JPH05277662A - Twin roll type clad steel sheet continuous casting apparatus - Google Patents

Abstract

PURPOSE:To provide a continuous casting apparatus capable of efficiently separating an upper and lower layer molten metal in a molten metal pool for a twin roll type clad steel sheet casting apparatus. CONSTITUTION:The two pouring nozzles 4a, 4b which pour different kinds of molten metals, are dipped into the molten metal pool 3 formed by the two rolls 1 and the side weir 2, the magnetic pole 5a forming the static magnetic field zone 6 is arranged outside the both end surface of the roll to constitute a magnetic circuit in contact with the roll shaft part 1c through a yoke of the magnetic pole. Accordingly, the yoke of the magnetic pole contacts with the roll shaft part to reduce a steel stock of the yoke part, the magnetic resistance is reduced to improve the magnet efficiency, leading to size and cost reduction of the apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting apparatus for producing a clad steel plate by compounding different kinds of molten metals by twin roll type continuous casting for producing a thin plate slab.

[0002]

2. Description of the Related Art As a technique for directly producing a multi-layer metal material having a predetermined plate thickness, that is, a clad steel plate by a twin roll type continuous casting machine, for example, two rolls and side weirs provided on both side surfaces of the rolls are used. Two pouring nozzles having different lengths are immersed in the molten metal pool portion, and different kinds of molten metals are poured into the pouring nozzles to form upper and lower two molten metal layers in the molten metal pool portion.

A technique for producing a clad steel sheet by forming an outer layer solidified shell by the upper layer molten metal in contact with the roll, subsequently forming an inner layer solidified shell by the lower layer molten metal, and integrally compounding the inner layer and outer layer solidified shells. There is.

By the way, according to this technique, different kinds of molten metals may coexist in the basin and two kinds of molten metals may be mixed. Therefore, in order to avoid this mixing, the molten metal forming the upper layer, that is, the molten metal forming the outer layer solidified shell must have a lower density than the molten metal in the lower layer forming the inner layer solidified shell.

Therefore, this method cannot be applied to the production of a clad steel sheet using a material having a higher density in the outer layer than in the inner layer, for example, a clad steel sheet in which the inner layer is a normal mild steel material and the outer layer is a stainless steel material. ..

Therefore, in order to avoid this mixing, for example, a static magnetic field band is provided in the transverse direction between the upper and lower molten metals to form a boundary layer of the molten metal by the static magnetic field band, and the static magnetic field band is formed above and below the static magnetic field band. It is known that the molten metal is subjected to a flow braking force (electromagnetic brake) to suppress mixing.

As an apparatus for forming a static magnetic field band in the molten metal pool, for example, a twin roll type continuous casting apparatus shown in FIGS. 4 to 6 is considered.

In this apparatus, two pouring nozzles 14a, 14 having different lengths are provided in a pool 13 formed by two rolls 11 and side dams 12 provided on both sides of the rolls.
A static magnetic field band 16 is formed by immersing b and further arranging an electromagnet 15 on the side surface of the side weir 12 to horizontally traverse the inside of the basin 13.
To form.

The electromagnet 15 has magnetic poles 15a of different polarities each having a coil 15b wound around the outer surface of the side dam 12, and is connected by a high-permeability yoke 15c surrounding the roll 11. It

In this way, the two injection nozzles 14a,
The molten metal injected from 14b forms the molten metal layer 13a in the upper layer and the molten metal layer 13b in the lower layer.

The molten metal of the molten metal layers 13a and 13b formed in the upper and lower layers of the static magnetic field zone 16 is subjected to a flow braking force by the static magnetic field zone 16 and is separated into upper and lower parts in the pool 13 for mixing. There is nothing to do.

The upper layer molten metal is cooled by the roll 11 to form the outer layer solidified shell 17a, and the lower layer molten metal forms the inner layer solidified shell 17b inside the outer layer solidified shell 17a. Then, the solidified shells 17a and 17b of the inner and outer layers are integrally compounded to form a multi-layer cast piece 18, and a clad steel plate is manufactured.

[0013]

By the way, the electromagnet 15 forming the static magnetic field band 16 is connected by the yoke 15c surrounding the roll 11, so that the electromagnet structure becomes large and the weight of the apparatus becomes large. At the same time, the magnetic resistance becomes large and the efficiency is not good.

The present invention has been made in view of the above problems,
(EN) A twin-roll type continuous casting apparatus, which provides a continuous casting apparatus for a clad steel plate that efficiently separates the upper and lower molten metal in the pool.

[0015]

According to the present invention, two pouring nozzles having different lengths are immersed in a molten metal pool portion formed by two rolls and side dams provided on both side surfaces of the rolls, and the pouring is performed. In a twin-roll type clad steel plate continuous casting apparatus for manufacturing a clad steel plate by injecting different kinds of molten metals into a nozzle, magnetic poles for forming a static magnetic field band of the molten metal pool are arranged on both side surfaces of the roll, Is a twin roll-type clad steel plate continuous casting device, characterized in that a magnetic circuit is formed by joining the steel sheet with a roll shaft portion via a yoke.

[0016]

[Function] By applying a static magnetic field band in the molten metal in the transverse direction, the static magnetic field band forms a boundary layer of the molten metal,
It is well known that the molten metal above and below the static magnetic field zone is subjected to a flow braking force (electromagnetic brake) to suppress mixing.

The present invention relates to a continuous casting apparatus for twin-roll thin plate slabs known as the Bessemer method.
For example, an electromagnet is arranged on each roll and side weirs provided on both side surfaces of the roll, and a static magnetic field band that horizontally traverses the inside of the basin is formed by the electromagnet, and the magnetic pole of the electromagnet is rolled by a roll shaft portion. It is a twin-roll type clad steel plate continuous casting device that is joined to a magnetic circuit.

The surface of the roll of the twin roll type continuous casting apparatus is a sleeve of Ni-plated copper or SUS material, the cooling pipe is arranged on the inner surface side thereof, and the shaft portion usually has a high magnetic permeability. It is made of steel.

According to the present invention, the shaft portion is used as a yoke of an electromagnet that forms a static magnetic field band, so that the steel material of the yoke portion conventionally arranged around the roll is significantly reduced, and further, The magnetic circuit is shortened, the magnetic resistance is reduced, and the efficiency of the electromagnet is improved.

By thus forming the static magnetic field band between the molten metal layers, the molten metals do not mix even if the molten metals having different densities are injected into the upper and lower layers, and the produced clad steel sheet is Since the molten metal does not mix, the boundary between the outer layer and the inner layer becomes a slab with a very clear boundary, and an excellent clad steel plate can be obtained.

[0021]

1 to 3 are drawings showing an embodiment of the present invention, FIG. 1 is a side view, FIG. 2 is a plan view, and FIG. 3 is a front view.

In this continuous casting apparatus, two pouring nozzles 4a, 4b having different lengths are immersed in a molten metal pool 3 formed by two rolls 1 and side dams 2 provided on both sides of the rolls. Then, different types of molten metal are injected from both nozzles to form the upper and lower two molten metal layers 3a and 3b in the basin 3.

In this apparatus, an electromagnet 5 is arranged on the side surface of each side weir 2 to form a static magnetic field band 6 which horizontally traverses the inside of the pool 3 and is immersed in the upper layer of the above two injection nozzles. The molten metal injected from the short injection nozzle 4a to be formed forms the molten metal layer 3a, and the molten metal injected from the long injection nozzle 4b immersed in the lower layer forms the molten metal layer 3b.

The surface of the roll 1 is a Ni-plated copper or SUS material sleeve 1a, a cooling pipe 1b is arranged on the inner surface side thereof, and a shaft portion 1c is made of high-permeability steel. ing.

The electromagnet 5 is provided with magnetic poles 5a of different polarities, each having a coil 5b wound around the outer surface of the side dam 2, and the magnetic poles 5a are joined to the roll shaft portion 1c via yokes to form a magnetic circuit. Is configured.

The molten metal of the molten metal layers 3a and 3b formed in the upper and lower layers of the static magnetic field zone 6 is subjected to a flow braking force by the static magnetic field zone 6 and is separated into upper and lower parts in the pool 3 for mixing. There is nothing to do.

In this way, the two injection nozzles 4a, 4a
The molten metal injected from b causes the molten metal layer 3 to form an upper layer.
a is formed, and a molten metal layer 3b is formed as a lower layer.

Here, the molten metal in the upper layer is cooled by the roll 1 to form the outer layer solidified shell 7a, and the molten metal in the lower layer is inside the outer layer solidified shell 7a.
b is formed. Then, the solidified shells 7a, 7 of the inner and outer layers
b is integrally compounded into a multi-layer cast slab 8 to manufacture a clad steel plate.

In the above embodiment, the electromagnet 6 is used as a means for forming the static magnetic field band 6 by arranging the magnetic poles 5a, but a permanent magnet may be used instead of the electromagnet to form the static magnetic field band. ..

By using the roll shaft portion as a yoke of an electromagnet that forms a static magnetic field band in this way, the steel material of the yoke portion conventionally arranged around the roll is significantly reduced, and further, the magnetic material is reduced. The circuit becomes shorter and the magnetic resistance becomes smaller, so that the efficiency of the electromagnet can be improved.

By forming a static magnetic field band that horizontally traverses the inside of the basin in this way, it is possible to prevent the molten metal in the upper and lower layers from being mixed with each other and form a slab with an extremely clear boundary between the outer layer and the inner layer. A clad steel sheet is obtained, and even if molten metals with different densities are injected into the upper and lower layers, the two molten metals do not mix, and the upper layer or outer layer has a higher density than the lower layer or inner layer. It is possible to manufacture.

[0032]

As described above, according to the present invention, the yoke of the magnetic pole for forming the static magnetic field band in the pool is joined to the shaft of the roll so that the roll is conventionally surrounded. It is possible to significantly reduce the steel material of the yoke part, further shorten the magnetic circuit, reduce the magnetic resistance and improve the efficiency of the electromagnet, and reduce the size of the device and gradually reduce the equipment cost. obtain.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a twin roll type clad steel plate continuous casting apparatus.

FIG. 2 is a plan view of FIG.

FIG. 3 is a front view of FIG.

FIG. 4 is a side view showing a comparative example of a twin roll type clad steel plate continuous casting apparatus.

FIG. 5 is a plan view of FIG.

FIG. 6 is a front view of FIG.

[Explanation of symbols]

 1, 11 Rolls for casting 1a Sleeve 1b Cooling pipe 1c Shaft part 2, 12 Side weir 3, 13 Hot water pool part 3a, 13a Upper molten metal layer 3b, 13b Lower molten metal layer 4a, 14a Injection nozzle 4b for upper layer, 14b Injection nozzle for lower layer 5, 15 Electromagnet 5a, 15a Magnetic pole 5b, 15b Coil 5c, 15c Yoke 6, 16 Static magnetic field band 7a, 17a Outer layer solidified shell 7b, 17b Inner layer solidified shell 8, 18 Multilayer cast piece

Claims (1)

[Claims] 1. A basin formed by two rolls and side weirs provided on both sides of the rolls has different lengths.
In a twin roll type clad steel plate continuous casting apparatus for manufacturing a clad steel plate by immersing a book injection nozzle and injecting different kinds of molten metals into the injection nozzle, on both side surfaces of the roll,
A twin-roll type clad steel plate continuous casting apparatus, characterized in that a magnetic pole for forming a static magnetic field band of a basin is arranged, and the magnetic pole is joined to a roll shaft through a yoke to form a magnetic circuit.