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US 4,024,056 AGranted
Filtering of molten metal
AssigneeSwiss Aluminium Ltd.
InventorsJohn C. Yarwood, James E. Dore, Robert K. Preuss
Life of this patent
Estimating the term…
Abstract
The disclosure teaches an improvement in the filtration of molten metal, especially aluminum, using a removable filter plate. The filter plate is provided with a bevelled peripheral surface mating with a like bevelled surface in a filter chamber so that the filter plate can be conveniently inserted in the chamber and removed therefrom.
Claims23
In the filtration of molten metal with a removable filter plate, the method which comprises:
- providing a filter chamber having a metal inlet and a metal outlet and having a bevelled wall surface adapted to be partitioned by a filter plate;
- providing a filter plate for filtration of molten metal having an open cell structure characterized by a plurality of interconnected voids, said plate having a bevelled peripheral surface adapted to mate with the bevelled wall surface of the filter chamber and including a resilient sealing means on said bevelled filter plate surface resistant to said molten metal, wherein said filter plate is a ceramic foam filter plate having an open cell structure characterized by a plurality of interconnected voids surrounded by a web of said ceramic;
- inserting said filter plate and sealing means in said filter chamber to engage the bevelled wall surface of the filter chamber;
- and
- thereafter passing molten metal through said filter plate for discharge through said outlet, wherein the surface of the filter plate is maintained below the level of the molten metal.
2 more elements
An improved filtration apparatus comprising:
- a filter chamber having a metal inlet and metal outlet and having a bevelled wall surface adapted to be partitioned by a filter plate;
- a ceramic foam filter plate for the filtration of molten metal having an open cell structure characterized by a plurality of interconnected voids surrounded by a web of said ceramic, said plate having a bevelled peripheral surface mating with the bevelled wall surface of the filter chamber;
- and a resilient sealing means between and engaging said mating surfaces resistant to said molten metal, wherein the filter plate partitions the filter chamber so as to be readily insertable therein and removable therefrom.
Dependencies are inferred from the claim text.