铝材铸轧过程中成型界面传热行为的仿真

在铝材铸轧过程中，材料凝固和冷却所释放的热量都要通过成型界面传导给辊套，并最终由辊套内部的冷却水带走。在分析铸轧过程中传热特点的基础上，建立了传热过程的基本方程与数学模型，并针对3种典型的铸轧工况进行了界面传热行为的仿真研究。结果表明：随着铸轧过程的进行，成型界面的温度差值和热流密度均显著减小，因此，热量传递主要在铸轧区的前半段进行；随着铸轧速度的提高，铸轧区内辊套表面的最高温度不断下降，导致成型界面上的温度差值不断增大，界面热流密度增大并趋于均匀，从而提高了界面的传热能力。

Simulation of heat transfer behavior of shaped interface in aluminum cast-rolling process

In cast-rolling process of aluminum, the heat released during solidification and cooling is transferred to rollers through shaped interface at first, and finally taken away by inner cooling water of rollers. The basic equation and mathematics model of heat transfer were established on the basis of analysis on heat transfer characteristic for aluminum cast rolling; and the heat transfer behaviors of shaped interface for three kinds of typical conditions were simulated. The results show that, the temperature gap and heat flow density decrease markedly with the process of cast-rolling proceeding, so the heat is transferred mainly on the front part of cast-rolling zone; with increasing cast-rolling speed, the highest temperature of roller surface decreases in the cast-rolling zone, resulting in that the temperature gap of shaped interface increases continuously and the heat flow density increases, thereby the heat transfer capacity on shaped interface is improved.