A twin roll caster for aluminum alloy has several advantages, including rapid solidification, low equipment cost, and low running cost. In the twin roll caster of present study, attention was paid to the ability to attain rapid solidification. In casting, crystals of impurities can become fine, resulting in improvement of mechanical properties. Also, the casting process for recycled aluminum alloy must incur low running cost. The twin roll caster satisfies this requirement, and requires little space for installation and operation. However, the twin roll caster for aluminum alloy also has disadvantages, including low casting speed and limitations on alloys that can be cast. Use of a twin roll caster for recycled aluminum requires an increase in cooling rate and improvement of other disadvantages. In the present study, attempts were made to increase cooling rate and roll speed, and these efforts were successful. Effectiveness of a high-speed twin roll caster for recycling aluminum alloy was investigated. The effects of the high-speed twin roll caster on alleviating the deterioration of mechanical properties by impurities were investigated. Properties of the cast strip were investigated by metalography, a tension test, and a bending test.

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