The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 28, 1995
Filed:
Apr. 12, 1994
Gary B Parker, Moulton, AL (US);
Reynolds Metals Company, Richmond, VA (US);
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.