Patent GB-766077-A (GB)
Title: Improvements in or relating to moulding machines for foundry moulds
IPC: B22C11/04
Filed: 1954-07-23
Abstract: 766,077. Moulding-machines; foundry plant. BUHRER, E. July 23, 1954 [Aug. 8, 1953], No. 21654/54. Class 83 (1). A moulding-machine comprises a mechanically driven turn-table 5, Figs. 2, 8 and 9, carrying two patterns 15, 17 and jolting means 9, 10 only, the remaining moulding devices being grouped round the table and moving therewith. Flasks 108, 109 are delivered along a conveyer 107 by pusher-devices 123, 124 to a grab 110. The grab is mounted on a piston-rod 54 in a revolving head 47 which carries a second piston-rod 51 to operate a sand-container 112. The moulds are compressed by a press 116 on a holder 117 fixed to a revolving-head 60 and are lifted by a grab 119 carried by a piston-rod 66 in the head 60. The pattern-table 5 and the heads 47, 60 are rotated from a motor by a common drive including a planetary gear and crank-device to give a series of intermittent movements to each of the driving-wheels 4, 40, 43, the movements beginning with a gradual acceleration and ending with a gradual deceleration. In a controlled cycle, the heads 47, 60 and the table 5 are turned through two quarterrevolutions, a fluid-operated double-acting plunger is then actuated to lock the table 5 to the base and release it from its driving gear 4, and finally the heads only are turned through a half-revolution. At the beginning of the cycle the grab 110 with an empty mould 109 is raised by the piston-rod 54 against a stop 168. A completed mould 120 is raised from the other side of the table by the piston-rod 66. After the first quarter-revolution of the heads 47, 60 and the table 5, the empty moulding- box is in the position 169 and the pre-compression unit 115 is in the position 170 where the pattern may be cleaned and pouring-cups and chills fitted. The completed mould is turned into the position 171. After the next quarter-revolution, the box 109 is lowered on to the table and the bucket 112, which is then in the position shown in Fig. 8, is raised and filled from the bunker 113 and is then lowered again. The completed mould is lowered on to the conveyer 118 and the press 116 is over the precompressed mould. This mould is then pressed by lowering the press 116 and raising the piston 9 which is jolted. The grab 119 is raised and the repeller-device 122 is actuated to push the completed mould along the conveyer. With the table now stationary, the heads 47, 60 are each rotated a half-revolution. With the filled bucket 112 over the mould, the jolt piston 10 is raised to fill the mould from the bucket 112 and the sand is pre-compressed by operation of the piston. Excess sand is returned to the bucket 112 and the piston 10 is lowered. Meanwhile, the grab 110 lifts a further mould which has been moved into position by the cylinders 123, 124. At the other side of the table, the press 116 is swung over the conveyer 118 and the grab 119 is lowered ready to lift the completed mould. In a modification, three pre-compression units may be carried on the table, in which case the heads rotate by a halfrevolution each time, or, as in Fig. 7, five such units may be carried. The wheels 4, 40, 43 are then represented by wheels 92, 93, 94 directly engaged in series with the table 85 which, in this case, is firmly connected to the gear 93. The wheels 92, 94 turn a halfrevolution when the wheel 93 turns a fifthrevolution. Two loading-grabs 137, 138, Fig. 11, are carried by a single piston 106 and two unloading-grabs 150, 152 are carried on separate pistons 100, 101. A filling-bucket is carried on a piston-rod 143 below a bunker, and a press 147 is carried on a column 148. In a further modification, six pre-compression units are provided. Two machines may be operated synchronously, one producing top, and the other bottom, mould-halves. If an even number of patterns are carried on the table, bottom and top halves may alternate. Furthermore, a machine may be operated synchronously with conveyers. All the machine cycles are controlled by automatic means including a rotary control drum which may be synchronized with a conveyer or operated by a timeswitch. Current for heating the patterns 15, 17, Fig. 2, is supplied through leads 19.