ヒートシンク用プレートフィン付き平板状アルミニウム鋳物の凝固特性

抄録

  The effects of plate-fins added to plate-shaped aluminum casting on the directional solidification characteristics were numerically examined by heat transfer and solidification simulation, and concepts for the casting designs of aluminum heat sink were also investigated. In the end effects E/T (E : end-effective range, T : baseplate thickness) of plate-casting with added fins, there were differences depending on casting and mold materials or fin-adding conditions. Meanwhile there were cases where solidification of the baseplate finished before that of the fins under the fin-adding conditions with greater end effects. Here it is considered that the conditions with the sequence of these solidification processes may be unsuitable for manufacture by casting. These differences in both the end effects and solidification process, depending on fin-adding conditions, could be explained by considering equivalent thickness including fins. In addition, it was suggested that the fin-adding conditions with smaller equivalent thickness than the baseplate thickness especially have the potential to provide greater end effects by increasing the initial mold temperature. Furthermore, it was suggested that the plot of heat-exchanging performance versus the end effects in aluminum heat sink may be useful for the casting design.