铸轧工艺参数对铝熔体流热场影响的模拟研究

Numerical Simulation on the Influence of Roll-casting Process Parameters on the Fluid-thermal Field of Aluminum Melt

利用Fluent流体模拟软件对1030铝合金铸轧流热场进行数值模拟分析,进而分析铸轧速度和浇注温度对熔体流热场影响的规律。结果发现,Hunter式铸嘴型腔中铝熔体的流场受铸轧速度影响较大,占据主导作用。铸轧生产时,若铸轧速度越慢,则铝熔体有充分的时间进行分配,铸嘴出口处中部与两侧边部之间铝液的速度差越小,但会导致铝液在铸嘴内滞留的时间长、温降大;浇注温度对铝熔体的流、热场影响十分有限,仅影响边部区域的速度场、铸嘴整体温度分布。当铸轧速度为1.2 m/min、浇注温度为695℃时有利于熔体在铸嘴型腔内的流动和充型,有利于铸嘴布流稳定以及保证板坯的质量。

The fluid-thermal field of 1030 aluminum alloy by roll-casting was simulated by Fluent software,and the influence of casting speed and pouring temperature on fluid-thermal field was investigated.The results reveal that the flow field of aluminum melt in the cavity of Hunter nozzle is dominated by the casting speed.During the roll-casting process,the slower the roll casting speed is,the longer is allocated to the aluminum melt,and the smaller the velocity difference between the middle and the two sides of the nozzle outlet is,however,leading to the longer retention of the molten aluminum in the nozzle and the larger drop of temperature;Effect of pouring temperature on fluid-thermal field of aluminum melt is very limited,which only affects the velocity field in the edge area and the overall temperature distribution of the nozzle and hardly affects the distribution of fluid-thermal field.The condition that the casting speed is set at 1.2 m/min and the casting temperature is set at 695℃is conducive to the flow and filling of melt in the nozzle cavity,which is the most conducive to the flow stability of nozzle and the quality of slab.