The paper deals with warm forming of magnesium sheet metal up to 350 deg C. To evaluate the material properties, flow stress curves and forming limit curves were determined at different forming temperatures by pneumatic bulging. To ensure a constant strain rate over the bulging process a pressure over time path was calculated based on the membrane theory. The calculated strain path and the resulting constant strain rate were verified by experimental investigations. Based on this investigation bulge test were carried out in order to determine the flow stress curves and the forming limit curves at different forming temperatures. It was shown that for higher temperatures the formability increases and the forming limit curve shifts to higher values. Based on these fundamental investigations of the formability of magnesium AZ 31 a license pocket plate of a personal car was formed at a temperature about 300 deg C: It was shown that a uniform temperature distribution of the tooling and therewith of the blank is essential for the forming success. To get information about the strain distribution over the component, the achieved strains are analyzed with an automated grid analysis. This analysis shows that the maximum achievable main strain is about 0.25, whereby the forming process is limited by the maximum achievable strains in the plane strain area.


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    Title :

    Pneumatic bulging of magnesium AZ 31 sheet metals at elevated temperatures


    Additional title:

    Druckluftbeulen von Magnesiumblech AZ 31 bei erhöhten Temperaturen


    Contributors:
    Siegert, K. (author) / Jäger, S. (author) / Vulcan, M. (author)

    Published in:

    CIRP Annals ; 52 , 1


    Publication date :

    2003


    Size :

    4 Seiten, 7 Bilder, 10 Quellen





    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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