3102 プラスチック射出成形金型の冷却管最適配置設計 : 冷却管の断面形状を考慮した冷却管配置設計

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This paper proposes an optimum design method of cooling channel layout in a plastic injection molding die based on the evaluation of warpage to produce precise plastic products and molding cycle time to improve productivity. The numerical simulations, such as injection process, cooling process and ejection process, are implemented to calculate the warpage induced by residual stress and the molding cycle time. A multi-objective optimum design problem is formulated to achieve the warpage reduction and the short molding cycle time, simultaneously. In this formulation, the warpage and the molding cycle time are adopted as objective functions, and the cooling channel arrangement as design variables. The basis vector method is used to change the cooling channel arrangement. The response surface method is applied to reduce the number of numerical simulations in the optimization process. Through two-dimensional numerical examples, it is found the availability of the optimum design method by discussing on the effect of the cross sectional shape of cooling channel for the minimization of warpage.
2008-09-26