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:
Jan. 08, 2013
Filed:
Dec. 21, 2011
Mark Anderson, Spokane Valley, WA (US);
Todd F. Bischoff, Spokane Valley, WA (US);
James Boorman, Greenacres, WA (US);
Wayne J. Fenton, SpokaneValley, WA (US);
David Sinden, Valleyford, WA (US);
John Steven Tingey, Rathdrum, ID (US);
Robert Bruce Wagstaff, Greenacres, WA (US);
Mark Anderson, Spokane Valley, WA (US);
Todd F. Bischoff, Spokane Valley, WA (US);
James Boorman, Greenacres, WA (US);
Wayne J. Fenton, SpokaneValley, WA (US);
David Sinden, Valleyford, WA (US);
John Steven Tingey, Rathdrum, ID (US);
Robert Bruce Wagstaff, Greenacres, WA (US);
Novelis Inc., Toronto, Ontario, CA;
Abstract
An exemplary embodiment provides a method of eliminating a shrinkage cavity in a metal ingot cast by direct chill casting. The method involves casting an upright ingot having an upper surface at an intended height. Upon completion of the casting, the lower tip of the spout is maintained below the molten metal near the center of the upper surface. The metal flow through the spout is terminated and a partial shrinkage cavity is allowed to form as metal of the ingot shrinks and contracts. Before the partial cavity exposes the lower tip of the spout, the cavity is preferably over-filled with molten metal, while avoiding spillage of molten metal, and then the flow of metal through the spout is terminated. These steps are repeated until no further contraction of the metal causes any part of the upper surface to contract below the intended ingot height.