JP5929550B2 - Metal plate rolling apparatus and rolling method - Google Patents

Description

  The present invention relates to a rolling apparatus provided with a strain measuring means for measuring elastic strain in a rolling direction generated in a roll chock in rolling a metal sheet, and a rolling method for measuring the elastic strain in the rolling direction. In particular, the present invention relates to a rolling apparatus and a rolling method for a metal plate material that can stably produce a metal plate material having no camber and warpage or having a very small camber and warpage.

In the rolling process for metal sheets, rolling the rolled sheet without cambers, that is, without bending left and right, not only avoids poor planar shape and poor dimensional accuracy of the rolled material, but also avoids troubles such as meandering and squeezing. It is also important to do. Further, the warpage generated during the rolling of the plate material greatly affects the productivity of the product, such as a reduction in rolling efficiency and an increase in the finishing process. For example, regarding the refining process, it is necessary to correct the camber and warpage by a leveler, a press or the like, and in extreme cases, it may be necessary to cut a defective portion. Further, when a larger camber or warp occurs, the rolling equipment may be damaged due to the collision of the plates. In this case, the plate itself not only loses its product value, but also causes great damage such as production stoppage and repair of rolling equipment.
In the present invention, in order to simplify the notation, the working side and the driving side of the rolling apparatus, which are the left and right when the rolling direction is the front, may be referred to as left and right.

  With respect to the problem of camber, in Patent Document 1, the load for measuring the force in the rolling direction acting on the work roll chock on both the work side and the drive side roll chock of the work roll on the entry side and the exit side of the roll chock. Measure the rolling direction force acting on the work side and drive side roll chock of the work roll, and detect the difference between the rolling direction force on the work side and the rolling direction force on the drive side, that is, the difference in the rolling direction force left and right. It is proposed to prevent the occurrence of camber by calculating and manipulating the left-right asymmetric component of the roll opening degree of the rolling device, that is, the reduction leveling, in the direction of reducing the difference between the rolling direction force left and right.

  With respect to the problem of warpage, Patent Document 2 discloses load detection for measuring the force in the rolling direction acting on both the upper and lower work roll chocks on both the entry side and the exit side of the roll chocks of both upper and lower work rolls. Provided with the apparatus, measuring the force in the rolling direction acting on the roll chock of both the upper and lower work rolls, calculating the difference between the upper rolling direction force and the lower rolling direction force, that is, the upper and lower difference in the rolling direction force, It is proposed to stably manufacture a metal plate material with no warpage or a very slight warpage by manipulating the rolling device up / down asymmetric component in the direction of reducing the vertical difference of the rolling direction force.

The measurement of the rolling direction force by the load detection device is performed as follows. A specific description will be given with reference to FIG. FIG. 1 is a diagram showing a rolling apparatus.
1 is supported by an upper work roll 1 supported by an upper work roll chock 5, an upper reinforcement roll 3 supported by an upper reinforcement roll chock 7 that reinforces the upper work roll 1, and a lower work roll chock 6. The lower work roll 2 and the lower reinforcement roll 4 supported by the lower reinforcement roll chock 8 that reinforces the lower work roll 2 are provided, and a reduction device 13 is provided. The metal plate 21 is rolled in the rolling direction 22.
Although FIG. 1 basically shows only the apparatus configuration on the work side, a similar apparatus exists on the drive side.

  The rolling direction force acting on the upper work roll 1 of the rolling apparatus is basically supported by the upper work roll chock 5, and the upper work roll chock 5 has an upper work roll chock outlet load detection device 109 and an upper work roll inlet load. A detection device 110 is provided, and these load detection devices 109 and 110 act between the upper work roll chock 5 and a member such as a project block (not shown) that fixes the upper work roll chock 5 in the rolling direction. The force to do can be measured. These load detection devices 109 and 110 are usually preferably configured to measure the compressive force in order to simplify the device configuration. In the upper work roll rolling direction force calculation device 14, the difference between the measurement results of the upper work roll unloading side load detection device 109 and the upper work roll entry side load detection device 110 is calculated, and the rolling direction force acting on the upper work roll chock 5 is calculated. Is calculated. Further, the rolling direction force acting on the lower work roll 2 is also measured by the lower work roll outlet load detecting device 111 and the lower work roll inlet load detecting device 112 provided on the outlet side and the inlet side of the lower work roll chock 6. Based on the value, the lower work roll rolling direction force calculation device 15 calculates the rolling direction force acting on the lower work roll chock 6.

Japanese Patent No. 4214150 JP 2007-260775 A

  The load detection device is not particularly specified in the above-mentioned prior art documents, but is a load cell in consideration of notation on the drawing and technical common sense in the rolling field. The load cell that measures the rolling direction force is installed between the roll chock and a member such as a project block that supports the roll chock in the rolling direction. Load cells are limited in size and are difficult to attach to a roll chock and are usually only attached to project blocks. In order to install the load cell in the project block, not only the load cell body but also a housing including the project block needs to be remodeled on a large scale, and the investment scale is large.

  The rolling direction force applied to the work roll chock is measured by bringing the work roll chock and the load cell into contact with each other, and the work roll chock moves up and down according to the thickness of the plate material to be rolled. As the work roll chock moves up and down, the point of action of the rolling direction force also moves up and down. In order to accurately measure the rolling direction force, it is necessary to strictly manage the positional relationship between the load cell and the project block in contact with the load cell. Conversely, it is necessary to manage the plate thickness of the plate so as to be within the management range. Furthermore, if the plate thickness of the plate exceeds the control range, it affects the measurement accuracy of the rolling direction force, and thus affects the camber and warpage control accuracy.

  In view of such a situation, the present invention can be deployed only by (1) minor modification of the work roll chock, and does not require large-scale modification of the housing including the project block; (2) of the plate material to be rolled Even if the plate thickness changes, it is possible to accurately measure the elastic strain caused by the rolling direction force always acting on the work roll chock; and based on the simple and accurately measured elastic strain, Similarly, (3) it is possible to prevent the occurrence of camber by manipulating the rolling leveling; (4) controlling the vertical asymmetric component control amount of the rolling device, so that there is no warping, or It is possible to carry out rolling of a metal plate with a very small warpage; (5) Furthermore, even when the plate thickness is zero, that is, in a kiss roll state, the pressure acting on the work roll chock Provided is a rolling device and a rolling method capable of accurately measuring an elastic strain caused by a directional force and capable of realizing a highly accurate reduction leveling zero point setting based on the accurately measured elastic strain. For the purpose.

  The gist of the present invention for solving the problems of the prior art as described above is as follows.

  (1) In a rolling apparatus having at least a pair of upper and lower work rolls and a reinforcing roll, strain measuring means for measuring elastic strain in the rolling direction generated on the entry side and the exit side of the work side roll chock and the drive side roll chock of the work roll. A rolling apparatus comprising:

  (2) The rolling apparatus according to (1), wherein the strain measuring means is a piezo element or a strain gauge.

  (3) The rolling apparatus according to (1) or (2), wherein the strain measuring means transmits a measurement signal wirelessly.

  (4) A work roll chock elastic strain calculation device that calculates elastic strain of the work roll chock due to rolling direction force from the elastic strain on the entry side and the exit side measured by the strain measuring means, and the work side roll chock and the drive side roll chock A left-right elastic strain difference calculation device that calculates the difference between the elastic strains acting, and a reduction leveling control that calculates a control amount of the reduction device on the working side and the drive side of the rolling device based on the calculated values of the left-right elastic strain difference calculation device And a reduction leveling control device that controls the work-side and drive-side reduction devices of the rolling device based on the calculated values of the reduction leveling control amount calculation device (1). ) To (3).

  (5) A work roll chock elastic strain calculation device that calculates elastic strain of the work roll chock due to rolling direction force from the input and output elastic strains measured by the strain measuring means, and the upper work roll chock and the lower work roll chock A vertical elastic strain difference calculation device for calculating the difference between elastic strains acting on the upper and lower elastic strain difference calculation device, and a vertical asymmetric component control amount calculation for calculating the vertical asymmetric component control amount of the rolling device based on the calculation value of the vertical elastic strain difference calculation device (1) to (1), comprising: a device and a vertical asymmetric component control device that controls a vertical asymmetric component control amount of the rolling device based on a calculated value of the vertical asymmetric component control amount calculation device. The rolling apparatus according to any one of 3).

(6) The strain measuring means is a rolling device which is a strain measuring means for measuring elastic strain in the rolling direction in a kiss roll state,
Work roll chock elastic strain calculation device for calculating elastic strain of the work roll chock due to rolling direction force from the elastic strain on the entry side and the exit side measured by the strain measuring means, and the elasticity acting on the work side roll chock and the drive side roll chock A left-right elastic strain difference calculation device that calculates a difference in strain, and a reduction leveling control amount calculation device that calculates a control amount on the working side and the drive side of the rolling device based on the calculated values of the left-right elastic strain difference calculation device And a rolling leveling control device that controls the rolling device on the working side and the driving side of the rolling device based on the calculated value of the rolling leveling control amount computing device.
In the reduction leveling control device, the sum of the reaction forces on the working side and the driving side in the kiss roll state is set to a value within a range of ± 2% around a predetermined value, and the roll chock on the work side of the work roll Further, the control amount of the reduction device on the working side and the driving side of the rolling device is calculated so that the difference between the left and right elastic strains acting on the driving side roll chock is within ± 5% of the average elastic strain on the working side and the driving side. The rolling apparatus according to any one of (1) to (3), wherein

  (7) Instead of the work roll chock elastic strain calculation device, a circuit for calculating a strain difference on the entry / exit side is provided, and the strain difference is transmitted as an elastic strain of the work roll chock due to a rolling direction force. The rolling apparatus according to any one of 4) to (6).

  (8) Any one of (1) to (7), characterized in that a pressing device for pressing the work roll chock in the rolling direction is provided on either the entry side or the exit side of the work roll chock in the rolling direction. The rolling apparatus as described in one.

  (9) Of the work side roll chock and the drive side roll chock, the work side roll chock and the drive side roll chock are arranged on the opposite side to the side where the work roll is offset with respect to the reinforcing roll as a reference. The rolling apparatus according to any one of (1) to (7), further comprising a pressing device for pressing in the rolling direction.

  (10) The rolling device according to (8) or (9), wherein the pressing device has a function of detecting a rolling direction force and detecting an elastic strain of the work roll chock based on the rolling direction force.

  (11) In a rolling method of a metal plate material performed using a rolling device having at least a pair of upper and lower work rolls and a reinforcing roll, rolling directions generated on the entry side and the exit side of the work side roll chock and the drive side roll chock of the work roll A rolling method for measuring the elastic strain.

  (12) The rolling method according to (11), wherein the strain measuring means is a piezo element or a strain gauge.

  (13) The rolling method according to (11) or (12), wherein the strain measuring means transmits a measurement signal wirelessly.

(14) The work side roll chock and the drive side roll chock of the work roll by the rolling direction force based on the measured values of the elastic strain in the rolling direction generated on the entry side and the exit side of the work side roll chock and the drive side roll chock of the work roll The elastic strain of the left and right elastic strains are further calculated,
Based on the calculated value of the left and right elastic strain difference, the rolling device work side and the drive side reduction device control amount is calculated,
The rolling method according to any one of (11) to (13), wherein the work-side and drive-side rolling devices of the rolling device are controlled based on the calculated value of the rolling device control amount.

(15) The upper roll chock and the lower roll chock of the work roll due to the rolling direction force based on the measured values of the elastic strain in the rolling direction generated on the entry side and the exit side of the upper work roll chock and the lower work roll chock of the work roll The elastic strain is calculated, and the difference between the upper and lower elastic strains is calculated,
Based on the calculated value of the vertical elastic strain difference, the vertical asymmetric component control amount of the rolling device is calculated,
The rolling method according to any one of (11) to (13), wherein the vertical asymmetric component control amount of the rolling device is controlled based on the calculated value of the vertical asymmetric component control amount.

(16) The sum of the reaction forces on the working side and the driving side in the kiss roll state is set to a value within a range of ± 2% around a predetermined value,
Measure the elastic strain in the rolling direction generated on the entry side and the exit side of the work side roll chock and the drive side roll chock in the kiss roll state,
Based on the entry side and exit side elastic strain, calculate the elastic strain of the work side roll chock and the drive side roll chock of the work roll due to rolling direction force,
Based on the calculated elastic strain values on the working side and the driving side, the difference between the left and right elastic strains is calculated,
The left and right reduction position of the rolling device is set so that the difference between the left and right elastic strains is within a range of ± 5% of the average elastic strain on the working side and the driving side,
The rolling method according to any one of (11) to (13), wherein the set reduction position is set as an initial reduction position.

  (17) The elastic strain in the rolling direction generated on the entry side and the exit side of the work roll is measured, the strain difference on the entry / exit side is calculated, and the strain difference is transmitted as the elastic strain of the work roll chock due to the rolling direction force. The rolling method as described in any one of (14)-(16) characterized by the above-mentioned.

  (18) The rolling according to any one of (11) to (17), wherein the work roll chock is pressed against either the entry side or the exit side of the work roll chock in the rolling direction. Method.

  (19) Of the work side roll chock and the drive side roll chock, the work side roll chock and the drive side roll chock are from the opposite side to the side where the work roll is offset with respect to the reinforcing roll as a reference in the rolling direction entry side and exit side. The rolling method according to any one of (11) to (17), wherein pressing is performed in a rolling direction.

  (20) The rolling method according to (18) or (19), wherein the pressing means has a function of detecting a rolling direction force and detecting an elastic strain of the work roll chock based on the rolling direction force.

  According to the present invention, (1) it can be deployed with only minor modifications of the work roll chock, and no large-scale modification of the housing including the project block is required. Since it is not necessary to route the lead wires in a complicated manner (wiring routing) so as not to interfere with each other, restrictions on the arrangement of the equipment are further reduced; (2) Even if the thickness of the plate material to be rolled changes, the work roll chock can always be used. It is possible to accurately measure the elastic strain caused by the acting rolling direction force; and (3) operating the reduction leveling as in the past based on the simple and accurately measured elastic strain. Therefore, it is possible to prevent the occurrence of camber; (4) No warpage by controlling the control amount of the asymmetrical component of the rolling device Alternatively, it is possible to carry out rolling of a metal plate having a slight warpage; (5) Furthermore, even when the plate thickness is zero, that is, in a kiss roll state, elastic strain caused by the rolling direction force acting on the work roll chock is reduced. Provided are a rolling device and a rolling method that can be measured accurately and can realize the zero point setting of the rolling leveling with extremely high accuracy based on the accurately measured elastic strain.

FIG. 1 is a diagram for explaining measurement of rolling direction force by a conventional load detection device. FIG. 2 is a diagram schematically showing a preferred embodiment of the rolling apparatus used in the present invention. FIG. 3 is a diagram for explaining the measurement of elastic strain by the strain measuring means. FIG. 4 is a diagram schematically showing a preferred embodiment of the metal sheet rolling apparatus of the present invention described in (8). FIG. 5 is a diagram schematically showing a preferred embodiment of the metal sheet rolling apparatus of the present invention described in (9). FIG. 6 is a diagram for explaining meandering / camber control, warpage control and zero point adjustment means based on the measurement of the rolling direction force. FIG. 7 is a diagram schematically illustrating a rolling device used in the tests of the comparative example and the example. FIG. 8 is a diagram showing a comparison of the signal strengths of the load cell of the comparative example and the strain measuring means of the example.

Embodiments of the present invention will be described below.
FIG. 2 is a diagram schematically showing a preferred embodiment of the rolling apparatus used in the present invention. The rolling apparatus of the present invention shown in FIG. 2 is a rolling apparatus 23 having at least a pair of upper and lower work rolls 1 and 2 and reinforcing rolls 3 and 4, and the work side roll chock of the work roll roll chocks 5 and 6. And strain measuring means 9, 10, 11, 12 for measuring elastic strain in the rolling direction generated on the entry side and the exit side of the drive side roll chock.
The rolling direction force acting on the work rolls 1 and 2 of the rolling apparatus is basically supported by the work roll chocks 5 and 6, and the work roll chocks 5 and 6 are fixed in the rolling direction by members such as the project block 24. Yes. Therefore, the force acting on the work roll chocks 5 and 6 causes the work roll chocks 5 and 6 to generate elastic strain in the rolling direction, which can be measured by the strain measuring means. That is, the rolling direction force acting on the work roll chocks 5 and 6 can be obtained based on the measured value of elastic strain.
The strain measuring means 9, 10, 11, 12 are provided on both the exit side and the entry side of the work roll chock. In order to measure the elastic strain of the work roll chock due to the rolling direction force, strain measuring means is provided on both the exit side and the entrance side, and the difference between the elastic strains on the exit side and the entrance side is taken, so that the work roll chock is in the rolling direction. Regardless of which direction the force acts on, the accuracy of elastic strain obtained by calculation can be increased. However, depending on the embodiment, either the upper or lower outlet side or the inlet side or a combination thereof may be omitted. For example, as will be described later, either the outgoing side or incoming side strain measuring means may be replaced with a hydraulic device having a load detecting function. Based on the rolling direction force detected by the load detection function of the hydraulic device, it can be converted into elastic strain generated in the roll chock, which can be used for calculating the rolling direction force as a substitute for the replaced strain measuring means. can do. Further, by pressing the roll chock with the hydraulic device, it is possible to stabilize the position of the roll chock in the rolling direction and further improve the responsiveness and accuracy of measurement of the rolling direction force acting on the roll chock.

FIG. 3 is a diagram for explaining the measurement of elastic strain by the strain measuring means. Referring to FIG. 3, the strain measuring means 304 is provided in the work roll chock 301 for measuring the strain generated in the rolling direction during the rolling.
In FIG. 3, the strain measuring means 304A and B are inserted and arranged at the bottom of the hole formed in the work roll chock 301, and then the holes are closed by bolts 305A and B, and the strain measuring means 304A and B are fixed. Yes. Lead wires 306A, B by the strain measuring means 304A, B are passed through the bolts 305A, B and drawn to the outside. The strain measuring means 304A and 304B have a range 309 in which the vertical direction is centered on the roll shaft center height 308 and the roll shaft diameter from the upper part of the roll shaft to the lower part of the roll shaft, and the axial direction is centered on the rolling support point position 310 It is preferable to arrange in the range 311 of the roll shaft storage length. The depth of the holes for attaching the strain measuring means 304A, 304B is preferably about 5 mm from the rolling direction force acting position 307 to the length from the rolling direction force acting position 307 to the roll chock end surface 312 with reference to the rolling direction force acting position 307. It should be about half.

  The strain measuring means described above can be deployed only with minor modifications of the work roll chock, and does not require a large-scale modification of the housing including the project block, thereby reducing the investment scale.

  The strain measuring means is provided in the hole of the work roll chock and moves together with the work roll chock. That is, even if the plate thickness of the plate to be rolled changes, the strain measuring means also moves up and down in accordance with the change in the plate thickness. Therefore, it is possible to accurately measure the elastic strain caused by the rolling direction force always acting on the work roll chock. The conventional load cell sandwiched between the work roll chock and the project block had to strictly manage the positional relationship of each device, but the strain measuring means of the present invention requires such strict management. Absent. Furthermore, the degree of freedom of the plate thickness is improved.

The strain measuring means in the rolling apparatus of the present invention described in (2) may be a piezo element or a strain gauge.
The piezo element is also called a piezoelectric element, and is a passive element using a piezoelectric effect that converts a force applied to a piezoelectric body into a voltage or converts a voltage into a force.
A strain gauge has a structure in which a metal resistor (metal foil) laid out in a zigzag shape is mounted on a thin insulator, and it is converted into a strain amount by measuring the change in electrical resistance due to deformation. Can do. As the measurement principle, when the object to be measured is deformed, the strain gauge is also deformed at the same rate, and the thin metal resistor of the strain gauge is reduced in cross-sectional area due to elongation and lengthened, resulting in an increase in resistance value. Measure the distortion using.
Piezo elements and strain gauges are much smaller than load cells, which are conventional load detector devices, can be deployed in roll chocks as described above, do not require large-scale modifications, and are related to equipment deployment. There are few administrative restrictions.

The strain measuring means in the rolling apparatus of the present invention described in (3) is characterized by transmitting a measurement signal wirelessly.
This aspect will be described. First, the elastic strain caused by the force acting on the work roll chock is measured. The measurement signal is appropriately modulated and input to the antenna. The radio wave is transmitted from the antenna to the outside of the roll chock. The signal transmitted to the receiver is used for later calculation and can be reflected in the control. More specifically, for example, by calculating the difference between the elastic strain on the output side and the input side of this signal, that is, calculating the elastic strain generated in the work roll chock due to the rolling direction force, based on this elastic strain, Various controls such as warp and kiss roll zero tone can be performed. The wireless communication method is not particularly limited. As an example of the wireless communication means, a short-range wireless communication standard such as Bluetooth may be used, or communication using a wireless LAN or infrared communication may be performed.
According to this aspect, it is possible to easily acquire the measurement signal of the roll chock distortion caused by the applied rolling direction force at high speed and in real time with a simple and small configuration. In addition, according to this aspect, restrictions on device arrangement (positional relationship between devices such as roll chock and project block) are further reduced, that is, the lead wires 304A, B (connected to the strain measurement means 304A, B described above. 3) is not necessary, and it is not necessary to route the lead wires in a complicated manner (wiring routing) so as not to interfere with the operating rolling apparatus. These are very useful for improving the working environment and reducing costs.

  The rolling device of the present invention described in (4) includes a work roll chock elastic strain calculation device that calculates the elastic strain of the work roll chock due to a rolling direction force from the elastic strain on the entry side and the exit side measured by the strain measuring means. A left and right elastic strain difference calculation device for calculating a difference between elastic strains acting on the work side roll chock and the drive side roll chock, and a work side and a drive side of the rolling device based on the calculated values of the left and right elastic strain difference calculation device A rolling leveling control amount computing device that computes a rolling device control amount, and a rolling leveling control device that controls the working side and driving side rolling devices of the rolling device based on the calculated value of the rolling leveling control amount computing device. It is characterized by having.

  In general, as a cause of causing camber by rolling the plate material, roll gap setting failure, entry side plate thickness left-right difference or deformation resistance left-right difference of the material to be rolled, etc., in any case, ultimately, By producing a left-right difference in the elongation strain in the rolling direction caused by rolling, the advance rate and the reverse speed change in the sheet width direction, causing a left-right difference in the exit side speed and the entry side speed of the rolled material, resulting in camber. At this time, for example, when rolling the tip of the rolled material that is likely to cause camber, the length of the rolled material on the exit side that has already been rolled is short, so there is a left-right difference in the exit speed in a relatively free state. In order to produce a difference in left and right, it is necessary that the entire rolled material existing on the entry side rotates rigidly in a horizontal plane. However, at the time of rolling the tip part, since a long unrolled material generally remains on the entry side, a moment against the rotation of the rigid body is generated due to the friction between the weight of the rolled material itself and the table roller. Since this moment is transmitted as a reaction force to the work roll of the rolling apparatus, a difference in the rolling direction acting on the work roll chock part is produced, so that it is finally supported. This principle is the same when rolling the tail end of the rolled material, where the camber is likely to occur next after the rolling of the rolled end of the rolled material. Because it is long, a moment to resist this is generated mainly from the rolled material on the outlet side when trying to create a lateral difference in elongation strain and advanced rate, which is transmitted as a reaction force to the work roll, and also acts on the work roll chock part By producing a left-right difference in the rolling direction force to be performed, it is finally supported.

  The rolling direction force acting on the work roll chock part causes elastic strain in the rolling direction on the work roll chock, which can be measured by a strain measuring means. That is, the rolling direction force acting on the work roll can be obtained based on the measured value of elastic strain.

  According to the rolling device of the present invention described in (4), the elastic strains on the entry side and the exit side acting on the work side and drive side roll chocks of the work roll are measured, and the elastic strains on the entry side and the exit side are measured. By calculating the elastic strain of the work roll chock due to the rolling direction force, it is possible to calculate the difference between the elastic strain on the working side and the elastic strain on the driving side, that is, the difference between the left and right elastic strains. Can be detected. This moment is generated only when the left-right difference in elongation strain (rolled material) that causes camber occurs as described above, and the moment also occurs almost simultaneously with the occurrence of the elongation strain difference. By controlling the left-right asymmetric component of the roll opening of the rolling device, that is, the rolling leveling, in the direction of reducing the left-right elastic strain difference (roll roll chock), and hence the rolling direction force left-right difference, the occurrence of camber can be prevented in advance. Is possible.

  The rolling apparatus according to (5) includes a work roll chock elastic strain calculation device that calculates elastic strain of the work roll chock due to a rolling direction force from the elastic strain on the entry side and the exit side measured by the strain measurement unit; A vertical elastic strain difference calculation device that calculates the difference between elastic strains acting on the work roll chock and the lower work roll chock, and a vertical asymmetric component control amount of the rolling device is calculated based on the calculated values of the vertical elastic strain difference calculation device And a vertical asymmetric component control device that controls a vertical asymmetric component control amount of the rolling device based on a calculation value of the vertical asymmetric component control amount calculation device. And

  In general, the causes of warpage due to rolling are as follows: 1) Vertical difference Δμ in friction coefficient between work roll and rolled material, 2) Vertical temperature difference of rolled material (upper / lower difference in deformation resistance) Δt, 3) Upper and lower work roll circumference Difference in speed ΔV, 4) Geometric conditions and the like, but in any case, the advance rate and the reverse rate are finally generated by causing a vertical difference in the elongation strain in the rolling direction caused by rolling. It changes in the sheet thickness direction, causing a vertical difference in the exit side speed and the entrance side speed of the rolled material, and warping occurs. At this time, for example, when rolling the tip of the rolled material that is likely to be warped, the length of the rolled material on the exit side that has already been rolled is short, so it is relatively free to cause a vertical difference in the exit speed. In order to cause a vertical difference in the entry side speed, it is necessary to rigidly rotate the entire rolled material existing on the entry side in the vertical direction. However, since a long unrolled material generally remains on the entry side during the tip rolling, a moment against the rigid body rotation is generated due to the restraint between the weight of the rolled material itself and the table roller. This moment is transmitted as a reaction force in the rolling direction to the work roll chock of the rolling apparatus, and is finally supported by causing a vertical difference in the rolling direction force acting on the work roll chock portion.

  The rolling direction force acting on the work roll chock part causes elastic strain in the rolling direction on the work roll chock, which can be measured by a strain measuring means. That is, the rolling direction force acting on the work roll can be obtained based on the measured value of elastic strain.

  In the rolling apparatus described in (5), the roll chocks 5 and 6 of both the upper and lower work rolls are provided with strain measuring means 9, 10, 11 and 12, so that the roll chocks on the upper and lower entry sides and the exit side are provided. The elastic strain acting on 5 and 6 can be measured. Based on the measured value of the elastic strain, the elastic strain acting on both the upper and lower work rolls 1 and 2 can be obtained. In addition, since an arithmetic device for calculating the difference between the upper and lower elastic strains acting on the work roll chocks 5 and 6 is provided, the upper and lower elastic strain difference can be calculated. From this vertical elastic strain difference, it is possible to detect the moment acting mainly from the entry-side rolled material during tip rolling. This moment is generated when a vertical difference in elongation strain that causes warpage occurs, and the moment is also generated almost simultaneously with the occurrence of the elongation strain difference. Therefore, it is possible to prevent the occurrence of warpage by operating the vertical asymmetric component of the rolling device, for example, with the roll peripheral speed or torque in the direction of reducing the elastic strain and thus the vertical difference of the rolling direction force. Become. The rolling apparatus described in (5) detects the vertical difference in the rolling direction force as a vertical elastic strain difference acting on the work roll chock, and equalizes the elongation strain vertically based on the vertical elastic strain difference. And a control device for controlling the vertical asymmetric component control amount of the rolling apparatus based on the calculated value of the vertical asymmetric component control amount. Thereby, in rolling of a metal plate material, it is possible to prevent the occurrence of a vertical difference in elongation strain and to perform rolling of a metal plate material with no warpage or a slight warpage.

  In addition, as the vertical asymmetric component control amount, the roll speed of the rolling device, the friction coefficient between the rolling roll and the material to be rolled, the temperature difference between the upper and lower surfaces of the material to be rolled, the incident angle of the material to be rolled, Any one of the horizontal positions may be used, or a combination thereof. As the vertical asymmetric component control device, a roll speed control device, a lubricant supply amount control device, a temperature control device, a roller table height control device, and a roll chock horizontal position control device corresponding to the vertical asymmetric component control amount Any one of them or a combination thereof may be used. In any case, a light metal plate having no warpage or extremely warpage can be stably produced without measuring the rolling torque of the upper and lower rolls.

The rolling apparatus according to (6) is a rolling apparatus in which the strain measuring unit is a strain measuring unit that measures elastic strain in a rolling direction in a kiss roll state,
Furthermore, it acts on the work roll chock elastic strain calculation device that calculates the elastic strain of the work roll chock due to the rolling direction force from the elastic strain on the entry side and the exit side measured by the strain measuring means, and the work side roll chock and the drive side roll chock A left and right elastic strain difference calculation device that calculates the difference between elastic strains to be performed, and a reduction leveling control amount that calculates a reduction device control amount on the working side and the drive side of the rolling device based on the calculated value of the left and right elastic strain difference calculation device A reduction leveling control device that controls the reduction device on the working side and the drive side of the rolling device based on the calculation value of the calculation device and the reduction leveling control amount calculation device,
In the reduction leveling control device, the sum of the reaction forces on the working side and the driving side in the kiss roll state is set to a value within a range of ± 2% around a predetermined value, and the roll chock on the work side of the work roll Further, the control amount of the reduction device on the working side and the driving side of the rolling device is calculated so that the difference between the left and right elastic strains acting on the driving side roll chock is within ± 5% of the average elastic strain on the working side and the driving side. It is characterized by that.

  In the rolling apparatus of (4) described above, the amount of control during rolling can be calculated to suppress the occurrence of camber. That is, after the start of rolling, the control effect is exhibited after the start of control, but it does not contribute to the suppression of the camber at the most advanced portion that is rolled before the start of control. Further, before the rolled material exits the rolling apparatus, that is, immediately before the end of rolling, it is necessary to end the control from the viewpoint of control stability, and the reduction position is returned to the initial reduction position after the end of the control. Therefore, if the initial reduction position (zero point position) is mistaken, it may cause a camber also at the tail end portion of the rolled material.

  Conventionally, in order to adjust the initial reduction position (zero point position), adjustment using a kiss roll has been performed. The kiss roll tightening means that the upper and lower work rolls are brought into contact with each other and a load is applied between the rolls in the absence of the rolled material. When the kiss roll is tightened, the measured value of the rolling load, that is, the reaction force from the reinforcing roll acting in the reduction direction, is adjusted so as to match the predetermined zero adjustment load on each of the working side and the driving side. Yes. However, the zero point position adjustment by this kiss roll may not bring about an appropriate zero point position adjustment.

  In general, the reason why the zero point position adjustment by the kiss roll is not appropriate is that the rolls cross between the work roll and the reinforcing roll, or between the upper and lower work rolls in the kiss roll state (the state where the kiss roll is tightened). In this case, a thrust force (a force acting in the roll axis direction) is generated between the rolls. This thrust force gives an extra moment to the roll, and the distribution of the contact load between the rolls in the roll axial direction changes so as to balance this moment. This eventually appears as a disturbance with respect to the difference between the working side and the driving side of the load cell for measuring the rolling load and does not bring about an appropriate zero point position adjustment. The cross angle between the rolls is generated by a slight gap existing between the housing and the roll chock even if it is not consciously set as in a pair cross rolling device, so that the roll thrust force can be controlled to zero. Have difficulty.

However, the present inventor noted that the rolling direction force is generated even in the zero point position adjustment by the conventional kiss roll, and that the rolling direction force is not affected by the roll thrust force, and the rolling reduction including the rolling direction force is taken into account. It has been found that high-precision zero adjustment is possible by performing zero adjustment. The details are as follows.
(A) The reinforcing roll reaction force acting in the reduction direction is affected by the inter-roll thrust force, and the difference between the working side and the driving side changes significantly. However, the difference between the working side and the driving side in the rolling direction force (and the accompanying elastic strain in the rolling direction of the roll chock) acting on the work side and drive side roll chock of the work roll is not affected by the thrust force between the rolls. Almost no change.
(B) Specifically, when a cross angle is generated between the rolls, the difference between the working side and the driving side of the reinforcing roll reaction force acting in the reduction direction varies depending on the direction and magnitude of the cross angle. However, the difference between the working side and the driving side in the rolling direction force (elastic strain) of the work roll is almost constant without being affected by the change in the direction and size of the cross angle.
(C) That is, the difference between the working side and the driving side in the rolling direction force (elastic strain) of the work roll is substantially zero, and actually within ± 5% of the average value of the rolling direction force (elastic strain) on the working side and the driving side ( Alternatively, the thrust force between the rolls can be adjusted by adjusting the zero point of the differential pressure leveling on the working side and the driving side so that the rolling direction force (elastic strain) on the working side and the driving side is within ± 2.5%. Even if is acting, it is not affected and high-precision reduction zero tone is possible.

  The rolling apparatus of (6) has strain measuring means 9, 10, 11, 12 on the work side of the upper and lower work rolls 1, 2 and the work side of the roll chock 5, 6 and on the entry side and the exit side of the drive side. If a kiss roll state is set for zero reduction before rolling, not only a rolling direction force but also a rolling direction force is generated due to driving torque and offset. The strain measuring means 9, 10, 11, 12 can measure the elastic strain on the entry side and the exit side of the roll chock 5, 6 of the work rolls 1, 2 in the kiss roll state in the rolling direction. The difference between the measured elastic strains on the entry side and the exit side is taken as the elastic strain of the work roll chock due to the rolling direction force, and the elastic strain acting on the work side and the drive side is calculated, The difference between the elastic strain and the elastic strain on the drive side, that is, the left-right elastic strain difference can be calculated.

  In order to adjust the zero point, the reduction devices 13 on the working side and the driving side are simultaneously operated and tightened until the sum of the left and right of the reinforcing roll reaction force reaches a predetermined value (zero tone load). In this state, a leveling operation is performed to make the difference between the working side and the driving side of the rolling direction force zero. Therefore, the control amount of the reduction device 13 on the working side and the driving side of the rolling device is calculated based on the difference between the left and right elastic strains, and the reduction on the working side and the driving side of the rolling device is calculated based on the calculated value of the control amount. The device 13 is controlled.

  The predetermined value (zero tone load) as the sum of the left and right of the reinforcing roll reaction force is set as a load value comparable to the load generated during actual rolling. In an actual rolling apparatus, about 50% of the rated rolling load is set to be the actual rolling load, so it may be set to any value from 15% to 85% of the rated rolling load, for example. Preferably, it may be set to any value from 30% to 70% of the rated rolling load.

  The setting error is preferably within a range of ± 2% around a predetermined value (zero-tone load). If it is greater than 2%, the reduction in the amount of reduction will be too large, and the plate thickness and shape will tend to be poor. There is no problem if it is within the range of ± 2% in actual rolling. Of course, the error should be as small as possible, preferably ± 1% or less. It is preset according to the rolling material and rolling conditions. Although details about the setting method are omitted here, a method set in a normal rolling operation may be used.

  Subsequently, based on the calculation result of the left-right elastic strain difference (difference between the working side and the driving side) described above, the difference between the working side and the driving side of the elastic strain (and thus the rolling direction force) acting on the work roll chocks 5 and 6 is calculated. The control amount of the reduction device 13 is calculated by the reduction leveling control amount calculation device so as to become zero and maintain the zero load. At this time, it is ideal that the difference between the working side and the driving side of the elastic strain (rolling direction force) is substantially zero. Actually, there is no problem as long as it is ± 5% or less of the average elastic strain (rolling direction force) on the working side and the driving side in consideration of measurement errors and setting accuracy. Preferably, it is ± 4% or less, more preferably ± 3% or less, and further preferably 2% or less.

  And based on this control amount calculation result, the reduction device 13 is operated by a reduction leveling control device (not shown) to control the reduction position of the roll of the rolling device. As a result, the difference between the working side and the driving side of the elastic strain caused by the rolling direction force acting on the work roll chocks 5 and 6 becomes zero, and the reduction position at that time is set to the reduction position of the working side and the driving side separately. Zero point. As described above, since the difference between the working side and the driving side of the rolling direction force acting on the work roll chocks 5 and 6 is not affected by the thrust force, even if a thrust force is generated between the rolls, it is extremely highly accurate. The zero point setting of the reduction leveling can be realized.

The rolling device of (7) includes a circuit for calculating a strain difference on the entry / exit side instead of the work roll chock elastic strain calculation device, and transmits the strain difference as an elastic strain of the work roll chock due to a rolling direction force. Features.
In the invention described in (7), the elastic strain of the work roll chock due to the rolling direction force is transmitted after obtaining the difference between the detected values of the strain measuring means on the entry / exit side. As a result, an arithmetic circuit is required in or near the chock, but the number of transmission means can be reduced. Especially when transmitting wirelessly, the number of wireless means can be reduced. That is, the detection value from the distortion measuring means may be transmitted as it is (without being calculated) by the two transmission / reception transmission means, or as shown in this embodiment, the difference between the input / output sides is taken and the difference is taken. May be transmitted as the elastic strain of the work roll chock due to the rolling direction force.

  FIG. 4 shows a preferred embodiment of the metal sheet rolling apparatus of the present invention described in (8). In the rolling apparatus for the metal plate material of FIG. 4, the entry side work roll chock pressing device 27 is provided adjacent to the upper work roll entry side strain measuring means 10 on the entry side of the upper work roll chock 5. Is pressed to the exit side with a predetermined pressing force. By adopting such a configuration, it is possible to stabilize the position in the rolling direction of the upper work roll chock 5 and improve the responsiveness and accuracy of measurement of elastic strain caused by the rolling direction force acting on the upper work roll chock 5. . In the rolling apparatus shown in FIG. 5, the entry side work roll chock pressing device 27 is a hydraulic device. With this configuration, the work roll chock vibrates instantaneously in the rolling direction as in the case of biting the rolling material. Even in such a case, it is possible to stabilize the movement of the work roll chock by applying a stable pressing force. Although only the upper work roll 5 has been described, the lower work roll 6 can be configured in the same manner.

  FIG. 5 shows a preferred embodiment of the metal sheet rolling apparatus of the present invention described in (9). In the rolling apparatus for the metal plate material of FIG. 5, the upper work roll 5 is offset by Δx in the exit direction. Since the offset component force is generated as the horizontal component force of the rolling load due to the work roll offset, the position of the work roll chock in the rolling direction can be stabilized. Furthermore, in the metal sheet rolling apparatus shown in FIG. 5, the entry work roll chock pressing device 27 is provided on the entry side of the upper work roll chock 5. With this arrangement, the offset force acting on the upper work roll 1 from the upper reinforcing roll 3 acts on the project block in the same direction as the pressing device against the project block. The force can be reduced, and the equipment can be made compact and inexpensive. Moreover, since the force which pinches | interposes the upper work roll chock 5 can be made small simultaneously, the disturbance factor of other control can also be restrained small. Furthermore, since the pressing force and the offset force by the pressing device are in the same direction, the pressing force and the offset force do not cancel each other and always press in the same direction, so that the rolling direction position can be stabilized. . Although only the upper work roll 5 has been described, the lower work roll 6 can be configured in the same manner.

  5, the entry side work roll chock pressing device 27 is a hydraulic device, and a sensor (not shown) for measuring the pressure of hydraulic oil supplied to the hydraulic cylinder is provided. This is an example in which the hydraulic device itself is used as a load detection device. Thereby, the pressing device can have a function of detecting the rolling direction force. The rolling direction force acting on the roll chock causes elastic strain of the roll chock, so the measured value of the elastic strain and the measured value of the rolling direction force are collated to improve the accuracy of the measured value of the elastic strain and there is no measurement abnormality It can be useful to detect or not.

  Next, the rolling method of the present invention will be described.

  The rolling method described in (11) is a method of rolling a metal sheet using a rolling device having at least a pair of upper and lower work rolls and a reinforcement roll, and includes the work side roll chock and the drive side roll chock of the work roll. The elastic strain in the rolling direction generated on the side and the outlet side is measured.

  The rolling direction force acting on the work roll of the rolling apparatus is basically supported by the work roll chock, and the work roll chock is fixed in the rolling direction by a member such as a project block. Accordingly, the force acting on the work roll chock causes elastic strain in the rolling direction to the work roll chock, and this can be measured by the strain measuring means. That is, the rolling direction force acting on the work roll chock can be obtained based on the measured value of elastic strain. In order to measure the elastic strain of the work roll chock due to the rolling direction force, the elastic strain generated on both the exit side and the entrance side is measured, and the difference between the elastic strains on the exit side and the entrance side is taken to roll into the work roll chock. Regardless of the direction in which the force is applied, the accuracy of elastic strain obtained by calculation can be increased. However, depending on the embodiment, either the measurement on the upper or lower exit side or the entry side or a combination thereof may be omitted. For example, as will be described later, either the outgoing side or incoming side strain measurement may be performed by the load detection function of the pressing means. Based on the rolling direction force detected by the load detecting function of the pressing means, it can be converted into elastic strain generated in the roll chock, and as a substitute for the omitted strain measurement, it can be used for the calculation for obtaining the rolling direction force. Can do. Also, by pressing the roll chock with the pressing means, the roll chock can be stabilized in the rolling direction position, and the responsiveness and accuracy of measurement of the rolling direction force acting on the roll chock can be further increased.

  The strain measuring means described above can be deployed only with minor modifications of the work roll chock, and does not require a large-scale modification of the housing including the project block, thereby reducing the investment scale.

  Further, the strain measuring means can be provided in the hole of the work roll chock and can be moved together with the work roll chock. That is, even if the plate thickness of the plate to be rolled changes, the strain measuring means can also move up and down in accordance with the change in the plate thickness. Therefore, it is possible to accurately measure the elastic strain caused by the rolling direction force always acting on the work roll chock. The conventional load cell sandwiched between the work roll chock and the project block had to strictly manage the positional relationship of each device, but the strain measuring means of the present invention requires such strict management. Absent. Furthermore, the degree of freedom of the plate thickness is improved.

  The strain measuring means in the rolling method described in (12) may be a piezo element or a strain gauge. Piezoelectric elements and strain gauges are very small compared to load cells that are conventional load detector devices, and can be deployed in roll chock as described above. There is no restriction on the positional relationship between devices such as roll chock and project block.

The strain measuring means in the rolling method of the present invention described in (13) is characterized in that a measurement signal is transmitted wirelessly.
This aspect will be described. First, the elastic strain caused by the force acting on the work roll chock is measured. The measurement signal is appropriately modulated and input to the antenna. The radio wave is transmitted from the antenna to the outside of the roll chock. The signal transmitted to the receiver is used for later calculation and can be reflected in the control. More specifically, for example, by calculating the difference between the elastic strain on the output side and the input side of this signal, that is, calculating the elastic strain generated in the work roll chock due to the rolling direction force, based on this elastic strain, Various controls such as warp and kiss roll zero tone can be performed. The wireless communication method is not particularly limited. As an example of the wireless communication means, a short-range wireless communication standard such as Bluetooth may be used, or communication using a wireless LAN or infrared communication may be performed.
According to this aspect, it is possible to easily acquire the measurement signal of the roll chock distortion caused by the applied rolling direction force at high speed and in real time with a simple and small configuration. In addition, according to this aspect, restrictions on device arrangement (positional relationship between devices such as roll chock and project block) are further reduced, that is, the lead wires 304A, B (connected to the strain measurement means 304A, B described above. 3) is not necessary, and it is not necessary to route the lead wires in a complicated manner (wiring routing) so as not to interfere with the operating rolling apparatus. These are very useful for improving the working environment and reducing costs.

  According to the rolling method described in (14), the elastic strain generated on the entry side and the exit side on the work side and the drive side of the work roll chock is measured, and the difference between the elastic strains on the entry side and the exit side is taken. Because it calculates the elastic strain of the work side roll chock and the drive side roll chock of the work roll due to the rolling direction force, and further calculates the difference between the elastic strain on the work side and the elastic strain on the drive side, that is, the elastic strain left-right difference, the cause of camber It is possible to detect the moment acting on the work roll from the rolled material due to the difference in left and right elongation strain in the rolling direction. This moment is generated only when the left-right difference of the elongation strain that causes the camber is generated, and the moment is also generated almost simultaneously with the generation of the elongation strain difference. Therefore, based on the calculated value of the left-right elastic strain difference, the rolling device control amount on the working side and the driving side of the rolling device is calculated in a direction to reduce the left-right elastic strain difference, and thus the rolling direction force left-right difference, It is possible to prevent the occurrence of camber by controlling the rolling device on the working side and the driving side of the rolling device based on the calculated value, that is, by operating the asymmetrical component of the roll opening of the rolling device, that is, the rolling leveling. It becomes possible.

  According to the rolling method described in (15), the elastic strains on the entry side and the exit side of both the upper and lower roll chocks generated by the rolling direction force acting on the roll chock of both the upper and lower work rolls are measured. The elastic strain of the upper roll chock and the lower roll chock of the work roll due to the rolling direction force is calculated by taking the difference between the elastic strain on the outlet side and the outlet side, and the difference between the upper side elastic strain and the lower side elastic strain, that is, the upper and lower elastic strains. The difference between is calculated. From this vertical elastic strain difference, it is possible to detect the moment acting mainly from the entry-side rolled material during tip rolling. This moment is generated only when an upper and lower difference in elongation strain causing warpage occurs, and the moment is generated almost simultaneously with the occurrence of the difference in elongation strain. Therefore, based on the calculated value of the vertical elastic strain difference, the vertical asymmetric component control amount of the rolling device is calculated in a direction to reduce the vertical elastic strain difference, and thus the vertical difference of the rolling direction force, and the calculated value The amount of control of the vertical asymmetry component of the rolling device is controlled based on the above, that is, the vertical asymmetric component of the rolling device, for example, the roll speed of the rolling device, the friction coefficient between the rolling roll and the material to be rolled, the temperature difference between the upper and lower surfaces of the material to be rolled. By controlling any one of the incident angle of the material to be rolled and the horizontal position of the upper and lower work roll chock, or a combination thereof, it is possible to prevent the occurrence of warpage.

  The rolling method described in (16) relates to a zeroing method for a rolling device, and particularly enables high-precision zeroing in the left-right asymmetric component of the rolling device. According to this method, the sum of the reaction forces on the working side and the driving side in the kiss roll state is set to a value within a range of ± 2% around a predetermined value, and the predetermined value (zero) Adjusting load) is set as a load value comparable to the load generated during actual rolling. In an actual rolling apparatus, about 50% of the rated rolling load is set to be the actual rolling load, so it may be set to any value from 15% to 85% of the rated rolling load, for example. Preferably, it may be set to any value from 30% to 70% of the rated rolling load. The setting error is within a range of ± 2% around a predetermined value (zero tone load). If it is greater than 2%, the reduction in the amount of reduction will be too large, and the plate thickness and shape will tend to be poor. There is no problem if it is within the range of ± 2% in actual rolling. Of course, the error should be as small as possible, preferably ± 1% or less.

  In the kiss roll state, not only the rolling direction force but also the rolling direction force is generated. Therefore, the elastic strain on the entry side and the exit side acting on the work side and the drive side of the roll chock of the work roll is measured, and this entry side and exit side are measured. The elastic strain of the work roll and the drive side roll chock of the work roll due to the rolling direction force is calculated by taking the difference in the elastic strain on the side, and the difference between the elastic strain on the work side and the elastic strain on the drive side, that is, the left and right elastic strain difference Is calculated.

  The horizontal reduction position of the rolling apparatus is set so that the difference between the left and right elastic strains is within a range of ± 5% of the average elastic strain on the working side and the driving side. Thereby, the difference between the working side and the driving side of the elastic strain caused by the rolling direction force acting on the work roll chock becomes substantially zero, and the reduction position at that time is set to the zero point of the reduction position separately for the working side and the driving side. To do. The difference between the work side and the drive side of the rolling direction force acting on the work roll chock is not affected by the thrust force, so even if thrust force is generated between the rolls, it is possible to achieve extremely accurate reduction leveling zero setting become.

  Ideally, the difference in elastic strain (rolling direction force) between the working side and the driving side is ideally zero, but in practice, the elastic strain on the working side and the driving side is taken into account in consideration of measurement errors and setting accuracy. There is no problem if it is ± 5% or less of the average (rolling direction force). Preferably, it is ± 4% or less, more preferably ± 3% or less, and further preferably 2% or less.

With reference to FIG. 6, the meandering / camber control (14), warpage control (15) and zero point adjusting means (16) of the present invention will be described more specifically.
The rolling mill includes an upper work roll 1 supported by an upper work roll chock 5, an upper reinforcement roll 3 supported by an upper reinforcement roll chock 5 that reinforces the upper work roll 1, and a lower work roll supported by a lower work roll chock 6. 2 and a lower reinforcement roll 4 supported by a lower reinforcement roll chock 7 that reinforces the lower work roll 2, and a reduction device 13. The metal plate 21 is rolled in the rolling direction 22.
FIG. 6 basically shows only the apparatus configuration on the work side, but there is a similar apparatus on the drive side.

  The rolling direction force acting on the upper work roll 1 of the rolling mill is basically supported by the upper work roll chock 5, but the upper work roll chock 5 has an upper work roll chock outlet side strain measuring means 9 and an upper work roll inlet side strain. A project block in which the measuring means 10 is provided and the upper work roll chock 5 is fixed in the rolling direction by taking the difference between the elastic strains on the entry side and the exit side measured by the strain measurement means 9, 10. The elastic strain of the work roll chock due to the force acting between a member such as (not shown) and the upper work roll chock 5 can be measured. In the upper work roll chock elastic strain calculation device 14, the difference between the measurement results of the upper work roll exit side strain measurement means 9 and the upper work roll entry side strain measurement means 10 is calculated, and elasticity due to the rolling direction force acting on the upper work roll chock 5 is calculated. Calculate distortion. Further, with respect to the elastic strain of the lower work roll chock 6 due to the rolling direction force acting on the lower work roll 2, the lower work roll outlet strain measuring means 11 and the lower work roll arranged on the exit side and the entry side of the lower work roll chock 6 are also shown. The elastic strain acting on the lower work roll chock 6 is calculated by the lower work roll chock elastic strain calculation device 15 based on the measured value of the entry side strain measuring means 12.

  In the meandering / camber control of (14), in the work roll chock elastic strain summation device 16, the sum of the calculation result of the upper work roll chock elastic strain calculation device 14 and the calculation result of the lower work roll chock elastic strain calculation device 15 is taken up and down. Calculate the total elastic strain value (working side) acting on the roll. The procedure as described above is performed not only on the work side but also on the drive side with exactly the same device configuration, and the result is obtained as a work roll choc elastic strain total value (drive side) 17 on the drive side. The difference between the operation result on the work side and the operation result on the drive side is calculated by the work side-drive side elastic strain sum calculation device 18, and thereby the difference between the work side and the drive side of the elastic strain acting on the work roll chock is calculated. Will be calculated.

  Next, based on the calculation result of the difference between the working side and the driving side of the elastic strain, the reduction leveling control amount computing device 19 determines the difference between the working side and the driving side of the elastic strain acting on the work roll chock as an appropriate target value. Then, a left-right asymmetric component control amount of the roll opening degree of the rolling mill for preventing camber is calculated. Here, based on the left-right difference of the elastic strain, for example, the control amount is calculated by PID calculation considering a proportional (P) gain, an integral (I) gain, and a differential (D) gain. And based on this control amount calculation result, the rolling leveling control device 20 controls the left-right asymmetric component of the roll opening of the rolling mill, so that it is possible to realize the rolling with very little camber or no camber.

  By the way, in the apparatus configuration described above, until the calculation result of the work side-drive side elastic strain summation calculation apparatus 18 is obtained, basically, the output of the total eight strain measurement means is adjusted for the work side and the drive side. Since only the calculation is performed, the above-described apparatus configuration and calculation order may be arbitrarily changed. For example, the outputs of the upper and lower output side distortion measuring means may be added first, then the difference between the input side addition results may be calculated, and finally the difference between the work side and the drive side may be calculated. The difference between the working side and the driving side of the output of the strain measurement means at each position may be calculated, then summed up and down, and finally the difference between the entry side and the exit side may be calculated.

  In the case of the warpage control of (15), in the work roll chock elastic strain summing device (working side) 16, the difference between the calculation result of the upper work roll chock elastic strain calculation device 14 and the calculation result of the lower work roll chock elastic strain calculation device 15 is taken, The difference between the upper and lower elastic strains acting on the work roll chock is calculated. In the above procedure, not only the work side but also the drive side performs the calculation with the same apparatus configuration, and the result is obtained as the work roll chock elastic strain upper / lower difference 17 on the drive side. Then, the upper side-lower side elastic strain summation calculation device 18 aggregates the calculation result on the work side and the calculation result (vertical difference) on the driving side, thereby calculating the difference between the upper side and the lower side of the elastic strain acting on the work roll chock. Will be.

Next, based on the calculation result of the difference between the upper side and the lower side of the elastic strain, the vertical roll speed control amount calculation device 19 sets the difference between the upper side and the lower side of the elastic strain acting on the work roll chock to an appropriate target value. The amount of control of the asymmetrical component of the roll speed of the rolling mill for preventing warpage is calculated. Here, based on the vertical difference of the elastic strain, for example, the control amount is calculated by PID calculation considering a proportional (P) gain, an integral (I) gain, and a differential (D) gain.
And based on this control amount calculation result, the vertical roll speed control device 20 controls the vertical asymmetric component of the roll speed of the rolling mill, thereby realizing a slight rolling with no warpage or extremely low warpage.
Here, the roll speed of the rolling mill was used as the up / down asymmetric component control amount, but the friction coefficient between the rolling roll and the material to be rolled, the temperature difference between the upper and lower surfaces of the material to be rolled, the incident angle of the material to be rolled, And the horizontal direction position etc. of a work roll chock may be used.

  By the way, in the above-described apparatus configuration, until the calculation result of the upper-lower elastic strain summation calculation apparatus 18 is obtained, basically only the addition and subtraction calculation of the outputs of the total eight strain measurement means including the upper and lower sides is performed. Therefore, the above-described device configuration and calculation order may be arbitrarily changed. For example, the outputs of the output side distortion measuring means on the working side and the driving side may be added first, then the difference between the addition results on the input side may be calculated, and finally the difference between the upper side and the lower side may be calculated. The difference between the upper side and the lower side of the output of the strain measurement means at each position may be calculated first, the work side and the driving side may be summed, and finally the difference between the entry side and the exit side may be calculated.

    In the case of the zero point adjustment of (16), the calculation result on the working side and the calculation result on the driving side are obtained by the working side-driving side elastic strain sum calculating unit 18 through the same calculation process as the meandering / camber control of (14). Thus, the difference between the working side and the driving side of the elastic strain acting on the work roll chock is calculated.

  Then, the hydraulic pressure reducing device 13 is operated simultaneously on the working side and the driving side, and is tightened until the sum of the left and right of the reinforcing roll reaction force reaches a predetermined value (zero-tone load). The leveling operation is performed to make the difference between the working side and the driving side zero.

  Subsequently, the elastic strain acting on the work roll chocks 5 and 6 in the reduction leveling control amount computing device 19 based on the calculation result 18 of the difference between the working side and the driving side (difference between the working side and the driving side) of the elastic strain described above. The control amount of the hydraulic pressure reducing device 13 is calculated so that the difference between the working side and the driving side becomes zero and the zero load is maintained. And based on this control amount calculation result, the rolling leveling control device 20 controls the rolling position of the roll of the rolling mill. Thereby, the difference between the working side and the driving side of the elastic strain acting on the work roll chock is set to zero, and the reduction position at that time is set as the zero point of the reduction position for each of the working side and the driving side. As described above, the difference between the working direction and the driving side of the rolling direction force acting on the work roll chock (upper work roll chock 5 and lower work roll chock 6) is not affected by the roll thrust force. The elastic strain is not affected, and even if a thrust force is generated between the rolls, it is possible to realize the zero point setting of the rolling leveling with extremely high accuracy.

  Even in the zero point adjustment of (16), in the above-described apparatus configuration, until the calculation result of the work side-drive side elastic strain summation calculation apparatus 18 is obtained, basically a total of eight work side and drive side are combined. Only the addition / subtraction operation of the output of the distortion measuring means is performed. Therefore, the above-described device configuration and the order of calculation may be arbitrarily changed. For example, the outputs of the upper and lower output side distortion measuring means may be added first, then the difference between the input side addition results may be calculated, and finally the difference between the work side and the drive side may be calculated. The difference between the working side and the driving side of the output of the strain measurement means at each position may be calculated, then summed up and down, and finally the difference between the entry side and the exit side may be calculated.

According to the method described in (17), the elastic strain in the rolling direction generated on the entry side and the exit side of the work roll is measured, the strain difference on the entry / exit side is calculated, and the strain difference is calculated by the rolling direction force. It is transmitted as an elastic strain of a work roll chock.
In the invention described in (17), the elastic strain of the work roll chock due to the rolling direction force is transmitted after obtaining the difference between the detected values of the strain measuring means on the entry / exit side. This requires a step of calculating the distortion difference on the input / output side before transmission, but the transmission path can be reduced. In particular, when transmitting wirelessly, the number of wireless paths can be reduced. That is, the detection value from the distortion measuring means may be transmitted as it is (without being calculated) by the two transmission / reception transmission means, or as shown in this embodiment, the difference between the input / output sides is taken and the difference is taken. May be transmitted as the elastic strain of the work roll chock due to the rolling direction force.

  According to the method described in (18), the work roll chock is pressed in the rolling direction against either the entry side or the exit side of the work roll chock in the rolling direction. By pressing the work roll chock in the rolling direction, the position of the work roll chock in the rolling direction can be stabilized, and the responsiveness and accuracy of measurement of elastic strain caused by the rolling direction force acting on the work roll chock can be improved.

  According to the method described in (19), from the opposite side of the work side roll chock and the drive side roll chock in the rolling direction on the entry side and the exit side from the side on which the work roll is offset with respect to the reinforcing roll, The work side roll chock and the drive side roll chock are pressed in the rolling direction. Since the offset component force is generated as the horizontal component force of the rolling load due to the work roll offset, the position of the work roll chock in the rolling direction can be stabilized. Furthermore, by pressing the work roll from the side opposite to the offset side, the offset force acting on the work roll from the reinforcing roll acts in the direction of pressing the work roll chock to the outlet side, so the pressing force of the work roll chock is reduced. Can be made compact and inexpensive. Moreover, since the force which pinches | interposes a work roll chock can be made small simultaneously, the disturbance factor of other control can also be restrained small.

  According to the method described in (20), the pressing means has a function of detecting a rolling direction force. Since the elastic strain of the roll chock occurs due to the rolling direction force acting on the roll chock, the means for pressing has the function of detecting the rolling direction force, so that the measured value of the elastic strain and the measured value of the rolling direction force are collated, It can be used to improve the accuracy of the measured value of elastic strain and to detect whether there is a measurement abnormality.

  In order to confirm the effect of the present invention, a rolling test was performed in the thick plate rolling apparatus shown in FIG. The work roll diameter is 1200 mm, and the reinforcing roll diameter is 2400 mm. The rated load is 80,000 kN.

Example 1
As a test method, a load cell for rolling direction force calibration (or for testing or verification) (hereinafter referred to as a load cell for rolling direction force calibration) is arranged between the roll chock and the housing, and the rolling direction is inside the roll chock according to the present invention. Rolling was performed under the condition that the plate thickness after rolling was 5 mm to 100 mm with a means for measuring strain generated by force, and the outputs of both were investigated. In this test, the work roll was offset by 20 mm in the rolling exit direction with respect to the reinforcing roll, and a rolling direction force was easily generated as an offset component force.

As a result, the load cell for calibrating the rolling direction force installed between the roll chock and the housing shows a small measured value with respect to the offset component force calculated from the rolling load when the plate thickness after rolling is 20 mm or more, and 40 mm or more. The load cell pressure receiving position and the roll chock were not in contact with each other, and the rolling direction force could not be measured.In contrast, according to the present invention, in the rolling direction force strain measuring means arranged inside the roll chock, for all plate thickness conditions, The amount of elastic strain equivalent to the offset component force was measured. FIG. 8 is a diagram schematically showing the signal intensity when the plate thickness is changed for the load cell of the comparative example and the strain measuring means of the example. As the plate thickness increases and the roll chock deviates from the optimum application range of the load cell, the signal strength decreases. Further, in order to use the load cell in a wide range, the signal strength may slightly decrease at the position where the plate thickness is zero. On the other hand, in the strain measuring means of the present invention, the signal intensity is constant regardless of the variation of the plate thickness. From this, it was found that the present invention can measure the rolling direction force with high accuracy for every roll gap.
Further, the strain measuring means is advantageous in terms of remodeling cost because the cost of the apparatus itself is generally low compared with the load cell and can be easily attached.
Furthermore, as the strain measuring means, both the one that transmits the measurement signal by wire and the one that can be transmitted wirelessly were used, but in either case, the rolling apparatus could be operated without any problem. In addition, when using wireless, there are two types of transmission: (i) transmitting distortion measurement signals as they are (without calculation) by each transmission means on the input / output side, and (ii) taking the difference on the input / output side. Therefore, it was attempted to transmit the difference as the elastic strain of the work roll chock due to the rolling direction force, but in any case, the rolling apparatus could be operated without any problem.

Example 2
Furthermore, using the rolling apparatus shown in FIG. 7, a state in which a load cell for rolling direction force calibration is arranged between the roll chock and the housing, and a means for measuring strain caused by the rolling direction force is provided inside the roll chock according to the present invention. In the rolling method in which rolling is performed with a rolling apparatus outlet side plate thickness of 15 to 100 mm on 50 plain steel plates having an inlet side plate thickness of 20 to 150 mm and a plate width of 3000 mm, the rolling direction is performed inside the roll chock according to the present invention. Each of the rolling methods in which the leveling control was performed so that the left-right difference in output of the force strain measuring means became zero was carried out.

  As a result, with regard to the meandering of the rolled material and the camber, in the rolling using the method according to the present invention, the leveling control is performed so that the left-right difference of the output becomes zero, in the strain measuring means of the rolling direction force inside the roll chock, No remarkable thing was generated during the rolling of 50 sheets. On the other hand, in rolling without leveling control according to the present invention, five cambers of about 50 mm (per 20 m) out of 50 rolled sheets were generated particularly under the condition of thick plate thickness.

As a result, the present invention enables high-precision reduction leveling control under any plate thickness conditions, and poor planar shape and dimensional accuracy such as rolled material camber and plate thickness wedge due to poor leveling setting, or meandering and drawing. It was found that the board trouble can be solved.

Example 3
Furthermore, using the rolling apparatus shown in FIG. 7, a state in which a load cell for rolling direction force calibration is arranged between the roll chock and the housing, and a means for measuring strain caused by the rolling direction force is provided inside the roll chock according to the present invention. In the rolling method in which rolling is performed with a rolling apparatus outlet side plate thickness of 15 to 100 mm on 50 plain steel plates having an inlet side plate thickness of 20 to 150 mm and a plate width of 3000 mm, the rolling direction is performed inside the roll chock according to the present invention. Each of the rolling methods for controlling the different peripheral speeds of the force strain measuring means so that the difference between the upper and lower outputs becomes zero was carried out.

As a result, regarding the warpage of the rolled material, in the rolling using the method according to the present invention, the method of controlling the peripheral speed so that the vertical difference of the output is zero, the strain measuring means of the rolling direction force inside the roll chock, No remarkable thing was generated during the rolling of 50 sheets. On the other hand, in the rolling that does not perform the roll different peripheral speed control according to the present invention, seven warpages of about 80 mm out of the number of rolled sheets were generated, especially under the condition of thick plate thickness.
As a result, it has been found that the present invention makes it possible to control warpage with high accuracy even under any plate thickness conditions, and to solve a plate passing trouble.

Example 4
Further, a kiss roll tightening test was performed in the thick plate rolling apparatus shown in FIG. The work roll diameter is 1200 mm, and the reinforcing roll diameter is 2400 mm. The rated load is 80,000 kN.

  As a testing method, a load cell for calibrating the rolling direction force is arranged between the roll chock and the housing, and the roll choc according to the present invention is provided with strain measuring means for the rolling direction force. Rolling direction force acting on the work side roll chock and the drive side roll chock of the work roll, and the kiss roll tightening is performed so that the sum of the reaction force of the reinforcing roll on the work side and the drive side becomes a predetermined value. When the reduction position where the difference between the work side and the drive side of the load cell output is within 1% of the rated load is set as the reduction zero adjustment position, the sum of the reaction forces of the reinforcing rolls on the work side and the drive side according to the present invention is Rolling is performed to tighten the kiss rolls to the specified value, and to act on the work side roll chock and the drive side roll chock of the work roll. And when the difference of the work side and drive side of the strain measuring means countercurrent force was pressure zero adjustment position pressing position is within 1% of the rated load were compared for weight variation due to the change in the cross angle.

When the cross angle is changed from −0.1 ° to + 0.1 °, there is zero reduction based on the difference between the working side and the driving side of the load cell output of the rolling direction force acting on the work chock and the driving side roll chock of the work roll. The amount of change of the leveling zero in the adjustment method was 0.03 mm, which is relatively small, whereas the working side of the strain measuring means output of the rolling direction force acting on the work side and the drive side roll chock according to the present invention. The amount of change in the leveling zero point in the reduction zero adjustment method based on the difference between the driving side and the driving side was very small, 0.015 mm or less. From this, it was found that highly accurate reduction zero adjustment is possible according to the present invention.
At the kiss roll position, in the case of a load cell, it becomes the end of the application range, so the error may slightly increase compared to the center of the application range. On the other hand, in the present invention, the detection accuracy does not change depending on the roll position, and the error does not change.

  By the way, in the present invention, elastic strain is used instead of rolling direction force in leveling control, vertical asymmetry control, and zero point adjustment. In explaining the present invention, there is a place where the rolling direction force is used, but if the measured elastic strain is used, the present invention can be carried out without necessarily converting into the rolling direction force.

1 Upper work roll 2 Lower work roll 3 Upper reinforcement roll 4 Lower reinforcement roll 5 Upper work roll chock (working side)
6 Lower work roll chock (work side)
7 Upper reinforcement roll chock (working side)
8 Lower reinforcement roll chock (working side)
9 Upper work roll outlet side strain measurement means (work side)
10 Upper work roll entry side strain measurement means (work side)
11 Lower work roll exit side strain measurement means (work side)
12 Lower work roll entry side strain measurement means (work side)
13 Reduction device 14 Upper work roll chock elastic strain calculation device (work side)
14 'Upper work roll chock elastic strain calculation device (drive side)
15 Lower work roll chock elastic strain calculation device (work side)
15 'lower work roll chock elastic strain calculation device (drive side)
16 Work roll chock elastic strain summing device [adder / subtractor] (working side)
17 Work roll chock elastic strain summing device [adder / subtracter] (drive side)
18 Elastic strain addition arithmetic unit (working side-driving side / upper side-lower side)
19 Control amount calculation device (rolling leveling control amount / vertical asymmetric component control amount)
20 Control device (rolling leveling / vertical asymmetric component)
DESCRIPTION OF SYMBOLS 21 Metal plate material 22 Rolling direction 23 Mill housing 24 Delivery side project block 25 Entrance side project block 26 Rolling load detection device 27 Pressing device 109 Upper work roll delivery side load cell (working side)
110 Upper work roll entry side load cell (work side)
111 Lower work roll exit load cell (work side)
112 Lower work roll entry side load cell (work side)
DESCRIPTION OF SYMBOLS 301 Roll chock 302 Bearing 303 Roll axis storage part 304 Strain measuring means 305 Bolt 306 Lead wire 307 Rolling direction force action position 308 Roll axis center height 309 Roll axis diameter 310 Reduction fulcrum position 311 Roll axis storage length 312 Roll chock end surface

Claims (20)

  In a rolling device having at least a pair of upper and lower work rolls and a reinforcing roll, strain measurement is performed to measure the elastic strain in the rolling direction generated on the work side roll chock and the drive side roll chock of the work roll on the entry side and the exit side of the work roll chock. A rolling device comprising means.   The rolling apparatus according to claim 1, wherein the strain measuring means is a piezo element or a strain gauge.   The rolling device according to claim 1 or 2, wherein the strain measuring means transmits a measurement signal wirelessly.   Acts on the work roll chock elastic strain calculation device that makes the difference between the elastic strain on the entry side and the exit side measured by the strain measuring means the elastic strain of the work roll chock due to the rolling direction force, and on the work side roll chock and the drive side roll chock Left and right elastic strain difference calculation device that calculates the difference between elastic strains, and a reduction leveling control amount calculation that calculates the control device control amount on the working side and the drive side of the rolling device based on the calculated values of the left and right elastic strain difference calculation device And a reduction leveling control device that controls the reduction device on the working side and the driving side of the rolling device based on the calculated value of the reduction leveling control amount calculation device. 4. The rolling apparatus according to any one of items 3.   Acting on the work roll chock elastic strain calculation device that makes the difference between the elastic strain on the entry side and the exit side measured by the strain measuring means the elastic strain of the work roll chock due to the rolling direction force, and on the upper work roll chock and the lower work roll chock A vertical elastic strain difference calculation device for calculating the difference between the elastic strains, and a vertical asymmetric component control amount calculation device for calculating the vertical asymmetric component control amount of the rolling device based on the calculated value of the vertical elastic strain difference calculation device. A vertical asymmetric component control device for controlling a vertical asymmetric component control amount of the rolling device based on a calculated value of the vertical asymmetric component control amount calculation device. The rolling apparatus of Claim 1. The strain measuring means is a rolling device which is a strain measuring means for measuring elastic strain in the rolling direction in a kiss roll state,
Furthermore, the work roll chock elastic strain calculation device that makes the difference between the elastic strains of the entry side and the exit side measured by the strain measurement means the elastic strain of the work roll chock due to rolling direction force, and the work side roll chock and the drive side roll chock A left-right elastic strain difference calculation device that calculates the difference between the elastic strains acting, and a reduction leveling control that calculates a control amount of the reduction device on the working side and the drive side of the rolling device based on the calculated values of the left-right elastic strain difference calculation device An amount calculation device, and a reduction leveling control device that controls the reduction device on the working side and the drive side of the rolling device based on the calculated value of the reduction leveling control amount calculation device,
In the reduction leveling control device, the sum of the reaction forces on the working side and the driving side in the kiss roll state is set to a value within a range of ± 2% around a predetermined value, and the roll chock on the work side of the work roll Further, the control amount of the reduction device on the working side and the driving side of the rolling device is calculated so that the difference between the left and right elastic strains acting on the driving side roll chock is within ± 5% of the average elastic strain on the working side and the driving side. The rolling apparatus according to any one of claims 1 to 3, wherein   In place of the work roll chock elastic strain calculation device, a circuit for calculating the difference between the input and output sides measured by the strain measuring means is provided, and the strain difference is transmitted as elastic strain of the work roll chock due to rolling direction force. The rolling apparatus according to any one of claims 4 to 6.   It has a pressing device for pressing the work roll chock in the rolling direction on either the rolling direction entry side or the exit side of the work roll chock, according to any one of claims 1 to 7. Rolling equipment.   Of the work side roll chock and the drive side roll chock in the rolling direction on the entry side and the exit side, the work side roll chock and the drive side roll chock in the rolling direction on the side opposite to the side where the work roll is offset with reference to the reinforcing roll A rolling device according to any one of claims 1 to 7, further comprising a pressing device for pressing the pressing device.   The rolling device according to claim 8 or 9, wherein the pressing device has a function of detecting a rolling direction force and detecting an elastic strain of the work roll chock based on the rolling direction force. In a rolling method of a metal plate material performed using a rolling device having at least a pair of upper and lower work rolls and a reinforcement roll, elastic strain in the rolling direction generated on the entry side and the exit side of the work side roll chock and the drive side roll chock of the work roll a, measured in work roll chock,
Rolling method.   The rolling method according to claim 11, wherein the strain measuring means is a piezo element or a strain gauge.   The rolling method according to claim 11 or 12, wherein the strain measuring means transmits a measurement signal wirelessly. The work side roll chock of the work roll by the rolling direction force is calculated by calculating the difference between the input and output sides based on the measured value of the elastic strain in the rolling direction generated on the entry side and the exit side of the work side roll chock and the drive side roll chock of the work roll. And the elastic strain of the drive side roll chock, and further calculate the difference between the left and right elastic strains,
Based on the calculated value of the left and right elastic strain difference, the rolling device work side and the drive side reduction device control amount is calculated,
The rolling method according to any one of claims 11 to 13, wherein a rolling device on a working side and a driving side of the rolling device is controlled based on a calculated value of a control amount of the rolling device. The upper roll chock of the work roll is calculated by calculating the difference on the entry / exit side based on the measured value of the elastic strain in the rolling direction generated on the entry side and the exit side of the upper work roll chock and the lower work roll chock of the work roll. And calculate the elastic strain of the lower roll chock, further calculate the difference between the upper and lower elastic strains,
Based on the calculated value of the vertical elastic strain difference, the vertical asymmetric component control amount of the rolling device is calculated,
The rolling method according to any one of claims 11 to 13, wherein a vertical asymmetric component control amount of the rolling apparatus is controlled based on a calculated value of the vertical asymmetric component control amount. The sum of the reaction forces on the working side and driving side in the kiss roll state is set to a value within a range of ± 2% around a predetermined value,
Measure the elastic strain in the rolling direction generated on the entry side and the exit side of the work side roll chock and the drive side roll chock in the kiss roll state,
Calculate the difference between the entry and exit sides based on the entry side and exit side elastic strain, compute the elastic strain of the work side roll chock and the drive side roll chock of the work roll due to rolling direction force,
Based on the calculated elastic strain values on the working side and the driving side, the difference between the left and right elastic strains is calculated,
The left and right reduction position of the rolling device is set so that the difference between the left and right elastic strains is within a range of ± 5% of the average elastic strain on the working side and the driving side,
The rolling method according to claim 11, wherein the set reduction position is set as an initial reduction position.   The elastic strain in the rolling direction generated on the entry side and the exit side of the work roll is measured, the difference between the entry and exit sides is calculated, and the difference in strain is transmitted as the elastic strain of the work roll chock due to the rolling direction force. The rolling method according to any one of claims 14 to 16.   The rolling method according to any one of claims 11 to 17, wherein the work roll chock is pressed in the rolling direction against either the entry side or the exit side of the work roll chock in the rolling direction.   Of the work side roll chock and the drive side roll chock in the rolling direction on the entry side and the exit side, the work side roll chock and the drive side roll chock in the rolling direction from the side opposite to the side where the work roll is offset with reference to the reinforcing roll. The rolling method according to claim 11, wherein pressing is performed.   The rolling method according to claim 18 or 19, wherein the pressing means has a function of detecting a rolling direction force and detecting an elastic strain of the work roll chock based on the rolling direction force.

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