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Abstract
In this paper, methods to evaluate optimality of a cooling pipe system in plastic injection moldings is presented. When plastic products are molded, residual stresses that cause warps and cracks in some years after molding are generated by a non-uniformity of temperature cooling rate in the die. The shape and layout design of cooling pipe system is the most effective factor for the improvement of distributions of coolant flow and temperature in the die. In this study, an optimum cooling pipe layout to give a uniform temperature distribution in the die is proposed to reduce the residual stresses. Then an optimization method is applied to design an optimal cooling pipe system, where the objective function consists of the plastic material temperature in the die calculated by a numerical simulation.
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