注塑成型中,熔体在模腔内的流动为非牛顿流体在复杂型腔内的非等温、非稳态流动。充填过程的三维数值模拟能更真实地模拟熔体在型腔内的三维流动状态。本文采用有限元分析软件ANSYS CFX进行二次开发,实现注塑成型充填过程的三维模拟,可求解熔体前沿、压力场、温度场等一系列模拟结果。模拟结果与注塑成型软件MOLDFLOW结果进行对比,验证了该方法的有效性。算例分析结果表明,对于薄壁制品,基于中面模型的注塑成型模拟方法是适用的,但对于非薄壁制品,采用三维模拟方法可以得到更合理更全面的信息。
In injection molding, the non-Newtonian viselastic fluid flows in complex cavity under non-isothermal condition, 3D simulation can describe the flow behavior of the polymer melt accurately, ANSYS CFX was adopted to implement the 3D filling simulation of injection molding, and the melt front, pressure and temperature fields during injection molding were simulated. The simulation results were verified by comparing the results of MOLDFLOW and ANSYS CFX. The analysis of simulation results indicates that Hele-shaw flow is suitable for simulating the thin-wall part, but the 3D model can describe the flow phenomena for the thick wall part.
参考文献
| [1] | 王利霞,申长雨,陈静波,刘春太,董斌斌.注塑成型充模过程的温度场计算[J].计算力学学报,2002(02):173-178,187. |
| [2] | Huamin Zhou;Dequn Li .A Numerical Simulation of the Filling Stage in Injection Molding Based on a Surface Model[J].Advances in Polymer Technology,2001(2):125-131. |
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