GB336857A - Method and apparatus for freeing and extracting castings from sand molds - Google Patents

Abstract

336,857. Camerota, L. A. Dec. 5, 1929. Cleaning, externally; cleaning internally, rotary appliances for. - A casting is removed from a sand mould and cleaned externally by applying relative rotary and longitudinal movement between flask and casting. The machine shown in Figs. 1 and 3 is for removing pipes from centrifugal moulds 2 two at a time. The moulds are advanced on rails 35 to a frame 1, while this is in horizontal position, and are supported by a notched plate 29. The frame is then tilted, into the position shown, by a device 7, aligning rollers 32 being pushed up by a fixed abutment 34. Jaws 11 of chucks 5, which can be rotated in either direction by motors 9, are then closed on the flasks by an hydraulic cylinder 10. Mandrels 12 are then advanced on a truck 6 by an hydraulic cylinder 22 and rope gearing 21, 17 to enter the end of the casting. A jaw 13 of the mandrel is then forced out by an hydraulic cylinder 25 to grip the casting and the flask is rotated, if desired first in one and then in the other direction. While the flask is still rotating the truck 6 is withdrawn and as it approaches its right-hand position a cam 38, Fig. 3, thereon operates linkwork 39. 43, to swing supporting arms 37 below the castings 3. The frame is then brought into horizontal position, the mandrels withdrawn, and the castings removed over rails 46. The mandrels 12 may be used for clearing dross &c. from the inside of the pipe ends by expanding the jaws 13 by a pressure insufficient to hold the pipes when the flasks are rotated.