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:
Mar. 14, 1989
Filed:
Dec. 21, 1987
Applicant:
Inventors:
James M Story, Pittsburgh, PA (US);
Matthew P Sklad, Hamilton, CA;
Assignee:
Aluminum Company of America, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
72 16 ; 72 60 ; 72709 ;
Abstract
A method of superplastically forming a part over period of a forming cycle in which a blank of the material is provided and heated to within a certain range of temperatures. An analytical model is provided that determines locations of the blank that will deform most rapidly when forming pressure is applied. As the forming pressure is applied, the displacements are monitored at such locations while the blank is being deformed. The strain rate is then calculated and feedback control is provided to affect the strain rate at such locations that will reduce the tendency of the blank or part to cavitate.