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. 17, 2007
Filed:
Apr. 08, 2004
Erich Sieger, Friedrichshafen, DE;
Erich Sieger, Friedrichshafen, DE;
Firma Erich Sieger, Friedrichshafen, DE;
Abstract
The present invention relates, among other things, to a method for forming a workpiece () of a material having an exponential tensile stress-strain behavior into a thin-walled, hollow shell (). In this method, the workpiece () is clamped on its periphery and is actively rotated about its center line (M). A freely rotatable spinning die () having an external side () with the desired shell shape () is pressed with a suitable pressure force against a workpiece side (). At least one path-controlled spinning roller () is pressed against the other workpiece side () so that the rotating workpiece () is formed into shell () exclusively by the local pressure forces, the relative velocity between the workpiece () and the at least one spinning roller () and the force exerted on the workpiece () by the at least one spinning roller () and the spinning die () being matched to one another such that the pressure forces applied to the workpiece () are below the yield strength of the workpiece (). In addition, the present invention relates to a device for carrying out the method. Moreover, the present invention relates to a method and a device for forming a workpiece of a material which was previously only formable at known hot-forming temperatures, but as a result of the present invention, is now able to be formed into a thin-walled, hollow shell at a temperature below the hot-forming temperature known for the material of the workpiece.