The gas-assisted injection molding (GAIM) process is so complicated that increasing reliance has been placed on CAE (Computer Aided Engineering) as a tool for both mold designers and process engineers. In this paper, a 3D theoretical model and numerical scheme is presented to simulate the GAIM process, in which an equal-order velocity-pressure formulation method is employed to eliminate the pressure oscillation. In addition, the whole flow field including the gas and melt regions is calculated using a uniform momentum equation with the viscosity of gas raised to a certain order of magnitude, and a 3D control volume scheme is employed to track the flow front of the melt and gas. Finally, the validity of the model has been tested through case studies and experimental verification.

中文翻译：

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基于3D模型的气体辅助注射成型有限元

气体辅助注射成型 (GAIM) 工艺非常复杂，以至于模具设计师和工艺工程师越来越依赖 CAE（计算机辅助工程）作为工具。在本文中，提出了一个 3D 理论模型和数值方案来模拟 GAIM 过程，其中采用等阶速度 - 压力公式方法来消除压力振荡。此外，包括气体和熔体区域的整个流场使用均匀动量方程计算，将气体的粘度提高到一定数量级，并采用 3D 控制体积方案来跟踪熔体和熔体的流动前沿。气体。最后，通过案例研究和实验验证验证了模型的有效性。