注塑制品微结构的三维数值模拟分析

构建带有圆柱阵列微结构的微注射制品3D模型，采用聚丙烯为原料，应用针对不可压缩性流体的三维有限元方法，根据优化的有限元网格实现体积控制来预测熔体的前沿流动。结果发现基于3D数值模拟方法很好的模拟出微注射制品不同填充阶段的流动状态、温度场和速度分布。厚度方向微结构的充填过程滞后于流动前沿径向的推进，因此不利于微结构区域气体的排出；微圆柱结构充填时具有喷泉状流动前沿。

Analysis for microstructure of micro columns arrays on micro-injection molding by three-dimensial numerical simulation

Micro injection molding is the most key technology in MEMS/NEMS industry for the necessary of scale. PP (polypropylene) microstructures of micro columns were investigated with a control volume scheme with a fixed finite element mesh to predict melt front advancement in micro injection molding process. The result show that the 3D numerical simulation can simulate very well for flow situation on micro-injection molding of microstructure. The melt front firstly slips across the thickness direction of columns array, and then fills into the microstructure. Fountain shape of flow front is set up when passes through the micro column.