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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。
The temperature distribution of the semi-continuous casting Φ100mm aluminum alloy ingot was measured by the equipment. Based on this, the relationship between the heat transfer coefficient and the surface temperature of the ingot was obtained by the inverse method. Calculations show that as the ingot surface temperature decreases. The heat transfer coefficient increases gradually. When the temperature is reduced from 400 ℃ to 130 ℃, the heat transfer coefficient increases sharply and reaches the maximum when the temperature is about 130 ℃. The maximum value is about 23000W / (m ~ 2 · K) ; When the temperature continues to decrease, the ingot surface heat transfer coefficient decreases rapidly again. The solidification regularities of the casting process were numerically simulated with the 3D finite element method. The simulated and experimental values were in good agreement.