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. 12, 2002
Filed:
Dec. 03, 1999
Lonka Bürgel, Pöhla, DE;
Frank Schieck, Lauter, DE;
KUKA Werkzeugbau Schwarzenberg GmbH, Schwarzenberg, DE;
Abstract
Internal high pressure forming at present takes place by exerting a pressure between sheet metal blanks fixed by a marginal weld. It has already been proposed to deform under high internal pressure sheet metal blanks merely placed on one another in a combined clamping and sealing die. Problems arise with regards to the sealing and material flow. Thus, to overcome the aforementioned disadvantages, the invention proposes a method for forming at least one workpiece under high liquid or hydraulic pressure, in which the workpiece, during pressure build-up, is initially marginally clamped in per se known manner and in the final phase of forming to the desired final shape of the workpiece (sizing) the marginal area of the workpiece is freed. It also proposes an apparatus ( ) for the hydraulic forming of at least one workpiece by means of a forming die ( ) having an upper and a lower part ( ), which clamp the workpiece in marginal areas whilst allowing an also differing material flow, the forming die ( ) being surrounded by a pressure casing ( ) separate therefrom.