Kuka Werkzeugbau Schwarzenberg Gmbh

Thyssenkrupp Presta Teccenter Ag

Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Frank Schieck

Daniel Paul

Jürgen Meusel

Juergen Meusel

Robert Reichelt

Rico Demuth

Jens Gentzen

Alexander Paul

Lonka B&uuml;rgel

Lonka Burgel

The invention relates to a method for producing a tubular structural part by means of hydroforming. An assigned end of a supporting tube () is inserted into an opening in an end piece () and then widened by a pressurized fluid being applied to it and is connected to the end piece () with a press fit. The opening () has a first portion () with a first inner cross section, which is greater than the outer cross section of the assigned end of the supporting tube (). According to the invention, the first portion () is adjoined by a second portion (), in a step-shaped manner so as to form an edge (). The inner cross section of the second portion () is smaller than the outer cross section of the assigned end of the supporting tube (). In the method according to the invention, the supporting tube () is first inserted with its corresponding end into the first portion (), before the edge () cuts into the material of the supporting tube () in a further pushing-in movement.

Method and parts for making a tubular workpiece, in particular a built-up camshaft

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.

Method and apparatus for the hydraulic forming of workpieces

For shaping small radii in edge and corner regions of preformed workpieces or blanks, the invention provides for a postforming of exclusively said edge and corner regions by high liquid pressure. For performing the method an apparatus has a die part (forming insert) with expansion spaces constructed in its edge and corner regions.

Method and apparatus for forming blanks

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Lauter, Germany

Frank Schieck