AZ31マグネシウム合金板の温間プレス成形性

概要

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Press forming test apparatus in the ranges of 673K from room temperature was developed for evaluating characteristic of warm press formability in magnesium alloy sheets. By using of this apparatus, deep drawing test for drawability, stretching test for stretchability, bore expanding test for stretch-flanging formability, and hat-shape bending test for fixability have been carried out on four kinds of AZ31 magnesium alloy sheets. As a result, limiting drawing ratio (LDR) becomes 2.5 at the time of forming temperature 433K, stretching deformation height is improved above temperature 413K and stretch-flanging formability is secured at 473K. Shape fixability is improved as the forming temperature is raised, and at 573K, spring back is reduced to almost zero. A characteristic of warm forming varies with a production condition of materials, and with percentage of elongation of materials, and strong correlation consists.
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