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基于热成形过程力-热-相变结合的本构应变模型,以汽车门梁零件为例,运用有限元分析方法对AISI-1045钢板高温热成形及淬火过程进行数值化模拟研究。研究结果表明,在模外冷却自由淬火后,除去由于马氏体生成硬度增加外,相变效应对零件最终形状产生的影响远大于冷却收缩的影响;随模冷却时,在同一节点处,模具初始温度为20℃时,发生相变塑性应变的可能性要大于温度为150℃时发生的相变塑性应变,而且还比其先发生相变塑性应变,但后者回弹研究参数的回弹量要大于前者对应的回弹量。
Based on the constitutive model of strain-heat-phase transition in thermoforming process, taking the automobile door-beam component as an example, numerical simulation of the high-temperature thermoforming and quenching process of AISI-1045 steel was carried out by finite element analysis. The results show that the effect of phase transformation on the final shape of the part is much larger than that of the cooling shrinkage after the free-quenching of out-of-mold cooling, except for the increase of the hardness of the martensite. With the cooling of the mold, at the same node, When the initial temperature is 20 ℃, the possibility of phase transformation plastic deformation is greater than the phase transformation plastic strain occurred at the temperature of 150 ℃, but also the phase transformation plastic strain occurs first, but the latter rebound study parameters rebound The amount should be greater than the former corresponding to the amount of springback.