为建立磁脉冲辅助冲压成形(EMAS)工艺的有效性,采用准静态平面应变预拉伸和动态磁脉冲成形相结合的方法对5052-O铝合金板材的准静态/动态平面应变状态复合成形极限进行了试验研究.结果表明:准静态/动态复合加载过程能显著改善该铝合金板材的室温成形性;准静态/动态平面应变复合成形极限比准静态平面应变成形极限有显著提高,相似或者略高于完全磁脉冲平面应变成形性,且随着准静态预应变水平的增加,准静态/动态复合变形成形极限变化不大.预变形的存在不会削弱复合成形过程的极限变形能力.
In order to establish the efficacy of electromagnetically assisted sheet metal stamping ( EMAS) , the plan-strain formability of 5052 - O aluminum alloy sheet in a hybrid quasi-static/dynamic process was experimentally investigated using a combined method of quasi-static plan-strain pre-straining and the pulsed electromagnetic forming ( EMF). The experimental results indicate that the hybrid quasi-static/dynamic forming process can remarkably improve the formability of 5052-O aluminum alloy sheet at room temperature. The hybrid plan-strain formability is dramatically increased beyond that exhibited in quasi-static tests, and a little higher or at least similar with that obtained in the fully dynamic EMF process. With the increase of quasi-static pre-straining levels, the effect of quasi-static pre-straining on hybrid forming limits is insignificant, and quasi-static pre-straining does not decrease the formability of hybrid quasi-static/dynamic forming.
参考文献
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