JP5883455B2 - Roller leveler and plate material correction method using the same - Google Patents

Description

  The present invention relates to a roller leveler that corrects a metal plate such as a steel plate, and a plate material correcting method using the roller leveler.

  In the process of manufacturing a plate material such as a steel plate, rolling and cooling are performed. In these steps, the plate material is warped and deformed in a wave shape. For this reason, a roller leveler in which a plurality of leveling rolls are arranged in a staggered pattern in the vertical direction is used for the purpose of flattening the plate material by correcting such warpage and wave shape deformation.

  The roller leveler passes the plate to be corrected in a state where a plurality of upper leveling rolls are pushed into a plurality of lower leveling rolls or a state where a plurality of lower leveling rolls are pushed into a plurality of upper leveling rolls. Is repeatedly bent to flatten the warpage and wave shape of the plate material.

  When the plate material is corrected, the leveling roll is driven by the drive motor, and when the leveling roll and the plate material to be corrected come into contact, the driving force is transmitted to the plate material, and the plate material is caught between the upper and lower leveling rolls. At this time, the pressing amount of the upper leveling roll by the reduction cylinder is set so that necessary flatness can be obtained according to various conditions such as the thickness of the plate material, the material, the shape, the diameter of the leveling roll, and the roll pitch. .

  By the way, in such a roller leveler, the constituent elements of the apparatus such as the upper frame and the lower frame are subjected to correction reaction force in the width direction (this means the width direction of the frame, but the width direction of the frame is parallel to the width direction of the plate material). Therefore, both of them are the same in a broad sense) and may be bent (lateral bending). When such horizontal bending occurs, the amount of reduction in the width direction of the plate material is affected by the bending. Fluctuates and high-precision leveling cannot be performed.

  As a technology to solve such problems, a plurality of hydraulic crowning cylinders are continuously arranged along the width direction of the frame so as to be individually tightened and controllable, and the front end of the plate material to be corrected is between the upper and lower correction rolls. The amount of deflection at the center of the frame width is calculated by the pressure detector, and the required amount of tightening of the hydraulic crowning cylinder at the center of the frame width necessary to eliminate the amount of deflection is calculated. The required tightening amount of the hydraulic crowning cylinder is calculated by multiplying the required tightening amount in the center in the frame width direction by the plate width function, and tightening control of each hydraulic crowning cylinder is performed individually. A technique for correcting lateral deflection has been proposed (Patent Document 1).

  In addition, when a pushing force is applied by the cylinder, not only the lateral deflection described above, but also the compressive deformation of the crowning cylinder, roll frame, backup roll, leveling roll, etc. occurs, and the reduction amount also varies in the width direction of the plate material. Therefore, in addition to the lateral deflection, such compression deformation is obtained, the necessary tightening amount of each crowning cylinder necessary for eliminating these compression deformations is calculated, and in addition to the lateral deflection correction, the compression deformation is calculated. A technique that can reduce the difference in the amount of rolling reduction in the width direction has also been proposed (Patent Document 2).

Japanese Patent No. 3726146 Japanese Patent No. 3443036

  However, the techniques of Patent Documents 1 and 2 are based on a line center standard for correcting the leveling of a plate by positioning the center of the plate to be corrected at the center of the line. Thus, when such a roller leveler is arranged in a line for conveying a plate material on the basis of the plate edge, it is necessary to center the plate material by a centering device before passing through the roller leveler, which is complicated. Further, with such a line center reference device, it is difficult to perform leveling correction with high accuracy when the plate meanders or the plate is displaced due to conveyance.

  The present invention has been made in view of such a situation, and a roller leveler capable of correcting a plate material with high accuracy even when the center in the width direction of a metal plate such as a steel plate is displaced from the center of the line, and a roller leveler therefor It is an object of the present invention to provide a method for correcting a plate material using a sheet.

  In order to solve the above-described problem, a first aspect of the present invention is a roller leveler that arranges the plate material at an arbitrary position in the width direction of the plate-passing line of the plate material and corrects the leveling of the plate material, the housing, A plurality of leveling rolls arranged in a staggered manner above and below the plate passing line and rotating so as to pass the plate member while correcting the plate member, and a plurality of backup rolls for backing up the plurality of leveling rollers up and down A pair of roll frames that support the leveling roll and the backup roll above and below, and that are supported by the housing, a pair of frames that support the pair of roll frames above and below, and an entrance end of the plate member Working frame which is one of the pair of frames, provided at both ends in the width direction at each of the first and second ends A pressing cylinder that presses against the plate line and presses the plate material between the leveling rolls through a corresponding one of the roll frames, a drive device that rotates the leveling roll, the operating frame, and the roll A plurality of hydraulic crowning cylinders mounted along the width direction orthogonal to the plate passing direction of the plate material between the corresponding one of the frames, and the operation provided at a position corresponding to the hydraulic crowning cylinder; A plurality of deflection detection sensors for detecting the deflection of the frame, an offset amount detection means for detecting an offset amount from the center of the sheet passing line center of the plate width of the plate material, and a load measurement for measuring a load applied to the pressing cylinder Means and a control device for controlling leveling correction of the plate material, the control device is the off-state. The correction ratio of each end in the width direction is calculated from the offset amount from the center of the plate line at the center of the plate width of the plate material detected by the pad amount detection means and the load applied to the pressing cylinders at both ends in the width direction. Then, on the entry side and the exit side, the amount of tightening in the pressing cylinders at both ends in the width direction is individually controlled to perform vertical deflection correction in the vertical direction of the housing, and the detection values of the plurality of deflection detection sensors are obtained. Based on the offset amount detected by the offset amount detecting means by individually controlling the amount of tightening of the plurality of hydraulic crowning cylinders to correct lateral deflection in the width direction of the pair of frames. Find the center, calculate the amount of compressive deformation at the center of the plate thickness based on the load at the center of the plate width and the mill constant of the compressive deformation, In the position, the amount of compression deformation at the center of the plate thickness is multiplied by a function of a plate width and an offset amount to individually control the tightening amounts of the plurality of hydraulic crowning cylinders, and the pressing cylinder, the hydraulic crowning The compression deformation correction of the cylinder, the pair of roll frames, the backup roll, and the leveling roll is performed, and the correction amount is controlled through the leveling roll with the pressing amount necessary for correcting the plate material by the pressing cylinder. Provided is a roller leveler which is controlled to press a plate material.

  A second aspect of the present invention is a roller leveler that arranges the plate material at an arbitrary position in the width direction of the plate-passing line of the plate material and corrects the leveling of the plate material, and includes a housing and a zigzag above and below the plate-passing line. A plurality of leveling rolls that are arranged in a shape and rotate so as to pass the plate material while correcting the plate material, a plurality of backup rolls that back up the plurality of leveling rolls up and down, the leveling roll, and the A backup roll is supported at the upper and lower sides, a pair of roll frames supported by the housing, a pair of frames that support the pair of roll frames at the upper and lower sides, and an entrance end and an exit end of the plate member It is provided at both end portions in the width direction, and the operation frame which is one of the pair of frames is directed toward the through plate line. A pressure cylinder that presses the plate material between the leveling rolls via a corresponding one of the roll frames, a driving device that rotates the leveling roll, and the corresponding one of the operating frame and the corresponding one of the roll frames. A plurality of hydraulic crowning cylinders mounted along a width direction perpendicular to the plate passing direction of the plate material, and a plurality of hydraulic crowning cylinders provided at positions corresponding to the hydraulic crowning cylinders to detect bending of the operating frame. Deflection detection sensor, offset amount detection means for detecting an offset amount from the center of the plate line at the center of the plate width of the plate material, load measurement means for measuring a load applied to the pressing cylinder, and leveling correction of the plate material A control device that controls the offset amount detection means. The correction ratios of the respective ends in the width direction are calculated from the offset amount from the center of the sheet passing line at the center of the plate width of the plate material and the load applied to the pressing cylinders at both ends in the width direction. , The amount of tightening in the pressing cylinders at both ends in the width direction is individually controlled to correct vertical deflection in the vertical direction of the housing, and the plurality of hydraulic types based on detection values of the plurality of deflection detection sensors The amount of tightening of the crowning cylinder is individually controlled to correct lateral deflection in the width direction of the pair of frames, and while performing the correction control, the pressing cylinder uses the pressing amount necessary for correcting the plate material. Provided is a roller leveler which is controlled so as to press the plate material through a leveling roll.

  A third aspect of the present invention is a method of correcting the leveling of the plate material by arranging the plate material at an arbitrary position in the width direction of the plate passing line of the plate material using a roller leveler, the roller leveler comprising a housing, A plurality of leveling rolls that are arranged in a zigzag pattern above and below the threading line and rotate so as to pass the plate material while correcting the plate material, and a plurality of backups that back up the plurality of leveling rolls up and down A roll, a pair of roll frames that support the leveling roll and the backup roll above and below, supported by the housing, a pair of frames that support the pair of roll frames above and below, and an entrance side of the plate member An operation that is provided at both end portions in the width direction at the end portion and the exit end portion and is one of the pair of frames. A pressing cylinder that presses the plate toward the plate line and presses the plate material between the leveling rolls via a corresponding one of the roll frames, a drive device that rotates the leveling roll, and the operating frame; Between the corresponding one of the roll frames, a plurality of hydraulic crowning cylinders attached along the width direction perpendicular to the plate passing direction of the plate material, and provided at a position corresponding to the hydraulic crowning cylinder, A plurality of deflection detection sensors for detecting the deflection of the operating frame, an offset amount detection means for detecting an offset amount from the center of the plate line at the center of the plate width of the plate material, and a load applied to the pressing cylinder are measured. Load measuring means, and the method includes a plate of the plate material detected by the offset amount detecting means. The correction ratios of the respective ends in the width direction are calculated from the offset amount from the center of the through plate line in the center and the load applied to the pressing cylinders at both ends in the width direction. The amount of tightening of the plurality of hydraulic crowning cylinders is controlled by individually controlling the amount of tightening in the pressing cylinder, performing vertical deflection correction in the vertical direction of the housing, and based on the detection values of the plurality of deflection detecting sensors. Are individually controlled to correct lateral deflection in the width direction of the pair of frames, obtain the center of the plate width from the offset amount detected by the offset amount detecting means, and load and compressive deformation at the center of the plate width. The amount of compressive deformation at the center of the plate thickness is calculated based on the mill constant of By individually multiplying a plurality of hydraulic crowning cylinders by multiplying a function of width and offset amount, the pressing cylinder, the hydraulic crowning cylinder, the pair of roll frames, the backup roll, While correcting the compression deformation of the leveling roll and performing these correction controls, the plate material is pressed through the leveling roll with the pressing amount necessary for correcting the plate material by the pressing cylinder to level the plate material. Provided is a method for correcting a characteristic plate material.

  A fourth aspect of the present invention is a method of correcting the leveling of the plate by arranging the plate at an arbitrary position in the width direction of the plate passing line of the plate using a roller leveler, and the roller leveler includes a housing, A plurality of leveling rolls that are arranged in a zigzag pattern above and below the threading line and rotate so as to pass the plate material while correcting the plate material, and a plurality of backups that back up the plurality of leveling rolls up and down A roll, a pair of roll frames that support the leveling roll and the backup roll above and below, supported by the housing, a pair of frames that support the pair of roll frames above and below, and an entrance side of the plate member An operation that is provided at both end portions in the width direction at the end portion and the exit end portion and is one of the pair of frames. A pressing cylinder that presses the plate toward the plate line and presses the plate material between the leveling rolls via a corresponding one of the roll frames, a drive device that rotates the leveling roll, and the operating frame; Between the corresponding one of the roll frames, a plurality of hydraulic crowning cylinders attached along the width direction perpendicular to the plate passing direction of the plate material, and provided at a position corresponding to the hydraulic crowning cylinder, A plurality of deflection detection sensors for detecting the deflection of the operating frame, an offset amount detection means for detecting an offset amount from the center of the plate line at the center of the plate width of the plate material, and a load applied to the pressing cylinder are measured. Load measuring means, and the method includes a plate of the plate material detected by the offset amount detecting means. The correction ratios of the respective ends in the width direction are calculated from the offset amount from the center of the through plate line in the center and the load applied to the pressing cylinders at both ends in the width direction. The amount of tightening of the plurality of hydraulic crowning cylinders is controlled by individually controlling the amount of tightening in the pressing cylinder, performing vertical deflection correction in the vertical direction of the housing, and based on the detection values of the plurality of deflection detecting sensors. Are individually controlled to perform lateral deflection correction in the width direction of the pair of frames, and while performing these correction controls, the pressing cylinder is used to press the leveling roll with a pressing amount necessary for correcting the plate material. Provided is a method for correcting a plate material, wherein the plate material is pressed to level the plate material.

It is a side view which shows the roller leveler which concerns on one Embodiment of this invention. It is a top view which shows the roller leveler which concerns on one Embodiment of this invention. It is sectional drawing for demonstrating the structure of a hydraulic type crowning cylinder. It is a control block diagram of crowning control by a hydraulic crowning cylinder. It is a schematic diagram for demonstrating the vertical deflection correction control in this embodiment. It is a schematic diagram for demonstrating the lateral deflection correction control in this embodiment. It is a schematic diagram for demonstrating the compression deformation correction control in this embodiment. It is a figure which shows the relationship between the plate width direction position and roll gap when the amount of offset of the width direction of a steel plate is changed and the leveling correction of a steel plate is performed by the conventional control method. It is a figure which shows the relationship between the offset amount of the sheet width direction of a steel plate, and the roll gap deviation of a sheet width direction when changing the offset amount of the width direction of a steel plate, and performing leveling correction of the steel plate by the conventional control method. . Sheet width direction position and roll when leveling correction is performed by controlling in mode 1 (conventional), mode 2A (present invention), and mode 2B (present invention) when the offset amount in the width direction of the steel sheet is 375 mm It is a figure which shows the relationship with a gap. The amount of offset in the plate width direction when the leveling correction is performed by changing the offset amount in the width direction of the steel plate and controlling in mode 1 (conventional), mode 2A (invention), and mode 2B (invention). It is a figure which shows the relationship between the roll gap deviation of a board width direction.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side view showing a roller leveler according to an embodiment of the present invention, and FIG. 2 is a front view thereof. The roller leveler 100 according to the present embodiment includes a housing 1, an upper frame 2 provided inside the housing 1, and a lower frame 3 provided so as to support the housing 1. An upper roll frame 5 is suspended below the upper frame 2 by an upper roll grip cylinder (not shown). On the other hand, a lower roll frame 10 is installed on the lower frame 3. As will be described later, the upper frame 2 moves up and down by being pressed by a pressing cylinder (also referred to as a reduction cylinder), and therefore can be called an operation frame. The operation frame is not limited to the upper frame 2, and the lower frame 3 may be configured as an operation frame and moved up and down by being pushed by a pressing cylinder provided below the operation frame.

  Between the upper roll frame 5 and the lower roll frame 10, a plurality of upper leveling arranged in a zigzag manner vertically so as to form a path (passage plate) line of the plate material P which is a metal plate such as a steel plate. A leveling roll unit 20 having a roll 6 and a plurality of lower leveling rolls 8 is provided. In the leveling roll unit 20, the upper leveling roll 6 is supported by the upper roll frame 5 below the upper roll frame 5, and the lower leveling roll 8 is supported by the lower roll frame 10 on the lower roll frame 10. Guide rolls 14 for guiding the plate material P are provided on the upstream side and the downstream side in the conveying direction of the plate material P of the leveling roll unit 20. The upper leveling roll 6 and the lower leveling roll 8 are rotated by a driving device 15 and can correct the plate material P by moving it in the direction of the arrow in FIG. The moving direction may be opposite to the arrow.

  A plurality of short upper backup rolls 7 for backing up the upper leveling roll 6 are arranged on the upper leveling roll 6 so as to be supported by the upper roll frame 5 along the axial direction of the upper leveling roll 6. A plurality of short lower backup rolls 9 for backing up the lower leveling rolls 8 are arranged below the lower leveling rolls 8 so as to be supported by the lower roll frame 10 along the axial direction of the lower leveling rolls 8. .

A reduction cylinder (also referred to as a pressing cylinder) that applies a pressing force (also referred to as pressing force) for correcting the plate material P to both ends of the leveling roll unit 20 between the housing 1 and the upper frame 2 in the conveying direction of the plate material P. 4a and 4b are arranged. Two rolling-down cylinders 4a and 4b are provided on both ends (drive side and workpiece side) in the width direction of the plate material P (see FIG. 2, but only the rolling-down cylinder 4a is shown in FIG. 2).
In the present specification, the term “reducing” is intended to encompass not only the case where pressure is applied downward as shown in FIG. 1, but also the case where pressure is applied upward as described later as a modified example. To do. In other words, in this specification, the term “pressing” can be replaced with the term “pressing”.

  The reduction cylinders 4a and 4b press down the plate material P via the upper roll frame 5, the upper backup roll 7 and the upper leveling roll 6 with respect to the lower leveling roll 8 fixedly provided on the lower roll frame 10. It has become.

  Each of the upper leveling roll 6 and the lower leveling roll 8 is provided with a driving device 15 having a rotary motor individually or in plural (only one is shown in FIG. 1 for convenience), and the upper leveling roll 6 and the lower leveling roll 8 is rotated by a driving device 15. Then, the plate material P is passed between the upper leveling roll 6 and the lower leveling roll 8 by the driving device 15, and the plate material P is leveled down by the reduction cylinders 4 a and 4 b via the upper leveling roll 6. It comes to correct.

  When the plate material P is conveyed in the direction of the arrow in FIG. 1, the reduction cylinder 4a functions as an entry-side reduction cylinder, and the reduction cylinder 4b functions as an exit-side reduction cylinder. When the plate material P is conveyed in the direction opposite to the arrow, the reduction cylinder 4b functions as an inlet-side reduction cylinder, and the reduction cylinder 4a functions as an outlet-side reduction cylinder. The upper leveling roll 6 may be fixedly provided, and the lower leveling roll 8 may be reduced by a reduction cylinder.

  A plurality (seven in this embodiment) of hydraulic crowning cylinders 12 are connected between the upper frame 2 and the upper roll frame 5 in the plate width direction. As shown in FIG. 2, each crowning cylinder 12 is installed at an equal pitch so as to correspond to the leveling rolls 6 and 8 along the width direction orthogonal to the plate passing direction of the plate material P. The hydraulic crowning cylinders 12 are installed in two rows as shown in FIG. The number of rows of crowning cylinders may be three or more.

  As shown in FIG. 3, the hydraulic crowning cylinder 12 has a cylinder body 31 and a piston 32, and the upper end of the piston 32 is connected to the upper frame 2 via a spherical joint member 33, and the bottom of the cylinder body 31 is The upper roll frame 5 is connected via a slide joint 34. This hydraulic crowning cylinder 12 has a built-in position detection sensor 35. The hydraulic crowning cylinder 12 expands and contracts due to hydraulic pressure, and an oil supply line 36 that supplies oil to an extension-side oil chamber (not shown) for extension operation, and a release line 37 that releases hydraulic pressure, Is connected. The oil feed line 36 is connected to a pressure detector 38 for detecting the oil pressure in the extension side oil chamber and a control valve 39 for controlling the oil feed amount. As the control valve 39, a servo valve or a proportional control valve is used.

  As shown in FIG. 2, a deflection detection sensor 21 that detects lateral deflection of the upper frame 2 is provided above the upper frame 2 at a position corresponding to each hydraulic crowning cylinder 12. In the present embodiment, a total of 14 deflection detection sensors 21 are provided corresponding to each hydraulic crowning cylinder 12. The deflection detection sensor 21 always detects the distance to the lower end of the upper frame 2 and calculates the deflection amount of the upper frame 2 based on this distance. Further, in the inner space of the lower frame 3, a deflection detection sensor 22 that detects lateral deflection of the lower frame 3 is provided at a position corresponding to each hydraulic crowning cylinder 12. In the present embodiment, a total of 14 deflection detection sensors 22 corresponding to the hydraulic crowning cylinder 12 are also provided. The deflection detection sensor 22 always detects the distance to the upper end of the lower frame 3 and calculates the deflection amount of the lower frame 3 based on this distance.

  Note that the number of the deflection detection sensors 21 is not limited to 14 and varies depending on the number of hydraulic crowning cylinders 12. For example, if the number of crowning cylinders is 6 in 2 rows, then 12 is 5; Alternatively, a deflection detection sensor may be provided in only one of the upper frame 2 and the lower frame 3, and the deflection amount of the other frame may be obtained by proportional calculation.

  A load cell (or a hydraulic pressure converter) 23 is attached between the reduction cylinders 4a and 4b and the housing 1 as a load measuring means for measuring the load applied to the reduction cylinders 4a and 4b. The compression deformation of the hydraulic crowning cylinder 12, the upper roll frame 5, the upper backup roll 7, the upper leveling roll 6, the lower leveling roll 8, the lower backup roll 9, and the lower roll frame 10 can be detected.

  Further, as shown in FIG. 1, a scanning laser sensor 25 is provided on the entrance side of the plate material P (in this example, the reduction cylinder 4a side) as a means for measuring the edge position of the plate material P above the plate material P. It has been. As shown in FIG. 2, the scanning laser sensor 25 detects the edge position in the width direction of the plate material P by scanning the laser to be irradiated. In the present embodiment, the plate material P is not centered, and the plate material P is transported so that the center of the plate material P is offset from the center of the transport line, for example, as a plate edge reference. Is used to detect the edge position in the width direction of the plate P. Note that the means for measuring the edge position of the plate material P is not limited to the scanning laser sensor 25.

In the roller leveler 100 of this embodiment, each component is controlled by the control device 50. The control device 50 includes a process controller including a CPU, a user interface including a keyboard and a display, and a recipe storing a control program (software) and processing condition data. Part. In response to an instruction from the user interface, an arbitrary recipe is called from the storage unit and executed in the process controller. Thereby, under the control of the process controller, a desired process (operation sequence) described later is performed by the roller leveler 100. Recipes such as control programs and processing condition data are stored in computer-readable storage media such as magnetic disks (flexible disks, hard disks, etc.), optical disks (CDs, DVDs, etc.), magneto optical disks (MOs, etc.), semiconductor memories, etc. It is possible to use the one that has been made. Alternatively, the recipe can be transmitted online from another device at any time, for example, via a dedicated line.
The control device 50 controls the amount of reduction of the leveling rolls 6 and 8 by the reduction cylinders 4a and 4b for correcting (leveling) the plate material P, as will be described later, according to a control program stored in a computer-readable storage medium. The drive device 15 is controlled. Further, information from the deflection detection sensors 21 and 22 and information from the load cell 23 are input to the control device 50, and the vertical deflection correction of the frame and hydraulic crowning by controlling the reduction cylinders 4a and 4b based on these information. The lateral deflection correction and the compression correction of the frame by the narrowing control of the cylinder 12 are performed.

  FIG. 4 shows a control block diagram of crowning control by the hydraulic crowning cylinder 12. Each of the control devices 50 includes a host controller 52 and a crowning controller 54 each formed of a microprocessor. The host controller 52 controls the entire roller leveler 100, and the crowning controller 54 controls the operation of the hydraulic crowning cylinder 12 based on a command from the host controller 52.

  The detection values of the deflection detection sensors 21 and 22, the load cell 23, the position detection sensor 35, and the pressure detector 38 described above are input to the crowning controller 54. The crowning controller 54 constantly grasps the lateral deflection amount of the upper frame 2 and the lower frame 3 from the detection values of the deflection detection sensors 21 and 22 respectively, and each hydraulic crowning cylinder 12 necessary for correcting the lateral deflection of the frame. The extension amount, that is, the tightening amount is calculated. The crowning controller 54 also compresses the compression deformation of the reduction cylinder 4, the hydraulic crowning cylinder 12, the upper roll frame 5, the upper backup roll 7, the upper leveling roll 6, the lower leveling roll 8, the lower backup roll 9, and the lower roll frame 10. The amount of extension of each hydraulic crowning cylinder 12, that is, the amount of tightening required for correcting the compressive deformation of the load cell 23 between the cylinders 4 a and 4 b and the housing 1 is calculated at all times. Then, the crowning controller 54 sums up these tightening amounts, calculates an output signal so as to send the pressure oil corresponding to the sum to the respective hydraulic crowning cylinders 12, and outputs the output signal to the control valve 39. The hydraulic crowning cylinders 12 are controlled by feedback so that the lateral deflection and compression deformation are minimized.

  Next, the operation | movement at the time of correcting the board | plate material P with the roller leveler 100 comprised in this way is demonstrated.

  First, the plate material P is conveyed toward the leveling roll unit 20 while being guided by the guide roll 14 from the upstream side of the leveling roll unit 20 of the roller leveler 100, and is inserted between the upper leveling roll 6 and the lower leveling roll 8. . For example, when the conveyance direction of the plate material P is an arrow direction in the drawing, the plate material P is conveyed to the leveling unit 20 from the right side of FIG. 1, and the reduction cylinder 4a is the entry side reduction cylinder.

  At this time, in accordance with the thickness of the plate material P and the like, the pressing amount (the pressing amount) of the reduction cylinders 4a and 4b necessary for leveling (correcting) the plate material P is set in the control device 50, and the set pressing amount The plate material P is corrected with (the amount of reduction).

  When leveling correction of the plate material P is performed, vertical deflection occurs in the housing 1 due to the correction reaction force, and horizontal deflection occurs in the upper and lower frames 2, 3, and the reduction cylinder 4, the hydraulic crowning cylinder 12, the upper roll frame 5, Compression deformation occurs in the backup roll 7, the upper leveling roll 6, the lower leveling roll 8, the lower backup roll 9, and the lower roll frame 10.

  In the conventional roller leveler, the center of the plate material to be corrected is positioned at the center of the line, and the leveling correction of the plate material is performed on the basis of the line center, and the correction amount such as bending is symmetric in the width direction. However, the plate material conveyance line often conveys the plate material on the basis of the plate edge, and when the roller leveler is arranged in the line for conveying the plate material on the basis of the plate edge, the plate material is moved by the centering device before passing through the roller leveler. Need to be centered. Further, with such a line center reference device, it is difficult to perform leveling correction with high accuracy when the plate meanders or the plate is displaced due to conveyance.

  Therefore, in this embodiment, even when the center of the plate material is offset from the line center, asymmetric leveling is performed to control the frame deflection and the like with high accuracy.

  In the asymmetric leveling of the present embodiment, the correction of the deflection of the frame and the compression deformation is performed in consideration of the offset from the line center of the plate material P. Specifically, at the time of leveling correction, (1) longitudinal deflection correction control, (2) lateral deflection correction control, and (3) compression deformation correction control are performed in consideration of the offset amount.

<(1) Longitudinal deflection correction control>
In the roller leveler, a vertical reaction (longitudinal deflection) is generated in the housing 1 due to the correction reaction force. Therefore, it is necessary to correct such vertical deflection. Conventionally, the leveling is performed symmetrically with the center of the plate positioned at the center of the line. Therefore, in the vertical deflection correction control, the inlet side correction reaction force Fe and the outlet side correction reaction force are applied to the inlet side reduction cylinder and the outlet side reduction cylinder. Each of Fd uses the sum load on the workpiece side (WS) and drive side (DS), and these inlet side correction reaction force Fe and outlet side correction reaction force Fd, and the mill constant of the housing: K1 and the inlet side pressure reduction cylinder Mill constants and mill constants of the output side reduction cylinder: K2 and constants based on the mechanical dimensions are used to calculate the longitudinal deflection on the input side and the output side, and the tightening amounts of the input side reduction cylinder 4a and the output side reduction cylinder 4b (Position) was controlled. Therefore, the same longitudinal deflection value was used on the work side (WS) and the drive side (DS) in the plate width direction on both the entry side and the exit side.

On the other hand, in the present embodiment, as shown in FIG. 5, the plate material P is offset in the width direction from the line center. Therefore, first, the end of the plate material P is detected by the scanning laser sensor 25 to perform the offset. to calculate the amount alpha, and a load F _D of the load F _W and the drive side of the offset alpha and working side (WS) (DS), to calculate the correction ratio of the working side (WS) and drive side (DS) . For example, when the workpiece-side vertical deflection amount is δ _W and the drive-side vertical deflection amount is δ _D , it can be expressed as follows.
δ _W = (F _W + F _D ) f (α) / K
δ _D = (F _W + F _D ) (1−f (α)) / K
However, f (α) is a function of the offset amount α, K is a mill constant of the reduction cylinder, and the work piece so that the values of δ _W and δ _D become 0 in both the input side reduction cylinder 4a and the output side reduction cylinder 4b. The tightening amounts (positions) of the side (WS) reduction cylinders 4a _W and 4b _W and the drive side (DS) reduction cylinders 4a _D and 4b _D are controlled asymmetrically.

<(2) Lateral deflection correction control>
In the roller leveler, the upper and lower frames 2 and 3 are deflected in the width direction (lateral deflection) due to the correction reaction force, and it is necessary to correct such lateral deflection. Conventionally, it was symmetrical leveling with the center of the plate positioned at the center of the line, so in lateral deflection correction control, the deflection amount at each position in the width direction is calculated based on the detection value of the deflection detection sensor provided at the center in the width direction. Then, it is used as the lateral deflection correction value at each position, and the tightening amount of each hydraulic crowning cylinder 12 is calculated based on the correction value.

  On the other hand, in this embodiment, since the plate material P is offset in the width direction from the line center, the lateral deflection is not symmetric with respect to the line center. Therefore, in the present embodiment, the deflection detection sensor 21 and the deflection detection sensor 22 are provided above and below the positions corresponding to the hydraulic crowning cylinders 12 provided in the width direction on the entry side and the exit side (seven in this example). The detected values of the deflection detection sensors 21 and 22 are used as the correction values at the respective positions, and the tightening amount of each hydraulic crowning cylinder 12 is calculated based on the detected values to perform lateral deflection correction control.

Specifically, as shown in FIG. 6, the position of the hydraulic crowning 12 is (1) to (7) from the left side, and the amount of lateral deflection of the upper frame 2 by the deflection detection sensor 21 at the corresponding position is δu (1), δu (2), δu (3), δu (4), δu (5), δu (6), δu (7), and the amount of lateral deflection of the lower frame 3 by the deflection detection sensor 22, Assuming that δl (1), δl (2), δl (3), δl (4), δl (5), δl (6), and δl (7), the total deflection amount δ ( 1) to δ (7) are the sum of these values. Therefore, the total deflection amount of the upper and lower frames at each position on the entry side is δe ₁ (1) to δe ₁ (7), and the total deflection amount of the upper and lower frames at each position on the exit side is δd ₁ (1) to Assuming δd ₁ (7), these can be calculated as follows.
δe ₁ (1) = δeu (1) + δel (1)
δe ₁ (2) = δeu (2) + δel (2)
δe ₁ (3) = δeu (3) + δel (3)
δe ₁ (4) = δeu (4) + δel (4)
δe ₁ (5) = δeu (5) + δel (5)
δe ₁ (6) = δeu (6) + δel (6)
δe ₁ (7) = δeu (7) + δel (7)
δd ₁ (1) = δdu (1) + δdl (1)
δd ₁ (2) = δdu (2) + δdl (2)
δd ₁ (3) = δdu (3) + δdl (3)
δd ₁ (4) = δdu (4) + δdl (4)
δd ₁ (5) = δdu (5) + δdl (5)
δd ₁ (6) = δdu (6) + δdl (6)
δd ₁ (7) = δdu (7) + δdl (7)

  Therefore, lateral deflection correction control can be performed by individually controlling the tightening amount of each hydraulic crowning cylinder 12 so that these values become zero.

<(3) Compression deformation correction control>
In the roller leveler, a compressive deformation occurs in the hydraulic crowning cylinder 12, the upper roll frame 5, the upper backup roll 7, the upper leveling roll 6, the lower leveling roll 8, the lower backup roll 9, and the lower roll frame 10 due to the correction reaction force. It is necessary to correct such compression deformation. Conventionally, since the center of the plate was symmetrical leveling, the load on the inlet and outlet cylinders was detected by the load cell, and the reaction force on the inlet and outlet sides of the hydraulic crowning cylinder was detected. And calculate the mill constants of the compression deformation on the inlet side and the outlet side from the calculated values, calculate the amount of compression deformation at the center of the plate width, that is, the correction amount from these values, The correction value is calculated, and the tightening amount of each hydraulic crowning cylinder is calculated based on the correction value.

On the other hand, in this embodiment, since the plate material P is offset in the width direction from the line center, the compressive deformation is not symmetric with respect to the line center. Therefore, in the present embodiment, first, the edge of the plate material P is detected by the scanning laser sensor 25 to obtain the offset amount, thereby obtaining the center of the plate width as shown in FIG. seeking load thickness center from the load F _D and the offset amount of the load F _W and the drive side of the working side (WS) (DS), also the mill modulus of compressive deformation is a function of the offset amount and the plate width and the load Obtain the amount of compressive deformation at the center of the plate thickness. Then, at the positions (1) to (7) of each hydraulic crowning cylinder 12, the position of each hydraulic crowning cylinder 12 is obtained by multiplying the calculated amount of compressive deformation at the center of the plate thickness by a function of the plate width and the offset amount. The amount of compressive deformation in (1) to (7) can be obtained.

Specifically, the load at the center of the plate width on the entry side is Fce, the mill constant of compression deformation on the entry side is Ke, and the function of the plate width and the offset amount at the position of each hydraulic crowning cylinder 12 on the entry side is a1. To a7, the compression deformation δe ₂ c at the center of the plate width on the entry side and the compression deformations δe ₂ (1) to δe ₂ (7) at the positions of the respective hydraulic crowning cylinders 12 on the entry side are as follows. Can be calculated.
δe ₂ c = Fce / Ke
δe ₂ (1) = a1 · δe ₂ c
δe ₂ (2) = a2 · δe ₂ c
δe ₂ (3) = a3 · δe ₂ c
δe ₂ (4) = a4 · δe ₂ c
δe ₂ (5) = a5 · δe ₂ c
δe ₂ (6) = a6 · δe ₂ c
δe ₂ (7) = a7 · δe ₂ c

The load at the center of the plate width on the outlet side is Fcd, the mill constant of the compression deformation on the outlet side is Kd, and the functions of the plate width and the offset amount at the position of each hydraulic crowning cylinder 12 on the outlet side are b1 to b7. Then, the compression deformation δd ₂ c at the center of the outlet side plate width and the compression deformations δd ₂ (1) to δd ₂ (7) at the positions of the outlet hydraulic crowning cylinders 12 are calculated as follows. Can do.
δd ₂ c = Fcd / Kd
δd ₂ (1) = b1 · δd ₂ c
δd ₂ (2) = b2 · δd ₂ c
δd ₂ (3) = b3 · δd ₂ c
δd ₂ (4) = b4 · δd ₂ c
δd ₂ (5) = b5 · δd ₂ c
δd ₂ (6) = b6 · δd ₂ c
δd ₂ (7) = b7 · δd ₂ c

  Therefore, the compression deformation correction control can be performed by individually controlling the tightening amount of each hydraulic crowning cylinder 12 so that these values become zero.

Above, such as, pressure cylinders _4a W from the offset amount of the plate material by calculating the correction ratio of the WS and _DS, 4b _W, 4a D, tightening of 4b _D (position) vertical deflection correction control by controlling the, Lateral deflection correction control by controlling the tightening amount of the hydraulic crowning cylinder 12 based on the deflection amount of the deflection detection sensors 21 and 22 provided corresponding to the hydraulic crowning cylinder 12, and compression deformation at the center of the plate width By multiplying the amount by a function of the plate width and the offset amount, the compression deformation correction control by controlling the tightening amount of the hydraulic crowning cylinder 12 based on the compression deformation amount at the position of each hydraulic crowning cylinder 12 is performed. Leveling the plate material that is offset from the center of the line with high accuracy by always carrying out from the biting of P Can be corrected.

  In the above-described embodiment, the vertical deflection correction control, the lateral deflection correction control, and the compression deformation correction control are controlled in consideration of the offset of the plate material. However, the offset of the plate material is considered only for the vertical deflection correction control and the lateral deflection correction control. Control may be performed.

  In the above embodiment, the case where the upper leveling roll is pressed down (pressed downward) toward the sheet passing line with the reduction cylinder to correct the shape of the plate material is shown. However, the lower leveling roll is moved through the sheet passing line with the reduction cylinder. You may make it correct | amend the shape of a board | plate material by pressing down (pressing upward) toward.

<Experimental example>
Next, experimental examples in which the effect of the present invention has been confirmed will be described.
Here, using a steel plate having a width of 1950 mm, a length of 6500 mm, a thickness of 40 mm and a yield strength YP of 356 MPa, leveling correction is performed by changing the offset amount in the plate width direction of the steel plate, and the roll in the plate width direction being corrected The gap deviation was measured.

  First, the offset amount in the width direction of the steel sheet is set to 0 mm, 188 mm, and 375 mm, and the vertical deflection, the lateral deflection, and the compression deformation are corrected and controlled by the same symmetrical control as in the conventional case (level 1). The roll gap at each position in the plate width direction on the exit side was determined. The result is shown in FIG. 8, and the roll gap deviation in the plate width direction during correction with respect to the offset amount in the plate width direction of the steel plate is shown in FIG. As shown in these figures, in the conventional symmetric control, when the offset amount is 0, the roll gap deviation in the sheet width direction is small, and a guaranteed value of 0.6 mm or less can be secured. When offset in the width direction, it was confirmed that the roll gap deviation in the plate width direction was large and exceeded the guaranteed value of 0.6 mm.

  Next, when the same steel plate is subjected to level offset correction by changing the offset amount in the plate width direction of the steel plate in the same manner and correcting the longitudinal deflection and lateral deflection by the asymmetric control of the present invention (mode 2A), and When the leveling correction was performed by correcting and controlling the vertical deflection, the lateral deflection, and the compressive deformation by the asymmetric control of the present invention (mode 2B), the roll gap deviation in the plate width direction during correction was obtained. The roll gap at each position in the plate width direction of mode 1, mode 2A, and mode 2B when the offset amount is 375 mm is shown in FIG. 10, and the plate relative to the offset amount in the plate width direction of the steel plate in mode 1, mode 2A, and mode 2B The roll gap deviation in the width direction is shown in FIG. As shown in these figures, in mode 1 which is the conventional symmetrical control, when the offset amount is 375 mm, the roll gap deviation in the plate width direction is as large as 1.55 mm, while in mode 2A which is the asymmetric control of the present invention, In mode 2B, the deviation was less than the guaranteed value of 0.6 mm. In particular, in the mode 2B in which all of the vertical deflection correction control, the lateral deflection correction control, and the compression deformation correction control are asymmetrically controlled, the deviation is 0.4 mm or less even when the offset amount is 375 mm, and a particularly good value is obtained. .

  According to the embodiment of the present invention, in consideration of the offset amount from the line center at the center in the width direction of the plate member, the vertical deflection correction of the housing and the horizontal deflection correction of the frame, or in addition to these, the reduction cylinder, the hydraulic crowning cylinder Since the compression deformation correction of the pair of roll frames, the backup roll, and the leveling roll is performed, the plate material can be corrected with high accuracy even if the width direction center of the plate material is deviated from the line center.

1; Housing 2; Upper frame (working frame)
3; Lower frame 4a, 4b; Reduction cylinder (pressing cylinder)
5; Upper roll frame 6; Upper leveling roll 7; Upper backup roll 8; Lower leveling roll 9; Lower backup roll 10; Lower roll frame 12; Hydraulic crowning cylinder 20; Leveling roll units 21, 22; Load cell 25; Scanning laser sensor 31; Cylinder body 32; Piston 35; Position detection sensor 36; Oil feed line 38; Pressure detector 39; Control valve 50; Control device 52; Host controller 54; Plate material (material to be corrected)

Claims (12)

A roller leveler that corrects leveling of the plate material by arranging the plate material at an arbitrary position in the width direction of a plate line of the plate material;
A housing;
A plurality of leveling rolls that are arranged in a zigzag pattern above and below the threading line and rotate so as to allow the sheet material to pass while correcting the sheet material,
A plurality of backup rolls for backing up the plurality of leveling rolls up and down;
The leveling roll and the backup roll are supported above and below, a pair of roll frames supported by the housing,
A pair of frames for supporting the pair of roll frames vertically;
Provided at both end portions in the width direction at the entrance side end portion and the exit side end portion of the plate material, respectively, presses an operation frame that is one of the pair of frames toward the passage plate line, and corresponds to the roll frame. A pressing cylinder for pressing the plate material between the leveling rolls through one side;
A driving device for rotating the leveling roll;
A plurality of hydraulic crowning cylinders mounted between the actuating frame and the corresponding one of the roll frames along a width direction orthogonal to the plate passing direction of the plate member;
A plurality of deflection detection sensors provided at positions corresponding to the hydraulic crowning cylinders to detect the deflection of the operating frame;
An offset amount detecting means for detecting an offset amount from the center of the sheet passing line at the center of the plate width of the plate material;
Load measuring means for measuring a load applied to the pressing cylinder;
A control device for controlling leveling correction of the plate material;
Comprising
The controller is
The correction ratio of each end in the width direction is calculated from the offset amount from the center of the plate line at the center of the plate width detected by the offset amount detection means and the load applied to the pressing cylinders at both ends in the width direction. Then, on the entry side and the exit side, the amount of tightening in the pressing cylinders at both ends in the width direction is individually controlled to perform vertical deflection correction in the vertical direction of the housing,
Individually controlling the tightening amounts of the plurality of hydraulic crowning cylinders based on the detection values of the plurality of deflection detection sensors, and performing lateral deflection correction in the width direction of the pair of frames;
From the offset amount detected by the offset amount detection means, the center of the plate width is obtained, the amount of compressive deformation at the center of the plate thickness is calculated based on the load at the center of the plate width and the mill constant of the compressive deformation, and each hydraulic crowning cylinder In this position, the amount of compression deformation at the center of the plate thickness is multiplied by a function of a plate width and an offset amount to individually control the tightening amounts of the plurality of hydraulic crowning cylinders, and the pressing cylinder, the hydraulic type Perform the compression deformation correction of the crowning cylinder, the pair of roll frames, the backup roll, and the leveling roll,
A roller leveler that performs control such that the plate material is pressed through the leveling roll with a pressing amount necessary for correcting the plate material by the pressing cylinder while performing the correction control. A roller leveler that corrects leveling of the plate material by arranging the plate material at an arbitrary position in the width direction of a plate line of the plate material;
A housing;
A plurality of leveling rolls that are arranged in a zigzag pattern above and below the threading line and rotate so as to allow the sheet material to pass while correcting the sheet material,
A plurality of backup rolls for backing up the plurality of leveling rolls up and down;
The leveling roll and the backup roll are supported above and below, a pair of roll frames supported by the housing,
A pair of frames for supporting the pair of roll frames vertically;
Provided at both end portions in the width direction at the entrance side end portion and the exit side end portion of the plate material, respectively, presses an operation frame that is one of the pair of frames toward the passage plate line, and corresponds to the roll frame. A pressing cylinder for pressing the plate material between the leveling rolls through one side;
A driving device for rotating the leveling roll;
A plurality of hydraulic crowning cylinders mounted between the actuating frame and the corresponding one of the roll frames along a width direction orthogonal to the plate passing direction of the plate member;
A plurality of deflection detection sensors provided at positions corresponding to the hydraulic crowning cylinders to detect the deflection of the operating frame;
An offset amount detecting means for detecting an offset amount from the center of the sheet passing line at the center of the plate width of the plate material;
Load measuring means for measuring a load applied to the pressing cylinder;
A control device for controlling leveling correction of the plate material;
Comprising
The controller is
The correction ratio of each end in the width direction is calculated from the offset amount from the center of the plate line at the center of the plate width detected by the offset amount detection means and the load applied to the pressing cylinders at both ends in the width direction. Then, on the entry side and the exit side, the amount of tightening in the pressing cylinders at both ends in the width direction is individually controlled to perform vertical deflection correction in the vertical direction of the housing,
Individually controlling the tightening amounts of the plurality of hydraulic crowning cylinders based on the detection values of the plurality of deflection detection sensors, and performing lateral deflection correction in the width direction of the pair of frames;
A roller leveler that performs control such that the plate material is pressed through the leveling roll with a pressing amount necessary for correcting the plate material by the pressing cylinder while performing the correction control.   The housing is supported by the other frame of the pair of frames that is not the operating frame, the pressing cylinder is disposed between the housing and the operating frame, and the load measuring means is provided between the housing and the pressing cylinder. The roller leveler according to claim 1 or 2 arranged between.   The roller leveler according to claim 1, wherein the offset amount detection unit detects the offset amount by measuring an edge position in a width direction of the plate material.   The roller leveler according to claim 4, wherein the offset amount detection unit measures the edge position by scanning with an irradiation laser.   The roller leveler further includes a plurality of additional deflection detection sensors that detect a deflection of the other frame that is not the operation frame of the pair of frames, and the control device performs the plurality of the deflection when the lateral deflection correction is performed. The roller leveler according to claim 1, wherein the detection value of the additional deflection detection sensor is also taken into consideration. A method of correcting the leveling of the plate material by arranging the plate material at an arbitrary position in the width direction of the plate passing line of the plate material using a roller leveler, the roller leveler,
A housing;
A plurality of leveling rolls that are arranged in a zigzag pattern above and below the threading line and rotate so as to allow the sheet material to pass while correcting the sheet material,
A plurality of backup rolls for backing up the plurality of leveling rolls up and down;
The leveling roll and the backup roll are supported above and below, a pair of roll frames supported by the housing,
A pair of frames for supporting the pair of roll frames vertically;
Provided at both end portions in the width direction at the entrance side end portion and the exit side end portion of the plate material, respectively, presses an operation frame that is one of the pair of frames toward the passage plate line, and corresponds to the roll frame. A pressing cylinder for pressing the plate material between the leveling rolls through one side;
A driving device for rotating the leveling roll;
A plurality of hydraulic crowning cylinders mounted between the actuating frame and the corresponding one of the roll frames along a width direction orthogonal to the plate passing direction of the plate member;
A plurality of deflection detection sensors provided at positions corresponding to the hydraulic crowning cylinders to detect the deflection of the operating frame;
An offset amount detecting means for detecting an offset amount from the center of the sheet passing line at the center of the plate width of the plate material;
Load measuring means for measuring a load applied to the pressing cylinder;
Comprising the steps of:
The correction ratio of each end in the width direction is calculated from the offset amount from the center of the plate line at the center of the plate width detected by the offset amount detection means and the load applied to the pressing cylinders at both ends in the width direction. Then, on the entry side and the exit side, the amount of tightening in the pressing cylinders at both ends in the width direction is individually controlled to perform vertical deflection correction in the vertical direction of the housing,
Individually controlling the tightening amounts of the plurality of hydraulic crowning cylinders based on the detection values of the plurality of deflection detection sensors, and performing lateral deflection correction in the width direction of the pair of frames;
From the offset amount detected by the offset amount detection means, the center of the plate width is obtained, the amount of compressive deformation at the center of the plate thickness is calculated based on the load at the center of the plate width and the mill constant of the compressive deformation, and each hydraulic crowning cylinder In this position, the amount of compression deformation at the center of the plate thickness is multiplied by a function of a plate width and an offset amount to individually control the tightening amounts of the plurality of hydraulic crowning cylinders, and the pressing cylinder, the hydraulic type Perform the compression deformation correction of the crowning cylinder, the pair of roll frames, the backup roll, and the leveling roll,
A plate material correction method in which the plate material is leveled and corrected by pressing the plate material through the leveling roll with a pressing amount necessary for correcting the plate material by the pressing cylinder while performing the correction control. A method of correcting the leveling of the plate material by arranging the plate material at an arbitrary position in the width direction of the plate passing line of the plate material using a roller leveler, the roller leveler,
A housing;
A plurality of leveling rolls that are arranged in a zigzag pattern above and below the threading line and rotate so as to allow the sheet material to pass while correcting the sheet material,
A plurality of backup rolls for backing up the plurality of leveling rolls up and down;
The leveling roll and the backup roll are supported above and below, a pair of roll frames supported by the housing,
A pair of frames for supporting the pair of roll frames vertically;
Provided at both end portions in the width direction at the entrance side end portion and the exit side end portion of the plate material, respectively, presses an operation frame that is one of the pair of frames toward the passage plate line, and corresponds to the roll frame. A pressing cylinder for pressing the plate material between the leveling rolls through one side;
A driving device for rotating the leveling roll;
A plurality of hydraulic crowning cylinders mounted between the actuating frame and the corresponding one of the roll frames along a width direction orthogonal to the plate passing direction of the plate member;
A plurality of deflection detection sensors provided at positions corresponding to the hydraulic crowning cylinders to detect the deflection of the operating frame;
An offset amount detecting means for detecting an offset amount from the center of the sheet passing line at the center of the plate width of the plate material;
Load measuring means for measuring a load applied to the pressing cylinder;
Comprising the steps of:
The correction ratio of each end in the width direction is calculated from the offset amount from the center of the plate line at the center of the plate width detected by the offset amount detection means and the load applied to the pressing cylinders at both ends in the width direction. Then, on the entry side and the exit side, the amount of tightening in the pressing cylinders at both ends in the width direction is individually controlled to perform vertical deflection correction in the vertical direction of the housing,
Individually controlling the tightening amounts of the plurality of hydraulic crowning cylinders based on the detection values of the plurality of deflection detection sensors, and performing lateral deflection correction in the width direction of the pair of frames;
A plate material correction method in which the plate material is leveled and corrected by pressing the plate material through the leveling roll with a pressing amount necessary for correcting the plate material by the pressing cylinder while performing the correction control.   The housing is supported by the other frame of the pair of frames that is not the operating frame, the pressing cylinder is disposed between the housing and the operating frame, and the load measuring means is provided between the housing and the pressing cylinder. The plate material correcting method according to claim 7 or 8, which is disposed between the plates.   9. The plate material correction method according to claim 7, wherein the offset amount is detected by measuring an edge position in the width direction of the plate material by the offset amount detection means.   The said offset amount detection means is the correction method of the board | plate material of Claim 10 which measures the said edge position by the scan of irradiation laser.   The roller leveler further includes a plurality of additional deflection detection sensors that detect a deflection of the other frame that is not the operation frame of the pair of frames, and the method includes the plurality of additional deflection detection sensors when performing the lateral deflection correction. The plate material correction method according to claim 7 or 8, wherein a detection value of an additional deflection detection sensor is also taken into consideration.

Images