热连轧铝温度场数值模拟及工艺参数影响分析

采用二维交替差分法建立了铝热连轧轧件温度计算模型,同时采用粒子群算法对模型参数进行了优化。经验证,优化后模型的计算精度在10℃以内;利用建立的温度模型研究了铝板带在热轧生产过程中的温度场变化规律,并分析了工艺参数对轧件终轧温度场的影响。研究结果表明,粗轧区轧件温度分布主要由接触导热与轧件内部的热生成两者共同决定,而精轧区还要受到乳液喷淋的影响;轧制速度越大,轧件终轧温度越高,横向温差越大;处于相同机架间的冷却集管的冷却能力几乎相同,而处于不同机架间的冷却集管,随着机架数的增加,冷却能力增强,横向温差随着开启度的增大而减小;轧件宽度对轧件终轧温度的影响很小,而横向温差随轧件宽度的增大而增大;随着乳化液温度的升高,轧件终轧温度升高,而乳化液温度对轧件横向温差没有影响。

Numerical simulation of temperature field model and analysis of process parameters influence in hot rolling aluminum

The two- dimensional alternating direction implicit finite difference method was adopted to establish the temperature field model of aluminum strip during hot rolling，and the model was optimized by measured data through the use of particle swarm optimization algorithm.According to verification，the calculation precision of temperature model was within 10 ℃.The temperature variations during strip hot rolling was analyzed with the temperature field model，as well as influence of process parameters on finishing temperature variations.The simulation results show that the temperature distribution during roughing rolling is mainly determined by both the thermal contact conductance and the heat generated inside the rolled piece，while emulsion spray cooling will play a role during finish rolling.The rolling speed is large，the finishing temperature and the transverse temperature difference are large.The cooling manifold between the same stand have the same cooling capacity，while the cooling capacity of the cooling manifold between different stands increases with the increase of the stand number.The transverse temperature difference decreases with the increase of opening degree.The strip width has little effect on the finishing temperature，but the transverse temperature difference increases with the increase of the strip width.The temperature of the emulsion is higher，the finishing temperature is higher，and the temperature of the emulsion has no effect on the transverse temperature difference.