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提出了一种基于表面模型的气体辅助注射成型(GAIM)流动模拟方法.通过手工选择气道引导线与自动计算气道参数相结合的方法来生成气道网格,避免了中面模型所需的二次建模.将气体的穿透行为作为熔体充填区域的边界条件引入,采用与传统塑料注射成型类似的有限元/有限差分法与控制体积法(CV/FEM/FDM)搭配对塑料充填区域进行求解;采用匹配渐近展开法求解气体穿透界面.本方法的模拟计算结果与实验基本符合,与基于三维模型的模拟相比,具有很高的计算效率以及较好的精度和计算稳定性.
A gas-assisted injection molding (GAIM) flow simulation method based on surface model was proposed.The airway grid was generated by manual selection of airway guideline and automatic calculation of airway parameters, avoiding the need of middle model , The penetration behavior of gas is introduced as the boundary condition of the melt filling region. The traditional finite element method (FEM) / finite difference method and control volume method (CV / FEM / FDM) And the filling area is solved.The matching asymptotic expansion method is used to solve the gas penetration interface.The simulation results of this method are in good agreement with the experiments and have a higher computational efficiency and better accuracy and calculation than the simulation based on the 3D model stability.