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:
Apr. 12, 2011
Filed:
Apr. 16, 2008
Jongcheol Shin, Kyonggi-Do, KR;
Jongwon B Park, Incheon, KR;
Inwook Hwang, Daejeon, KR;
Bob R. Powell, Jr., Birmingham, MI (US);
Thomas A. Perry, Bruce Township, MI (US);
Anil K. Sachdev, Rochester Hills, MI (US);
Jon T. Carter, Farmington, MI (US);
Jongcheol Shin, Kyonggi-Do, KR;
Jongwon B Park, Incheon, KR;
Inwook Hwang, Daejeon, KR;
Bob R. Powell, Jr., Birmingham, MI (US);
Thomas A. Perry, Bruce Township, MI (US);
Anil K. Sachdev, Rochester Hills, MI (US);
Jon T. Carter, Farmington, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
Some die cast aluminum alloy articles have internal cylindrical surfaces such as the round internal cylinder surfaces of a cylinder block for an internal combustion engine. During casting solidification molten aluminum alloys shrink against the metallic permanent mold tools used to mold and define such internal surfaces, and tend to stick to the tool surfaces making it difficult to remove the casting. The tendency of some aluminum casting alloys to solder to the tool can further intensify sticking. In this invention, an aluminum alloy sleeve is placed on and over the tool surface before casting and the sleeve isolates the tool from the molten aluminum. The sleeve becomes bonded to the casting and facilitates removal of the casting from the tool. The sleeve may be (and preferably is) fully machined from the internal casting surface. The sleeve may be of the same composition as the casting, in which case handling and recycling of machining chips would be facilitated. The practice of the invention is also applicable to die casting of magnesium alloys using magnesium sacrificial sleeves.