JP2649292B2 - Rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill which is used in the steel industry and non-ferrous fields and passes a sheet material such as a steel sheet between rolls to perform a plastic deformation to a desired thickness. In particular, the present invention relates to a rolling mill provided with a shape correction and a crown correction means.

[0002]

2. Description of the Related Art Generally, various methods have been proposed for controlling the shape of a material to be rolled.
As shown in FIG. 14, the step rolling mill includes a pair of work rolls 1 and 2 having a relatively small diameter and backup rolls 3 and 4 having a relatively large diameter arranged to sandwich the work rolls 1 and 2 from outside. Are formed to have substantially the same body length so that they can be rolled over the entire length, and the bending cylinder 5 is mounted between the bearings of the work rolls 1 and 2. The material to be rolled 6 is passed through such a rolling mill to obtain a strip material having a desired thickness. However, as the material to be rolled 6 passes, the central portions of the work rolls 1 and 2 are expanded, and Since the material to be rolled 6 has a so-called middle-high cross-sectional shape in which the center portion is thick and both side edges are thin, the neck of the work rolls 1 and 2 is driven by the bending cylinder 5 in the enlargement direction so that the work is enlarged. The pressing surfaces of the rolls 1 and 2 are adjusted so as to be flat.
The shape is controlled so as to correct the crown generated in the image.

However, the above-mentioned four-high rolling mill has a limit in the shape control function, and it cannot be said that the four-high rolling mill is particularly effective in preventing edge drop in which the thickness of the side edge portion of the material to be rolled 6 is reduced. . For this reason, in order to enhance the shape control and crown control effects, a six-high rolling mill has been proposed and actually used (JP-A-47-29260). As shown in FIG. 15, intermediate rolls 7 and 8 are arranged between work rolls 1 and 2 and backup rolls 3 and 4,
The distribution of the rolling force is adjusted by shifting the intermediate rolls 7 and 8 in the axial direction, thereby improving the shape correcting function. In addition, a technique has been proposed in which adjusting the roll bending force and the shift amount of the intermediate rolls 7 and 8 is particularly effective in preventing edge drop (Japanese Patent Publication No. 56-14362).

[0004]

However, in the above-mentioned conventional rolling mill, the work rolls 1 and 2 and the intermediate rolls 7 and 8 are not used.
Is restricted on the entire surface of the backup rolls 3 and 4, it is difficult to give sufficient roll bending to the work rolls, and not only is the absolute capability of shape control lacking, but also, particularly in a four-high rolling mill, There is a drawback that it is necessary to change the crown shape by changing the backup roll depending on the plate width, strength, shape, etc. Further, in the conventional six-high rolling mill, since the shift direction by the intermediate roll is limited to one direction, even if crown control is performed, undulation along the sheet width direction of the material to be rolled may occur.
It cannot be said that a sufficient shape control function can be obtained. In addition, since the backup roll that comes into contact with the work roll and the intermediate roll comes into full contact, the backup fulcrum cannot be changed arbitrarily and shape control at an arbitrary position cannot be performed. In addition, it is necessary to polish the entire surface also in the maintenance of the backup roll, and there are drawbacks such as difficulty in maintenance and a sufficient space space beside the rolling mill due to a shift mechanism of the intermediate roll.

An object of the present invention is to pay attention to the above-mentioned conventional problems, and particularly to have a responsiveness capable of coping with conditions that change every moment in high-speed rolling, and in particular to greatly increase the amount of work roll bending control. Accordingly, it is an object of the present invention to provide a rolling mill capable of improving shape control ability, having a large effect of reducing edge drop, and performing shape control of a material to be rolled at an arbitrary position in a sheet width direction.

[0006]

In order to achieve the above object, a rolling mill according to the present invention comprises a pair of work rolls through which a material to be rolled is passed, and a roll bending which is interposed between neck portions of the work rolls. The intermediate roll provided with at least one work roll is provided, and a pair of support rolls attached to a large-diameter backup shaft arranged in parallel with the intermediate roll are provided on the intermediate roll. It is configured to be axially movable while being rolled.

[0007]

According to the above construction, the function of each backup roll for suppressing the deflection of the work roll which directly lowers the material to be rolled is a pair of support rolls which are rolled and contacted with the intermediate roll and separated in the roll axis direction. Demonstrated by the attached backup shaft, it supports the work roll rolling force. These separation support rolls can be moved in the axial direction, and the position of the separation support rolls is changed to change the fulcrum of the bending moment, thereby adjusting the amount of roll bending by the bending means provided on the work roll neck or the intermediate roll neck. be able to. Therefore, the overall amount of bending is controlled by the position movement of the support roll, and the shape of the crown of the material to be rolled can be controlled, and the fulcrum of the bending moment can be arbitrarily changed. improves.

On the other hand, the length of the intermediate roll can be set shorter than the length of the work roll for the edge drop generated on the material to be rolled. With this configuration, it is possible to easily control by adjusting the pressing force by the work roll bending means. That is, the edge drop is caused by the fact that the end of the work roll suddenly comes out of contact with the side edge of the material to be rolled, and the curvature of the roll end becomes large. Therefore, the operation may be performed so that only the ends of the work rolls are separated from each other. In the present invention, by making the length of the intermediate roll that is in contact with the work roll shorter than that of the work roll, the contact point at the edge of the intermediate roll acts as a bending fulcrum at the end of the work roll. Therefore, by adjusting the pressing force by the bending means, it is possible to adjust the direction in which sharp bending of only the end of the work roll is suppressed, thereby reducing the edge drop of the material to be rolled.

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 to the guide rod. What is necessary is just to make it move. The pair of guide members may be simultaneously driven in the direction of approaching or separating in accordance with the width of the material to be rolled, but may be individually and independently moved. As a driving method, a suitable method such as a method using a screw rod or a method using a hydraulic cylinder can be adopted.

The bending means can be interposed not only between the work rolls but also between the intermediate rolls. In this case, the overall shape control of the material to be rolled can be performed mainly by adjusting the bending amount of the intermediate roll, and the edge drop can be mainly performed by adjusting the bending amount of the work roll.

Further, it is desirable that the mechanism portions of the intermediate roll and the support roll are provided symmetrically with respect to each of the upper and lower work rolls. However, it is also possible to provide a mechanism for only one of the work rolls. Only the support roll mechanism can be provided symmetrically, and the support roll mechanism can be provided on one side. In this case, substantially the same operation as in the case of the completely symmetric configuration can be exhibited. Further, by providing the intermediate roll, the diameter of the work roll can be further reduced, and thereby, high-pressure rolling can be performed while reducing the rolling load.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rolling mill according to the present invention.

FIGS. 1 and 2 show the overall configuration of a rolling mill according to an embodiment. As shown, a portal housing 20 is shown.
A pair of upper and lower work rolls 21 and 22 that are parallel to each other are horizontally traversed so as to be able to roll and contact each other, and a material 23 to be rolled can be passed between them. Such upper and lower work rolls 21,
A pair of intermediate rolls 24 and 26 which are rolled and rolled so as to be sandwiched from above and below in parallel with the
Is laid down. The intermediate rolls 24 and 26 are formed to have a diameter larger than the diameter of the work rolls 21 and 22 to transmit the rolling force.
And is set to be shorter than the body length of the work rolls 21 and 22. Therefore, in a state where the intermediate rolls 24 and 26 are incorporated in the housing 20,
Are in full contact with the work rolls 21 and 22, but are set so that the ends of the work rolls 21 and 22 protrude from the ends of the intermediate rolls 24 and 26 by a predetermined length L as shown in FIG. It has become something.

Further, in addition to such a roll row, an upper backup roll unit 28 and a lower backup roll unit 30 are also horizontally laid on the upper and lower positions so as to sandwich the intermediate rolls 24 and 26.

The upper backup roll unit 28 includes a backup shaft 3 disposed in parallel with the intermediate roll 24.
2, a pair of support rolls 34R, 34L, which are separated to the left and right in the roll axis direction and have a body length shorter than the width of the material 23 to be rolled, can rotate and slide in the axial direction. Mounted on The pair of support rolls 34R and 34L are rolled and contacted with the upper intermediate roll 24, and serve as a backup support for the work roll 21 and the intermediate roll 24 during rolling. Similarly, the lower backup roll unit 30 also has a backup shaft 36 and support rolls 38R and 38L separated into a pair of right and left mounted on the backup shaft 36. We are trying to provide backup support. The support rolls 34R, 34L, 38R, 38L are mounted on the backup shaft 32 via rotary bearings 40 as shown in FIG. 3 for the upper unit 28, and have thrust bearings 42 on both end surfaces. 44 are provided and mounted.

As shown in FIG. 2, bearings 46 are provided at the neck portions of the upper and lower work rolls 21 and 22 and the intermediate rolls 24 and 26 and at the neck portions of the backup shafts 32 and 36 of the upper and lower backup roll units 28 and 30. , 47, 48, 49, 50, 52 are mounted, and they are mounted in cascade on the housing 20. The lower cylinder 54 is located at the lower position of the housing 20.
Is driven, and a predetermined rolling pressure is generated between the work rolls 21 and 22 by driving this.

In such a configuration, the separation support roll 34 of the upper backup roll unit 28 described above is used.
R, 34L, and lower backup roll unit 30
Each of the separation support rolls 38R and 38L can be adjusted in position by moving in the roll axis direction. For this position adjustment, each unit 28, 30
Support rolls 34R, 34L, 38R, 38 in
L is a roll guide 56R, 56L as a guide member.
Are engaged. FIG. 3 shows an example of attachment to the upper backup roll unit 28. As also shown in FIG.
Two guide shafts 58 extending between both end bearings 50 of the backup shaft 32 are attached in parallel with the backup shaft 32. The backup shaft 32 and the guide shaft 58 for the common bearing 50
By mounting the shaft, the parallelism between the shafts 32 and 58 is maintained. The roll guides 56R and 56L are attached to the guide shaft 58,
This has slide casings 60R and 60L formed so as to penetrate the guide shaft 58 and not interfere with the support rolls 34R and 34L. The support rolls 34 are provided on the slide casings 60R and 60L.
R, extending toward both end faces of 34L, and a roll 34R,
Thrust bearing support 6 for holding thrust bearings 42 and 44 attached to both end surfaces of 34L
2, 64 are attached. As shown in FIG. 4, each of the thrust bearing supports 62 and 64 is formed by a donut-shaped pressing plate 66 that directly contacts the thrust bearings 42 and 44, and a support 68 that reinforces and supports the pressing plate 66 from the outer surface. . The holding plate 66 is formed so as to penetrate the backup shaft 32 so as not to interfere with each other. Therefore, each of the support rolls 34R, 34L can slide in the axial direction of the backup shaft 32 as the roll guides 56R, 56L move in the axial direction along the guide shaft 58, respectively. Such a roll guide 56R, 5
6L is also engaged and mounted on the lower support rolls 38R and 38L.

The support rolls 34R, 34
Driving means for appropriately performing the position movement of L, 38R, 38L is provided for each backup roll unit 28, 30. This corresponds to a pair of separation support rolls 34R, 34L according to the width of the rolled material 26 and the plate shape.
The positions of (38R, 38L) are mutually shifted by the intermediate roll 24.
(26) It is made to approach and separate in the axial direction along the outer peripheral surface. The upper backup roll unit 28 will be described as a representative. As shown in FIGS. 3 and 4, a screw rod 70 rotatably supported by bearings 50 at both ends and located at an intermediate portion between a pair of guide shafts 58. And the left and right roll guides 56R, 56L
Are screwed through the slide casings 60R and 60L. In this embodiment, the coaxial support rolls 38R and 38L are simultaneously moved toward and away from each other. For this reason, the screw of the screw rod 70 is cut into a reverse screw across the center. Of course, the screw fitting portions of the slide casings 60 </ b> R and 60 </ b> L also have a female screw configuration adapted to the screw of the screw rod 70.
Therefore, by rotating the screw rod 70, the roll guides 56R, 56L screwed thereto are screwed.
Are moved toward and away from each other. A drive motor 72 for rotationally driving the screw rod 70 is attached to one bearing 50 of the backup shaft 32 so as to give a predetermined rotation to the screw rod 70.

The structure of the screw rod 70 and the drive motor 72 is such that the lower backup roll unit 3
0 is similarly attached.

The housing 20 includes a work roll bending device 100 and an intermediate roll bending device 2.
00, which is shown in FIG.

First, the work roll bending device 10
0 denotes an upper roll bending rod 102, a lower roll bending rod 104, a roll bending cylinder block 106, and a piston 10
8. The lower end of the upper roll bending rod 102 is fixed to the piston 108, and the upper end is disposed so as to be able to freely contact and separate from the upper work roll bearing 46. On the other hand, the lower roll bending rod 104 has an upper end fixed to the piston 108 and a lower end freely movable toward and away from the lower work roll bearing 47. The piston 108 is provided in a bore 107 of the cylinder block 106.
The bore 107 is provided with a small-diameter communication hole 110 in the middle of both pistons 108. When pressure oil is introduced from a pressure oil supply device (not shown), the roll bending rods 102, 104 They act to push the bearings 46 and 47 of the upper and lower work rolls 21 and 22 against the bearings 48 and 49 of the intermediate rolls 24 and 26, respectively.

Similarly, the intermediate roll bending device 20
0 is the bore 1 relative to the cylinder block 106.
In addition, a bore 207 independent of the bore 07 is bored, and a pair of pistons 208 are slidably mounted on the bore 207. An upper roll bending rod 202 and a lower roll bending rod 204 are connected to each piston 208, and the tips of these rods 202, 204 are connected to the cylinder block 1.
06 so as to be able to contact the intermediate roll bearings 48 and 49. This bore portion 207 is also provided with a small-diameter communication hole 210 at the center, and pressure oil is introduced into the bore 207 from the pressure oil supply device to thereby form the roll bending rod 2.
Numerals 02 and 204 are separated from each other and act to press the bearings 48 and 49 of the intermediate rolls 24 and 26 against the bearings 50 and 52 of the upper and lower backup roll units 28 and 30, respectively.

Liners 112 and 114 are adhered to sliding surfaces of the roll bending cylinder block 106 and the upper and lower work roll bearings 46 and 47, respectively. The sliding is performed on the surface, so that the sliding resistance between the work roll bearings 46 and 47 and the cylinder block 106 is reduced.

As shown in FIG. 5, the press-down cylinder 54 has a built-in head 116, and the head 116 is raised by introducing pressurized oil into the press-down cylinder 54 from a pressurized oil supply device (not shown) during rolling. I try to make it. The operation of the head 116 pushes up the backup shaft bearing 52 of the lower backup roll unit 30, and the rolling force is reduced by the lower support rolls 38R and 38L, the lower intermediate roll 26, the lower work roll 22, the upper work roll 21, the upper intermediate roll 24, Upper support roll 34
R, 34L, the upper backup shaft bearing 50, and the housing 20 to generate a desired rolling force.

The operation 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. In this case, the support rolls 34, 3
8 is in contact with the work rolls 21 and 22 at the rolled material 2
The position is set so as to overlap the side portion of No. 6. This initial setting uses roll bending rods 102 and 202 and a roll balancing cylinder (not shown).
The work rolls 21 and 22, the intermediate rolls 24 and 26, and the support rolls 34 and 38 are lightly contacted. After that, the position adjusting motor 72 of the support rolls 34 and 38 is driven to move to the preset position. Thereby, a pair of support rolls 34R, 34L,
And 38R, 38L are set to desired intervals.

After the completion of the initial setting, the material 23 to be rolled is passed between the work rolls 21 and 22. As a result, the material 23 to be rolled is rolled to a desired thickness and comes out as a strip material. The shape is determined visually or by a contact method using a sensor roll, or a non-contact method using light or magnetism. If the ear extension or middle extension occurs by this determination, the drive motor 72 is operated to move the paired support rolls 34R, 34L and 38R, 38L so that they are close to each other or separated from each other. By doing so, the amount of bending moment acting on the work rolls 21 and 22 through the intermediate rolls 24 and 26 is adjusted, the occurrence of shape abnormality is suppressed, and a rectangular strip material can be obtained. At this time, the intermediate roll bending device 200
The bending amount of the intermediate rolls 24 and 26 is controlled by adjusting the bending force by
By interacting with the amount of position movement of the support rolls 34R, 34L and 38R, 38L, a large shape correcting function can be exhibited. That is, support roll 3
The correction area can be adjusted by moving the position of 4R, 34L and 38R, 38L, and the correction amount can be adjusted by the intermediate roll bending device 200.

If an edge drop has occurred in the material 23 to be rolled, the work roll bending device 10
0 controls the bending force of the work rolls 21 and 22. Work rolls 21 and 22 are intermediate rolls 24 and 2
6 project from both ends, so that the bending device 10
By supplying pressure oil to the rods 102, 104
Projecting from the edges of the intermediate rolls 24 and 26 are largely bent mainly, and act to suppress edge drop. Of course work rolls 21 and 22
, The bending force is transmitted to the intermediate rolls 24 and 26.

According to the rolling mill of this embodiment, the bending fulcrum of the work rolls 21 and 22 or the intermediate rolls 24 and 26 can be changed freely, so that the rolling roll is not restricted by the conventional full-contact backup roll. The roll bending effect can be sufficiently exhibited. In addition, upper and lower support rolls 34R, 34L and 38R,
Since the position of 38L can be individually changed, shape control at an arbitrary position in the plate width direction becomes possible. Therefore, there is an advantage that it is possible to control not only the shape defect such as the medium elongation and the ear elongation of the material to be rolled but also the shape defect of the composite elongation obtained by combining them.

Further, the work roll bending device 10
0 and the intermediate roll bending device 200, the full width shape control of the plate can be performed by the intermediate roll bending, and the shape control of the edge of the plate such as the edge drop can be performed by the work roll bending. Very easy. In addition, the support rolls 34R, 3
Since the positions of 4L and 38R, 38L can be symmetrically controlled in the vertical and horizontal directions, the shape control can be symmetrically controlled in the sheet thickness direction and the sheet width direction of the material 23 to be rolled, and a highly accurate rolled product can be obtained. be able to.

In addition, since the positions of the support rolls 34R, 34L and 38R, 38L can be freely adjusted according to the plate width, the contact surfaces between the work rolls 21, 22 and the plate width ends can be made smoother in combination with roll bending. And the effect of preventing edge drop is high. In addition, since the intermediate rolls 24 and 26 are provided, the diameter of the work rolls 21 and 22 can be reduced, so that the rolling load area can be reduced and high-pressure rolling can be performed. Roll flat deformation can be reduced. Furthermore, since the configuration is such that the sheet thickness and the sheet width direction are symmetrically controlled, the rolled material 23 does not meander at the time of sheet passing, and there is an effect that stable sheet passing characteristics can be obtained.

FIGS. 7 and 8 show the upper and lower work rolls 2 when the rolled material 23 is rolled using the rolling mill according to the above embodiment.
An experimental result showing how the profiles Nos. 1 and 22 change depending on the magnitude of the bending force is shown.

FIG. 7 shows a change in the profile of the upper work roll 21 when the work roll diameter is set to 600 mm, the rolling force is set to 400 tons, the distance between the support rolls is set to 1300 mm, and the roll bending force is adjusted from 0 to 125 tons.

FIG. 8 shows a work roll diameter of 600 mm.
Rolling force 600ton, distance between support rolls 1100
mm and the roll bending force is 0 to 125 to
7 shows a change in the profile of the upper work roll 21 when the adjustment is made up to n.

As can be understood from the results, it can be seen that the bending amount of the work roll can be arbitrarily changed depending on the roll bending force and the position of the support roll, and that the cross section of the strip material can be adjusted. Therefore, it is possible to provide shape control and crown control capabilities over a wide range.

Next, FIG. 9 shows a front view of a rolling mill according to a second embodiment. This differs from the first embodiment only in that the diameter of the intermediate rolls 24B and 26B is smaller than the diameter of the work rolls 21B and 22B, and the bending device is attached only to the work rolls 21B and 22B.

According to the second embodiment, the shape control is performed by moving the positions of the support rolls 34R, 34L and 38R, 38L and the work roll bending, and the edge drop control is performed only by the work roll bending. Although the intermediate roll bending is not performed, since the intermediate rolls 24B and 26B have a small diameter, the work roll bending also bends the intermediate rolls 24B and 26B to sufficiently exert the shape correcting action. Can be. In this embodiment, the same applies to the first embodiment, but the roll marks of the support rolls 34R, 34L and 38R, 38L are prevented from being transferred to the material 23 to be rolled, and the product accuracy is improved.

Next, FIG. 10 shows a front view of a rolling mill according to a third embodiment. In the rolling mill of the third embodiment, the lower intermediate roll 26 and the lower backup roll unit 30 of the first embodiment are omitted, and a conventional full-contact backup roll 80 is rolled on the lower work roll 22. Things. Then, a bending device is incorporated between the upper intermediate roll 24 and the lower backup roll 80 together with the work roll bending device. Other configurations are the same as in the first embodiment.

In the third embodiment as well, although there are no support rolls 38R and 38L at the lower part, the correction function at the upper side can be exhibited to cope with shape correction and edge drop. In particular, this embodiment is effective for partially improving and providing a shape control function when a space can be taken above the existing four-high rolling mill. Therefore, since the existing rolling mill can be used, there is obtained an advantage that the load on the equipment can be reduced and the product accuracy can be improved.

FIG. 11 is a front view of a rolling mill according to the fourth embodiment. In this embodiment, the lower intermediate roll 26B and the lower backup roll unit 30 in the second embodiment are omitted, and the conventional full-contact backup roll 80 is transferred to the lower work roll 22B.
Further, the configuration is such that only the work roll bending device is incorporated. Other configurations are the same as those of the second embodiment. Also in the fourth embodiment, the controllability can be improved while utilizing the existing equipment, as in the third embodiment.

Next, FIG. 12 shows a rolling mill according to a fifth embodiment. This also omits the backup roll 80 in the fourth embodiment shown in FIG.
The roll mechanism including the lower work roll 22C having the same diameter as that of the fourth embodiment and including the upper work roll 21B is the same as that of the fourth embodiment. The bending device is provided between the work rolls 21B and 22C to apply a bending force to the work rolls.

According to the fifth embodiment, since the work roll diameter is larger than that of any of the above embodiments, it is suitable for applications such as a skin pass mill for stainless steel in which gloss is important under low pressure.

FIG. 13 is a partial sectional view of a rolling mill according to the sixth embodiment. This is an example of the fifth embodiment, in which the backup roll 80 in the third embodiment shown in FIG. 10 is omitted, a lower work roll 22C having the same diameter as the backup roll 80 is provided, and an upper work roll 21 is included. The roll mechanism is the same as that of the third embodiment. The bending device 300 is a work roll 2
1 and 22C and between the lower work roll 22C and the upper intermediate roll 24 to apply a bending force to the upper work roll 21 and the upper intermediate roll 24.

It is needless to say that such an embodiment also provides the same operation and effect as the fifth embodiment.

In each of the above embodiments, the coaxial support rolls 34R, 34L or 38R, 38L are configured to move at the same distance from the rolling center by the reverse screw screw rod 70. The support roll can be configured to move independently. In this configuration, a pair of screw rods that are independently driven to rotate are passed through coaxial support rolls 34R, 34L (or 38R, 38L), and each screw rod is independently screwed to the left and right support rolls. Easily accomplished by: With this configuration, since the support rolls 34R, 34L and 38R, 38L can be moved independently of each other, the controllability is further improved.

In each of the above embodiments, only the increase bending device is mounted for roll bending, but a conventional decrease bending device can be mounted if necessary.

[0046]

As described above, the rolling mill according to the present invention comprises a pair of work rolls through which a material to be rolled is passed, and a bending means interposed in the neck portion of the work roll to provide roll bending. Provided is an intermediate roll that is rolled and contacted with at least one work roll and has a body length shorter than the work roll length, and is mounted on a large-diameter backup shaft arranged in parallel with the intermediate roll to provide the rolled material. With a configuration in which a pair of support rolls having a body length smaller than the plate width are mounted so as to be axially movable while being in rolling contact with the intermediate rolls, it has a responsiveness that can respond to conditions that change every time, particularly in high-speed rolling,
In particular, the amount of bending control of the work roll can be greatly increased, thereby improving the shape control ability, greatly reducing the edge drop, and controlling the shape of the material to be rolled at any position in the sheet width direction. The excellent effect that it can be obtained is obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a rolling mill according to a first embodiment.

FIG. 2 is a side view of the rolling mill.

FIG. 3 is an enlarged sectional view of a main part of an upper support roll portion of the rolling mill.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a cross-sectional view of a housing on which the bearing of the rolling mill is mounted.

FIG. 6 is a sectional view of a roll bending device of the rolling mill.

FIG. 7 is a change characteristic diagram in which a relationship between a roll bending force and a bending amount by the rolling mill is obtained by an experiment.

FIG. 8 is a change characteristic diagram obtained by changing a relationship between a roll bending force and a bending amount by the rolling mill by changing a rolling force and a support roll span.

FIG. 9 is a front view of a rolling mill according to a second embodiment.

FIG. 10 is a front view of a rolling mill according to a third embodiment.

FIG. 11 is a front view of a rolling mill according to a fourth embodiment.

FIG. 12 is a front view of a rolling mill according to a fifth embodiment.

FIG. 13 is a sectional view of a housing in which a bearing of a rolling mill according to a sixth embodiment is mounted.

FIG. 14 is a schematic view of a conventional four-high rolling mill.

FIG. 15 is a schematic view of a conventional 6-high rolling mill.

[Explanation of symbols]

Reference Signs List 20 housing 21, 22 work roll 24, 26 intermediate roll 23 material to be rolled 28, 30 backup roll unit 32, 36 backup shaft 34R, 34L, 38R, 38L support roll 40 rotary bearing 42, 44 thrust bearing 46, 47, 48, 49, 50, 52 Bearing 54 Roll-down cylinder 56R, 56L Roll guide 58 Guide shaft 60 Slide casing 70 Screw rod 72 Drive motor 100 Work roll bending device 200 Intermediate roll bending device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B21B 37/38 B21B 37/00 118

Claims (1)

(57) [Claims] 1. An intermediate roll which is provided with a pair of work rolls through which a material to be rolled is passed and a bending means interposed between neck portions of the work rolls to provide roll bending, and which is rolled and contacted with at least one work roll. And a pair of support rolls mounted on a large-diameter backup shaft arranged in parallel with the intermediate rolls so as to be axially movable while being in rolling contact with the intermediate rolls.