JPH06106214A - Backup roll device for rolling mill - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Change operation is easy and positioning of bending fulcrum is ensured. [Structure] A backup shaft 32 that is rotatably supported by a rolling mill housing, and a taper sleeve 1L that is mounted so as to be slidable in the axial direction on its outer circumference and has a taper portion on its outer peripheral surface.
A, 1LB, and support rolls 34R, 34L provided on the outer circumference of the taper sleeve and having the same taper surface as the taper sleeve and provided with a taper sleeve moving device on the inner wall surface. The support roll has a short body width that rolls into contact with the work roll or the intermediate roll, and the taper sleeve is moved by the taper sleeve moving device so that the support roll and the backup shaft can be fitted or loosely fitted by the wedge effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in the fields of iron and steel industry and non-ferrous metals, and is used in a rolling mill for passing a plate material such as a steel plate between rolls to perform plastic deformation to obtain a desired plate thickness. In particular, it relates to a device for backing up when performing roll bending for shape correction and crown correction.

[0002]

2. Description of the Related Art In general, various methods have been proposed in the past for controlling the shape of a material to be rolled.
The multi-stage rolling mill includes a pair of work rolls having a relatively small diameter and a backup roll having a relatively large diameter that is arranged so as to sandwich them from the outside. To be transferred to
A bending cylinder is installed between the bearings of the work roll.

The material to be rolled is passed through such a rolling mill to obtain a strip material having a desired plate thickness. As the material to be rolled passes, the central portion of the work roll is expanded and the strip after rolling is rolled. Since the material to be rolled has a so-called middle-height cross-sectional shape in which the central portion is thick and both side edges are thin, a crown is formed on the backup roll, and the bending cylinders are operated to cause the necks of the work rolls to expand in mutually directions. By driving it, the pressure lower surface of the work roll is adjusted to be flat, and shape control is performed to correct the crown generated in the material to be rolled.

[0004]

However, in the above-mentioned conventional rolling mill, since the work rolls and the intermediate rolls are constrained on the entire surface of the backup roll, it is difficult to give sufficient roll bending to the work rolls. In addition to lacking the absolute ability of shape control, there are drawbacks in that, especially in a 4-high rolling mill, the crown shape must be changed by changing the backup roll depending on the strip width, strength, shape, etc. of the material to be rolled. Further, since the backup roll rollingly contacted with the work roll and the intermediate roll comes into full contact, the backup fulcrum cannot be arbitrarily changed, and the shape cannot be controlled at an arbitrary position. Moreover, it is necessary to polish the entire surface of the backup roll in terms of maintenance, and there is a drawback that maintenance is difficult and a sufficient space space is required on the side of the rolling mill due to the shift mechanism of the intermediate roll.

It is an object of the present invention to pay attention to the above-mentioned conventional problems, and to have a quick response to the condition that is constantly changing in high speed rolling, and to greatly increase the work roll bending control amount. It is possible to quickly set the roll bending fulcrum to an arbitrary position in the plate width direction of the material to be rolled so as to have a good shape control function,
In particular, it is an object of the present invention to provide a backup roll device for a rolling mill, which can be easily changed and can reliably position the bending fulcrum.

[0006]

In order to achieve the above object, a backup roll device for a rolling mill according to the present invention comprises a backup shaft which is rotatably supported by a rolling mill housing, and axially slides on the outer periphery of the backup shaft. A pair of taper sleeves that are movably mounted and that have a tapered portion on the outer peripheral surface, and a pair of cylinders that have the same tapered inner surface on the outer peripheral surface of the taper sleeve and that are in rolling contact with a work roll or an intermediate roll. A support sleeve having a short width and a taper sleeve moving device that allows the support roller and the backup shaft to be fitted or loosely fitted by moving the taper sleeve so as to come into contact with and separate from each other are provided in the support roll. is there.

[0007]

According to the above construction, the function of each backup roll that suppresses the work roll bending that directly rolls down the material to be rolled is that the pair of support rolls that are rolled on the work roll or the intermediate roll and are separated in the roll axial direction. And it is demonstrated by the backup shaft wearing this,
Supports work roll rolling force. A pair of taper sleeves that are movable in the axial direction are arranged on the outer peripheral surfaces of these backup shafts. Further, the outer peripheral surface of the tapered sleeve is provided with a distribution support roll having the same tapered inner surface as the tapered sleeve having a taper directed inward in the axial direction.

The bending moment fulcrum is changed by moving the position of the separation support roll, and the amount of roll bending by the bending means provided on the work roll neck or the intermediate roll neck can be adjusted. Therefore, the overall amount of bending is controlled by the position movement of the support roll, the shape of the rolled material such as the crown can be controlled, and the bending moment fulcrum can be arbitrarily changed, so that the shape control ability is significantly improved. improves.

In particular, according to the present invention, a cylinder is disposed axially on the inner surface of the center of a support roll having a taper shape, and by operating this cylinder, a pair of taper sleeves are moved left and right to form a taper sleeve. The gap between the backup shaft and the backup shaft, and the gap between the taper sleeve and the separation support roll can be adjusted.Easy to move the support roll in the axial direction through the taper sleeve by fitting or loosely fitting each. And reliable positioning can be performed. In this case, regardless of the position of the support roll, a uniform fixed load is applied to the inner peripheral surface of the support roll, and the support roll can be stably held, whereby the bending fulcrum can be set reliably. it can.

Here, in order to move the position of the support roll, a guide rod is provided in parallel with the backup shaft, and a bracket-shaped guide member for holding each support roll is attached thereto so as not to interfere with the backup shaft. In advance, these guide members may be moved. The pair of guide members may be simultaneously driven in a direction of moving closer to or away from each other depending on the plate width of the material to be rolled, but they may be moved independently. As a driving method, a screw rod method, a hydraulic cylinder method, or the like can be appropriately used.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of a backup roll device for a rolling mill according to the present invention will be described in detail below with reference to the drawings.

4 to 5 show the overall construction of a rolling mill equipped with a backup roll device according to the embodiment. In this rolling mill, as shown in the figure, a pair of upper and lower work rolls 21 and 22 parallel to a gate-shaped housing 20 are horizontally mounted so as to be capable of rolling contact with each other, and a rolled material 23 can be passed between them. I have to. Such upper and lower work rolls 21, 22
A pair of intermediate rolls 24 and 26 that are rolled and contacted in parallel with each other so as to sandwich them from above and below are horizontally mounted on the housing 20. Intermediate rolls 24 and 26 are work rolls 2.
It is formed to have a diameter larger than the diameters of 1 and 22 to transmit a rolling force, but in particular, the cylinder length is set to be equal to or more than the plate width of the material 23 to be rolled and the cylinder length of the work rolls 21 and 22. It is set to be shorter. Therefore, while the intermediate rolls 24 and 26 are in full contact with the work rolls 21 and 22 in the state of being assembled in the housing 20, the end portions of the work rolls 21 and 22 have the intermediate rolls 24 and 26 as shown in FIG. It is set so as to protrude from the end of 26 by a predetermined length.

In addition to such a row of rolls, an upper backup roll device 28 and a lower backup roll device 30 are also laid in parallel at the upper and lower positions of the intermediate rolls 24 and 26 so as to sandwich them.

The upper backup roll device 28 has a backup shaft 32 arranged in parallel with the intermediate roll 24, which is divided into right and left in the axial direction of the roll and has a body length shorter than the plate width of the material 23 to be rolled. The pair of support rolls 34R and 34L are attached so as to be slidably movable in the axial direction. This pair of support rolls 34R,
34L is rollingly contacted with the upper intermediate roll 24 and serves as a backup support for the work roll 21 and the intermediate roll 24 during rolling. Similarly, the lower backup roll device 30 also includes a backup shaft 36 and left and right support rolls 38R that are mounted on the backup shaft 36 and are separated into a pair.
8L, and these rolls are brought into rolling contact with the lower intermediate roll 26 to provide a backup support during rolling.

The neck portions of the upper and lower work rolls 21 and 22 and the intermediate rolls 24 and 26, and the backup shaft 3 of the upper and lower backup roll devices 28 and 30.
As shown in FIG. 5, bearings 4 and
6, 47, 48, 49, 50, 52 are mounted and mounted in the housing 20 in tandem. A reduction cylinder 54 is provided at a lower position of the housing 20, and a predetermined rolling pressure is generated between the work rolls 21 and 22 by driving the reduction cylinder 54.

In such a rolling mill, the specific construction of the backup roll devices 28 and 30 according to this embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a partially cut front view of the upper backup roll device, and FIG. 2 is A-A of FIG.
FIG. 3 is a cut side view, and FIG. 3 is an enlarged cross-sectional view of a main part of the upper backup roll unit. Figure 1 shows the upper backup roll device 2
8 shows the separating support roll 3 of this device 28.
4R and 34L are connected to the taper sleeves 1R and 1L via the rods 3 of the plurality of cylinders 2 attached to the taper sleeves 1R and 1L, so that the taper sleeves 1R and
Backup shaft 32 by moving 1L
The position can be adjusted by slidingly moving in the axial direction. Due to this position movement, the taper sleeves 1R and 1L have a roll guide 56 as a driving member.
R and 56L are engaged.

Both end bearings 50 of the backup shaft 32
Two parallel guide shafts 58, which are bridged in between, are mounted parallel to the backup shaft 32.
By attaching the backup shaft 32 and the guide shaft 58 to the common bearing 50, both shafts 3
A parallelism of 2,58 is retained. The roll guides 56R and 56L are attached to the guide shaft 58. The roll guides 56R and 56L penetrate the guide shaft 58, and the taper sleeves 1R and 1L and the support rolls 34R,
The slide casings 60R and 60L are formed so as not to interfere with the 34L. Further, the slide casings 60R and 60L are provided with a pair of taper sleeves 1R and 1L extending toward both end faces, and a pair of taper sleeves 1R and 1L are provided so as to straddle the both end faces, and contact the end faces of the taper sleeves 1R and 1L. Possible supports 62, 64 are attached. Each of the supports 62 and 64 is formed in a bifurcated manner so as not to interfere with the backup shaft 32, and moves the slide casings 60R and 60L to press the end faces of the taper sleeves 1R and 1L, thereby axially supporting the rolls 34R and 34L. Can be moved. Such a configuration is similar in the lower backup roll device 30.

Here, the support rolls 34R, 34R
A drive unit for properly moving the positions of L, 38R, and 38L is provided for each backup roll device 28, 30. This is a pair of separation support rolls 34R, 34L (38, depending on the width dimension of the rolled material 23 and the plate shape.
R, 38L) to the intermediate roll 24 (26)
Along the outer peripheral surface of the shaft in the axial direction. The upper backup roll device 28 will be described as a representative. As shown in FIG. 2, a pair of screw rods 70 </ b> R rotatably supported by the bearings 50 at both ends and located at an intermediate portion of the pair of guide shafts 58. 70
The left and right roll guides 56R, 56L are threadedly engaged with the slide casings 60R, 60L, respectively. In this embodiment, one screw rod 70R is screwed into the right slide casing 60R, and the other screw rod 70L is screwed into the left slide casing 60L so that they can be individually moved in the axial direction. It has become. The drive motors 72R, 72L for rotating the screw rods 70R, 70L are attached to one bearing 50 of the backup shaft 32 to rotate the screw rods 7R, 72L at a predetermined rotation.
0R and 70L are given.

Of course, a single screw rod structure may be used, and the screw may be formed into a reverse screw with the central portion sandwiched therebetween so that the coaxial support rolls 38R and 38L are simultaneously moved toward or away from each other. In this case, the screw fitting portions of the slide casings 60R and 60L also have a reverse female screw structure adapted to the screw of the screw rod. Therefore,
By rotating the screw rod, the roll guides 56R and 56L screwed to the screw rod move toward each other or move away from each other.

Thus, the pair of taper sleeves 1R (1
RA, 1RB) and 1L (1LA, 1LB) are slidable along the backup shaft 32, but in order to allow them to move and to position them when they move to a predetermined position, Taper sleeve 1R (1R
A, 1RB) and 1L (1LA, 1LB) are provided with support rolls 34R and 34L on their outer peripheral portions as follows.

As shown in FIGS. 1 and 2, the backup shaft 32, the taper sleeves 1R and 1L, and the support rolls 34R and 34L are coaxially fitted and arranged. The outer peripheral surface of each of the taper sleeves 1R and 1L has a taper shape that is inclined from the center toward the outside. In addition, the inner surfaces of the support rolls 34R and 34L are
The support rolls 34R and 34L are tapered toward the outside, and the cylinder 2 is fixedly attached to the inner wall surface of the central portion. Cylinder rod 3 (3LA, 3LB, 3
RA, 3RB) and taper sleeves 1R, 1L are arranged, and rods 3 (3LA, 3LB, 3RA, 3
The taper sleeves 1R and 1L can move in the pushing side direction or the pulling side direction shown in FIG.

As the taper sleeves 1R and 1L move forward and backward, the backup shaft 32 and the taper sleeves 1R and 1L located on the outer peripheral surface of the backup shaft 32 are separated or fitted in a horizontal state. . Further, the taper sleeves 1R and 1L and the support rolls 34R and 34L located on the outer peripheral surfaces of the taper sleeves 1R and 1L are also separated or fitted in a state where both surfaces are horizontal. The inner diameters of the taper sleeves 1R and 1L are made slightly larger than the outer diameter of the backup shaft 32.
By moving R and 1L in the pulling side direction, the taper sleeves 1R and 1L are elastically deformed by the compressive force in the radial direction due to the wedge effect, and the taper sleeves 1R and 1L and the support rolls 34R and 34L which are pre-existing are retained. The gap becomes zero. Further, the taper sleeves 1R and 1L apply a compressive force to the backup shaft 32, and the taper sleeve 1 is caused by the frictional force generated by the compressive force.
R and 1L are fitted to the backup shaft 32.

At the same time, the support rolls 34R and 34L and the taper sleeves 1R and 1L are also fitted by the frictional force due to the wedge effect. That is, the cylinder rod 3 (3L
The support rolls 34R, 34L and the taper sleeves 1R, 1L can be fixed to the backup shaft 32 by operating (A, 3LB, 3RA, 3RB) in the pulling side direction. The magnitude of this frictional force can be adjusted by the number of sizes of the cylinder 2, the pressure of hydraulic oil, and the like. Conversely, the cylinder rod 3 (3LA, 3LB, 3R
A, 3RB) is operated in the push side direction, so that the support rolls 34R, 34L, the taper sleeves 1R, 1
The compressive force acting on L and the backup shaft 32 is released, and each part elastically returns to the original state with the gap. Reference numeral 85 indicates a rotary joint.

The above-described structure is similarly formed in the lower back roll roll device 30.

A work roll bending device 110 and an intermediate roll bending device 120 are incorporated in the rolling mill housing 20. The work roll bending apparatus 110 includes an upper roll bending rod 11
2. It has a lower roll bending rod 114, which can be brought into and out of contact with the upper work roll bearing 46 and the lower work roll bearing 47 so that the bending action is performed by hydraulic pressure. The intermediate roll bending device 120 includes the upper roll bending rod 12
2. A lower roll bending rod 124 is provided so that it can contact the intermediate roll bearings 48 and 49, respectively, so that the bending action can be performed independently.

In FIG. 5, reference numeral 54 is a reduction cylinder 5
4 and the head 130 is raised.
The operation of the head 130 is performed by the lower backup roll device 30.
The backup shaft bearing 52 of the above is pushed up, and this rolling down force is applied to the lower support rolls 38R and 38L, the lower intermediate roll 26, the lower work roll 22, the upper work roll 21,
Upper intermediate roll 24, upper support rolls 34R, 34
L, upper backup shaft bearing 50, housing 2
It is transmitted to zero to generate the desired rolling force.

The operation of the backup roll device of the rolling mill configured as described above is as follows.

Before rolling, the positions of the support rolls 34R, 34L and 38R, 38L are determined in advance according to the width of the material 23 to be rolled. Next, the cylinder rod 3 is moved in the pushing direction, the taper sleeves 1R, 1L are freed from the backup shafts 32, 36, the roll guides 56R, 56L are moved left and right by the drive motors 72R, 72L, and the support rolls 34R, 34L,
38R and 38L are moved to arbitrary positions on the backup shafts 32 and 36. After being moved to a predetermined position, the cylinder rod 3 is moved in the pulling side direction to immovably fix the taper sleeves 1R, 1L to the backup shaft 32, and the support rolls 34R,
34L is also fixed to the taper sleeves 1R and 1L. As a result, the space between the pair of upper and lower support rolls 34R, 34L and 38R, 38L is set to a desired space.

After the initialization is completed, the material 23 to be rolled is passed between the work rolls 21 and 22. As a result, the material to be rolled 23 is rolled to a desired plate thickness and emerges as a strip material. This shape determination is performed visually or by a contact method using a sensor roll or a non-contact method using light or magnetism. When the ear extension or the middle extension occurs due to this determination, the support rolls 34R, 34L and 38R, 38
Move L so that they come close to or away from each other,
Work rolls 21, 22 through intermediate rolls 24, 26
It is possible to obtain a rectangular strip material by adjusting the amount of bending moment that acts on, suppressing occurrence of abnormal shape. At this time, by adjusting the bending force of the intermediate roll bending device 120, the intermediate roll 2
Since the bending amounts of Nos. 4 and 26 are controlled, a large shape correction function can be exerted by the interaction with the positional movement amounts of the support rolls 34R, 34L and 38R, 38L. That is, the support rolls 34R, 3
The correction area can be adjusted by moving the positions of 4L, 38R, and 38L, and the correction amount can be adjusted by the intermediate roll bending device 120.

When the rolled material 23 has an edge drop, the work roll bending apparatus 11 is used.
The bending force of the work rolls 21 and 22 by 0 is controlled. Work rolls 21 and 22 are intermediate rolls 24 and 2.
Since both ends of the load roll 6 protrude from the work roll 6, the work roll bending device 110 is supplied with pressure oil so that the load 1
12, 114 protrude, and the protruding portions from the end edges of the intermediate rolls 24, 26 are mainly largely bent, and act to suppress edge drop. Of course, the work rolls 21 and 22 also have rigidity, so the intermediate rolls 24 and 2
The bending force is transmitted to 6.

According to the rolling mill equipped with the backup roll devices 28 and 30 of such an embodiment, the work roll 2
Since the bending fulcrums of 1, 22 or the intermediate rolls 24, 26 can be freely changed, the roll bending effect can be sufficiently exhibited without being restricted by the conventional full-contact backup roll. Further, since the positions of the upper and lower support rolls 34R, 34L and 38R, 38L can be individually changed, it is possible to control the shape at any position in the plate width direction. Therefore, in addition to shape defects such as medium elongation and edge elongation of the material to be rolled, it is possible to obtain an advantage that it is possible to control shape defects of composite elongation in which both are compounded.

In the above embodiment, the intermediate rolls 24, 2
The example applied to a 6-high rolling mill equipped with No. 6 is shown in FIG.
It can be applied to the backup roll of the four-high rolling mill shown in (1), and the work roll 21 as shown in (2) of FIG.
It is also applicable to those in which the diameter of 22 is larger than that of the intermediate rolls 24 and 26. Further, the same figure (3) and the same figure (4).
It can be applied to backup rolls of cluster rolling mills such as. Of course, although not shown, it is needless to say that the present invention can be applied to any rolling mill having other special structure such as a rolling mill provided with the backup roll device of the embodiment only on the upper portion.

In the above embodiment, the support rolls 34R, 34L and 3 are moved by moving the cylinder rod 3 forward and backward.
Although 8R and 38L are moved forward and backward with respect to the taper sleeves 1R and 1L, the invention is not limited to this, and the cylinder rod 3 and the support rolls 34R, 34L and 3 are not limited thereto.
A clevis or the like may be provided on 8R and 38L to act on the support rolls 34R and 34L and 38R and 38L by a cylinder force. Furthermore, although the pair of support rolls 34R, 34L and 38R, 38L are applied in the above-described embodiment, the present invention is not limited to this, and three or four support rolls 34R, 34L are equally distributed on the upper or lower part, respectively. You may set it up. Further, in the present embodiment, the taper sleeves 1R and 1L are configured to have the taper portions that are inclined outward, but they may be formed in a taper shape that is inclined inward. Further, in this embodiment, the intermediate roll bending and the work roll bending are used together, but only the work roll bending or the intermediate roll bending may be operated.

[0034]

As described above, the backup roll device of the rolling mill according to the present invention is mounted on the backup shaft which is rotatably supported by the rolling mill housing and slidably movable in the axial direction on the outer periphery of the backup shaft. And a pair of taper sleeves having a tapered portion on the outer peripheral surface, and a pair of short-width support rolls that have the same tapered inner surface on the outer peripheral surface of the taper sleeve and that are in rolling contact with a work roll or an intermediate roll. By providing a taper sleeve moving device in the support roll that allows the support roll and the backup shaft to be fitted or loosely fitted by moving the taper sleeve so that the support roll can be reliably positioned. The support roll can be moved easily in the axial direction. It is possible to 's. Moreover, regardless of the position of the support roll, a uniform fixed rolling load is applied to the inner peripheral surface of the support roll, and the support roll can be stably held, thereby reliably setting the bending fulcrum. .

[Brief description of drawings]

FIG. 1 is a sectional front view of a main part of a backup shaft device for a rolling mill according to an embodiment.

FIG. 2 is a side view taken along the line AA of FIG.

FIG. 3 is an enlarged sectional view of an essential part of an upper backup roll unit.

FIG. 4 is a front view of a rolling mill equipped with the backup roll device of the embodiment.

FIG. 5 is a side view of FIG.

FIG. 6 is an example of another rolling mill in which the backup roll device according to the embodiment can be mounted.

[Explanation of symbols]

 1RA, 1RB, 1LA, 1LB Tapered sleeve 2 Cylinder 3RA, 3RB, 3LA, 3LB Cylinder rod 20 Housing 21, 22 Work roll 24, 26 Intermediate roll 23 Rolled material 28, 30 Backup roll device 32, 36 Backup shaft 34R, 34L , 38R, 38L Support rolls 46, 47, 48, 49, 50, 52 Bearings 54 Reduction cylinders 56R, 56L Roll guides 58 Guide shafts 60R, 60L Slide casings 70R, 70L Screw rods 72R, 72L Drive motors 110 Work roll bending device 120 Intermediate roll bending device

Claims (1)

[Claims] 1. A backup shaft that is rotatably supported by a rolling mill housing, a pair of taper sleeves that are mounted so as to be slidable in the axial direction on the outer periphery of the backup shaft, and that have a taper portion on the outer peripheral surface, and the taper sleeve. A pair of support rolls with a short body width, which have the same taper inner surface as the taper sleeve and are in rolling contact with a work roll or an intermediate roll, and the taper sleeve are moved by contact and separation so that the support roll is backed up. A backup roll for a rolling mill, wherein a taper sleeve moving device that allows a shaft to be fitted or loosely fitted is provided in the support roll.