JPH0576994A - Continuous casting apparatus for plural-layered cast slab - Google Patents

Abstract

PURPOSE:To provide a continuous casting apparatus enabling continuous supply of molten metal, i.e., enabling sequentially continuous casting operation in the continuous casting for plural-layered cast slab. CONSTITUTION:In the continuous casting apparatus for plural-layered cast slab 3, two sets of casting ladles 10a, 11a for outer layer molten metal and two sets of casting ladles 10b, 11b for inner layer molten metal are mounted on casting ladle trucks 12a, 12b arranged on tundishes 5a, 5b for the outer layer and the inner layer, respectively and the molten metal can be poured from any casting ladle of two sets into an immersion nozzle 7a, 7b. By this method, even at the time of exchanging the casting ladle, the molten metal can continuously be supplied and the lowering of the molten metal temp. at the time of exchanging the casting ladle is restrained and trouble of the nozzle clogging, etc., can be prevented and resource of fuel, etc., can be saved and the productivity can be improved.

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 capable of continuously supplying molten metal when two kinds of molten metals having different compositions are made into multiple layers and solidified to produce a multilayer cast slab. Regarding

[0002]

2. Description of the Related Art An apparatus for producing a multi-layer cast product by continuous casting is disclosed, for example, in Japanese Patent Application No. 2-188069.
A surface ladle molten metal casting ladle having an immersion nozzle and an inner layer molten metal casting ladle are mounted, and a ladle trolley capable of lifting and lowering the two pots independently, and a tundish having a long dipping nozzle There has been proposed a continuous casting apparatus for a multi-layer cast product, which is equipped with a tundish having a short dipping nozzle and is configured by a tundish car capable of independently lifting and lowering the two tundish.

According to this technique, as shown in FIG. 3, a single ladle trolley is provided with a molten metal ladle 21b for the surface layer and a molten ladle 21a for the inner layer molten metal, and the ladle is independently moved up and down. In addition, a tundish 22a having a long immersion nozzle 23a for the inner layer metal for receiving molten steel from the casting ladle and a tundish 22b having a short immersion nozzle 23b for the surface layer metal are provided, and these two tundishes are independently provided. Installed in one tundish car that can be lifted up and down.

The tundish 22 on the short nozzle side
Molten steel is injected into the mold 24 from b, and after injecting a fixed amount,
The inner layer molten metal casting pot 21a and the tundish 22a having a long immersion nozzle descend in conjunction with the withdrawal of the dummy bar 25, and when the tip of the long immersion nozzle 23a starts to be immersed in the molten steel in the mold, the long immersion nozzle 23a. Then, the injection of the metal for the inner layer is started. As a result, the drop in molten steel temperature can be minimized even at the initial stage of injection, and problems such as nozzle clogging can be prevented. Reference numeral 26 is an electromagnet that forms a magnetic field band in the molten steel.

[0005]

By the way, in such a continuous casting apparatus, in order to perform so-called continuous casting in which molten metal can be continuously supplied, the outer layer inner pot and the inner layer pot are replaced with the next pot. At this time, the temperature of the molten metal in the tundish is lowered to remove the molten metal-depleted pre-casting pot from the pot trolley, and then the next casting pot filled with molten metal is installed. There is a risk that the molten metal will solidify inside and become clogged.

Further, even if the time required for replacing the pot is shortened, the pot may come into contact during the replacement work because the distance between the outer layer casting pot and the inner layer casting pot is short. Further, in the case of two or more molds, such a continuous casting apparatus cannot be applied because the space between the molds is small.

The present invention has been made in view of the above problems,
Provided is a continuous casting device capable of continuously supplying molten metal when producing a multi-layer cast product.

[0008]

DISCLOSURE OF THE INVENTION The present invention for solving the above-mentioned problems is provided in a continuous casting apparatus for a multi-layer cast product using two dipping nozzles for outer layers and inner layers having different lengths.
A tundish is provided on the tundish car for the outer layer and the tundish for the inner layer, which are installed to face each other on the mold of the apparatus, and a tundish is provided so that the tundish can be moved up and down, and an independent ladle is provided on a pot carrier provided on the tundish for the outer layer and the inner layer. 2 with lifting jacks each
An outer layer molten metal casting pot and two inner layer molten metal casting pots can be mounted, and the outer layer and inner layer tundish can be loaded with molten metal into the dipping nozzles from each of the two pots. It is a continuous casting apparatus for multi-layer cast slabs, which has a structure capable of pouring.

[0009]

Since the present invention is constructed as described above, when performing continuous casting of a multi-layer cast using this apparatus, for example, immediately before running out of one molten metal in the outer layer molten metal casting pot, The supply of the molten metal is started from the other casting pot, the casting pot is replaced during this period, and the molten metal is continuously supplied. As a result, the temperature of the molten metal in the tundish does not decrease, troubles such as nozzle clogging can be prevented, and continuous casting becomes possible.

[0010]

An embodiment of the present invention will be described in detail with reference to the drawings. Figure 1 is a side view of the entire continuous casting machine with a partial cross section.
FIG. 2 is a plan view of FIG.

The mold 1 is formed of a rectangular copper plate, and a static magnetic field device 2 for forming a static magnetic field band in the molten steel at an intermediate position of the mold.
Is attached, and the multi-layer cast slab 3 is cast by the molten metal supplied from the two immersion nozzles described later.

On the mold 1, tundish cars 4a and 4b for outer and inner layers are installed facing each other in the longitudinal direction of the mold, and a support frame 8 is placed on the tundish car.
tandish lifting device 6 via a and 8b, respectively.
There are provided tundishes 5a and 5b for the outer layer and the inner layer, which are supported by a and 6b so as to be able to move up and down.

The outer layer tundish 5a has a short outer layer immersion nozzle 7a inserted into the mold 1, and the inner layer tundish 5b has a long inner layer immersion nozzle 7b.
Are attached respectively.

On the respective tundish 5a, 5b, there are provided pot ladle trucks 12a, 12b via pot support devices 9a, 9b, and further, two pots for outer layer molten metal 10a are provided on the trucks, respectively. , 11a and two inner layer molten metal casting pots 10b, 11b can be mounted in parallel.

Each of the above casting pots 10a, 11a, 10b, 11
b is provided with independent casting pot lifting jacks 13a and 13b attached to the casting pot supporting arms 14a and 14b, respectively, and the casting pots can be raised and lowered by swinging the supporting arms 14a and 14b.

The tundish 5a, 5b for each of the outer and inner layers is, as shown in FIG. 2, the ladle 10a, 11b.
It has a T-shape having grooves in three directions so that molten metal can be injected into the respective immersion nozzles 7a and 7b from any of the two ladles a and 10b and 11b.

When performing continuous casting of a multi-layer slab using the above-mentioned continuous casting apparatus, molten metal is injected by using one of the two, for example, the outer layer and inner layer ladle 10a, 10b. Immediately before the molten metal in these casting pots disappeared, the next casting pot 11 filled with the molten metal of the same composition was used.
The a and 11b are mounted on the pot supporting arms 14a and 14b. Immediately after the molten metal in the first ladle is exhausted, the molten metal is poured into the tundish 5a, 5b from the subsequent ladle.

As a result, the temperature of the molten metal in the tundish 5a, 5b does not decrease, the molten metal is continuously supplied to the mold 1, and it becomes possible to continuously cast a multi-layer cast slab. Therefore, even when the casting pot is replaced, the temperature drop of the molten metal can be minimized, and troubles such as nozzle clogging can be prevented.

Further, by using the above apparatus, by filling the next pot with molten metal having a composition different from that of the pre-casting pot,
It is possible to continuously cast only the outer layer, only the inner layer, or the multi-layer cast slab having different components in both the outer and inner layers.

[0020]

By using the apparatus of the present invention, it is possible to continuously supply the molten metal even when the casting pot is replaced, so that the temperature drop of the molten steel when the casting pot is replaced can be minimized, and therefore, Trouble such as nozzle clogging can be prevented.

Further, by filling the next casting pot with molten metal having a composition different from that of the previous casting pot, only the outer layer, only the inner layer or the outer layer
It is possible to successively produce multi-layer cast slabs having different components for both inner layers, so that it is possible to save resources such as fuel and improve production efficiency.

[Brief description of drawings]

FIG. 1 is a side view showing a partial cross section of the entire continuous casting apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a schematic side view showing a conventional example of a continuous casting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold 2 Static magnetic field device 3 Multi-layer slab 4a Outer layer tundish car 4b Inner layer tundish car 5a Outer layer tundish 5b Inner layer tundish 6a Outer layer tundish lifting device 6b Inner layer tundish lifting device 7a Outer layer Immersion nozzle 7b Inner layer immersion nozzle 8a Outer layer tundish support frame 8b Inner layer tundish support frame 9a Outer layer pan support device 9b Inner layer pan support device 10a, 11a Outer layer molten metal casting pan 10b, 11b Inner layer molten metal For ladle 12a Outer layer ladle dolly 12b Inner layer ladle dolly 13a Outer layer ladle lift jack 13b Inner layer ladle lift jack 14a Outer layer ladle support arm 14b Inner layer ladle support arm

Claims (1)

[Claims] 1. A continuous casting apparatus for casting a multi-layer cast using two dipping nozzles for outer and inner layers having different lengths, one for the outer layer and one for the inner layer placed facing each other on the mold of the apparatus. A tundish is provided on the tundish car so that the tundish can be moved up and down, and two pots for the molten metal of the outer layer, each of which is provided with an independent cast pot lifting jack on the pot carrier provided on the tundish for the outer layer and the tundish for the inner layer, and Two inner layer molten metal casting pans can be mounted, and the outer and inner layer tundish has a structure in which molten metal can be injected into the dipping nozzles from both of the two ladles. Continuous casting equipment for multi-layer slabs.