Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1981-04-02
1983-07-19
Godici, Nicholas P.
Metal founding
Process
Shaping liquid metal against a forming surface
164121, 164113, 164284, 164306, B22D 1706, B22D 1800
Patent
active
043939163
ABSTRACT:
The invention relates to an apparatus for pressure die casting of metals and alloys involving the action of increased gas pressure on the solidifying melt. In this apparatus, the gas is pressurized automatically during the stroke of the press and pressurized gas at elevated pressure is applied to molten metal in the die cavity immediately after the closing of the die. For this purpose, the apparatus comprises a hydraulic press including a cylinder and a piston slidably mounted therein, which piston divides the cylinder into a first and second chamber. The first chamber is in communication with a source of pressurized liquid and the second chamber is in communication with a gas retaining cavity disposed in the piston rod of the piston. A press plate and die having at least one die cavity is rigidly mounted on the piston rod. The cavity of the die is connected by means of corresponding valves to a supply reservoir with gas under low pressure. The gas retaining cavity within the piston rod is filled up to a fixed level with working liquid from the hydraulic system of the press. The bottom part of this cavity is connected to the second chamber of the pressing cylinder below the piston. This second chamber is connected to the hydraulic system of the press by means of a valve. The upper part of the gas retaining cavity 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 shut-off valve to the atmosphere.
REFERENCES:
patent: 3960201 (1976-06-01), Portalier
patent: 4154288 (1979-05-01), Borgen
patent: 4311185 (1982-01-01), Zimmerman
patent: 4334575 (1982-06-01), Miki et al.
Slavov Rashko R.
Vutov Stancho H.
Godici Nicholas P.
Institute po Metaloznanie I Technologia Na Metalite
Johnson Jerold L.
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