JP2002316203A - Method for identifying deformation property of plate mill, and rolling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for identifying deformation characteristics of a plate mill and a rolling method, by which a rolling operation is performed so that right and left elongation percentages of a rolled stock are equal to each other in the rolling of a metallic plate. SOLUTION: In the method for identifying the deformation characteristics of a multistage plate mill having >=4 stages, a kiss roll screw down is performed by manipulating a screw-down device and data sampling by kiss roll screw down for simutaneously sampling the output of load cells for measuring rolling load which are arranged on the work side and the drive side of at least either of the upper and lower rolls of the plate mill, measured values of the screw down locations on the work side and the drive side and the measured values of the thrust reaction force in the direction of the roll axis of work rolls, and preferably all of both the upper and lower rolls between the work rolls and intermediate rolls are respectively performed for every roll rotation stopping state and roll rotating state to a plurality of the conditions of the screw-down location. From these data of the kiss roll screw down, the deformation properties of housings and screw-down systems of the rolling mill on the work side and the drive side and the deformation characteristics of back-up roll bearings on the work side and the drive side are identified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for identifying deformation characteristics of a sheet rolling mill for rolling a metal sheet such as steel, and a rolling method using the same, in order to optimize setting and control of a drafting device. About the method.

[0002]

2. Description of the Related Art One of the important issues in the rolling operation of a metal sheet material is to make the elongation rate of the rolled material equal between the working side and the driving side. In the following, the working side and the driving side will be referred to as left and right for the sake of simplicity. When the difference in elongation becomes uneven in the right and left directions, not only the planar shape and dimensional accuracy of the rolled material such as a camber and a thickness wedge are deteriorated, but also a passing trouble such as meandering and squeezing may occur. As an operating means for equalizing the right and left elongation rates, a left-right difference of a rolling position of a rolling mill, that is, a rolling leveling operation is used. Normally, the operation of rolling leveling, setting before rolling, the operation during rolling, in most cases, the operator is operating while carefully observing the rolling operation, but the above-mentioned poor quality of the camber and the thickness wedge and It cannot be said that threading troubles have been sufficiently controlled.

To solve the above problem, Japanese Patent Publication No. 58-5177
No. 1 discloses a technique for performing a rolling leveling control based on a ratio of a load cell load of a rolling mill to a sum of left and right differences. Japanese Patent Application Laid-Open No. Sho 59-191510 discloses a technique for operating a leveling operation by directly detecting a shift of a rolled material on the entry side of a rolling mill, that is, a meandering amount. The technologies exemplified here to reduce the difference between the left and right of the elongation of the rolled material to zero are all aimed at optimizing the reduction leveling as a control means. There is a left-right difference in the rate,
This is a feedback-type control technique that causes an action after being detected as meandering or camber of a rolled material. In the case of this type of control, there is a significant time delay from the occurrence of a difference between left and right in the elongation rate of the rolled material and the detection of this as meandering or camber. And the problem of camber has not been completely solved.

[0004] Japanese Patent No. 2604528 and Japanese Unexamined Patent Publication No. Hei.
No. 1-347610 is disclosed. Unlike the above-mentioned feedback technology, these technologies accurately grasp the left-right asymmetry of the deformation characteristics of the rolling mill, and also accurately determine the left-right asymmetry of the deformation characteristics such as the dimensions of the rolled material and the deformation resistance. The purpose was to realize an operation that does not generate meandering or camber from the start of rolling of the head of the rolled material by optimally setting the rolling reduction value before starting rolling.

[0005]

The above-mentioned Patent No. 2604
In Japanese Patent Application Publication No. 528, in particular, in order to identify the left-right asymmetry of the deformation characteristics of the rolling mill, the rolling device is operated to perform kiss roll tightening, and the output of the load cell for measuring the rolling position on the working side and the driving side and the rolling load. Is measured for a plurality of rolling position conditions, the deformation of the roll system corresponding to each rolling position condition is calculated and separated, and the resulting asymmetry of the deformation characteristics of the rolling mill housing and the rolling system is determined. There is disclosed a technique for identifying and performing optimum rolling leveling setting by utilizing the deformation characteristics of the rolling mill obtained in this way. Here, the kiss roll tightening means that the upper and lower work rolls are brought into contact with each other in a state where no rolled material is present, and a load is applied between the rolls.

In Japanese Patent Application Laid-Open No. 11-347610, as a method for solving the problem of the above-mentioned Japanese Patent No. 2604528, deformation of a rolling mill housing and a rolling system is determined based on kiss roll tightening data in a state where roll rotation is stopped. Identify the left-right asymmetry of the characteristics, further tighten the kiss roll while the roll is rotating, and stop the roll rotation for the behavior of the left / right total value or the left / right average value of the load cell load for load measurement for rolling against the left / right average value of the rolling position. A technique for determining the deformation characteristics of the reinforcing roll bearing by comparing with the kiss roll tightening data in the state, and using the deformation characteristics of the rolling mill obtained in this way to perform an optimal rolling leveling setting. Is disclosed. Here, the deformation characteristic of the reinforcing roll bearing is a characteristic mainly caused by the lubricating oil film of the reinforcing roll bearing portion. In particular, when the oil film bearing is employed, the oil film thickness is determined by the lubricating oil drawing effect accompanying the roll rotation. Is greatly increased, and as a result, the roll opening changes.

However, when the techniques disclosed in Japanese Patent No. 2604528 and Japanese Patent Application Laid-Open No. 11-347610 were implemented, depending on the rolling mill, the deformation characteristics of the rolling mill housing and the rolling system or the reinforcing roll bearing were identified. In some cases, sufficient reproducibility was not found in the deformation characteristics of, and the set value of the rolling position could not always be optimized. As a result, meandering and camber could not be sufficiently prevented. .

Therefore, in the present invention, the right and left asymmetry of the deformation characteristics of the rolling mill as described above is identified with high reproducibility and high accuracy, and the rolling reduction and rolling reduction of the sheet rolling mill utilizing the results are optimized. An object of the present invention is to provide an identification method that can be performed in a state and a rolling method using the identification method.

[0009]

As a result of a thorough investigation and analysis, the present inventors have found that the difference between the left and right of the rolling load measured by the load cell of the rolling mill is the distribution of the rolling load between the rolled material and the work roll. In addition to the left-right asymmetry, for example, in the case of a four-high rolling mill, between the work roll and the reinforcing roll, in the case of a six-high rolling mill, between the work roll and the intermediate roll, between the intermediate roll and the reinforcing roll, in the roll axis direction It was found that the acting thrust force was included as the largest factor. The thrust force acting between these rolls gives an extra moment to the rolls, and the difference between the left and right rolling loads changes to balance this moment. -It is a serious disturbance for the purpose of grasping the left-right asymmetry of the rolling load distribution generated between the work rolls.

The main cause of the above-mentioned thrust force between the rolls is that, when they come into contact with each other, the rotation axes of the adjacent rolls are displaced from the parallel position by a small gap between the roll chocks and the housing window. When an error occurs in the parallelism between the adjacent roll axes as described above, a deviation component in the roll axis direction occurs in both roll peripheral speed vectors due to roll rotation, and according to the deviation component,
The slip in the roll axis direction always occurs with the roll rotation. The force generated by such slip is the inter-roll thrust force, and the force that continuously generates slip is
This is a thrust reaction force acting from a keeper plate or the like that fixes the roll chocks in the axial direction.

As described above, the inter-roll thrust force is generated by a slight parallelism error between adjacent roll shafts, and its direction and magnitude are generally unknown.
In addition, it is an unstable material that may change from time to time with changes in the roll surface properties. Therefore, even when the deformation characteristics of the rolling mill are grasped from the kiss roll tightening data as described above, the rolling position of the rolling mill housing and the rolling reduction are used as the basic data based on the rolling position on the working side and the driving side and the measured load cell load value for rolling load measurement. Since the lateral asymmetry of the deformation characteristics of the system is identified, when disturbance is mixed in the load cell load due to the thrust force between the rolls as described above, this becomes a large error factor for the identification result of the lateral asymmetry of the deformation characteristics of the rolling mill. You can see that.

With respect to such a disturbance of the thrust force, the method disclosed in Japanese Patent Application Laid-Open No. 11-347610 discloses a method of tightening a kiss roll in a roll rotation stopped state which is considered to be less affected by the disturbance of the thrust force. The data is used to identify the left-right asymmetry of the deformation characteristics of the rolling mill housing and the rolling system, and to eliminate the effect of the thrust force from the kiss roll tightening data when the roll is rotating, The average deformation characteristic of the reinforcing roll bearing is obtained by calculating the left-right average value of the load cell load for measuring the rolling load with respect to the right-left average value, and comparing the average value with the kiss roll tightening data in the roll rotation stopped state.

[0013] However, in the case of using data in which the deformation characteristics of the reinforcing roll bearing are averaged on the left and right as described above, depending on the rolling mill, the individual difference between the working side and the driving side may be ignored as the difference in the setting of the rolling position. In addition, in the method for identifying the deformation characteristics, the kiss roll tightening data in the roll rotation state is compared with the tightening data in the roll rotation stop state in the method for identifying the deformation characteristic, thereby the reinforcing roll bearing is Deformation characteristics are extracted, but depending on the rolling mill, when tightening the kiss roll with the roll stopped, it may not be possible to collect the sample within a sufficient load range due to hardware restrictions. If the reliability of the measurement data is poor due to the bearing receiving a radial load, etc. Suroru tightening data may not be available.

Therefore, in order to accurately identify the left-right asymmetry of the deformation characteristics of the rolling mill, the deformation characteristics of the rolling mill housing and the rolling system and the deformation characteristics of the reinforcing roll bearing are taken into account in consideration of the effect of the inter-roll thrust force. In the case of a rolling mill in which kiss roll tightening data is not available when the roll rotation is stopped, the deformation characteristics and reinforcement of the rolling mill housing and rolling system can be obtained from the tightening data when the roll is rotating. It is necessary to separate and extract the deformation characteristics of the roll bearing.

Therefore, the present invention has solved the above-mentioned various problems, and the gist thereof is as follows.
The present invention according to claim 1 is a method for identifying deformation characteristics of a multi-stage plate rolling mill having four or more stages, and in each of a roll rotation stopped state and a roll rotation state, a kiss roll is tightened by operating a rolling-down device. For a plurality of rolling position conditions, outputs of rolling load measurement load cells provided on at least one or both of the upper and lower working sides and the driving side of the plate rolling mill, and the rolling positions on the working side and the driving side. And the measured values of the roll axial thrust reaction force of all the upper and lower rolls of the work roll, the work roll, and the intermediate roll are preferably collected at the same time. First, the kiss roll tightening data in the roll rotation stopped state For each, the amount of deformation of the roll system corresponding to each rolling position condition is calculated, and from the deformation amount of the entire rolling mill at the rolling fulcrum position evaluated by the change in the rolling position, The amount of deformation of the roll system is separated, the deformation characteristics of the rolling mill housings on the working side and the drive side and the deformation characteristics of the rolling system are extracted. Calculate the deformation amount of the corresponding roll system, and separate the deformation amount of the roll system and the deformation characteristics of the rolling mill housing and the rolling system from the deformation amount of the entire rolling mill at the rolling fulcrum position evaluated by the change in the rolling position. , Extracting deformation characteristics of the work-side and drive-side reinforcing roll bearings and independently identifying the deformation characteristics of the work-side and drive-side rolling mills; The method is summarized.

According to a second aspect of the present invention, there is provided a method of identifying deformation characteristics of a multi-stage plate rolling mill having four or more stages having a roll work bending device, wherein the bending force of the roll rolling device is reduced. The load is changed by two levels, and in each load condition, a kiss roll is tightened by operating a rolling device in a roll rotating state, and for a plurality of rolling position conditions, at least one of the upper and lower sides of the plate rolling mill or The outputs of the rolling load measurement load cells provided on both the working side and the driving side, the measured values of the rolling position on the working side and the driving side, and preferably all of the upper and lower sides of the working roll, the working roll and the intermediate roll Measurements of the axial thrust reaction force in the roll axis direction of the rolls at the same time. For the kiss roll tightening data, calculate the amount of deformation of the roll system corresponding to each rolling position condition, separate the amount of deformation of the rolling system from the amount of deformation of the entire rolling mill at the rolling fulcrum position evaluated by the reduction of the rolling position, By comparing the extracted data other than the amount of deformation of the roll system, the deformation characteristics of the rolling mill housing and the rolling system on the working side and the drive side and the deformation characteristics of the reinforcing roll bearing are separated and extracted. In addition, a gist of the present invention is a method for identifying deformation characteristics of a multi-stage plate rolling mill having four or more stages, wherein a deformation characteristic of a driving-side rolling mill is identified independently.

According to a third aspect of the present invention, there is provided a method for identifying deformation characteristics of a multi-stage plate rolling mill having four or more stages having a reinforcing roll balancing device, wherein the reinforcing roll balancing force of the reinforcing roll balancing device is changed by two levels. Under each load condition, the rolling device is operated in a roll rotating state to perform kiss roll tightening, and for a plurality of rolling position conditions, at least one or both of the upper and lower working sides of the plate rolling mill. And the output of the load cell for rolling load measurement provided on the drive side, the measured value of the reduction position on the work side and the drive side, and the work rolls, the work rolls and the intermediate rolls, preferably the rolls of all the upper and lower rolls Simultaneously collect the measured value of the axial thrust reaction force, and for each kiss roll tightening data with different reinforcing roll balance force, Calculate the amount of deformation of the roll system corresponding to the condition, separate the amount of deformation of the roll system from the amount of deformation of the entire rolling mill at the rolling fulcrum position evaluated by the change in the rolling position, and extract other than the amount of deformation of the roll system. By comparing the obtained data, the deformation characteristics of the rolling mill housing and the rolling system on the working side and the driving side and the deformation characteristics of the reinforcing roll bearing are separated and extracted, and the deformation characteristics of the rolling mills on the working side and the driving side are extracted. Characterized by independently identifying
The gist is a method for identifying deformation characteristics of a multi-stage plate rolling mill having more than one step.

According to a fourth aspect of the present invention, there is provided a method for identifying deformation characteristics of a plate rolling mill according to the first, second or third aspect, wherein the working side and the driving side identified by the identification method are provided. Calibration of the sensitivity of the load cell for measuring the rolling load on one or both of the upper and lower working and driving sides so that the increment ratio of the rolling load to the increment of the deformation characteristics of the rolling mill housing and the rolling system becomes a predetermined value. And calculating the deformation characteristics of the rolling mill housing and the rolling system on the working side and the drive side and the deformation characteristics of the reinforcing roll bearing based on the calibration values. The method is summarized.

According to a fifth aspect of the present invention, there is provided a method for rolling a sheet rolling mill, wherein the method is identified by the method for identifying deformation characteristics of a sheet rolling mill according to the first, second, third or fourth aspect. Based on the deformation characteristics of the rolling mill housing and the rolling system on the working side and the driving side, and the deformation characteristics of the reinforcing roll bearings on the working side and the driving side, the rolling position set values on the working side and the driving side during the rolling operation and / or The gist of the present invention is a rolling method for a sheet rolling mill, which calculates a rolling position control amount.

[0020]

In the method according to the first aspect of the present invention, kiss roll tightening is performed for each of the roll rotation stopped state and the roll rotation state, and the roll is acted on rolls other than the reinforcing rolls for a plurality of roll-down position conditions. The thrust reaction force and the output of the rolling load measurement load cells provided on the upper and lower working and drive sides are measured, and from these kiss roll tightening data, the effect of disturbance due to the thrust force between the rolls is considered. Discloses means for independently extracting the deformation characteristics of the rolling mill housing / pressing system and the deformation characteristics of the reinforcing roll bearing. JP-A-11-34 mentioned above
In the conventional method for identifying the deformation characteristics of a plate rolling mill disclosed in No. 7610 by kiss roll tightening,
According to the present invention, the deformation characteristics of the reinforcing roll bearing are only obtained as a left-right averaged value from the relationship between the left-right total or the left-right averaged load cell load and the left-right average value of the rolling position. According to the method, the procedure of extracting the deformation characteristics of the rolling mill housing and the rolling system and the deformation characteristics of the reinforcing roll bearing independently on the working side and the drive side in consideration of the effect of the thrust force is adopted. The left-right asymmetry of the deformation characteristics can be identified very accurately.

The method of claim 1 of the present invention discloses that the thrust reaction force acting on a roll other than the reinforcing roll is preferably measured even when the roll rotation is stopped. Even in the stopped state, a thrust force acting in the roll axis direction may be generated,
The purpose is to accurately identify the deformation characteristics of the sheet rolling mill in consideration of this effect. In particular, in a rolling mill having a roll axial shift device, when there is residual pressure in the hydraulic cylinder of the shift device, a disturbance similar to the thrust force generated when the roll is rotating may occur.

In the method according to the second aspect of the present invention, when the kiss roll tightening data in the roll rotation stopped state cannot be used due to the restriction on the hardware of the rolling mill as described above, the kiss roll tightening in the roll rotating state is performed. The kiss roll tightening data was obtained based on these kiss roll tightening data.
Considering the influence of disturbance due to the inter-roll thrust force,
By separating the amount of deformation of the roll system, extracting data other than the amount of deformation of the roll system, and comparing the respective data, the deformation characteristics of the rolling mill housing and the rolling system and the deformation characteristics of the reinforcing roll bearing can be left and right independently. A method for separation and extraction is disclosed. In the case of a rolling mill having a decrease work roll bending device of a type that stretches between a reinforcement roll chock and a work roll chock, the decrease bending force is transmitted to the rolling mill housing and the reduction system by bypassing the reinforcement roll bearing. Therefore, in the case of a rolling mill of this type, different loads can be applied to the rolling mill housing and the rolling system and the reinforcing roll bearing by applying the decrease bending force. By comparing the kiss roll tightening data in the above and the kiss roll tightening data under the condition that the decrease bending force is applied, the deformation characteristics of the rolling mill housing and the rolling system and the deformation characteristics of the reinforcing roll bearing are separated and extracted independently. It becomes possible.

As described above, according to the method of the second aspect of the present invention, even when the kiss roll tightening data in the roll rotation stopped state is not available, the effect of the thrust force is taken into consideration and the rolling mill housing and the rolling system are taken into account. Since the deformation characteristics and the deformation characteristics of the reinforcing roll bearings are independently extracted on the working side and the drive side, the right-left asymmetry of the deformation characteristics of the rolling mill can be identified very accurately.

According to a third aspect of the present invention, as in the second aspect, a method for identifying deformation characteristics of a sheet rolling mill in a case where kiss roll tightening data in a state where roll rotation is stopped cannot be used. In the roll rotation state, the deformation characteristics of the rolling mill housing and the rolling system are compared by comparing the kiss roll tightening data under the condition where the reinforcing roll balance force is not applied and the condition where the reinforcing roll balance force is applied, taking into account the disturbance due to the thrust force. And a method of separating and extracting the deformation characteristics of the reinforcing roll bearing independently from each other. In the case of a type of rolling mill in which the roll work bending device is mounted on a project block fixed to the housing, the load cell load and the load acting on the reinforcing roll bearing are always equal. It becomes impossible to separate the deformation characteristics of the rolling system from the deformation characteristics of the reinforcing roll bearing. However, in the case of such a type of rolling mill, if the reinforcing roll balancing device is also a type of rolling mill with a built-in project block, by changing the reinforcing roll balancing force, the same as the above-described decrease bending force is achieved. Can be applied to the reinforcing roll chock. In the case of a rolling mill in which the reinforcing roll balance force cannot be changed, a hydraulic circuit capable of pressure control and measurement is newly provided, and the new hydraulic pressure is set by the switching valve at least only when the deformation characteristics of the rolling mill are identified. The method of the present invention can be used if a test is performed using a circuit under a plurality of levels of balanced loads.

In the method according to the fourth aspect of the present invention, the deformation characteristics of the rolling mill housing and the rolling system identified by the method for identifying the deformation characteristics of a plate rolling mill according to the first, second or third aspect are described. Based on the ratio of rolling load increment to rolling mill housing and rolling system deformation increment in the high load region including the maximum load at the time of kiss roll tightening (hereinafter, referred to as
Calculate the sensitivity calibration value of one or both of the upper and lower rolling load measurement load cells so that the rigidity becomes a predetermined value, and based on this sensitivity calibration value, one or both of the upper and lower The output of the load cell for rolling load measurement is calibrated, and based on the calibrated load value of the load cell, the deformation characteristics of the rolling mill housing and the rolling system on the working side and the drive side and the deformation characteristics of the reinforcing roll bearing are calculated again. I do. By taking such a procedure, the method of claim 4 of the present invention discloses a method of eliminating an error in identifying deformation characteristics of a plate rolling mill caused by an abnormal sensitivity of a load cell. In many rolling mills, the structure of the housing of the rolling mill is the same on the left and right, and the rigidity of the housing is expected to differ depending on the pressure receiving area of the liner in the low load range. It is physically reasonable to consider that there is no extreme left-right difference in the region. In addition, if the rigidity of the rolling mill is checked once in a state where the calibration of the load cell for measuring the rolling load is correct, no extreme change is considered to occur over time. It can be used for Therefore, in the method of claim 4 of the present invention, by taking into account such characteristics, when there is an extreme left-right difference in the rigidity in the high load region of the deformation characteristics of the identified rolling mill housing and the rolling system, Considering that there is an abnormality in the sensitivity of the output of the load cell for rolling load measurement of the kiss roll tightening data used for identification, the rolling is performed so that the right and left stiffness match or match the stiffness value calculated in the past. After calibrating the sensitivity of the load cell for load measurement,
By performing the identification calculation again, the identification error of the deformation characteristics of the plate rolling mill due to the load cell for measuring the rolling load is eliminated. The sensitivity in the present invention refers to a proportional coefficient between current or voltage and load.

As a method for calibrating the sensitivity of the load cell for measuring the rolling load, a roll bending force of an increment operation is applied while the roll gap is open at the time of non-rolling, and the oil pressure of the roll bending device at this time is obtained. Japanese Patent No. 2601975 discloses a method of calibrating the sensitivity of the load cell by analyzing the correspondence between the roll bending force and the output of the load cell for pressure load measurement. However, in the case of this method, while the order of the rolling bending force, which is a reference for calibration, is several hundred tons, whereas the order of the rolling load is several thousand tons, when the calibration value is applied up to the rolling load region, Although a large error may occur, the method of the present invention can be applied without such an error.

According to a fifth aspect of the present invention, there is provided a rolling method for setting a rolling position and / or controlling a rolling position, and the plate rolling mill according to the first, second, third or fourth aspect of the present invention. Based on the deformation characteristics of the rolling mill housing and the rolling system on the working side and the drive side identified by the method for identifying the deformation characteristics of the rolling mill and the deformation characteristics of the reinforcing roll bearing, the right and left asymmetry of the deformation characteristics of the rolling mill can be grasped very accurately. Since the rolling position is set by pressing, stable and highly accurate rolling operation without meandering or camber can be performed. Also,
During the rolling operation after the start of rolling, meandering and thickness wedges occur due to various causes. In order to control this, for example, by observing the change in the output of the load cell for rolling load measurement arranged in the rolling mill, and estimating the thickness wedge from this,
A method of dynamically controlling this to a desired value is applied. When such control is performed, it is necessary to calculate the amount of change in the rolling mill deformation due to the change in the rolling load. By knowing exactly including asymmetry,
The effect of the above-mentioned reduction control is greatly improved.

[0028]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, referring to FIGS. 4 and 5, there are shown a side view and a front view of a working side of a four-high rolling mill as a rolling mill to which the method of the present invention is applied. This 4
The rolling mill is merely an example, and it is needless to say that the present invention can be applied to a rolling mill of 5 or 6 or more stages in which an intermediate roll is further added.

4 and 5, a rolling mill 1 includes a work roll chock 5a, 5b, 5c, 5
d and work rolls 3a, 3b rotatably supported via reinforcing roll chocks 6a, 6b, 6c, 6d;
It is provided with reinforcing rolls 4a and 4b, and constitutes a four-high rolling mill. The housing 2 is provided with a pair of left and right pressing devices 9a and 9b on the working side and the driving side, and controls the gap between the upper and lower working rolls 3a and 3b. Rolling load measurement load cells 7a, 7b, 7c, 7d are provided at the left and right rolling fulcrum positions of the upper and lower reinforcing rolls. 4 and 5, reference numerals 10a and 10b denote increment work roll bending devices, 11a and 11b decrese work roll bending devices, and 13a and 13b.
Is a pass line height adjusting liner. The work rolls 3a and 3b are provided with load cells 8a and 8b for measuring a thrust reaction force acting on the work rolls. Reference numerals 14a and 14b denote keeper plates that are constrained in the roll axis direction.

By using a four-high rolling mill having such a configuration, the vertical and horizontal rolling loads and the rolls other than the reinforcing rolls, ie, the upper and lower work rolls in the case of the examples of FIGS. The acting thrust reaction force can be measured. When the actuator of the work roll shift device is a hydraulic cylinder, the load cells 8a and 8b
Alternatively, the work roll thrust reaction force measuring device may be substituted by a pressure measuring device that measures the pressure in a hydraulic cylinder or a hydraulic pipe directly connected to the hydraulic cylinder. Also,
In the case where the work roll shift device is not provided, a thrust reaction force measuring device provided in the roll chock of the work roll or a device for measuring a load acting on a keeper plate for restraining the work roll chock in the roll axis direction may be adopted. .

Next, with reference to FIGS. 1, 2, 3 and 9, a method for identifying deformation characteristics of a sheet rolling mill and a method for sheet rolling according to an embodiment of the present invention will be described. FIG. 1 is a flow chart showing an algorithm of a first preferred embodiment in the case of a four-high rolling mill, which is a method for identifying deformation characteristics of a sheet rolling mill according to claim 1 of the present invention. The method for identifying the deformation characteristics of the system and the deformation characteristics of the reinforcing roll bearing for the working side and the driving side is shown. Such an operation for grasping the deformation characteristics of the rolling mill is necessary as a preparation operation before starting the rolling operation, and is preferably performed every time the reinforcing roll is replaced.

First, with the roll rotation stopped, the pressing device is operated in the simultaneous right and left pressing mode, and the kiss roll is tightened to a predetermined pressing position in the tightened state (step S10). Here, the simultaneous left and right reduction mode is an operation mode in which the left and right reduction positions are changed by the same amount in the same direction while the left and right difference in the reduction position, that is, the reduction leveling is fixed. As long as the operation is performed in the simultaneous reduction mode, the reduction level does not change. Next, while the roll rotation is stopped, the reduction device is tightened by a fixed amount in the left and right simultaneous reduction mode, and the left and right reduction positions, the vertical and horizontal load cell loads, and the thrust reaction force of the vertical work roll are measured (step S11). ). Step S11 is repeated until data collection at the predetermined rolling position level is completed. That is, it is determined whether or not data collection is completed in step S12. In the case of No, the algorithm returns to step S11 and returns Yes.
In the case of, the process proceeds to step S13. Although it is better to increase the number of the rolling position levels, a practical rolling mill can obtain practical accuracy if data of about 10 to 20 points can be collected. However, at this time, a so-called mill hysteresis often occurs, which causes a difference in the tightening load between the direction in which the screw-down device is tightened and the direction in which the screw-down device is opened. In such a case, at least the tightening direction and the opening direction are different. It is preferable to collect data for one reciprocating operation and perform an operation such as averaging both measured data. In this case, the range of the load corresponding to the range of the rolling down position of the tightening is from a load slightly smaller than a minimum rolling load that may be applied in the rolling operation to a maximum rolling load applied in the rolling operation. It is preferable to make the load slightly larger.

Next, in the roll rotating state, the rolling device is operated in the left and right simultaneous rolling mode, and the kiss roll is tightened to a predetermined rolling position in the tightened state (step S13). Then, the screw-down device is tightened by a fixed amount, and the left and right pressing positions, the vertical and horizontal load cell loads, and the thrust reaction force of the vertical work rolls are measured (step S14). Similar to steps S10 to S12, step S14 is repeated (step S15) until data collection at the predetermined rolling position level is completed. When this step is completed, a series of data collection ends.

Next, the kiss roll tightening data in the roll rotation stopped state collected in steps S10 to S12,
In other words, using the vertical and horizontal load cell loads for each rolling position condition and the measured value of the thrust reaction force of the upper and lower work rolls, the equilibrium condition formula for the axial force acting on the reinforcing roll and the work roll and the moment Based on the equilibrium condition formula, the thrust reaction force of the upper and lower reinforcing rolls, the thrust force acting on each roll, and the left / right difference of the linear load distribution with respect to each rolling position condition in the roll rotation stop state are calculated (step S20). As a specific method of such an operation, for example, a method disclosed in Japanese Patent Application Laid-Open No. 10-263656 can be used. That is, by referring to the schematic diagram of the force in the roll axis direction acting on each roll and the force related to the moment of each roll when tightening the kiss roll in the four-high rolling mill as shown in FIG. Is calculated. From FIG. 8, the upper reinforcing roll,
The equilibrium conditional expressions for the forces in the roll axis direction of the upper work roll, the lower work roll, and the lower reinforcement roll are as follows. _{^{-T WB T = T B T (}} 1) T WB T -T WW = T W T (2) T WW -T WB B = T W B (3) T WB B = T B B (4)

In addition, an upper reinforcing roll, an upper work roll, and a lower crop
The equilibrium condition formula for the moment of the work roll and the lower reinforcing roll is
Given by the formula. T_WB ^T・ (D_B ^T/ 2 + h_B ^T) + P^df _WB ^T(L_WB ^T)^Two/ 12 = P_df ^T・ A_B ^T/ 2 (5) T_WB ^T・ D_W ^T/ 2 + T_WW・ D_W ^T/ 2-p^df _WB ^T(L_WB ^T)^Two/ 12 + p^df _WW(L_WW)^Two/ 12 = 0 (6) T_WB ^B・ D_W ^B/ 2 + T_WW・ D_W ^B/ 2 + p^df _WB ^B(L_WB ^B)^Two/ 12 -p^df _WW(L_WW)^Two/ 12 = 0 (7) T_WB ^B・ (D_B ^B/ 2 + h_B ^B) -P^df _WB ^B(L_WB ^B)^Two/ 12 = -P_df ^B・ A_B ^B/ 2 (8) where P_df ^T, P_df ^BAre the upper and lower rolling load measuring
Difference of the output of the load cell, T_W ^T, T_W ^BIs the top and bottom work
Thrust reaction force acting on the work roll, T_B ^T, T_B ^BIs above
Thrust reaction force acting on the lower reinforcing roll chock, T_WB
^TIs the thrust acting between the upper work roll and the upper reinforcing roll
Power, T_WWIs the thrust force acting between the upper and lower work rolls, T
_WB ^BIs the thrust acting between the lower work roll and the lower reinforcing roll.
Force, p^df _WB ^TIs the wire load between the upper work roll and the upper reinforcing roll
Left-right difference of multiple distribution, p^df _WB ^BIs lower work roll to lower reinforcement roll
Left and right difference of linear load distribution between^df _WWIs between upper and lower work rolls
Left and right difference of linear load distribution of D_B ^T, D_B ^B, D_W ^T, D
_W ^BAre the upper and lower reinforcing roll diameters, upper and lower
Industry roll diameter, l_WB ^T, L_WW, L_WB ^BEach
Upper reinforcing roll-upper working roll contact area, upper and lower working roll
Contact area, lower reinforcement roll to lower work roll contact area
This is the length in the rule axis direction. Also, h_B ^T, H_B ^BIs above and below
Action point position and reinforcement of thrust reaction force acting on reinforcement roll
The distance from the roll axis position, for example, a known thrust
Force by observing the change in the reaction force of the reinforcing roll.
Identify. Note that in equations (5) and (8),
T using (1) and (4)_B ^TAnd T_B ^BErase
ing. Equations (1) to (8) above are applied to each rolling position condition.
And solve them simultaneously to reinforce the unknown upper and lower
Roll thrust reaction force T_B ^T, T_B ^BActs on each roll
Thrust force T_WB ^T, T_WW, T_WB ^BAnd linear load distribution
Left-right difference p^df _WB ^T, P^df _WB ^B, P^df _WWIs calculated.

Next, from the result of the calculation in step S20, a calculation is performed including the left-right difference of the deformation amount (roll deflection, roll flatness) of the reinforcing roll and the work roll at each rolling position condition, and the roll system for each rolling position condition is calculated. The amount of deformation is calculated (step S21). The method of specifically calculating the amount of deformation of the roll system is described in Japanese Patent Publication No. 4-74084.
Since the load distribution between the rolls is obtained from the calculation result of step S20 by the method disclosed in Japanese Patent Application Laid-Open Publication No. H10-209, the bending deformation and the flat deformation of the reinforcing roll and the work roll are calculated including the difference between the left and right sides. It is possible to calculate the displacement that occurs at the fulcrum position of the reinforcing roll as a result of these deformations.

Next, when the roll is stopped, the kislo is stopped.
Rolling support evaluated by change in rolling position of tool tightening data
From the deformation of the entire rolling mill at the point position,
Subtract the amount of deformation of the roll system in S21,
The left and right deformation characteristics are calculated independently (step S2).
2). The amount of deformation of the entire rolling mill is evaluated based on the change in the rolling position.
The roll system at the position of the fulcrum
Of the deformation of the housing and the pressure reduction system
Calculate left and right independently. It should be noted that the work side and drive side housings
The deformation of the rolling and rolling system₀ ^W, Δ₀ ^DThen,
Output of load cells for rolling load on the industrial side and drive side
One of the upper and lower outputs is the reference load P _W, P_DWhen
Then Δ₀ ^W, Δ₀ ^DIs a discrete function:
It can be expressed. Δ₀ ^W= Δ₀ ^W(P_W) (9) Δ₀ ^D= Δ₀ ^D(P_D(10) In this way, the accurate identification of the thrust force between rolls
Of the housing and rolling system
It is possible to accurately grasp the deformation characteristics including the difference between the left and right
Will be possible.

Next, from the kiss roll tightening data in the roll rotation state collected in steps S13 to S15, the same processing as in steps S20 to S21 is performed to calculate the amount of deformation of the roll system for each rolling position condition. (Step S23). Further, based on the deformation amount of the entire rolling mill at the rolling fulcrum position evaluated by the rolling position change of the kiss roll tightening data in the roll rotating state, the deformation amount of the roll system in step S23 and the deformation amount in step S22 are determined.
The deformation characteristics of the housing / press-down system are subtracted to extract the deformation characteristics of the reinforcing roll bearing independently for the left and right (step S
24).

As described above, in the method of the first aspect of the present invention, taking into account the effect of the thrust force, the deformation characteristics of the rolling mill housing and the rolling system and the deformation characteristics of the reinforcing roll bearing are independent on the working side and the drive side. Since the procedure of extracting the right and left asymmetry is adopted, it is possible to identify the left-right asymmetry of the deformation characteristics of the rolling mill very accurately.

The kiss roll tightening measurement in the roll rotation state similar to the above steps S13 to S15 is performed by changing the number of roll rotations by several levels.
By performing the calculation of 4, the deformation characteristics of the reinforcing roll bearing for each roll rotation speed can be obtained. In this case, the deformation characteristics τ ^W and τ ^D of the reinforcing roll bearings on the working side and the driving side can be expressed as the following functions as discrete functions of the roll rotation speed n and the rolling load. τ ^W = τ ^W (P _W , n) (11) τ ^D = τ ^D (P _D , n) (12)

FIG. 2 shows a method for identifying deformation characteristics of a plate rolling mill having a roll-bending device for reducing work according to claim 2 of the present invention.
10 is a flowchart showing an algorithm of the embodiment of the present invention, and shows a method of identifying the deformation characteristics of the housing / press-down system of the rolling mill and the deformation characteristics of the reinforcing roll bearing for each of the working side and the driving side.

First, the roll-down device is operated in the simultaneous left-right reduction mode under the condition that the roll rotating state and the decrease bending force of the roll operation roll bending device are not loaded, and the kiss roll is tightened to the predetermined reduction position in the tightened state ( Step S30). In this case, it is preferable that the condition bending bending force be no-load condition. However, if it is difficult due to facility restrictions, a condition close to no-load is set. Then, with the roll rotating state and the decrease bending force of the roll work roll bending device kept under no load condition, tighten the reduction device by a fixed amount in the left and right simultaneous reduction mode, the left and right reduction positions, the upper and lower and left and right load cells. The load and the thrust reaction force of the upper and lower work rolls are measured (Step S31). Step S31 is repeated until data collection at the predetermined rolling position level is completed (step S32). The rolling position level and the range of the tightening load are preferably the same as those in the method shown in FIG.

Next, under the condition that the roll bending state of the roll bending apparatus and the roll rotating state of the roll working apparatus is a load, the reduction apparatus is operated in the simultaneous right and left reduction mode, and the kiss roll is tightened to a predetermined reduction position in the tightened state. (Step S33). At this time, the decrease bending force is determined in steps S30 to S32.
It is preferable to apply as large a load as possible under a load condition different from that at the time of measurement. With the roll rotating state and the decrease bending force of the roll bending device kept under the load condition, tighten the reduction device by a fixed amount in the left and right simultaneous reduction mode,
The left and right load cell loads and the thrust reaction force of the upper and lower work rolls are measured (step S34), and the above step S3 is performed.
Similar to steps 0 to S32, step S34 is repeated until data collection at the predetermined rolling position level is completed (step S35). If this step is completed, a series of data collection ends.

Next, the same calculation processing as in steps S20 to S21 in FIG. 1 is performed from the kiss roll tightening data under the condition that the decrease bending force obtained in steps S30 to 32 is no load, and Calculate the amount of deformation of the roll system (step S4
0) The amount of deformation of the roll system in step S40 is subtracted from the amount of deformation of the entire rolling mill at the rolling fulcrum position evaluated by the change in the rolling position of the kiss roll tightening data under the condition that the decrease bending force is no load. The deformation characteristic data other than the amount of deformation of the system is independently extracted left and right (step S41). Next, steps S33 to S35
The same processing as in steps S20 to S21 of FIG. 1 is performed from the kiss roll tightening data under the condition of the load of the decrease bending force obtained in the step (b) to calculate the amount of deformation of the roll system for each rolling position condition (step S42). ). Next, the amount of deformation of the roll system in step S42 is subtracted from the amount of deformation of the entire rolling mill at the rolling fulcrum position where the decrease bending force is evaluated by the change in the rolling position of the kiss roll tightening data under the load condition. The left and right deformation characteristic data other than the deformation amount are extracted independently (step S43).

Next, by comparing the data other than the amount of deformation of the roll system calculated in steps S41 and S43, the rolling mill housing and the rolling system on the working side and the driving side with respect to the amount of change in the decrease bending force. Then, the ratio between the deformation increment and the deformation increment of the reinforcing roll bearing is calculated (step S44). Finally, based on the ratio of the deformation increment of the rolling mill housing and the rolling system on the working side and the drive side calculated in step S44 and the deformation increment of the reinforcing roll bearing, the step S44 is performed.
From the data other than the roll deformation amount calculated in 41, the deformation characteristics of the rolling mill housing and the rolling system and the deformation characteristics of the reinforcing roll bearing are separated and extracted independently for the left and right sides (step S45).

As described above, according to the method of the second aspect of the present invention, even when the kiss roll tightening data in the roll rotation stopped state cannot be used, the effect of the thrust force is taken into consideration and the rolling mill housing and the rolling system are taken into account. Since the deformation characteristics and the deformation characteristics of the reinforcing roll bearings are independently extracted on the working side and the drive side, the right-left asymmetry of the deformation characteristics of the rolling mill can be identified very accurately.

Further, by performing the kiss roll tightening measurement and identification calculation shown in FIG. 2 while changing the level of the roll rotation speed, the deformation characteristics of the reinforcing roll bearing can be identified for each roll rotation speed. It can be expressed as a function of the roll rotation speed and the rolling load as shown in the equations (11) and (12). However, the deformation characteristics of the rolling mill housing and the rolling system are also obtained for each level of the roll rotation speed. However, since these characteristics are originally unrelated to the roll rotation speed, these separately obtained values are averaged. Then, the deformation characteristics of the rolling mill housing and the rolling system may be calculated.

In the above deformation characteristic identification method,
In the case where only the decrease bending force is changed, it is considered that the work roll and the reinforcing roll do not come into contact with each other over the entire length of the roll under a large tightening load, especially under a large tightening load. Due to the difference between the calculated value of the profile and the actually measured value, a calculation error occurs in the roll deformation amount, and there is a risk that the accuracy of estimating the deformation characteristics of the housing / press-down system may deteriorate. Therefore, in order to avoid such a problem, it is preferable to apply the increase bending force by the same amount as the amount of change in the decrease bending force so that the load on the work roll chock is balanced. However, in the case of a rolling mill in which the reinforcing roll chock embraces the work roll chock,
If the increase bending force is applied so as to be balanced with the decrease bending force, the reinforcement roll arm will be closed by the arm (the portion holding the reinforcement roll), and the load on the housing and the rolling system will be reduced. And the load of the reinforcing roll bearing will not be differentiated. Therefore, in the case of such a rolling mill type, the above-described increase bending load is not applied.

The third preferred embodiment of the method for identifying deformation characteristics of a plate rolling mill having a reinforcing roll balancing device according to the third aspect of the present invention in the case of a four-high rolling mill is shown in FIG. This embodiment is the same as the embodiment in which the lease bending force is replaced with the reinforcing roll balance force. However, in the deformation characteristic identification method according to the third aspect of the present invention, as shown in FIGS. 6 and 7, reinforcing roll balance devices 12a and 12b are provided, and the reduction work roll bending devices 11a and 11b are fixed to the housing. Applied to rolling mills of the type deployed in a project block. As shown in FIGS. 6 and 7, when the decrease work roll bending device is provided in a project block fixed to the housing, the load cell load and the load acting on the reinforcing roll bearing are always equal, so that the decrease bending work is performed. The force makes it impossible to separate the deformation characteristics of the housing / press-down system from the deformation characteristics of the reinforcing roll bearing. However, as shown in FIGS. 6 and 7, when the reinforcing roll balancing device also has a built-in project block, By changing the reinforcing roll balance force, it is possible to apply a load similar to the above-described decrease bending force to the reinforcing roll chock.

In the case of the reinforcing roll balance device of the project block type as described above, if only the reinforcing roll balance force is changed, the change in the force is closed only at the upper or lower portion of the housing, and the housing post is closed. Since the load does not change, the deformation of the rolling mill will have a different deformation pattern than in the case of normal load cell load change, and the risk of deteriorating the separation accuracy between the deformation characteristics of the housing / rolling system and the deformation characteristics of the reinforcing roll bearings Will be higher. In order to avoid such a situation, it is preferable to change the decrease bending force and the increase bending force by the same amount as the change in the reinforcing roll balance force.

FIG. 9 is a flow chart showing an algorithm according to a fourth embodiment of the present invention, which is a method for identifying deformation characteristics of a sheet rolling mill according to a fourth aspect of the present invention, in the case of a four-high rolling mill. The sensitivity of the load cell for measuring a rolling load based on the deformation characteristics of the rolling mill housing and the rolling system on the working side and the driving side identified by the method for identifying deformation characteristics of a plate rolling mill according to claim 1, 2, or 3. And a method for re-identifying the deformation characteristics of the housing / press-down system of the rolling mill and the deformation characteristics of the reinforcing roll bearing based on the calibration values.

Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.
However, for the sake of simplicity, the upper and lower
Of the outputs of the left and right rolling load load cells, the reference load P
_A method for calibrating the sensitivities for _W and P _D will be described.
In addition, by changing the upper and lower reference loads, the sensitivity of the other rolling load measurement load cell can be similarly calibrated.To calibrate the sensitivity of both the upper and lower rolling load measurement load cells, The method shown may be repeated by changing the reference load up and down. First, output values Q _W and Q _D of the calibrated rolling load measuring load cell on the working side and the driving side are defined as follows. Q _W = a _W * P _W + b _W (13) Q _D = a _D * P _D + b _D (14) where a _W and a _D are sensitivity correction values for the rolling load on the working side and the driving side, b _W and b _D are zero-point correction values of the rolling loads on the working side and the driving side.

Claim 1, Claim 2 or Claim of the present invention
Work identified by the method for identifying deformation characteristics of a plate rolling mill described in 3
-Side and drive-side rolling mill housing and rolling system deformation
High load including the maximum load when tightening the kiss roll from the characteristics
The area data is extracted (step S60), and the rolling mill
Rolling load for incremental deformation characteristics of jing and rolling systems
Of the working and drive sides of the mill.
Sex K_W, K_D Is calculated from the following equation (step S61). K_W = DP_W/ DΔ₀ ^W (P_W ^min <P_W<P_W ^max ) (15) K_D= DP_D/ DΔ₀ ^D (P_D ^min <P_D<P_D
^max (16) where P_W ^min, P_D
^min Indicates the area of the rolling load for which the rigidity is to be calculated.
And the minimum rolling load on the drive side._W ^max , P_D ^max 
Indicates the maximum rolling loads on the working and drive sides in the above area.
You. Note that the above equations (9) and (10) are discrete functions.
Then, for example, by linear approximation by the method of least squares, K
_W , K _D Ask for.

FIG. 10 shows an example of the identification results of the deformation characteristics of the rolling mill housing and the rolling system on the working side and the driving side of the actual hot strip mill finishing rolling mill equipped with the equivalent equipment shown in FIGS. ing. When calculated according to the above procedure, the stiffnesses K _W and K _D of the working side and the drive side of the rolling mill are calculated.
Is as follows. _{K W = 730tonf / mm (P} W min ≒ 500, P W max ≒ 700) (17) K D = 580tonf / mm (P D min ≒ 500, P D max ≒ 700) (18) thus obtained Based on the stiffnesses K _W , K _D , these values are compared on the working side and the driving side, or compared with the values calculated in the past, and are matched with the calculated values. sensitivity correction value a _W, calibrating the a _D.

The rolling load measurement of the kiss roll tightening data collected by the identification method according to claim 1, 2 or 3, based on the sensitivity correction values a _W and a _D of the rolling load measuring load cell obtained above. Calibrate the sensitivity of the output value of the load cell. In this case, when the zero point correction values b _W and b _{D of the} load cell for rolling load measurement are also obtained, for example, the roll bending force disclosed in Japanese Patent No. 2601975 is applied, and the roll bending force and the pressure load measurement are measured. Alternatively, only the zero-point correction values b _W and b _D may be obtained using the sensitivity correction values a _W and a _D obtained in the present invention by using a method of analyzing the correspondence relationship with the output value of the load cell for use. After calibrating the output value of the load cell for rolling load measurement in this way, using the identification method according to claim 1, claim 2, or claim 3,
The deformation characteristics of the rolling mill housing and the rolling system on the working side and the drive side and the deformation characteristics of the reinforcing roll bearing are recalculated (step S63). In this case, the upper and lower of the reference load were changed, the sensitivity of the other rolling load measuring load cell was calibrated, and the sensitivity of both the upper and lower rolling load measuring load cells was corrected. The deformation characteristics of the housing and the pressing system and the deformation characteristics of the reinforcing roll bearing may be calculated again.

FIG. 3 is a flowchart showing an algorithm according to a fifth embodiment, which is a rolling method for a plate rolling mill according to a fifth embodiment of the present invention, and is a flowchart according to any one of the first to fourth embodiments. An example of a method of setting an optimal rolling leveling using the deformation characteristics of the rolling mill housing and the rolling system on the working side and the driving side identified by the method and the deformation characteristics of the reinforcing roll bearings on the working side and the driving side is shown. .

First, the rolling conditions such as the width of the rolled material to be rolled, the incoming thickness, the target outgoing thickness, the rolling speed, and in the case of hot rolling, the deformation resistance characteristic value including the rolling temperature are described. Input (step S50). Next, the rolling load is predicted and calculated in consideration of the input rolling conditions and the conditions on the rolling mill side such as the work roll diameter and the work roll elastic constant (step S51).

Next, based on the calculated values of the rolling load and the rolling speed, the deformation of the rolling mill housing and rolling system on the working side and the driving side identified by the method according to the first, second, third or fourth embodiment. Based on the characteristics and the deformation characteristics of the reinforcing roll bearings on the working side and the driving side, the deformation amounts of the plate rolling mills other than the roll system are individually calculated on the working side and the driving side (Step S).
52). Further, the amount of deformation of the roll system is calculated from the rolling load, and the change in the roll gap at the working side end and the driving side end is calculated from the amount of change and the amount of deformation of the plate rolling mill other than the roll system (step). S53). Finally, a roll-down leveling set value is calculated from the calculated value of the roll gap change and a left-right difference of the plate thickness, that is, a target value of the plate thickness wedge, and the roll-down leveling setting is executed based on the calculated value (step S54). Here, the target thickness wedge is normally a symmetrical thickness distribution, that is, the thickness wedge is zero, but there is a thickness wedge that cannot be ignored in the entry side thickness, and this was corrected by one-pass rolling. In this case, when it is determined that meandering, camber, or poor flatness occurs, it is also preferable to set a non-zero thickness wedge target. In this way, by accurately calculating the deformation characteristics of the rolling mill including the left-right asymmetry and performing the rolling reduction,
In both the thickness and the thickness wedge at the center of the width of the strip, higher accuracy than the rolled material head can be realized.

In the case where dynamic rolling leveling control is performed during the rolling, for example, a paper “Hot Strip Rolling in Hot Rolling,” published in 1980, pp. 61-64 (1980) Study on meandering control method (Part 1
Report) (by Nakajima, Kikuma, Matsumoto, Kajiwara, Kimura, Tagawa), using the first-class parallel stiffness and the second-class parallel stiffness to determine the left-right measured value of rolling load fluctuation during rolling. From the measured data, predict the fluctuation of the thickness wedge of the rolled material,
The rolling leveling control amount to make this a desired value is
Calculate based on the deformation characteristics of the rolling mill housing and rolling system on the working side and the drive side, and the deformation characteristics of the reinforcing roll bearing,
Perform control. By executing such control, it is possible to suppress the meandering and the thickness wedge caused by the fluctuation factors occurring during rolling to a level that does not cause any practical problem. When such control is performed, the rolling load is appropriately calibrated using the sensitivity correction value of the load cell for measuring the rolling load calculated by the method of claim 4 of the present invention, and then the rolling-down leveling is performed. It goes without saying that more precise control can be realized by performing the control.

[0060]

According to the present invention, the deformation characteristics of the plate rolling mill can be identified much more accurately than in the prior art, and the setting and control of the rolling position can be performed. As a result, meandering and rolling in the rolling operation can be performed. The frequency of occurrence of threading troubles is greatly reduced, and the camber of rolled material and the thickness wedge can also be significantly reduced, so that the cost reduction and quality improvement required for rolling can be achieved at the same time. .

[Brief description of the drawings]

FIG. 1 is a flowchart showing an algorithm of a first preferred embodiment in the case of a four-high rolling mill, which is a method for identifying deformation characteristics of a sheet rolling mill according to claim 1 of the present invention.

FIG. 2 is a flow chart showing an algorithm according to a second preferred embodiment of the present invention for a four-high rolling mill, which is a method for identifying deformation characteristics of a plate rolling mill having a roll work bending device according to claim 2 of the present invention.

FIG. 3 is a flowchart showing an algorithm according to a fifth embodiment of the rolling method for a sheet rolling mill according to claim 5 of the present invention.

FIG. 4 is a side view from the working side of the rolling equipment for describing a preferred embodiment of the present invention.

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a side view from the working side of the rolling equipment for explaining a preferred embodiment of the third aspect of the present invention.

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a schematic diagram of a force in a roll axis direction acting on each roll and a force related to a moment of each roll when a kiss roll is tightened in a four-high rolling mill.

FIG. 9 is a flowchart showing an algorithm according to a fourth preferred embodiment of the present invention, which is a method for identifying deformation characteristics of a plate rolling mill according to claim 4, in the case of a four-high rolling mill.

FIG. 10 is a diagram showing an example of a range of a high load range in which rigidity is compared in identification results of deformation characteristics of a rolling mill housing and a rolling system on a working side and a driving side of an actual hot strip mill finishing mill.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Four-high rolling mill 2 ... Housing 3a, 3b ... Work roll 4a, 4b ... Reinforcement roll 5a, 5b, 5c, 5d ... Work roll chock 6a, 6b, 6c, 6d ... Reinforcement roll chock 7a, 7b, 7c, 7d ... Rolling Load cells for load measurement 8a, 8b: Load cells for thrust reaction force measurement 9a, 9b: Roll-down devices 10a, 10b: Increment work roll bending devices 11a, 11b: Decrease work roll bending devices 12a, 12b: Reinforcement roll balance devices 13a, 13b: Pass line height adjustment liner 14a, 14b: Keeper plate 15a, 15b, 15c, 15d: Output of load cell for rolling load measurement 16: Load distribution between upper work roll and upper reinforcement roll 17: Line between upper and lower work rolls Load distribution 18 ... Lower work roll to lower reinforcement roll Linear load distribution

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B21B 37/00 Y (72) Inventor Kenji Yamada 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division (72) Inventor Koichi Yamazaki 5-3 Tokaicho, Tokai City, Aichi Prefecture Inside Nippon Steel Corporation Nagoya Works (72) Inventor Akihiro Ikeda 5-3 Tokaicho, Tokai City, Aichi Prefecture Nippon Steel Corporation Nagoya Works F-term (reference) 4E024 CC01 CC02 CC03 DD02 DD05 DD10

Claims (5)

[Claims] 1. A method for identifying deformation characteristics of a multi-stage plate rolling mill having four or more stages, wherein in each of a roll rotation stopped state and a roll rotation state, a kiss roll tightening operation is performed by operating a rolling-down device, and a plurality of rolling-down operations are performed. For the position condition, the output of the load cell for rolling load measurement provided on at least one or both the working side and the drive side of the upper and lower of the plate rolling mill, and the measured value of the rolling position on the working side and the drive side, Among the work rolls, the work rolls and the intermediate rolls, preferably, the measured values of the thrust reaction force in the roll axial direction of all the upper and lower rolls are simultaneously collected. Calculate the amount of deformation of the roll system corresponding to the condition, and calculate the deformation of the roll system from the amount of deformation of the entire rolling mill at the rolling fulcrum position evaluated by the change in the rolling position. The deformation amount of the rolling mill housing and the rolling system on each of the working side and the driving side is extracted, and then the kiss roll tightening data of the roll rotating state is extracted from the roll system corresponding to each rolling position condition. The amount of deformation is calculated, and the amount of deformation of the roll system and the deformation characteristics of the rolling mill housing and the rolling system are separated from the amount of deformation of the entire rolling mill at the rolling fulcrum position evaluated by the change in the rolling position. A deformation characteristic identification method for a multi-stage plate rolling mill having four or more stages, wherein a deformation characteristic of a reinforcing roll bearing on a side is extracted and deformation characteristics of a rolling mill on a working side and a driving side are independently identified. 2. A method for identifying deformation characteristics of a multi-stage plate rolling mill having four or more stages having a roll work bending device, comprising: changing the roll bending force of the roll roll bending device by two levels;
In each load condition, the rolling device is operated in the roll rotating state to perform kiss roll tightening, and for a plurality of rolling position conditions, at least one or both of the upper and lower working sides and the driving side of the plate rolling mill. The output of the deployed rolling load measurement load cell, the measured values of the work-side and drive-side reduction positions, and the roll axial thrust resistance of all the upper and lower rolls of the work roll, the work roll, and the intermediate roll, preferably. Simultaneously collect the measured values of the force, calculate the amount of deformation of the roll system corresponding to each rolling position condition for each kiss roll tightening data having a different bending bending force, and calculate the rolling fulcrum position evaluated by the rolling position change The amount of deformation of the roll system is separated from the amount of deformation of the entire rolling mill in the above, and each extracted amount other than the amount of deformation of the roll system is extracted. By comparing the deformation characteristics of the rolling mill housing and the rolling system on the working side and the driving side and the deformation characteristics of the reinforcing roll bearing, the deformation characteristics of the rolling mills on the working side and the driving side can be independently extracted. A method for identifying deformation characteristics of a multi-high rolling mill having four or more stages, characterized by identifying. 3. A method for identifying deformation characteristics of a multi-stage plate rolling mill having four or more stages having a reinforcing roll balancing device, wherein the reinforcing roll balancing device is loaded by changing the reinforcing roll balancing force by two levels. In the roll rotation state, the rolling device is operated to perform kiss roll tightening by operating the rolling device, and is disposed on at least one or both of the upper and lower working sides and the driving side of the plate rolling mill for a plurality of rolling position conditions. The output of the load cell for measuring the rolling load, the measured value of the reduction position on the working side and the driving side, and the measured value of the roll axial direction thrust reaction force of all the upper and lower rolls of the work roll, the work roll and the intermediate roll. At the same time, and for each kiss roll tightening data having different reinforcing roll balance force, the roll system corresponding to each rolling position condition Calculate the amount of deformation, separate the amount of deformation of the roll system from the amount of deformation of the entire rolling mill at the rolling fulcrum position evaluated by the change in the rolling position, and compare the extracted data other than the amount of deformation of the roll system. By separating and extracting the deformation characteristics of the rolling mill housing and the rolling system on the working side and the driving side and the deformation characteristics of the reinforcing roll bearing, the deformation characteristics of the rolling mills on the working side and the driving side can be independently identified. A method for identifying deformation characteristics of a multi-stage plate rolling mill having four or more stages. 4. A method for identifying deformation characteristics of a plate rolling mill according to claim 1, wherein the rolling mill housing and the rolling system on the working side and the driving side identified by the identification method. A calibration value of the sensitivity of the load cell for measuring the rolling load on one or both of the upper and lower working and driving sides is calculated so that the increment ratio of the rolling load to the increment of the deformation characteristic becomes a predetermined value, and the calibration value is calculated. A deformation characteristic of a rolling mill housing and a rolling system on a working side and a driving side, and a deformation characteristic of a reinforcing roll bearing are re-calculated based on the method. 5. A rolling method for a plate rolling mill, comprising: a working side and a driving side identified by the method for identifying deformation characteristics of a plate rolling mill according to claim 1, 2, 3, or 4. Based on the deformation characteristics of the rolling mill housing and the rolling system, and the deformation characteristics of the work-side and drive-side reinforcing roll bearings, a work-side and drive-side rolling position set value and / or a rolling position control amount at the time of rolling execution are calculated. A rolling method for a plate rolling mill, characterized in that: