JPH06503U - Backup roll device for rolling mill - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a backup roll device that allows the backup fulcrum to be changed arbitrarily, and that the change operation is easy and the fulcrum positioning is reliable. [Structure] On a periphery of a backup shaft which is rotatably supported by a housing of a rolling mill, a pair of support rolls having a short body width, which are rotatable and slidably movable in an axial direction and are in rolling contact with an intermediate roll, are mounted. Further, the outer peripheral surface of the backup shaft and the inner peripheral surface of the separation support roll are arranged so that they can be loosely fitted.
Furthermore, the support roll can be moved to any position in the axial direction by a hydraulic cylinder installed in the backup shaft bearing, and a deep groove is formed in the frame of the connecting portion provided on the outer side surface of the hydraulic cylinder and the support roll. Allocate type ball bearings.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is used in the field of iron and steel and non-ferrous metals, and is used in a rolling mill for forming a desired plate thickness by passing a plate material such as a steel plate between rolls to perform plastic deformation. The present invention relates to a device for making a backup when performing roll bending.

[0002]

[Prior art]

 Generally, various methods have been proposed to control the shape of the material to be rolled. For example, in a four-high rolling mill, a pair of work rolls having a relatively small diameter are sandwiched from the outside. It is equipped with a backup roll with a relatively large diameter, both of which are formed to have approximately the same cylinder length so that they can roll over the entire length, and a bending cylinder is installed between the bearings of the work rolls. .

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, Since the material to be rolled has a so-called middle-high cross-sectional shape with a thick central part and thin side edges, a crown is formed on the backup roll and the bending cylinders act to expand the necks of the work rolls mutually. The work roll is adjusted in such a way that the pressure lower surface of the work roll becomes flat, and shape control is performed to correct the crown generated in the rolled material.

[0004]

[Problems to be solved by the device]

 However, in the above conventional rolling mill, since the work rolls and intermediate rolls are constrained on the entire surface of the back-up rolls, it is difficult to give sufficient roll bending to the work rolls, and absolute shape control capability is lacking. Not only that, but especially in a four-high rolling mill, there is a drawback in that it is necessary to change the crown shape by changing the backup roll depending on the strip width, strength and shape of the material to be rolled. In addition, since the backup roll rolling on the work roll and the intermediate roll comes into full contact, the backup fulcrum cannot be changed arbitrarily and the shape cannot be controlled at any position. In addition, it is necessary to polish the entire surface of the backup roll in terms of maintenance, and there are drawbacks that maintenance is difficult and sufficient space is required on the side of the rolling mill due to the shift mechanism of the intermediate roll.

As a method for solving such a drawback, the following configuration is adopted. That is, the back-up roll device has a backup shaft that is arranged in parallel with the work roll, and it has a pair of supports that are separated left and right in the roll axial direction and that have a cylinder length shorter than the strip width of the material to be rolled. The roll is mounted so that it can slide axially. The pair of support rolls rolls on the work rolls and serves as a backup support for the work rolls during rolling. Similarly, the lower backup roll device also has a backup shaft and a pair of left and right support rolls that are mounted on the backup shaft, and provides back-up support during rolling so that these rolls are rotatably contacted with the lower work roll. I am trying. The support roll is mounted on the backup shaft via a rotary bearing using rollers or rollers, and thrust bearings are arranged on both end faces.

In such a rolling mill, although there is an advantage that the roll bending effect can be sufficiently exerted without being restricted by the conventional full-contact backup roll, the pair of support rolls are moved to the inner side. In such a case, since thrust bearings are provided on both end faces of each support roll, the pair of support rolls cannot be brought closer by the thrust bearings provided on the inner side faces of each support roll. For this reason, the roll bending effect cannot be fully exerted on the narrow material to be rolled. Since the thrust bearings are installed on both end faces of the pair of support rolls, the width of the support rolls cannot be made long. Therefore, the Hertzian stress between the intermediate roll or the work roll and the support roll becomes high, which causes problems such as damage to the surface of the support roll and shortening of the roll life. The outer diameter of the backup roll becomes large because of restrictions in manufacturing the rotary bearing. It is difficult to disassemble and assemble the rotating bearing that has been fully manufactured. It is difficult to control the clearance between the inner diameter of the rotating bearing and the backup shaft. If the backup shaft thermally expands due to thermal expansion, the support roll may not be able to move horizontally. If the work roll bends during rolling, the backup shaft also bends, which may cause the rotary bearing to seize. Such drawbacks still remain.

[0007] The purpose of the present invention is to pay attention to the above-mentioned conventional problems, in particular, to have a quick response to the condition that changes momentarily in high-speed rolling, and to greatly increase the bending control amount especially for work rolls or intermediate rolls. The rolling mill support can improve the shape control ability, reduce the edge drop effect, and control the shape of the rolled material at any position in the strip width direction. To provide a roll device.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the backup roll device of the rolling mill according to the present invention rolls a pair of work rolls that roll down the rolled material, a pair of intermediate rolls that roll to each work roll, and further rolls to an intermediate roll. It is equipped with a backup roll and both end bearings of each roll are attached to the housing, and the pressurizing means for crown control by adjusting the bearing interval between the pair of work rolls and the intermediate roll is installed in the housing. In this rolling mill, each of the backup rolls is formed by a pair of separation support rolls with a short cylinder width separated in the roll axial direction, and the separation support rolls are rotatably supported and axially slidably supported. Backup shaft, which supports the backup shaft by the housing, and separates and supports it. And the outer circumference of the backup shaft and the inner circumference of the separated support roll are loosely fitted to each other. The hydraulic cylinder installed in the backup shaft bearing and the outer side surface of the support roll are installed. A deep groove ball bearing is arranged in the frame of the connecting part.

[0009]

[Action]

 According to the above configuration, the function of each back-up roll, which suppresses the work roll deflection that directly rolls down the material to be rolled, is to install the pair of support rolls that are rolled on the work roll and separated in the roll axial direction. It is demonstrated by the backup shaft that is installed and supports the work roll rolling force. The pair of separate support rolls are individually movable in the axial direction, and the bending moment fulcrum is changed by moving the positions, and the amount of roll bending is adjusted by the bending means provided on the work roll neck. be able to. Therefore, the total amount of bendin can be controlled by the position movement of the support rolls, the shape of the rolled material such as the crown can be controlled, and the bending moment fulcrum can be changed arbitrarily. Is greatly improved.

Particularly, in the present invention, during rolling, due to the difference in frictional force between the sliding friction that directly slides between the outer peripheral surface of the backup shaft and the inner peripheral surface of the support roll and the rolling friction due to the rotary bearings at both ends of the backup shaft, Since the support roll rotates as a unit, no slip occurs on the inner surface of the support roll and the outer surface of the backup shaft. Also, since each roll is rotating during rolling (under load), the contact between the intermediate roll, the support roll and the backup shaft becomes frictional friction, and the support roll is supported by the hydraulic cylinder installed in the backup shaft bearing. Can be easily moved to any position in the axial direction of the backup shaft at high speed. In addition, during non-rolling (no load), the support roll can be moved at high speed in the axial direction of the backup shaft by using the gap between the support roll inner diameter and the backup shaft outer diameter. Further, since the backup shaft has a cylindrical structure, the structure is simple, the cross-sectional performance of the backup shaft can be increased, and the deflection of the shaft can be minimized. At any position, a uniform fixed load is applied to the inner peripheral surface of the support roll, and the sliding bearing makes surface contact with the backup shaft, so there is no risk of seizure even under high rolling loads. For this reason, the support roll can be stably held, and the bending fulcrum can be set reliably. Also, since the cross-sectional performance of the backup shaft is large, it is possible to give the backup sufficient supporting force and set a high rolling load.

[0011]

【Example】

 Hereinafter, a specific embodiment of a backup roll device for a rolling mill according to the present invention will be described in detail with reference to the drawings.

4 to 5 show the overall configuration of a rolling mill provided with a backup roll device according to the embodiment. As shown in the figure, this rolling mill has a pair of upper and lower work rolls 21 and 22 which are parallel to a gate-shaped housing 20 and are horizontally mounted so as to be capable of rolling contact with each other. It is possible. A pair of intermediate rolls 24 and 26 that are rolled in parallel with the upper and lower work rolls 21 and 22 and sandwich the upper and lower work rolls 21 and 22 from above and below are horizontally mounted on the housing 20. The intermediate rolls 24 and 26 are formed to have a diameter larger than that of the work rolls 21 and 22 so as to transmit a rolling force. Especially, the body length is set to be equal to or larger than the plate width of the material 23 to be rolled, and It is set to be shorter than the body length of the work rolls 21 and 22. Therefore, when the intermediate rolls 24 and 26 are in full contact with the work rolls 21 and 22 when assembled in the housing 20, the end portions of the work rolls 21 and 22 are, 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 roll row, an upper backup roll device 28 and a lower backup roll device 30 are also laid horizontally in parallel so that the intermediate rolls 24 and 26 are sandwiched between them. .

The upper backup roll device 28 has a back-up shaft 32 arranged in parallel with the intermediate roll 24, which is separated into right and left in the roll axial direction and has a body length shorter than the plate width of the material 23 to be rolled. The pair of formed support rolls 34R and 34L are attached so as to be slidably movable in the axial direction. The pair of support rolls 34R, 34L are rollingly 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 back-up roll device 30 also has a backup shaft 36 and a pair of left and right support rolls 38R and 38L attached to the backup shaft 36, which are rolled to the lower intermediate roll 26 during rolling. I am trying to make backup support.

Further, the support rolls 34R, 34L, 38R, 38L are inserted into the backup shaft 32 as shown as a representative of the upper back-up roll device 28 in FIG. 1, and then thrust bearings 42L, 42R are formed on the outer end surfaces thereof. The backup shaft 32 is attached to the bearing 50 via a roller bearing 81. On the outer peripheral surface of the backup shaft 32 and the inner peripheral surfaces of the support rolls 34R and 34L, in order to improve surface hardness, wear resistance, heat resistance, lubricity, etc., nitriding treatment, carburizing treatment or ceramic treatment is performed. One type of desired surface treatment can be performed from vapor deposition treatment and chemical densification treatment. The clearance between the outer diameter of the backup shaft 32 and the inner diameters of the support rolls 34R, 34L is such that the support rolls 34R, 34L can move horizontally even if the back shaft 32 is thermally expanded. As described above, the outer peripheral surface of the backup shaft 32 and the inner peripheral surfaces of the support rolls 34R, 34L are not limited to the surface treatment, but the outer peripheral surface of the backup shaft 32 or the support rolls 34R, 34L may be processed. Surface treatment may be applied to either of the inner peripheral surfaces.

As shown in FIG. 5, the neck portions of the upper and lower work rolls 21 and 22 and the intermediate rolls 24 and 26 and the neck portions of the backup shafts 32 and 36 of the upper and lower backup roll devices 28 and 30 are Bearings 46, 47, 48, 49, 50, 52 are mounted, and these are mounted in the housing 20 in tandem. Further, a rolling-down 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 rolling-down cylinder 54.

In such a rolling mill, a specific configuration of the backup roll devices 28 and 30 according to this embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 shows an upper backup roll device 28, and each of the separation support rolls 34R and 34L of this device 28 can be adjusted in position by slidingly moving in the roll axial direction. In order to move this position, the support rolls 34R, 34L are provided with hydraulic cylinders 81, 82 as drive members in the bearing 50 of the backup shaft 32. Further, the support rolls 34R, 34L are set so that the support rolls 34R, 34L do not tilt when moving due to the frictional force between the support rolls 34R, 34L in contact with the intermediate roll 24. By supplying and discharging oil, the thrust bearing support 62 (62L, 62R), which is the frame of the connecting portion between the hydraulic cylinders 81, 82 and the support roll 34, is pushed and pulled to move the support rolls 34R, 34L in the axial direction. Can be made.

Such a configuration is also the same in the lower backup roll device 30. Reference numeral 90 is a bellows, which is protected so that scales, foreign matters, rolling oil, etc. do not enter the slide portion. Further, the support rolls 34R, 34L, 38R, 38L are mounted on the backup shaft 32 which is rotatably supported by the roller bearing 88 in the bearing 50, as shown as a representative of the upper backup roll device 28 in FIG. Has been done.

Further, a work roll bending device 100 and an intermediate roll bending device 200 are incorporated in the housing 20, which is shown in FIG.

First, the work roll bending apparatus 100 includes an upper roll bending rod 102, a lower roll bending rod 104, a roll bending cylinder block 106, and a piston 108. A lower end portion of the upper roll bending rod 102 is fixed to the piston 108, and an upper end portion thereof is disposed so as to be able to come into contact with and separate from the upper work roll bearing 46. On the contrary, the lower roll bending rod 104 has an upper end fixed to the piston 108 and a lower end freely contactable with and separated from the lower work roll bearing 47. The piston 108 is built in the bore portion 107 of the cylinder block 106, and a communication hole 110 of a small diameter is provided in the bore portion 107 located in the middle of both pistons 108. Is introduced, the roll bending rods 102 and 104 are separated from each other and act to press the bearings 46 and 47 of the upper and lower work rolls 21 and 22 toward the bearings 48 and 49 of the intermediate rolls 24 and 26, respectively. .

Similarly, in the intermediate roll bending device 200, a bore portion 207 which is independent of the bore portion 107 is bored in the cylinder block 106, and a pair of pistons 208 are slidably attached to the bore portion 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 and 204 are projected from the cylinder block 106 to abut the intermediate roll bearings 48 and 49. It is possible. The bore portion 207 is also provided with a small-diameter communication hole 210 in the center thereof, and by introducing pressure oil from the pressure oil supply device into this, the roll bending rods 202 and 204 separate from each other, and the intermediate roll 24 , 26 of the upper and lower backup roll units 28, 30 are pressed against the bearings 50, 52 of the upper and lower backup roll units 28, 30, respectively.

Liners 112 and 114 are attached to the sliding surfaces of the roll bending cylinder block 106 and the upper and lower work roll bearings 46 and 47, respectively, and the sliding is performed when pressure oil is supplied to the cylinder block 106. The surface is slid to reduce the sliding resistance between the work roll bearings 46 and 47 and the cylinder block 106.

As shown in FIG. 5, the reduction cylinder 54 has a head 116 built therein, and at the time of compression, the pressure oil is introduced into the pressure reduction cylinder 54 from a pressure oil supply device (not shown) to move the head 116. I am trying to raise it. The operation of the head 116 pushes up the backup shaft bearing 52 of the lower backup roll unit 30, and the reduction force is the lower support rolls 38R, 38L, the lower intermediate roll 26, the lower work roll 22, the upper work roll 21, the upper intermediate roll 24. , The upper support rolls 34R, 34L, the upper backup shaft bearing 50, and the housing 20 to transmit a desired rolling force.

The operation of the rolling mill configured as described above is as follows. Prior to 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 rolling positions of the support rolls 34 and 38 to the work rolls 21 and 22 are set in such a position as to overlap the side portions of the material 23 to be rolled. After that, the work rolls 21, 22, the intermediate rolls 24, 26 and the support rolls 34, 38 are lightly contacted with each other by using the roll bending rods 102, 202 and a roll balancing cylinder (not shown). Then, after that, the position adjusting hydraulic cylinder 81 of the support rolls 34 and 38 is driven to move it to a preset position. As a result, the interval between the pair of support rolls 34R, 34L and 38R, 38L is set to a desired interval.

After the initial setting is completed, the rolled material 23 is passed between the work rolls 21 and 22. At the time of passing the rolled material 23, the support rolls 34 and 38 are pressed against the backup shafts 32 and 36 and the intermediate rolls 24 and 26 via the work rolls 21 and 22, respectively. Therefore, sliding friction occurs between the backup shafts 32 and 36 and the support rolls 34 and 38 as the backup shafts 32 and 36 rotate, and the support rolls 34 and 38 rotate as the backup shafts 32 and 36 rotate. Will also be accompanied. That is, since rolling bearings are arranged between the backup shafts 32 and 36 and the bearings 50 during rolling, rolling friction occurs, and further, slippage between the backup shafts 32 and 36 and the support rolls 34 and 38 occurs. The support rolls 34, 38 rotate integrally with the backup shafts 32, 36 due to the difference in frictional force from friction.

As a result, the material 23 to be rolled is rolled to a desired plate thickness and comes out 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 stretch or the middle stretch occurs due to this determination, the hydraulic cylinders 81 and 82 are operated to bring the pair of support rolls 34R and 34L and 38R and 38L close to each other or independently. By moving the positions so as to oppose each other, the bending moment amount acting on the work rolls 21 and 22 through the intermediate rolls 24 and 26 can be adjusted, occurrence of abnormal shape can be suppressed, and a rectangular strip material can be obtained. At this time, since the bending amount of the intermediate rolls 24 and 26 is controlled by adjusting the bending force of the intermediate roll bending device 200, the interaction with the position movement amounts of the support rolls 34R and 34L and 38R and 38L is performed. ， It is possible to exert a large shape correction function. That is, the correction area can be adjusted by moving the positions of the support rolls 34R, 34L and 38R, 38L, and the correction amount can be adjusted by the intermediate roll bending device 200.

When the rolled material 23 has edge drops, the bending force of the work rolls 21 and 22 by the work roll bending device 100 is controlled. Since both ends of the work rolls 21 and 22 project from the intermediate rolls 24 and 26, by supplying pressure oil to the bending device 100, the rods 102 and 104 project and the work rolls 21 and 26 come out from the edges of the intermediate rolls 24 and 26. The protruding part is largely bent and acts to control the edge drop. Of course, since the work rolls 21 and 22 also have rigidity, the bending force is transmitted to the intermediate rolls 24 and 26.

According to the rolling mill of such an embodiment, the bending fulcrums of the work rolls 21 and 22 or the intermediate rolls 24 and 26 can be freely changed, so that the work rolls 21 and 22 are restrained by the conventional full-contact backup roll. Without it, the roll bending effect can be fully exerted. Further, since the positions of the upper and lower support rolls 34R, 34L and 38R, 38L can be individually changed, the shape can be controlled 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 control not only shape defects of composite elongation that is a composite of the two.

Further, since the work roll bending device 100 and the intermediate roll bending device 200 are provided, the plate full width shape control is performed by the intermediate roll bending, and the plate end shape control such as edge drop is performed by the work roll bending. Therefore, the control operation becomes very easy. Further, since the positions of the support rolls 34 R, 34 L and 38 R, 38 L can be symmetrically performed in the vertical and horizontal directions, the shape control can be performed symmetrically in the plate thickness direction and the plate width direction of the rolled material 23. It is possible to obtain a rolled product with excellent accuracy.

In addition, since the positions of the support rolls 34R, 34L and 38R, 38L can be adjusted more freely depending on the plate width, the contact surfaces between the work rolls 21 and 22 and the plate width end portions can be more effectively combined with roll bending. It can be made smooth and the edge drop prevention effect is high. Further, since the intermediate rolls 24 and 26 are provided, the diameters of the work rolls 21 and 22 can be made small, so that the rolling load area can be reduced and the rolling under high pressure can be performed. The amount and roll flat deformation can be reduced. Further, since the plate thickness and the plate width direction can be controlled symmetrically, the rolled material 23 does not meander when it is threaded, and stable threading characteristics can be obtained.

In the above embodiment, an example of application to the 6-high rolling mill provided with the intermediate rolls 24 and 26 is shown, but it can be applied to the backup roll of the 4-high rolling mill shown in FIG. 7 (1). The diameter of the work rolls 21 and 22 as shown in FIG. 2 (2) can also be applied to those having a larger diameter than the intermediate rolls 24 and 26. It can also be applied to the backup roll of a cluster rolling machine as shown in Fig. 3 (3). 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 having the backup roll device of the embodiment only on the upper portion. Further, in the above-mentioned embodiment, an example of application of a pair of support rolls 34R, 34L or 38R, 38L is shown, but it can also be applied to a rolling mill having a plurality of support rolls 34, 38 such as three and four. It is possible. Further, in the above embodiment, the ball bearing is used as the thrust bearing, but a cross roller bearing or the like may be used.

[0032]

[Effect of device]

 As is clear from the above description, in the back-up roll device of the rolling mill according to the present invention, a pair of work rolls for rolling down the rolled material, a pair of intermediate rolls for rolling contact with each work roll, and an intermediate roll. And a back-up roll that rolls into the housing. Both end bearings of each roll are mounted on the housing, and a pressure step for crown control is performed on the housing by adjusting the bearing spacing between the pair of work rolls and the intermediate roll. In a built-in rolling mill, each back-up roll is formed by a pair of separation support rolls having a short cylinder width and separated in the roll axial direction, and the separation support rolls are rotatably supported and axially slidable. A backup shaft that is supported by the above-mentioned housing. In addition, the separation support roll is installed, and the outer circumference of the backup shaft and the inner circumference of the separation support roll are arranged so that they can be loosely fitted. The hydraulic cylinder installed in the backup shaft bearing and the outside measurement of the support roll are installed. By arranging the deep groove type ball bearing in the frame of the connecting part provided on the surface, the pair of support rolls can be brought close to each other, and the roll bending effect can be sufficiently exerted even on the narrow material to be rolled. Can be demonstrated. Furthermore, since the width of the support roll can be made long, the Hertzian stress between the intermediate roll or work roll and the support roll is reduced, damage to the roll surface can be prevented, and the roll life is extended. is there . Also, since the support roll is driven by the hydraulic cylinder, the shape control effect is high, and in particular, the hydraulic cylinder can be set so as to prevent it from tilting due to the contact friction of the support roll. You can have it.

[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 the present invention.

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

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a front view of the rolling mill according to the embodiment.

FIG. 5 is a side view of the rolling mill.

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

FIG. 7 is an example of another rolling mill on which the backup roll device according to the embodiment can be mounted.

[Explanation of symbols]

 20 Housing 21, 22 Work Roll 23 Rolled Material 24, 26 Intermediate Roll 28, 30 Backup Roll Unit 32, 36 Backup Shaft 34R, 34L, 38R, 38L Support Roll 42R, 42L Thrust Bearing 46, 47, 48, 49, 50 , 52 bearing 54 reduction cylinder 81, 82 hydraulic cylinder 88 roller bearing 100 work roll bending device 200 intermediate roll bending device

Claims (1)

[Scope of utility model registration request] [Claim 1] A pair of work rolls for rolling down the rolled material, a pair of intermediate rolls for rolling contact with each work roll, and a backup roll for rolling contact with the intermediate roll are provided, and both end bearings of each roll are attached to the housing. In a rolling mill in which pressurizing means for controlling crowns by adjusting bearing intervals between the pair of work rolls and the intermediate rolls is incorporated in the housing, a cylinder width in which the backup rolls are separated in the roll axial direction is provided. A backup shaft which is formed by a pair of short separation support rolls and rotatably supports the separation support roll and is slidable in the axial direction. The backup shaft is rotatably supported by the housing and separated. Install the support roll and separate the support shaft from the outer peripheral surface of the backup shaft. A deep groove ball bearing is arranged in the frame of the hydraulic cylinder installed in the backup shaft bearing and the connecting part provided on the outer side surface of the support roll so that it can be loosely fitted between the inner peripheral surfaces of the support roller. A backup roll device for a rolling mill, which is characterized in that