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针对镁合金热连轧过程中已发生边裂的问题,采用ANSYS变形热力耦合数值分析法,对AZ31镁合金板在350℃、0.5 m·s-1轧制速度下的三道次连轧过程进行了有限元模拟,并应用LS-DYNA后处理器对轧制过程中镁板不同部位的温度、应力分别进行了分析,并对模拟结果进行实验验证。研究结果表明:热连轧过程中,首道次镁板温降值较大,而且不同位置的温降幅值不同;此外,轧制过程中镁板边部中心层应力始终大于中部表层应力值。轧制过程中温度的不均匀变化以及边部应力集中使得镁合金在热连轧过程中易于发生边裂。
Aiming at the problem that edge cracks occurred in the process of hot rolling, the three-step rolling process of AZ31 magnesium alloy plate at 350 ℃ and 0.5 m · s-1 rolling speed was analyzed by ANSYS numerical simulation. The finite element simulation was carried out. The temperature and stress of different parts of the magnesium plate in the rolling process were analyzed respectively by LS-DYNA postprocessor, and the simulation results were verified by experiments. The results show that during the hot rolling process, the temperature drop of the first pass magnesium plate is larger and the temperature drop amplitude is different at different positions. In addition, the stress of the central part of the magnesium plate in the rolling process is always higher than the surface stress in the middle part. The uneven temperature during the rolling process and the concentration of the edge stress make the magnesium alloy prone to edge cracks during hot strip rolling.