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The deformation mechanism of circular hole flanging by magnetic pulse forming
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2018-07-01 , DOI: 10.1016/j.jmatprotec.2018.02.022 Haiping Yu , Qiuli Zheng , Shoulong Wang , Yu Wang
Journal of Materials Processing Technology ( IF 6.3 ) Pub Date : 2018-07-01 , DOI: 10.1016/j.jmatprotec.2018.02.022 Haiping Yu , Qiuli Zheng , Shoulong Wang , Yu Wang
Abstract In this work, numerical simulation and experiments were used to study deformation behavior during a circular hole flanging of QCr0.8 copper alloy sheet by magnetic pulse forming and quasi-static circular hole-flanging with a steel punch. The deformation law, the bending effect, and the stress-strain field evolution of the annular deformation zone were compared for these two processes. The results showed that the inertia derived from high speed forming supposed over the remarkable effect of the radial tensile stress during the magnetic pulse hole-flanging, resulting in the “stretch–bending” effect at the die fillet and expanding the bidirectional elongated strain zone. Under the same experimental conditions, the height of the vertical wall of the hole-flanged part by magnetic pulse forming was remarkably higher than that resulting from hole-flanging with steel punch. At a constant hole-flanging coefficient of 0.56, the vertical wall of the hole-flanged part by magnetic pulse forming was increased 28.83% compared with the one produced with steel punch.
中文翻译:
磁脉冲成形圆孔翻边变形机理
摘要 本文通过数值模拟和实验研究了QCr0.8铜合金薄板磁脉冲成形圆孔翻边和钢冲准静态圆孔翻边过程中的变形行为。比较了这两个过程的环形变形区的变形规律、弯曲效应和应力应变场演化。结果表明,高速成形产生的惯性可能超过了磁脉冲孔翻边过程中径向拉应力的显着影响,导致模具圆角处的“拉伸弯曲”效应,并扩大了双向拉长应变区。在相同的实验条件下,磁脉冲成形的孔翻边部分的垂直壁高度明显高于钢冲孔翻边的高度。在0.56的恒定孔翻边系数下,磁脉冲成形孔翻边部分的垂直壁比钢冲头增加了28.83%。
更新日期:2018-07-01
中文翻译:
磁脉冲成形圆孔翻边变形机理
摘要 本文通过数值模拟和实验研究了QCr0.8铜合金薄板磁脉冲成形圆孔翻边和钢冲准静态圆孔翻边过程中的变形行为。比较了这两个过程的环形变形区的变形规律、弯曲效应和应力应变场演化。结果表明,高速成形产生的惯性可能超过了磁脉冲孔翻边过程中径向拉应力的显着影响,导致模具圆角处的“拉伸弯曲”效应,并扩大了双向拉长应变区。在相同的实验条件下,磁脉冲成形的孔翻边部分的垂直壁高度明显高于钢冲孔翻边的高度。在0.56的恒定孔翻边系数下,磁脉冲成形孔翻边部分的垂直壁比钢冲头增加了28.83%。