GB1036506A - Pressure casting apparatus - Google Patents

Abstract

1,036,506. Pressure casting apparatus. AMSTED INDUSTRIES Inc. April 22, 1965 [May 11, 1964], No. 16985/65. Heading B3F. Pressure casting apparatus comprises a movable mould unit 12 (Fig. 1, not shown), and molten metal holding and pressurizing means 10 which includes a ladle 20 housed in a pressure chamber 14. A pouring tube 22, which may be raised and lowered, extends through the top of the pressure chamber into the ladle 20. The outer end 24 of the tube 22 is adapted to communicate with the mould 24 at the bottom plate 42. In operation, the mould unit is located over the chamber 14 and the tube 22 is raised to connect with the mould. Compressed gas admitted to the chamber then forces metal from the ladle into the mould. Means in the form of bellows 72 (Fig. 2, not shown) are provided to prevent escape of compressed gas through the seal between the chamber top and the pouring tube. The bellows are located concentrically around the pouring tube axis. The raising and lowering of the tube can be effected by hydraulic means or in an alternative arrangement by compressed air. In the latter case two concentrically located bellows are provided around the pouring tube and the space between the outer and inner bellows is pressurized to effect raising of the tube which falls under gravity when the pressure is removed after casting.