AUTOMATIC CONTROLLING METHOD FOR MOLTEN METAL LEVEL IN MOLD OF CONTINUOUS CASTING MACHINE

摘要

PURPOSE:To extend the service life of an immersion nozzle and to reduce the consumption of refractories by changing continuously the level of the boundary surface between the powder and molten metal in a mold by pattern control. CONSTITUTION:The level of the boundary surface 7 between the molten meal 4 and the power 6 is controlled in accordance with the prescribed pattern and is continuously changed. A hydraulic apparatus or electric apparatus 12 is controlled by the output signal from an electronic computer 11 and the opening degree of a stopper or sliding nozzle is gradually decreased so that the level of the boundary surface 7 is decreased with lapse of time. The opening degree of the stopper or the sliding nozzle is detected with an opening degree meter 13 and is fed back to the computer 11. The apparatus 14 is controlled to increase gradually and continuously the revolution of a drawing roll 10 and to lower the level of the boundary surface 7 with lapse of time if the opening degree of the immersion nozzle is constant. The quality of the solidified metal is improved by such pattern control.