JP2005000976A - Method for controlling meandering in rolling mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a control method for meandering by which pinching in the tail end part of a rolled stock is prevented by accurately controlling the meandering of the rolled stock in rolling operation. <P>SOLUTION: In the control method for meandering in a rolling mill, the meandering of a rolled stock is prevented by measuring respective rolling loads on the driving side and the operation side at least on one side of the upper and lower sides of a multi roll mill having four or more stages, obtaining load difference or a load difference rate and performing the reduction/leveling control of the rolling mill on the basis of the obtained value. Furthermore, in this method, the influence coefficient of axial thrust force between rolls which affects on the load difference or the load difference rate and the influence coefficient of the axial thrust force between work rolls and a rolled stock are calculated, thrust reaction force in the roll axis direction of all rolls at least on one side of the upper and lower sides among rolls other than back-up rolls is measured at the same time of the measurement of rolling load, the load difference or the load difference rate is corrected on the basis of the measured thrust reaction force in the axial direction of the roll and the influence coefficient of both thrust forces and the reduction/leveling control is performed on the basis of the corrected load difference or the corrected load difference rate. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a meandering control technique for a rolled material in a rolling operation, and particularly to a technique for preventing narrowing caused by meandering when a tail end portion passes through a rolling mill.
[0002]
[Prior art]
In rolling operation, especially hot continuous rolling operation, when the tail end of the rolled material passes through the rolling mill of each stand, when the so-called tail slips, the rolled material is laterally displaced in the width direction of the rolling mill (hereinafter referred to as meandering). There is a case in which a phenomenon called squeezing occurs, in which the tail end portion of the rolling member is in contact with a side guide provided on the inlet side of the rolling mill and the rolled material is folded. When the narrowing occurs, an excessive rolling load is applied to the rolling mill, so that the rolling roll gets wrinkled, and in some cases, the rolling roll breaks and becomes incapable of rolling.
[0003]
A technique for avoiding such rolling trouble, that is, a control technique for preventing meandering and passing a rolled material straight through a rolling line is generally called meandering control technique. As one of the meandering control technologies, there is a strong correlation between the rolling load difference between the driving side and the working side of the rolling mill and the amount of meandering. So-called leveling control for controlling the position is known.
The conventional technique for controlling meandering by reduction leveling control, for example, detects the rolling load on at least one of the upper and lower working sides and the driving side of a multi-high rolling mill having four or more stages, and obtains the load difference or the load difference rate. In the meandering control method for controlling the rolling leveling of the rolling mill based on the value and preventing meandering of the non-rolled material, a step of calculating a roll axial thrust force influence coefficient on at least one of the upper and lower load difference or the load difference rate And the roll axial direction thrust reaction force of at least one of the upper and lower rolls other than the reinforcing roll is measured at the same time as the rolling load measurement, and the load difference or load is determined based on the measured value and the thrust force influence coefficient. The rolling mill includes a step of correcting the difference rate and a step of controlling the reduction leveling based on the corrected load difference or the load difference rate. It had been meandering control of the tail end (e.g., see Patent Document 1).
[0004]
[Patent Document 1]
JP 2000-312911 A (2nd page, FIG. 1)
[0005]
[Problems to be solved by the invention]
In addition to the left-right asymmetry of the rolling load distribution between the rolling material and the work roll, for example, in the case of a four-high rolling mill, between the work roll and the reinforcing roll, In the case of a 6-high rolling mill, between the work roll and the rolled material, the roll axial thrust force acting between the rolls such as the work roll and the intermediate roll and the intermediate roll and the reinforcing roll is included as a major factor. As presented in the prior art, the axial thrust force acting between the work roll and the rolled material is also a major factor. These thrust forces give an extra moment to the roll, and the roll axial distribution of contact load between the rolls changes to balance this moment, which is finally measured in the rolling load load cell of the rolling mill. It will appear as a disturbance to the load difference.
However, in Japanese Patent Laid-Open No. 2000-312911, in calculating the thrust force influence coefficient for removing the influence of disturbance, the thrust force generated between the rolls is specified as between the work roll and the reinforcing roll, Since the influence of the thrust force generated between the roll and the rolled material is not taken into consideration, there is a problem that the accuracy of meandering control decreases due to the disturbance of this portion.
[0006]
This invention was made in order to solve the above problems, and more specifically identifies the disturbance included in the rolling load measured by the load cell for rolling load, and the rolling load in which the influence of this disturbance is corrected. An object of the present invention is to provide a rolling meandering control method with high accuracy by performing reduction leveling control based on the difference or rolling load difference rate.
[0007]
[Means for Solving the Problems]
The meandering control method for a rolling mill according to the present invention determines the load difference or the load difference ratio by measuring the rolling load on at least one of the upper and lower drive sides and the working side of a multi-stage rolling mill having four or more stages, and based on this value. In the meandering control method of the rolling mill for controlling the rolling leveling control of the rolling mill to prevent the meandering of the rolled material, the influence coefficient of the axial thrust force between the rolls on the load difference or the load difference rate and the axial direction between the rolling material and the work roll The thrust force influence coefficient is calculated, and simultaneously with the measurement of the rolling load, the roll axial direction thrust reaction force of at least one of the upper and lower rolls excluding the reinforcing rolls is measured. The load difference or load difference rate of the rolling load is corrected based on the influence coefficient of the thrust force, and the rolling leveling control is performed based on the corrected load difference or load difference rate.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a rolling mill to which a meandering control method for a rolling mill according to Embodiment 1 of the present invention is applied. FIG. 1 (a) is a front view as viewed from the sheet passing direction, and FIG. Side surface sectional drawing of a center part is shown. FIG. 2 is a flowchart for explaining the first embodiment of the present invention. As shown in FIG. 1, a pair of upper and lower work rolls (hereinafter abbreviated as WR) 2a and 2b for rolling the rolled material 1, and a pair of reinforcing rolls (hereinafter abbreviated as BUR) 3a and 3b provided on the upper and lower sides thereof. The case of the four-high rolling mill configured as described above will be described.
[0009]
Work roll chocks 4a to 4d are provided on both sides of the WR 2a and 2b, that is, the drive side and the work side (hereinafter simply referred to as right and left as appropriate), and reinforcing roll chocks 5a to 5d are provided on the left and right sides of the BURs 3a and 3b. Yes. The rolled material 1 is rolled through the BUR 3a and WR 2a by rolling down the upper reinforcing roll chock 5a, 5b with the rolling down devices 6a, 6b. BUR reaction force measurement load cells 7a and 7b for detecting the left and right rolling loads are provided between the left and right reduction devices 6a and 6b and the reinforcing roll chock 5a and 5b, and a work roll chock 4b is provided on the upper WR 2a. A thrust reaction force measurement load cell 8 for measuring the reaction force in the axial direction of the WR 2a is provided. Further, a roll polishing apparatus 9 for polishing the surface of the WR 2a is disposed. The information from each load cell 7a, 7b, 8 and the information from the roll polishing device 9 are collected in the arithmetic device 10, and based on the result calculated by the arithmetic device 10 based on these information, the reduction devices 6a, 6b. It is configured to control the leveling of the roll.
[0010]
First, the disturbance included in the rolling load measured by the BUR reaction force measurement load cells 7a and 7b in the rolling leveling control will be described. In the rolling process, if thrust force is generated in the roll axis direction of each roll, these thrust forces give an extra moment to the roll, and the distribution of contact load between the rolls in the roll axis direction changes to balance this moment. This finally appears as a disturbance to the left-right difference in rolling load measured by the BUR reaction force measurement load cells 7a, 7b of the rolling mill. Therefore, if these thrust forces are measured and the influence on the rolling load difference is eliminated, more accurate meandering control can be performed.
[0011]
The thrust force in the roll axis direction is the sum of the thrust force Twb acting between the upper WR 2a and the upper BUR 3a and the thrust force Tws acting between the rolled material 1 and the upper WR 2a in the case of a four-high rolling mill as shown in the figure. Yes, this is the WR thrust reaction force Tw measured by the thrust reaction force measuring load cell 8 through the work roll chock 4b. Therefore, by grasping the degree of the effect of this Tw on the left and right rolling load difference, and subtracting the influence of this thrust force from the measured left and right rolling load difference of the load cells 7a, 7b, accurate reduction leveling control can be performed. It can be carried out.
[0012]
Assuming that the actually measured rolling load difference between the left and right load cells 7a and 7b is Pdf, the rolling load difference Pdf1 obtained by subtracting the influence of the disturbance due to the thrust force is calculated as follows.
Pdf1 = Pdf− (fwb + fws) · Tw (1)
However, Pdf1: Left and right load cell rolling load difference Pdf after subtracting the influence of thrust force Pdf: Rolling load difference Tw of actually measured load cells 7a, 7b: WR thrust reaction force fwb of actually measured load cell 8 WR-BUR affecting rolling load difference Influence coefficient fws of inter-thrust force: It is an influence coefficient of the thrust force between the rolled material and WR on the rolling load difference.
[0013]
The influence coefficient fwb of the WR-BUR thrust force exerted on the above-described difference in rolling load is an influence coefficient determined from the position of the acting point of the thrust reaction force acting on the BUR, and rolling of the left and right load cells by applying a known thrust force. It can be determined by observing changes in the load difference.
The influence coefficient fws of the thrust force between the rolled material and WR on the rolling load difference is to observe the change of the rolling load difference between the left and right load cells based on the analysis result by rolling simulation and the actual measurement result as described below. The table value can be obtained by Table values of the influence coefficient fwb of the WR-BUR thrust force and the influence coefficient fws of the rolled material-WR thrust force are calculated in advance.
[0014]
The calculation of the influence coefficient fws of the thrust force between the rolled material and WR will be described in more detail. Generally, in the WR of a rolling mill, a rolled portion is worn by rolling a rolled material. If the wear progresses, a difference in level from the non-rolled portion or a change in the surface roughness of the WR may affect the product quality. The roll polishing apparatus 9 shown in FIG. 1 is an apparatus that polishes the worn surface of the WR 2a online or offline. In the invention according to the present embodiment, attention is paid to the fact that the surface roughness and properties of WR, that is, the surface profile has a correlation with the thrust force between the rolled material and WR, and by measuring this surface profile, the rolled material-WR The influence coefficient fws of the inter-thrust force is obtained. As a means for this, in the present embodiment, the roll polishing apparatus 9 provided on the WR 2a is pressed against the WR 2a with a constant force to move the surface of the WR 2a in the axial direction, and the pressing stroke displacement of the head of the roll polishing apparatus 9 is measured to measure the WR 2a. The surface profile data is collected, and these data and the data of the reaction force Tw in the thrust direction of the WR 2a measured by the load cell 8 for measuring the thrust reaction force are analyzed to create a data table of the influence coefficient in advance.
[0015]
Hereinafter, the procedure of the meandering control method of the rolling mill according to the present embodiment will be specifically described with reference to the flowchart of FIG. First, as the first step, the influence coefficient fwb of the thrust force generated between the rolls on the left and right rolling load difference of the rolling device provided on at least one of the upper and lower rolls of the rolling mill is calculated by the above method. (FIG. 1 shows an example of a four-high rolling mill. As an example, fwb between BUR3a and WR2a is calculated.) Also, the influence coefficient fws of the thrust force generated between the rolled material 1 and WR2a on the rolling load difference is calculated. A large number of data indicating the relationship between the WR2a thrust reaction force Tw and the surface profile of WR2a, which is data for calculation, are collected by the above method and prepared as table values. This step is performed in advance prior to actual meandering control.
[0016]
Next, as the second step, at the time of passing through the tail end portion of the actual rolling process, the left and right rolling loads Pd and Pw of at least one of the upper and lower sides (upper part in FIG. 1) are applied to the BUR reaction force measuring roll load cells 7a and 7b. taking measurement. In addition, the thrust reaction force Tw in the roll axial direction of all of the upper and lower rolls (WR2a in FIG. 1) other than the reinforcing roll is measured by the load cell 8 for measuring the thrust reaction force. Further, the surface profile of WR2a is measured by a roll polishing device 9 provided in WR2a of the rolling mill. Each measurement value is output to the arithmetic unit 10.
[0017]
Next, as a third step, in the arithmetic unit 10, the left and right rolling loads Pd, Pw and the roll axial thrust reaction force Tw measured as described above, and the inter-roll thrust force influence coefficient fwb calculated in advance, Based on the influence coefficient fws of the rolling material-WR thrust force obtained from the measured WR surface profile and the table value prepared in the first step, the influence of the thrust force is calculated by the equation (1). The rolling load difference Pdf1 between the left and right load cells is calculated by subtracting.
[0018]
Next, as the final fourth step, a rolling leveling control amount ΔSdf is obtained from the rolling load difference Pdf1 between the left and right load cells corrected by subtracting the influence of the thrust force, and output to the rolling down devices 6a and 6b. On the basis of this, the above-described procedure is repeatedly performed for the reduction leveling control for suppressing the meandering. These calculation controls are performed while the sheet is being passed through, but the calculation is performed by a simple expression such as that shown in Expression 1, and can be sufficiently executed even in a short time of several seconds at the time of missing.
[0019]
In the above description, the roll polishing apparatus disposed in the WR section is used as a means for collecting the surface profile of the WR. However, the present invention is not limited to this. For example, a surface profile meter may be used.
[0020]
Further, instead of the rolling load difference, a load difference ratio obtained by dividing the difference between both loads on the driving side and the working side by the sum of both loads may be used by correcting this with the thrust influence coefficient.
[0021]
In the above description, the case where the load difference Pdf of the rolling load measured by the load cells 7a and 7b is used has been described. Using the time differential value dPdf / dt, the dPdf / dt is expressed as an influence coefficient fwb of the thrust force and Correction by fws may be performed to calculate dPdf1 / dt, and the reduction leveling control amount may be calculated by multiplying the differential gain.
[0022]
In the above example, the case where the load cell for measuring the BUR reaction force and the load cell for measuring the thrust reaction force are provided on the upper side of the rolled material has been described, but may be provided on the lower side of the rolled material. Alternatively, both the upper and lower rolling loads may be controlled by correcting the difference between the left and right rolling loads with the influence coefficient of the thrust force.
[0023]
Furthermore, in the case of a rolling mill having 6 or more stages, a thrust reaction force measuring load cell is also provided in the intermediate roll, and the influence coefficient between the BUR and the intermediate roll on the rolling load difference and the intermediate roll-WR on the rolling load difference. The influence coefficient between the WR and the rolling plate on the difference in rolling load and the rolling load difference are obtained, and the rolling load difference is corrected by subtracting the result of multiplying the measured load cell thrust reaction force by the influence coefficient from the measured rolling load difference. Then, the reduction leveling amount may be calculated from the corrected rolling load difference and controlled in the same manner as described above.
[0024]
As described above, according to the invention of the present embodiment, between the rolling material and the work roll calculated based on the influence coefficient of the thrust force between the rolls and the surface profile of the work roll of the rolling mill obtained by measurement. Based on the influence coefficient of thrust force and the measured thrust reaction force in the roll axial direction, the load difference or load difference rate of the rolling load on the drive side and work side is corrected, and the leveling is reduced based on the corrected load difference or load difference rate. Since the control is performed, the meandering generated when the rolled material passes through the rolling mill can be accurately controlled, and the narrowing of the rolled material at the bottom can be prevented.
[0025]
Embodiment 2. FIG.
FIG. 3 is a configuration diagram of a rolling mill to which a meandering control method for a rolling mill according to Embodiment 2 of the present invention is applied, (a) is a front view as viewed from the sheet passing direction, and (b) is a diagram of (a). Although it is side surface sectional drawing of a center part, the side view of the preceding stage rolling mill is shown instead of the side view of this rolling mill. FIG. 4 is a flowchart for explaining the second embodiment of the present invention. In FIG. 3, reference numerals 1 to 10 are the same as those in FIG. The difference from FIG. 1 is that the surface profile is measured at the WR of the preceding rolling mill instead of the WR of the rolling mill. In other words, the roll grinding machine 9 provided in the WR section of the preceding rolling mill is configured to obtain WR surface profile data of the preceding rolling mill. Hereinafter, this difference will be mainly described.
[0026]
In the first step of the flowchart of FIG. 4, as in the first embodiment, the influence coefficient fwb of the inter-roll thrust force on the rolling load difference or the load difference rate of at least one of the upper and lower rolls is calculated. At the same time, as the data for calculating the influence coefficient fws of the thrust force between the rolling material and the WR on the rolling load difference or the load difference rate, the WR surface profile data of the preceding rolling mill is obtained by the roll polishing apparatus 9 provided in the preceding rolling mill. A large number of samples are collected and analyzed as a table value by analyzing the relationship with the WR2a thrust reaction force Tw of the rolling mill. This step is performed in advance prior to actual meandering control. Since the surface profile of the WR of the former rolling mill is considered to be substantially the same as the surface profile of the WR of the present rolling mill, the surface profile is collected by the former rolling mill in consideration of the work flow.
[0027]
In the second step, at the time of passing through the rolling mill in the actual rolling process, at least one of the left and right rolling loads Pd and Pw is measured by the BUR reaction force measurement load cells 7a and 7b. At the same time, the thrust reaction force Tw in the roll axial direction of all the upper and lower rolls other than the reinforcing rolls is measured by the load cell 8 for measuring the thrust reaction force. Further, the surface profile of the WR is measured by the roll polishing device 9 provided in the WR section of the former rolling mill. Each measurement value is output to the arithmetic unit 10.
[0028]
Hereinafter, the third and fourth steps are the same as those in FIG. 2 described in the first embodiment, and thus description thereof is omitted.
[0029]
As described above, according to the invention of the present embodiment, the influence coefficient of the thrust force between the rolled material and the WR is calculated and predicted based on the surface profile data of the WR of the preceding rolling mill. In the process, by performing the surface profile sampling process that takes time for measurement in the former rolling mill, the load cell data obtained on the rolling mill side can be calculated immediately after the measurement, in addition to the effects of the first embodiment, Even when processing in a short time is required like the tail end of the rolled material, it can be controlled quickly.
[0030]
Embodiment 3 FIG.
FIG. 5: is a block diagram of the rolling mill which applied the meandering control method of the rolling mill by Embodiment 3 of this invention, (a) is the front view seen from the sheet-feeding direction, (b) is (a). Although it is side surface sectional drawing of a center part, the side view of the preceding stage rolling mill is shown instead of the side view of this rolling mill. FIG. 6 is a flowchart for explaining the third embodiment of the present invention. 5, reference numerals 1 to 8 and 10 are the same as those in FIG. The difference from FIG. 1 of the first embodiment is that the surface profile is measured not on the WR of the rolling mill but on the surface of the rolled material 1 on the outlet side of the preceding rolling mill. That is, before the rolled material rolled by the preceding rolling mill is rolled by the main rolling mill, the profile meter 11 provided in the vicinity of the surface of the rolled material 1 is configured to obtain the surface profile data of the rolled material 1. Yes. Hereinafter, this difference will be mainly described.
[0031]
Of the WR thrust reaction force Tw, focusing on the fact that the thrust force Tws acting between the rolled material 1 and WR2a has a correlation with the surface profile of the rolled material 1, and measuring this surface profile, The influence coefficient fws of the thrust force between WR2a is calculated | required. Referring to the flowchart of FIG. 6, first, as the first step, the influence coefficient fwb of the thrust force between the rolls on the load difference or the load difference rate of at least one of the upper and lower rolls is calculated as in the first embodiment.
Further, as the data for calculating the influence coefficient fws of the thrust force between the rolled material 1 and WR2a, a lot of surface profile data of the rolled material 1 is collected by the profile meter 11, and the relationship with the WR2a thrust reaction force Tw is analyzed and used as a table value. prepare. This step is performed in advance prior to actual meandering control.
[0032]
Next, as a second step, at least one of the upper and lower rolling loads Pd, Pw on the upper and lower sides, all of the upper and lower roll axial thrust reaction forces Tw other than the reinforcing rolls 5a to 5c, and the rolled material 1 And measure the surface profile.
[0033]
Hereinafter, the third and fourth steps are the same as those in FIG. 2 described in the first embodiment, and thus description thereof is omitted.
[0034]
As described above, according to the invention of the present embodiment, based on the surface profile data of the rolled material, the influence coefficient of the thrust force between the rolled material and the WR is measured by the profile meter provided on the exit side of the preceding rolling mill. Since the calculation and prediction are performed, data from the rolled material immediately before rolling can be used in real time, so that more accurate meandering control can be performed.
[0035]
Embodiment 4 FIG.
FIG. 7: is a block diagram of the rolling mill which applied the meandering control method of the rolling mill by Embodiment 4 of this invention, (a) is the front view seen from the sheet-feeding direction, (b) is (a). It is side surface sectional drawing of a center part. FIG. 8 is a flowchart for explaining the fourth embodiment of the present invention. In FIG. 7, reference numerals 1 to 10 are the same as those in FIG. The difference from FIG. 1 of Embodiment 1 is that the surface of WR2a is obtained by a roll polishing device 9 provided in the WR2a portion of the rolling mill as means for collecting data for calculating the influence coefficient fws of the thrust force between the rolled material and WR. In addition to obtaining the profile data, the meandering amount of the rolled material 1 is measured by the meandering sensor 12 provided on the exit side of the preceding rolling mill. Hereinafter, this difference will be mainly described.
[0036]
In the first step of FIG. 8, as in the first embodiment, first, the influence coefficient fwb of the thrust force between rolls on the rolling load difference or the load difference rate of at least one of the upper and lower rolls is calculated. At the same time, the surface profile data of WR2a is obtained by the roll polishing apparatus 9 provided in the WR2a portion of the rolling mill as data for calculating the influence coefficient fws of the rolling material-WR thrust force on the rolling load difference or the load difference rate. A large number of samples are collected, and a large number of meandering amount data of the rolled material 1 are also collected by the meandering sensor 12, and the relationship between these and the WR2a thrust reaction force Tw is analyzed and prepared as a table value. This step is performed in advance prior to actual meandering control.
[0037]
Next, as a second step, in the actual sheet passing process, at least one of the upper and lower rolling loads Pd, Pw on the upper and lower sides, and at least one of the upper and lower roll axial thrust reaction forces Tw other than the reinforcing rolls. Then, the surface profile of WR2a and the meandering amount of the rolled material 1 are measured.
[0038]
Next, in the third step and the fourth step based on these measured values, the reduction leveling control is performed based on the calculated thrust force influence coefficients fwb and fws, as in the first embodiment. .
[0039]
As described above, according to the invention of the present embodiment, the influence coefficient of the rolling material-WR thrust force is obtained by the surface profile of the WR of the rolling mill and the meandering sensor provided on the outlet side of the preceding rolling mill. Since the calculation is made based on the surface profile of the rolled material, the influence coefficient can be calculated with higher accuracy than in the first to third embodiments, so that accurate meandering control can be performed.
[0040]
【The invention's effect】
As described above, according to the meander control method of the rolling mill of the present invention, the calculation was made based on the influence coefficient of the thrust force between the rolls of the rolling mill and the surface profile of the work roll of the rolling mill obtained by measurement. Based on the influence coefficient of the thrust force between the rolled material and the work roll and the measured roll axial thrust reaction force, the load difference or the load difference ratio of the rolling load on the drive side and the work side is corrected, and the corrected load difference Or, the reduction leveling control is performed based on the load difference ratio, so that the meandering that occurs when the rolled material passes through the rolling mill can be controlled with high accuracy, and it is possible to prevent the rolling material from being narrowed down when it falls out. A stable rolling operation can be carried out.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a rolling mill to which a meandering control method for a rolling mill according to Embodiment 1 of the present invention is applied.
FIG. 2 is a flowchart illustrating Embodiment 1 of the present invention.
FIG. 3 is a configuration diagram of a rolling mill to which a meandering control method for a rolling mill according to a second embodiment of the present invention is applied.
FIG. 4 is a flowchart illustrating Embodiment 2 of the present invention.
FIG. 5 is a configuration diagram of a rolling mill to which a meandering control method for a rolling mill according to Embodiment 3 of the present invention is applied.
FIG. 6 is a flowchart for explaining the third embodiment of the present invention;
FIG. 7 is a configuration diagram of a rolling mill to which a meandering control method for a rolling mill according to a fourth embodiment of the present invention is applied.
FIG. 8 is a flowchart for explaining the fourth embodiment of the present invention;
[Explanation of symbols]
1 Rolled material 2a, 2b Work roll (WR)
3a, 3b Reinforcement roll (BUR)
6a, 6b Reduction devices 7a, 7b BUR reaction force measurement load cell 8 Thrust reaction force measurement load cell 9 Roll polishing device 10 Arithmetic device 11 Profile meter 12 Meander sensor.

Claims (5)

Measure the rolling load on at least one of the upper and lower drive and working sides of a multi-high rolling mill with four or more stages to determine the load difference or load difference ratio, and perform rolling reduction control on the rolling mill based on this value. In the meandering control method of the rolling mill for preventing the meandering of the material, the influence coefficient of the axial thrust force between the rolls and the influence coefficient of the axial thrust force between the rolled material and the work roll on the load difference or the load difference rate are calculated. Simultaneously with the measurement of the rolling load, the roll axial thrust reaction force of at least one of the upper and lower rolls excluding the reinforcing rolls was measured, and the measured roll axial thrust reaction force and the influence coefficient of both thrust forces were measured. A rolling meandering control method, comprising: correcting a load difference or a load difference rate of the rolling load based on the rolling load, and performing a rolling leveling control based on the corrected load difference or the load difference rate The meandering control method for a rolling mill according to claim 1, wherein the influence coefficient of the axial thrust force between the rolling material and the work roll is based on a work roll surface profile obtained by measuring the surface of the work roll of the rolling mill. A meandering control method for a rolling mill, characterized by: The meandering control method for a rolling mill according to claim 1, wherein the influence coefficient of the axial thrust force between the rolling material and the work roll is based on a work roll surface profile obtained by measuring the surface of the work roll of the preceding rolling mill. A meandering control method for a rolling mill, characterized by: The meandering control method for a rolling mill according to claim 1, wherein the influence coefficient of the axial thrust force between the rolled material and the work roll is obtained by measuring the profile of the rolled material on the exit side of the preceding rolling mill. A meandering control method for a rolling mill, characterized in that the calculation is based on a profile. The meandering control method for a rolling mill according to claim 1, wherein the influence coefficient of the axial thrust force between the rolling material and the work roll is determined by measuring a work roll surface profile obtained by measuring a surface of the work roll of the rolling mill; A meandering control method for a rolling mill, characterized in that the meandering amount is calculated based on the meandering amount of the rolled material obtained by measuring the meandering amount of the rolled material on the exit side of the rolling mill.

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