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Three-dimensional numerical simulation for plastic injection-compression molding

Frontiers of Mechanical Engineering 2018年第1期13卷 74-84页

作者： Yun ZHANG Wenjie YU Junjie LIANG Jianlin LANG Dequn LI State Key Laboratory of Material Processing and Die & MoldTechnology Huazhong University of Science and Technology Wuhan430074 China Beijing Institute of Aeronautical Materials Beijing 100095 China

Compared with conventional injection mold- ing, injection-compression molding can mold optical parts with higher precision and lower flow residual stress. However, the melt flow process in a closed cavity becomes more complex because of the moving cavity boundary during compression and the nonlinear problems caused by non-Newtonian polymer melt. In this study, a 3D simulation method was developed for injection-compres- sion molding. In this method, arbitrary Lagrangian- Eulerian was introduced to model the moving-boundary flow problem in the compression stage. The non-New- tonian characteristics and compressibility of the polymer melt were considered. The melt flow and pressure distribution in the cavity were investigated by using the proposed simulation method and compared with those of injection molding. Results reveal that the fountain flow effect becomes significant when the cavity thickness increases during compression. The back flow also plays an important role in the flow pattem and redistribution of cavity pressure. The discrepancy in pressures at different points along the flow path is complicated rather than monotonically decreased in injection molding.

关键词： injection-compression molding simulation,injection molding melt flow cavity pressure

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