銅ロール用いた縦型双ロールキャスターによるアルミニウム合金A6061の薄板作製条件の検討

抄録

This paper reports on the vertical twin roll casting of aluminum alloy A6061. Generally, thin aluminum sheet fabrication involves multiple processes and is expensive. In this paper, we investigate the conditions under which thin aluminum alloy A6061 sheets can be fabricated by the twin roll casting method, which can directly fabricate thin sheets from molten metal. The effects of roll speed on sheet continuity, surface properties, and thickness were investigated, and the characteristics of twin-roll casting were evaluated by observing the microstructure of the sheets and conducting Vickers hardness tests. The experimental apparatus was newly designed and fabricated to study continuous casting of thin sheets under low-speed and high-pressure conditions. The roll material is CCM-A, a copper alloy. Experiments were conducted under three conditions of roll peripheral speeds of 3, 5, 7, 10, and 12 m/min, and thin sheets could be produced under all conditions. The surface of the fabricated sheets consisted of metallic luster and cloudy areas, and fine solidification cracks were observed in some places.