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:
Jul. 03, 2001
Filed:
Apr. 07, 2000
Moinuddin Sirdar Rashid, Bloomfield Hills, MI (US);
Chongmin Kim, Springfield Township, MI (US);
Edward Frank Ryntz, Warren, MI (US);
Frederick Irvin Saunders, Sterling Heights, MI (US);
Ravi Verma, Shelby Township, MI (US);
Sooho Kim, Troy, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A method is disclosed for stretching magnesium-containing aluminum alloy sheet stock into intricate shapes such as are required in automotive body panels. The sheet stock, at a temperature in the range of about 400° C. to about 510° C., is stretched under the pressure of a working gas into conformance with the surface of a forming tool. The sheet forming pressure is increased continually in a controlled manner from ambient pressure to a final forming level in the range of about 250 psi to about 500 psi or higher. A portion of the sheet can experience strain rates substantially higher than 10,sec,and the forming of the sheet can be completed within 12 minutes.