熔体注射次序对水辅共注成型工艺的影响

摘要

基于有限体积法和流体体积法，在 OpenFOAM开源平台上编制了互不相溶粘弹多相流的新求解器，将之用于溢流法水辅共注填充过程的数值模拟中。针对皮层、内层熔体注射次序这一重要的工艺条件，进行了系统的数值分析，得出了结论：由于皮层、内层熔体零剪切粘度中弹性分量的不同，两熔体层的注射次序对水辅共注成型制件产生巨大影响，不恰当的两熔体层注射次序会导致制件被穿透而导致成型失败。最后进行了水辅共注成型的实验进行验证，得到的结论与数值模拟所得的结论保持了一致。%Based on the finite volume method and the volume of fluid method, a new solver was built on the open source platform named OpenFOAM for the flow problems of viscoelastic fluids which repel each other.The solver can simulate the overflow water-assisted co-inj ection molding filling process.This paper systematically analyzed the influ-ence of skin and inner melt inj ection order.The results showed the melt inj ection order have a giant effect on the prod-uct because of elastic component in zero shear viscosity of melts, a wrong melt inj ection order can lead to fail of mold-ing because of being penetrated.Finally, the experiments of overflow water-assisted co-inj ection were carried out and the conclusion of numerical simulation has been verified.