APPARATUS FOR SQUEEZE CASTING

摘要

Apparatus for squeeze casting of metals and alloys involving the action of increased gas pressure on the solidifying melt. In this apparatus, the pressuririzing of the gas is effected automatically during the idle stroke of the press and the high gas pressure is applied on the processed material immediately after the closing of the die. To achieve this object, the apparatus comprises a hydraulic press with pressing cylinder and a piston dividing this cylinder in two spaces, connected to the hydraulic system of the press, and a piston rod to which there are fastened the press plate and the die. At least one cavity is formed in the die, which is connected by means of corresponding valves to the supply reservoir with gas under low pressure. Within the piston rod there is formed a chamber, filled up to a fixed level with working liquid from the hydraulic system of the press. The bottom part of this chamber is connected to the space of the pressing cylinder below the piston. This space is connected to the hydraulic system of the press by means of a valve. The upper part of the chamber is connected simultaneously by means of a check valve to a supply reservoir for gas and by means of a shut-off valve - to the die cavity. The die cavity is connected by means of another shuff-off valve to the atmosphere.