基于气体穿透机理的研究分析,精确描述气辅成型中气体穿透推进过程,将三明治成型理论应用到气辅成型中。以矩形平板型腔为例,结合Hele-Shaw流动模型,引入合理简化和假设,建立气体辅助注射成型首次气体充填过程的压力控制方程和气/液交界面运动方程,并应用无网格Galerkin法做数值模拟。得到了不同时刻气体的穿透情况以及不同节点的压力随时间的变化曲线。数值表明:三明治成型理论应用于气辅成型所建的数学模型能准确反应气体穿透推进过程,无网格Galerkin法能较好的追踪气/液界面的动态演化过程。 Based on the research and analysis of gas penetration mechanism, the gas penetration and propulsion process in gas-assisted molding is described accurately and the sandwich forming theory is applied to gas-assisted molding. Taking the rectangular plate cavity as an example and combining the Hele-Shaw flow model, a reasonable simplification and hypothesis are introduced to establish the pressure control equation and the gas / liquid interface equation of the gas-assisted injection molding during the first gas filling process. The meshless Galerkin method Numerical Simulation. The penetration of gas at different times and the pressure curves of different nodes with time were obtained. The numerical results show that the mathematical model established by the sandwich forming theory can accurately reflect the gas penetration process. The meshless Galerkin method can better track the dynamic evolution of the gas / liquid interface.