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Formability Enhancement of Al-Mg Sheet by Using Hydro-Mechanical Forming

Hydro-mechanical forming of Al sheet was investigated in the present study in order to fabricate automotive part having a complicated shape using Al 5052 alloy with a conventional formability which has been known to be quite lower compared to deep drawing steels. We have designed the hydro-mechanical forming in which Al sheet was drawn to a kind of preform step following gas blow forming for final accurate geometry. In order to judge a formability enhancement of Al sheet in terms of forming process, model geometry came from a practical automotive part which had quite depth with complicated curvatures, which was proven that a single sheet forming could not gave a successful part. Experimentally, we succeeded to make the model part with accurate dimension. The optimum forming conditions for respective forming steps were considered most important technical features of this hydro-mechanical. Also, the effort to avoid detrimental microstructure evolutions was given and discussed for a practical application.