【摘要】 通过试验设备测定了半连续铸造100mm铝合金圆锭温度场分布,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,传热系数逐渐增大;在温度由400℃降至130℃的过程中,传热系数急剧增大,温度在130℃左右时达到最大,其值约为23kW/(m2·K);当温度继续降低时,铸锭表面传热系数又迅速减小。用三维有限元方法对铸造过程的凝固规律进行了数值模拟,结果发现模拟值和试验值基本符合。更多还原

【Abstract】 The relationship between heat transfer coefficient and surface temperature of aluminum alloy in water cooling stage is described by inverse method based on measuring temperature distribution of aluminum alloy ingot with diameters in 100 mm in semi-continuous casting with direct water-cooling. The calculated results show that the heat transfer coefficient is increased with decrease in surface temperature of the ingot, and especially decreased temperature from 400 ℃ to 130 ℃, the heat transfer coefficient is dramatically increased, where the maximum value about 23 000 W/(m~2·K) can be observed at 130 ℃. After that, the heat transfer coefficient is rapidly decreased with temperature decline. A FEM model was built to analyze the temperature field and shell growth of ingot. The calculated results are well in agreement with the experimental ones.更多还原