Abstract
Cu-Be alloy, whose thermal conductivity is 3 to 10 times higher than the common mold steels, has been identified as an effective material for improving the cooling uniformity of resin when applied it to plastic injection molds as inserts. However, arranging an optimum shape and size of the Cu-Be alloy into a mold is still one of the major problems in using this technology. In this paper, an evaluation method of cooling uniformity to a resin product is proposed by observing the temperature distribution and its variation on the resin surface. This method can be used for judging the validity of a cooling system inside an injection mold, such as the layout of cooling channels, or the shape and the arranging location of a embedded Cu-Be alloy block. This can be realized by comparing the result values gained from a defined evaluation function. Simultaneously, by making the evaluation value to converge to the minimum, a procedure is provided for the automatic search of the Cu-Be black from an arbitrarily assigned initial arrangement to the optimum shape. Furthermore, case studies are presented to discuss the process of realizing the automatic shape generation of Cu-Be alloy inserts based on numerical analysis.
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