| 摘要 |
This invention is intended to provide a twin-roll continuous casting method that that makes it possible to control occurrence of casting defects in the center part of plate thickness, for Al-Mg series aluminum alloy, a material featuring a wide temperature range for solid and liquid phases coexistence. In the above method of manufacturing Al-Mg series aluminum alloy cast plate 4, the plate contains Mg in a predetermined amount and has relatively thick plate size, while casting is performed by a twin-roll type continuous casting method. The twin rolls 1 and 2 have the roll diameter D (m), and the rolls have a circumferential velocity v (m/s). The circumferential length from the points 5 and 5 where molten metal starts contact with the rolls 1 and 2, to the kiss points 6 and 6 is called the solidification distance s (m), and the roll gap at the kiss points 6 and 6 is equal to the thickness of the cast plate d (m). There are made up specific relations among the above factors, and the continuous casting operation is carried out while satisfying such relations. |
