Patent GB-817499-A (GB)
Title: Apparatus for lining centrifugal casting molds
IPC: B22D13/10
Filed: 1956-11-16
Abstract: 817,499. Coating and lining moulds and cores. AMERICAN CAST IRON PIPE CO. Nov. 16, 1956 [Dec. 28, 1955], No. 35071/56. Class 83 (1). Apparatus for lining centrifugal casting- moulds comprises means for supporting a mould with its axis in a substantially horizontal position and for rotating said mould about said axis, means movable into and out of said mould while it is being rotated for delivering a quantity of lining-material to the interior of said mould, and means for adjusting the elevation of the path of movement of said deliverymeans for operation with moulds of different sizes. The apparatus comprises two identical machines L1, L2, Fig. 1, operating to form successive lining layers in moulds 32 in accordance with the process described in Specification 717,515, which is referred to. Each machine includes mould-rotating mechanism 33, a lining-trough 34 receiving a measured quantity of lining-material from a hopper 35, a car 36 which moves the trough into and out of the mould 32, and is movable on a vertically-movable frame 37, means 38 for adjusting the position of the frame, and a device 39 for preventing mixture from adhering to certain surfaces of the mould. The mould rotating means 33 comprises rollers 40 mounted on shafts 41, 42, the former driven by a variable-speed motor 45. The delivery to, and discharge from, the rollers, of moulds 32 is controlled by guide-arms 48, Figs. 5, 6, and kick-out arms 49 respectively. In the position shown in Fig. 5, arms 48 hold moulds on the rails 31 while a mould is being spun. Actuation of a piston 61, when appropriate, raises arms 49 to kick-off the spun mould, and lowers arms 48 to allow the next mould to roll forward. Retraction of piston 61 restores the arms to the first position, allowing the mould to seat on the rollers for rotation. The lining- trough 34, Figs. 7, 11, is inserted into the mould by the car 36 moving on tracks 68 and chain-driven from a reversible-motor 69 and is rotated to dump the mix, by a reversiblemotor 74. The sand-resin mix is supplied to the trough from the hopper 35 through a nozzle 77 and gate 78. The rate of flow from the nozzle is varied by adjustment of a baffle-plate 166, and the gate is operated by a pneumatic cylinder 98. The quantity of material in the trough is accurately determined by levelling it off by a striker-plate 101 of appropriate size and configuration, which is carried on arms 102 which are lowered by a pneumatic cylinder 112 until a roller 118 rides on the edges of the trough as this moves during its insertion into the mould. At the end of the forward movement of the trough the striker-plate rides up a ramp 87, carrying with it excess lining material. Pneumatic cylinders 98, 112 are then actuated to close the nozzle-gate 78 and raise the strikerplate 101. At the end of its forward stroke, when it extends through the mould, the forward end of the trough is supported by an adjustablypositioned guide 88, Fig. 17, mounted on a fixed framework 126. The frame 37 carrying the trough and car, is supported on links 135, 136, connected by a screw-shaft 145, rotation of which by a chain-drive from a reversible-motor will raise or lower the frame. The bell-end of the pipe is kept free of lining-material by compressed air delivered through pipes 123, 124, Fig. 17, which are advanced into the mould, or retracted by a piston 129. An electrical control system, including limit switches actuated by movement of the moulds and parts of the apparatus, causes the machine to perform an automatic cycle, initiated by a push-button under the control of the operator. The two systems for the two machines L1, L2, are interlocked so that the machines remain in step. Specification 817,500 also is referred to.