In this paper the effects of pulsating blankholder forces in deep draw processes for sheet metal parts are discussed. Areas with and without tangential compressive stresses in the flanges, which are located between the binders, are discussed separately. Areas without tangential compressive stresses can be simulated by a special friction strip-draw test using a pulsating normal force ( representing the blankholder force ). Investigations using this equipment show that by pulsating blankholder forces it is possible to avoid galling and to reduce the friction force. Areas with tangential compressive stresses can be simulated by deep drawing axissymmetric cups using a pulsating blankholder force. Investigations with this equipment show that without increasing the danger of wrinkling the friction forces can be reduced by pulsating blankholder forces, when a certain frequency limit is reached. This enlarges the gap between the wrinkling- and the fracture-border for the blankholder force over the stroke. The maximum depth can be increased. Further investigations with a 4000 kN hydraulic Press are in investigation.


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    Titel :

    Pulsating Blankholder Technology


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Body Engineering Conference & Exposition ; 1999



    Erscheinungsdatum :

    28.09.1999




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Pulsating blankholder technology

    Ziegler,M. / Univ.Stuttgart,DE | Kraftfahrwesen


    Pulsating blankholder technology

    Ziegler,M. / Univ.Stuttgart,IFU,DE | Kraftfahrwesen | 1999


    Pulsating blankholder force

    Siegert,K. / Ziegler,M. / Univ.Stuttgart,DE | Kraftfahrwesen | 1997


    Pulsating Blankholder Force

    Siegert, K. / Ziegler, M. / Society of Automotive Engineers | British Library Conference Proceedings | 1996


    Pulsating Blankholder Force

    Siegert, K. / Ziegler, M. | SAE Technical Papers | 1997