JPS6015009A - Roll chock of rolling mill - Google Patents

Abstract

PURPOSE:To bear a large bender force and to enlarge a shape controlling range by dividing a roll chock of work roll into an inside roll chock and an outside one. CONSTITUTION:The inner rings of a No.1 roller bearing 2 and a No.2 roller bearing 3 mounted on an inside roll chock 5 are constructed to be free from a work roll 1. Because only a radial load (mainly a bender load) is burdened on these roller bearings 2, 3, comparatively thin-type bearings can be used, and the roll-neck diam. of the work roll 1 can be made larger by an amount corresponding to the amount saved by using said bearings. The thickness of a No.3 roller bearing 4 is increased by providing a step to the journal part of roll 1; then a bearing having a larger loading capacity can be selected, which is durable for a bender load and a thrust load in the same degree as compared with the durabilities of the No.1 and No.2 roller bearings 2 and 3.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rolling mill that controls the shape of the rolling mill by applying a roll bender force to a work roll bearing box, and is particularly suitable for applying a strong bender force. The present invention relates to the structure of a roll bearing box for a rolling mill.

[Background of the invention]

A work roll bearing box provided on a work roll of a conventional rolling mill has four rows of Taber bearings, and has a structure in which a bender force is applied to the work roll bearing box by a hydraulic cylinder device or the like. Therefore, the work roll bearing box has a structure that bears both the bender force and the thrust load of the roll, and in order to fix this bearing box to the work roll, the roll neck part is provided with a stepped part on the body side of the roll. There is. However, in conventional bearing boxes, the outer diameter is limited by the work roll diameter, and the inner diameter of the bearing box is limited by maintaining the roll neck (for rolling torque and bender load).
Furthermore, the width dimension in the direction of the roll axis poses a problem in the ability of the bearing box to follow the deflection of the roll, and for these reasons, there is a problem in that the bending force cannot be increased with conventional roll bearing shafts.

[Purpose of the invention]

An object of the present invention is to provide a bearing box for a work roll that can impart a high bending force, and to provide a rolling mill with a wide shape control range.

[Summary of the invention]

The present invention is characterized by a bearing box structure that can withstand high bending forces, by eliminating the stepped part for fixing the bearing on the body side of the roll neck, and by forming a neck shape with a large radius. Increase the number of armrests installed in the bearing box,
Moreover, by dividing the bearing box, a stepped part is provided on the roll to accommodate the shaft deflection caused by the bender force acting on the roll neck, and the burden of the roll thrust force is placed on the bearing located on the opposite side of the body. By increasing the thickness of the bearing in this part of the body side bearing and also bearing the pender force and roll thrust force, the load capacity of the whole bearing is increased, and the rolling torque and To obtain a roll bearing box having roll neck strength commensurate with high bending strength.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A bearing box for a rolling roll, which is an embodiment of the present invention, will be explained with reference to the drawings. In FIGS. 1 and 2, a work roll 1 that is shifted in the roll axis direction and on which a pending force is applied includes a shaft 10, a shaft bearing 2, and a flat shaft 20, which constitute an inner bearing box.
The roller bearings 3 are provided adjacent to each other in the large diameter portion of the roll neck, and the original A1. The inner rings of the A2 bearings 2 and 3 are configured to be in a free state with the roll, and the outer rings of the AI and A2 bearings 2 and 3 are formed on the body side of the roll 1 by combining the A10-rule bearing 2 and the A-20-rule bearing 3. It is fixed inside a certain inner bearing box 5. In addition, the A30-rule bearing 4 has a step formed on the journal portion of the roll 1, and a threaded ring 13 on the small diameter portion 1b.
It is fixed to the cylinder by means such as. The outer ring of this 30-wheel bearing 4 is fixed to an outer bearing box 6.

Each of these bearings 2, 3.4 is configured to include a double row of tapered roller bearings.

The inner bearing box 5 and the outer bearing box 6 are connected by a link plate 7. The above connection method involves forming convex portions 5b and 6b at the center of the outer surface of each bearing box 5 and 6, respectively, and fitting holes 7a and 7b formed at both ends of the link plate 7 into the convex portions so that the upper portions of these convex portions are inserted inside. It is covered with a bearing box liner 8 and an outer bearing liner 9 to prevent scale and the like from entering. And each bearing 2 in the pengu block 10
The bender cylinder 11a is located at the position corresponding to ゜3.4.

11b, llc, respectively, and each bender cylinder ram 12a, 12b, 12c is connected to each bearing box 5.
, 6 has a structure that imparts bending force to the ears 5a, 6a.

The conovender block 10 is configured to follow the shift of the work roll 1 (not shown).
.

Therefore, the flattened 10-hole bearing 2 installed in the inner bearing box 5
Since the bearing inner ring of the A2q-le bearing 3 is configured to be free by being rolled over the work roll 1, only radial load (mainly bender load) acts on these roll bearings 2.3. A relatively thin bearing can be used, and the roll neck diameter of the work roll 1 can be increased accordingly.

In addition, by making the bearing inner ring loose, there is no need to form a stepped part for the bearing on the roll body side, which is a key point for roll neck strength, and a larger radius can be created in the part facing the bearing end. By being able to form a roll neck shape (see part 2 in Figure 1), it becomes possible to handle higher bending loads than before.

The flat 30-hole bearing 4 installed in the outer bearing box 6 has a thickness increased by adding a step to the journal portion of the roll 1, and this makes it possible to select a bearing with a large load capacity. shi, bender load and thrust load A10-
It can be borne with the same lifespan as the 20-degree bearing 2 and the 20-degree bearing 3. This makes it possible to apply a large bender load to the entire Shiroll bearing.

Although the journal portion of the work roll 1 is bent and deflected due to the bender load, this effect on the roll bearing can be eliminated by dividing the roll bearing box into an inner bearing box 5 and an outer bearing box 6 in the axial direction. I can do it.

In addition, by connecting the centers of the outer peripheral surfaces of each bearing box 5 and 6 with a link plate 7, in addition to considering the bearing box against four-wheel deflection as described above, when handling the bearing box, it is possible to It can be handled as an integrated unit in the same way as a bearing box.

〔Effect of the invention〕

According to the present invention, it is possible to apply a large bending force to the roll bearing within the limit of the diameter of the work roll, and this has the effect of expanding the shape control range of the rolling mill by the bending force. According to the embodiment of the present invention described above, it is possible to improve the shape control according to the purpose, simplify the roll polishing work by eliminating or simplifying the initial crank of the roll, and improve the bearing accuracy by linking the divided bearing boxes. By connecting them with plates, they can be handled in the roll shop in the same way as an integral bearing box, and have good rolling workability, making it possible to roll economically and with high quality. We can provide rolling mills.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a work roll bearing box according to an embodiment of the present invention, and FIG. 2 is a side view of the roll bearing box shown in FIG. 1. 1... Work roll, 2... A10-ru bearing, 3...
-20-hole bearing, 4...30-hole bearing, -inner bearing box, 6...outer bearing box, 7...link plate, 8...inner bearing box liner, 9. ... Outer bearing box liner, 10... Bender block, 11a to Ilc.
...Bender cylinder, 12a-12c...Bender cylinder also 1 Figure also 2 z

Claims (1)

[Scope of Claims] 1. In a roll bearing box of a rolling mill that is attached to a work roll of a multi-high rolling mill and configured to be able to apply a pender force, the work roll body serves as the bearing box of the work roll. an inner bearing box with a bearing that bears the radial load, which is installed on the side and whose bearing inner ring is held free against the roll; A roll bearing box for a rolling mill, characterized in that it is divided into a fixed outer bearing box and an outer bearing box that is equipped with bearings that load thrust loads and radial loads. 2. A roll bearing box for a rolling mill according to claim 1, characterized in that a member for interconnecting the inner bearing box and the outer bearing box is provided so that the two bearing boxes are integrally constructed. .