Metal founding – Control means responsive to or actuated by means sensing or... – Control of feed material enroute to shaping area
Patent
1982-01-29
1984-08-07
Godici, Nicholas P.
Metal founding
Control means responsive to or actuated by means sensing or...
Control of feed material enroute to shaping area
164157, 164305, B22D 1714, B22D 1732
Patent
active
044637934
ABSTRACT:
A method and apparatus for casting molten metal in a die casting machine having matching die assemblies movable between open and closed positions, a plunger for injecting molten metal into the die cavity, a vacuum system for evacuating the die cavity during injection of molten metal and a vacuum control valve for opening and closing the exhaust passage through which the air is evacuated. A fluid cylinder is mounted on one die assembly with its piston rod coupled to the valve rod of the vacuum control valve. The fluid cylinder has a solenoid-operated control valve actuated by an electric switch operated by movement of the molten metal injection piston so that the vacuum control valve begins to close at a predetermined point during the injection stroke. The injection plunger also actuates a timer at the same time it actuates the solenoid-operated control valve. As the vacuum control valve approaches its closed position, it actuates another switch that initiates the final injection stroke of the injection piston. If the latter switch is not actuated by the time the timer times out, the injection plunger is retracted before injection of molten metal is completed, so that no molten metal can enter the vacuum passages due to incomplete closure of the vacuum valve.
REFERENCES:
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patent: 3006043 (1961-10-01), Goldhammer
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patent: 3172174 (1965-03-01), Johnson
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patent: 4239080 (1980-12-01), Hodler
Batten, Jr. J. Reed
Bayerisches Druckguss-Werk Thurner KG
Godici Nicholas P.
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