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通过试验法测定了铸造过程中准100 mm的铝合金铸锭近表面的动态温度,采用逆向法计算出其水冷段的换热系数。结果表明,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,在130℃左右时达到最大,其最大值大约为23 000 W/(m.K);当温度继续降低时,铸锭表面换热系数迅速减小。最后分析了换热系数变化的原因。
The dynamic temperature near the surface of the ingot of 100 mm aluminum alloy during the casting process was determined by the test method. The heat transfer coefficient of the water-cooled section was calculated by the inverse method. The results show that the heat transfer coefficient increases with the decrease of the ingot surface temperature. During the temperature decrease from 400 ℃ to 130 ℃, the heat transfer coefficient increases sharply and reaches the maximum at about 130 ℃. About 23 000 W / (mK); as the temperature continues to decrease, the surface heat transfer coefficient of ingot decreases rapidly. Finally, the reasons for the change of heat transfer coefficient are analyzed.