Alusuisse Technology & Management Ltd.

Bayrisches Druckguss-werk Thurner Gmbh & Co. Kg

Bayerisches Druckgusswerk Thurner Kg

Hans Thurner

A process for die-casting aluminum and aluminum alloys is such that the molten metal is introduced into a filling chamber and injected from the filling chamber into a mold cavity by a piston. The mold cavity is evacuated in advance, after which it is flooded with oxygen. After flooding with oxygen and before injecting the molten metal into it, the mold cavity is again evacuated. Finally, the molten metal is injected into the hollow mold cavity. The process enables die-cast parts to be produced with low tendency to forming pores and blisters.

Process for die-casting light-weight metals

For cooling, cleansing and/or lubricating purposes on a pressure casting machine 14 there is arranged an apparatus 10 for wetting mold surfaces 12 by spraying pressurized fluid thereon, which comprises a spraying head 40 provided with spraying nozzles 42 apt to be adjusted as regards direction, in which spraying head channels 44 and adjustable throttle valves 46 are disposed. To form such apparatus such that it is suited for the selective treatment of the different mold surfaces, no expensive adaptation operations being necessary with each change of mold and/or each re-use of such mold, that moreover a rapid automatic pressure casting operation is guaranteed and that high manufacturing and storage costs are avoided. The spraying head 40 is composed of stationary member 48 and an easily exchangeable spraying nozzle carrier 54 sealingly resting thereagainst, the stationary member containing channels 44 and throttle valves co-acting with said channels and being connected to the movable holding elements, and the spraying nozzle carrier as a relatively simple and inexpensive constructional member essentially being only provided with spraying nozzles 42 and, if necessary, adjusting elements for adjusting throttle valve 46.

Apparatus for wetting mold surfaces with a liquid

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.

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Baldham, Germany

Hans Thurner