JPH03110049A - Bearing device for divided roll for continuous casting - Google Patents

Abstract

PURPOSE:To improve the generation of roll deformation of roller apron, bulging of a cast slab between rolls and lowering of service life of roll bearing accomanying high velocity casting by forming intermediate bearing for adjacent rolls with T shape block to use this in common with both rolls. CONSTITUTION:The bearing device 9 works as bearing for the rollers 31a, 31b in the roller apron in continuous casting equipment. Further, the bearing device 9 is composed of the T-shape block 91 and the bearings 92. The block 91 supports end parts of the rolls 31a, 31b at right and left sides as rotatable through the bearings 92 and fixed to the roller apron body 32, and by setting the block shifting to each set of the rolls 31a, 31b related to width direction of the cast slab 7, the adverse effect of the bulging caused by arrangement of the bearing device 9 is reduced. Further, by the bearing device 9, deflection curve in connecting part of the rolls comes to continuous line. Therefore, the bulging between the rolls is effectively restrained and the service life of bearing can be drastically improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a bearing device for split rolls used in continuous casting equipment.

(b) Conventional technology Figure 6 shows a typical conventional continuous casting equipment.

Molten steel is injected into a mold 2 from a tandem steel 1, solidifies while passing through a roller nigeron 3, and becomes a continuous slab 7. After that, it passes through a drawing bending roll 4, a straightening roll 5, and is cut into a slab of a predetermined length by cutting a6. It is cut to 7.

The roller apron 3 used in casting melt supports the slab 7 between rolls and receives reaction force when the slab 7 is bent and straightened by the straightening rolls 5. Therefore, the roller apron 3 is an important device when casting molten steel.

Recent continuous ironing technology is directly connected to hot rolling mills, and high-speed casting is desired. However, as high-speed casting technology is developed, the thermal load applied to the continuous casting mold 2 increases.
Problems such as peeling of the inner plating of the mold due to increased heat load and wear due to deformation of the copper plate are occurring.

On the other hand, the roller apron 3 provided at the lower part of the mold is also greatly affected by the heat load due to high-speed casting, causing problems such as roll deformation (bending) and breakage. As a countermeasure against this problem, efforts have been made to reduce the thermal load by 1 and prevent roll deformation by increasing the roll diameter of the roller apron 3, cooling the roll, etc.

However, increasing the roll diameter and cooling the rolls also causes deterioration of slab quality during high-speed casting.
When roll bending is reduced by increasing the roll diameter, the roll spacing becomes wider and the slab support span between the rolls becomes longer. In the case of high-speed casting, as shown in FIG. 7, the solidification shelf 1 of the slab 7 is thin, and bulging (swelling of the slab in the thickness direction) 7 occurs between the rolls 31 of the roller apron 3.
2 occurs. This bulging 72 is squeezed by the next roll 31 during drawing of the slab, causing strain on the inner surface of the solidification shelf 1 and eventually causing internal cracks.

Roll cooling cools not only the roll but also the slab, resulting in overcooling of the slab, resulting in a drop in slab surface temperature and cracking on the slab surface.

Next, as a measure against roll deformation, as shown in FIG. 8, the roll 31 is made smaller in diameter and divided into a plurality of parts in the axial direction.
It has been proposed to reduce the load applied to a single roll to reduce deformation, reduce the roll pitch, and suppress bulging.

In recent years, small diameter split roll type roller aprons have become mainstream. If the diameter is to be made smaller than the current size, the current bearings will be difficult to use and will have a short bearing life.

In a roller apron, the conventional 150+m roll is not sufficient to suppress inter-roll bulging, and it is necessary to further reduce the diameter. In that case, the particular problem is that
As shown in FIG. 8, left and right small diameter divided rolls 31a, 3
1b, intermediate bearing devices 8a and 8b. When the conventional intermediate bearing devices 8a and 8b are used, the distance between the left and right rolls increases, and a new head of local bulging occurs in the width and direction of the slab. Furthermore, because conventional bearings are directly exposed to radiant heat from the slab, their lifespan is extremely short, and they are often used in actual operations.

(c) Problems to be Solved by the Invention The problems to be solved by the present invention are to improve the roll deformation of the roller apron, the bulging of the slab between the rolls, and the decrease in the life of the roll bearings that occur during high-speed casting.

(d) Means for Solving the Problems The bearing device of the present invention is a bearing device that rotatably supports a small diameter roll divided into a plurality of parts in the axial direction in a roller apron of a continuous casting facility, and the bearing device rotatably supports a small diameter roll divided into a plurality of parts in the axial direction. The above problem is solved by forming the intermediate bearing with a T-shaped block and sharing it with both rolls.

(E) Embodiment Referring to FIG. 1, an embodiment of a bearing device for a continuous S distance divided roll according to the present invention will be described.

The bearing device 9 of the present invention functions as a bearing for rollers 31a and 31b in a roller apron of continuous casting equipment.The rollers 31a and 31b are small diameter rolls divided into a plurality of parts (in this embodiment, divided into two) in the axial direction.

The bearing device 9 of the present invention is made up of a T-shaped block 91 and a bearing 92. Block 91 is bearing 92
The end portions of the left and right rolls 31a and 31b are rotatably supported. Block 91 is the machine frame 3 of the roller apron.
It is fixed at 2.

In the illustrated example, the rolls 31a and 31b are formed into a female block 91.
Although it is formed into a male shape, it may be the other way around.

The bearing devices at both ends are similar to conventional ones.

As shown in FIG. 2, with respect to the width direction of the slab 7, it is preferable that the installation position of the bearing device 9 of the present invention is shifted for each roll 31a, 31b. The adverse effects such as bulging caused by this are further reduced.

As shown in FIG. 5(A), according to the conventional bearing devices 8a and 8b located in the intermediate position, the deflection curve of the connecting portion of the rolls 31a and 31b becomes discontinuous. On the other hand, according to the bearing device 9 of the present invention, the deflection curve of the roll connection portion becomes continuous, as shown in FIG.

According to the conventional bearing devices 8a and 8b, as shown in FIG.
On the other hand, the bearing device 9 of the present invention
According to FIG. 1, the distance between adjacent roll ends S2
is about 70w (when the roll diameter is 110fi),
In this way, the length of the unsupportable portion of the roll is halved.Also, in terms of cooling the inside of the roll, as shown in FIG.
, 33-b can be shared, reducing the number of piping systems.

Figure 3 shows a comparative example of roll bending A when using a conventional bearing device and roll bending B when using the bearing device of the present invention. , where the maximum value of , is 1.6 Also, a comparison of the bearing life of both is shown in FIG.

The bearing life is 1 less than the number of replacement charges of conventional bearing devices.

(f) Effects As explained above, according to the bearing device of the present invention, the life of the bearing can be significantly improved while effectively suppressing inter-roll bulging.

[Brief explanation of drawings]

FIG. 1 is a side view showing a roll support mechanism using the bearing device of the present invention. FIG. 2 is a front view showing the arrangement of rolls using the bearing device of the present invention. FIG. 3 is a graph showing the roll curvature ratio by the device of the present invention. FIG. 4 is a graph showing the bearing life of the device of the present invention. FIG. 5 is an explanatory diagram showing the roll deflection curves of the device of the present invention and the conventional device. Fig. 6 is an explanatory diagram of a typical conventional continuous casting equipment, Fig. 7 is an explanatory diagram showing bulging between rollers of a slab in a roller apron, and Fig. 8 is an explanatory diagram showing a roll support mechanism using a conventional bearing device. Side view 6 9: Bearing device 91: T-shaped block 92: Bearing 93: Piping

Claims (1)

[Claims] A bearing device for rotatably supporting small diameter rolls divided into a plurality of parts in the axial direction in a roller apron of continuous casting equipment, in which the intermediate bearing of adjacent rolls is formed by a T-shaped block and shared by both rolls. Bearing device for split rolls for continuous casting featuring: