Thyssenkrupp Steel Europe Ag

Thyssen Stahl Ag

Klaus Göhler

Thomas Flehmig

Friedrich Behr

Konstantinos Savvas

Uwe Kneiphoff

Klaus Blumel

Christian Hager

The aim of the invention is to provide a method for controlling the flow of material when deep-drawing a workpiece, which better utilizes the drawing capacity of a workpiece and produces a better shape accuracy, particularly of the bottom of the drawn part. The aim is achieved by a method in which the deep-drawing process is performed incrementally and in which at least one bead is incorporated into the flange region of the workpiece prior to each increment of the deep-drawing process. Due to this, the shape accuracy of the bottom can be improved and material accumulations in the flange zone can be prevented.

Method for controlling the flow of material when deep-drawing a workpiece, and deep-drawing device

The invention relates to a double-layered sheet metal with a first layer (5) of sheet metal comprising indented knobs (4.sub.I -4.sub.IV ; 4.sub.V -4.sub.VII ; 4.sub.VIII -4.sub.XIII), with several of these knobs forming the corner points of a geometrical segment (8.sub.I, 8.sub.II, 8.sub.III) of the first layer (5) of sheet metal, with a second layer (6) of sheet metal which is connected to the first layer (5) of sheet metal in the area of the tips (4a) of the knobs (4.sub.I -4.sub.IV ; 4.sub.V -4.sub.VII ; 4.sub.VIII -4.sub.XIII), and with a filling (7) made of filling material arranged in the void remaining between the layers (5, 6) of sheet metal. With such a double-layered sheet metal the danger of 'total failure' in the case of a load exceeding elastically endured deformation is reduced in that the geometrical segment (8.sub.I, 8.sub.II, 8.sub.III) comprises at least one indentation (10) by means of which any deformation of the double-layered sheet metal caused by a bending load is directed towards the filling (7) in the void. Furthermore, the invention relates to a method for producing such a double-layered sheet metal.

Double-layered sheet metal; process for its production and use of such

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Duisburg, Germany

Klaus Göhler