WO2023037409A1

WO2023037409A1 - Leveling control device, rolling equipment provided with same, and leveling control method

Info

Publication number: WO2023037409A1
Application number: PCT/JP2021/032839
Authority: WO
Inventors: 秀昭古元; 喜美影平
Original assignee: ＰｒｉｍｅｔａｌｓＴｅｃｈｎｏｌｏｇｉｅｓＪａｐａｎ株式会社
Priority date: 2021-09-07
Filing date: 2021-09-07
Publication date: 2023-03-16
Also published as: JPWO2023037409A1

Abstract

A leveling control device 150 comprises: a torque acquisition unit 161 that finds, from torque measured by each of shape meters 91, 92, 93, 94, 95, 96 which are provided among a plurality of rolling stands, a torque distribution applied in the width direction of a steel sheet 1, such torque distribution being that among each of the plurality of rolling stands; a primary component computation unit 162 that obtains a tension distribution in the width direction from the obtained torque distribution and that obtains a primary component for a case in which a tension distribution of the steel sheet 1 is expressed as a polynomial from the tension distribution; a leveling correction amount computation unit 163 that obtains, on the basis of the obtained primary component, a leveling correction amount of a rolling stand, of the plurality of rolling stands, immediately before a rolling upstream side; and a leveling amount change unit 164 that changes, on the basis of the obtained leveling correction amount, a leveling amount in order from the (final -1)st stand of the plurality of rolling stands toward the rolling upstream side.

Description

LEVELING CONTROL DEVICE, ROLLING FACTORY INCLUDING THE SAME, AND LEVELING CONTROL METHOD

The present invention relates to a leveling control device, a rolling facility equipped with the same, and a leveling control method.

Strip bending in a tandem mill to provide an overall coordinated control of the tandem mill which reliably prevents the occurrence of strip bending throughout the mill as well as at the exit side of the final mill stand. As an example of a control method, Patent Document 1 discloses that a strip is sequentially passed through a plurality of rolling mill stands arranged in series, and the strip is simultaneously rolled at each rolling mill stand. A method of controlling plate bending in a tandem mill that adjusts the amount of lateral reduction of each rolling mill stand based on the detected value of the tension deviation to remove the lateral tension deviation of the strip between each rolling mill stand, thereby controlling plate bending , adjustment of the reduction amount of the rolling mill stand is performed on the front side of the detection position based on the detected value of the lateral tension deviation of the strip coming out of the rolling mill stand, and this adjustment operation is sequentially performed toward the rolling mill stand on the entry side. It is stated that it will proceed.

Japanese Patent Publication No. 63-29605

It is well known that in a rolling facility with a high rolling speed, a large amount of bending occurs in the strip due to the difference in the amount of reduction on the left and right of the rolling mill or the difference in the thickness of the material on the left and right. If such plate bending occurs, the quality of the product will be impaired. Therefore, there is a strong demand for the development of a control method that prevents the occurrence of such plate bending.

As a method for preventing board bending, there is a method described in Patent Document 1, for example. Patent Document 1 discloses that, based on the left and right tension deviation of the strip between each rolling mill stand, roll-down control is performed at the stand on the front side of the tension detection position, and this control is sequentially advanced to the entry side.

However, since the allowable tension deviation differs depending on the strip width, and the tension deviation includes measurement errors, if the measured tension deviation is used as it is for reduction control, there is a risk that the accuracy will decrease. It became clear that there was room.

The present invention provides a leveling control device that can improve the accuracy of roll reduction control of each stand of a hot rolling line in which a plurality of rolling stands are arranged compared to the conventional one, rolling equipment equipped with the same, and leveling control provide a way.

The present invention includes a plurality of means for solving the above problems. One example is a leveling control device for a hot rolling line in which a plurality of rolling stands are arranged, wherein the leveling control device between the plurality of rolling stands From the results measured by each shape meter provided in, a torque acquisition unit that obtains the torque distribution applied in the width direction of the steel plate between each of the plurality of rolling stands, and the width direction from the obtained torque distribution a primary component calculation unit that obtains a tension distribution and obtains a primary component when the tension distribution of the steel sheet is represented by a polynomial from the tension distribution; and based on the obtained primary component, the plurality of rolling stands. A leveling correction amount calculation unit that obtains the leveling correction amount of the rolling stand immediately before the upstream side of the rolling, and based on the obtained leveling correction amount, the stand of the (last -1) stage among the plurality of rolling stands and a leveling amount changing unit that changes the leveling amount in order from the upstream side of the rolling.

　According to the present invention, it is possible to improve the accuracy of the reduction control of each stand of a hot rolling line in which a plurality of rolling stands are arranged, compared to the conventional one. Problems, configurations and effects other than those described above will be clarified by the following description of the embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic which shows the structure of the rolling equipment provided with the leveling control apparatus of Example 1 of this invention. FIG. 5 is a diagram showing an example of a determination method within the allowable range of the primary component in the leveling control device of the first embodiment; 4 is a flowchart showing an example of the flow of leveling amount correction control in the leveling control device of the first embodiment; Schematic which shows the structure of the rolling equipment provided with the leveling control apparatus of Example 2 of this invention. 9 is a flow chart showing an example of the flow of leveling amount correction control in the leveling control device of the second embodiment. Schematic which shows the structure of the rolling equipment provided with the leveling control apparatus of Example 3 of this invention. 10 is a flow chart showing an example of the flow of leveling amount correction control in the leveling control device of the third embodiment.

Embodiments of the leveling control device of the present invention, a rolling facility equipped with the same, and a leveling control method will be described below with reference to the drawings.

In addition, in the drawings used in this specification, the same or corresponding constituent elements may be denoted by the same or similar reference numerals, and repeated description of these constituent elements may be omitted.

In addition, the material to be rolled in the present invention is not limited to a steel plate, but can be a strip of a metal material that can be rolled in general, and the type is not particularly limited. Non-ferrous materials can be targeted.

<Example 1>
Embodiment 1 of the leveling control device of the present invention, a rolling mill equipped with the same, and a leveling control method will be described with reference to FIGS. 1 to 3. FIG.

First, the overall configuration of the rolling equipment, including the leveling control device, will be explained using FIG. FIG. 1 is a schematic diagram showing the structure of a rolling facility equipped with a leveling control device according to the first embodiment.

A rolling facility 200 shown in FIG. 1 is a finish rolling facility for rolling a steel plate 1, and includes an F1 stand 10, an F2 stand 20, an F3 stand 30, an F4 stand 40, an F5 stand 50, an F6 stand 60, and an F7 stand 70. ,

cameras

81, 82, 83, 84, 85, 86,

shape meters

91, 92, 93, 94, 95, 96, 97, a leveling control device 150, and the like.

It should be noted that the rolling facility 200 is not limited to the configuration in which seven rolling stands are provided as shown in FIG. 1, and may have at least three stands.

Each of the F1 stand 10, the F2 stand 20, the F3 stand 30, the F4 stand 40, the F5 stand 50, the F6 stand 60, and the F7 stand 70 has an upper work roll and a lower work roll, and the upper work roll and the lower work roll, respectively. An upper backup roll supported by contact, a lower backup roll, a screw down

device

11, 21, 31, 41, 51, 61, 71 provided on the upper part of the upper backup roll,

load detectors

12, 22, 32, 42, It is a rolling mill with 52,62,72. Information on the rolling load measured by the

load detectors

12 , 22 , 32 , 42 , 52 , 62 , 72 is transmitted to the leveling controller 150 via the communication line 110 .

It should be noted that a six-stage configuration may be employed in which upper and lower intermediate rolls are further provided between each of the upper and lower work rolls and each of the upper and lower backup rolls. The roll configuration of the rolling mill is not limited to the form described above, and it is sufficient that there are at least upper and lower work rolls.

Shape meters

91, 92, 93, 94, 95, and 96 are provided between F1 stand 10, F2 stand 20, F3 stand 30, F4 stand 40, F5 stand 50, F6 stand 60, and F7 stand 70, respectively. , is a measuring instrument for measuring the torque of the steel plate 1 . Moreover, the tension distribution in the width direction of the sheet can be detected, and the position of the steel sheet 1 can also be detected.

Information on the surface shape of the steel plate 1 at the F1 stand 10 exit side (F2 stand 20 entry side) measured by the shape meter 91 is transmitted to the leveling control device 150 via the communication line 110 . Information on the surface shape of the steel plate 1 at the exit side of the F2 stand 20 (the entrance side of the F3 stand 30) measured by the shape meter 92 is transmitted to the leveling control device 150 via the communication line 110 . Information on the surface shape of the steel plate 1 at the F3 stand 30 exit side (F4 stand 40 entry side) measured by the shape meter 93 is transmitted to the leveling control device 150 via the communication line 110 . Information on the surface shape of the steel plate 1 at the F4 stand 40 exit side (F5 stand 50 entry side) measured by the shape meter 94 is transmitted to the leveling control device 150 via the communication line 110 . Information on the surface shape of the steel plate 1 at the F5 stand 50 exit side (F6 stand 60 entry side) measured by the shape meter 95 is transmitted to the leveling control device 150 via the communication line 110 . Information on the surface shape of the steel plate 1 at the exit side of the F6 stand 60 (the entrance side of the F7 stand 70) measured by the shape meter 96 is transmitted to the leveling control device 150 via the communication line 110 .

The shape meter 97 is also a measuring instrument for measuring the surface shape of the steel plate 1, like the shape meter 91 and the like, and is provided on the exit side of the F7 stand 70. Information on the surface shape of the steel plate 1 on the delivery side of the F7 stand 70 measured by the shape meter 97 is transmitted to the leveling control device 150 via the communication line 110 .

The camera 81 is provided at a position capable of capturing an image including the steel plate 1 on the exit side of the F1 stand 10 and the entry side of the F2 stand 20. The camera 82 is provided at a position capable of capturing an image including the steel plate 1 on the exit side of the F2 stand 20 and the entrance side of the F3 stand 30 . The camera 83 is provided at a position capable of capturing an image including the steel plate 1 on the exit side of the F3 stand 30 and the entrance side of the F4 stand 40 . The camera 84 is provided at a position capable of capturing an image including the steel plate 1 on the exit side of the F4 stand 40 and the entrance side of the F5 stand 50 . The camera 85 is provided at a position capable of capturing an image including the steel plate 1 on the exit side of the F5 stand 50 and the entry side of the F6 stand 60 . The camera 86 is provided at a position capable of capturing an image including the steel plate 1 on the delivery side of the F6 stand 60 and the entry side of the F7 stand 70 .

These

cameras

81 , 82 , 83 , 84 , 85 , 86 capture images including the steel plate 1 directly above or obliquely above the steel plate 1 at intervals of, for example, less than 0.1 seconds, preferably in the form of moving images. The data of the captured image is transmitted to the leveling control device 150 via the communication line 110 .

The leveling control device 150 is a device configured by a computer or the like that controls the operation of each device in the rolling mill 200, and includes a torque acquisition unit 161, a primary component calculation unit 162, a leveling correction amount calculation unit 163, and a leveling amount change. It has a section 164, a meandering amount calculation section 165, a storage section 166, and the like.

The torque acquisition unit 161 is provided between the F1 stand 10, the F2 stand 20, the F3 stand 30, the F4 stand 40, the F5 stand 50, the F6 stand 60, and the F7 stand 70. From the torque measured by 95, 96, the torque distribution across the width of the steel plate 1 between each of the F1 stand 10, F2 stand 20, F3 stand 30, F4 stand 40, F5 stand 50, F6 stand 60, F7 stand 70 Ask for This torque acquisition unit 161 preferably serves as an execution subject of the torque acquisition process.

In addition, the torque acquisition unit 161 applies the torque of the steel sheet 1 in the width direction of the steel sheet 1 on the downstream side of the rolling of the F7 stand 70 from the torque of the steel sheet 1 acquired by the shape meter 97 provided on the rolling downstream side of the final F7 stand 70. Find the torque distribution.

The meandering amount calculation unit 165 calculates the results measured by the plate position detectors provided between the F1 stand 10, F2 stand 20, F3 stand 30, F4 stand 40, F5 stand 50, F6 stand 60, and F7 stand 70. , the amount of deviation between the center of the width direction of the steel sheet 1 and the center of rolling between each of the F1 stand 10, F2 stand 20, F3 stand 30, F4 stand 40, F5 stand 50, F6 stand 60, and F7 stand is obtained.

The plate position detectors that acquire the measurement results used by the meandering amount calculation unit 165 are the

cameras

81, 82, 83, 84, 85, and 86 described above, or the

shape meters

91, 92, 93, 94, 95, 96, and 97. is.

The first-order component calculation unit 162 obtains the tension distribution in the width direction of the steel plate 1 from the torque distribution obtained by the torque obtaining unit 161 . Also, from the obtained tension distribution, a primary component is obtained when the tension distribution of the steel sheet 1 is represented by a polynomial. At this time, the first-order component calculation section 162 can correct the torque distribution in the width direction of the steel sheet 1 based on the deviation amount (the meandering amount ΔYc in FIG. 2) obtained by the meandering amount calculating section 165 . The first-order component calculation unit 162 preferably serves as the execution body of the first-order component calculation process.

The leveling correction amount calculation unit 163 obtains the leveling correction amounts of the rolling stands 10, 20, 30, 40, 50, and 60 immediately before the rolling upstream side based on the primary components obtained by the primary component calculation unit 162. Moreover, it is desirable that the leveling correction amount calculation section 163 obtains the leveling correction amount of the F7 stand 70 based on the first-order component obtained in the first-order component calculation section 162 . This leveling correction amount calculation unit 163 preferably serves as the executing body of the leveling correction amount calculation step.

More specifically, the leveling correction amount calculation unit 163 uses the primary component of the tension distribution obtained from the torque of the steel plate 1 measured by the shape meter 96 provided on the delivery side of the F6 stand 60 to adjust the F6 stand. Makes 60 leveling modifiers. This processing is sequentially executed toward the upstream side of the rolling.

Here, if the leveling at each stand is changed, both the primary component on the entry side and exit side of each stand will change, so the amount of adjustment is determined using the primary component on the exit side of the final F7 stand 70. is desired. Therefore, it is desirable to correct the leveling of the F7 stand 70 using the primary component of the tension distribution obtained from the torque of the steel plate 1 measured by the shape meter 97 provided on the delivery side of the F7 stand 70 .

In addition, when the leveling is corrected on the upstream side, the effect is propagated to the downstream side. Therefore, it is desirable to feedback-control the leveling amount of each stand so that the plate wedge ratio is constant, that is, the first-order component becomes 0. .

Further, when the tail end (most plate end) of the steel plate 1 reaches the shape meter 94 on the entry side of the F5 stand 50, the shape meter 96 of the F7 stand 70 begins to descend vertically downward (from the steel plate 1 from this timing onwards, leveling correction of the F6 stand 60 and the F7 stand 70 is performed using the amount of meandering of the steel plate 1 input from the camera 85 in front of the F6 stand 60 and the camera 86 in front of the F7 stand 70. is desirable. More specifically, the off-center amount between the F5 stand 50 and the F6 stand 60 is used to correct the leveling of the F6 stand 60, and the off-center amount between the F6 stand 60 and the F7 stand 70 is used to correct the leveling of the F7 stand 70. is desirable.

Furthermore, if the tail end of the steel plate 1 passes below the camera 86 in front of the F7 stand 70, the amount of meandering cannot be measured.

Here, the leveling correction amount calculation unit 163 can obtain the leveling correction amount so that the obtained first-order component is within the allowable range.

FIG. 2 is a diagram showing an example of a method of determining within the allowable range of the primary component.

FIG. 2 shows the timing when the tail end of the steel plate 1 is pulled out of the F6 stand 60. Since the steel plate 1 is pulled out of the F6 stand 60, only the F7 stand 70 gives the left and right binding forces to the steel plate 1. There is a possibility that the steel plate 1 will meander greatly.

H is the average thickness of the steel plate 1 on the entry side of the F7 stand 70, ΔH is the difference in thickness between both ends of the steel plate 1 on the entry side, h is the average thickness of the steel plate 1 on the exit side of the F7 stand 70, and h is the exit side. Let Δh be the difference in thickness between both ends of the steel plate 1, and let ΔYc be the difference between the center of the F7 stand 70 in the width direction and the center of the steel plate 1 in the width direction, that is, the meandering amount of the steel plate 1, The amount of meandering .DELTA.Yc is obtained using the plate rotation angular velocity at the tail end and the plate speed moving in the width direction of the plate. Further, the plate rotation angular velocity and the plate speed are obtained using the plate wedge ratio change (Δh/h−ΔH/H). Furthermore, when the tension distribution of the steel plate 1 is represented by a polynomial, the first-order component (elongation difference ratio) is correlated with the plate wedge ratio change (Δh / h - ΔH / H), and the leveling amount (difference in reduction ratio) is also correlated with ΔH and Δh and can be calculated. Based on the results, the maximum value of the allowable meandering amount ΔYc (for example, the meandering amount ΔYc at the F7 stand 70 when the tail end of the steel plate 1 contacts the side guide (not shown)) is determined. It is also possible to calculate the degree of the primary component of the torque distribution applied in the width direction of the steel plate 1 on the exit side of the F7 stand 70 at the maximum possible meandering amount ΔYc.

Therefore, the leveling correction amount calculation unit 163 sets the range of the first order component of the torque distribution in which the amount of meandering ΔYc can be kept within the allowable range, and the first order component obtained by the first order component calculation unit 162 is set as the allowable range. A leveling correction amount can be obtained so as to be within the allowable range.

Based on the leveling correction amount obtained by the leveling correction amount calculating section 163, the leveling amount changing section 164 adjusts the F1 stand 10, the F2 stand 20, the F3 stand 30, the F4 stand 40, the F5 stand 50, the F6 stand 60, and the F7 stand. 70, the amount of leveling is changed in order from the (last-1) stand toward the upstream side of the rolling. Moreover, it is desirable that the leveling amount changing unit 164 also changes the leveling amount of the F7 stand 70 before changing the leveling amount of the (last-1) stage stand. The leveling amount changing unit 164 preferably serves as the executing body of the leveling amount changing process.

The leveling amount changing unit 164 outputs the obtained control parameter information of the leveling amount to each of the screw-down

devices

11, 21, 31, 41, 51, 61, and 71 via the communication line 120. , 21, 31, 41, 51, 61, and 71 operate to implement the input leveling amount.

The storage unit 166 is a computer storage device that constitutes the leveling control device 150, and is preferably configured with an SSD or HDD.

The control of the operation of each device by the leveling control device 150, the control of the operation of the torque acquisition unit 161, the primary component calculation unit 162, the leveling correction amount calculation unit 163, the leveling amount change unit 164, the meandering amount calculation unit 165, etc. It is executed based on various programs recorded in the storage unit 166 .

It should be noted that the control processing of the operations executed by the leveling control device 150 may be integrated into one program, may be separated into a plurality of programs, or may be a combination thereof. Also, part or all of the program may be realized by dedicated hardware, or may be modularized.

Next, the F1 stand 10, the F2 stand 20, the F3 stand 30, the F4 stand 40, the F5 stand 50, the F6 stand 60, and the F7 stand 70 are arranged, preferably performed by the leveling control device 150 according to the present embodiment. A leveling control method for the hot rolling line will be described with reference to FIG. FIG. 3 is a flow chart showing an example of the leveling amount correction control flow in the leveling control device of the first embodiment.

As shown in FIG. 3, first, the torque of the steel plate 1 on the delivery side of the F7 stand 70 (final stand) is measured by the shape meter 97, and the torque applied in the width direction of the steel plate 1 is measured by the torque acquisition unit 161 of the leveling control device 150. Along with determining the distribution, the primary component in the width direction of the steel sheet 1 is determined in the primary component calculator 162 (step S101).

Next, the leveling correction amount calculation unit 163 of the leveling control device 150 calculates the leveling correction amount of the F7 stand 70 in consideration of the primary component obtained in step S101, and the leveling amount change unit 164 changes the leveling amount. (Step S102).

After that, the primary component of the tension distribution of the steel plate 1 between the F6 stand 60 and the F7 stand 70 is obtained in the same manner as the F7 stand 70 (final stand) delivery side (step S103).

After that, the leveling correction amount calculation unit 163 calculates the leveling correction amount of the F6 stand 60 in consideration of the primary component obtained in step S103, and the leveling amount change unit 164 changes the leveling amount (step S104). .

The same processing as steps S101 and S102 or steps S103 and S104 is also executed for the F5 stand 50, F4 stand 40, F3 stand 30, F2 stand 20, and F1 stand 10 (steps S105, S106, S106 and S106, respectively). S107, S108, S109, S110, S111, S112, S113, S114 (corresponding to calculation of the leveling correction amount of F1 in consideration of the primary component, leveling change)).

Here, when the leveling is corrected on the upstream side, the effect is propagated to the downstream side, so the leveling correction amount of the F7 stand 70 is calculated with the plate wedge ratio constant for the leveling correction amount of the F6 stand 60 (step S121 ), it is desirable to reflect this in the processing in step S102.

The processing of this step S121 is the same for the F5 stand, etc., and the corrections of the F1 stand 10, F2 stand 20, F3 stand 30, F4 stand 40, F5 stand 50, and F6 stand 60 are fixed, and each stand is calculated (corresponding to steps S122, S123, S124, S125, and S126), and can be reflected in the processing in step S102 and the like.

In addition, in order to avoid a constant loop due to the above-described step S121, etc., the number of times step S121 is executed is recorded, and when a predetermined number of times is executed, the execution of steps S121, . . . , S126 is stopped. Alternatively, it is desirable to take measures such as stopping after a certain period of time has passed since the first execution, or stopping the execution of the process when the amount of correction in steps S121, . .

After that, it is determined whether or not the primary component of the tension distribution of the steel plate 1 on each exit side of all the stands satisfies the allowable value (step S130). Control parameter information of the obtained leveling amount is output to each screw down

device

11, 21, 31, 41, 51, 61, 71). On the other hand, when it is determined that even one of the stands does not meet the requirement, the process returns to step S101, and the process of obtaining the control parameter for the leveling amount is continued until all the stand exit sides satisfy the allowable value.

In addition, it is desirable to continuously perform the processing shown in FIG. 3 during rolling. That is, it is desirable to start the process again from the beginning after the completion of the process.

Among the steps described above, steps S101 and S103 correspond to the torque acquisition process and the primary component calculation process, and steps S102, S104, S114, and S126 correspond to the leveling correction amount calculation process and the leveling amount change process.

Next, the effects of this embodiment will be described.

The leveling control device 150 in the rolling facility 200 of the first embodiment of the present invention described above is provided between the F1 stand 10, the F2 stand 20, the F3 stand 30, the F4 stand 40, the F5 stand 50, the F6 stand 60, and the F7 stand 70. From the torque measured by each

shape meter

91, 92, 93, 94, 95, 96, each of F1 stand 10, F2 stand 20, F3 stand 30, F4 stand 40, F5 stand 50, F6 stand 60, F7 A torque acquisition unit 161 that obtains the torque distribution applied in the width direction of the steel plate 1 between the stands 70, and the tension distribution in the width direction is obtained from the obtained torque distribution, and the tension distribution of the steel plate 1 is represented by a polynomial from the tension distribution. A leveling correction amount for obtaining the leveling correction amount of the rolling stands 10, 20, 30, 40, 50, 60 immediately before the rolling upstream side based on the first-order component calculation unit 162 that obtains the first-order component and the obtained first-order component. A computing unit 163 and a leveling amount changing unit 164 for sequentially changing the leveling amount from the F6 stand 60 toward the upstream side of the rolling based on the obtained leveling correction amount.

As a result, it becomes possible to calculate an appropriate leveling amount that takes into consideration the type of width of the steel sheet 1 and the measurement error, and the accuracy of the reduction control can be improved compared to the conventional method.

In addition, since the leveling correction amount calculation unit 163 obtains the leveling correction amount so that the obtained first-order component is within the allowable range, the first-order component can be reduced and the plate wedge ratio becomes nearly constant. can be rolled while maintaining , and the meandering of the steel sheet 1 can be reduced, and more stable rolling can be achieved.

Furthermore, when the leveling is changed, the primary components on both the entry side and the exit side of each stand change, so the torque acquisition part 161 is acquired by the shape meter 97 provided on the downstream side of the rolling of the F7 stand 70. From the torque of the steel plate 1 obtained, the torque distribution applied in the width direction of the steel plate 1 on the downstream side of the rolling of the F7 stand 70 is obtained, and the leveling amount changing unit 164 changes the leveling amount of the F7 stand 70 before the (last-1) stage stand. By changing also, it is possible to further improve the accuracy of the reduction control.

In addition, since it is difficult to correctly measure the left and right tension deviation when the plate is displaced from the rolling center, the F1 stand 10, F2 stand 20, F3 stand 30, F4 stand 40, F5 stand 50, and F6 stand 60 , F7 stand 70, F1 stand 10, F2 stand 20, F3 stand 30, F4 stand 40, F5 stand 50, F6 stand 60, F7 stand A meandering amount calculation unit 165 is further provided for determining the amount of deviation between the center of the width direction of the steel sheet 1 and the rolling center between 70, and the first-order component calculation unit 162 calculates By correcting the torque distribution in the width direction, the torque difference can be corrected by the amount of deviation, and the primary component can be obtained with higher accuracy. Therefore, it is possible to further improve the accuracy of the reduction control.

<Example 2>
Embodiment 2 A leveling control apparatus, a rolling facility equipped with the same, and a leveling control method according to Embodiment 2 of the present invention will be described with reference to FIGS. 4 and 5. FIG. FIG. 4 is a schematic diagram showing the configuration of a rolling facility equipped with the leveling control device of the second embodiment, and FIG. 5 is a flow chart showing an example of the flow of leveling amount correction control.

The rolling facility 200A of the present embodiment shown in FIG. 4 measures the thickness distribution in the width direction of the steel sheet 1 instead of the shape meter 97 provided on the delivery side of the F7 stand 70 in the rolling facility 200 of the first embodiment described above. A plate wedge amount measuring device 98 is provided. Note that the plate wedge amount measuring device 98 may be a plate thickness meter or a profile meter as long as it is a measuring device capable of measuring data for calculating the plate wedge amount.

In addition to the leveling control device 150 of the first embodiment, the leveling control device 150A further includes a plate wedge amount acquisition section 167A.

The plate wedge amount acquisition unit 167A determines the plate wedge of the steel sheet 1 on the rolling downstream side of the F7 stand 70 from the plate thickness distribution in the width direction measured by the plate wedge amount measuring device 98 provided on the rolling downstream side of the F7 stand 70. ask for quantity.

Further, the leveling correction amount calculation unit 163A obtains the leveling correction amount of the F7 stand 70 based on the plate wedge amount obtained by the plate wedge amount obtaining unit 167A, and the leveling amount change unit 164A obtains the (final -1) level. It also changes the leveling amount of the F7 stand 70 before the stand.

In the rolling at the F7 stand 70 of the rolling facility 200A, the plate wedge transfer rate is considered to be almost 0, and the plate wedge (plate wedge ratio) before rolling is thought to be inherited as it is. After rolling, that is, from the measured value of the plate wedge on the delivery side of the F7 stand 70, the leveling correction amount of the F7 stand is calculated to adjust the oil column difference between the drive side and work side screw down devices 71.

Next, a leveling control method preferably executed by the leveling control device 150A according to this embodiment will be described with reference to FIG.

As shown in FIG. 5, first, the plate wedge of the steel plate 1 on the delivery side of the F7 stand 70 is measured by the plate wedge amount measuring device 98 and the plate wedge amount acquisition unit 167A of the leveling control device 150A (step S201).

Next, the leveling correction amount calculation unit 163A of the leveling control device 150A calculates the leveling correction amount of the F7 stand 70 in consideration of the plate wedge obtained in step S101, and the leveling amount changing unit 164 changes the leveling amount. (Step S202). A known method may be used to calculate the amount of leveling correction from the determined plate wedge.

The subsequent processing from step S203 to step S230 is the same as the processing from step S103 to step S130 in FIG. 3 described above, and details thereof will be omitted.

Other configurations and operations are substantially the same as those of the leveling control device, the rolling equipment equipped with the same, and the leveling control method of the first embodiment described above, and the details are omitted.

The leveling control device, the rolling equipment having the same, and the leveling control method of the second embodiment of the present invention are also substantially the same as the leveling control device, the rolling equipment having the same, and the leveling control method of the first embodiment. A similar effect can be obtained.

Further, the plate wedge amount to obtain the plate wedge amount of the steel sheet 1 on the rolling downstream side of the F7 stand 70 from the plate thickness distribution in the width direction measured by the plate wedge amount measuring device 98 provided on the rolling downstream side of the F7 stand 70. The leveling correction amount calculation unit 163A obtains the leveling correction amount of the F7 stand 70 based on the plate wedge amount obtained by the plate wedge amount obtaining unit 167A, and the leveling amount changing unit 164A obtains ( Final-1) By changing the leveling amount of the F7 stand 70 before the step stand, even if the shape data cannot be used on the delivery side of the F7 stand 70, the accuracy of the reduction control can be further improved.

<Example 3>
Embodiment 3 A leveling control apparatus, a rolling facility equipped with the same, and a leveling control method according to Embodiment 3 of the present invention will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is a schematic diagram showing the configuration of a rolling facility equipped with the leveling control device of the third embodiment, and FIG. 7 is a flow chart showing an example of the flow of correction control of the leveling amount.

The rolling facility 200B of the present embodiment shown in FIG. 6 does not have the shape meter 97 of the rolling facility 200 of the first embodiment or the plate wedge amount measuring device 98 of the rolling facility 200A of the second embodiment, and is the final stage. This is a form in which calculated values are assumed when the data of the plate wedge amount and tension distribution of the steel plate 1 on the delivery side of the F7 stand 70 are not obtained. Based on the rolling load and leveling amount from the rolling upstream side to the (last-1) stage stand of the stand 30, F4 stand 40, F5 stand 50, F6 stand 60, and F7 stand 70, the rolling upstream side of F7 stand 70 A plate wedge amount calculation unit 168B that obtains the plate wedge amount of the steel plate 1 is further provided.

Further, the leveling correction amount calculation unit 163B of the leveling control device 150B obtains the leveling correction amount of the F7 stand 70 based on the plate wedge amount obtained by the plate wedge amount calculation unit 168B, and the leveling amount change unit 164B calculates ( Last-1) The leveling amount of the F7 stand 70 is also changed before the number stand.

In a rolling facility with multiple stands, plate wedges are formed so as to substantially follow the leveling in the preceding F1 stand 10 and F2 stand 20, that is, transfer is dominant. On the other hand, the wedge (ratio) that enters the rolling stand also appears on the delivery side in order to avoid large deformation in the shape of the F3 stand 30 and subsequent stands, that is, heredity is dominant.

Therefore, based on this event, it is possible to estimate the plate wedge on the exit side of each stand. Therefore, once the plate wedge on the entry side of the F7 stand 70, which is the final stage, can be calculated, and if the leveling of the F7 stand 70 is changed based on the calculated plate wedge amount on the exit side of the F6 stand 60, An influence occurs on the upstream side, and the tension components of the

shape meters

91, 92, 93, 94, 95, 96 change. After that, as in the first and second embodiments, the leveling amount can be changed and controlled toward the upstream.

However, if the leveling is changed on the upstream side, it also affects the calculated value of the plate wedge on the entrance side of the F7 stand 70, so each stand should independently control the amount of leveling and calculate the plate wedge. For example, calculation of the plate wedge in steps S301 to S306 is always performed, and leveling change processing in steps S307 to S330 is performed between the start and end.

Next, a leveling control method preferably executed by the leveling control device 150B according to this embodiment will be described with reference to FIG.

As shown in FIG. 7, first, in the plate wedge amount calculation unit 168B of the leveling control device 150B, the delivery side of the F1 stand 10 is calculated using the actually measured rolling load P, the roll profile prediction value Cw, and the actually measured leveling ΔS at the F1 stand 10 . is calculated (step S301).

Next, in the plate wedge amount calculation unit 168B, the plate wedge calculation value on the delivery side of the F1 stand 10 obtained in the previous step S301, the measured rolling load P of the F2 stand 20, the roll profile prediction value Cw, and the measured leveling ΔS are used. A plate wedge on the delivery side of the F2 stand 20 is calculated (step S302).

The same processing as steps S301 and S302 is also executed for the F3 stand 30, F4 stand 40, F5 stand 50, and F6 stand 60 (corresponding to steps S303, S304, S305, and S306, respectively).

After that, as described above, since the transfer rate of the plate wedge is considered to be approximately 0 in the rolling at the F7 stand 70, in the leveling correction amount calculation unit 163B of the leveling control device 150B, a step corresponding to step S306 before rolling is performed. The leveling correction amount of the F7 stand 70 is calculated in consideration of the plate wedge (plate wedge ratio) on the delivery side of the F6 stand 60 calculated in 1, and the leveling amount is changed in the leveling amount changing unit 164B (step S307).

Subsequent step S308 and subsequent steps are basically the same as the processing from step S103 to step S130 in FIG. 3 described above, and the details are omitted. The difference is that when it is determined in step S330 that even one stand is not satisfied, the process returns to step S307, and the process of obtaining the control parameter for the leveling amount is continued until all stands are satisfied.

The leveling control device, the rolling equipment having the same, and the leveling control method of the third embodiment of the present invention are also substantially the same as the leveling control device, the rolling equipment having the same, and the leveling control method of the first embodiment. A similar effect can be obtained.

In addition, the rolling load and leveling amount from the upstream side of the rolling to the (final -1) stage stand among the F1 stand 10, F2 stand 20, F3 stand 30, F4 stand 40, F5 stand 50, F6 stand 60, and F7 stand 70 Based on this, a plate wedge amount calculation unit 168B that obtains the plate wedge amount of the steel plate 1 on the upstream side of the rolling of the F7 stand 70 is further provided. , and the leveling amount changing unit 164B also changes the leveling amount of the F7 stand 70 before the (last-1)th stand, thereby making various changes on the delivery side of the F7 stand 70. Even when such data cannot be used, the accuracy of the reduction control can be further improved.

<Others>
It should be noted that the present invention is not limited to the above examples, and includes various modifications. The above embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the described configurations.

It is also possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Moreover, it is also possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

Reference Signs List 1 Steel plate 10 F1 stand 11, 21, 31, 41, 51, 61, 71 Screw down

device

12, 22, 32, 42, 52, 62, 72 Load detector 20 F2 stand 30 F3 stand 40 F4 stand 50 F5 stand 60 F6 stand 70 F7 stand 81, 82, 83, 84, 85, 86

Cameras

91, 92, 93, 94, 95, 96, 97 Shape meter 98 Plate wedge

amount measuring device

110, 120...

Communication lines

150, 150A, 150B... Leveling control device 161... Torque acquisition unit 162... First-order

component calculation units

163, 163A, 163B... Leveling correction amount calculation units 164, 164A, 164B... Leveling amount change unit 165... Meandering amount calculation unit 166 Storage unit 167A Plate wedge amount acquisition unit 168B Plate wedge

amount calculation units

200, 200A, 200B Rolling equipment

Claims

A leveling control device for a hot rolling line in which a plurality of rolling stands are arranged,
a torque acquisition unit that obtains a torque distribution in the width direction of the steel sheet between each of the plurality of rolling stands from the torque measured by each shape meter provided between the plurality of rolling stands;
a primary component calculation unit that obtains the tension distribution in the width direction from the obtained torque distribution and obtains the primary component when the tension distribution of the steel sheet is represented by a polynomial from the tension distribution;
a leveling correction amount calculation unit that obtains the leveling correction amount of the rolling stand immediately upstream of the rolling among the plurality of rolling stands based on the obtained primary component;
a leveling amount changing unit that sequentially changes the leveling amount from the (last -1) stand of the plurality of rolling stands toward the upstream side of the rolling based on the obtained leveling correction amount. leveling control device.
The leveling control device according to claim 1,
The leveling control device, wherein the leveling correction amount calculation unit obtains the leveling correction amount so that the obtained first-order component is within an allowable range.
The leveling control device according to claim 1 or 2,
The torque acquisition unit applies the torque of the steel sheet in the width direction of the steel sheet on the downstream side of the rolling of the final stand from the torque of the steel sheet acquired by a shape meter provided on the downstream side of the rolling of the final stand among the plurality of rolling stands. Find the torque distribution,
The leveling control device, wherein the leveling amount changing unit also changes the leveling amount of the last stand before the (last-1) stage stand.
The leveling control device according to claim 1 or 2,
From the thickness distribution in the width direction measured by a plate wedge amount measuring device provided downstream of the final stand among the plurality of rolling stands, the plate wedge amount of the steel plate on the downstream side of the rolling of the final stand is calculated. further comprising a desired plate wedge amount acquisition unit,
The leveling correction amount calculation unit obtains the leveling correction amount of the final stand based on the plate wedge amount obtained by the plate wedge amount obtaining unit,
The leveling control device, wherein the leveling amount changing unit also changes the leveling amount of the last stand before the (last-1) stage stand.
The leveling control device according to claim 1 or 2,
A plate wedge amount calculation for obtaining a plate wedge amount of the steel plate on the rolling upstream side of the final stand based on the rolling load and the leveling amount from the rolling upstream side to the (last-1) stage stand among the plurality of rolling stands. further comprising the
The leveling correction amount calculation unit obtains the leveling correction amount of the final stand based on the plate wedge amount obtained by the plate wedge amount calculation unit,
The leveling control device, wherein the leveling amount changing unit also changes the leveling amount of the last stand before the (last-1) number stand.
In the leveling control device according to any one of claims 1 to 5,
A meandering amount for determining the amount of deviation between the width direction center of the steel sheet and the rolling center between each of the plurality of rolling stands from the results measured by each of the plate position detectors provided between the plurality of rolling stands. further comprising a calculation unit,
The leveling control device, wherein the primary component calculation section corrects the torque distribution in the width direction based on the deviation amount obtained by the meandering amount calculation section.
A leveling control device according to any one of claims 1 to 6;
a plurality of rolling stands for rolling the steel plate;
and a shape meter provided between each of the plurality of rolling stands.
A leveling control method for a hot rolling line in which a plurality of rolling stands are arranged,
a torque acquisition step of obtaining a torque distribution applied in the width direction of the steel plate between each of the plurality of rolling stands from the torque measured by each shape meter provided between the plurality of rolling stands;
A first order component calculation step of obtaining the tension distribution in the width direction from the obtained torque distribution and obtaining a first order component when the tension distribution of the steel sheet is represented by a polynomial from the tension distribution;
a leveling correction amount calculation step of obtaining the leveling correction amount of the rolling stand immediately upstream of the rolling among the plurality of rolling stands based on the obtained primary component;
and a leveling amount changing step of sequentially changing the leveling amount from the (last −1) stand of the plurality of rolling stands toward the upstream side of the rolling based on the obtained leveling correction amount. leveling control method.