JP6707043B2 - Rolling control device and rolling control method - Google Patents

Description

The present invention relates to a rolling control device and a rolling control method suitable for plate thickness control in consideration of roll eccentricity.

In the plate thickness control in the rolling mill, the eccentricity of the backup roll causes a plate thickness deviation, which is a problem. Normally, in order to reduce the influence of the eccentricity of the backup roll on the strip thickness deviation, the roll eccentricity component is learned from the variation of the rolling load or the strip thickness deviation on the delivery side of the rolling mill to reduce the rolling position of the rolling mill. Roll eccentricity control is used to control the.

By the way, the signals of the rolling load fluctuation amount and the plate thickness deviation include many components other than the influence of the roll eccentricity. Therefore, in roll eccentricity control, it is common practice to learn or integrate the eccentricity amount according to the upper and lower roll rotation angles to extract the roll eccentricity component, or to calculate the roll eccentricity component by Fourier transform. It is being appreciated.

In order to reduce the influence of the roll eccentricity on the plate thickness deviation, the learning coefficient and the control gain are set to be large so that the actual roll eccentricity and the amount of change in the rolling position coincide with each other. Generally, the plate thickness variation due to roll eccentricity includes a frequency component that is 1 to N times the rotation of the upper and lower backup rolls, and the period of roll eccentricity changes depending on the rolling speed. Therefore, when a disturbance element such as a tension fluctuation close to the rotation frequency of the roll or a frequency N times that of the roll occurs, a resonance system is formed near the frequency and the strip thickness deviation on the delivery side of the rolling mill deteriorates. Furthermore, the strip thickness deviation signal on the rolling mill exit side is easily affected by the strip thickness deviation on the rolling mill entry side, the hardness unevenness of the material to be rolled, and the tension on the rolling mill entry side and exit side, and other than roll eccentricity. There are many disturbances. Therefore, a mechanism for detecting only the roll eccentricity component is required to suppress the influence of resonance and disturbance.

For example, Patent Document 1 discloses a technique of removing the plate thickness deviation due to roll eccentricity by accurately extracting the eccentricity components of the two upper and lower backup rolls by Fourier transform. Further, in Patent Document 2, a gauge meter plate thickness deviation calculated from a roll gap and a rolling load is compared with a plate thickness deviation detected by an exit side plate thickness gauge of a rolling mill, and the difference is taken as a roll eccentricity signal, A technique for detecting a roll eccentricity component by Fourier transform is disclosed.

JP, 2006-272446, A International Publication No. 2009/136435

However, the technique disclosed in Patent Document 1 cannot remove the influence of resonance or disturbance caused by the phase shift of the roll eccentricity control output. Therefore, it is possible to remove the plate thickness fluctuation component up to about the same frequency as each rotation frequency of the upper and lower backup rolls and up to about 2 times, but it is possible to remove the plate thickness fluctuation component at a frequency higher than 3 times the rotation frequency. Can not. Therefore, it is not possible to remove high-frequency components (frequency components that are multiple times the rotation frequency of the upper and lower backup rolls) among the variation components of the plate thickness deviation due to roll eccentricity.

The technique disclosed in Patent Document 2 theoretically enables correct detection of the roll eccentricity amount, but in reality, when the rolling speed is high, the roll eccentricity amount can be determined. There is a problem that it cannot be detected accurately. Since the actual reduction position control device is composed of dedicated hardware, there is a constraint on the update time of the reduction position data when the actual value of the reduction position is etafaced from the reduction position control device to the roll eccentricity control device. Occurs. Therefore, when the rolling speed is high, the update delay in pressing position data occurs, it can not be calculated correctly gauge meter thickness, a problem that can not be able to accurately detect the roll eccentricity occurs.

An object of the present invention is to accurately detect a high frequency component of a roll eccentricity amount (a frequency component that is a multiple of a backup roll rotation frequency) and reduce a strip thickness deviation due to roll eccentricity, and a rolling control device. It is to provide a control method.

A rolling control device according to the present invention is a rolling control device that controls a rolling mill that rolls a material to be rolled with a rolling roll, wherein the material to be rolled is based on a variation in a rolling load received from the rolling rolls, and A first roll eccentricity calculation unit that calculates a first roll eccentricity of a rolling roll, and a second roll eccentricity of the rolling roll based on a sheet thickness deviation of the material to be rolled from the rolling mill. A second roll eccentricity amount calculation unit that calculates a roll eccentricity amount, the first roll eccentricity amount calculation unit, and the second roll eccentricity amount calculation unit for each predetermined rotation angle increment of the rolling roll. A roll eccentricity that is learned every time the rolling roll makes one rotation, a roll eccentricity calculated by adding the first roll eccentricity and the second roll eccentricity calculated by A learning unit and a roll eccentricity control output unit that outputs the roll eccentricity amount learned by the roll eccentricity learning unit to a reduction position control device that controls the reduction position of the rolling roll. .

ADVANTAGE OF THE INVENTION According to this invention, the rolling control apparatus and rolling control method which can detect accurately the roll eccentricity amount of the frequency component of the multiple times of the backup roll rotation frequency, and can reduce the plate thickness deviation by roll eccentricity are provided. To be done.

The figure which showed the example of the roll eccentricity control structure in the rolling control apparatus which concerns on the 1st Embodiment of this invention, and the structural example of the rolling mill which is the control object. (A) is a diagram showing an example of a rolling load fluctuation amount ΔP and plate thickness deviation Δh caused by roll eccentricity, (b) is a diagram showing an example of a calculated value of roll eccentricity, and (c) FIG. 4 is a diagram showing a diagram showing an example of a detected value of an amount of roll eccentricity. (A) is a diagram showing an example of a rolling load fluctuation amount ΔP and plate thickness deviation Δh caused by a disturbance other than roll eccentricity, (b) is a diagram showing an example of a calculated value of a roll eccentricity, and FIG. 6C is a diagram showing an example of the detected value of the roll eccentricity amount. The figure which showed the example of a detailed structure of the roll eccentricity learning part which learns the roll eccentricity of a backup roll. The figure which showed the example of the roll eccentricity control structure in the rolling control apparatus which concerns on the 2nd Embodiment of this invention, and the structural example of the rolling mill which is the control object.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each drawing, common components are designated by the same reference numerals, and redundant description will be omitted.

<<First Embodiment>>
FIG. 1 is a diagram illustrating an example of a roll eccentricity control configuration in a rolling control device 100 according to a first embodiment of the present invention and an example of a configuration of a rolling mill 150 that is a control target thereof. As shown in FIG. 1, a rolling mill 150 that rolls the material 1 to be rolled is provided with six-stage rolling rolls including backup rolls 2 and 3, intermediate rolls 4 and 5, and work rolls 6 and 7. Further, the rolling mill 150 is provided with a rolling position control device 8, a rolling load detector 9, a delivery side plate thickness detector 10, backup roll rotation detectors 11 and 12, and the like.

Here, the reduction position control device 8 controls the reduction position and the gap of the work roll 7 to the target position. Further, the rolling load detector 9 installed on the upper part of the backup roll 2 detects the rolling load on the material 1 to be rolled, and the exit side plate thickness detector 10 measures the plate thickness of the material 1 to be rolled after rolling. . The backup roll rotation detectors 11 and 12 detect the rotation angles of the backup rolls 2 and 3, respectively.

The detection of the rotation angles of the backup rolls 2 and 3 is not limited to the method using the backup roll rotation detectors 11 and 12. The rotation angle is the rotation angle detected by the rotation detector of the electric motor that drives the work rolls 6, 7 or the intermediate rolls 4, 5, the diameter of the work rolls 6, 7 or the intermediate rolls 4, 5 and the diameter of the backup roll 2. It is also possible to obtain based on the ratio of Further, a sensor for detecting one rotation or one-half rotation of the backup rolls 2 and 3 may be installed to improve the detection accuracy of each rotation angle.

The rolling control device 100 includes roll eccentricity calculation units 13, 14, roll eccentricity transfer processing units 20, 21, 30, 31, roll eccentricity learning units 22, 32, roll eccentricity control output calculation unit 24, 34, a roll eccentricity control output unit 40, and other processing function blocks. Further, the rolling control device 100 is configured to include storage function blocks such as the roll eccentricity amount learning tables 23 and 33.

Here, the two roll eccentricity amount calculation units 13 and 14 are classified into a load mode and a plate thickness mode depending on which of the rolling load fluctuation amount and the plate thickness deviation is used to calculate the roll eccentricity amount. On the other hand, the two roll eccentricity learning units 22 and 23 are distinguished by which of the upper backup roll 2 and the lower backup roll 3 the roll eccentricity is learned. The four roll eccentricity transfer processing units 20, 21, 30, 31 transfer the roll load fluctuation amount, the plate thickness deviation, and the roll eccentricity of either the upper backup roll 2 or the lower backup roll 3. It is distinguished by whether to do.

The rolling control device 100 having the above configuration is configured by a digital control circuit including a general computer. In that case, the functions of the functional processing blocks constituting the rolling control device 100 are realized by an arithmetic processing unit of a computer executing a predetermined program stored in a storage device such as a main memory. The storage function blocks such as the roll eccentricity learning tables 23 and 33 are configured in the storage device of the computer.

Hereinafter, the function of each functional processing block constituting the rolling control device 100 will be described in detail.

<Roll eccentricity calculation unit 13, 14>
The load mode roll eccentricity calculation unit 13 calculates a rolling load fluctuation amount ΔP from the rolling load detected by the rolling load detector 9, and further, based on the rolling load fluctuation amount ΔP, a load mode roll eccentricity amount. Calculate ΔS _REC (ΔP).

Here, the rolling load fluctuation amount ΔP is obtained by subtracting a predetermined reference value from the rolling load detected by the rolling load detector 9. Here, the predetermined reference value is, for example, an average value of the rolling load detected by the rolling load detector 9 while the backup roll 2 or the backup roll 3 makes one revolution. Alternatively, the predetermined reference value may be a rolling load detected at a specific rotation angle, or a rolling load value set as a reference value in advance.

The load mode roll eccentricity calculation unit 13 calculates the roll mode eccentricity ΔS _REC (ΔP) in the load mode by the following equation (1). However, in this case, the rolling mill 150 is not in the process of rolling the material 1 to be rolled, but the work rolls 6 and 7 are simply in contact with the material 1 to be rolled.

The roll eccentricity amount calculation unit 14 in the plate thickness mode calculates the roll eccentricity amount ΔS _REC (Δh) in the plate thickness mode based on the plate thickness deviation Δh of the rolled material 1 detected by the exit side plate thickness detector 10 as follows. It is calculated by the equation (2).

Assuming that the strip thickness deviation Δh on the delivery side of the rolling mill is not caused by the roll eccentricity but is caused by the hardness unevenness of the material to be rolled 1 and other disturbances, the rolling load fluctuation amount ΔP is It occurs according to the sheet thickness deviation Δh on the output side. In this case, the relationship between the strip thickness deviation Δh on the delivery side of the rolling mill and the rolling load fluctuation amount ΔP is represented by the following equation (3).

Therefore, the load mode roll eccentricity calculation unit 13 calculates the roll eccentricity amount ΔS _REC2 (ΔP) in the load mode as follows when the rolling load variation amount ΔP is applied to the material 1 to be rolled. It is calculated by the equation (4).

Therefore, the total ΔS _REC (Δh, ΔP) of the roll eccentricity ΔS _REC2 (ΔP) in the load mode and the roll eccentricity ΔS _REC (Δh) in the plate thickness mode can be obtained by the following equation (5). it can.

The formula (5) is such that the roll eccentricity amount ΔS _REC2 (ΔP) in the load mode based on the rolling load fluctuation amount ΔP and the roll eccentricity amount ΔS _REC (Δh) in the plate thickness mode based on the plate thickness deviation Δh cancel each other out. It means zero. In other words, the expression (5) means that it is possible to extract only the roll eccentricity amount in which the influence of the disturbance other than the roll eccentricity is canceled. This will be further described with reference to FIGS. 2 and 3.

FIG. 2A is a diagram showing an example of a rolling load fluctuation amount ΔP and a plate thickness deviation Δh caused by roll eccentricity, FIG. 2B is a diagram showing an example of a calculated value of the roll eccentricity, and FIG. 7C is a diagram showing an example of the detected value of the roll eccentricity amount. As shown in FIG. 2A, when the rolling load fluctuation amount ΔP swings to the plus side due to roll eccentricity, the plate thickness deviation Δh swings to the minus side. When the rolling load fluctuation amount ΔP swings to the negative side, the plate thickness deviation Δh swings to the positive side. That is, the rolling load fluctuation amount ΔP and the plate thickness deviation Δh have their phases reversed from each other.

As a result, the load mode roll eccentricity amount ΔS _REC2 (ΔP) calculated by the formula (4) and the plate thickness mode roll eccentricity amount ΔS _REC (Δh) calculated by the formula (2) are shown in FIG. As shown in (b), they have the same phase. Therefore, the detected value of the roll eccentricity amount is the sum of ΔS _REC2 (ΔP) and ΔS _REC (Δh), as shown in FIG. 2C.

FIG. 3 shows (a) an example of the rolling load fluctuation amount ΔP and plate thickness deviation Δh caused by a disturbance other than the roll eccentricity, (b) an example of a calculated value of the roll eccentricity, and (c) a roll eccentricity amount. It is a figure showing an example of a detected value. In the case of disturbances other than roll eccentricity, the rolling load fluctuation amount ΔP is mainly caused by the plate thickness deviation Δh, so the phase of the load fluctuation ΔP and the phase of the plate thickness deviation Δh are as shown in FIG. In addition, they have the same phase as each other.

As a result, the roll mode eccentricity amount ΔS _REC2 (ΔP) in the load mode and the roll eccentricity amount ΔS _REC (Δh) in the plate thickness mode calculated by the equation (4) are as shown in FIG. The phases are opposite to each other. Therefore, the detected value of the roll eccentricity is a sum of these, that is, zero as shown in FIG.

<Roll eccentricity transfer processing unit 20, 21, 30, 31>
By the way, the rolling load fluctuation amount ΔP can be detected by the rolling load detector 9 immediately below the rolling mill without delay time. On the other hand, the strip thickness deviation Δh is detected by the delivery side strip thickness detector 10 provided at a position distant from the rolling mill 150, so that dead time is generated. Therefore, when calculating the above formulas (2) and (4), it is necessary to align the phases of the rolling load fluctuation amount ΔP and the plate thickness deviation Δh with reference to the respective rotation angles of the backup rolls 2 and 3. There is.

In the present embodiment, the roll eccentricity amount transfer processing unit 20 in the load mode stores a roll eccentricity amount ΔS _REC2 (ΔP) in the load mode for one rotation of the backup roll 2 in a first tracking table (not shown). have.

Then, the roll eccentricity transfer processing unit 20 in the load mode detects the rotation angle of the backup roll 2 via the backup roll rotation detector 11 and the roll eccentricity amount calculation unit 13 in the load mode. The core amount ΔS _REC2 (ΔP) is calculated. Then, the calculated roll eccentricity amount ΔS _REC2 (ΔP) in the load mode is stored in the first tracking table in association with the detected rotation angle. In this way, the first tracking table stores the roll eccentricity amount ΔS _REC2 (ΔP) in the load mode in which the rotation angle of the backup roll 2 is, for example, every 360°.

The roll eccentricity amount transfer processing unit 21 in the plate thickness mode has a second tracking table (not shown) having the same configuration as the first tracking table. In the second tracking table, the roll eccentricity amount ΔS _REC (Δh) in the plate thickness mode for each 360° rotation angle of the backup roll 2 is stored.

Further, the roll eccentricity amount transfer processing unit 20 in the plate thickness mode obtains a rotation angle at which the backup roll 2 rotates while the material 1 to be rolled moves from immediately below the rolling mill to the position of the exit side plate thickness detector 10. Then, the obtained rotation angle is used as a phase difference between the roll eccentricity amount ΔS _REC2 (ΔP) in the load mode and the roll eccentricity amount ΔS _REC (Δh) in the plate thickness mode. As a result, the roll eccentricity ΔS _REC (Δh) in the plate thickness mode is the same as the roll eccentricity ΔS _REC2 (ΔP) in the load mode obtained immediately below the rolling mill for the data of one rotation before the backup roll 2. It is possible to align the phases.

The roll eccentricity amount transfer processing unit 30 in the load mode has a third tracking table (not shown) that stores the roll eccentricity amount ΔS _REC2 (ΔP) in the load mode for one rotation of the backup roll 3. .. The roll eccentricity amount transfer processing unit 31 in the plate thickness mode also has a fourth tracking table (not shown) that stores the roll eccentricity amount ΔS _REC (Δh) in the load mode for one rotation of the backup roll 3. is doing.

Then, in the same manner as described above, the roll eccentricity amount ΔS _REC (Δh) and the load mode in the plate thickness mode stored in the third and fourth tracking tables for the data for one rotation of the backup roll 3 are stored. Of the roll eccentricity amount ΔS _REC2 (ΔP).

The roll eccentricity amount ΔS _REC (Δh) in the plate thickness mode and the load mode roll eccentricity amount ΔS _REC2 (ΔP) for each of the backup rolls 2 and 3 whose phases are aligned as described above are the roll eccentricity amount. It is output to the learning units 22 and 32.

<Roll eccentricity learning unit 22, 32>
FIG. 4 is a diagram showing an example of a detailed configuration of the roll eccentricity learning unit 22 that learns the roll eccentricity of the backup roll 2. Since the roll eccentricity learning unit 32 for the roll eccentricity of the backup roll 3 has the same configuration, only the roll eccentricity learning unit 22 for the roll eccentricity of the backup roll 2 will be described below. To do.

The roll eccentricity learning unit 22 is provided with a roll eccentricity learning table 23 that stores the roll eccentricity learning value learned by the roll eccentricity learning unit 22. The roll eccentricity amount learning unit 22 obtains from the roll eccentricity amount learning table 23 and the roll eccentricity amounts ΔS _REC2 (ΔP) and ΔS _REC (Δh) obtained from the roll eccentricity amount transfer processing units 20 and 21, respectively. A new roll eccentricity learning value is calculated based on the previous roll eccentricity learning value.

That is, as shown in FIG. 4, the load mode roll eccentricity learning value calculation unit 222 multiplies the load mode roll eccentricity amount ΔS _REC2 (ΔP) by the learning gain G _1P to obtain the load mode roll eccentricity. Get the core learning value. The roll eccentricity learning value calculation unit 223 in the plate thickness mode multiplies the roll eccentricity amount ΔS _REC (Δh) in the plate thickness mode by the learning gain G _1h to obtain the roll eccentricity learning value in the plate thickness mode. obtain.

The roll eccentricity amount filtering processing unit 221 uses the roll eccentricity learning value stored in the roll eccentricity learning table 23 and the roll eccentricity values stored before and after the roll eccentricity learning value. A predetermined weighted moving average value is obtained from the core learning value. Then, the roll eccentricity amount learning value calculation unit 224 multiplies the weighted moving average value obtained by the roll eccentricity amount filtering processing unit 221 by a predetermined learning coefficient G ₂ to obtain the previous roll eccentricity amount learning value. obtain.

The roll eccentricity amount learning table value calculation unit 225 includes a roll eccentricity amount learning value calculation unit 224 for the load eccentricity amount learning value calculation units 222 and 223 for the load mode and the plate thickness mode. The previous roll eccentricity amount learning value calculated in step 3 is added to calculate the current roll eccentricity amount learning value. Further, the roll eccentricity amount learning table value calculation unit 225 updates the roll eccentricity amount learning table 23 with the calculated current roll eccentricity amount learning value.

Therefore, in the content of the roll eccentricity amount learning table 23 described above, the roll eccentricity amount learning value corresponding to the angular rotation angle is updated once each time the backup roll 2 rotates once.

The roll eccentricity learning unit 22 in FIG. 4 functions as a digital filter that extracts signals of the rotation frequency of the backup roll 2 and a frequency N times that of the rotation frequency. At that time, the learning gains G _1P , G _1h , and G ₂ are parameters of the digital filter for learning the roll eccentricity amount, and the control gain K _p of the roll eccentricity control system by this digital filter is as follows. It is represented by (6).

Here, when the values of the learning gains G _1P , G _1h , and G ₂ are changed, the characteristics of this digital filter change. For example, if G _1P =0.1, G _1P =0.1, and G ₂ =0.9, then K _p =2, and the gain is proportional to twice. When G _1P =0.1, G _1P =0.1, and G ₂ =0.99, K _p =20 and the gain is 20 times proportional control. At this time, the residual plate thickness deviation due to the influence of roll eccentricity becomes 1/(K _p +1)=1/21, which can theoretically be suppressed to 5% or less. Further, when G ₂ =1.0 is set, integral control is performed, and theoretically, the plate thickness deviation due to the influence of roll eccentricity becomes zero. When G ₂ exceeds 1.0, it diverges.

Since the eccentricity of the backup roll 2 changes during rolling, the learning gain G ₂ is 0.9 or more and less than 1.0 in consideration of the forgetting factor of the roll eccentricity learning table 23. It is better to set to.

<Roll eccentricity control output calculation units 24 and 34, roll eccentricity control output unit 40>
The roll eccentricity control output calculating unit 24 of the backup roll 2 considers the transmission delay of the data from the roll eccentricity amount learning table 23 of the backup roll 2 and takes into account the roll deviation corresponding to the rotation angle just below the rolling mill. Read the core amount learning value. Then, the read roll eccentricity amount learning value is output to the roll eccentricity control output unit 40 as the roll eccentricity amount S _RECTOP of the backup roll 2.

Similarly, the roll eccentricity control output calculation unit 34 of the backup roll 3 considers the transmission delay of the data from the roll eccentricity amount learning table 33 of the backup roll 3 and corresponds to the rotation angle just before the rolling mill. Read the roll eccentricity amount learning value. Then, the read roll eccentricity amount learning value is output to the roll eccentricity control output unit 40 as the roll eccentricity amount S _RECBOT of the backup roll 3.

The roll eccentricity control output unit 40 _adds the roll eccentricity amount S _RECTOP of the backup roll 2 and the roll eccentricity amount S _RECBOT of the backup roll 3 and _uses the added value as the roll eccentricity control command S _REC. Output to the control device 8. At this time, pressing position control device 8, based on the roll eccentricity control command S _REC, changing the pressing position as canceled the effect of the roll eccentricity of the backup rolls 2 and 3.

<Effects of this embodiment>
As described above, in the present embodiment, the roll eccentricity learning units 22 and 32 add the roll eccentricity ΔS _REC2 (ΔP) in the load mode and the roll eccentricity ΔS _REC (Δh) in the plate thickness mode, and then add the roll eccentricity. , Learning processing is performed every time the backup rolls 2 and 3 rotate once. The learning process has a filter function, and the processing result is obtained for each predetermined rotation angle increment (for example, once) of the backup rolls 2, 3. Therefore, in the rolling control device 100 according to the present embodiment, it becomes possible to extract a roll eccentricity amount that is multiple times (N times) the rotation frequency of the backup rolls 2 and 3.

Further, the rolling control device 100 according to the present embodiment can extract the roll eccentricity amounts S _RECTOP and S _RECBOT from which the influence of various disturbances has been removed for each of the backup rolls 2 and 3. Therefore, the rolling control device 100 can eliminate the influence of the roll eccentricity amount by _issuing a roll eccentricity control command S _REC corresponding to the roll eccentricity amounts S _RECTOP and S _RECBOT to the rolling position control device 8. it can. Therefore, in the present embodiment, it is possible to accurately suppress the plate thickness variation due to roll eccentricity.

<<Second Embodiment>>
FIG. 5: is the figure which showed the example of the roll eccentricity control structure in the rolling control apparatus 100a which concerns on the 2nd Embodiment of this invention, and the structural example of the rolling mill 150a which is the control object. The rolling control device 100 according to the first embodiment (see FIG. 1) does not consider the influence of the plate thickness control on the roll eccentricity control, but the second embodiment considers the influence of the plate thickness control. An example of the roll eccentricity control system will be described. It should be noted that the plate thickness control referred to here is a control for keeping the plate thickness which is changed by disturbance other than the roll eccentricity constant.

As shown in FIG. 5, the configuration of the rolling control device 100a according to the second embodiment is a configuration in which an inlet side plate thickness detector 15 and a plate thickness control unit 16 are added to the configuration of the rolling control device 100 of FIG. Becomes However, the entrance side plate thickness detector 15 may be omitted.

The strip thickness control unit 16 obtains a strip thickness desired for the rolling mill 150a, which is obtained from the strip thickness deviation ΔH and the strip thickness deviation Δh detected by the strip thickness detector 15 and the strip thickness detector 10. A reduction position command ΔS _AGC that gives a target thickness value is output to the reduction position control device 8. This rolling position command ΔS _AGC has no relation to the roll eccentricity, and therefore becomes a disturbance to the roll eccentricity control system in the case of the first embodiment.

Here, assuming that the outlet plate thickness of the rolling mill 150a is constant, the rolling load change amount ΔP _AGC caused by the rolling position command ΔS _AGC from the plate thickness control unit 16 is calculated by the following equation (7). It

Therefore, if the load fluctuation ΔP _REC used for roll eccentricity control is corrected by the rolling load change amount ΔP _AGC due to the rolling position command ΔS _AGC , the influence of the plate thickness control can be eliminated. That is, the load variation ΔP _REC used for roll eccentricity control can be calculated by the following equation (8).

Therefore, in the present embodiment, the roll eccentricity control similar to that in the case of the first embodiment can be performed by using the load variation ΔP _REC for roll eccentricity control of Expression (8). Therefore, also in this embodiment, the same effect as that of the first embodiment can be obtained.

The present invention is not limited to the embodiment and the modified examples described above, and further includes various modified examples. For example, the above-described embodiments and modified examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Further, it is possible to replace a part of the configuration of a certain embodiment or a modified example with the configuration of another embodiment or a modified example, and the configuration of a certain embodiment or a modified example may be changed to another embodiment or a modified example. It is also possible to add the configuration of. Further, it is possible to add, delete, or replace a part of the configuration of each embodiment or the modification with the configuration included in the other embodiment or the modification.

1 Rolled material 2,3 Backup roll 4,5 Intermediate roll 6,7 Work roll 8 Rolling position control device 9 Rolling load detector 10 Outgoing plate thickness detector 11,12 Backup roll rotation detector 13 Roll eccentricity in load mode Quantity calculator (first roll eccentricity calculator)
14 Roll eccentricity amount calculation unit in plate thickness mode (second roll eccentricity amount calculation unit)
15 Inlet plate thickness detector 16 Plate thickness control unit 20, 21, 30, 31 Roll eccentricity transfer processing unit 22, 32 Roll eccentricity learning unit 23, 33 Roll eccentricity learning table 24 Upper roll eccentricity control output Calculator 34 Lower roll eccentricity control output calculator 221 Roll eccentricity amount filtering processor 222 Load mode roll eccentricity learning value calculator 223 Sheet thickness mode roll eccentricity learning value calculator 224 Roll eccentricity learning Value calculation unit 225 Roll eccentricity learning table Value calculation unit 40 Roll eccentricity control output unit 100, 100a Rolling control device 150 Rolling mill ΔP Rolling load variation (rolling load variation)
Δh Output side plate thickness deviation (plate thickness fluctuation)
ΔH Entry thickness deviation ΔS _REC2 (ΔP) Roll eccentricity in load mode (first roll eccentricity)
ΔS _REC (Δh) Roll eccentricity in plate thickness mode (second roll eccentricity)
S _RECTOP Upper backup roll roll eccentricity S _RECBOT Lower backup roll roll eccentricity S _REC Roll eccentricity control command ΔS _AGC Rolling position command from plate thickness control unit ΔP _AGC Rolling caused by rolling position command from plate thickness control unit Amount of change in load

Claims (6)

A rolling control device for controlling a rolling mill having a rolling roll for rolling a material to be rolled,
A first roll eccentricity calculation unit that calculates a first roll eccentricity of the rolling roll, based on a variation amount of a rolling load that the rolled material receives from the rolling roll;
A second roll eccentricity calculation unit that calculates a second roll eccentricity of the rolling roll based on a sheet thickness deviation of the material to be rolled from the rolling mill,
The first roll eccentricity amount and the first roll eccentricity amount respectively calculated by the first roll eccentricity amount calculation unit and the second roll eccentricity amount calculation unit for each predetermined rotation angle increment of the rolling roll. A roll eccentricity learning unit that learns a roll eccentricity amount obtained by adding the roll eccentricity amount of 2 every time the rolling roll makes one revolution,
A roll eccentricity control output unit that outputs the roll eccentricity amount learned by the roll eccentricity learning unit to a reduction position control device that controls the reduction position of the rolling roll,
A rolling control device comprising: Phase matching between the first roll eccentricity amount calculated by the first roll eccentricity amount calculation unit and the second roll eccentricity amount calculated by the second roll eccentricity amount calculation unit, It further comprises a roll eccentricity transfer processing unit that outputs the first roll eccentricity amount and the second roll eccentricity amount after the phase adjustment to the roll eccentricity amount learning unit. The rolling control device according to claim 1. Further comprising a plate thickness control unit for outputting a rolling position control command for controlling the plate thickness on the exit side of the rolling material from the rolling mill to a preset target plate thickness,
The first roll eccentricity amount calculation unit,
The fluctuation amount of the rolling load used for the calculation of the first roll eccentricity is corrected by using the fluctuation amount of the rolling load generated by the rolling position control command output from the strip thickness control unit. The rolling control device according to claim 1. A rolling control method by a rolling control device for controlling a rolling mill that rolls a material to be rolled with a rolling roll,
The rolling control device,
A first step of calculating a first roll eccentric amount of the rolling roll based on a variation amount of a rolling load that the rolled material receives from the rolling roll;
A second step of calculating a second roll eccentricity of the rolling roll based on a deviation of the strip thickness of the material to be rolled from the rolling mill;
The first roll eccentricity amount and the second roll eccentricity amount, which are respectively calculated in the first step and the second step, are added together for each predetermined rotation angle increment of the rolling roll. A third step of learning the roll eccentricity each time the rolling roll makes one revolution,
A fourth step part for outputting the roll eccentricity learned in the third step to a rolling position control device for controlling the rolling position of the rolling roll;
A rolling control method characterized by executing. The rolling control device,
The first roll eccentricity amount calculated in the first step and the second roll eccentricity amount calculated in the second step are phase-matched, and the first phase-aligned first The fifth step of transferring the roll eccentricity amount and the second roll eccentricity amount to the third step before performing the third step is further performed. 4. The rolling control method described in 4. The rolling control device,
Before executing the first step, the sixth step of calculating a rolling position control command for controlling the plate thickness of the rolled material on the exit side from the rolling mill to a preset target plate thickness Run and
In the first step,
The fluctuation amount of the rolling load used for the calculation of the first roll eccentricity is corrected by using the fluctuation amount of the rolling load generated by the rolling position control command calculated in the sixth step. The rolling control method according to claim 4.

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