GB1296850A - - Google Patents

Abstract

1296850 Moulding-machines; flasks; foundry plant BANGOR PUNTA OPERATIONS Inc 16 Dec 1969 [16 Dec 1968] 61253/69- Heading B3F A moulding box 19, Figs. 5, 6 is permanently secured on a frame 18 which is slidably movable on a block 20, bearing trunions 21 so as to be swingable in a fixed frame 10 to a mould-ejecting position, Fig. 6, in which a bottom pattern plate 14 is moved in the box 19 by stripping rods 22 slidable in the block 20 for ejection of a sand mould 25, the plate 14 being also movable, for sand-compression, by a centre column 29, similarly slidable by a squeeze cylinder-andpiston 16, 17 (mounted on the machine base 12) when the sand-filled box 19 is raised (by pistons 28) into engagement with an upper pattern plate 13, the box 19 and frame 18 being subsequently lowered (by cylinders 43) so that they can be swung, as in Fig. 6, for a cylinder 38 to operate the stripping rods 22 to push the flaskless sand mould 25 on to a conveyor 47 to engage a previously-made mould 25<SP>1</SP> to form casting cavities. The moulds may be filled on the conveyer or elsewhere. The centre column 29 is fixed to the bottom pattern plate 14 and can slide through the box bottom 44, the trunnion block 20 and a brake 15 which, however, by the inflation of cells 42 can grip the column to lock it or reduce its rate of descent under gravity along with the plate 14 and rods 22. For filling the moulding box 19, sand 25 is dropped through a hopper 37, Fig. 2, past driven aerating blades 25 on to the patterns 45 and then a head 11 is moved by a cylinder 39 so that the upper pattern plate 13 replaces a pouring frame 33, above the box 19. The compression of the sand may be augmented by the lateral insertion of blocks (48,51) into the filled box 19 by cylinders (48, 52).