論文
過共晶Al-25%Si合金の半凝固ダイカスト
2018 年 59 巻 693 号 p. 183-188
詳細
2018 年 59 巻 693 号 p. 183-188
In die casting, it has been shown that the hypereutectic Al-25%Si alloy has excellent fluidity. In this study we clarified that the semisolid Al-25%Si alloy showed better fluidity than did the molten-metal ADC12 alloy, which is a popular AlSi-Cu alloy for die casting. The result obtained suggests that Al-25%Si alloy is suitable for manufacturing thin die cast products. By using the Al-25%Si alloy, a heat sink model having fins with 50 mm height, thin tops 0.5 mm thick and a draft angle of 0.5°, could be successfully cast at a plunger speed 1.6 m･s-1. It was found that heat dispersion characteristics ware not influenced by the reduction in fin thickness. It is concluded that thinner fins manufactured using the semisolid Al-25%Si alloy are useful in reducing the production weight of the heat sink.
