注塑成型流动保压与冷却过程的耦合分析

HYBRID SIMULATION OF FILLINGPACKING AND COOLING IN INJECTION MOLDING

本文对塑料熔体在注塑成型的流动、保压及冷却过程中的流变行为和热平衡进行了综合分析，在此基础上，运用有限元／有限差分混合数值方法求解流动保压阶段的速度场、压力场及温度场，通过边界元法分析冷却过程中制品与模腔的稳态及瞬态温度场。由于采用了统一的三角单元网络，在采用分时迭代求解的控制策略中，可以利用各单元结点的温度，实现上述三种数值方法的耦合计算。

Based on the characteristic of viscous plastic melt and thermal equivalence in the processes of filling,packing and cooling in injection mold,a hybrid numerical scheme is developed.On the one hand,finite element method and finite difference method are used to analyze the vilocity,pressure and temperature fields in the filling and packing stage. On the other hand,the termperature field of part and cavities in the processes of cooling is solved by boundary element method. Triangular elements are kept consistent and the temperature in each mode can be transfered in those stages. Consequently the hybrid simulation of different numerical methds is realized by the stratage of iteration on the basis of dividing time.