JPS6138751A - Method for dissipating wave of pouring basin in continuous casting machine - Google Patents

Abstract

PURPOSE:To suppress the waving of a pouring basin and to produce a steel plate having good quality by applying horizontally a magnetic field to the surface of the surface of the pouring basin in a continuous casting machine and conducting electricity thereto in the horizontal direction and the direction intersecting orthogonally with the magnetic field. CONSTITUTION:This continuous casting machine produces the steel plate 5 by storing the molten steel 3 supplied from a nozzle 6 to form the pouring basin 8 above a pair of cooling rolls 1, 2 disposed to face each other apart at a prescribed spacing, rotating the rolls 1, 2 to move the solidified layer of the molten steel 3 formed atop the same and casting the steel plate. The magnetic field is formed forward and backward in the horizontal direction to the surface part of the above-mentioned pouring basin 8 by coils 7 provided before and behind the same and the electricity is conducted between a pair of electrodes 9 and 10 provided on the right and left in the direction intersecting orthogonally therewith to generate the electromagnetic force in the pouring basin 8 from above to below. The waving of the surface of the basin 8 is thus dissipated and the generation of defects such as double skins and cracks of the steel plate 5 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for dissipating water from a sump in a continuous casting machine.

[Conventional technology]

A continuous casting machine continuously casts a cast plate while appropriately pouring molten steel into a mold. When such a continuous casting machine pours molten steel into a mold, ripples occur on the surface of the molten metal pool. These ripples are undesirable because they cause defects such as double skin and cracks in the cast plate.

In conventional continuous casting machines, no particular measures have been taken against ripples on the surface of the tundish basin, and the above-mentioned defects may occur.

In addition, to prevent ripples on the surface of the hot water pool, it is possible to cover the surface of the hot water pool with a refractory material to eliminate the free surface, but this may lead to durability problems due to the refractory material being drawn into the mold or the hot water being hot. At the same time, there is also the problem that the refractory material cools the surface of the pool, causing a solidification phenomenon, making it impractical.

[Problem that the invention seeks to solve]

In view of the above-mentioned circumstances, the present invention provides a method for suppressing the ripples on the surface of the trough when poured into the mold of a continuous casting machine, and eliminates defects such as double skin and cracks in the cast plate caused by the ripples. It is intended to prevent

[Means for solving problems]

The present invention generates a horizontal magnetic field on the surface of the molten metal and energizes the surface in the horizontal direction and in a direction orthogonal to the magnetic field, thereby generating a downward magnetic force in the molten steel in the molten metal and suppressing ripples. It was made in a similar manner.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a first embodiment, in which the present invention is applied to a twin-roll continuous casting machine.

Cooling rolls (1) (2) arranged facing each other with a required gap
are rotated while being cooled, and above the cooling rolls (1) and (2) there is a weir (3) for storing molten steel (3).
4) is provided. When the cooling roll (IO2>) is rotated at a predetermined speed, the molten steel in contact with the cooling rolls (1) and (2) solidifies, and this solidified layer is formed on the cooling rolls (1) and (2).
As the steel rotates, it moves and grows, and is cast as a steel plate (5).

In such a continuous casting machine, a nozzle (6) is installed in the weir (4).
When more molten steel (3) is injected, ripples occur on the surface of the pool (8) as shown in the figure.

Coils (power) are arranged on the opposite side and the front side of the weir (4) with respect to the plane of the paper sandwiching the layer (4), and the coil (7) is energized in the counterclockwise direction. Electrodes f9) (1 (1) are immersed in the left and right sides of the near-surface diagram, and electricity is applied from the left side to the right side.

By doing the above, the current flows from the left side to the right side in the coil (the magnetic field is generated perpendicular to the plane of the paper and from the back side to the front side due to the force) and in the water pool (8), so the water pool In (8), electromagnetic force is generated from above to below (Fleming's left hand rule). Therefore, a restraining force acts on the ripples on the surface of the hot water pool.

By applying electricity as described above when pouring molten steel, ripples on the surface of the molten metal can be effectively dissipated.

Next, FIG. 2 shows a second embodiment, in which the present invention is applied to a deep groove type endless track type horizontal continuous casting machine.

In the one shown in Fig. 2, the endless track mold walls (1) are made by endlessly connecting mold pieces aυ, and the deep groove-shaped mold (1) faces each other.
+3) is formed, and molten steel (
3) is poured, the mold wall (121) is circulated, and a solidified shell is grown on the contact surface between the mold piece aυ and the molten steel.

Even in a continuous casting machine having this configuration, ripples occur on the surface of the molten metal pool when pouring the molten metal, similar to the embodiment described above.

A coil (force) is arranged on both sides of the mold 03) and on the downstream side of the nozzle (6), and the coil (7) is energized in the counterclockwise direction. Electrodes (9) QOI are immersed in the upstream and downstream positions, and electricity is applied from the upstream side to the downstream side.

As in the implementation side, electromagnetic force is generated downward in the hot water pool (8), producing a wave-dissipating effect.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to generate a wave-dissipating effect without any adverse effect on the molten steel in the pool, and it can be easily applied to existing ones, and the quality of the cast plate can be improved. Can be done.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the first embodiment, and FIG. 2 is an explanatory diagram of the second embodiment. (7) is a coil, (8) is a water reservoir, and (9) Ql is an electrode.

Claims (1)

[Claims] 1) A method for dissipating waves in a sump in a continuous casting machine, which comprises generating a horizontal magnetic field on the surface of the sump and energizing the surface in a horizontal direction and in a direction perpendicular to the magnetic field.