JPH04200809A - Rolling mill - Google Patents

Abstract

PURPOSE:To drastically increase the controlled variable of crown with work rolls by making a back-up roll for work roll into a pair of support rolls with short barrel length. CONSTITUTION:Each of back-up rolls 34, 38 with which the deflection of the work rolls 22, 24 with which a material 26 to be rolled is directly rolled down is restrained consists of a pair of support rolls which are separated in the direction of roll axis and drawing-down force is supported by bringing each into rolling contact with the work rolls partially. By moving these support rolls in the axial direction, the fulcrum of bending moment is changed, the quantity of roll bending with a pressurizing means at the roll neck can be adjusted. By this invention, the rolling mill has high adaptability that can correspond to conditions that are momentarily changed in high-speed rolling and the crown control function of work roll in a wide area is provided.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is used in the non-ferrous field of the steel industry, and is used to create a desired thickness by passing a steel plate or other plate material between rolls and plastically deforming it. The present invention relates to rolling mills for use in rolling mills, and more particularly to providing shape correction and crown correction means for rolling mills.

[Conventional technology]

A conventional four-high rolling mill is shown in Figures 3 to 11.

This type of rolling mill has a pair of relatively small diameter work rolls 1.
2, and relatively large-diameter hack-and-rolls 3 and 4 arranged to sandwich these from the side of the lever I, both of which have approximately the same body length 6Z and lie over the entire length.
Both necks of each roll 1, 2° 3.4 are connected to bearings 5, 6, 7. The FH trowel is supported by the FH iron and the two are attached to a housing 9. Further, 1. A reduction cylinder 10 is installed in the housing 9, and a reduction cylinder 10 is provided between the work rolls 1 and 2 by pressing down between the bearings 5 and 8 arranged in tandem.

The material to be rolled 11 is passed between the wheels 1 and 2 of the upper/eel rolling mill to obtain a stock material with a desired thickness. As a result, the central part of the i-no-crawl 1.2 is expanded, and the center of the passage of the rolled material 11 bulges out from the both end bearings 5.6 side.
So-called roll bending occurs. For this reason, the backup roll 3.4 is crown-shaped to absorb roll bending of the work roll 1.2.

However, the bank up roll 3 with a crown
．． 4, the amount of roll bending cannot be determined uniquely due to the properties of the material to be rolled 11 and the amount of rolling reduction, so in practice, as shown in FIG. 12, the end thickness of the material to be rolled 11 The difference (= H-ri,
) has occurred, and the cross-sectional shape of the strip material after rolling becomes a drum-shaped cross-section with so-called ear elongation on both side edges.
7 Ma・u. From these reasons, 1. Various proposals have been made to obtain strips of rectangular cross section.

A roll bending method is known as a conventional crown control method. In this case, a bending cylinder is placed on the roll neck, and the work roll is controlled so that the rolling surface of the work roll becomes flat so as to cancel out the elastic deformation of the roll crown and work roll, thereby correcting the crown. be. That is, as shown in FIG. 10, a bending cylinder 12 of the Rondo type is arranged between the bearings 5 and 6 attached to the neck of the work roll 1.2, and this cylinder 12 is made to expand and contract. This makes it possible to adjust the spacing between both bearings 5.6, and corrects the crown that is about to occur in the rolled material 11 in accordance with the amount of bending. This is a work role handing method, but there are also backup role and
...There is also the ending method.

In addition, there is a VC roll method in which an oil chamber is provided inside the rolling roll and the oil pressure applied to the oil chamber is adjusted to change the crown of the work roll.2.The work roll is partially heated and expanded to change the crown. - The crown method, or the method of partially adjusting the amount of roll coolant applied to determine the amount of expansion in detail, is known.

[Problem to be solved by the invention]

However, according to the roll-handling method, although the quick response and flexibility Q are high, the
), (1)), since the work roll 1゜2 is restrained by the entire surface of the backup rolls 3 and 4,
It is difficult to give sufficient deflection to the work roll,
. Not only does it lack absolute ability, but the pressure abrasive plate width, strength,
There are drawbacks such as the need to rearrange the backup roll and change the crown shape depending on the shape etc.

Further, in the VC roll method, the work roll structure becomes complicated, making it expensive and requiring 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 quick response that can respond to constantly changing conditions, especially in high-speed rolling, and to provide a wide range of work roll crown control functions. An object of the present invention is to provide a rolling mill that can significantly increase the amount of deflection control of a lower roll.

1. Means for Solving the Problems] In order to achieve the above object, the rolling mill according to the present invention has 1.
It is equipped with a pair of work openings for rolling down the rolled material and a pair of back-up rolls that are in rolling contact with each work roll, and bearings at both ends of each roll are attached to a housing, and a bearing between the pair of work rolls is provided. In a rolling mill in which a pressurizing means for adjusting the interval and controlling the crown is incorporated in the housing, one backup roll is formed from a pair of support rolls with a short body length, and the
A holding member for rotatably holding the roll is disposed, and a pair of hydraulic drive means having a telescoping rod facing the material to be rolled and extending and contracting in the axial direction of the C work roll is provided in the housing,
One end of the holding member is fixed to the tip of the piston rod so as to be slidable in the axial direction, and the roll interval of the support rolls can be adjusted, and the other backup roll is separated in the axial direction of the rolls. G is formed by a pair of support rolls with a short body length, rotatably supports this separation support roll, and is slidable in the axial direction.
It is configured by attaching it to the supporting backup shaft,
A guide member that is movably mounted on a guide shaft disposed parallel to the backup shaft and engages with the separation roll body is attached, and a screw rod having opposite threads carved in each of the pair of guide members is attached. The pair of guide members or screws are connected by screwing together. .

A driven wheel is attached to one of the wheels, a driving wheel is attached to the fixed side of the housing, etc., and the driven wheel and the driving wheel are arranged on the same axis so that rotation can be transmitted through a winding means such as a bolt. Separation 1:7 - The spacing between the claws can be adjusted.

[For production]

According to the structure described in -1-, each backup roll that suppresses 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 roll axis direction, and each back-up roll is partially connected to the work roll. The rolling blade is rotated in contact with the blade. These separated Zapo I rolls are movable in the axial direction, and by moving the position, the bending moment 1 to the fulcrum changes, and the amount of roll bending by the pressure means of the work roll neck can be adjusted. I can do it. If the position of such a separation roll is moved,
The upper back unroll is performed by the expansion and contraction of the rod of the hydraulic drive means attached to the housing, and the L
When the holding member is fixed to the tip of the blade, the distance between the pair of separation rolls engaged with the holding member is adjusted.

On the other hand, in the case of the lower knob roll, a pair of guide members are connected to each other by threading screw rods with opposite threads, a driven wheel is attached to either the pair of guide members or the screw rod, and the driven wheel is attached to the housing. By attaching a driving wheel to the fixed side of a vehicle, etc., and connecting the driven vehicle and the driving vehicle by wrapping a winding means such as a belt, 1. The pair of guide members can be moved toward or away from each other. . By threading the pair of guide members onto the screw rod in a reverse thread relationship, the guide members can be moved toward and away from each other by the rotated screw rod.

In this way, by changing the distance between the pair of guide members,
As a result, the distance between the pair of separation loaves engaged with the guide member is adjusted. Therefore, the roll bending fulcrum set by the pair of separated support rolls is changed, and the amount of roll bending can be quickly adjusted independently or in cooperation with the pressure applied by the pressure means interposed between the bearings of the work roll. Crown control can be performed accurately during high-speed rolling. In particular, since the position of the separation roll is moved by the winding transmission means, it is possible to quickly and accurately control the position, and even when there is no space available for installing the position control drive unit, the winding means can be extended. You can select any location.

〔Example〕

DETAILED 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.

1 and 2 show the overall configuration of a four-high rolling mill according to an embodiment. As shown in the figure, a pair of upper and lower work rolls 22, 24 parallel to the concave housing 20 are horizontally suspended so as to be able to roll into contact with each other, and a material to be rolled 26 can be passed between them. Such upper and lower work rolls 22.2
Each back side of 4 has 10 packs up roll Yuyut I-28
The lower back-up roll unit 30 is also horizontally suspended in parallel.

The upper backup roll unit 28 is separated into left and right sides in the roll axis direction, and has a short body length (it is attached so that a pair of support rolls 34R and 34L formed therein can rotate and slide in the axial direction).

The pair of support rolls 34R, 34L are brought into rolling contact with the work roll 22 during rolling.
It serves as a backup boat.

A pair of upper support rolls 34R, 34 having a circular shape
L is connected to the support shaft 13 by the support roll bearing 13 as a holding member for the support rolls 34R and 34L.
The upper support rolls 34R, 34L and the outer peripheral surface of the upper work roll 22 are rotated 1 and 2 in opposite directions while being in contact with the outer peripheral surface of the upper work roll 22 during rolling. Also,
Depending on the width dimension and plate shape of the plate material 26, the positions of the -L support rolls 34R and 34L are adjusted to the upper work roll 22.
Support roll moving cylinders 14 as hydraulic drive means are provided in a protruding manner on the outer wall of the housing 20 so as to be easily movable in the axial direction along the outer circumferential surface of the housing 20 . The support roll moving cylinder 14 and the support roll bearing 13 are connected to a pin support shaft 15a via the first roll moving cylinder rod 14a, and when moving the upper support rolls 34R and 34L in the axial direction of the upper work roll 22, When appropriate pressure oil is supplied to the support roll moving cylinder 14, the upper support roll 34R
, 34L, the support roll bearing 13 is adapted to slide forward and backward along the guide rail 16.

Lower back up roll unit 30 Work roll 24
The back-up shirt 1-36 is arranged parallel to the roll axis, and has a pair of sabot openings 38R and 381-, which are separated to the left and right in the roll axis direction and have a short body length, to rotate and axially move the back up shirt 1-36. Mounted for sliding movement. The pair of sabot 1-rolls 38R and 381 are rolled into contact with the upper work roll 24, and serve as backup support for the work roll 240 during rolling. Also,
The support rolls 38R, 38L are mounted on the backup shaft 36 via a rotating bearing 40, as shown representatively for the lower unit 1- in FIG.
Further, thrust bearings 42 and 44 are installed on both end faces.

As shown in FIG. 2, bearings 46, 48, 52 are attached to the neck parts of the upper and lower work rolls 22, 24 and the neck part of the backup shaft 36 of the lower back-up roll unit 30, as shown in FIG. are arranged and attached to the housing 20 in tandem. 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.

In such a configuration, the separation support rolls 34R, 34 of the above-mentioned "Nivanquats roll unit 28"
L, and the separation support rolls 38R and 38L of the lower back-up roll unit 30 can each be adjusted in position by moving in the roll axis direction.

For this position adjustment, support rolls 38R and 38L in each unit 30 are engaged with roll guides 56R and 56L as guide members. FIG. 3 shows an example of attachment to the lower backup roll unit 30. As shown in the figure, two guide shafts 58 are installed in parallel with the backup shaft 36, extending between the bearings 52 at both ends of the backup shaft 36.

By attaching the backup shaft 36 and the guide shaft 58 at 7 to a common bearing 52, the parallelism of both shafts 36.degree. 58 is maintained. The roll guides 56R, 56L are attached to the guide shaft 58, and the guide shaft 58 passes through the support rolls 38R, 38I.

Slide casing 6O formed so as not to interfere with
Equipped with R, 60L. And slide gauging 60R, 601, Niba support roll 38R, 381-
Thrust bearings 42.4 extend toward both end surfaces of the rollers 38R and 38L and are attached to both end surfaces of the rolls 38R and 38L.
Slash holding 4;・Bearing shift 62.64
is installed. Thrust hair ring buzzer boat 6
2.64, as shown in FIG. 3(b), is supported by a 1'-oak-shaped holding plate 66 that directly abuts the thrust bearing 42.44, and a bracket 68 that supports and reinforces this from the outside. It is formed. Presser plate 6
6 is passed through the pack-up shirt l-36 so as not to interfere with it. Therefore, each support roll 38R,
38L moves the roll guides 56R, 56L in the axial direction along the guide shaft 58,
The support rolls 38R and 38L can be slid in the axial direction of the backup shaft 36.

Here, the support rolls 34R, 34L.

A driving means for appropriately moving the positions of 38R and 38L is provided for each backup roll unit. A pair of separation support rolls 34R, 34L, 38
The second backup roll unit 28 uses a support roll moving cylinder 14 as a hydraulic drive means, When pressure oil is supplied to the support roll movement cylinder 14a, the pair of support rolls 34R and 34L are separated from each other via the support roll movement cylinder rod 14a, which expands and contracts, or It can be brought closer. In addition, in the lower back-up roll unit 30, the winding transmission device 9
As shown in FIGS. 3(a) and 3(b), a drum 91 as a driving wheel is installed in the center of the upper beam member of the housing 20.
A motor 92 is connected to one end of the .

On the other hand, the guide shaft 58 passes through the slide casings 60R and 60L of the left and right roll guides 56R and 56L, and a screw rod 93 is similarly passed through in parallel with the slide casings 60R and 60L of the left and right roll guides 56R and 56L.
It is rotatably supported. The screw rod 93 has reverse threads cut into the right half and the left half, and a pair of snub nuts 1-94R and 94L are screwed into each of the threaded parts. These sleeve nuts l-94R, 94L are attached to the screw rod through holes in the slide casings 60R, 60L;
Although it is rotatably attached to 60L, it is restrained so that it cannot move in the axial direction. Both sleeve nuts 94R, 94I extend toward the center and protrude from the end faces of the slide casings 60R, 60L.
Pulleys 95R and 95L serving as driven vehicles are integrally formed in this extension. And each of these pulleys 9
5R and 95L have lobes 96R between them and the drum 91.
, 96L are wound around it, and are rotated in accordance with the rotation of the rotary drum 91 driven by a motor. For this reason, each sleeve nut 94R, 94L is rotated, and the force of movement in the direction of approaching or moving away from each other along the threading direction of the screw rod 93 is applied to the slide casing 6.
Give to 0R, 60L. Along with this, the roll guide 56
R, 56L, and a pair of support rolls 38R, 3
8L can be moved away from each other or closer together. Further, a roll bending device 100 is incorporated in the housing 20, and as shown in FIG.
It is composed of an upper roll benzo ink rod 102, a lower roll bending rod 104, a roll bending cylinder 106, and a piston 108.

The lower end of the partial roll bending iron 102 is fixed to the piston 108, and the upper end is arranged to be able to move toward and away from the -L portion work roll bearing 46.

Moreover, 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. cylinder 10
6 is provided with a small diameter communication hole 11O, and when pressure oil is introduced here from a pressure oil supply device (not shown), the roll bending ronds 102, 1.04 are separated from each other, and the upper and lower work rolls 22 .24 of the bearings 46, 4B are pressed toward the backup roll unit 28, 30, respectively.

In addition, liners 112 and 114 are pasted on the sliding surfaces of the roll pending cylinder 106 and the upper and lower work + 1-roll bearings 46 and 48, respectively, and when pressure oil is supplied to the cylinder 106, liners 112 and 114 are applied to the sliding surfaces. The work roll bearing 46
．． 48 is pushed open so that a bending moment can easily be applied using the abutment points between the support rolls 34 and 38 and the work rolls 22 and 24 as fulcrums. This results in 4
, Workroll 22. ．． The work roll rolling surface profile during rolling by 24 is corrected and adjusted to become a flat surface.

As shown in FIG. 5, the rolling cylinder 54 has a built-in head 116, and during rolling, pressure oil is introduced into the rolling cylinder 54 from a pressure oil supply device (not shown), so that the head 116 can be raised to 2. I try to let them do it. The operation of the head 116 pushes the backup shaft bearing 52 of the lower backup roll unit 30, and this rolling blade is connected to the lower sabot I-rolls 38R, 38L, the lower work roll 24, the bearing 48, the roll bending device W100,
The bearing 46 is partially transmitted to the work roll 22, the upper support rolls 34R, 341, the upper back-up shirt 1, the bearing 50, and the housing 20 to generate a desired rolling force.

The operation of the rolling mill configured as described above is as follows.

Before rolling, support rolls 34 are rolled to match the width of the material to be rolled 26.
The positions of R, 34L and 38R, 38L are determined in advance. In this case, the rolling contact position of the support rolls 34, 38 to the work rolls 22, 24 is set to a position where they do not overlap with the material to be rolled 26, but this initial setting is made by first driving the reduction cylinder 54 and moving the lower back-up roll unit. 30 is raised to keep the work rolls 22.24 and support rolls 34.38 in light contact. 7. After that, in order to adjust the W gm of the support rolls 34 and 38, in the upper backup roll unit 28, when pressure oil is supplied to the support roll movement cylinder 14, pressure oil is supplied to the support roll movement cylinder 14Th. The pair of support rolls 34R and 34L are moved away from each other or moved closer to each other. In addition, in the back-up roll unit 30, the rotary drum 9 is rotated in the normal or reverse direction, and the boot IJ95R,
By rotating 95L, it is moved to a preset position. As a result, a pair of support rolls 34
The intervals between R and 34L and between 38R and 38L are set to desired intervals. In this state each support roll is 34.38
The contact position will be out of the rolling area of the rolled material 26.)
It is to make it.

After completing this initial setting, the Boo-Crawl 22°2
The material to be rolled 26 is passed between the four spaces. As a result, the rolled material 2
6 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 upper back-up roll unit 28 adjusts the pressure oil to the support roll moving cylinder 14, and the lower back-up roll unit 30 adjusts the pressure oil to the housing 20. Rotate the attached rotating drum 9J and tighten the sleeve nuts 94R, 9.
Rotate 4L or screw rod 93. By this operation, the paired sabot I rolls 34R, 34L and 38R, 387 are moved closer to each other or farther apart, so the work roll 2
By adjusting the amount of bending moment acting on 2.24, it is possible to suppress the occurrence of shape abnormalities and obtain a rectangular strip material.

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

Figure 6 shows a roll diameter of 600 mm, rolling force of 600 tons,
The change in the profile of the upper work roll 22 is shown when the distance between the support rolls is set to 1400 mm and the roll pending force is adjusted to 25 tons.

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

As can be understood from this result, it is possible to arbitrarily change the amount of deflection of the work roll by changing the roll pending force and the position of the sabot roll, thereby making it possible to adjust the cross section of the strip material. therefore,
It is possible to have a crown control ability that allows shape control over a wide range.

In the above embodiment, the wrapping means is constituted by a robe, but it goes without saying that a belt, chain, etc. can also be used.

〔Effect of the invention〕

As explained above, according to the present invention, crown control can be performed quickly and over a wide range by arbitrarily changing the 11 parts of the hack-up bow of the work roll, making it extremely easy to modify the product shape. It can be realized.

In particular, in the present invention, the distance between the pair of separation rolls can be adjusted by providing a hydraulic drive means having a telescoping rod that extends and contracts in the axial direction of the work rolls to move the position of the separation sabot I roll that serves as a backup during rolling. At the same time, since this is performed by a winding transmission and the interval between the pair of coaxially arranged separation rolls can be adjusted, the position can be moved accurately. Furthermore, since the moving speed can be increased, the shape correction function can be performed quickly, and crown control can be performed using precise position control. Furthermore, the drive section of the wrap transmission device can be installed at any location by extending the wrap means, and this structure is particularly effective when there is a height restriction.

[Brief explanation of the drawing]

FIG. 1 is a front view of the rolling mill according to the embodiment, FIG. 2 is a side view thereof, FIG. 3(a) is an enlarged sectional view of the main part of the upper sabot 1-roll section, and Side sectional view of (a), 4th
The figure is a cross-sectional view of the roll bending device, Figure 5 is a cross-sectional view of the housing in which the bearing of the rolling mill is installed, Figures 6 and 7 are characteristic diagrams of the amount of roll deflection as the support roll moves, and Figure 8 is a cross-sectional view of the roll bending device. The figure is a front view of a conventional 4-high rolling mill.
The figures are the same side view, Figure 1O is a sectional view of the main part of the housing in which the bearing of the rolling mill is installed, Figure 11 is a sectional view of the roll bending device, Figure 12 is a schematic diagram showing roll deflection, and Figure 13. is the diagram 13 of the increasing and decreasing state of crown...
・Support roll bearing, 14... Cylinder for supporting roll movement, 20... Housing, 22° 24...
Work roll, 26...Rolling machine, 28°30...
Pasoku up roll unit), 36... Backup shaft, 34R, 34L, 38R, 38L... Zapo 1-roll, 40... Rotating bearing, 42.44
... Thrust 1-Bearing, 46, 48° 52...
Bearing, 54... Reduction cylinder, 56R, 56■7...
・Roll guide, 58...Guide shaft, 60...
・Slide casing, 90... winding transmission means,
91...Rotating drum (driver), 92...Motor,
93...Suflip 4 Urod, 95 R, 95L...
・Pulley, 96R, 96L... Lobe, 100...
Roll bending equipment. Figure 3 (b) Figure 9 = ・ // // Figure 10'''L 13 (a) (b)

Claims (1)

[Scope of Claims] A pair of work rolls that roll down a rolled material, and a pair of backup rolls that roll into contact with each work roll, bearings at both ends of each roll are attached to a housing, and a bearing between the pair of work rolls is provided. In a rolling mill in which a pressurizing means for adjusting the interval and controlling the crown is incorporated in the housing, one backup roll is formed from a pair of support rolls with a short body length, and a holder for rotatably holding the support rolls. a pair of hydraulic drive means having a telescoping rod extending and contracting in the axial direction of the work roll facing the material to be rolled is provided in the housing, and one end of the holding member is attached to the tip of the piston rod. In addition to being fixedly supported and slidably supported in the axial direction, the roll interval of the support rolls can be adjusted, and furthermore, the other backup roll is formed by a pair of support rolls with a short body length separated in the roll axis direction. The separation support roll is configured to be attached to a backup shaft that supports the separation support roll rotatably and slidably in the axial direction, and is movably attached to a guide shaft disposed parallel to the backup shaft and attached to the separation roll main body. Attaching the engaging guide member,
A pair of guide members are connected to each other by threading screw rods having opposite threads to each other, and a driven vehicle is attached to either the pair of guide members or the screw rod,
A driving wheel is attached to the fixed side of the housing, etc., and rotation can be transmitted between the driven wheel and the driving wheel via a winding means such as a belt, so that the interval between the separation rolls disposed on the same axis can be adjusted. rolling mill.