抄録
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 stresses 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. Through two-dimensional numerical example, we discuss about the effect of the arrangement and the cross sectional shape of cooling channel for the minimization of warpage and molding cycle time.
