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为了提高冷却系统对工作辊温度的控制能力,建立工作辊与冷却液间三维流热耦合模型,研究冷却结构参数及其安装尺寸对工作辊冷却效果的影响。分析喷嘴倾斜角度、喷嘴间距以及冷却液的喷射角度对冷却效果的影响。结果表明:单个喷嘴射流区域内,离中间冲击区域越远对流换热系数衰减的越快,中间区域的平均对流换热系数约为边部的4倍;在适当减小喷嘴间距的基础上,调整喷嘴的倾斜角度,可以使工作辊冷却更均匀,且冷却效率更高。经某厂二辊可逆热轧机验证,可知改进后的冷却结构对板带中心凸度的控制能力增大约0.05 mm,且横向板厚分布的均匀性也有明显的改善。
In order to improve the control ability of the cooling system to the work roll temperature, a three-dimensional flow and heat coupling model between the work roll and the coolant liquid is established to study the influence of the cooling structure parameters and installation dimensions on the work roll cooling effect. Analysis of the nozzle tilt angle, the nozzle spacing and the injection angle of the coolant on the cooling effect. The results show that the convective heat transfer coefficient attenuates more in the single jet nozzle area than in the middle impact area, and the average convective heat transfer coefficient in the middle area is about four times that of the edge. On the basis of reducing the nozzle spacing properly, Adjusting the tilt angle of the nozzle makes it possible to cool the work rolls more evenly and with higher cooling efficiency. The verification by a two-roll reversible hot rolling mill shows that the improved cooling structure can increase the controllability of the center crown of the strip by about 0.05 mm, and the uniformity of the lateral thickness distribution has also been significantly improved.