| 摘要 |
The present invention relates, among other things, to a method for forming a workpiece ( 24 <SUB>0</SUB>) of a material having an exponential tensile stress-strain behavior into a thin-walled, hollow shell ( 24 <SUB>3</SUB>). In this method, the workpiece ( 24 <SUB>0</SUB>) is clamped on its periphery and is actively rotated about its center line (M). A freely rotatable spinning die ( 4 ) having an external side ( 4 a) with the desired shell shape ( 24 <SUB>3</SUB>) is pressed with a suitable pressure force against a workpiece side ( 24 a). At least one path-controlled spinning roller ( 14, 17 ) is pressed against the other workpiece side ( 24 b) so that the rotating workpiece ( 24 <SUB>0</SUB>) is formed into shell ( 24 <SUB>3</SUB>) exclusively by the local pressure forces, the relative velocity between the workpiece ( 24 <SUB>0</SUB>) and the at least one spinning roller ( 14, 17 ) and the force exerted on the workpiece ( 24 <SUB>0</SUB>) by the at least one spinning roller ( 14, 17 ) and the spinning die ( 4 ) being matched to one another such that the pressure forces applied to the workpiece ( 24 <SUB>0</SUB>) are below the yield strength of the workpiece ( 24 <SUB>0</SUB>). 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.
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