JPH0570703U - Backup roll device for rolling mill - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a rolled material that can be easily changed, the bending fulcrum can be positioned accurately, and is free from oil stains. [Structure] A pair of support rolls with a short body width, which are axially movable and rotatable and rotatably contact with an intermediate roll, are mounted on the outer circumference of a backup shaft that is rotatably supported by bearings, and an exposed backup between the housing and the separation support roll is installed. A bellows is provided to cover the surface of the shaft, and an oil seal is provided at sliding points of the support roll and the guide member.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 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 cylinders act to mutually expand the work roll necks. 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. In order to solve these drawbacks, it is conceivable to provide a pair of support rolls that can move and rotate in the axial direction of the backup rolls, and to expand or contract the support roll intervals according to the plate width. There still remains a problem that foreign matter adhering or dust floating in the air enters between the backup roll and the support roll during the axial movement of the support roll and hinders the smooth rotation of the support roll. There is also the problem that the lubrication material that has been lubricated will fall into the thrust bearing section and contaminate the material to be rolled.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention is provided with a pair of work rolls for rolling down the rolled material and a pair of backup rolls for rolling contact with each work roll. Both end bearings of each roll are attached to the housing. In a backup roll device of a spreader in which a pressurizing means for adjusting a bearing interval between the pair of work rolls and performing crown control is incorporated into the housing, a backup roll device in which the backup rolls are separated from each other in a roll axial direction is used. A guide shaft arranged parallel to the backup shaft, which is formed by a pair of support rolls of a short width, is attached to a backup shaft that rotatably supports and axially slidably supports the separation support roll. A guide member that is mounted on the shaft so as to be movable in position and that engages with each of the separation roll bodies is attached. , A pair of guide members are screwed together so that screw rods with opposite screws are screwed together to make it possible to adjust the separation roll interval and to expose the backup shaft surface exposed between the housing and the separation support roll. A bellows is provided to cover the separation support roll and the guide member, and an oil seal is provided at the sliding point.

[0006]

[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. No foreign matter enters between the backup roll and the support roll during the rolling operation of the material to be rolled, which enables safe and stable operation.

[0007]

【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 row of rolls, 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 divided 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 respectively 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 in FIG. Supports 62 and 64 are attached via thrust bearings 43 and 44. As shown in FIG. 4, the supports 62 and 64 are formed in a donut disc shape so that they do not interfere with the backup shaft 32. Reference numeral 45 is a rotary bearing of the backup shaft. As shown in FIG. 3, bearings 46 and 47 are provided on 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, respectively. , 48, 49, 50, 52 are mounted, and these are mounted in the housing 20 in a tandem arrangement. 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.

A specific configuration of the backup roll devices 28 and 30 according to the present embodiment in such a rolling mill 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. Further, oil seals 80, 81 are installed between the support rolls 34L, 34R and the supports 62, 64, and oil seals 82, 83 are also installed between the backup roll shaft 32 and the supports 62, 64. ing.

In the present invention, the support roll units 90R and 90L including the support rolls 34R and 34L, the thrust bearings 43 and 44, and the supports 62 and 64 and the bellows 42L and 42R are provided between the housing 20 and the support rolls. Bellows 41 are attached between the units 90R and 90L so as to cover the backup shaft 32. As shown also 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 and 56L are attached to the guide shaft 58, and are provided with slide casings 60R and 60L which penetrate the guide shaft 58 and are formed so as not to interfere with the support rolls 34R and 34L. .. Such a configuration is the same in the lower backup roll device 30.

Here, a drive means for properly 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. As shown in FIG. 1, a pair of screw rods 70R positioned at an intermediate portion of the pair of guide shafts 58 and rotatably supported by both end bearings 50. , 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, one screw rod structure 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 moved toward or away from each other at the same time. 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.

The above-described configuration is similarly configured in the lower backup 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 device 110 has a rod 112 for upper roll bending and a rod 114 for lower roll bending, which allow them to come into contact with and separate from the upper work roll bearing 46 and the lower work roll bearing 47, and are bent by hydraulic pressure. I am trying to do. 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 reducing 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 bellows 41, 42R, 42L are attached, and 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 the roll balance cylinder (not shown) are used, and the work rolls 21, 22, the intermediate rolls 24 and 26 and the support rolls 34 and 38 are lightly contacted. Then, after that, the position adjusting motor 72 of the support rolls 34 and 38 is driven to move it to a preset position. Thereby, 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 material 23 to be rolled is passed through 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.

Thus, even after the use for a certain period of time, there is no foreign matter caught between the backup roll 32 and the separation support rolls 34L and 34R, and there is no oil leakage of the lubricating oil, so that the material 23 to be rolled is kept clean. A desired rolling material 23 can be obtained because the rolling operation can be performed for a long time.

According to the rolling mill provided 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.

[0025]

[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. The separation support roll is formed by a pair of short width support rolls and is attached to a backup shaft that rotatably supports and axially slidably supports, and is arranged in parallel with the backup shaft. A guide member is mounted on the guide shaft so that it can move, and a guide member that engages with each of the separation roll bodies is attached At the same time, the pair of guide members are screwed together so that screw rods with opposite screws are screwed together to make it possible to adjust the separation roll interval, and the backup shuff exposed between the housing and the separation support rolls. By providing a bellows to cover the surface of the support, and by arranging an oil seal part at the sliding parts of the separation support roll and the guide member, the position of the support roll can be determined only by rotating the screw rod. Moreover, since the support roll can be stably held, the bending fulcrum can be set reliably. In addition, the oil seal prevents the lubricant from dropping on the top surface of the material to be rolled, and the bellows prevent the foreign matter from getting caught between the backup shaft and the support roll. Safe driving becomes possible.

[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 41,42L, 42R Bellows 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 80, 81, 82, 83 Oil seal 110 Work roll bending device 120 Intermediate roll bending device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B21B 37/00 117 117 B 8315-4E

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 are provided, 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 unit for adjusting the crown and for controlling the crown is incorporated in the housing, each of the backup rolls is formed by a pair of support rolls having a short cylinder width and separated in the roll axial direction. The separated support roll is attached to a backup shaft that rotatably and axially slidably supports,
A screw rod is mounted on a guide shaft arranged parallel to the backup shaft so as to be movable in position and engages with each of the separation roll main bodies, and a pair of guide members are provided with reverse screws to screw rods. The separation rolls can be adjusted by screwing them together and a bellows is provided between the housing and the separation support rolls to cover the exposed backup shaft surface, and further, the separation support rolls and the guide member slide. A backup roll device for a rolling mill, which is characterized by arranging oil seals at the points.