射出成形流動シミュレーターを用いたランナー最適設計―ウェルドライン発生位置の制御―
Optimization of Runner Design Using Injection-Molding Flow Simulator−Control of Position of Weld-Line−
安武健司・横山敦士・_田泰以
Yasutake, Kenji / Yokoyama, Atsushi / Hamada, Hiroyuki
This paper is concerned with the optimization of runner design using an injection-molding flow simulation and a mathematical programming method. A rectangular flat cavity with two gates was considered with a design objective to control the position of the weld-line in the cavity by adjusting the diameter of runners.
The optimal diameter of the runners was inversely determined so that the weld-line will appear at a target position on the mold. The optimal solution was obtained by iterating the injection-molding flow simulation and an optimization procedure.
Since the position of weld-line estimated by the injection-molding flow simulator was a discrete value, and the objective function for the problem became a step-like function, it was shown that the conventional optimization procedure might fail to obtain the optimal result for some initial values. An improved optimization algorithm was therefore proposed to obtain optimal solutions for any initial values.
Key words: Injection-molding flow simulation / CAE (simulation) / Optimization / Inverse problem / Runner design / Weld-line / Mathematical programming