JP2003275853A - Device for supporting continuously cast slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for supporting a continuously cast slab having excellent durability of a supporting roll for cast slab. <P>SOLUTION: In the device for supporting the continuously cast slab in a continuous casting facility disposing a plurality of cast slab supporting means composed of one pair of cast slab supporting rolls for supporting both long side surfaces in the cast slab and one pair of cast slab supporting side rolls for supporting both short side surfaces in this cast slab at the lower part of a continuous casting mold, the cast slab supporting side roll is dividing rolls divided into two or more in the shaft direction. Further, it is desirable that the dividing roll is non-driving roll composed of the roll supported with the roll shaft through a bearing to the roll shaft. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting facility, and more particularly to a slab support device which is disposed below a mold and which continuously supports thick slabs such as blooms and beam blanks.

[0002]

2. Description of the Related Art Continuous casting equipment cools molten metal poured from a ladle or a tundish through a nozzle,
The mold has a mold having a predetermined size, and a mold support device that supports the mold whose surface is solidified and continuously withdraws it from the mold. Conventionally, in this slab support device, a plurality of slab support means, in which a plurality of support rolls (guide rolls) are arranged along the slab, are arranged below the continuous casting mold. In this slab supporting means, in the case of a slab in which the thickness of the slab to be continuously cast is relatively thin, it is sufficient to support only the long side surface (the inner and outer surfaces of the curve) of the slab with a pair of support rolls. If the slab to be cast is a bloom or a beam blank, the slab thickness becomes thicker, so it is necessary to support not only the long side face (inside and outside of the curve) of the slab but also the short side face (side face of the slab). is there. If the short side surface (side of the slab) is not supported, there is a problem that cracking will occur due to bulging. Normally, the short side surface (side of the slab) of the slab is supported up to about 10 m downstream of the mold. ing.

For example, Japanese Examined Patent Publication No. 3-66056 discloses a frame-shaped box type in which guide rolls for guiding and supporting the four sides of a slab are divided into a plurality of stages in the traveling direction of the slab and integrally connected to a frame. There is described a slab guide roll stand that constitutes a unit consisting of.

[0004]

[Problems to be Solved by the Invention] However, Japanese Patent Publication No. 3-660
Even if the slab guide roll stand (cast slab supporting device) described in Japanese Patent Publication No. 56 is used, the short side surface (side surface) of the slab is supported in the curved type continuous casting device (continuous casting machine). There is a problem that uneven wear occurs on the slab supporting side roll (guide roll). This is especially noticeable when casting blooms with thick slab thickness or beam blanks.

The present invention advantageously solves the above-mentioned problems of the prior art, and particularly, the wear of the slab supporting roll supporting the short side surface of the slab can be reduced, and the slab supporting roll is excellent in durability and continuous. It is an object to propose a cast slab support device.

[0006]

In order to achieve the above-mentioned object, the present inventor has a curved continuous casting apparatus (continuous casting machine).
The cause of the uneven wear of the slab supporting side rolls in the above was investigated. As a result, the present inventor found that, in a curved continuous casting device (continuous casting machine), as shown in FIG. 2, the roll surface of the slab supporting side roll 3 that comes into contact with the curved inner surface side or outer surface side of the slab. It was found that uneven wear (where marked with a circle) occurs. The inventors of the present invention have found that, in a bending type continuous casting machine that bends and casts a slab, the peripheral speeds of the inner surface side and the outer surface side of the curve are different, so that the slab is supported at both ends of the slab support side roll 3. It was thought that slippage occurred between the and and uneven wear occurred.
Therefore, in order to prevent the uneven wear from occurring, the present inventor uses a slab supporting side roll as a split roll divided into two or more in the axial direction in order to reduce slippage with the slab as much as possible. I realized that it would be good to make it non-driven.

The present invention has been completed by further studies based on the above findings. That is, the present invention is a casting comprising a pair of slab support rolls that support both long side surfaces of a cast slab and a pair of slab support side rolls that support both short side surfaces of the slab. What is claimed is: 1. A continuous casting slab supporting device of a continuous casting facility, comprising a plurality of slab supporting means arranged below a continuous casting mold, wherein the slab supporting side roll is divided into two or more in the axial direction. The continuous casting slab support device, characterized in that, the present invention,
It is preferable that the split roll is a non-driving roll including a roll shaft and a roll supported by the roll shaft via a bearing.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The continuous casting slab support device of the continuous casting facility of the present invention is a device in which a plurality of slab support means are arranged below a continuous casting mold. The slab support means includes a pair of slab support rolls 2 that support both long side surfaces of the cast slab,
It comprises a pair of slab supporting side rolls 3 that support both short side surfaces of the slab. In the present invention, the slab supporting side roll 3 is a split roll 3a that is split into two or more parts in the axial direction. As a result, it is possible to reduce roll wear of the slab supporting side roll 3 due to slip caused by the bending of the continuous casting device (continuous casting machine).

FIG. 1 (a) shows a situation in which a pair of slab support rolls 2 and 2 and a pair of slab support side rolls 3 are disposed around the cross section of a continuously cast slab 1. The slab supporting roll 2 is arranged so that the roll axial direction is aligned with the long side direction of the slab, the slab supporting roll 2 contacts the long side surface of the cast slab 1, and supports the slab 1. In addition, the slab supporting side roll 3 is arranged so that the roll axial direction is aligned with the short side direction of the slab and is in contact with the short side surface (side surface) of the cast slab 1 to support the slab 1. It is set up.

In the present invention, the slab supporting side roll 3 is divided into two or more in the axial direction. FIG. 1A shows an example in which the slab supporting side roll 3 is divided into two axially divided rolls 3a and 3a, but in the present invention, the number of divisions is two.
It goes without saying that it is not limited to. A bearing 4 supports the roll shaft 5. The bearing 4 is supported by a frame (not shown).

As the number of divisions of the slab supporting side roll 3 increases by 2 or more, the slip between the slab 1 and the slab supporting side roll 3 decreases, and the followability to the peripheral speed of the slab becomes better. Roll wear of the slab supporting side roll 3 is reduced. For example, curve radius: 12000mm, slab thickness: 400m
In the case of m, there is a 3.3% difference in peripheral speed between the curved inner surface and outer surface of the slab, and when the slab supporting side roll is an integral roll, slippage with the slab due to the difference in peripheral speed of 3.3% at both ends of the roll occurs Will occur. As the number of divisions increases,
Slip with the slab generated at both ends of the roll is small, 1.7% in the two divisions and 1.1% in the three divisions. Further, as the number of divisions increases, the load load per bearing decreases, which also has the effect of contributing to a longer bearing life. However, there are restrictions on the method of supporting the split rolls (bearing size),
The number of divisions is preferably 3 because of the complexity of the structure and the like.

As shown in FIG. 1 (b), the split roll 3a is preferably a non-driving roll comprising a roll shaft 53 and a roll 3c supported by the roll shaft 53 via a bearing 3b. With such a configuration, the split rolls 3a, 3a can rotate independently of each other. The slab supporting side rolls 3 may have a cooling means such as external water cooling or internal water cooling.

The slab support roll 2 has bearings 4 at both ends.
1 as an integral roll rotatably supported via
As shown in (c), a non-driving roll including a roll shaft 52 and a roll 2c supported by the roll shaft 52 via a bearing 2b may be used. The slab support rolls 2 may have a cooling means such as water cooling from the outside or water cooling inside.

The material of the rolls 2c and 3c of the slab supporting roll 2 and the slab supporting side roll 3 is not particularly limited,
From the viewpoint of wear resistance, it is preferable to use 13Cr-based martensitic stainless steel or the like.

[0015]

EXAMPLE A slab supporting apparatus having the structure shown in FIG. 1A was installed under a continuous casting mold of a continuous casting apparatus, about 10 m from a meniscus.
30 units were installed between. The slab support rolls 2 and the slab support side rolls 3 are each of a sleeve type and are supported by roll shafts 52 and 53 via bearings. The slab supporting side roll 3 was a split roll divided into three in the axial direction. The rolls 2c and 3c were made of SUS 630. The cast slab supporting side roll 3 having such a structure can reduce roll wear and did not require roll replacement until the bloom and beam blank were subjected to 10,000 charge processing. In the conventional example using the integrated slab supporting side roll 3, the rolls were exchanged at 6000 charges.

[0016]

Industrial Applicability According to the present invention, roll wear of the slab supporting side rolls can be reduced, the frequency of roll replacement is reduced, and the production efficiency of continuous casting is remarkably improved.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing an embodiment of the present invention.

FIG. 2 is a sectional view schematically showing a conventional example.

[Explanation of symbols]

1 cast piece (continuous cast piece) 2 Slab support roll 3 Slab supporting side rolls 4 bearings (roller bearings) 5,52,53 Roll axis 3a Divided roll (Slab supporting side roll) 2b, 3b bearings (bearings) 2c, 3c roll

Claims (2)

[Claims] 1. A slab comprising a pair of slab support rolls for supporting both long side faces of a cast slab and a pair of slab support side rolls for supporting both short side faces of the slab. Support means,
A continuous casting slab supporting device of a continuous casting facility, wherein a plurality of slab supporting side rolls are arranged below the continuous casting mold, wherein the slab supporting side rolls are split rolls divided into two or more in the axial direction. Continuous casting slab support device. 2. The continuous cast slab support apparatus according to claim 1, wherein the split roll is a non-driving roll including a roll shaft and a roll supported by the roll shaft via a bearing. .