| 摘要 |
PURPOSE:To produce case pieces of high quality under stable conditions, by evacuating the system of tundish provided between the ladle and mode, and vacuum- treating the molten steel poured into the tundish from the ladle, and sucking with an electromagnetic pump to pour into the mold. CONSTITUTION:Bellows type joints 11 are provided between a ladle nozzle 8 and molten steel inlet 9, and between outlet 10 and upper end of mold 5, and a tundish 3 is kept in air-tight system, and is held in vacuum state by evacuating from an exhaust port 12. Molten steel 2 in a ladle 1 is poured into the tundish from the nozzle 8 at the specified flow rate, and is vacuum-treated herein. Parallel to this, the molten steel 2 is sucked up on the side wall by an electromagnetic pump 13, and is poured into the mold 5 from the outlet 10. Next, the molten steel 2 is cooled from outside, and a soldified shell 15 is formed, and cast pieces 6 are continuously drawn out from below. |
