JPH0615805U - Backup roll device for rolling mill - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a rolling mill with a sleeve roll moving device that allows the backup fulcrum to be changed arbitrarily, and the change operation is easy and the fulcrum positioning can be ensured. A backup shaft that is rotatably supported by a rolling mill housing is formed of a shaft body and a segment that is mounted on the outer periphery of the shaft body and is divided into a plurality of portions in the circumferential direction.
A taper mechanism is formed between the shaft body and the segment, and a movable sleeve roll is arranged on the outer circumference of the segment. When the movable sleeve roll is moved in the axial direction, it is clamped from the outside of the sleeve roll, and
The movable sleeve moving device can be operated by a guide roller provided at the tip.

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. .

A strip material having a desired plate thickness is obtained by passing the material to be rolled through such a rolling mill. However, 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-height cross-sectional shape with a thick central part and thin side edges, a crown is formed on the backup roll, and the bending cylinder acts to expand the necks of the work rolls in mutually expanding directions. The work roll is adjusted so that the pressure lower surface of the work roll is flat, and shape control is performed to correct the crown generated in the rolled material.

However, in the above-described conventional rolling mill, since the work rolls are constrained on all surfaces of the backup rolls, it is difficult to give sufficient roll bending to the work rolls, and the absolute ability of shape control is not sufficient. On the other hand, especially in a 4-high rolling mill, there is a drawback in that it is necessary to change the backup roll by changing the crown shape depending on the strip width, strength and shape of the material to be rolled.

Further, in JP-A-51-103058 and JP-A-52-97353, a crown of a plate is controlled by installing a sleeve on a backup roll of a four-high rolling mill at a position corresponding to the plate width. The method of doing is proposed. However, in these methods, the realization of a method of rolling materials with different strip widths and a method of receiving the thrust force generated in the sleeve roll during rolling has been questioned. Further, a sleeve roll moving method is proposed in Japanese Patent Publication No. 53-48051, Japanese Patent Laid-Open No. 53-48051 and Japanese Patent Laid-Open No. 61-37002, but in this type of rolling machine, a sleeve roll is used. Since the backup roll is in a loose fit even during rolling, wear occurs between the inner surface of the three roll and the outer circumference of the backup roll, and it is necessary to frequently grind the inner surface of the sleeve roll and the outer circumference of the backup roll. However, there is a problem in that it is difficult to realize a method for highly accurately and frequently grinding the inner surface of a long three-roll.

[0006]

[Problems to be solved by the device]

 The purpose of the present invention is to pay attention to the above-mentioned conventional problems. In order to shift the sleeve roll and greatly increase the bending control amount of the work roll, the roll in the strip width direction of the rolled material can be significantly increased. The bending fulcrum can be quickly set to an arbitrary position to provide a good shape control function. In particular, it is an object of the present invention to provide a backup roll device for a rolling mill, which can easily change the bending operation, can reliably position the bending fulcrum, and does not require polishing of the inner surface of the sleeve roll.

[0007]

[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 is such that a part of a trunk length of a backup shaft which is rotatably supported by a rolling mill housing is tapered from a central portion toward an axial end, A segment member having the same taper inner surface as the backup shaft and movable in the axial direction by being divided into a plurality of pieces is mounted on the backup shaft, and is mounted on the outer periphery of the segment member so as to be movable in the axial direction. A movable sleeve roll that rolls on the roller, and the segmental member is moved in the axial direction to expand the movable sleeve roll in the radial direction to fix the movable sleeve roll at an arbitrary position. At the time of movement, the movable sleeve roll should be clamped from outside and placed on the bearing itself. To constitute and movably disposed in the axial direction by the movable sleeve moving device provided with a rotatable guide roller at the tip.

[0008]

[Action]

 According to the above configuration, the function of each back-up roll that directly suppresses the material to be rolled and that suppresses bending of the work roll is exerted by the movable sleeve roll and the back-up shaft on which it is mounted to support the work roll rolling force. To do. These movable sleeve rolls are movable in the axial direction, and by moving their positions, the bending moment fulcrum changes, and the amount of roll bending is adjusted by the bending means provided on the work roll neck. be able to. Therefore, the overall amount of bending is controlled by the position movement of the movable sleeve roll, the shape of the crown of the material to be rolled can be controlled, and the bending moment fulcrum can be changed arbitrarily. Control ability is greatly improved.

Here, in order to move the position of the movable sleeve roll, a tilting shaft is provided in parallel with the movable sleeve roll on the inlet and outlet sides of the housing of the rolling mill, and the movable sleeve roll is held and moved by this. Install the guide roller. Next, the guide roller may be driven by an electric motor or the like while the segment member is retracted and a certain gap is provided between the movable sleeve roll and the segment member.

[0010]

【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 and 2 show the overall configuration of a rolling mill according to an embodiment. As shown in the figure, a pair of upper and lower work rolls 21 and 22 parallel to the gate-shaped housing 20 are horizontally mounted so as to be capable of rolling contact with each other, and the rolled material 23 can be passed between them. A pair of backup roll units 28 and 30 are horizontally mounted on the housing 20 in parallel with the upper and lower work rolls 21 and 22 so as to rotate and sandwich them from above and below. The upper backup roll unit 28 has a backup shaft 32 arranged in parallel with the work roll 21, and the movable sleeve roll 34 is attached to the backup shaft 32 so as to be slidably movable in the axial direction. The movable sleeve roll 34 rolls on the upper work roll 21 and serves as a backup support for the work roll 21 during rolling. Similarly, the lower back-up roll unit 30 also has a back-up shaft 36 and a movable sleeve roll 38 mounted on the back-up shaft 36, and these are brought into rolling contact with the lower work roll 22 to provide a back-up support during rolling. There is.

As shown in FIG. 2, bearings 46, 47, 50, 52 are attached to the neck portions of the backup shafts 32, 36 of the upper and lower work rolls 21, 22 and the upper and lower backup roll units 28, 30, respectively. These are mounted on the housing 20 in a column arrangement. 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.

FIG. 3 shows the upper backup roll device 28, and the movable sleeve roll 34 of this device 28 can be positionally adjusted by slidingly moving in the roll axial direction. The backup shaft 32 is rotatably supported by the bearing 50, and the outer surface of the shaft is formed with a tapered surface whose outer diameter is gradually reduced from the central portion toward the end side. On the outer peripheral surface of the shaft 32, segments 76R and 76L each having a tapered inner surface divided into four in the circumferential direction are mounted so as to be movable in the axial direction of the shaft 32. Further, hydraulic cylinders 130R and 130L are attached to the long end of the shaft 32, and by moving the segments 76R and 76L in the axial direction, the segments 76R and 76L are expanded in the radial direction and the movable sleeve roll 34 is desired. It is possible to fix it at any position. Here, the rotary joints 131R and 131L supply pressure oil to the hydraulic cylinders 130R and 130L from a hydraulic device (not shown).

To expand or contract the segment 76, as shown in FIGS. 4 to 5, the T-shaped key 102 is fixed to the outer surface of a part of the tapered portion 78, and the corresponding tapered surface of the segment 76 side. A T-shaped key groove 104 is formed on the inner surface. When the segments 76 are mounted, they are fitted to each other so that the segments 76 are not separated from the shaft main body 32 in the radial direction and are not rotationally moved in the circumferential direction to connect them. The torque transmitted to the backup shaft 32 due to the rolling load is due to the frictional force between the movable sleeve roll 34 and the segments 76L and 76R generated by enlarging the segments 76L and 76R and the frictional force between the segments 76L and 76R and the backup shaft 32. The structure is such that it is transmitted and is not transmitted to the T-shaped key 102.

In such a configuration, the above-mentioned three rolls 34 of the upper backup roll unit 28 and the movable sleeve rolls 38 of the backup roll unit 30 can be adjusted in position by moving in the roll axial direction. . To adjust this position, sleeve roll moving devices 201, 202, 203 and 204 are installed on the inlet and outlet sides of the rolling mill housing along the axial direction of the movable sleeve rolls 34 and 38.

In this moving device, as typically shown in the upper sleeve roll moving device 202 of FIGS. 6 and 7, a tilting shaft 205 is held between the housings 20 by a bearing 206. A roller arm 207 is fixed on the tilting shaft 205 with a key so as not to move in the axial direction of the tilting shaft 205. Further, a guide roller 208 and a roller driving device 209 are installed on the roller arm 207, and when appropriately rotated, the guide roller 208 rotates via the drive shaft 210, and subsequently, the guide roller 208. A movable sleeve roll 34, which is in contact with 208, is configured to move axially.

The tilting shaft 205 is rotated by expanding and contracting a rod 211 a of a hydraulic cylinder 211 attached to the housing 20, and then the roller arm 207 is opened and closed by the rotation of the tilting shaft 205 to guide it. Each of the movable sleeve rolls 34 and 38 can be opened or pinched by the roller for use 208. Further, a work roll bending device 100 for bending the work rolls 21 and 22 is incorporated in the housing 20.

The operation of the rolling mill configured as described above is as follows. Before rolling, the positions of the movable sleeve rolls 34 and 38 are determined in advance according to the width of the material 23 to be rolled. In this case, the position of rolling contact between the movable sleeve rolls 34 and 38 with respect to the work rolls 21 and 22 is set to such a position as to overlap the side portion of the material 23 to be rolled. For this initial setting, the roll bending device 100 and a roll balancing cylinder (not shown) are used, and the movable sleeve rolls 34 and 38 are set at predetermined positions so that the movable sleeve rolls 34 and 38 do not come into contact with the work rolls 21 and 22. Hold. Then, the hydraulic cylinders 211 are used to operate the sleeve roll moving devices 201, 202, 203 and 204 to clamp the movable sleeve rolls 34 and 38. Then, the hydraulic cylinders 130 at the ends of the backup shafts 32 and 36 are activated to set the limit, and a gap is formed between the segment 76 and the movable sleeve rolls 34 and 38.

In this way, the movable sleeve rolls 34, 38 are freed from the backup shafts 32, 36, and the guide roller 208 is moved left and right by the drive motor 209 to move the movable sleeve rolls 34, 38 to the backup shafts 32, 36. It is moved to an arbitrary position on 36. After moving to a predetermined position, the hydraulic cylinder 130 is operated in reverse to extend and the segment 76 is moved to expand in the radial direction, thereby fixing the movable sleeve rolls 34 and 38 to a desired position.

As a result, the inner peripheral surfaces of the movable sleeve rolls 34, 38 that have moved in position are pressed and positioned integrally with the backup shafts 32, 36. After that, the hydraulic pressure of the hydraulic cylinder mechanism 130 is locked and the positions of the movable sleeve rolls 34 and 38 can be maintained. As a result, the distance between the pair of movable sleeve rolls 34 and 38 is set to a desired distance. After that, the work rolls 21 and 22 are lightly contacted with the movable sleeve rolls 34 and 38 by using the roll bending device 100 and the roll balance cylinder.

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 using light or magnetism. If the edge extension or middle extension occurs due to this determination, the hydraulic cylinder mechanism 130 and the drive motor 209 are actuated to move the pair of movable sleeve rolls 34 and 38 axially relative to each other to move the work rolls. It is possible to obtain a rectangular strip material by adjusting the amount of bending moment acting on the rolls 21 and 22 to suppress the occurrence of abnormal shape.

According to the rolling mill provided with the backup roll devices 28 and 30 of such an embodiment, since the bending fulcrums of the work rolls 21 and 22 can be freely changed, the rolling rolls are restricted to the conventional full-contact backup rolls. The roll-bending effect can be fully exerted without causing any trouble. Further, since the positions of the vertically movable sleeve rolls 34 and 38 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 rolled material, the advantage of being able to control shape defects of composite elongation that is a composite of the two is obtained.

In particular, in this embodiment, the backup shafts 32 and 36 are composed of the shaft main body 32 and the segment 76, and the segment member is expanded in the axial direction by moving the segment 76 in the axial direction of the shaft 32. Since the rollers 34 and 38 are fixed, the movable sleeve rolls 34 and 38 are securely fixed to the back-up shafts 32 and 36, and the thrust load generated during rolling can be received by the roller bearings in the bearings 50 and 52. it can. Further, since the inner surfaces of the movable sleeve rolls 34 and 38 are integrated with the segment member 76, it is not necessary to polish the inner surface, and only the outer periphery of the movable sleeve rolls 34 and 38 need to be polished like the backup roll of the conventional four-high rolling mill. .

Although the above embodiment is applied to the four-high rolling mill, it can be applied to the four-high rolling mill shown in FIG. 8 (1) and the six-high rolling mill shown in FIG. 8 (2). Further, for example, a pair of sleeve roll moving devices 201, 202, 203 and 204, which are arranged on the left and right in the axial direction of the movable sleeve rolls 34 and 38, are used as a pair, and a chain is stretched, and they are mutually driven and simultaneously driven. You may do it.

[0025]

[Effect of device]

 As described above, the backup roll device of the rolling mill according to the present invention is such that a part of the trunk length of the backup shaft that is rotatably supported by the rolling mill housing is tapered from the central portion toward the shaft end. A segment member that has the same taper inner surface as the backup shaft and is divided into multiple parts and that can move in the axial direction is mounted on the backup shaft. A movable sleeve roll that rolls is arranged, and the segmental member is moved in the axial direction to expand the movable sleeve roll in the radial direction to fix the movable sleeve roll at an arbitrary position. Sometimes, the movable sleeve roll is clamped from the outside so that it can be supported freely. By arranging the movable sleeve moving device with a rotatable guide roller at the tip end so that it can move in the axial direction, the movable sleeve roll can be held and moved without load, and the inner surface of the movable sleeve roll can be moved. Also, since the movable sleeve roll can be moved reliably according to the strip width and shape of the material to be rolled without scratching the outer surface, the bending control amount of the work roll can be greatly increased, thus improving the shape control capability. The excellent effect of being able to be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a front view of a rolling mill according to an embodiment of the present invention.

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

FIG. 3 is a sectional front view of a main part of a backup shaft device for a rolling mill according to an embodiment.

4 is a cross-sectional view of FIG.

FIG. 5 is an enlarged cross-sectional view of an assembly portion of a shaft body and a segment.

FIG. 6 is an enlarged view of a main part of a sleeve roll moving device of the rolling mill.

FIG. 7 is a side view of FIG.

FIG. 8 is an example of another rolling mill in which the embodiment backup roll device can be mounted.

[Explanation of symbols]

20 Housing 21, 22 Work Roll 23 Rolled Material 28, 30 Backup Roll Unit 32, 36 Backup Shaft 34, 38 Movable Sleeve Roll 46, 47, 50, 52 Bearing 54 Reduction Cylinder 76R, 76L Segment 100 Work Roll Bending Device 130R, 130L hydraulic cylinder 131 rotary joint 201,202,203,204 sleeve roll moving device 205 tilting shaft 208 guide roller 209 roller drive device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location // B21B 13/14 H 7819-4E

Claims (1)

[Scope of utility model registration request] 1. A backup shaft, which is rotatably supported by a rolling mill housing, has a part of its trunk length tapered from the center toward the shaft end, has the same tapered inner surface as the backup shaft, and is divided into a plurality of parts. A segment member that is movable in the axial direction is mounted on the backup shaft, and a movable sleeve roll that is mounted so as to be movable in the axial direction and is in rolling contact with a work roll is arranged on the outer periphery of the segment member. By moving the movable sleeve roll in the radial direction to fix the movable sleeve roll at an arbitrary position. Movable sleeve moving device that has a guide roller that can be freely arranged at the tip A backup roll device for a rolling mill, wherein the backup roll device is arranged so as to be movable in the axial direction.