JP3242351B2 - Roll bearing structure in guide roll segment for continuous casting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a roll bearing structure in a guide roll segment for continuous casting.

[0002]

2. Description of the Related Art In a continuous casting facility, molten steel or the like poured into a mold is guided by a number of guide rolls arranged below the mold and cooled and solidified while being drawn downward to continuously produce cast slabs. As shown in FIG. 7, these guide rolls R are mounted on the segment frame 8 by a suitable number via a bearing box 3 having a built-in bearing. By the way, in the guide band in the continuous casting equipment, a centering function is required because the roll is bent, and a self-aligning roller bearing is adopted on the fixed side, and the roll extends in the axial direction due to thermal expansion. On the free side, a bearing that allows thrust is used. That is, as shown in FIG. 5, the left end of the roll R is fixed to the self-aligning roller bearing 1 on the fixed side.
The right end uses a cylindrical roller bearing 50 with a free-side alignment ring.

[0003]

As shown in FIG. 6, a cylindrical roller bearing 50 with an aligning ring according to the prior art is provided with an aligning ring 51 as shown in FIG.
(Spherical seat) is required between the cylindrical roller 52 and the outer ring 53, and for the same load capacity, by the thickness of the aligning ring 51,
There was a disadvantage that the outer diameter became large. For this reason, the outer diameter of the bearing has increased and the size of the bearing box has also increased. However, in the continuous casting facility, the smaller the roll pitch of the guide roll, the smaller the slab bulging amount, so that high-speed casting is possible.However, in the above conventional example, the roll pitch cannot be reduced, and the slab To prevent bulging or high speed casting. In view of such circumstances, an object of the present invention is to provide a roll bearing structure with a small outer diameter that can reduce the roll pitch and enable high-speed casting.

[0004]

According to a first aspect of the present invention, a bearing for mounting a guide roll to a segment frame comprises a fixed-side bearing and a free-side bearing allowing thrust, and the fixed-side bearing is self-aligning. A roller bearing, wherein the free-side bearing has a radius of curvature equal to or larger than the spherical roller such that the center of curvature is a spherical roller having a large radius of curvature farther than the center of the bearing and is in line contact with the outer periphery of the spherical roller. It is a large-curvature spherical roller bearing comprising an outer ring and an inner ring having curved rolling surfaces.

According to the first aspect of the present invention, since the spherical rollers and the rolling surfaces of the inner and outer rings have a curvature, the centering function can be exhibited, and the large curvature allows the outer ring and the inner ring to move in the axial direction. Deviation and thrust can be tolerated. As described above, although the centering function and the thrust function can be exhibited, the outer diameter can be reduced because the centering ring is not provided.
For this reason, by reducing the roll pitch of the guide roll,
The bulging prevention effect can be enhanced, and the casting speed can be increased.

[0006]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a roll bearing structure according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a large-curvature spherical roller bearing 2, FIG.
FIG. 4 is an explanatory view of the centering function and the thrust function of the large curvature spherical roller bearing 2.

In FIG. 1, R is a guide roll, and 1 is a known self-aligning roller bearing on the fixed side. In the roll bearing structure of the present embodiment, a large curvature spherical roller bearing 2 is used on the free side of the roll R. 3 is a bearing box.

As shown in FIGS. 1 and 2, a large-curvature spherical roller bearing 1 according to the present embodiment includes a spherical roller 4, an outer ring 5, and an inner ring 6, and does not use a centering ring as in the conventional example. .

As shown in FIG. 2, the spherical roller 4 has a center of curvature farther than the center of the bearing, and as a result, has a large radius of curvature R. FIG. 3 shows a conventionally known ordinary spherical roller bearing 1 in which the radius of curvature R0 of the outer raceway coincides with the center of the bearing. Compared to this ordinary spherical roller bearing, the radius of curvature of the spherical roller bearing 4 of the present invention is 2.2 to 10 times as long.

The radius of curvature of the rolling surfaces of the outer race 5 and the inner race 6 is the same as or slightly larger than the radius of curvature of the spherical roller 4.

The advantages of the large-curvature spherical roller bearing 2 having the above-mentioned structure are as follows when compared with other types of bearings. Cylindrical roller bearings allow axial displacement (thrust), but cannot absorb shaft runout due to misalignment or deflection.
Spherical roller bearings can absorb shaft runout, but cannot absorb axial displacement (thrust). Needle roller bearings are compact, but cannot absorb shaft runout. However, the large curvature spherical roller bearing 2 of the present invention has all the advantages of the above three types and overcomes all the disadvantages. That is,
The load capacity is 1.3 times that of roller bearings, the ability to absorb shaft runout, ie, the centering function is about 10 times that of cylindrical, conical and needle roller bearings, and the axial displacement capacity is 1 times that of ordinary spherical roller bearings.
It is 00 times.

Next, a description will be given of the shaft runout absorbing action and the axial displacement absorbing action of the large curvature spherical roller bearing 2. FIG. 4A shows a state at a fixed position, that is, a state of zero axial shake and zero axial displacement. FIG. 3B shows a state in which the shaft is shaken due to the deflection of the roll R or the like. In this case, the spherical rollers 4 on the opposite sides in the radial direction of the shaft (up and down in the figure) are displaced in the directions opposite to each other in the axial direction. It can absorb axial blur. FIG. 4C shows a state in which an axial displacement has occurred. In this case, the outer ring 5 and the inner ring 6 are displaced in opposite directions to each other, so that the axial displacement of the roll R can be absorbed.
Needless to say, even if the shaft shake and the axial displacement are combined, they can be absorbed.

As described above, according to the roll bearing structure of the present embodiment, it is possible to sufficiently absorb the axial runout and the thrust displacement due to the deflection of the roll, and to have a compact configuration having no alignment ring. Therefore, the outer dimensions of the bearing housing can be reduced, and the roll pitch can be reduced. In addition, this makes it possible to increase the speed of continuous casting.

[0014]

According to the first aspect of the present invention, the spherical roller and the rolling surfaces of the inner and outer rings have a curvature, so that the centering function can be exhibited, and the large curvature absorbs the axial displacement. Although it is possible to exhibit such a centering function and a thrust function, the outer diameter can be reduced because it has no centering ring. For this reason, it is possible to reduce the roll pitch of the guide roll, enhance the effect of preventing bulging, and speed up casting.

[Brief description of the drawings]

FIG. 1 is a sectional view of a roll bearing structure according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a large curvature spherical roller bearing 2;

FIG. 3 is an enlarged sectional view of the self-aligning roller bearing 1;

FIG. 4 is an explanatory diagram of a centering function and a thrust function of the large curvature spherical roller bearing 2.

FIG. 5 is a sectional view of a conventional roll bearing structure.

FIG. 6 is an enlarged sectional view of a cylindrical roller bearing 50 with an aligning ring.

FIG. 7 is a side view of a guide roll segment in a continuous casting facility.

[Explanation of symbols]

 R Guide roll 1 Self-aligning roller bearing 2 Large curvature spherical roller bearing 3 Bearing box 4 Spherical roller bearing 5 Outer ring 6 Inner ring

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B22D 11/128 340 F16C 23/08

Claims (1)

(57) [Claims] 1. A bearing for attaching a guide roll to a segment frame comprises a fixed-side bearing and a free-side bearing allowing thrust, the fixed-side bearing is a self-aligning roller bearing, and the free-side bearing has a center of curvature. Consists of a spherical roller having a large radius of curvature farther than the center of the bearing, and an outer ring and an inner ring having rolling surfaces curved with a radius of curvature equal to or larger than the spherical roller so as to make line contact with the outer periphery of the spherical roller. A roll bearing structure in a guide roll segment for continuous casting, which is a large curvature spherical roller bearing.