| 摘要 |
PURPOSE:To produce a continuously cast billet having fine crystalline grain and excellent surface characteristic by using copper alloy made continuous casting mold having inner layer of graphite sleeve at the time of continuous casting non-ferrous metal and electromagnetic-stirring the molten metal in the mold under specific condition. CONSTITUTION:As the mold for continuous casting using at the time of continuous casting non-ferrous metal, such as Al, etc., copper alloy-made mold 3 having 5-15mm thickness of graphite-made sleeve 4 at the inner face thereof and 30-70% IACS electric conductivity for 5-15mm thickness is used and water- cooling jacket 2 is fitted at the outer circumference and also a liner motor 1 is arranged at both side part of water-cooling jacket 2. By generating magnetic flux having 1-20Hz frequency (f) and 0-1,500 gause magnetic flux density B and molten Al 7 in the mold on the surface of graphite sleeve 4 in the copper mold 3 by the liner motor 1 through the water jacket 2 is electromagnetic-stirred in the range of (B<2>f)<1/2>=300-3,000, to continuously cast. Continuously cast Al billet 8 having fine crystalline grain, excellent workability and good surface characteristic is produced. |
