注射模浇口数目和位置的优化设计

DESIGN OPTIMIZATION OF LOCATION AND NUMBER OF INJECTION MOLD GATES

给出一种注塑模具浇口位置和数目的优化设计方法 .为达到减少塑件翘曲变形和熔接线的目的 ,以平衡充填和浇口数目最少为优化目标 ,以最大注射压力为约束条件 ,将浇口位置坐标作为设计变量 ,并根据浇口位置在充填数值模拟中对浇口数目和注射流率进行处理 ,从而可以同时优化浇口数目及其位置 ,优化求解采用遗传算法 .算例表明 。

A design optimization scheme is proposed to optimize both the number and locations of the gates by analyzing the filling process. In order to reduce the part warpage and weld line, 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. The objective function is expressed as the sum of the differences 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 to limit the gate locations to a specified region of the mold. The number of gates is determined in the re-analysis of the filling process. A genetic method is implemented as the optimization algorithm. Numerical examples are given to demonstrate the effect of optimization method.