JPH06182502A - Single gelt type band metal continuous casting apparatus - Google Patents

Abstract

PURPOSE:To prevent waving of a molten metal pool part and to obtain a band metal having flattened surface without ruggedness by arranging an electromagnetic brake above a molten metal pool at the drawing side of the band metal rather than a molten metal pouring of point on a belt. CONSTITUTION:At the time of pouring the molten metal 7 onto the metallic belt 1 from a tundish 6, waving is generated by pouring flow of the molten metal 7 on the surface of the molten metal pool 8, but in order to eliminate this waving, the electromagnetic brake 15 is arranged above the molten metal pool 8 at the drawing side of the band metal 9 rather than the the molten metal pouring point. By this device, the waving is eliminated in the band metal 9 direction from the electromagnetic brake 15 and the flattened molten metal pool is formed. Therefore, since the solidified shell 13 is formed in the condition having no waving on the molten metal pool 8, the flattened surface shape without the ruggedness is formed on the surface of the solidified shell 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-belt type continuous metal band casting apparatus for obtaining a high-quality metal band having an excellent surface shape.

[0002]

2. Description of the Related Art FIG. 2 is an explanatory view of an example of a single belt type continuous casting machine for metal strips. The metal belt 1 runs endlessly between the rotating pulleys 2a and 2b.

Two side dams 4a and 4b are arranged on the metal belt 1 with a gap therebetween, and the side dams 4a and 4b run in the same direction as the metal belt 1 at the same speed.

Reference numeral 5 denotes a rear weir, which includes the metal belt 1 and the side weirs 4a.
Unlike 4b, it is provided at a fixed position on the metal belt 1 without traveling.

When the molten metal 7 is poured into the space formed by the metal belt 1, the side weirs 4a and 4b, and the rear weir 5, a basin 8 is formed.

The molten metal in the pool 8 is cooled by the metal belt 1 and forms a solidified shell on the metal belt 1. The solidified shell runs following the metal belt 1 and the metal strip 9
Will be taken out.

The metal strip 9 taken out is wound into a coil by, for example, a pinch roll 10 and a coiler 11.
In the figure, 6 is a tundish containing molten metal, and 3 is a cooling device for cooling the metal belt from the back side.

By using this metal strip continuous casting apparatus, a metal strip having an arbitrary thickness can be produced with high efficiency.

The molten metal in the pool 8 is the metal belt 1
The solidified shell is cooled on the metal belt 1 to form a solidified shell. This process will be described in detail with reference to FIG.

That is, the tundish 6 to the metal belt 1
The molten metal 7 injected above forms a pool 8, and the molten metal in the pool 8 is cooled by the metal belt 1.
At the same time that the solidified shell 14 is formed thereon, the surface of the pool 8 is also cooled by the atmosphere to form the solidified shell 13.
The solidified shells 13 and 14 follow the metal belt 1 while traveling and become integrated, and are taken out as a metal band 9.

However, when the molten metal 7 is poured from the tundish 6 onto the metal belt 1, the surface of the pool 8 is wavy due to the pouring flow of the molten metal 7.

Therefore, the solidified shell 13 is formed in a state where the molten metal pool 8 is wavy, so that unevenness is formed on the surface of the solidified shell 13 and a slab having an excellent surface shape cannot be obtained. .

Japanese Unexamined Patent Publication (Kokai) No. 61-78538 discloses a method in which a porous refractory material is provided at the molten metal pouring outlet of a tundish, and the molten metal is passed through the porous refractory material and poured into a pool. There is.

The object of this purpose is to deteriorate the surface properties of the cast product due to the remelting of the solidified shell at the downflow point of the molten steel due to the molten steel injection flow from the tundish, and further to inject the molten metal into the molten metal during injection. It is to provide an effective means for removing non-metallic inclusions contained therein.A porous refractory material is provided at the molten metal pouring outlet of the tundish, and the molten metal is passed through the porous refractory material and poured into the pool. How to do
It also helps to make the molten steel injection flow from the tundish uniform and to prevent the waviness of the molten metal pool, which is the object of the present invention, but it is not enough to eliminate the waviness.

Alternatively, in Japanese Patent Laid-Open No. 3-243251, six or more pouring holes having a diameter of 8 mm or more are formed in the molten metal pouring portion of the tundish, and the pouring hole outlet and the molten metal surface of the pouring portion are formed. Disclosed is a continuous casting method characterized in that the straight line distance is 800 mm or less and the superheat degree of the molten metal in the pouring device is kept at 30 ° C. or less. If the diameter of the molten metal is decreased to increase the number of holes or the linear distance is set to 800 mm or less, the kinetic energy at the time of falling the molten metal increases and the thermal shock at the falling point becomes large. This is to prevent the solidified shell formed on the upstream side in the casting direction from the dropping point from being redissolved, resulting in a large variation in the thickness of the thin plate.

This reference is also useful for the purpose of the present invention to prevent the waviness of the pool, but it is not enough to eliminate the waviness.

The solidified shell in the above-mentioned references refers to the solidified shell 14 described in the present invention, not the solidified shell 13 which directly affects the formation of the metal band surface shape.

As described above, in any case, it is not possible to completely prevent the surface of the molten metal pool from waviness and to obtain a smooth metal strip having no irregularities in the surface shape of the metal strip.

[0019]

SUMMARY OF THE INVENTION The present invention, in a single belt type continuous casting apparatus for casting a metal strip by injecting molten metal onto the above-mentioned endless belt, causes ripples in the pool of water caused by the injection flow. It is an object of the present invention to provide an apparatus for manufacturing a metal strip that has a smooth surface shape without any irregularities.

[0020]

SUMMARY OF THE INVENTION The gist of the present invention is to cast a metal strip by injecting molten metal onto a belt that moves upward or inclined to form a pool. In a single-belt type metal strip continuous casting apparatus, an electromagnetic brake is arranged on the molten metal pool on the metal band drawer side of the molten metal pouring port for pouring the molten metal on the belt. It is a casting machine.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a single-belt type metal strip continuous casting apparatus of the present invention, which is an enlarged view of the vicinity of a molten pool on a belt.

The metal belt 1 has a rotating pulley 2a,
The vehicle runs endlessly between 2b (see FIG. 2).

Two side dams 4a and 4b (see FIG. 2) are arranged on the metal belt 1 with a gap therebetween.
Runs in the same direction as the metal belt 1 at the same speed.

Reference numeral 5 is a rear weir, which includes the metal belt 1 and the side weirs 4a,
Unlike 4b, it is provided at a fixed position on the metal belt 1 without traveling.

When the molten metal 7 is poured into the space formed by the metal belt 1, the side weirs 4a and 4b, and the rear weir 5, a basin 8 is formed.

The molten metal in the pool 8 is cooled by the metal belt 1 to form a solidified shell on the metal belt 1. The solidified shell runs following the metal belt 1 and the metal strip 9
Will be taken out.

Here, when the molten metal 7 is poured from the tundish 6 onto the metal belt 1, the surface of the pool 8 is wavy due to the pouring flow of the molten metal 7, but the metal strip 9 is pulled out from the molten metal pouring outlet. Electromagnetic brake 1 on the side melt pool 8
By providing 5, the ripples are eliminated from the electromagnetic brake 15 in the direction of the metal strip 9, and as a result, a smooth molten metal pool is formed.

Therefore, the solidified shell 13 is formed in a state where the molten metal pool 8 is not wavy, so that the surface of the solidified shell 13 has a smooth surface shape without irregularities.

The solidification shell 13 is integrated with the solidification shell 14 formed on the metal belt 1 while running along with the metal belt 1 and taken out as a metal strip 9.

[0030]

EFFECT OF THE INVENTION By using the single belt type continuous casting apparatus for metal strips of the present invention, a smooth metal strip having no unevenness on the surface of the metal strip can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view of a continuous casting device for metal strips according to the present invention.

FIG. 2 is an explanatory view of an example of a single-belt type metal strip continuous casting machine.

FIG. 3 is an explanatory diagram of generation of irregularities on a surface of a slab of a single belt type continuous metal strip casting machine.

[Explanation of symbols]

 1 Metal Belt 2a Pulley 2b Pulley 3 Cooling Device 4a Side Wall 4b Side Wall 5 Rear Weir 6 Tundish 7 Molten Metal 8 Hot Water Pool 9 Metal Band 10 Pinch Roll 11 Coiler 13 Solidified Shell 14 Solidified Shell 15 Electromagnetic Brake

Claims (1)

[Claims] 1. A single-belt type metal strip continuous casting apparatus for casting a metal strip by injecting molten metal onto a belt which is inclined upwards or moves horizontally to form a pool of molten metal, and the molten metal on the belt. A single belt type continuous casting apparatus for metal strips, wherein an electromagnetic brake is arranged on the molten metal pool on the metal strip withdrawal side of the molten metal pouring port to be poured into the pool.