JP3439299B2 - Rolling method and rolling system - Google Patents

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 and a rolling machine using a rolling machine having a mechanism in which upper and lower roll chocks are horizontally moved to cross the upper and lower rolls. The present invention relates to a rolling system equipped with.

[0002]

During rolling, it is desirable that the direction of travel of the rolled material be parallel to the rolling line, but in practice
For example, due to camber (plate bending) or the like, meandering occurs in which the traveling direction of the rolled material deviates in the lateral direction. As an effective means for preventing meandering, rolling under the condition that a rolled material is provided with a convex crown is effective. However, in recent years, there has been an increasing demand for rolled material that has a uniform thickness in both the rolling direction and the width direction by reducing the convex crown of the plate as much as possible, and meandering of the rolled material occurs cheaply, which is a major obstacle to improving yield. There is.

The cause of the meandering is various asymmetries between the working side and the driving side of the rolling mill and the rolled material, and the main ones are the difference in mill rigidity, the difference in roll opening, the difference in plate thickness on the inlet side, and the plate. There is a temperature difference and a deviation between the center of the plate and the center of the rolling mill (off center).

In Japanese Patent Publication No. 6-65404, the meandering amount 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.

Further, in Japanese Patent Laid-Open No. 6-91314,
In a thick plate reversible rolling machine that has a mechanism to move the upper and lower roll chocks horizontally and intersect the upper and lower rolls, at the time of initial setting for each pass, measure the left and right plate thickness of the rolled material and The four roll chocks are independently moved in the traveling direction of the rolled material and the cross points of the upper and lower rolls are moved to suppress the camber.

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

[0007]

The difference between the left and right mill rigidity is the difference between the working side and the driving side in the thickness of the outgoing side plate after rolling even if rolling is performed with the cross section of the incoming plate being rectangular and the off center being 0. Occurs, a difference in elongation occurs in the rolling direction of the rolled material, plate bending occurs, and the rolled material meanders. The difference between the left and right roll openings is caused by the initial setting for some reason on the working side and the driving side, and similarly to the result of the difference in mill rigidity, there is a difference in elongation in the rolling direction of the rolled material, causing plate bending and rolling material. Meanders. The difference between the left and right inlet side plate thicknesses is 0 even if the left and right mill rigidity difference is 0, and the left and right roll opening difference is 0. A difference in elongation occurs in the direction, plate bending occurs, and the rolled material meanders. The difference in plate temperature causes a difference in the deformation resistance between the working side and the driving side of the rolled material, and even if the left and right mill rigidity difference is 0 or the left and right roll opening difference is 0, the work side and the driving side are driven. A difference occurs in the rolling reduction on the side, a difference in elongation occurs in the rolling direction of the rolled material, plate bending occurs, and the rolled material meanders. Further, when the rolled material is bitten while the off-center is generated, a wedge is generated in the rolled material, plate bending occurs, and the rolled material meanders even if any other condition maintains symmetry.

FIG. 14 shows the generation of wedges, camber and meandering phenomenon during rolling. As shown in FIG.
When a rolled material having a rectangular cross section and no camber is rolled before rolling, if the rolled material approaches the working side (WS) due to the above factors, the rolled material after rolling is a sheet of WS as shown in FIG. It is thick and rolled into a curved WS shape. On the contrary, in the case of approaching to the drive side (DS), the rolled material after rolling has a large DS plate thickness as shown in FIG.

As described above, when the rolled material leans 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 occurs in the outgoing rolled material.

As a means for controlling at least one of the wedge and the camber of the rolled material during rolling, Japanese Patent Publication No. 6-65.
There is a correction of the rolling position setting as shown in Japanese Patent No. 404.
However, this correction of the rolling position control meanders of the rolled material, but it interferes with the plate thickness control and the width direction plate thickness difference distribution (crown) control, and deteriorates the quality of the rolled material after rolling.
If the control method is not appropriate, the rolled material will be WS and D just below the roll.
There are problems such as an unstable phenomenon that vibrates in S, and meandering in the direction of divergence because control is not in time, and an accident such as narrowing occurs.

On the other hand, in JP-A-6-91314,
At the time of initial setting for each pass, the left and right plate thickness of the rolled material is measured, and the four roll chocks on the top, bottom, left and right are independently moved in the traveling direction of the rolled material, and the camber is moved by moving the cross points of the upper and lower rolls. It's suppressed. But,
In this method, the cross point is moved at the initial setting of each pass, that is, before the rolled material is caught, and the thickness and off-center amount of the rolled material are measured during rolling of the rolled material (during rolling). Then, the cross points of the upper and lower rolls are fixed, and the left and right rolling position settings are 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 problems as those of the above-mentioned conventional technique (Japanese Patent Publication No. 6-65404) are caused. In Japanese Patent Laid-Open No. 7-171608, the meandering of the rolled material and the single gauge are prevented by shifting and controlling the cross angles of the upper and lower work rolls. In this method, as a result, the cross points of the upper and lower rolls move in two directions, the rolling direction and the direction perpendicular to the rolling direction. As described above, in this conventional technique, since the cross angle of the upper and lower work rolls changes and the cross point also moves in the rolling direction, it interferes with the plate thickness control and the width direction plate thickness difference distribution (crown) control, and the desired plate thickness. Can't get

An object of the present invention is to suppress the generation and divergence of camber of a rolled material, prevent the meandering during rolling, and prevent rolling without interfering with the control of the plate thickness and the control of the plate thickness difference distribution (crown) in the width direction. It is an object of the present invention to provide a rolling method and a rolling system which enable stable operation of a line and improvement of quality of rolled material.

[0013]

(1) In order to achieve the above object, the present invention provides a rolling mill of two or more stages having a mechanism in which upper and lower roll chocks are moved in the horizontal direction and upper and lower rolls are crossed. In the rolling method used, during rolling, the off-center amount of the rolled material immediately below the roll of the rolling mill with respect to the rolling mill center is detected, and based on this off-center amount, the cross points of the central axes of the upper and lower rolls are in the rolling direction. The roll chock is moved in the horizontal direction so that the distance between the cross point and the center of the rolled material becomes small at a right angle to the horizontal direction of the roll chock.
The direction of movement is to the rolling mill center line perpendicular to the rolling direction.
The cross angles of the upper and lower rolls do not change.
It shall be done .

In the present invention configured as described above, since the cross points of the upper and lower rolls move only in the direction perpendicular to the rolling direction, the plate thickness control and the width direction plate thickness difference distribution (crown) are performed.
Without interfering with the control, it is possible to suppress the generation and divergence of the camber of the rolled material and prevent the meandering during rolling. Also, the cross angle of the upper and lower rolls does not change, so the plate
Interference with thickness control and width direction plate thickness difference distribution (crown) control
It can be prevented more reliably.

(2) Further, in order to achieve the above object,
The present invention moves the upper and lower roll chocks horizontally,
In a rolling method using a two or more-stage reverse rolling machine having a mechanism for intersecting upper and lower rolls, during rolling, the off-center amount of the rolled material immediately below the rolls of the rolling mill with respect to the center of the rolling mill is detected. Based on quantity
The cross points of the central axes of the upper and lower rolls are at right angles 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 decreases , and the horizontal direction of the roll chock
The movement is to the rolling mill center line perpendicular to the rolling direction.
Make sure that the cross angles of the upper and lower rolls do not change.
Cormorant thing to be.

In the present invention having the above-described structure, the cross points of the upper and lower rolls move only in the direction perpendicular to the rolling direction. It is possible to suppress the generation and divergence of the camber of the rolled material and prevent the meandering during rolling without interfering with the control of sheet thickness difference distribution (crown). Well
Also, since the cross angle of the upper and lower rolls does not change, it is possible to control the plate thickness.
And interference with width direction thickness difference distribution (crown) control
It 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 the upper and lower roll chocks in the horizontal direction and intersecting the upper and lower rolls. In a rolling method using a tandem rolling mill, during rolling, the off-center amount of the rolled material immediately below the rolls of at least one rolling mill with respect to the rolling mill center is detected, and based on this off-center amount, The cross point of the central axis is perpendicular to the rolling direction,
The roll chock is moved in the horizontal direction so that the distance between the cross point and the center of the rolled material is reduced, and the roll chock is moved in the horizontal direction.
Is above the center line of the rolling mill perpendicular to the rolling direction.
It is assumed that the cross angles of the lower rolls do not change .

In the present invention constructed as described above, since the cross points of the upper and lower rolls move 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 the above, without interfering with the plate thickness control and the width direction plate thickness difference distribution (crown) control,
It is possible to suppress the occurrence and divergence of camber of the rolled material and prevent the meandering during rolling. Also, the black and white rolls
The thickness angle does not change, so it is possible to control the plate thickness and the plate thickness difference distribution in the width direction.
(Crown) Interference with control can be prevented more reliably.

[0019]

[0020]

(4) Further , in order to achieve the above object,
The present invention relates to a rolling method using a rolling mill of two or more stages having a mechanism for horizontally moving the upper and lower roll chocks while keeping the 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 this off-center amount, the crossing point of the rolling mill center line perpendicular to the rolling direction and the center axes of the upper and lower rolls is the cross point and the center of the rolling material. The roll chock is moved in the horizontal direction so that the distance between the roll chock and the roll chock is reduced.

In the present invention having the above-described structure, since the crossing point between the rolling mill center line and the central axes of the upper and lower rolls moves only in the direction perpendicular to the rolling direction, the upper and lower rolls are kept parallel to each other. When using a rolling mill with two or more moving stages, the generation and divergence of camber of the rolled material is suppressed without interfering with the strip thickness control and the width direction strip thickness difference distribution (crown) control, and meandering during rolling. Can be prevented.

(5) In the above (1) to (4) , preferably, before the rolled material bites, the off-center amount of the rolled material with respect to the center of the rolling mill is detected, and based on this off-center amount, vertical The roll chock is horizontally moved so that the cross point of the central 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.

As a result, the movement of the cross point is controlled even before the rolled material is caught, so that the rolled material can be more effectively prevented from interfering with the strip thickness control and the width direction strip thickness difference distribution (crown) control. Generation and divergence of camber can be suppressed, and meandering during rolling can be prevented.

(6) Further , 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 rolling mills having a mechanism for intersecting upper and lower rolls, a first detecting means for detecting an off-center amount of a rolled material with respect to the rolling mill center immediately below the rolling rolls during rolling. Based on this off-center amount, the roll chock is moved horizontally so that the cross points of the central axes of the upper and lower rolls are perpendicular to the rolling direction and the distance between the cross point and the center of the rolled material decreases. and a first calculating means for controlling, before
Note The first calculation means is a rolling mill center lath which is perpendicular to the rolling direction.
The cross angle of the upper and lower rolls with respect to the in
The roll chock is controlled to move in the horizontal direction so that it does not exist.

(7) Further, 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 stages of reverse rolling mills having a mechanism for crossing upper and lower rolls, a first detecting means for detecting 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 during rolling. Based on this off-center amount, the cross points of the central axes of the upper and lower rolls are 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. A first calculation means for controlling movement , wherein the first calculation means is a rolling mill section perpendicular to the rolling direction.
The cross angle of the upper and lower rolls with respect to the
Move the roll chock horizontally so that it does not change.
Dynamic control . (8) Further , in order to achieve the above object, the present invention is a tandem rolling machine in which at least two rolling mills of two or more stages having a mechanism for moving the upper and lower roll chocks in the horizontal direction and intersecting the upper and lower rolls are arranged. In a rolling system including a rolling mill, during rolling, first detecting means for detecting an off-center amount of a rolled material immediately below the rolls of at least one rolling mill with respect to the rolling mill center, and up / down movement based on this off-center amount A cross point of the central axis of the roll is perpendicular to the rolling direction, and a first arithmetic means for horizontally moving and controlling the roll chock so as to move in a direction in which the distance between the cross point and the center of the rolled material decreases . The first performance
The calculation means should be connected to the rolling mill center line perpendicular to the rolling direction.
Do not change the cross angles of the upper and lower rolls.
The roll chock is controlled to move in the horizontal direction .

(10) In the above (7) to (9), preferably, the first calculation means has a cross angle of the upper and lower rolls with respect to a rolling mill center line perpendicular to the rolling direction,
The roll chock is horizontally moved and controlled so as not to change.

(9) Further , in order to achieve the above object,
The present invention relates to a rolling system including two or more rolling mills having a mechanism for horizontally moving upper and lower roll chocks while keeping upper and lower rolls in parallel with each other. First detection means for detecting the off-center amount of the material with respect to the rolling mill center, and based on this off-center amount, the cross point of the center axes of the upper and lower rolls with respect to the rolling mill center line perpendicular to the rolling direction is A first calculation means is provided for controlling the horizontal movement of the roll chock so that the roll chock moves in a direction in which the distance from the center of the rolled material decreases.

(10) In the above (6) to (9) , preferably, before the rolled material is caught, a second detecting means for detecting the off-center amount of the rolled material with respect to the center of the rolling mill, and the off-center. Secondly, based on the amount, the cross points of the central axes of the upper and lower rolls are perpendicular to the rolling direction, and the roll chock is horizontally moved and controlled so as to move in a direction in which the distance between the cross points and the center of the rolled material decreases. A calculation means is further provided.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings.

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

In FIG. 1 and FIG. 2, the rolling system according to the present embodiment comprises upper and lower work rolls 1a and 1b located 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, hydraulic pressure reducing devices 3a and 3b on the driving side and working side for setting the vertical positions of these roll chocks, and a load side 4a on the driving side and working side for measuring the rolling load of the rolling mill. And 4b and cross blocks 5a, 5b, 5c for setting the horizontal position of the roll chock.
And 5d, a plate thickness gauge 6 located on the rolled material entrance side, a plate thickness gauge 8 and a camber gauge 9 located on the rolled material exit side, hydraulic pressure reduction devices 3a and 3b, and cross blocks 5a, 5b, 5c.
And the controller 11 which issues a command to 5d and the load cell 4a
And 4b, the plate thickness gauges 6 and 8, and the camber gauge 9 are arithmetically processed to send a command value to the controller 11.

In the rolling system shown in FIG. 1, the cross blocks 5a, 5b, 5c and 5d can be horizontally moved to give an angle to the upper and lower work rolls 1a and 1b.

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

In FIG. 3, the work roll chock 2
Horizontal movement amount CSUD, CSL of a, 2b, 2c and 2d
If D, CSUW, and CSLW are all equal, the upper and lower cross angles θ
U and θL are also equal, and the upper and lower work rolls 1a, 1 are located at the center L / 2 of the distance L between the roll chocks on the driving side and the working side.
b intersects.

Here, if a difference is produced in the moving amounts CSUD and CSLD of the upper and lower roll chocks on the driving side and between the moving amounts CSUW and CSLW of the upper and lower roll chock on the working side, the work rolls 1a and 1b are produced. Differences can be generated in the cross angles θU and θL. Further, the moving amounts CSUD and CSUW of the upper roll chock on the driving side and the working side, or the moving amounts CSLD and CS of the lower roll chock on the driving side and the working side.
If there is a difference in LW, the upper and lower work rolls 1a, 1b
The cross point of the roll side from the position of the center L / 2 of the distance L between the roll chocks on the driving side and the working side to the desired side on the rolled material entry side, the outgoing side (rolling direction), the driving side, 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 plate thickness control and the width direction plate 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. It is necessary to prevent it (.theta.U =-. Theta.L), and for this purpose, the upper and lower roll chock movement amounts may be controlled with the relationship of CSUD = -CSLD, CSUW = -CSLW. ("-" In the formula means that the moving directions are opposite.) In addition, by operating the hydraulic pressure reduction devices 3a and 3b on the driving side and the working side, the upper and lower roll chocks on the driving side and the working side are operated. By changing the vertical center distances SDS and SWS, the vertical center distances SBDS and SBWS of the work rolls 1a and 1b above and below the rolled material edge portion are changed.
Can be set to a desired distance.

The upper and lower work rolls 1a and 1b shown in FIG.
Of the cross angles θU, θL of each of the work roll chocks and the horizontal movement amounts CSUD, CSLD, CSUW, CSLW of each work roll chock are given by equation (1).
To (4). In addition, the work roll horizontal deviations CBUD, CBLD, CBUW, CB at the edge of the rolled material at that time
LW can be expressed by equations (5) and (6).

[0039]

[Equation 1]

Here, L is the distance between the roll chocks on the driving side and the working side, B is the width of the rolled material, 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 roll chocks on the driving side and the working side). Center L of distance L
The amount of deviation with respect to the position (/ 2 position).

Further, the vertical work roll vertical axis center distances SBDS, 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, GBWS at the rolled material edge portion are It can be expressed by equations (9) and (10).

[0042]

[Equation 2]

Here, SDS and SWS are the actual values of the axial center distances of the upper and lower roll chocks on the driving side and the working side in the vertical direction, and normally, SDS = SWS = SBDS = SBWS. DR is the average diameter of the upper and lower work rolls.

In the rolling system of this embodiment, the wedge and the camber after rolling are measured by using the exit side plate thickness gauge 8 and the camber gauge 9, and the off-center amount OC of the rolled material 10 between the upper and lower work rolls 1a and 1b is measured. Estimate and move the cross points 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 to suppress the occurrence of camber and wedge of the rolled material 10 It controls the meandering of.

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

In FIG. 4, from the thickness gauge 8 on the outlet side to the outlet W
Measure the S plate thickness hW and the output side DS plate thickness hD, and measure the input side plate thickness 6
Or, obtain the entrance-side average plate thickness hO from the plate thickness setting of the previous pass,
From the constant volume condition, the strip width invariant is determined to obtain the incoming side rolled material length lO, and using the formula (11), the outgoing side rolled material length lW,
The outgoing DS rolled material length ID is calculated.

Next, the rolling reduction difference Δr between WS and DS is calculated using equation (12). This reduction ratio difference Δr or the outgoing side WS rolled material length lW, the outgoing side DS rolled material length ID and the strip width B
If the camber of the rolled material on the outgoing side is assumed to be a circular arc by using, 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-side camber meter 9 by using the 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 exit side camber meter 9, and OS is the rolled material edge immediately below the exit side camber meter. The distance from the center of the rolling mill.

Off-center amount OC determined in this way
By substituting equations (1) to (4) into the horizontal movement amount 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 width direction plate thickness difference distribution (crown). The cross angles θU and θL from (1) to (4) are input with the values set by this crown control.

Next, the output side WS plate thickness hW and the output side DS plate thickness hD
Determining a correction amount of the reduction position of the drive side and work side from (stearyl
-Up 130).

The horizontal movement amounts CSUD, CSLD, CSUW, CSLW of the work roll chock and the correction amounts of the rolling positions on the driving side and the working side, which are obtained as described above, are output to the controller 11 (step 140).

The controller 11 obtains the horizontal movement amounts CSUD, CSLD, CSUW, CSLW calculated by the arithmetic processing unit 12 and the cross block 5a, 5b, 5c and 5d so that the correction amounts of the driving side and the working side can be obtained. And outputs commands to the hydraulic pressure reduction devices 3a and 3b.

In the present embodiment configured as described above, the work side and drive side roll chocks 2a, 2b, 2c and 2d of the upper and lower work rolls 1a and 1b are independently driven horizontally to perform rolling. However, the width direction plate thickness difference distribution (crown) control can be performed. Also,
In order to suppress meandering due to off-center of the rolled material, the cross points of the upper and lower work rolls are 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 chock is performed so that the cross angles of the upper and lower work rolls do not change with respect to the rolling mill center line that is perpendicular to the rolling direction. Therefore, it becomes possible to carry out rolling that suppresses the divergence of meandering of the rolled material, and it is possible to further reduce disturbance to the plate thickness control and the crown control.

If the rolled material is a wedge material on the delivery side of the rolling mill, the wedge can be made smaller by correcting the setting of the rolling position of the roll. That is, it is possible to control the meandering by moving the cross points and control the wedges by modifying the reduction setting, and share the functions of controlling the camber and the wedges. Can greatly reduce the product quality.

(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.

In FIG. 6, the rolling system according to the present embodiment has upper and lower work rolls 1a and 1b positioned above and below the rolled material 10 for rolling, and these upper and lower work rolls 1a.
And upper and lower reinforcing rolls 13a and 13b for supporting 1 and 1b. Further, as in the above-described basic embodiment, the positions of the upper and lower work rolls 1a and 1b are fixed by the upper and lower drive side and work side roll chocks 2a, 2b, 2c and 2d (see FIG. 1), and the vertical direction of these roll chocks is fixed. Is located on the drive side and the working side.
(See FIG. 1), the horizontal position of the roll chock is set to the cross blocks 5a, 5b, 5c and 5d.
(See FIG. 1). The positions of the upper and lower reinforcing rolls 13a and 13b are fixed by roll chockes (not shown) on the upper and lower driving sides and the working side.

Further, the rolling system of this embodiment is similar to the basic embodiment in that the strip thickness gauge 6 on the rolled material entry side, the strip thickness gauge 8 and the camber gauge 9 on the rolled material exit side, the controller 11, and the arithmetic processing unit. 12 is provided, and a camber meter 7 is also provided on the rolled material entrance 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 a cross angle is given to the upper and lower work rolls 1a and 1b is the same as that in the basic embodiment described with reference to FIG. = -CSLD, CSUW = -CSLW If the control is performed with the relationship, the cross point is moved only in the direction perpendicular to the rolling direction and the cross angles θU and θL are not changed, and the plate thickness control and the width direction plate are performed. It is possible to avoid interference with the thickness difference distribution (crown) control. Further, by operating the hydraulic pressure reduction devices 3a and 3b on the drive side and the working side, the vertical center distance between the upper and lower roll chocks on the driving side and the working side of the upper and lower reinforcing rolls 13a and 13b can be set to a desired distance. Set and work the work rolls 1a, 1
The vertical axis distances SBDS and SBWS of b can be set to desired distances.

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 work roll chocks is expressed by equations (1) to (4). The work roll horizontal shift amounts CBUD, CBLD, CBUW, and CBLW at the edge of the rolled material at this time are expressed by equations (5) and (6).

Further, for the vertical work roll vertical axis center distances SBDS and SBWS of the rolled material edge portion, the correction numbers in consideration of the gap between the work roll and the reinforcing roll should be added to the equations (7) and (8). The upper and lower work roll gaps GBDS and GBWS at the edge portion of the rolled material can be expressed by adding the correction numbers to the equations (9) and (10).

In the rolling system of this embodiment, the wedge and the camber after rolling are measured by using the entrance side plate thickness gauge 6 and the camber meter 7 or the exit side plate gauge 8 and the camber gauge 9 according to the pass direction, and the upper and lower workpieces are measured. The off-center amount OC of the rolled material 10 between the rolls 1a and 1b is estimated, and the cross points of the upper and lower work rolls 1a and 1b are moved by a value equal to the off-center amount OC of the rolled material 10 in the direction perpendicular to the rolling direction. It suppresses the generation of camber and wedge of the rolled material 10 and controls 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. Further, FIG. 6 shows the upper and lower work rolls 1a, 1
The cross angle is given to b, and the case where the rolled material 10 after one-pass rolling is rolled by changing the traveling direction is shown.

FIG. 7 shows the amount of camber in each pass in comparison with the conventional method in which the rolling position is corrected. In both the conventional method and the present invention, almost no camber is generated in the 1st and 2nd passes, but in the conventional method, camber is generated in the 3rd and 4th passes and almost diverged in the 5th 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 the rolling position correction 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 when reaching the downstream path.

According to the present embodiment, in the rolling system having the reverse rolling mill, the generation and divergence of the camber of the rolled material can be suppressed without interfering with the plate thickness control and the width direction plate thickness difference distribution (crown) control. Prevents meandering during rolling,
It enables stable operation of rolling line and improvement of quality of rolled material.

In this embodiment, even if a winding device is provided on the inlet / outlet side of the rolling mill, the essence does not differ.

(Example of Tandem Rolling Mill) An example of applying the present invention 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 on which upper and lower work rolls 1a and 1b which are located above and below the rolled material 10 and which roll, and upper and lower work rolls 1a and 1b which support these work rolls 1a and 1b, respectively. Reinforcing roll 1
3a and 13b. Further, as in the above-described basic embodiment, the positions of the upper and lower work rolls 1a and 1b are set to the upper and lower drive side and work side roll chocks 2a, 2b, 2c.
And 2d (see FIG. 1), the vertical position of these roll chock is set by the hydraulic pressure reducing devices 3a and 3b (see FIG. 1) on the driving side and the working side, and the horizontal position of the roll chock is 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 roll chockes (not shown) on the upper and lower driving sides and the working side.

Further, the rolling system of the present embodiment is similar to the basic embodiment in that the strip thickness gauge 6 on the rolled material entry side, the strip thickness gauge 8 and the camber gauge 9 on the rolled material exit side, the controller 11, and the arithmetic processing unit. It has twelve. However, the role of the wedge measurement of the plate thickness gauge 6 located on the entry side may be detected by the load difference between the driving side and the working side of the F2 stand. Further, the role of the wedge gauge of the plate thickness gauge 9 located on the exit side may be detected by the load difference between the driving side and the working side of the F4 stand.

The positional relationship between the rolls and the rolled material when a 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 If the control is performed with the relationship, the cross point is moved only in the direction perpendicular to the rolling direction and the cross angles θU and θL are not changed, and the plate thickness control and the width direction plate are performed. It is possible to avoid interference with the thickness difference distribution (crown) control. Further, by operating the hydraulic pressure reduction devices 3a and 3b on the drive side and the working side, the vertical center distance between the upper and lower roll chocks on the driving side and the working side of the upper and lower reinforcing rolls 13a and 13b can be set to a desired distance. Set and work the work rolls 1a, 1
The vertical axis distances SBDS and SBWS of b can be set to desired distances.

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 work roll chocks is expressed by the equations (1) to (4), and The work roll horizontal shift amounts CBUD, CBLD, CBUW, and CBLW at the edge of the rolled material at this time are expressed by equations (5) and (6).

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

In the rolling system of this embodiment, the wedge and the camber after rolling are measured by using the exit side plate thickness gauge 8 and the camber gauge 9, and the off-center amount OC of the rolled material 10 between the upper and lower work rolls 1a and 1b is measured. Estimate and move the cross points 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 to suppress the occurrence of camber and wedge of the rolled material 10 It controls the meandering of. 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 the rolling system having the tandem rolling mill, the generation and divergence of the camber of the rolled material can be suppressed without interfering with the plate thickness control and the width direction plate thickness difference distribution (crown) control. Prevents meandering during rolling,
It enables stable operation of rolling line and improvement of quality of rolled material.

(Example when off-center occurs before biting of rolled material) Example when the present invention is applied to control when off-center occurs before biting of rolled material 9 and FIG. In this embodiment, if the off-center occurs before the rolling material is bitten, the rolling point is bitten by moving the cross point by the amount of the off-center.

In FIG. 9, the rolling system of the present embodiment is similar to the basic embodiment in that the work rolls 1a and 1b, the upper and lower drive side and work side roll chocks 2a, 2b, 2c.
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 driving side and the working side
(See FIG. 1), cross blocks 5a, 5b, 5c and 5
d, rolled material entry side thickness gauge 6, rolled material exit side thickness gauge 8 and camber gauge 9, controller 11, arithmetic processing unit 12
It has and.

The rolling system of this embodiment is also provided with a camber meter 7 on the rolled material entrance 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 a cross angle is given to the upper and lower work rolls 1a and 1b is the same as that in the basic embodiment described with reference to FIG. = -CSLD, CSUW = -CSLW If the control is performed with the relationship, the cross point is moved only in the direction perpendicular to the rolling direction and the cross angles θU and θL are not changed, and the plate thickness control and the width direction plate are performed. It is possible to avoid interference with the thickness difference distribution (crown) control. Further, by operating the hydraulic pressure reduction devices 3a and 3b on the driving side and the working side, the vertical center distances SDS and SWS of the upper and lower roll chock on the driving side and the working side are changed, and The vertical center distances SBDS and SBWS of the work rolls 1a and 1b can be set to desired distances.

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 work roll chocks is expressed by the equations (1) to (4), The work roll horizontal shift amounts CBUD, CBLD, CBUW, and CBLW at the edge of the rolled material at this time are expressed by equations (5) and (6).

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

In the rolling system of the present embodiment, the camber of the rolled material before biting is grasped using the entry 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 estimated, The meandering of the rolled material 10 is controlled by moving the cross points 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 the direction perpendicular to the rolling direction. Further, during rolling after rolling (during rolling), the cross point is moved to control the meandering 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 and 1b is measured.
Is calculated (step 200), and this off-center amount OC
By substituting equations (1) to (4) described above into 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 perform the width direction plate thickness difference distribution (crown) control. The cross angles θU and θL from (1) to (4) are input with the values set by this crown control.

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

The control during rolling (in 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 plate thickness control and the width direction plate thickness difference distribution (crown) control, and the meandering during rolling can be achieved. This enables stable operation of the rolling line and improvement of the quality of rolled material.

(Example in which off-center occurs before biting of rolled material and wedge material is rolled) The present invention is applied to control when off-center occurs before biting and wedge occurs in rolled material. FIG. 1 shows an embodiment when applied.
1 and FIG. In this embodiment, before biting the rolled material, the cross point is moved by the amount of the off-center, the rolled material is bited, and the wedge is rolled.
Corrections are made to the rolling positions on the driving side and the working side to correct edges and prevent meandering.

In FIG. 11, the rolling system of the present embodiment is similar to the embodiment shown in FIG. 9 with work rolls 1a and 1b, upper and lower drive side and work side roll chocks 2a and 2b.
b, 2c and 2d, hydraulic pressure reducing device 3a on the driving side and the working side
And 3b, load meters 4a and 4b on the driving side and working side, cross blocks 5a, 5b, 5c and 5d, strip thickness gauge 6 and camber gauge 7 on the rolled material entry side, strip thickness gauge 8 and camber on the rolled material exit side. Total 9, controller 11, arithmetic processing unit 12
It has and.

The positional relationship between the rolls and the rolled material when a 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 If the control is performed with the relationship, the cross point is moved only in the direction perpendicular to the rolling direction and the cross angles θU and θL are not changed, and the plate thickness control and the width direction plate are performed. It is possible to avoid interference with the thickness difference distribution (crown) control. Further, by operating the hydraulic pressure reduction devices 3a and 3b on the driving side and the working side, the vertical center distances SDS and SWS of the upper and lower roll chock on the driving side and the working side are changed, and The vertical center distances SBDS and SBWS of the work rolls 1a and 1b can be set to desired distances.

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 work roll chocks is expressed by equations (1) to (4). The work roll horizontal shift amounts CBUD, CBLD, CBUW, and CBLW at the edge of the rolled material at this time are expressed by equations (5) and (6).

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

In the rolling system of this embodiment, the wedge and camber of the rolled material before biting is grasped by using the entrance side plate thickness gauge 6 and the camber gauge 7, and the upper and lower work rolls 1a, 1
Estimate the off-center amount OC of the rolled material 10 with respect to b,
The hydraulic pressure reduction devices 3a or 3b on the drive side and the working side are adjusted so as to correct the wedge, and the cross points of the upper and lower work rolls 1a, 1b are equal to the off-center amount OC of the rolled material 10 in the direction perpendicular to the rolling direction. Move
The generation of wedges and camber of the rolled material 10 is suppressed. Further, during rolling after rolling (during rolling), the cross point is moved to control the meandering 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 entry-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 and 1b is measured.
Is calculated (step 200), and this off-center amount OC
By substituting equations (1) to (4) described above into the horizontal movement amount CSU of each work roll chock.
Calculate D, CSLD, CSUW, CSLW (step 21)
0).

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 width direction plate thickness difference distribution (crown). The cross angles θU and θL from (1) to (4) are input with the values set by this crown control.

In addition, the wedges of the rolled material 10 (the entrance WS plate thickness HW and the entrance DS plate thickness HD) are measured by the entrance side plate thickness gauge 6, and the driving side and the working side necessary for correcting the wedges are measured. A correction position correction amount of the hydraulic pressure reduction device 3a or 3b is calculated (step 230).

The work roll chock horizontal movement amounts CSUD, CSLD, CSUW, CSLW and the reduction position correction amounts thus obtained are output to the controller 11 (step 220), and the controller 11 outputs the horizontal movement amount. C
A command is output to the cross blocks 5a, 5b, 5c so as to obtain SUD, CSLD, CSUW, CSLW, and a hydraulic pressure reduction device 3a or 3b is provided so as to obtain the reduction position correction amount.
Command is output to.

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

According to the present embodiment, when the wedge material is rolled, by adjusting the rolling position setting of the roll, it is possible to reduce the constant wedge ratio rolling and the wedge, thereby controlling the plate thickness and the plate thickness difference in the width direction. Without interfering with distribution (crown) control, it is possible to more effectively suppress the generation and divergence of camber of rolled material, prevent meandering during rolling, and enable stable operation of the rolling line and improved quality of rolled material. .

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

In FIG . 13 , 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 chock 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), a strip thickness gauge 6 on the rolled material entry side (see FIG. 1), a strip thickness gauge 8 on the rolled material exit side and a camber gauge 9 (see FIG. 1). , A controller 11 and an arithmetic processing unit 12.

In this embodiment, the upper and lower work rolls do not intersect with each other and are rolled in parallel. In order to move the work roll chocks while keeping the upper and lower work rolls in parallel, the horizontal movement amounts of the upper and lower work roll chocks are set to the same direction and the same amount. (The absolute value of the movement amount of each work roll chock is CSLD = CSUD, CSLW = CSUW. That is, θU =
θL) At this time, the drive side of each work roll chock is moved to the rolled material inlet side and the working side and the rolled material outlet side, or the drive side is moved to the rolled material outlet side and the working side to the rolled material inlet side. That is, the horizontal movements of the driving side and the working side are opposite to each other on the entrance side and the exit side.

In this embodiment, there is no cross point between the upper and lower work rolls, but there is a cross point between the work roll and the center line of the rolling mill, and when the rolled material is off center just 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 is moved in the direction in which the off-center is generated to prevent meandering. In order to move the cross point between the work roll and the rolling mill center line to the driving side, the arithmetic processing unit 12 performs arithmetic so as to satisfy the relationship of CSLD = CSUD <CSLW = CSUW, and the controller 11
To work the work roll chock. At this time, at the cross point between the work roll and the rolling mill entrance / exit center line, the initially set desired plate thickness is obtained by rolling.

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

Even if the vertical center-to-axis distances SDS, SSW of the upper and lower work rolls 1a, 1b are the same, the edge work roll horizontal of the rolled material 10 is affected by the off-center amount OC. Directional movement amount CBUD, CBLD, C
A difference occurs between BUD and CBLW, and as a result, equation (9) and equation (1
The work roll gap GB between the driving side and the working side edge portion of the rolled material 10 represented by 0) becomes larger on the driving side than on the working side (GBWS <GBDS), and the rolled material 10 becomes a wedge material after rolling. Although camber may occur on the material 10, when the rolled material is off-centered directly under the roll, the horizontal and vertical axial distances are simultaneously controlled,
The occurrence of such camber and meandering may be prevented.

[0107]

According to the present invention, the occurrence and divergence of camber of rolled material can be suppressed and the meandering during rolling can be prevented without interfering with the control of the plate thickness and the control of the plate thickness difference distribution (crown) in the width direction. It is possible to operate the rolling line stably and improve the quality of rolled material.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a rolling system according to a basic embodiment of the present invention, in which (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 the amount of camber in each pass during reverse rolling.

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

FIG. 9 is a plan view showing a schematic configuration of an embodiment when the present invention is applied to control when an off center occurs before biting of a rolled material.

FIG. 10 is a flowchart showing a calculation flow of the arithmetic processing unit.

FIG. 11 is a diagram showing a schematic configuration of an embodiment of the present invention in the case of rolling a wedge material in which an off center is generated before biting of the rolled material, (a) is a front view, and (b) is a plan view. It is a figure.

FIG. 12 is a flowchart showing a calculation flow of the arithmetic processing unit.

FIG. 13 is a front view showing a schematic configuration of an embodiment in which the upper and lower roll chocks are paired to operate in the horizontal direction.

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

[Explanation of symbols]

1a, 1b Upper and lower work rolls 2a, 2b, 2c, 2d Upper and lower drive sides, work side roll chocks 3a, 3b Drive side, work side hydraulic pressure reducing devices 4a, 4b Drive side, work side load gauges 5a, 5b, 5c, 5d Upper and lower drive side, work side cross block 6,8 Rolled material entry / exit plate thickness gauge 7,9 Rolled material entry / exit camber gauge 10 Rolled material 11 Controller 12 Arithmetic processing unit

Front Page Continuation (72) Kenjiro Narita 7-2-1, Omika-cho, Hitachi City, Hitachi, Ibaraki Hitachi, Ltd. Power & Electric Power Development Division (72) Koji Sato 7-2, Omika-cho, Hitachi City, Ibaraki Prefecture No. 1 Hitachi, Ltd., Electric Power & Electrical Development Headquarters (72) Inventor Yukio Hirama 7-2-1, Omika-cho, Hitachi-shi, Ibaraki Hitachi, Ltd. Electric Power & Electrical Development Headquarters (56) Reference: JP-A-6 -23409 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B21B 1/00-1/46 B21B 13/14 B21B 37/00-37/78

Claims (10)

(57) [Claims] 1. A rolling method using a rolling mill of two or more stages having a mechanism in which upper and lower roll chocks are moved in a horizontal direction and upper and lower rolls are intersected with each other. The off-center amount with respect to the center of the rolling mill is detected, and based on this off-center amount, the cross points of the central axes of the upper and lower rolls are perpendicular to the rolling direction, and the distance between the cross point and the center of the rolled material is reduced. Moving the roll chock horizontally to move , the roll chock
The horizontal movement of the
The cross angle of the upper and lower rolls changes with respect to the line
A rolling method characterized by being carried out so as not to . 2. A rolling method using a two or more-stage reverse rolling machine having a mechanism in which upper and lower roll chocks are horizontally moved to cross the upper and lower rolls, and 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 points of the center axes of the upper and lower rolls are perpendicular to the rolling direction, and the distance between the cross point and the center of the rolled material becomes smaller. Moving the roll chock horizontally to move the roll chock
The horizontal movement of the
The cross angle of the upper and lower rolls changes with respect to the line
A rolling method characterized by being carried out so as not to . 3. A rolling method using a tandem rolling mill in which at least two rolling mills with two or more stages having a mechanism for moving the upper and lower roll chocks in the horizontal direction and intersecting the upper and lower rolls are arranged. The off-center amount of the rolled material under the rolls of at least one rolling mill with respect to the center of the rolling mill is detected, and based on this off-center amount, the cross points of the central axes of the upper and lower rolls are perpendicular to the rolling direction, and the cross point And moving the roll chock horizontally so that the distance between the center of the rolled material and the rolling material becomes smaller ,
The horizontal movement of the roll chock is direct in the rolling direction.
The upper and lower rolls cross the square mill center line.
A rolling method characterized in that the rolling angle is not changed . 4. A mechanism having a mechanism for moving the upper and lower roll chocks horizontally while keeping the upper and lower rolls in a parallel state.
In a rolling method using a rolling mill with more than one step, during rolling, the off-center amount of the rolled material immediately below the rolls of the rolling mill with respect to the center of the rolling mill is detected, and based on this off-center amount, rolling perpendicular to the rolling direction is performed. A rolling method, wherein the roll chock is moved horizontally so that a cross point between the machine center line and the center axes of the upper and lower rolls moves in a direction in which the distance between the cross point and the center of the rolled material decreases. 5. The rolling method according to claim 1 , wherein the amount of off-center of the rolled material with respect to the center of the rolling mill is detected before the rolled material is bitten, and based on this off-center amount. , A rolling method characterized in that the cross points of the central axes of the upper and lower rolls are perpendicular to the rolling direction, and the roll chock is moved horizontally so that the distance between the cross points and the center of the rolled material becomes smaller. . 6. A rolling system comprising two or more rolling mills having a mechanism in which upper and lower roll chocks are moved in the horizontal direction and the upper and lower rolls cross each other. First detection means for detecting the amount of off-center with respect to the center of the rolling mill, and based on this amount of off-center, the cross points of the central axes of the upper and lower rolls are perpendicular to the rolling direction, and the distance between the cross point and the center of the rolled material. And a first calculation means for controlling the movement of the roll chock in the horizontal direction so that the roll chock moves in the direction in which
The upper and lower rolls are clamped to the center line of the rolling mill at a right angle.
Use the roll chock so that the loss angle does not change.
A rolling system characterized by horizontal movement control . 7. A rolling system provided with two or more stages of reverse rolling mills having a mechanism for horizontally moving upper and lower roll chocks and intersecting the upper and lower rolls, and during rolling, a rolled material immediately below the rolls of the rolling mill. The first detecting means for detecting the off-center amount with respect to the center of the rolling mill, and based on this off-center amount, the cross points of the central axes of the upper and lower rolls are perpendicular to the rolling direction, and the cross point and the center of the rolled material are distance and a first calculating means for movement control said roll chocks in a horizontal direction so as to move in a direction decreases, the first computing means, the rolling direction
The upper and lower rolls are clamped to the center line of the rolling mill at a right angle.
Use the roll chock so that the loss angle does not change.
A rolling system characterized by horizontal movement control . 8. A rolling system provided with a tandem rolling mill in which at least two rolling mills having two or more stages having a mechanism for moving the upper and lower roll chocks in a horizontal direction and intersecting the upper and lower rolls are arranged, during rolling, First detecting means for detecting the off-center amount of the rolled material with respect to the center of the rolling mill immediately below the rolls of at least one rolling mill, and the cross point of the center axes of the upper and lower rolls is set in the rolling direction based on this off-center amount. perpendicular, and a first calculating means for movement control said roll chocks in a horizontal direction so as to move in the direction in which the distance between the center of the cross point and the rolling material becomes small, the first computing means
Is above the center line of the rolling mill perpendicular to the rolling direction.
The cross angle of the lower roll does not change.
A rolling system that controls the movement of the luchock in the horizontal direction . 9. A mechanism having a mechanism for moving the upper and lower roll chocks horizontally while keeping the upper and lower rolls in a parallel state.
In a rolling system including rolling mills with more than one stage, during rolling, first detection means for detecting an off-center amount of a rolled material immediately below the rolls of the rolling mill with respect to the center of the rolling mill,
Based on this off-center amount, the roll chock so that the cross points of the center axes of the upper and lower rolls with respect to the rolling mill center line perpendicular to the rolling direction move in a direction in which the distance between this cross point and the center of the rolled material decreases. And a first arithmetic means for controlling the horizontal movement of the rolling mill. 10. The rolling system according to claim 6 , further comprising second detecting means for detecting an off-center amount of the rolled material with respect to the center of the rolling mill before the rolled material is caught. Based on the off-center amount, the cross points of the center axes of the upper and lower rolls are perpendicular to the rolling direction, and the roll chock is horizontally moved and controlled so that the distance between the cross point and the center of the rolled material decreases. A rolling system further comprising a second calculation means.