Application method of tundish for vacuum ingot casting

[0017] refer to figure 1 , 2 , 3, 4;

[0018] figure 2 The relative positional relationship of the steel discharge port 7 of the inner and outer slag retaining weirs, the inner steel passage 51 and the outer steel passage 61 is shown.

[0019] Before pouring the molten steel, the stopper device 3 is lowered to block the nozzle 2, the gate 71 is lowered, and the steel discharge port 7 is blocked; steel is poured, and the molten steel enters the tundish outer chamber 11 through the steel pouring inlet 4, the pouring channel 41 and the steel discharge channel 42, The molten steel gradually rises in the outer cavity 11 of the tundish, and the upward flow field causes the slag to float up; when the liquid steel level rises to the lower 1/2 height of the outer steel passage 61, the gate 71 is lifted to open the slag retaining weir 6 of the outer layer. The steel discharge port 7, the molten steel enters the middle cavity 12 of the tundish through the steel discharge port 7 at the bottom of the outer layer slag retaining weir 6, and the liquid steel level in the outer cavity 11 of the tundish rises slowly. The liquid steel level and the liquid steel level in the middle cavity 12 of the tundish reach the outer steel passage 61 at the same time, ensuring that the liquid steel levels in the outer cavity 11 of the tundish and the middle cavity 12 of the tundish always maintain a rising flow field; when the middle of the tundish When the molten steel level in the chamber 12 reaches the lower 2/3 height of the inner steel passageway 51, lift the gate 71 of the slag retaining weir 5 on the inner layer and open the steel discharge port 7. On the one hand, the molten steel passes through the steel discharge port at the bottom of the square slag retaining weir 8 7 enters the nozzle 2, on the one hand, the liquid steel level in the middle cavity 12 of the tundish and the liquid steel level in the inner cavity 13 of the tundish continue to rise and reach the inner steel passage 51 at the same time, ensuring that the middle cavity 12 of the tundish and the outer cavity of the tundish The liquid steel level at 11 always maintains a rising flow field; when the liquid steel level in the tundish inner cavity 13 reaches the inner steel passage 51, the stopper device 3 is lifted to open the nozzle 2; the rate of pouring steel is controlled, and the molten steel passes through the opening 9 and The steel discharge port 7 of the square slag retaining weir 8 enters the water port 2 .

[0020] When the molten steel in the inner chamber 13 of the tundish approaches the opening 9, the stopper device 3 is lowered to block the opening 9, and the molten steel enters the nozzle 2 only through the steel discharge port 7 at the bottom of the square slag retaining weir 8 .