镁合金薄带双辊铸轧过程的数值模拟

基于立式薄带双辊铸轧工艺的特点,采用有限元法求解镁合金薄带双辊铸轧过程的三维宏观传输方程,并应用ANSYS软件的智能网格划分技术,实现了对铸轧过程中熔池内部温度场、速度场及凝固过程的耦合模拟.分析了铸轧速度及浇注温度等主要工艺参数对熔池内流场、温度场和凝固终了点的影响规律.研究结果表明,随着浇注温度和铸轧速度的增加,熔池出口处的温度升高,凝固终了点向熔池出口处移动.通过对模拟结果的讨论,给出了适合镁合金薄带铸轧过程的工艺参数:浇注温度为640~660℃,铸轧速度为20~30 m/min.

Numerical Simulation of Twin-Roll Casting Magnesium Alloy Strip Process

Based on the characteristics of vertical type twin-roll casting process， the finite element method was used to analyze the three-dimensional steady conservation equations for transport phenomena in the pool region of the twin-roll strip casting for the magnesium alloy.The smart-sizing algorithm of ANSYS software was used to divide finite element mesh， and the coupled simulations of temperature field， velocity field and the solidification process in the molten pool were performed. The effects of main control parameters， such as the casting speed， pouring temperature on the flow field， temperature field and the final point of solidification in the molten pool， were analyzed. The results showed that with the increase of the pouring temperature and the casting speed， the temperature at the exit of the molten pool increases and the final point of solidification moves toward the exit. On the basis of the simulation results， the optimized process parameters of twin-roll casting process for Mg alloy are also given as: the pouring temperature is in 640~660℃ and the casting speed is in 20~30m/min.