铸造铝合金圆锭温度场实验研究和数值模拟

Experimental research and numerical simulation for the temperature field in the casting of Aluminum alloys

通过设备测定了半连续铸造Φ100mm铝合金圆锭温度分布,以此为基础,通过反算法得到直接冷却半连续铸造铝合金水冷段换热系数与铸锭表面温度的关系。计算表明,随着铸锭表面温度的降低．换热系数逐渐增大;在温度由400℃降至130℃的过程中,换热系数急剧增大,温度在130℃左右时达到最大,其最值大约为23000W/(m^2·K);当温度继续降低时,铸锭表面换热系数又迅速减小。并用三维有限元对铸造过程的凝固规律进行了数值模拟,模拟值和实验值基本吻合。

Temperature distribution in the section of ingot with diameter value of 100 mm is obtained in the laboratory. Based on it, the relation between heat transfer coefficient and the measured surface temperature is discussed using inverse method. The calculated results show that heat transfer coefficient increase with ingot surface temperature decrease, and especially at tempera- ture range from 400℃ to 130℃, heat transfer coefficient increase greatly and the heat transfer coefficient maximum is about 23000W/（m^2· K） at 130℃. After that, the heat transfer coefficient decrease with temperature declining. A three dimension FEM model is built to analysis the temperature field and shell growth of ingot. Comparison of calculated results with experimental data show good agreements.