Abstract To ensure the temperature and formability of magnesium sheet metal transferring from a continuous oven, stamping of magnesium alloy sheet normally requires a setting of stationary heating oven in which lower-punch and binder are heated simultaneously. This paper studied the effect of unheated or extra heated upper-die with different temperatures on AZ31B magnesium sheet metalʼs formability in stamping. Forming limit curves (FLC) under different temperature upper-die were generated to analyze the temperature effect, which shows that the formability decrease significantly as upper-die temperature drops. Moreover, temperature fields simulated through thermo-mechanical coupling FEM simulation and microstructure of different specimen region indicate inhomogeneous mechanical properties due to temperature gradient, which results in different modes of crack initiation and propagation. Finally, FLC result was verified through a tryout stamping of automobile hinge cover.

中文翻译：

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上模温度对AZ31B镁合金薄板冲压成形性的影响

摘要 为保证镁合金板从连续炉中转移出来的温度和成形性，镁合金板冲压通常需要设置固定式加热炉，下冲头和粘结剂同时加热。本文研究了不同温度下未加热或额外加热的上模对AZ31B镁板材冲压成形性的影响。生成不同温度上模下的成形极限曲线（FLC）来分析温度影响，结果表明随着上模温度的降低，成形性显着下降。此外，通过热机械耦合有限元模拟和不同试样区域的微观结构模拟的温度场表明由于温度梯度导致的不均匀力学性能，这导致裂纹萌生和扩展的不同模式。最后，通过汽车铰链盖的试模冲压验证了 FLC 结果。