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Eine Möglichkeit zur Berücksichtigung der elastischen Werkzeugeigenschaften bei der Blechumformsimulation

Prof. K. Roll (DaimlerChrysler), J. Hoffmann (FH Lausitz) The simulation of metal forming processes, in the field of massive forming as well as for sheet metal forming processes, has reached such a high level, that provides the possibility to carry out realistic simulations of industrial forming processes. At present the simulation of sheet metal forming processes is used in a standardized procedure already during the design of the forming tools in order to assure the producibility of sheet metal parts at an early stage. The simulation and computer-supported compensation of springback has become more and more important. Results of springback simulations demonstrate the ability that springback-related shape deviations can be calculated qualitative accurate and are quantifiable even within a small bandwidth. The numerically predicted shape deviations provide valuable indications for the compensation due to an adapted redesign of the tool geometry or of the forming process. Since the tools are presently still modelled as rigid bodies this modelling approach leads especially for high and highest strength steels to a more and more significant loss in simulation accuracy. Thus an enhancement of the tool models including the elastic properties is necessary. In this paper a method to account for the tools elastic properties in the forming simulation is described. The method makes use of the substructure technology, which is well known from static simulations.

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