JPH04220108A - rolling mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a rolling mill used in the steel industry and non-ferrous metal industry, for forming a plate material such as a steel plate into a desired thickness by passing it between rolls and plastically deforming it. In particular, it relates to a rolling mill equipped with shape correction and crown correction means.

0002

2. Description of the Related Art A conventional four-high rolling mill is shown in FIGS. 10 to 12. This type of rolling mill is equipped with a pair of work rolls 1 and 2 of relatively small diameter, and back-up rolls 3 and 4 of relatively large diameter arranged to sandwich them from the outside. It is formed in a long shape and is rolled over its entire length, and both neck portions of each roll 1, 2, 3, 4 are supported by bearings 5, 6, 7, 8, and these are attached to a housing 9. There is. Also, housing 9
A rolling down cylinder 10 is attached to the roller 1, and a rolling down force is applied between the work rolls 1 and 2 by rolling down between the bearings 5 to 8 arranged in series.

A material to be rolled 11 is passed between the work rolls 1 and 2 of such a rolling mill to obtain a strip material of a desired thickness. 2 is widened, and a so-called roll bending occurs in which the center of passage of the rolled material 11 bulges outward from the both end bearings 5 and 6 side. For this reason, the backup rolls 3 and 4 are crown-shaped to absorb roll bending of the work rolls 1 and 2.

However, even if crowned backup rolls 3 and 4 are used, the amount of roll bending cannot be determined uniquely due to the properties of the material to be rolled 11 and the difference in rolling reduction, so in practice, as shown in FIG. , there is a difference (=H-h) between the end thickness h and the center thickness H of the rolled material 11.
This occurs, and the cross-sectional shape of the strip material after rolling becomes a drum-shaped cross-section with so-called selvage elongation occurring on both side edges. For this reason, various proposals have been made to obtain strip materials with a rectangular cross section.

A roll bending method is known as a conventional crown control method. In this method, a bending cylinder is attached to the roll neck, and the elastic deformation of the roll crown and work roll is canceled out to control the rolling surface of the work roll to become flat, thereby correcting the crown. That is, as shown in FIG. 11, a double rod type bending cylinder 12 is arranged between bearings 5 and 6 mounted on the necks of work rolls 1 and 2,
By expanding and contracting this cylinder 12, both bearings 5 and 6 are
The interval between the two can be adjusted, and the crown that is about to occur in the rolled material 11 can be corrected depending on the amount of bending. This is a work roll bending method, but there is also a backup roll bending method.

[0006] Furthermore, there is a VC roll method in which an oil chamber is provided in the rolling roll and the oil pressure applied thereto is adjusted to change the crown of the work roll, and a heat crown method in which the work roll is partially heated and expanded to change the crown. Alternatively, a method is known in which the amount of expansion is determined in detail by partially adjusting the amount of roll coolant applied.

[0007]

However, although the roll bending method is highly responsive and flexible, as shown in FIGS. 13(a) and 13(b), the work rolls 1 and 2 Because the backup rolls 3 and 4 are restrained on the entire surface, it is difficult to give sufficient deflection to the work rolls, and not only do they lack absolute capacity, but also the backup rolls are limited due to the width, strength, shape, etc. of the material to be rolled. There are disadvantages such as the need to rearrange the crown and change the crown shape.

[0008] Furthermore, in the VC roll method, the work roll structure becomes complicated, which makes it expensive and requires troublesome maintenance. Furthermore, although the heat crown method and the roll coolant method have flexibility, there is a problem in that the responsiveness is extremely poor.

An object of the present invention is to focus on the above-mentioned conventional problems, and to provide a method that can respond quickly to constantly changing conditions, especially in high-speed rolling, and has a wide range of work roll crown control functions. In particular, it is an object of the present invention to provide a rolling mill that can significantly increase the amount of work roll deflection control and that can provide high operability with a small number of parts.

0010

[Means for Solving the Problems] In order to achieve the above object, a rolling mill according to the present invention includes a pair of work rolls that roll down a rolled material, a pair of backup rolls that contact each work roll, In a rolling mill, in which bearings at both ends of each roll are attached to a housing, and a pressurizing means for adjusting the bearing interval between the pair of work rolls and performing crown control is incorporated in the housing, each of the backup rolls is mounted in the axial direction of the rolls. Each separated support roll is assembled to a backup shaft supported by a bearing in the housing via a bearing sleeve that rotatably supports the support roll, and the backup shaft is The machine has reverse threaded parts on the left and right sides in the axial direction, each bearing sleeve is screwed into these reverse threaded parts, and the spacing between the coaxial separation rolls can be adjusted by rotating the backup shaft in conjunction with the rotation transmission means. It is something.

[0011]

[Operation] According to the above configuration, each backup roll that suppresses the deflection of the work roll that directly rolls down the rolled material is
It is composed of a pair of support rolls separated in the axial direction of the rolls, each partially rolling into contact with the work roll to support the rolling force. These separation support rolls are movable in the axial direction, and by moving their positions, the bending moment fulcrum changes, and the amount of roll bending by the pressure means of the work roll neck can be adjusted. The position of the separation support roll is moved by rotating the backup shaft to which it is attached.

That is, since the backup shaft has a reverse threaded portion and a bearing sleeve that rotationally supports the support rolls is screwed onto this, the pair of support rolls can be moved closer to each other depending on the direction of rotation of the backup shaft. Alternatively, separation can be carried out arbitrarily and quickly. The backup shaft may be rotated by a rotation transmission means such as a motor. Therefore, by controlling the rotation of the backup shaft, the roll bending fulcrum set by the pair of separated support rolls is changed, and the amount of roll bending is controlled independently or in cooperation with the pressure applied by the pressure means interposed between the bearings of the work roll. It can be adjusted quickly and crown control can be performed accurately during high-speed rolling. In particular, since the position of the separation roll is moved by the rotation of the backup shaft to which the support roll is directly attached, it is possible to quickly and appropriately control the position, and with extremely simple components, a high crown control function can be achieved. It can be made to stand.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the rolling mill according to the present invention will be described in detail below with reference to the drawings, in which the rolling mill is applied to a four-high rolling mill.

FIGS. 1 and 2 show the overall structure of a four-high rolling mill according to an embodiment. As shown in the figure, a pair of upper and lower work rolls 22, 2 parallel to the gate-shaped housing 20
4 are horizontally suspended so that they can be rolled into contact with each other, and the material to be rolled 2 is placed between them.
6 is made possible to pass through the plate. On the back side of each of the upper and lower work rolls 22 and 24, an upper backup roll unit 28 and a lower backup roll unit 30 are also horizontally suspended in parallel.

The upper backup roll unit 28 has a backup shaft 32 arranged parallel to the work roll 22, which includes a backup shaft 32 that is separated to the left and right in the roll axis direction.
A pair of support rolls 34R, 3 formed with a short body length
4L is rotatably attached. The pair of support rolls 34R and 34L are in rolling contact with the upper work roll 22 and serve as backup support for the work roll 22 during rolling. Similarly, the lower backup roll unit 30 also includes a backup shaft 36, a pair of left and right support rolls 38R attached to the backup shaft 36,
It has a length of 38L and is brought into rolling contact with the lower work roll 24 to serve as a backup support during rolling.

The neck portions of the above-mentioned upper and lower work rolls 22 and 24 and the upper and lower backup roll units 28 and 3
As shown in FIG. 2, bearings 46, 48, 50, and 52 are attached to the neck portions of the backup shafts 32 and 36 of No. 0, and these are attached to the housing 20 in a cascade arrangement. A rolling down cylinder 54 is provided at the lower part of the housing 20, and by driving this, a predetermined rolling pressure is generated between the work rolls 22 and 24.

[0017] Here, the support rolls 34R, 34
As shown in FIG. 3 for the left support roll 34L of the upper unit 28, L, 38R, and 38L are the bearing sleeve 5 with the rotary bearing 40 interposed on the inner peripheral surface.
The bearing sleeve 56 is attached to the outer periphery of the bearing sleeve 6 and is attached by further attaching the bearing sleeve 56 to the backup shaft 32.

[0018] In such a configuration, the rolling mill has the following features:
The separation support rolls 34R, 34L of the upper backup roll unit 28 and the separation support rolls 38R, 38L of the lower backup roll unit 30 described above can each be adjusted in position by moving in the roll axis direction. For this position adjustment, support rolls 34R, 34L in each unit 28, 30
, 38R, and 38L.
and the backup shafts 32, 36 are screwed together, and the rotation of the backup shafts 32, 36 allows the sleeve 56 and the support roll 34 to move in the axial direction.

That is, as shown in FIGS. 1 and 3, the backup shaft 32 has a right-handed threaded portion 58R and a left-handed threaded portion 58L carved on the outer circumferential surface of each of the left and right halves, and has a so-called reverse threaded portion. It is formed as a screw shaft with a As described above, the bearing sleeves 56 (56R, 56L) that rotatably support the support rolls 34R, 34L are attached to the shaft 32, and the bearing sleeves 56 are screwed into the threaded portions 58R, 58L, respectively. Therefore, a female screw portion corresponding to the right screw portion 58R and the left screw portion 58L is also formed on the inner peripheral surface of each sleeve 56R, 56L. For this reason, each bearing sleeve 56R, 56 mounted coaxially
L functions as a sleeve nut, and by rotating the backup shaft 32, it is possible to perform a spiral movement such as approaching or moving away from each other.

Further, a gate-shaped bracket 60 (60R, 60L) formed to sandwich the support roll 34 from both end faces is integrally provided on the bearing sleeve 56, and the top end face is connected to the upper beam member 62 of the housing 20. I try to have them face to face. Then, as shown in FIG. 4, a guide groove 64 along the roll axis direction is formed in the upper beam member 62,
On the other hand, a guide protrusion 66 that fits into the guide groove 64 is provided on the top end surface of the bracket 60. This restricts the moving direction of the bearing sleeve 56 and prevents it from rotating along with the backup shaft 32.

[0021] The above-mentioned configuration is similarly configured for the lower backup roll unit 30, and in particular, the guide function is achieved by making the lower end surface of the bracket 60 face the lower pedestal 68, and forming a guide groove 64 and a guide protrusion 66 between the two. It is designed to perform a guiding action.

[0022] Here, the support rolls 34R, 34
A driving means for appropriately moving the positions of L, 38R, and 38L is provided for each backup roll unit 28, 30. A pair of separation support rolls 34R, 34L (
38R, 38L) are moved toward and away from each other in the axial direction along the outer peripheral surface of the work roll 22 (24) so as not to overlap with the material to be rolled 26. That is, one end of the backup shafts 32, 36 is made to protrude from the side of the housing 20, the chain sprockets 70, 72 are attached to these ends, and a linkage chain 74 is wound around these, and another sprocket 76 is attached to the upper backup shaft 32. At the same time, a drive chain 8 is installed between the motor 78 installed in the housing 20.
It is constructed by winding 0. When the motor 78 is thereby driven, this rotation rotates the upper backup shaft 32 via the drive chain 80, and the linkage chain 74
At the same time, rotation is transmitted to the lower backup shaft 36. Therefore, both backup shafts 32,
36 are rotationally driven in synchronization, and the pair of bearing sleeves 56R, 56L screwed onto each other, and thus the support rolls 34R, 34L (38R, 38L) can be moved toward each other or moved away from each other. .

Further, a roll bending device 100 is incorporated in the housing 20, and as shown in FIG.
It is composed of an upper roll bending rod 102, a lower roll bending rod 104, a roll bending cylinder 106, and a piston 108.

The lower end of the upper roll bending rod 102 is fixed to the piston 108, and the upper end is arranged so as to be movable toward and away from the upper work roll bearing 46. Also,
Conversely, the upper end of the lower roll bending rod 104 is fixed to the piston 108, and the lower end is movable toward and away from the lower work roll bearing 48. A small-diameter communication hole 110 is provided in the center of the cylinder 106, and when pressure oil is introduced here from a pressure oil supply device (not shown), the roll bending rods 102, 104 are separated from each other, and the upper and lower work rolls 22, 24 bearings 46 and 48 are pressed against bearings 50 and 52 of backup roll units 28 and 30, respectively.

[0025] Also, the roll bending cylinder 10
6 and the sliding surfaces of the upper and lower work roll bearings 46 and 48,
Liners 112 and 114 are attached to each liner, and when pressure oil is supplied to the cylinder 106, the liners slide on this sliding surface, pushing open the work roll bearings 46 and 48, and pushing open the support rolls 34 and 3.
8 and the work rolls 22, 24 are used as fulcrums to facilitate bending moment. As a result, the work roll rolling surface profile during rolling by the work rolls 22 and 24 is corrected and adjusted to become a flat surface.

Note that the reduction cylinder 54 is connected to the housing 2
This is provided at the lower part of the rolling cylinder 54, and has a built-in head, and during rolling, the head is raised by introducing pressure oil into the reduction cylinder 54 from the pressure oil supply device. The operation of the head pushes up the backup shaft bearing 52 of the lower backup roll unit 30, and this downward force is applied to the lower support rolls 38R, 38L and the lower work roll 2.
4, bearing 48, roll bending device 100, bearing 4
6. Upper work roll 22, upper support roll 34R
, 34L, the upper backup shaft bearing 50, and the housing 20 to generate the desired rolling force.

The operation of the rolling mill constructed 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 to be rolled 26. In this case, support rolls 34, 3
The rolling contact position of 8 to the work rolls 22 and 24 is the rolled material 2
6 to a position where no overlapping occurs, but this initial setting initially drives the reduction cylinder 54 to raise the lower backup roll unit 30 and keep the work rolls 22, 24 and support rolls 34, 38 in light contact. Then, the motor 78 for position adjustment of the support rolls 34, 38 is driven, and both the backup shafts 32, 36 are rotated. This has reverse screw threads 58R and 58L, to which bearing sleeves 56R and 56L are screwed, so that depending on the direction of rotation, the sleeves 56R and 58L are coaxial.
6L moves in the approaching direction or in the separating direction, thereby making it possible to adjust the distance between the pair of support rolls 34 (38). As a result, a pair of support rolls 34R, 34
L, and the intervals between 38R and 38L are set to desired intervals. In this state, the contact position of each of the support rolls 34 and 38 is made to be out of the rolling area of the material to be rolled 26.

After this initial setting is completed, the material to be rolled 26 is passed between the work rolls 22 and 24. As a result, the material to be rolled 26 is rolled to a desired thickness and output as a strip material, and the shape is determined visually, by a contact method using a sensor roll, or by a non-contact method using light or magnetism. If edge elongation or mid-elongation occurs as a result of this determination, the motor 78 attached to the housing 20 is driven to rotate the backup shafts 32 and 36 to rotate the paired support rolls 34R, 34L and 38R, 3.
By moving the 8L toward or away from each other, the amount of bending moment acting on the work rolls 22 and 24 can be adjusted, the occurrence of shape abnormalities can be suppressed, and a rectangular strip material can be obtained. .

FIGS. 6 and 7 show upper and lower work rolls 22 and 24.
The experimental results show how the profile changes depending on the magnitude of the bending force caused by adjusting the positions of the support rolls 34 and 38.

FIG. 6 shows a roll diameter of 600 mm and a rolling force of 600 mm.
The figure shows changes in the profile of the upper work roll 22 when the distance between the support rolls is set to 1400 mm and the roll bending force is adjusted from 0 to 125 tons.

FIG. 7 shows a roll diameter of 600 mm and a rolling force of 600 mm.
ton, the distance between the support rolls is set to 1600 mm, and the change in the profile of the upper work roll 22 is shown when the roll bending force is adjusted from 0 to 125 tons.

As can be understood from these results, it is found that the amount of deflection of the work roll can be arbitrarily changed by changing the roll bending force and the position of the support roll, thereby making it possible to adjust the cross section of the strip material. Therefore, it is possible to provide a crown control ability that allows shape control over a wide range.

Next, FIG. 8 shows a rolling mill according to a second embodiment. This means that the brackets 60 attached to the bearing sleeve 56 are not guided directly by the upper beam member 62, but are placed in an inverted T shape so that the upper beam member 62 faces each bracket 60.
A letter-shaped guide member 82 is provided for axial sliding guidance between this and the bracket 60. In the lower backup roll unit 30, there is a T on the pedestal 68.
A guide member 84 is attached in a letter shape and guided in the same manner. Such an embodiment is effective when the height of the housing 20 is high and the distance between the support rolls 34 and 38 and the upper beam member 62 and lower frame 68 is large.

In the rolling mills of the second embodiment and the first embodiment, since the rolling load is transmitted to the upper beam member 62, the load burden on the backup shafts 32 and 38 is reduced, and the roll diameter is reduced. It is possible to have a high backup function while making it small.

Next, FIG. 9 shows a rolling mill according to a third embodiment. A guide shaft 86 is provided in parallel with the backup shafts 32 and 36, and is slidably guided through the bracket 60. According to this embodiment, it is only necessary to provide the guide shaft 86, and the positions of the support rolls 34 and 38 can be adjusted with a simpler structure, resulting in a high effect with a small equipment load.

[0037]

[Effects of the Invention] As explained above, according to the present invention,
By arbitrarily changing the backup support portion of the work roll, crown control can be performed quickly and over a wide range, and the product shape can be modified extremely easily.

In particular, in the present invention, the position of the separation support rolls that serve as backup during rolling can be moved by screwing a bearing sleeve onto a reverse threaded portion cut into the backup shaft, and each support roll is rotatably attached to the bearing sleeve. With this structure, it is possible to adjust the distance between a pair of coaxially arranged separation rolls, so the position can be moved accurately while rolling work continues, and the movement speed can be increased, allowing for shape correction function. can be performed quickly and crown control can be performed through precise position control. In addition, the moving mechanism itself is composed of a combination of structural members that serve as backup supports, and does not require a complicated guide member or the like, so that it is possible to provide a high control function with an extremely simple structure.

[Brief explanation of the drawing]

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

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

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

FIG. 4 is a side cross-sectional view of the upper support roll portion.

FIG. 5 is a sectional view of the roll bending device.

FIG. 6 is a characteristic diagram of the amount of roll deflection accompanying the positional movement of the support roll.

FIG. 7 is a characteristic diagram of the amount of roll deflection accompanying the positional movement of the support roll.

FIG. 8 is a front view of a rolling mill according to a second embodiment.

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

FIG. 10 is a front view of a conventional four-high rolling mill.

FIG. 11 is the same side view of FIG. 8;

FIG. 12 is a schematic diagram showing roll deflection.

FIG. 13 is a schematic illustration of crown increase and decrease states.

[Explanation of symbols]

20
Housing 22, 24
Work roll 26

Rolled material 28, 30
Backup roll units 32, 36
Backup shaft 34R, 34L, 38R, 38L Support roll 40
Rotating bearings 46, 48, 50, 5
2 Bearing 54
Reduction cylinders 56R, 56L
Bearing sleeve 58R
Right thread part 58L

Left thread part 60
Gate type bracket 62

Upper beam member 64
Guide groove 66

Guide protrusion 68
Lower mounts 70, 72, 76
Chain sprocket 74, 80
chain 78
motor 100
roll bending equipment

Claims (1)

[Claims] 1. A pair of work rolls for rolling down a rolled material, and a pair of backup rolls for rolling contact with each work roll, with bearings at both ends of each roll attached to a housing, and a bearing interval between the pair of work rolls. In a rolling mill in which a pressurizing means is incorporated in the housing to adjust the pressure and control the crown, each of the backup rolls is formed by a pair of short support rolls separated in the roll axis direction, and each separated support roll is This is assembled to the backup shaft supported by the housing through a bearing sleeve that rotatably supports it, and the backup shaft is provided with reverse threaded portions on the left and right sides in the axial direction. A rolling mill characterized in that a bearing sleeve is screwed on, and the interval between coaxial separation rolls can be adjusted by rotating a backup shaft in conjunction with a rotation transmission means.