JPH0570702U - Backup roll device for rolling mill - Google Patents

Abstract

(57) [Summary] [Purpose] The change operation is easy, the bending fulcrum can be positioned reliably, and the support rolls can be easily reassembled. [Construction] A guide shaft parallel to the backup shaft, which is equipped with a pair of support rolls with a short body width that are movable in the axial direction and are in rolling contact with an intermediate roll on the outer periphery of the backup shaft that is rotatably supported by the bearings and is fixedly supported by the housing. In addition, the slide casing that is movable in the mounting axis direction is equipped with an arm that can be opened and closed in the radial direction of the backup shaft, making it easy to reassemble the support rolls.

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 applied to 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. 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 and these work rolls are sandwiched from the outside. It is equipped with a backup roll with a relatively large diameter, both of which are formed to have almost 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. However, as the material to be rolled passes, the central portion of the work roll is expanded, and after rolling, Since the material to be rolled has a so-called middle-height cross-sectional shape with a thick central portion and thin side edges, a crown is formed on the backup roll and the bending chilling acts to expand the necks of the work rolls. 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 backup roll to change the crown shape depending on the strip width, strength, shape, etc. of the material to be rolled. Moreover, 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 control at any position is not possible. Moreover, it is necessary to polish the entire surface of the backup roll in terms of maintenance, and there is the drawback 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.

The object of the present invention is to focus on the above-mentioned conventional problems and to have a quick response to the conditions that change momentarily in high-speed rolling and to greatly increase the work roll bending control amount. The roll bending fulcrum in the strip width direction of the material to be rolled can be quickly set to an arbitrary position to have a good shape control function. Especially, the changing operation is easy and the positioning of the bending fulcrum can be surely performed. It is an object of the present invention to provide a backup roll device for a rolling mill in which the support rolls can be easily recombined.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, a backup roll device for a rolling mill according to the present invention comprises a pair of work rolls for rolling down a rolled material, and a pair of back-up rolls rollingly contacting each work roll. In the backup roll device of the rolling mill, in which the pressurizing means for adjusting the bearing spacing between the pair of work rolls and crown control is installed in the housing while mounting the The separation support roll is formed by a pair of support rolls with a short body width that are separated in the axial direction, and this separation support roll is attached to a backup shaft that is rotatably supported and slidably supported in the axial direction. The backup shaft includes a guide shaft that is fixedly supported and a screw rod that is rotatably supported. The guide rolls are arranged parallel to each other and are mounted on the guide shaft so as to be movable in position, and the pair of guide members are screwed together with screw rods having opposite screws engraved on each other so as to be linked to each other. A support member that engages with the main body is attached, and an arm that can be opened and closed in the radial direction of the support member is provided.

[0007]

[Action]

 According to the above configuration, each backup roll, which controls the deflection of the work roll that directly rolls down the material to be rolled, is composed of a pair of support rolls separated in the axial direction of the roll, and partially roll-contacts with the work roll. Supports rolling force. These separation support rolls are movable in the axial direction, and the bending moment fulcrum changes when the position is moved, and the amount of roll bending by the pressing means of the work roll neck can be adjusted. Such a position movement of the separation support roll is performed by a screw rod in which guide members engaged with each of the pair of separation support rolls arranged coaxially are screwed to each other. That is, the interval between the pair of guide members is changed by rotating the screw rod, and the interval between the pair of separation rolls engaged with the guide member is adjusted accordingly. Therefore, the roll bending fulcrum set by the pair of separation support rolls is changed by the rotation of the screw rod, and the roll bending is performed independently or in cooperation with the pressure applied by the pressing means interposed between the work roll bearings. The amount can be adjusted quickly and the crown control in high speed rolling can be performed accurately. In particular, since the position movement of the separation roll is directly performed by the fluid pressure drive means, the responsiveness is high and proper position control is possible, and the fluid pressure means is expanded and contracted along the sliding direction of the guide member. The support roll moving device can be installed even if the installation is narrow and the space can be used effectively.

[0008]

【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.

1 to 4 show the configuration of a rolling mill including a backup roll device according to an embodiment. In this rolling mill, as shown in the drawing, a pair of upper and lower work rolls 21 and 22 which are 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. A pair of intermediate rolls 24 and 26, which are arranged in parallel with the upper and lower work rolls 21 and 22 so as to sandwich them from above and below, are horizontally mounted on the housing 20. The intermediate rolls 24 and 26 are formed to have a diameter smaller than that of the work rolls 21 and 22 so as to transmit a rolling force. In particular, 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 rolls 21 and 22. Therefore, while 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 in contact with each other as shown in FIG. , 26 are set so as to protrude from the end portions of 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 width shorter than the plate width of the material 23 to be rolled. The pair of support rolls 34R, 34L formed is attached so as to be rotatable and slidably movable in the axial direction. The pair of support rolls 34R and 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 backup 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 so as to roll on the lower intermediate roll 26. We also try to provide backup support at times.

Further, the support rolls 34R and 34L are provided at both ends of the support rolls 34R and 34L, which are arranged by inserting the backup shaft 32, as shown in the upper backup roll device 28 as a representative in FIG. Supports 62 and 64 are attached via thrust bearings 43 and 44. As shown in FIG. 1, the supports 62 and 64 are formed in a donut disc shape so as not to interfere with the backup shaft 32. The supports 62 and 64 are fixed to the arms 80R (80L) outside the supports 62 and 64, respectively. It is movable in the axial direction. Reference numeral 45 is a rotary bearing of the backup shaft. 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 have bearings 46 and 47 as shown in FIG. , 48, 49, 50, 52 are mounted, and these are mounted in the housing 20 in a tandem arrangement. Further, a rolling-down cylinder 54 is installed 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 the present embodiment will be described with reference to FIGS. 1 and 4. 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. For this position movement, the support rolls 34R, 34L are engaged with roll guides 56R, 56L as drive members.

As shown in FIG. 4, the backup shaft 32 has two guide shafts 58 mounted between the housings 20 and mounted in parallel with the backup shaft 32. The roll guides 56R, 56L are attached to the guide shaft 58, and the roll guides 56R, 56L are provided with slide casings 60R, 60L formed so as to penetrate the guide shaft 58 and not interfere with the support rollers 34R, 34L. ing. Then, a pair of arms 80R (80L) slidably engaged with a groove 61 having a T-shaped cross section formed in the lower part of the slide casings 60R, 60L in a direction intersecting with the moving direction of the slide casings 60R, 60L. ) Is attached, and the upper portions of the arms 80R (80L) are separated from each other by blocking the forward limit at the center of the slide casings 60R and 60L. The lower portion of the arm 80R (80L) is formed into a pair of horseshoe shapes so as not to interfere with the backup shaft 32 when approaching, and the support rolls 34R, 34L, thrust bearings 43, 44 and The support roll units 81R and 81L composed of the supports 62 and 64 are arranged so as to sandwich them.

The arm 80R is composed of a front arm 90 and a rear arm 91, and a hydraulic cylinder 83 is attached in a direction orthogonal to the front side of the front arm 90. The rod 83a of the hydraulic cylinder 83 is inserted through the front arm 90, and the front end of the rod 83a is fixedly mounted on the rear arm 91 to supply and discharge the hydraulic oil to and from the hydraulic cylinder 83. As a result, the front arm 90 and the rear arm 91 forming the arm 80R are opened and closed. Such a structure is the same in the arm 80L and also in the lower backup roll device 30.

Here, a drive means for appropriately moving the position of the support rolls 34R, 34L, 38R, 38L is provided for each backup roll device 28, 30. This means that the positions of the pair of separation support rolls 34R, 34L (38R, 38L) are axially arranged along the outer peripheral surface of the intermediate roll 24 (26) in accordance with the width dimension of the material 23 to be rolled and the plate shape. It is the one that makes them approach or separate. The upper back-up roll device 28 will be described as a representative example. As shown in FIG. , 70L, which are threadedly inserted into the slide casings 60R, 60L of the left and right roll guides 56R, 56L, 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, whereby the screw rods 70R can be individually moved in the axial direction. It is like this. Drive motors 72R and 72L for rotationally driving the screw rods 70R and 70L are attached to one bearing 50 of the backup shaft 32 to give a predetermined rotation to the screw rods 70R and 70L.

Of course, a single screw rod configuration may be used, and the screw may be cut 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, when the screw rod is rotated, the roll guides 56R and 56L screwed to the screw rod are moved toward or away from each other.

In the lower backup roll device 30 having the above-described configuration, two guide shafts 58, around which the backup shaft 36 is passed between the housings 20, are arranged above and below the screw rods 70R and 70L, respectively. It is formed so as to penetrate the guide shaft 58 so as not to interfere with the support rolls 38R and 38L, and is otherwise configured similarly to the upper backup roll device 28.

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 device 110 has an upper roll bending rod 112 and 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, and are bent by hydraulic pressure. I am trying to make it work. The intermediate roll bending device 120 has an upper roll bending rod 122 and a lower roll bending rod 124, which can be brought into contact with the intermediate roll bearings 48 and 49, respectively, so as to independently perform the bending action. There is.

It should be noted that in FIG. 3, reference numeral 54 is a pressure reduction cylinder for raising the head 130. The operation of the head 130 pushes up the backup shaft bearing 52 of the lower backup roll device 30, and this rolling force is applied to the lower support rolls 38R, 38L, the lower intermediate roll 26, the lower work roll 22, the upper work roll 21, the upper middle roll. It is transmitted to the roll 24, the upper support rolls 34R and 34L, the upper backup shaft bearing 50, and the housing 20 to generate a 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. In this case, the rolling position of the support rolls 34, 38 to the work rolls 21, 22 is set to a position where the rolling rolls overlap the side portions of the material 23 to be rolled. For this initialization, the roll bending rods 112 and 122 and a roll balancing cylinder (not shown) are used, and the support rolls 34 and 38 are supported so as not to contact the intermediate rolls 24 and 26. Then, after that, the position adjusting motor 72 of the support rolls 34, 38 is driven and moved to a preset position. As a result, the distance between the pair of support rolls 34R, 34L and 38R, 38L is set to a desired distance.

After this initial setting is completed, the rolled material 23 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 utilizing light or magnetism. If the ear stretch or middle stretch occurs due to this determination, the support rolls 34R, 34L and 38R, 38L are moved so that they are close to or away from each other, and the work rolls 21, 26 are passed through the intermediate rolls 24, 26. It is possible to obtain a rectangular strip material by adjusting the amount of bending moment acting on 22 to suppress the occurrence of abnormal shape. At this time, since the bending amount of the intermediate rolls 24, 26 is controlled by adjusting the bending force of the intermediate roll bending device 120, the interaction with the position movement amount of the support rolls 34R, 34L and 38R, 38L is controlled. This makes it 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 120.

When the rolled material 23 has an edge drop, the bending force of the work rolls 21 and 22 by the work roll bending device 110 is controlled. Since both ends of the work rolls 21 and 22 are projected from the intermediate rolls 24 and 26, by supplying pressure oil to the work roll bending device 110, the rods 112 and 114 are projected, and from the edge of the intermediate rolls 24 and 26. The protruding part is largely bent mainly and acts to suppress 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.

A case where the support rolls 34R and 34L are recombined after being used for a certain period of time will be described. First, the pressure reduction cylinder 54 is lowered, and a roll balance cylinder (not shown) is used to support the work roll 21 and the intermediate roll 24 and the intermediate roll 24 and the support rolls 34R and 34L with a gap. Then, pressure oil is introduced to the piston side of the hydraulic cylinder 83 attached to the arms 80R and 80L of the upper backup roll device 28 to open the front arm 90 and the rear arm 91. With the support roll units 81R and 81L mounted on the backup shaft 32, the support rolls 34R and 34L are moved in the axial direction together with the work roll 21 and the intermediate roll 24 and pulled out of the housing 20. After that, the replacement of the new support rolls 34R and 34L incorporated in the opposite direction to the above-mentioned removal is completed. The replacement of the lower backup roll device 30 can be performed in the same manner as the upper backup roll device 28.

According to the rolling mill equipped with the backup roll devices 28 and 30 of the 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 conventional full contact type The roll bending effect can be fully exerted without being restricted by the backup rolls. 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 obtain the advantage that it is possible to control not only shape defects of composite elongation that is a composite of the two.

[0027]

[Effect of the device]

 As is clear from the above description, the present invention has a pair of work rolls for rolling down the rolled material and a pair of backup rolls for rolling contact with each work roll, and the bearings at both ends of each roll are attached to the housing. At the same time, in a backup roll device for a rolling mill, in which a pressurizing means for adjusting the bearing spacing between the pair of work rolls and performing crown control is installed in the housing, the backup rolls are separated from each other in the axial direction of the roll. A guide shaft fixedly supported by the housing, which is formed by a pair of support rolls of a short width and is attached to a backup shaft that rotatably supports and axially slidably supports the separation support roll. And a screw rod rotatably supported in parallel with the backup shaft, A pair of guide members are attached to the guide shaft so that they can be moved, and screw rods having mutually opposite threads are screwed together to connect them, and a support member that engages with each of the separation roll bodies is attached. At the same time, by providing an arm that can be opened and closed in the radial direction of the support member, the position of the support roll can be determined simply by rotating the screw rod, and the support roll can be held stably. This makes it possible to set the bending fulcrum with certainty. In addition, the structure is simple, the cross-sectional performance of the backup shaft can be increased, and the deflection can be minimized, so that the rolling load can be set high. Also, the support rolls can be easily replaced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an upper backup roll device.

FIG. 2 is a front view of a rolling mill equipped with the backup roll device of the embodiment.

FIG. 3 is a side sectional view taken along the line III-III in FIG.

FIG. 4 is a side sectional view taken along the line IV-IV in FIG.

[Explanation of symbols]

 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 roll 43, 44 Thrust bearing 56R, 56L Roll guide 58 Guide shaft 60R , 60L Slide casing 62, 64 Support 70R, 70L Screw rod 72R, 72L Drive motor 80R (90, 91) Arm 80L (92, 93) Arm 110 Work roll bending device 120 Intermediate roll bending device

Claims (1)

[Scope of utility model registration request] 1. A pair of work rolls for rolling down a rolled material, and a pair of backup rolls rollingly contacting each work roll. Both end bearings of each roll are attached to a housing, and a bearing gap between the pair of work rolls is provided. In a backup roll device of a rolling mill in which a pressurizing means for adjusting the crown and controlling the crown is installed in the housing, the backup rolls are formed by a pair of support rolls each having a short cylinder width and separated in the roll axial direction. Attached to a backup shaft that supports the separation support roll rotatably and slidably in the axial direction.
A guide shaft fixedly supported by the housing and a screw rod rotatably supported are arranged in parallel with the backup shaft, and are mounted on the guide shaft so as to be movable in position. Screw rods having reverse screws engraved on each other are screwed together to be linked, a support member that engages with each of the separation roll bodies is attached, and an arm that can be opened and closed in the radial direction of the support member is provided. Backup roll equipment for rolling mills.