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US 4,049,248 AGranted
Dynamic vacuum treatment
AssigneeA/S Ardal og Sunndal Verk
InventorsOle Georg Gjosteen, Trygve Olavson Terum, Aksel Ola Aarflot
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AssigneeA/S Ardal og Sunndal Verk
InventorsOle Georg Gjosteen, Trygve Olavson Terum, Aksel Ola Aarflot
Estimating the term…
Method and apparatus for producing light metal alloys, in particular aluminum alloys, in which the desired alloying elements are first introduced into a vacuum furnace which is then evacuated, whereafter light metal melt is introduced into the furnace chamber by suction in the form of a free-falling metal jet which is thereby subjected to a vacuum treatment for reducing the contents of impurities, such as hydrogen, sodium, oxides and other non-metallic particles, therein. The free-falling metal jet is given such a configuration with respect to composition and flow pattern, such an average length as well as such velocity and direction that the alloying elements are readily dissolved and mixed into the melt in the vacuum furnace, whereby an alloy of desired quality is ready for casting immediately after termination of the vacuum treatment and alloying process.
Apparatus for use in the batch production of light metal alloys, said apparatus comprising a vacuum furnace with a vacuum chamber, said vacuum chamber having a completely closed bottom wall, means for evacuating said vacuum chamber, and nozzle means for introducing molten light metal into said vacuum chamber by suction, said nozzle means comprising at least one nozzle for forming at least one free-falling jet of molten light metal in said vacuum chamber, said at least one nozzle being directed into said vacuum chamber at an angle with the horizontal plane in the range of from 3.degree. to 20.degree..
Dependencies are inferred from the claim text.