铸铜冷却壁充型过程数值模拟

Numerical Simulation of Filling Process in Copper Stave Casting

利用有限元软件ANSYS模拟了金属型-砂型复合铸造工艺条件下,入口速度和浇注温度对紫铜冷却壁铸件充型过程流场的影响。结果表明,较小的入口速度(0.3和0.8m/s)会导致充型速度曲线上出现较大扰动。而当入口速度达到1.0m/s时,充型速度曲线无扰动,充型过程平稳,可作为生产中的浇注工艺参数参考值。采用变粘度模型研究了浇注温度对充型速度的影响。结果表明,提高浇注温度,液态金属的充型速度明显增加,有利于获得较大的速度梯度。

Influence of inlet velocity and pouring temperature of the metal melt on flow field in the copper stave in metal-sand molds was simulated using a finite element software ANSYS. The results reveal that obvious disturbance on the curves of filling velocities can be observed in condition of lower inlet velocities,such as 0.3 m/s and 0.8m/s,while absence of disturbance on the filling velocity curves can be observed with inlet velocity of 1.0 m/s,exhibiting smooth filling process,which can be used for the recommended value of pouring parameters during practical production. Varied-viscosity was adopted in the numerical simulation to predict the effects of pouring temperature on filling velocities. It is found that with increasing in pouring temperature,the filling velocity of metal melt is obviously accelerated,which is beneficial for obtaining larger velocity gradient.