Patent GB-697111-A (GB)
Title: Improvements relating to the manufacture of foundry molds
IPC: B22C15/08
Filed: 1950-12-13
Abstract: 697,111. Moulding- machines. BERGAMI, E., and CEVOLINI, S., -[trading as BERCEV SOC IN NOME COLLETTIVO]. Dec. 13, 1950 [Dec. 13, 1949], No. 30476/50. Class 83 (i). An automatic moulding- machine has its parts actuated by hydraulically-operated pistons under the control of a number of cams, said parts including a support for a flask, one half of which is secured to a rotatable member carried by a vertically slidable carrier, means for locking the other half of the flask to the first half, a verticallyslidable support for a pattern plate, and a sand-hopper with closure means. The base 1 of the machine comprises an oil sump from which a pump 23 forces oil into a tank 22 from which it passes by way of a group of valves 25 to the cylinders controlling the parts of the machine. The valves are actuated in sequence by cam-drums driven from a motor 41, one complete revolution of the drums effecting one cycle of the machine. In Fig. 1, the flask halves 81, 82 with a pattern plate 83 therebetween are shown resting on a carriage 72 supported on rollers 71 in the top of a piston 3 which is in its lower position so that the rollers 71 are level with rollers 75, 77, on brackets 76, 78 arranged at each side of the piston. Above the flask is an open-ended container across which can be moved sliding gates 54 rigid with racks 57 movable by pinions 55, 56 which are in turn operated from other racks moved by a piston in a cylinder 16 (not shown). By means of a cylinder 7 the container 52 and its gates 54 can be moved horizontally to a position beneath a sand-hopper 42. On the return of the container, the bottom of the hopper is closed by a plate 53 projecting from the top of the container. Above the container is a pressing-plate 48 supported by a hollow piston 46 which operates within a larger piston 18 and which may be moved down against a spring 47 by fluid supplied at 181. A heavier pressure may then be applied by supplying fluid at 171 to force down the piston 18 within its cylinder 17 against springs 45. The flask half 82 has at each end projecting parts 87 by which it is secured to axles 12, one of which has a pinion 97 engaging a piston-operated rack 98. The axle housings 89 are carried by vertically movable rods 99 operated by pistons 100 so that the flask may be raised from the carriage 72 and then inverted by the rack and pinion mechanism 97, 98. Members 95 attached to the other flask-half 81 may be locked to the axles 12 by bolts 91 which may be pushed forward against springs 96 by pistons 90 so that the ends 92 of the bolts enter holes 93 of the part 95. Members 106 carried by rods 104, 105 operable by cylinders 15 have projecting rollers 107 engaged beneath to lift the pattern plates 83. Operation. The container 52 is charged with sand from the hopper 42, returned to its position over the flask, which is arranged with the part 81 uppermost, and the piston 3 is operated to press the flask against the container, whereupon the gates 54 are opened to discharge the sand into the flask 81 above the pattern plate 83. The pressure plate 48 is moved down through the container to pack the sand in the flask and is then withdrawn. The flask is lifted by axles 12, inverted and lowered so that the filled part 81 rests on the carriage 72. Pistons 90 are operated to unlock the port 81 and fluid is admitted to cylinders 15 to raise the members 106 to lift the pattern plate off the part 81, this operation being facilitated by vibrators 108 carried by the members 106. The carriage 72 with flask part 81 is now pushed off the table 4 on to the rollers 77 by a member 74, operated by a cylinder 10, and of the same height as the carriage 72 and flask part 81. The pattern plate is next lowered on to the member 74 and the earlier operations repeated to fill the flask part 82. Meanwhile an operator can place cores in this part of the mould. The second mould part within the flask 82 is formed with a pouring aperture by moving a hollow punch 69 into position above the flask and raising the flask so that the punch penetrates the sand. After returning the punch, a member 86 carrying at its end a plug 85 is moved to the left as seen in Fig. 1 and the pattern plate 83 and flask part 82 raised by the rollers 107 and axles 12 so that the plug enters a hole 84 in the plate. The part 82 is raised still further and the vibrators 108 operated to facilitate drawing, after which the detached plate 83 is dragged away on to rollers 109. Carriage 72 and flask part 81 are meanwhile returned to the table 4 and the part 82 lowered on to the part 81 which is again locked by the bolts 91 which now enter holes 94. The plate is lowered to hold down the mould while the axles 12 are raised to strip off the flask, the completed mould then being pushed off the carriage 72 by a member 80. The machine then operates to unlock the part 81, separate the parts, reinsert the pattern-plate therebetween, relock the part 81, raise and invert the flask and lower it on to the carriage 72 ready for a further cycle of operations.