Abstract
Springback behavior of 6016 aluminum alloy in hot stamping was investigated by a series of experiments under different conditions using V-shape dies and a finite element model which was validated reliable was used to further elucidate the springback mechanism. The effects of initial blank temperature, blank-holding force, die closing pressure and die corner radius were studied. It is found that springback decreases remarkably as the initial blank temperature rises up to 500 °C. The springback also reduces with the increase of die holding pressure and the decrease of die corner radius. Under different initial temperatures, the influence of blank-holding force is distinct. In addition, the bending and straightening of the side wall during the stamping process is found to interpret the negative springback phenomenon.
摘要
为了研究 6016 铝合金热冲压的回弹现象, 利用 V 型冲压模具对 6016 铝合金进行不同工艺参数条件下的热冲压实验。 为了进一步分析回弹机理, 建立了有限元模型并验证了其准确性。 研究了板料初始温度、 压边力、 保压压力和模具圆角对回弹的影响。 结果表明, 当板料初始温度上升到 500 °C 时, 回弹显著下降。 增大保压压力和减小模具圆角同样也可以降低回弹。 在不同的板料初始温度下, 压边力对回弹的影响是不同的。此外, 冲压过程中V型件侧壁的先弯曲后校直会导致负回弹。
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Foundation item: Projects(U1564202, 51705018) supported by the National Natural Science Foundation of China; Project(FRF-TP-15-087A1) supported by the Fundamental Research Funds for the Central Universities, China
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Ma, Wp., Wang, By., Xiao, Wc. et al. Springback analysis of 6016 aluminum alloy sheet in hot V-shape stamping. J. Cent. South Univ. 26, 524–535 (2019). https://doi.org/10.1007/s11771-019-4024-8
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DOI: https://doi.org/10.1007/s11771-019-4024-8