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Investigations on the Accuracy of Reproduction of Electrohydraulic Forming and Development of an Electrohydraulic Forming Machine

  • R. Zeller
Chapter

Summary

The accuracy of reproduction was investigated, by drawing conical hollow bodies with rotational symmetry, as dependent on the stored energy of the capacitors, the shape of the die cavity and the vacuum between sheet metal blank and die cavity. Also the limiting drawing ratio was investigated. The results follow. A cylindrical hollow body could not be produced, while there are certain limits for the cone angle. Optimum values were found for the stored energy and the vacuum. The long operational time in the water reservoir and the low efficiency led to the construction of a closed die. Therefore a machine for electrohydraulic forming with pneumatic sequence control was developed. By expanding tubes with this machine a cycle time of 40 seconds was achieved.

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References

  1. 1.
    H. Muller, 1969. ‘Vorgänge beim elektrohydraulischen und elektromagnetischen Umformen von metallischen Werkstücken’, Berichte aus dem Institut für Umformtechnik, Universität Stuttgart, Girardet, Essen, No. 11.Google Scholar
  2. 2.
    H. G. Baron, 1964. ‘Spring-back and metal flow in forming shallow dishes by explosives’, Intern. J. Mech. Sci, 6, 435–44.CrossRefGoogle Scholar
  3. 3.
    R. Zeller, 1972. ‘Untersuchungsergebnisse über die Abbildegenauigkeit bei der elektrohydraulischen Umformung’, Industrie-Anzeiger, 94, No. 2, 20–4.Google Scholar

Copyright information

© Macmillan Publishers Limited 1973

Authors and Affiliations

  • R. Zeller
    • 1
  1. 1.Institut für UmformtechnikUniversität Stuttgart (TH)Germany

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