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:
Sep. 17, 1991
Filed:
Sep. 08, 1989
Kim A Stelson, Edina, MN (US);
Woon-Chung Wang, Minneapolis, MN (US);
Regents of the University of Minnesota, St. Paul, MN (US);
Abstract
A tube bending die rotates to cause the tube to be bent over the outer periphery of the die and uses a drive which includes a transducer for measurement of the bending moment required for bending the tube. The bending moment signal is used in conjunction with a signal indicating the total amount of bend to control the number of degrees of bending and to overbend the tube an amount which is a function of the bending moment required to bend the tube, to compensate for springback. In its simplest form, the bending die is a rotating element, and the drive for rotating the die can include a force measuring link which can be converted into bending moment required for bending is used as a measured parameter for an equation which provides a signal indicating the amount of angular overbending needed to compensate for springback in an online, real time process.