JP2003311382A - Supporting device for continuously cast slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a supporting device for continuously cast slab excellent in durability of a supporting roll for cast slab. <P>SOLUTION: In the supporting device for continuously cast slab in a curving type continuous casting facility which disposes 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 the cast slab, the cast slab supporting side roll is formed as a tapered roll and the small diameter side at the curving inner surface side of the cast slab and the large diameter side at the curving outer side of the cast slab, are disposed. It is desirable that the tapered roll is supported with a radius bearing and a thrust bearing and is non-driving. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A curved type continuous casting facility cools the molten metal poured from a ladle or a tundish through a nozzle to support a casting mold having a predetermined size and a casting whose surface is solidified. , Has a slab support device for continuously withdrawing 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 (the side surface of the slab) is not supported, there is a problem that the slab will crack due to bulging. Usually, the short side surface (the slab side surface) of the slab is about 10 m below the mold. We are supporting.

Regarding the slab support device, for example, in Japanese Examined Patent Publication No. 3-66056, a frame for integrally supporting guide rolls for guiding and supporting the four surfaces of the slab in a plurality of stages in the traveling direction of the slab is integrally formed. There is described a slab guide roll stand that constitutes a frame-shaped box-shaped unit connected to the.

[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 in a curved type continuous casting equipment, it is possible to reduce the wear of the slab supporting roll that supports the short side surface of the slab, and to support the slab. It is an object of the present invention to propose a continuous cast slab support device having excellent roll durability and abrasion resistance.

[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 has found that in a curved type continuous casting apparatus (continuous casting machine), as shown in FIG. 2, a roll of the slab supporting side roll 3 that is in contact with the curved inner surface side or the curved outer surface side of the slab. It was found that uneven wear (where marked with a circle) occurs on the surface. The inventors of the present invention have found that, in a curved type continuous casting machine that bends and casts a slab, the peripheral speeds of the curved inner surface side and the curved outer surface side of the slab are different, so that both end portions of the slab support side roll 3 are It was considered that uneven wear occurred due to slip between the roll surface and the slab. Therefore, the present inventor, in order to reduce the slip between the roll surface and the cast piece as much as possible,
We have found that it is better to make the slab supporting side roll a taper roll and not drive it to prevent uneven wear.

The present invention has been completed by further studies based on the above findings. That is, the present invention is a casting consisting of 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. A continuous casting slab supporting device of a curved type continuous casting facility in which a plurality of slab supporting means are arranged below a continuous casting mold, wherein the slab supporting side roll is a taper roll, and the taper roll has a small diameter. The side is a curved inner surface side of the slab, the large diameter side of the taper roll is a curved outer surface side of the slab is a continuous casting slab support device, wherein, in the present invention, the It is preferable that the taper roll is supported by the radial bearing and the thrust bearing and is not driven.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The continuous casting slab support device of the curved type continuous casting equipment 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 comprises a pair of slab support rolls 2 that support both long side faces of the cast slab and a pair of slab support side rolls 3 that support both short side faces of the slab. Become. In the present invention, the slab supporting side roll 3 is a taper roll 3a, the small diameter side of the taper roll 3a is the curved inner surface side of the slab, and the large diameter side is the curved outer surface side of the slab. As a result, the slab supporting side roll 3 caused by the bending of the curved continuous casting device (continuous casting machine)
The roll wear can be reduced.

In FIG. 1, a pair of slab support rolls 2 and 2 are arranged on the long side of the continuous casting slab 1, and a pair of slab support side rolls 3 and 3 are arranged on the short side of the slab. Shows the status established. The slab support 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 the present invention, the slab supporting side rolls 3 are taper rolls 3a, 3a. The taper roll 3a serving as the slab supporting side roll 3 has its roll surface in contact with the short side surface (side surface) of the slab 1 and has the smaller diameter side of the end diameter d on the inner side of the slab 1. The large diameter side of the end diameter D is arranged so as to be the curved outer side of the slab 1, and the slab 1 is supported. As a result, slippage between the slab and the roll is reduced, and roll wear can be reduced.

The taper roll 3a is an integral type,
It is preferable that the roll shaft is supported by the radial bearing 4a or the thrust bearing 4b and is not driven. The non-driving reduces the slippage between the slab and the roll and reduces the roll wear. Note that, instead of the integrated roll, there is no problem even if a sleeve type roll supported by a roll shaft through a bearing is used.

The static pressure of the molten metal acts on the slab supporting side rolls which support the side faces (short side faces) of the slab.
In the slab supporting apparatus of the present invention which uses the taper roll as the slab supporting side roll, the roll shaft is inclined with respect to the short side surface of the slab, so that a thrust load is generated on the roll shaft. Therefore, in addition to the radial load, it is preferable to install the thrust bearing 4b on the roll shaft on the large diameter side in addition to the radial bearing 4a in order to retain the thrust load. That is, in the taper roll 3a, as shown in FIG. 1, the roll shaft on the small diameter side is a radial bearing 4a,
The roll shaft on the large diameter side is provided with a radial bearing 4a and a thrust bearing 4
It is preferable to support by b. By installing the thrust bearing, the radial bearing has a long life.

Further, in the slab supporting device of the present invention, the slab supporting side rolls are tapered rolls, so that the bearing box 3
From the problem of the arrangement of the support mechanism of each roll such as b, the slab support roll 2 and the taper roll 3a may be arranged alternately in the slab longitudinal direction, instead of being arranged in the same slab cross section. preferable. Needless to say, the bearing box 4 is supported by a frame (not shown).

The taper roll used as the slab supporting side roll in the present invention has a bending radius Rmm and a slab thickness H.
From mm, it is preferable to determine the small diameter: dmm and the large diameter: Dmm so as to satisfy the following expression d / D = (RH) / R. The slab supporting side rolls 3 may have a cooling means such as external water cooling or internal water cooling.

Further, as shown in FIG. 1, it is preferable that the slab supporting roll 2 is an integral roll whose both ends are rotatably supported via radial bearings 4, but there is no problem with the sleeve type. In addition, these slab support rolls 2 include
It may have a cooling means such as external water cooling or internal water cooling. The material of the slab supporting roll 2 and the taper roll 3a as the slab supporting side roll is not particularly limited, but 13Cr martensitic stainless steel is preferable from the viewpoint of wear resistance and corrosion resistance.

[0015]

EXAMPLE Thirty slab supporting devices having the structure shown in FIG. 1 were installed below the continuous casting mold of a curved continuous casting device (curved radius R: 12000 mm) and within 10 m from the meniscus. The slab supporting side roll 3 was an integrated taper roll, and the roll shaft was supported by a radial bearing and a thrust bearing as shown in FIG. The taper roll has a small diameter d: 193 mm and a large diameter D: 200 mm (roll length: 400 mm). The slab support roll 2 is a flat roll,
The roll shaft was supported by radial bearings. The material of each roll was made of SUS 630.

By using the slab supporting device having such a structure, a bloom (slab thickness H: 400 mm), a beam blank
(Slab thickness H: 400 mm) was continuously cast. The d / D of the taper roll was 0.965, and (RH) / R was 0.96.
7, the slippage between the taper roll and the slab has almost disappeared. As a result, the cast slab supporting side roll 3 (taper roll 3a) was exchanged after the 10,000 charging process. In the conventional example using the flat roll type slab supporting side roll 3, the roll was exchanged at 6000 charges.

[0017]

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 3a taper roll 4 bearing box 4a radial bearing 4b thrust bearing 5 roll axis

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 curved type continuous casting facility, wherein a plurality of slabs are provided below the continuous casting mold, wherein the slab supporting side roll is a taper roll, and the small diameter side of the taper roll is the slab. The continuous casting slab supporting device, wherein the large diameter side of the taper roll is arranged on the curved outer surface side of the slab on the curved outer surface side of the slab. 2. The continuous cast slab support apparatus according to claim 1, wherein the taper roll is supported by a radial bearing and a thrust bearing and is not driven.