Metal founding – Process – Shaping liquid metal against a forming surface
Patent
1994-04-12
1995-11-28
Lin, Kuang Y.
Metal founding
Process
Shaping liquid metal against a forming surface
164459, 164473, 164487, B22D 1100, B22D 2702
Patent
active
054699118
ABSTRACT:
A method for improving the surface quality of electromagnetically cast aluminum alloy ingot includes the addition of an effective amount of calcium prior to the ingot head of an ingot mold of an electromagnetic casting station. The addition of calcium is regulated such that the aluminum alloy cast ingot contains a maximum of 0.05 weight percent calcium. Addition of the calcium prior to the ingot head produces a cast ingot which is generally free of surface imperfections on side surfaces thereof so that the cast ingot can be directly worked or rolled to a desired gauge without a scalping or surface conditioning treatment. The calcium can be added during melting, alloying, filtering, degassing or transferring of the molten aluminum prior to casting. An electromagnetically cast aluminum alloy ingot is produced, preferably an AA5182 can end stock alloy, which is essentially free of surface imperfections to permit direct rolling or other working of the cast ingot without a surface conditioning treatment.
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Biddison Alan M.
Lin Kuang Y.
Reynolds Metals Company
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