JPH105808A - Rolling method and rolling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrict the generation and diffusion of camber of a rolling steel, to prevent meandering during rolling, and to improve the stable operation of a rolling line and the quality of the rolling steel by detecting the off-center amount during rolling and moving roll chocks to the horizontal direction. SOLUTION: This controller 11 outputs the command to cross-blocks 5a, 5b, 5c, and 5d and hydraulic draft devices 3a and 3b so that a moving amount in the horizontal direction and a corrective amount of draft positions of the driving side and the operating side calculated with an arithmetic processor 12 can be obtained. The difference distribution of width direction thickness (crown) can be controlled during rolling by respectively and individually driving roll chocks 2a, 2b, 2c and 2d of the operating side and the driving side of the upper and lower work rolls 1a, 1b to the horizontal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling method and a rolling system, and more particularly to a rolling method using a rolling mill having a mechanism for moving upper and lower roll chocks in a horizontal direction and intersecting the upper and lower rolls, and the rolling mill. The present invention relates to a rolling system provided with:

[0002]

2. Description of the Related Art During rolling, it is desirable that the traveling direction of a rolled material be parallel to a rolling line, but in practice, often,
For example, a meandering occurs in which the traveling direction of the rolled material shifts in the horizontal direction due to, for example, camber (sheet bending). As an effective means for preventing meandering, rolling under conditions that give a convex crown to a rolled material is effective. However, in recent years, the demand for a rolled material having a uniform thickness in both the rolling direction and the width direction has been increased as much as possible while reducing the convex crown of the plate as much as possible.In recent years, meandering of the rolled material has occurred, which is a major obstacle to improving the yield. I have.

The causes of meandering are various asymmetries between the working side and the drive side of a rolling mill and a rolled material. The main causes are a difference in mill rigidity, a difference in roll opening, a difference in plate thickness on an entrance side, and a difference in plate thickness. There are a temperature difference and a deviation (off-center) between the center of the plate and the center of the rolling mill.

In Japanese Patent Publication No. 6-65404, the meandering is prevented by detecting the camber amount of the plate material, correcting the reduction amount on the working side and the driving side, and adjusting the roll opening.

In Japanese Patent Application Laid-Open No. 6-91314,
In a thick plate reversible rolling mill having a mechanism for moving the upper and lower roll chocks in the horizontal direction and intersecting the upper and lower rolls, at the initial setting for each pass, the left and right plate thickness of the rolled material is measured and the upper and lower left and right are measured. The camber is suppressed by moving the four roll chocks independently in the traveling direction of the rolled material and moving the cross point of the upper and lower rolls.

Further, in Japanese Patent Application Laid-Open No. 7-171608, in a cross rolling mill in which upper and lower work rolls are provided with a cross mechanism, as a setting item of an off-center amount between a cross point and a center of a mill or a center of a plate, By controlling the cross angle of the upper and lower work rolls to be shifted, meandering of the rolled material and single gauge are prevented.

[0007]

The difference between the right and left mill stiffness is the difference between the working side and the driving side (wedge) in the exit side plate thickness after rolling even when rolling is performed in a state where the cross section of the input side plate is rectangular and the off center is zero. Occurs, a difference in elongation occurs in the rolling direction of the rolled material, plate bending occurs, and the rolled material meanders. The roll opening difference between the left and right rolls is initially set to cause a difference between the working side and the drive side due to some cause, similar to the result of the difference in mill rigidity, a difference in elongation occurs in the rolling direction of the rolled material, plate bending occurs, and Meanders. Even if the left and right mill stiffness differences are 0 and the left and right roll opening differences are 0, the difference in the rolling reduction between the working side and the drive side occurs, and the rolled material is rolled. A difference in elongation occurs in the direction, the sheet bends, and the rolled material meanders. The sheet temperature difference causes a difference in the deformation resistance between the working side and the driving side of the rolled material. Even if the difference between the right and left mill stiffness is 0 and the difference between the left and right roll opening degrees is 0, the working side and the driving side are different. A difference occurs in the rolling reduction of the rolled material, a difference in elongation occurs in the rolling direction of the rolled material, plate bending occurs, and the rolled material meanders. Furthermore, in the case where the rolled material bites while the off-center is generated, a wedge occurs in the rolled material, plate bending occurs, and the rolled material meanders, even if symmetry is maintained under any other conditions.

FIG. 14 shows the occurrence of wedges during rolling, camber and meandering. As shown in FIG.
When a rolled material having a rectangular cross section and no camber is rolled before rolling, and the rolled material shifts to the working side (WS) due to the above-described factors, the rolled material after rolling is processed as shown in FIG. It is rolled into a thick, curved WS shape. Conversely, when it is shifted to the driving side (DS), the rolled material after rolling is rolled into a DS-thick and DS-curved shape as shown in FIG.

As described above, when the rolled material is shifted to the working side or the drive side immediately below the roll and the off-center occurs, at least one of the wedge and the camber is generated in the outgoing rolled material.

As means for controlling at least one of the wedge and the camber of the rolled material during rolling, Japanese Patent Publication No.
There is a modification of the rolling position setting as disclosed in Japanese Patent No. 404.
However, the correction of the rolling position setting controls the meandering of the rolled material, but interferes with the thickness control and the width direction thickness difference distribution (crown) control, deteriorating the quality of the rolled material after rolling, or
If the control method is not appropriate, the rolled material will have WS and D just below the roll.
There is a problem that an unstable phenomenon that oscillates in S, or that the meandering is directed in the diverging direction due to inadequate control, resulting in an accident such as narrowing down.

On the other hand, in JP-A-6-91314,
At the time of initial setting for each pass, the thickness of the left and right sides of the rolled material is measured, and the four upper, lower, left and right roll chocks are independently moved in the traveling direction of the rolled material, and the cross point of the upper and lower rolls is moved, thereby reducing the camber. Restrained. But,
In this method, the cross point is moved at the initial setting of each pass, that is, before the rolled material is engaged, and the thickness and off-center amount of the rolled material are measured during rolling (rolling) of the rolled material. Then, the cross point of the upper and lower rolls is fixed, and the setting of the left and right rolling position is corrected. Therefore, when a camber occurs during rolling or when this method is applied to a material whose wedge changes in the rolling direction, the same problem as that of the above-described related art (Japanese Patent Publication No. 6-65404) occurs. Also, in Japanese Unexamined Patent Application Publication No. 7-171608, meandering and one-sided gauge of the rolled material are prevented by controlling the cross angle of the upper and lower work rolls to be shifted. In this method, as a result, the cross point of the upper and lower rolls moves in two directions: the rolling direction and the direction perpendicular to the rolling direction. As described above, in this conventional technique, the cross angle of the upper and lower work rolls changes and the cross point also moves in the rolling direction, so that it interferes with the thickness control and the width-direction thickness difference distribution (crown) control, and a desired thickness is obtained. Can not be obtained.

An object of the present invention is to suppress the occurrence and divergence of rolled material camber, to prevent meandering during rolling, without interfering with thickness control and width direction thickness difference distribution (crown) control. An object of the present invention is to provide a rolling method and a rolling system capable of stably operating a line and improving the quality of a rolled material.

[0013]

[Means for Solving the Problems]

(1) In order to achieve the above object, the present invention relates to a rolling method using a two or more-stage rolling mill having a mechanism for moving upper and lower roll chocks in a horizontal direction and intersecting upper and lower rolls. The off-center amount of the rolled material with respect to the center of the rolling mill immediately below the roll of the rolling mill is detected. Based on the off-center amount, the cross point of the center axis of the upper and lower rolls is perpendicular to the rolling direction, and the cross point and the rolled material are determined. It is assumed that the roll chock is moved in the horizontal direction so as to move in a direction in which the distance from the center becomes smaller.

In the present invention constructed as described above, since the cross point of the upper and lower rolls moves only in the direction perpendicular to the rolling direction, the thickness control and the thickness difference distribution (crown) in the width direction are performed.
The occurrence and divergence of the camber of the rolled material can be suppressed without interfering with the control, and meandering during rolling can be prevented.

(2) To achieve the above object,
The present invention moves the upper and lower roll chocks horizontally,
In a rolling method using two or more reverse rolling mills having a mechanism for crossing the upper and lower rolls, during rolling, an off-center amount of a rolled material with respect to the center of the rolling mill immediately below the rolls of the rolling mill is detected. Based on quantity
The roll chocks are moved horizontally so that the cross point of the center axis of the upper and lower rolls is perpendicular to the rolling direction and the distance between the cross point and the center of the rolled material is reduced.

In the present invention constructed as described above, the cross point of the upper and lower rolls moves only in a direction perpendicular to the rolling direction. The occurrence and divergence of the camber of the rolled material can be suppressed without interfering with the thickness difference distribution (crown) control, and meandering during rolling can be prevented.

(3) Further, in order to achieve the above object, the present invention arranges at least two rolling mills of two or more stages having a mechanism for moving upper and lower roll chocks in a horizontal direction and intersecting upper and lower rolls. In a rolling method using a tandem rolling mill, during rolling, an off-center amount of a rolled material with respect to the center of the rolling mill immediately below a roll of at least one rolling mill is detected, and based on the off-center amount, the upper and lower rolls are determined. The cross point of the center axis is perpendicular to the rolling direction,
The roll chock is moved horizontally so that the distance between the cross point and the center of the rolled material decreases.

In the present invention constructed as described above, since the cross point of the upper and lower rolls moves only in the direction perpendicular to the rolling direction, a tandem rolling mill having at least two rolling mills of two or more stages is used. In, without interfering with the thickness control and width direction thickness difference distribution (crown) control,
Generation and divergence of camber of the rolled material can be suppressed, and meandering during rolling can be prevented.

(4) In the above (1) to (3), preferably, the horizontal movement of the roll chocks does not change the cross angles of the upper and lower rolls with respect to the center line of the rolling mill perpendicular to the rolling direction. Do as follows.

As a result, since the cross angle between the upper and lower rolls does not change, the thickness control and the thickness difference distribution (crown) in the width direction are performed.
Interference with control can be more reliably prevented.

(5) To achieve the above object,
The present invention relates to a rolling method using a two or more-stage rolling mill having a mechanism for moving upper and lower roll chocks in a horizontal direction while maintaining upper and lower rolls in a parallel state. The off-center amount of the material with respect to the center of the rolling mill is detected, and based on the off-center amount, the cross point between the center line of the rolling mill perpendicular to the rolling direction and the center axis of the upper and lower rolls is used as the cross point and the center of the rolled material. The roll chock is moved in the horizontal direction so as to move in a direction in which the distance from the roll chock becomes smaller.

In the present invention constructed as described above, since the cross point between the center line of the rolling mill and the center axis of the upper and lower rolls moves only in a direction perpendicular to the rolling direction, the upper and lower rolls are kept parallel. In a machine using two or more moving rolling mills, the generation and divergence of the rolled material is suppressed without interfering with the control of the thickness and the control of the thickness difference distribution (crown) in the width direction. Can be prevented.

(6) In the above (1) to (5), preferably, before the rolled material is engaged, the off-center amount of the rolled material with respect to the center of the rolling mill is detected, and based on the off-center amount, the vertical direction is determined. The roll chocks are moved horizontally so that the cross point of the center axis of the roll is perpendicular to the rolling direction and the distance between the cross point and the center of the rolled material is reduced.

Thus, since the movement of the cross point is controlled even before the rolled material bites, the cross point is more effectively controlled without interfering with the control of the thickness and the control of the thickness difference distribution (crown) in the width direction. Generation and divergence of camber can be suppressed, and meandering during rolling can be prevented.

(7) To achieve the above object,
The present invention moves the upper and lower roll chocks horizontally,
In a rolling system including two or more rolling mills having a mechanism for intersecting upper and lower rolls, a first detecting unit for detecting an off-center amount of a rolled material with respect to a center of the rolling mill immediately below a roll of the rolling mill during rolling. Based on this off-center amount, the roll chocks are moved horizontally so that the cross point of the center axis of the upper and lower rolls is perpendicular to the rolling direction and the distance between the cross point and the center of the rolled material is reduced. And a first calculating means for controlling.

(8) In order to achieve the above object,
The present invention moves the upper and lower roll chocks horizontally,
In a rolling system including two or more reverse rolling mills having a mechanism of crossing upper and lower rolls, a first detecting means for detecting an off-center amount of a rolled material with respect to a center of the rolling mill immediately below a roll of the rolling mill during rolling. Based on the off-center amount, the cross point of the center axis of the upper and lower rolls is perpendicular to the rolling direction, and the roll chock is moved horizontally so that the distance between the cross point and the center of the rolled material is reduced. And a first calculating means for controlling the movement. (9) In order to achieve the above object, the present invention provides a tandem rolling machine in which two or more rolling mills having a mechanism for moving upper and lower roll chocks in a horizontal direction and intersecting upper and lower rolls are arranged. Detecting means for detecting an off-center amount of a rolled material immediately below a roll of at least one rolling machine with respect to the center of the rolling mill during rolling, and based on the off-center amount, A first arithmetic means for controlling the horizontal movement of the roll chock so that the cross point of the center axis of the roll is perpendicular to the rolling direction and the distance between the cross point and the center of the rolled material is reduced. And

(10) In the above items (7) to (9), preferably, the first arithmetic means is configured such that a cross angle of the upper and lower rolls with respect to a rolling mill center line perpendicular to a rolling direction is:
The roll chock is controlled to move in the horizontal direction so as not to change.

(11) In order to achieve the above object, the present invention comprises two or more rolling mills having a mechanism for moving upper and lower roll chocks in a horizontal direction while keeping upper and lower rolls in a parallel state. Detecting means for detecting an off-center amount of a rolled material with respect to a center of a rolling mill immediately below a roll of a rolling mill during rolling, based on the off-center amount, a rolling mill center line perpendicular to a rolling direction. And a first calculating means for controlling the horizontal movement of the roll chock so that the cross point of the central axis of the upper and lower rolls with respect to the horizontal direction moves in a direction in which the distance between the cross point and the center of the rolled material decreases. .

(12) In the above (7) to (11),
Preferably, before the rolled material is engaged, a second detecting means for detecting an off-center amount of the rolled material with respect to the center of the rolling mill, and based on the off-center amount, the cross point of the center axis of the upper and lower rolls is rolled. Second calculating means for controlling the horizontal movement of the roll chock so as to move in a direction perpendicular to the direction and in a direction in which the distance between the cross point and the center of the rolled material is reduced.

[0030]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Basic Embodiment) First, a basic embodiment of the present invention will be described with reference to FIGS.

Referring to FIGS. 1 and 2, a rolling system according to the present embodiment includes upper and lower work rolls 1a and 1b positioned above and below a rolled material 10 for rolling, and upper and lower drive sides for fixing the positions of these work rolls. And work side roll chock 2
a, 2b, 2c, and 2d; drive-side and work-side hydraulic pressure reduction devices 3a and 3b for setting the vertical position of these roll chocks; and drive-side and work-side load meters 4a for measuring the rolling load of the rolling mill. , 4b and cross blocks 5a, 5b, 5c for setting the horizontal position of the roll chocks
And 5d, a thickness gauge 6 located on the rolled material entry side, a thickness gauge 8 and a camber meter 9 located on the rolled material exit side, hydraulic pressure reduction devices 3a and 3b, and cross blocks 5a, 5b, 5c.
And a load cell 4a for issuing a command to the
, 4b, the thickness gauges 6 and 8, and the camber meter 9 to calculate and send a command value to the controller 11.

The rolling system shown in FIG. 1 can impart an arbitrary angle to the upper and lower work rolls 1a and 1b by horizontally moving the cross blocks 5a, 5b, 5c and 5d.

FIG. 3 shows the positional relationship between the rolls and the rolled material when the cross angle is given to the upper and lower work rolls 1a and 1b. According to the present invention, when only the OC is off-centered on the driving side of the rolling mill due to factors such as a difference in mill rigidity or a difference in roll opening or a difference in sheet thickness or a difference in sheet temperature between the working side and the driving side of the rolled material 10, The cross point of the upper and lower work rolls is moved by OC.

In FIG. 3, work roll chock 2
a, 2b, 2c and 2d horizontal movement amounts CSUD, CSL
If D, CSUW and CSLW are all equal, the upper and lower cross angle θ
U and θL are also equal, and the upper and lower work rolls 1a, 1a are positioned at the center L / 2 of the distance L between the drive side and the work side.
b intersects.

Here, if a difference is made between the moving amounts CSUD and CSLD of the upper and lower roll chocks on the driving side and the moving amounts CSUW and CSLW of the upper and lower roll chocks on the working side, the upper and lower work rolls 1a and 1b are generated. A difference can be generated between the cross angles θU and θL. Further, the movement amounts of the upper roll chock on the drive side and the work side are CSUD and CSUW, or the movement amounts of the lower roll chock on the drive side and the work side are CSLD and CSS.
If there is a difference in LW, the upper and lower work rolls 1a, 1b
From the position of the center L / 2 of the distance L between the drive side and the work side of the roll chock from the center side of the rolled material, the exit side (rolling direction), the driving side, and the working side (direction perpendicular to the rolling direction). Can be moved to a position.

At this time, in order to avoid interference with the thickness control and the width direction thickness difference distribution (crown) control, the cross point is moved only in the direction perpendicular to the rolling direction and the cross angles θU and θL are changed. (ΘU = −θL), and for this purpose, the control may be performed by giving the relationship of CSUD = −CSLD, CSUW = −CSLW to the upper and lower roll chock movement amounts. ("-" In the formula means that the moving direction is opposite.) Also, by operating the drive side and work side hydraulic pressure reduction devices 3a and 3b, the upper and lower roll chocks on the drive side and the work side are operated. The vertical center distances SDS and SWS are changed, and the vertical center distances SBDS and SBWS of the work rolls 1a and 1b above and below the rolled material edge.
Can be set to a desired distance.

The upper and lower work rolls 1a, 1b shown in FIG.
Equation (1) expresses the relationship between the cross angles θU, θL of each work roll and the horizontal movement amounts CSUD, CSLD, CSUW, CSLW of each work roll chock.
To (4). Also, the work roll horizontal displacement amount CBUD, CBLD, CBW, CB of the rolled material edge at that time.
LW can be expressed by equations (5) and (6).

[0039]

(Equation 1)

Here, L is the distance between the drive side and the work side roll chocks, B is the rolled material width, OC is the off-center amount, that is, the center of the rolling mill of the rolled material 10 immediately below the work roll (between the drive side and the work side roll chocks). Center L of distance L
/ 2 position).

The distance SBDS, SBWS between the vertical axes of the upper and lower work rolls at the edge of the rolled material can be expressed by equations (7) and (8), and the upper and lower work roll gaps GBDS, GBWS at the edge of the rolled material are Expressions (9) and (10) can be used.

[0042]

(Equation 2)

Here, SDS and SWS are the actual values of the distance between the vertical axes of the upper and lower roll chocks on the driving side and the working side, and are usually SDS = SWS = SBDS = SBWS. DR is the average diameter of the upper and lower work rolls.

The rolling system according to the present embodiment measures the wedge and the camber after rolling by using the exit side thickness gauge 8 and the camber gauge 9, and calculates the off-center amount OC of the rolled material 10 between the upper and lower work rolls 1a and 1b. By estimating and moving the cross point of the upper and lower work rolls 1a and 1b by a value equal to the off-center amount OC of the rolled material 10 in a direction perpendicular to the rolling direction, the generation of camber and wedges of the rolled material 10 is suppressed. Is to control the meandering.

FIG. 4 shows a calculation flow performed by the arithmetic processing unit 12 at this time. FIG. 5 shows specifications used for the calculation.

In FIG. 4, the outlet thickness W is measured from the outlet thickness gauge 8.
Measure the S plate thickness hW and the exit side DS plate thickness hD,
Or, calculate the average thickness hO of the entrance side from the thickness setting of the previous pass,
From the constant volume condition, the in-rolled material length l0 is determined as the sheet width is invariable, and the outgoing WS-rolled material length lW,
The exit side DS rolled material length ID is calculated.

Next, the difference Δr of the rolling reduction between WS and DS is calculated using the equation (12). This reduction ratio difference Δr or the exit side WS rolled material length lW, the exit side DS rolled material length ID and the sheet width B
Assuming that the camber of the rolled material on the exit side is a circular arc, the camber curvature 1 / R is obtained by the equation (13) (step 100). At this time, the off-center amount OC immediately below the roll is obtained from the off-center amount OS immediately below the camber meter measured by the exit camber meter 9 using equation (14) (step 110).

[0048]

(Equation 3)

Here, rW and rD are the reduction ratios of WS and DS, r is the average reduction ratio, lS is the distance from immediately below the roll to the outlet camber meter 9, and OS is the rolled material edge immediately below the outlet camber meter. Distance from the center of the rolling mill.

The off-center amount OC obtained in this manner
By substituting into equations (1) to (4), the horizontal movement amounts CSUD, CSLD, CSU of each work roll chock.
W and CSLW are calculated (step 120).

At this time, the rolling system shown in FIG. 1 sets the cross angles θU and θL of the upper and lower work rolls 1a and 1b to appropriate values to control the thickness difference distribution (crown) in the width direction. As the cross angles θU and θL in (1) to (4), values set in this crown control are input.

Next, the exit side WS plate thickness hW and the exit side DS plate thickness hD
From the drive side and the working side are calculated (13)
0).

The horizontal movement amounts CSUD, CSLD, CSUW, CSLW of the work roll chock and the correction amounts of the drive-side and work-side pressing positions determined as described above are output to the controller 11 (step 140).

The controller 11 controls the cross blocks 5a, 5b, 5c and 5d so as to obtain the horizontal movement amounts CSUD, CSLD, CSUW, CSLW calculated by the arithmetic processing unit 12 and the correction amounts of the pressing positions on the driving side and the working side. And outputs a command to the hydraulic pressure reduction devices 3a and 3b.

In the embodiment constructed as described above, the work chocks 2a, 2b, 2c and 2d on the working side and the drive side of the upper and lower work rolls 1a and 1b are each independently driven in the horizontal direction to perform rolling. The width direction thickness difference distribution (crown) can be controlled. Also,
In order to suppress meandering due to the off-center of the rolled material, the cross point of the upper and lower work rolls is perpendicular to the rolling direction, and the roll chock is moved horizontally so that the cross point moves in the direction coinciding with the center of the rolled material. The horizontal movement of the roll chocks is performed so that the cross angles of the upper and lower work rolls with respect to the center line of the rolling mill perpendicular to the rolling direction do not change, respectively, so that the width symmetry of the working side and the drive side as viewed from the center of the rolled material. , And rolling that suppresses the divergence of meandering of the rolled material can be performed, and disturbance to the thickness control and the crown control can be reduced.

When the rolled material is a wedge material on the exit side of the rolling mill, the wedge can be reduced by modifying the roll rolling position setting. In other words, the meandering control is performed by moving the cross point, the wedge control is performed by modifying the draft setting, and the function of controlling the camber and the wedge can be shared. And product quality can be greatly improved.

(Embodiment of Reverse Rolling Mill) An embodiment in which the present invention is applied to a reverse rolling mill will be described with reference to FIGS. 6 and 7. FIG.

In FIG. 6, the rolling system of the present embodiment includes upper and lower work rolls 1a and 1b positioned above and below a rolled material 10 for rolling, and these upper and lower work rolls 1a.
And 1b. Similarly to the above-described basic embodiment, the positions of the upper and lower work rolls 1a and 1b are fixed by upper and lower drive and work side roll chocks 2a, 2b, 2c and 2d (see FIG. 1). Are located on the drive side and the working side hydraulic pressure reduction devices 3a and 3b.
The horizontal position of the roll chocks is set by the cross blocks 5a, 5b, 5c and 5d (see FIG. 1).
(See FIG. 1). The positions of the upper and lower reinforcing rolls 13a and 13b are fixed by upper and lower driving and working side roll chocks (not shown).

The rolling system according to the present embodiment, like the basic embodiment, includes a thickness gauge 6 on the rolled material entry side, a thickness gauge 8 and a camber meter 9 on the rolled material exit side, a controller 11, a processing unit, 12 and a camber meter 7 on the rolled material entry side, and this measured value is also input to the arithmetic processing unit 12.

The positional relationship between the roll and the rolled material when the cross angle is given to the upper and lower work rolls 1a and 1b is the same as in the basic embodiment described with reference to FIG. = −CSLD, CSUW = −CSLW, the cross point is moved only in the direction perpendicular to the rolling direction and the cross angles θU and θL are kept unchanged, and the thickness control and width direction plate are controlled. Interference with thickness difference (crown) control can be avoided. By operating the hydraulic pressure reduction devices 3a and 3b on the driving side and the working side, the vertical center distance between the upper and lower roll chocks of the upper and lower reinforcing rolls 13a and 13b in the vertical direction can be reduced to a desired distance. Set the upper and lower work rolls 1a, 1
The distances SBDS and SBWS between the axes in the vertical direction b can be set to a desired distance.

The relationship between the cross angles θU, θL of the upper and lower work rolls 1a, 1b and the horizontal movement amounts CSUD, CSLD, CSUW, CSLW of the respective work roll chocks are expressed by equations (1) to (4). The work roll horizontal displacement amounts CBUD, CBLD, CBUW, and CBLW at the edge of the rolled material at this time are expressed by Expressions (5) and (6).

Further, the distances SBDS and SBWS between the vertical axes of the upper and lower work rolls at the edge of the rolled material are calculated by adding a correction number to the equations (7) and (8) in consideration of the gap between the work roll and the reinforcing roll. The upper and lower work roll gaps GBDS and GBWS at the edge of the rolled material can be expressed by adding the correction numbers to the equations (9) and (10).

The rolling system according to the present embodiment measures the wedge and the camber after rolling using the entrance thickness gauge 6 and the camber gauge 7 or the exit thickness gauge 8 and the camber gauge 9 according to the pass direction. The off-center amount OC of the rolled material 10 between the rolls 1a and 1b is estimated, and the cross point of the upper and lower work rolls 1a and 1b is moved in a direction perpendicular to the rolling direction by a value equal to the off-center amount OC of the rolled material 10. The purpose is to suppress the occurrence of camber and wedges of the rolled material 10 and control the meandering of the rolled material. The calculation flow performed by the arithmetic processing unit 12 at this time is the same as that shown in FIG. FIG. 6 shows the upper and lower work rolls 1a, 1
The cross angle is given to b, and the rolled material 10 after one pass rolling changes the traveling direction and is rolled.

FIG. 7 shows the camber amount for each pass in comparison with the conventional method in which the rolling position is corrected. In both the conventional method and the present invention, camber hardly occurs in the first and second passes. However, in the conventional method, camber occurs in the third and fourth passes and almost diverges in the fifth pass. As described above, in the conventional method, since the work rolls are crossed, the off-center of the plate is not completely corrected only by correcting the rolling position on the driving side and the working side, and a large camber may occur in the downstream path. there were. On the other hand, in the present invention, it is possible to suppress or correct the occurrence of camber even in the downstream path.

According to the present embodiment, in a rolling system having a reverse rolling mill, the occurrence and divergence of the camber of the rolled material can be suppressed without interfering with the control of the sheet thickness and the control of the thickness difference distribution (crown) in the width direction. Prevent rolling meandering,
The stable operation of the rolling line and the quality improvement of the rolled material can be achieved.

In this embodiment, even if a winding device is provided on the entrance and exit of the rolling mill, the essence is not different.

(Embodiment of Tandem Rolling Machine) An embodiment in which the present invention is applied to a tandem rolling mill will be described with reference to FIG. In the case of this embodiment, the present invention is applied to the third stand from the front of the finishing tandem rolling mill.

In FIG. 8, the rolling system according to the present embodiment comprises an F3 stand in which the upper and lower work rolls 1a and 1b positioned above and below the rolled material 10 for rolling, and the upper and lower work rolls 1a and 1b for supporting the upper and lower work rolls 1a and 1b. Reinforcing roll 1
3a and 13b. Also, as in the above-described basic embodiment, the positions of the upper and lower work rolls 1a and 1b are determined by the upper and lower drive chocks 2a, 2b, and 2c.
And 2d (see FIG. 1), the vertical positions of these roll chocks are set by hydraulic pressure reduction devices 3a and 3b (see FIG. 1) on the driving side and the working side, and the horizontal position of the roll chocks is determined by the cross block 5a. , 5b,
5c and 5d (see FIG. 1). The positions of the upper and lower reinforcing rolls 13a and 13b are fixed by upper and lower driving and working side roll chocks (not shown).

The rolling system according to the present embodiment has a thickness gauge 6 on the rolled material entry side, a thickness gauge 8 and a camber meter 9 on the rolled material exit side, a controller 11, a processing unit, 12 are provided. However, the role of the wedge measurement of the thickness gauge 6 located on the entry side may be detected by the load difference between the drive side and the work side in the F2 stand. Further, the role of the wedge measurement of the thickness gauge 9 located on the output side may be detected by the load difference between the driving side and the working side in the F4 stand.

The positional relationship between the roll and the rolled material when the cross angle is given to the upper and lower work rolls 1a and 1b is the same as that of the basic embodiment described with reference to FIG. = −CSLD, CSUW = −CSLW, the cross point is moved only in the direction perpendicular to the rolling direction and the cross angles θU and θL are kept unchanged, and the thickness control and width direction plate are controlled. Interference with thickness difference (crown) control can be avoided. By operating the hydraulic pressure reduction devices 3a and 3b on the driving side and the working side, the vertical center distance between the upper and lower roll chocks of the upper and lower reinforcing rolls 13a and 13b in the vertical direction can be reduced to a desired distance. Set the upper and lower work rolls 1a, 1
The distances SBDS and SBWS between the axes in the vertical direction b can be set to a desired distance.

The relationship between the cross angles θU, θL of the upper and lower work rolls 1a, 1b and the horizontal movement amounts CSUD, CSLD, CSUW, CSLW of the respective work roll chocks is expressed by equations (1) to (4). The work roll horizontal displacement amounts CBUD, CBLD, CBUW, and CBLW at the edge of the rolled material at this time are expressed by Expressions (5) and (6).

Further, the distance SBDS, SBWS between the vertical axes of the upper and lower work rolls at the edge of the rolled material is obtained by adding a correction number in consideration of the gap between the work roll and the reinforcing roll to equations (7) and (8). The upper and lower work roll gaps GBDS and GBWS at the edge of the rolled material can be expressed by adding the correction numbers to the equations (9) and (10).

The rolling system of the present embodiment measures the wedge and the camber after rolling by using the exit side thickness gauge 8 and the camber gauge 9, and calculates the off-center amount OC of the rolled material 10 between the upper and lower work rolls 1a and 1b. By estimating and moving the cross point of the upper and lower work rolls 1a and 1b by a value equal to the off-center amount OC of the rolled material 10 in a direction perpendicular to the rolling direction, the generation of camber and wedges of the rolled material 10 is suppressed. Is to control the meandering. The calculation flow performed by the arithmetic processing unit 12 at this time is the same as that shown in FIG.

According to the present embodiment, in a rolling system having a tandem rolling mill, the occurrence and divergence of the camber of the rolled material can be suppressed without interfering with the control of the sheet thickness and the control of the thickness difference distribution (crown) in the width direction. Prevent rolling meandering,
The stable operation of the rolling line and the quality improvement of the rolled material can be achieved.

(Embodiment in the case where off-center occurs before biting of rolled material) Example in which the present invention is applied to control in the case where off-center occurs before biting of rolled material 9 and FIG. In the present embodiment, if an off-center occurs before the rolled material bites, the cross point is moved by the off-center amount and the rolled material is bitten.

In FIG. 9, the rolling system according to the present embodiment includes work rolls 1a and 1b, upper and lower drive chocks 2a, 2b and 2c, similarly to the basic embodiment.
And 2d, hydraulic pressure reduction devices 3a and 3b on the driving side and the working side
(See FIG. 1), load cells 4a and 4b on the drive side and the work side
(See FIG. 1), cross blocks 5a, 5b, 5c and 5
d, thickness gauge 6 on the rolled material entry side, thickness gauge 8 and camber meter 9 on the rolled material exit side, controller 11, arithmetic processing unit 12
And

The rolling system according to the present embodiment also has a camber meter 7 on the rolled material entry side, and the measured value is also input to the arithmetic processing unit 12.

The positional relationship between the rolls and the rolled material when the cross angle is given to the upper and lower work rolls 1a and 1b is the same as that of the basic embodiment described with reference to FIG. = −CSLD, CSUW = −CSLW, the cross point is moved only in the direction perpendicular to the rolling direction and the cross angles θU and θL are kept unchanged, and the thickness control and width direction plate are controlled. Interference with thickness difference (crown) control can be avoided. By operating the hydraulic pressure reduction devices 3a and 3b on the drive side and the work side, the vertical center distances SDS and SWS of the upper and lower roll chocks on the drive side and the work side are changed, and the upper and lower sides of the rolled material edge are changed. The distance SBDS and SBWS between the center axes of the work rolls 1a and 1b in the vertical direction can be set to a desired distance.

The relationship between the cross angles θU and θL of the upper and lower work rolls 1a and 1b and the horizontal movement amounts CSUD, CSLD, CSWW and CSLW of each work roll chock are expressed by equations (1) to (4). The work roll horizontal displacement amounts CBUD, CBLD, CBUW, and CBLW at the edge of the rolled material at this time are expressed by Expressions (5) and (6).

Furthermore, the vertical work roll vertical axis distances SBDS and SBWS at the rolled material edge can be expressed by the equations (7) and (8), and the upper and lower work roll gaps GBDS and GBWS at the rolled material edge are expressed as It can be expressed by equations (9) and (10).

The rolling system of the present embodiment grasps the camber of the rolled material before biting by using the entrance camber meter 7 and estimates the off-center amount OC of the rolled material 10 with respect to the upper and lower work rolls 1a and 1b. The cross point of the upper and lower work rolls 1a and 1b is moved by a value equal to the off-center amount OC of the rolled material 10 in a direction perpendicular to the rolling direction, and the meandering of the rolled material 10 is controlled. Further, during rolling after rolling (during passing), the meandering is controlled by moving the cross point as in the basic embodiment.

FIG. 10 shows a calculation flow performed by the arithmetic processing unit 12 at this time.

In FIG. 10, the camber of the rolled material 10 is measured by the entrance side camber meter 7, and the off-center amount OC of the rolled material 10 with respect to the upper and lower work rolls 1a, 1b.
Is calculated (step 200), and the off-center amount OC is calculated.
Is substituted into the above-described equations (1) to (4) to obtain the horizontal movement amount CSU of each work roll chock.
Calculate D, CSLD, CSUW, CSLW (step 21)
0).

At this time, in the rolling system shown in FIG. 1, the cross angles θU and θL of the upper and lower work rolls 1a and 1b are set to appropriate values to control the thickness difference distribution (crown) in the width direction. As the cross angles θU and θL in (1) to (4), values set in this crown control are input.

The horizontal movement amounts CSUD, CSLD, CSUW, CSLW of the work roll chock obtained as described above are output to the controller 11 (step 220), and the controller 11 outputs the horizontal movement amounts CSUD, CSLD, CSU.
Cross blocks 5a, 5b, 5 to obtain W, CSLW
Outputs a command to c.

The control during rolling (during passing) after biting is the same as in the basic embodiment shown in FIG.

According to the present embodiment, the occurrence and divergence of the camber of the rolled material can be suppressed more effectively without interfering with the control of the thickness of the sheet or the control of the thickness difference distribution (crown) in the width direction, and the meandering during rolling can be suppressed. , And stable operation of the rolling line and quality improvement of the rolled material can be achieved.

(Embodiment in which off-center is generated before biting of rolled material and wedge material is rolled) The present invention is applied to control when off-center is generated before biting and wedge is generated in the rolled material. FIG. 1 shows an embodiment in which the present invention is applied.
1 and FIG. This embodiment moves the cross point by the off-center amount before biting the rolled material, bites the rolled material, and rolls the wedge,
Corrections are made to the pressing positions on the driving side and the working side, thereby correcting the edges and preventing meandering.

In FIG. 11, the rolling system according to the present embodiment comprises work rolls 1a and 1b, upper and lower drive chocks 2a, 2c, similarly to the embodiment shown in FIG.
b, 2c and 2d, drive side and work side hydraulic pressure reduction devices 3a
And 3b, load meters 4a and 4b on the drive side and working side, cross blocks 5a, 5b, 5c and 5d, thickness gauge 6 and camber gauge 7 on the rolled material entry side, thickness gauge 8 and camber on the rolled material exit side. 9, controller 11, arithmetic processing unit 12
And

The positional relationship between the rolls and the rolled material when the cross angle is given to the upper and lower work rolls 1a and 1b is the same as in the basic embodiment described with reference to FIG. = −CSLD, CSUW = −CSLW, the cross point is moved only in the direction perpendicular to the rolling direction and the cross angles θU and θL are kept unchanged, and the thickness control and width direction plate are controlled. Interference with thickness difference (crown) control can be avoided. By operating the hydraulic pressure reduction devices 3a and 3b on the drive side and the work side, the vertical center distances SDS and SWS of the upper and lower roll chocks on the drive side and the work side are changed, and the upper and lower sides of the rolled material edge are changed. The distance SBDS and SBWS between the center axes of the work rolls 1a and 1b in the vertical direction can be set to a desired distance.

The relationship between the cross angles θU and θL of the upper and lower work rolls 1a and 1b and the horizontal movement amounts CSUD, CSLD, CSWW and CSLW of each work roll chock are expressed by equations (1) to (4). The work roll horizontal displacement amounts CBUD, CBLD, CBUW, and CBLW at the edge of the rolled material at this time are expressed by Expressions (5) and (6).

Further, the vertical work roll vertical axis distances SBDS and SBWS at the rolled material edge portion can be expressed by the equations (7) and (8), and the upper and lower work roll gaps GBDS and GBWS at the rolled material edge portion are expressed as It can be expressed by equations (9) and (10).

The rolling system of the present embodiment grasps the wedge and the camber of the rolled material before biting by using the thickness gauge 6 and the camber meter 7 on the input side, and the upper and lower work rolls 1a, 1
estimating the off-center amount OC of the rolled material 10 with respect to b,
The drive side and working side hydraulic pressure reduction devices 3a or 3b are adjusted so as to correct the wedge, and the cross point of the upper and lower work rolls 1a and 1b in a direction perpendicular to the rolling direction by a value equal to the off-center amount OC of the rolled material 10. Move
The generation of wedges and camber of the rolled material 10 is suppressed. Further, during rolling after rolling (during passing), the meandering is controlled by moving the cross point as in the basic embodiment.

FIG. 12 shows a calculation flow performed by the arithmetic processing unit 12 at this time.

In FIG. 12, the camber of the rolled material 10 is measured by the entrance side camber meter 7, and the off-center amount OC of the rolled material 10 with respect to the upper and lower work rolls 1a, 1b.
Is calculated (step 200), and the off-center amount OC is calculated.
Is substituted into the above-described equations (1) to (4) to obtain the horizontal movement amount CSU of each work roll chock.
Calculate D, CSLD, CSUW, CSLW (step 21)
0).

At this time, in the rolling system shown in FIG. 1, the cross angles θU and θL of the upper and lower work rolls 1a and 1b are set to appropriate values to control the thickness difference distribution (crown) in the width direction. As the cross angles θU and θL in (1) to (4), values set in this crown control are input.

The wedges (roll-in WS thickness HW and roll-in DS thickness HD) of the rolled material 10 are measured by the thickness gauge 6 on the entry side, and the drive side and the working side necessary to correct the wedges are measured. The amount of correction of the rolling position of the hydraulic rolling device 3a or 3b is calculated (Step 230).

The horizontal movement amounts CSUD, CSLD, CSUW, CSLW of the work roll chock and the correction position of the rolling position obtained as described above are output to the controller 11 (step 220). C
A command is output to the cross blocks 5a, 5b, 5c so as to obtain SUD, CSLD, CSUW, and CSLW, and the hydraulic pressure lowering device 3a or 3b is used so as to obtain the amount of correction of the rolling position.
To output the command.

The control during rolling (during passing) after biting is the same as in the basic embodiment shown in FIG.

According to the present embodiment, when the wedge material is rolled, the wedge ratio can be rolled at a constant wedge ratio or the wedge can be reduced by correcting the setting of the rolling position of the roll. Without interfering with the distribution (crown) control, the generation and divergence of the rolled material camber can be suppressed more effectively, the meandering during rolling can be prevented, the stable operation of the rolling line and the quality of the rolled material can be improved. .

(Embodiment in which the upper and lower roll chocks are moved in a horizontal direction as a pair) An embodiment in which the present invention is applied to a rolling mill in which an upper and lower work roll chock is moved in a horizontal direction as a pair will be described with reference to FIG. .

In FIG. 12, the rolling system of this embodiment is similar to the basic embodiment shown in FIG.
And 1b, upper and lower drive side and work side roll chocks 2
a, 2b, 2c and 2d, hydraulic pressure reduction devices 3a and 3b on the driving side and the working side, load cells 4a and 4 on the driving side and the working side
b, cross blocks 5a, 5b, 5c and 5d (see FIG. 1), thickness gauge 6 on the rolled material entry side (see FIG. 1), thickness gauge 8 on the rolled material exit side, and camber meter 9 (see FIG. 1) , A controller 11, and an arithmetic processing unit 12.

In this embodiment, rolling is performed while the upper and lower work rolls do not cross each other and are kept in a parallel state. In order to move the work roll chock while keeping the upper and lower work rolls in a parallel state, the horizontal movement amount of the upper and lower work roll chock is set to the same value in the same direction. (The absolute value of the movement amount of each work roll chock is CSLD = CSUD, CSLW = CSW. That is, θU =
θL) At this time, the drive side of each work roll chock is moved to the rolled material input side and the work side and the rolled material discharge side, or the drive side is moved to the rolled material discharge side and the work side is moved to the rolled material input side. That is, the horizontal movement between the drive side and the work side is reversed between the entry side and the exit side.

In this embodiment, there is no cross point between the upper and lower work rolls. However, if there is a cross point between the work roll and the center line of the rolling mill, and the rolled material is off-center immediately below the work roll, The cross point between the roll and the rolling mill center line is perpendicular to the rolling direction, and the rolled material moves in the direction in which the off-center occurs, thereby preventing meandering. In order to move the cross point between the work roll and the center line of the rolling mill to the driving side, the arithmetic processing unit 12 performs an operation so as to satisfy the relationship of CSLD = CSUD <CSLW = CSW, and the controller 11
To operate the work roll chocks. At this time, a desired initially set plate thickness is obtained by rolling on the cross point between the work roll and the center line on the entrance and exit of the rolling mill.

In the above embodiment, the role of measuring the off-center amount of the rolled material may be determined by visual judgment of the operator.

Even if the vertical center-to-center distances SDS and SSW of the upper and lower work rolls 1a and 1b are the same, the edge work roll of the rolled material 10 is affected by the off-center amount OC. Direction movement amount CBUD, CBLD, C
There is a difference between BUD and CBLW. As a result, equations (9) and (1)
0), the work roll gap GB on the drive side and the work side edge of the rolled material 10 becomes larger on the drive side than on the work side (GBWS <GBDS), and the rolled material 10 after rolling becomes a wedge material, There is a possibility that camber may occur in the material 10, but when the rolled material is off-center immediately below the roll, the horizontal and vertical distances between the axes are simultaneously controlled,
Such camber and meandering may be prevented.

[0107]

According to the present invention, the occurrence and divergence of rolled material camber can be suppressed and meandering during rolling can be prevented without interfering with thickness control or width direction thickness difference distribution (crown) control. In addition, stable operation of the rolling line and improvement of the quality of the rolled material can be achieved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a rolling system according to a basic embodiment of the present invention, (a) is a front view, and (b) is a plan view.

FIG. 2 is a side view showing a schematic configuration of a rolling system according to a basic embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a roll gap distribution when a cross point is shifted.

FIG. 4 is a flowchart showing a calculation flow of the arithmetic processing unit.

FIG. 5 is an explanatory diagram showing specifications used for calculation of the arithmetic processing unit.

FIG. 6 is a side view showing a schematic configuration of an embodiment when the present invention is applied to a reverse rolling mill.

FIG. 7 is a graph showing a camber amount for each pass during reverse rolling.

FIG. 8 is a side view showing a schematic configuration of an embodiment when the present invention is applied to a tandem rolling mill.

FIG. 9 is a plan view showing a schematic configuration of an embodiment in a case where the present invention is applied to control in a case where an off-center occurs before a rolled material bites.

FIG. 10 is a flowchart illustrating a calculation flow of an arithmetic processing unit.

FIGS. 11A and 11B are diagrams showing a schematic configuration of an embodiment in the case of rolling a wedge material in which an off center is generated before the rolled material bites, according to the present invention, wherein FIG. 11A is a front view, and FIG. FIG.

FIG. 12 is a flowchart illustrating a calculation flow of an arithmetic processing unit.

FIG. 13 is a front view showing a schematic configuration of an embodiment when the upper and lower roll chocks are operated in a horizontal direction as a pair.

FIG. 14 is a schematic diagram showing a relationship between a wedge and a camber.

[Explanation of symbols]

1a, 1b Upper and lower work rolls 2a, 2b, 2c, 2d Upper and lower drive side, work side roll chocks 3a, 3b Drive side, work side hydraulic pressure reduction device 4a, 4b Drive side, work side load meter 5a, 5b, 5c, 5d Upper and lower drive side, work side cross block 6,8 Thickness gauge on rolled material entrance / exit side 7,9 Camber gauge on rolled material entrance / exit side 10 Rolled material 11 Controller 12 Processing unit

Continued on the front page (72) Inventor Koji Sato 7-2-1, Omika-cho, Hitachi City, Ibaraki Pref. Hitachi, Ltd. Power and Electricity Development Division (72) Inventor Yukio Hirama 7-2 Omika-cho, Hitachi City, Ibaraki Prefecture No. 1 In the Power & Electric Equipment Development Division, Hitachi, Ltd.

Claims (12)

[Claims] 1. A rolling method using two or more rolling mills having a mechanism for moving upper and lower roll chocks in a horizontal direction and intersecting the upper and lower rolls. The amount of off-center relative to the center of the rolling mill is detected, and based on this amount of off-center, the cross point of the center axis of the upper and lower rolls is perpendicular to the rolling direction, and the distance between the cross point and the center of the rolled material is reduced. A rolling method, wherein the roll chock is moved in a horizontal direction so as to move. 2. A rolling method using two or more reverse rolling mills having a mechanism for moving upper and lower roll chocks in a horizontal direction and intersecting upper and lower rolls, wherein a rolled material immediately below the rolls of the rolling mill during rolling. The amount of off-center with respect to the center of the rolling mill is detected, and based on this amount of off-center, the cross point of the central axis of the upper and lower rolls is perpendicular to the rolling direction, and the distance between the cross point and the center of the rolled material becomes smaller. Rolling the chock in a horizontal direction so as to move the roll chock. 3. A rolling method using a tandem rolling mill in which at least two rolling mills having two or more stages having a mechanism for moving upper and lower roll chocks in a horizontal direction and intersecting the upper and lower rolls are provided. The off-center amount of the rolled material with respect to the center of the rolling mill immediately below the roll of at least one rolling mill is detected. Based on the off-center amount, the cross point of the center axis of the upper and lower rolls is perpendicular to the rolling direction, A rolling method wherein the roll chock is moved in a horizontal direction so as to move in a direction in which a distance between the roll chock and the center of the rolled material is reduced. 4. The rolling method according to claim 1, wherein the roll chock is moved horizontally.
A rolling method, wherein the cross angles of the upper and lower rolls with respect to a rolling mill center line perpendicular to the rolling direction are not changed. 5. A mechanism for horizontally moving upper and lower roll chocks while keeping the upper and lower rolls parallel.
In a rolling method using a rolling mill having more than one step, during rolling, the amount of off-center of the rolled material immediately below the roll of the rolling machine with respect to the center of the rolling mill is detected, and based on the amount of off-center, rolling perpendicular to the rolling direction is performed. A rolling method, wherein the roll chock is moved in a horizontal direction such that a cross point between a machine center line and a center axis of upper and lower rolls moves in a direction in which a distance between the cross point and the center of the rolled material decreases. 6. The rolling method according to any one of claims 1 to 5, wherein an off-center amount of the rolled material with respect to the center of the rolling mill is detected before the rolled material bites, and based on the off-center amount. A cross point of the center axis of the upper and lower rolls is perpendicular to the rolling direction, and the roll chock is moved in a horizontal direction such that the distance between the cross point and the center of the rolled material is reduced. . 7. A rolling system comprising two or more rolling mills having a mechanism for moving upper and lower roll chocks in a horizontal direction and intersecting upper and lower rolls, wherein during rolling, the rolled material immediately below the rolls of the rolling mill is rolled. First detecting means for detecting an off-center amount with respect to the center of the rolling mill; and, based on the off-center amount, a cross point between the center axes of the upper and lower rolls is perpendicular to the rolling direction, and a distance between the cross point and the center of the rolled material. A first computing means for controlling the horizontal movement of the roll chock so as to move the roll chock in a direction in which the rolling distance decreases. 8. A rolling system comprising two or more reverse rolling mills having a mechanism for moving upper and lower roll chocks in a horizontal direction and intersecting upper and lower rolls, wherein a rolled material immediately below the rolls of the rolling mill during rolling. Detecting means for detecting the amount of off-center with respect to the center of the rolling mill, based on the amount of off-center, the cross point of the center axis of the upper and lower rolls is perpendicular to the rolling direction, and the distance between the cross point and the center of the rolled material is A rolling system, comprising: a first calculating unit that controls the horizontal movement of the roll chock so as to move in a direction in which the distance decreases. 9. A rolling system including a tandem rolling mill in which at least two rolling mills having two or more stages having a mechanism for moving upper and lower roll chocks in a horizontal direction and intersecting upper and lower rolls are provided, First detecting means for detecting the amount of off-center of the rolled material with respect to the center of the rolling mill immediately below the roll of at least one rolling mill; and based on the amount of off-center, the cross point of the central axis of the upper and lower rolls is set in the rolling direction. A rolling system comprising: a first computing means for controlling the horizontal movement of the roll chock so as to move in a direction at a right angle so that the distance between the cross point and the center of the rolled material decreases. 10. The rolling system according to claim 7, wherein the first arithmetic means does not change the cross angles of the upper and lower rolls with respect to the center line of the rolling mill perpendicular to the rolling direction. A rolling system for controlling the movement of the roll chock in a horizontal direction. 11. A rolling system comprising two or more rolling mills having a mechanism for moving upper and lower roll chocks in a horizontal direction while keeping upper and lower rolls in parallel, First detecting means for detecting an off-center amount of the rolled material with respect to the center of the rolling mill,
Based on the off-center amount, the roll chocks so that the cross point of the center axis of the upper and lower rolls with respect to the center line of the rolling mill perpendicular to the rolling direction moves in a direction in which the distance between the cross point and the center of the rolled material becomes smaller. And a first arithmetic means for controlling the horizontal movement of the rolling system. 12. The rolling system according to claim 7, wherein an off-center amount of the rolled material with respect to the center of the rolling mill is detected before the rolled material bites.
Based on the detecting means and the off-center amount, the cross-point of the center axis of the upper and lower rolls is perpendicular to the rolling direction, and the roll chock is horizontally moved so that the distance between the cross-point and the center of the rolled material decreases. And a second calculating means for controlling movement in the direction.