基于有限元法的布流器水口结构优化研究

Optimization on nozzle structure of delivery system based on FEM

为了研究布流器水口结构与铸轧工艺参数的取值这2个关键因素对薄带产品质量的影响,基于有限元分析软件,建立三维铸轧熔池流热耦合模型。布流器水口结构的部分参数通过正交试验的方法进行了优化,并分析了结构参数对熔池的影响。根据优化后的参数,重新建立模型,研究了铸轧工艺参数对熔池温度场的影响规律。结果表明,布流器侧面水口锥角的取值对熔池出口温度差值影响最大,端面水口倾角主要影响自由液面湍动能差,优化后的熔池模型自由液面湍动能以及熔池出口温度分布更加均匀;熔池出口温度与铸轧速度、过热度呈线性关系,从而得出过热度和铸轧速度的合理取值范围,这为实际生产过程提供理论依据。

In order to study influence of the two key factors of the nozzle structure of the delivery system and casting process parameters on the product quality,a three-dimensional casting and rolling pool flow-heat coupling model was established based on the finite element analysis software.The orthogonal experiments were used to optimize the nozzle structure parameters of the delivery system,and the influence of structural parameters on molten pool was analyzed.The model was re-established with the optimized parameters obtained,and the influence of casting process parameters on the temperature fields of the molten pool was studied.The results show that the taper angle of side nozzles has the greatest influence on the outlet temperature difference.The inclination of the nozzle at end face mainly affects the free surface kinetic energy.The distribution of free surface kinetic energy and outlet temperature of the optimized molten pool is more uniform.The outlet temperature of molten pool is linearly related to casting-rolling speed and superheat degree,the range of superheat degree and casting-rolling speed is obtained in reason,which provides a theoretical basis for the actual production process.