Processing Optimization of Plastics Injection Molding

摘要

Numerical simulation of injection mold filling process is combined with the design optimization method to find the optimum number of gates and their locations to achieve balanced flow and less weld lines while satisfying the limit of injection pressure in this paper. The objective function is expressed as the sum of the difference of the maximum and minimum times of boundary filling and a penalty item. The coordinates of gate locations are chosen as design variables. The constraint is to limit the inlet pressure to remain below reference value and side constraints limit the gate locations to a specified region of the mold A genetic method is implemented as the optimization algorithm. The number of gates is determined in the reanalysis of the filling process. Numerical examples are given to demonstrate the effect of optimization method.