines; clamping moulds. STERNBERG, J. DE. June 27, 1950 [June 28, 1949], No. 16064/50. Class 83 (i). A pressure casting-machine has one mould half supported on a stop while the second half is moved towards it to close the mould, the second half having thrust pillars behind which there may be introduced mercury expansion locking devices moved transversely to said pillars. The mould half 16, Figs. 4, 6, is mounted on a slide 10 moved along guides 1, 2 by a hydraulic plunger 9 and when the mould has been closed and pressed against the fixed head 4, as shown, slide blocks 19, Fig. 5, each having a cylindrical bore 27 containing a plunger 29, are moved from the outer positions, Fig. 7, into recesses 18 in the fixed head 3 by hydraulic cylinders 21 so that the plungers 29 come in behind the ends of pillars 17 extending from the back of the slide 10. Mercury is then pumped into the cylinders 27, inlet valves are closed and electric resistances 44 are used to heat the mercury and thus clamp the mould parts. Meanwhile molten metal has been poured into a ladle 67, Fig. 10, arranged on one side of the head 4 and the ladle is turned about the axis of a sleeve 66 which extends horizontally into the head in line with one of four cylinders produced when semi-cylindrical grooves 56, Fig. 8 formed in the contacting faces of the head 4 and the slide 14 on which mould half 15 is mounted, are brought together. As the ladle rises a fixed plate 114, Fig. 10, which exactly fits it, forces the molten metal through the sleeve 66 into said four cylinders. When a piston 112 is engaged by a hydraulic plunger 120 the ladle stops and the molten metal between its base 109 and the plate 114 is forced out through the sleeve 66 by the parts 120, 112. Then four pistons 55 are moved in radially by hydraulic plungers 63 to force the molten metal from the sleeve 66 and four cylinders 56 through a nozzle 60, Fig. 6, into the mould cavity. A sleeve 71 and mandrel 72 are then moved by hydraulic means 77 into the nozzle to cut it off from the cylinders 56 and finally the mandrel is advanced alone to apply heavy pressure to the metal in the mould. The blocks 19 are then withdrawn, the slide 10 is moved back to open the mould and, by means of rods 50 having heads 51, Fig. 4, to move the slide 14, separate the half cylinders 56 and sever the runner r. The casting c is ejected by rods 93, 94. The ladle, pistons 55, 112, sleeve 71 and mandrel 72 are then returned to their original positions thus causing the solidified gate G to fall and exposing the half cylinders 56 for cleaning and coating. If the ladle needs cleaning or its refractory lining 108 repairing it can be moved on rods 134, 135, Fig. 8, away from the head 4 and plate 114 by hydraulic cylinders 138, the weight of the ladle being taken by an anti-friction pad 146, Fig. 10, engaging the rod 135. The slides 10, 14 and head 4 are so shaped and provided with packing 97, 98, Fig. 4, that the mould and metalforcing cylinders are completely enclosed and the atmosphere in them can be controlled. The mercury in the cylinder 27 is returned to a sump where it is cooled. The hydraulic actuating means may be replaced by mechanical, electrical or other means. The machine may be used for making large die-castings of steel.