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:
Oct. 16, 2001
Filed:
Jul. 19, 1999
Wilhelm Arns, Paderborn, DE;
Arndt Birkert, Bretzfeld-Unterheimbach, DE;
Matthias Schroeder, Gruenendeich, DE;
DaimlerChrysler AG, Stuttgart, DE;
Abstract
A method and a device for manufacturing a hollow body from two plates, which are placed against one another and inserted into an internal high pressure forming tool. After the forming tool is closed, a fluid is introduced under high pressure between the plates by way of an expansion lance inserted between the plates. The plates are expanded until they abut the interior surfaces of the forming tool that match the shape of the hollow body. To achieve a process-reliable manufacture of the hollow body, the plates, before any internal high pressure is developed, are pinched in the thickness direction along the circumference of the opening that surrounds the inserted expansion lance by cooperation between the dies of the forming tool and the circumferential contour of the expansion lance that is oversize relative to the location between the plates at which the expansion lance is introduced. During the expansion process produced by internal high pressure, plate material is pushed by way of a stop located on the expansion lance and abutting the plate edges, toward the mold chamber formed by the interior surfaces of the dies.