Present stretch-forming methods generally require complex machine tool systems. The highlighted benefits mentioned in the descriptive literature on stretch-forming methods do not apply to the production of car body panels in terms of quality and cost requirements. State of the art stretch-forming tool concepts appear to be less efficient and more cost intensive when applied for automobile outer panels, such as doors, roofs or trunk lids, than in other fields of application. At the Institute for Metal Forming Technology IFU in Stuttgart, a new stretchforming technology has been developed with the objective of fulfilling the above-mentioned requirements. The newly developed SCS Technology allows for the application of highly efficient processes of combined plane stretching and deep drawing using low cost tools. The research and development has been supplemented by newly defined benchmarking methods. The application of new SCS related development approaches provides for the construction of highly effective tools in terms of investment and process costs. This paper describes general features of the SCS Technology, applied benchmarking methods at early stages of development, prototype tools for fundamental research work and a SCS based layout for a close-toproduction tool. A basic validation and optimization of the tool concept for combined lateral stretching and deep drawing was performed in FEM process simulations using the pre-processor Dynaform 5.5 and the LS-Dyna Solver 970-6763. In over 50 optimization loops, several tool layouts combined with different bead set geometries have been examined, applying the newly developed benchmarking methods for appropriate estimation. Exemplary results of the performed feasibility studies, representing one half of the examined part both at the prestretched state prior to the first punch contact, and at the final state are shown. The experimental try-out of the developed tool was performed with a 4000kN single-acting hydraulic press. The tool was built in like common drawing tools without any special features or modifications to the drawing press. The tool function affords basically the required drawing force on the press ram. An application of the drawing cushion of the press is not required. The drawing force was set to 200kN.


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    Titel :

    Development of new stretch-forming technologies for car body outer skin panels


    Weitere Titelangaben:

    Entwicklung neuer Streckzieh-Technologien für Karosserieaußenteile


    Beteiligte:


    Erscheinungsdatum :

    2008


    Format / Umfang :

    12 Seiten, 11 Bilder, 1 Tabelle, 16 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Datenträger


    Sprache :

    Englisch




    Development of new stretch-forming technologies for car body outer skin panels

    Vlahovic,D. / Liewald,M. / Univ.Stuttgart,DE | Kraftfahrwesen | 2008




    Stretch forming auto panels

    Mote, H. | Engineering Index Backfile | 1967