Leveling control device, rolling equipment equipped with same, and leveling control method

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

[Technical Field]

[0001] The present invention relates to a leveling control device, a rolling facility including the same, and a leveling control method. [Background technology]

[0002] Patent Document 1 describes an example of a plate bow control method in a tandem mill that enables overall, organized and integrated control of the tandem mill, thereby reliably preventing not only bowing of the strip at the delivery side of the final rolling mill stand but also the occurrence of bowing throughout the entire mill. The method describes a method in which a strip is sequentially passed through a plurality of rolling mill stands arranged in series, whereby rolling is performed simultaneously in each rolling mill stand, and the left and right reduction amounts of each rolling mill stand are adjusted based on detected values of left and right tension deviations of the strip between each rolling mill stand to eliminate left and right tension deviations of the strip between each rolling mill stand, thereby controlling plate bow. The adjustment of the reduction amounts of each rolling mill stand is performed ahead of the detection position based on detected values of left and right tension deviations of the strip emerging from that rolling mill stand, and this adjustment operation is carried out sequentially toward the entry rolling mill stand. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 63-29605 Summary of the Invention [Problem to be solved by the invention]

[0004] It is well known that in rolling equipment with high rolling speeds, large curvature of the strip occurs due to the difference in the reduction amount between the left and right sides of the rolling mill or the difference in thickness between the left and right sides of the material. When such a curvature occurs, the product quality is impaired, so there is a strong demand for the development of a control method to prevent this occurrence of curvature.

[0005] As a method for preventing plate bending, for example, there is a method described in Patent Document 1. In Patent Document 1, based on the left - right tension deviation of the strip between each rolling mill stand, roll gap control is performed at the stand in front of the tension detection position, and this control is sequentially advanced toward the inlet side.

[0006] However, since the allowable tension deviation varies depending on the plate width and the tension deviation includes a measurement error, if the measured tension deviation is directly used for roll gap control, there is a risk of reduced accuracy, and it has become clear that there is room for improvement.

[0007] The present invention provides a leveling control device capable of improving the accuracy of roll gap control of each stand in a hot rolling line in which a plurality of rolling stands are arranged, compared with the conventional level, a rolling facility equipped with the same, and a leveling control method.

Means for Solving the Problems

[0008] The present invention includes a plurality of means for solving the above problems. For example, 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 a 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 primary component calculation unit that obtains a tension distribution in the width direction from the obtained torque distribution and obtains a primary component when the tension distribution of the steel plate is represented by a polynomial, a leveling correction amount calculation unit that obtains a leveling correction amount for the rolling stand on the upstream side of rolling among the plurality of rolling stands based on the obtained primary component, and a leveling amount change unit that changes the leveling amount in order from among the plurality of rolling stands toward the upstream side of rolling based on the obtained leveling correction amount. It is characterized by comprising. provided in the leveling correction amount of the rolling stand in order from the rolling stand one upstream from the final stage, toward the upstream side of rolling, excluding the rolling stand at the final stage obtaining for each stage Based on the obtained the rolling stand one upstream from the final stage, excluding the rolling stand at the final stage leveling correction amount, among the plurality of rolling stands , the torque acquisition unit obtains the torque distribution in the width direction of the steel sheet on the downstream side of rolling of the final stand from the torque of the steel sheet obtained by the shape meter provided on the downstream side of rolling of the final stand among the plurality of rolling stands, and the leveling amount changing unit also changes the leveling amount of the final stand before the rolling stand one upstream from the final stage characterized by that.

Effects of the Invention

[0009] According to the present invention, it is possible to improve the accuracy of the control of the roll gap of each stand in a hot rolling line in which a plurality of rolling stands are arranged, compared to the conventional art. Objects, configurations and effects other than those described above will become clear from the following description of the embodiments. [Brief explanation of the drawings]

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

[0011] Hereinafter, embodiments of the leveling control device, the rolling mill equipped with the same, and the leveling control method of the present invention will be described with reference to the drawings.

[0012] In the drawings used in this specification, identical or corresponding components are denoted by the same or similar reference numerals, and repeated description of these components may be omitted.

[0013] In addition, the material to be rolled in the present invention is not limited to a steel sheet, and can generally be a strip of a metal material capable of being rolled, and its type is not particularly limited. In addition to steel sheets, non-ferrous materials such as aluminum and copper can be targeted.

[0014] <Example 1> Example 1 of the leveling control device of the present invention, the rolling equipment equipped with the same, and the leveling control method will be described with reference to FIGS. 1 to 3.

[0015] First, the overall configuration of the rolling equipment including the leveling control device will be described with reference to FIG. 1. FIG. 1 is a schematic diagram showing the configuration of the rolling equipment equipped with the leveling control device of the present Example 1.

[0016] The rolling equipment 200 shown in FIG. 1 is a finishing rolling equipment for rolling the steel sheet 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, an F7 stand 70, cameras 81, 82, 83, 84, 85, 86, shape gauges 91, 92, 93, 94, 95, 96, 97, a leveling control device 150, etc.

[0017] Note that the rolling equipment 200 is not limited to the form in which seven rolling stands as shown in FIG. 1 are provided, and may have at least three stands or more.

[0018] 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 is a rolling mill including an upper work roll and a lower work roll, an upper backup roll and a lower backup roll that support by contacting the upper work roll and the lower work roll respectively, a rolling reduction device 11, 21, 31, 41, 51, 61, 71 provided above the upper backup roll, and load detectors 12, 22, 32, 42, 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 control device 150 via the communication line 110.

[0019] In addition, an upper and lower intermediate roll can be further provided between each upper and lower work roll and each upper and lower backup roll to form a six-stage configuration. The roll configuration of the rolling mill is not limited to the above form, and it is sufficient to have at least upper and lower work rolls.

[0020] Shape gauges 91, 92, 93, 94, 95, and 96 are measuring devices that are respectively provided between F1 stand 10, F2 stand 20, F3 stand 30, F4 stand 40, F5 stand 50, F6 stand 60, and F7 stand 70, and measure the torque of the steel plate 1. Also, it can detect the tension distribution in the plate width direction and can also detect the position of the steel plate 1.

[0021] The information on the surface shape of the steel plate 1 on the outlet side of the F1 stand 10 (inlet side of the F2 stand 20) measured by the shape gauge 91 is transmitted to the leveling control device 150 via the communication line 110. The information on the surface shape of the steel plate 1 on the outlet side of the F2 stand 20 (inlet side of the F3 stand 30) measured by the shape gauge 92 is transmitted to the leveling control device 150 via the communication line 110. The information on the surface shape of the steel plate 1 on the outlet side of the F3 stand 30 (inlet side of the F4 stand 40) measured by the shape gauge 93 is transmitted to the leveling control device 150 via the communication line 110. The information on the surface shape of the steel plate 1 on the outlet side of the F4 stand 40 (inlet side of the F5 stand 50) measured by the shape gauge 94 is transmitted to the leveling control device 150 via the communication line 110. The information on the surface shape of the steel plate 1 on the outlet side of the F5 stand 50 (inlet side of the F6 stand 60) measured by the shape gauge 95 is transmitted to the leveling control device 150 via the communication line 110. The information on the surface shape of the steel plate 1 on the outlet side of the F6 stand 60 (inlet side of the F7 stand 70) measured by the shape gauge 96 is transmitted to the leveling control device 150 via the communication line 110.

[0022] The shape gauge 97 is also a measuring device that measures the surface shape of the steel plate 1, similar to the shape gauges 91 etc., and is provided on the outlet side of the F7 stand 70. The information on the surface shape of the steel plate 1 on the outlet side of the F7 stand 70 measured by the shape gauge 97 is transmitted to the leveling control device 150 via the communication line 110.

[0023] The camera 81 is provided at a position where it is possible to image an image including the steel plate 1 on the exit side of the F1 stand 10 and on the entrance side of the F2 stand 20. The camera 82 is provided at a position where it is possible to image an image including the steel plate 1 on the exit side of the F2 stand 20 and on the entrance side of the F3 stand 30. The camera 83 is provided at a position where it is possible to image an image including the steel plate 1 on the exit side of the F3 stand 30 and on the entrance side of the F4 stand 40. The camera 84 is provided at a position where it is possible to image an image including the steel plate 1 on the exit side of the F4 stand 40 and on the entrance side of the F5 stand 50. The camera 85 is provided at a position where it is possible to image an image including the steel plate 1 on the exit side of the F5 stand 50 and on the entrance side of the F6 stand 60. The camera 86 is provided at a position where it is possible to image an image including the steel plate 1 on the exit side of the F6 stand 60 and on the entrance side of the F7 stand 70.

[0024] These cameras 81, 82, 83, 84, 85, 86 preferably image an image including the steel plate 1, for example, directly above the steel plate 1 or from an obliquely upper position, at intervals shorter than, for example, 0.1 second, preferably in the form of a moving image, and the data of the imaged image is transmitted to the leveling control device 150 via the communication line 110.

[0025] The leveling control device 150 is a device composed of a computer or the like that controls the operation of each device in the rolling facility 200, and has a torque acquisition unit 161, a primary component calculation unit 162, a leveling correction amount calculation unit 163, a leveling amount change unit 164, a meandering amount calculation unit 165, and a storage unit 166, etc.

[0026] The torque obtaining unit 161 obtains the torque distribution applied in the width direction of the steel sheet 1 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 70 from the torque measured by each of the shape meters 91, 92, 93, 94, 95, and 96 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 torque obtaining unit 161 preferably performs the torque obtaining process.

[0027] In addition, the torque acquisition unit 161 calculates the torque distribution in the width direction of the steel plate 1 downstream of the rolling of the final F7 stand 70 from the torque of the steel plate 1 acquired by a shapemeter 97 provided downstream of the rolling of the final F7 stand 70.

[0028] The meandering amount calculation unit 165 calculates the amount of deviation between the center of the steel sheet 1 in the width direction and the rolling center 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 70, from the results of measurements taken by each of the sheet position detectors installed between the F1 stand 10, F2 stand 20, F3 stand 30, F4 stand 40, F5 stand 50, F6 stand 60, and F7 stand 70.

[0029] The plate position detectors that acquire the measurement results used by the meandering amount calculation unit 165 are the above-mentioned cameras 81, 82, 83, 84, 85, and 86 or shape meters 91, 92, 93, 94, 95, 96, and 97.

[0030] The primary component calculation unit 162 calculates the tension distribution in the width direction of the steel sheet 1 from the torque distribution calculated by the torque acquisition unit 161. Furthermore, it calculates the primary component when the tension distribution of the steel sheet 1 is expressed as a polynomial from the calculated tension distribution. At this time, the primary component calculation unit 162 can correct the torque distribution in the width direction of the steel sheet 1 based on the deviation amount (meandering amount ΔYc in FIG. 2) calculated by the meandering amount calculation unit 165. This primary component calculation unit 162 preferably executes the primary component calculation step.

[0031] The leveling correction amount calculation unit 163 calculates the leveling correction amounts of the rolling stands 10, 20, 30, 40, 50, and 60 immediately preceding the rolling upstream side based on the primary components calculated in the primary component calculation unit 162. It is also desirable that the leveling correction amount calculation unit 163 calculates the leveling correction amount of the F7 stand 70 based on the primary components calculated in the primary component calculation unit 162. This leveling correction amount calculation unit 163 preferably executes the leveling correction amount calculation step.

[0032] More specifically, the leveling correction amount calculation unit 163 performs leveling correction for the F6 stand 60 using the first-order component of the tension distribution obtained from the torque of the steel sheet 1 measured by the shapemeter 96 provided on the delivery side of the F6 stand 60. This process is executed sequentially toward the upstream side of the rolling.

[0033] Here, changing the leveling at each stand changes both the first-order components on the entry side and the exit side of each stand, so it is desirable to determine the amount of adjustment using the first-order component on the exit side of the final stand, F7 70. Therefore, it is desirable to correct the leveling of F7 stand 70 using the first-order component of the tension distribution obtained from the torque of the steel sheet 1 measured by a shapemeter 97 provided on the exit side of F7 stand 70.

[0034] Furthermore, if leveling is corrected on the upstream side, the effect will be propagated to the downstream side, so it is desirable to feedback control the leveling amount of each stand so that the plate wedge ratio is constant, i.e., the first-order component is zero.

[0035] Also, when the tail end portion (the end portion of the outermost plate) of the steel plate 1 reaches the shape meter 94 on the inlet side of the F5 stand 50, the shape meter 96 of the F7 stand 70 begins to descend (start to move away from the steel plate 1) toward the lower side in the vertical direction. Therefore, from this timing, it is desirable to perform leveling correction of the F6 stand 60 and the F7 stand 70 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. More specifically, it is desirable to correct the leveling of the F6 stand 60 using the off-center amount between the F5 stand 50 and the F6 stand 60, and correct the leveling of the F7 stand 70 using the off-center between the F6 stand 60 and the F7 stand 70.

[0036] Furthermore, when the tail end portion of the steel plate 1 passes below the camera 86 in front of the F7 stand 70, the amount of meandering cannot be measured. Therefore, it is desirable to switch to lock-on control of the differential load of the F7 stand 70.

[0037] Here, the leveling correction amount calculation unit 163 can obtain a leveling correction amount so that the obtained primary component is within the allowable range.

[0038] FIG. 2 is a diagram showing an example of a method for determining within the allowable range of the primary component.

[0039] FIG. 2 shows the timing when the tail end portion of the steel plate 1 passes through the F6 stand 60. Since the steel plate 1 has passed through the F6 stand 60, only the F7 stand 70 applies left and right restraint forces to the steel plate 1, and there is a risk that the steel plate 1 will meander significantly.

[0040] Let the average thickness of the steel plate 1 on the inlet side of the F7 stand 70 be H, the difference in thickness between both ends of the steel plate 1 on the inlet side be ΔH, the average thickness of the steel plate 1 on the outlet side of the F7 stand 70 be h, the difference in thickness between both ends of the steel plate 1 on the outlet side be Δh, and when the difference between the center in the width direction of the F7 stand 70 and the center in the plate width direction of the steel plate 1, that is, the meandering amount of the steel plate 1 is ΔYc, the meandering amount ΔYc is obtained using the plate rotation angular velocity at the trailing end and the plate velocity moving in the plate width direction. Also, these plate rotation angular velocity and plate velocity are obtained using the change in the plate wedge ratio (Δh / h - ΔH / H). Further, the primary component (elongation difference rate) when the tension distribution of the steel plate 1 is represented by a polynomial has a correlation with the change in the plate wedge ratio (Δh / h - ΔH / H), and the leveling amount (difference in reduction ratio) also has a correlation with ΔH and Δh and can be calculated. From the results, when determining the maximum value of the allowable meandering amount ΔYc (for example, the meandering amount ΔYc in the F7 stand 70 when the trailing end of the steel plate 1 contacts the side guide (omitted for illustration purposes)), it is also possible to calculate the degree of the primary component of the torque distribution acting in the width direction of the steel plate 1 on the outlet side of the F7 stand 70 at the maximum value of the allowable meandering amount ΔYc.

[0041] Therefore, the leveling correction amount calculation unit 163 can obtain the leveling correction amount so that the primary component obtained in the primary component calculation unit 162 is within the allowable range, with the range of the primary component of the torque distribution that can keep the meandering amount ΔYc within the allowable range as the allowable range.

[0042] The leveling amount change unit 164 changes the leveling amount in order from the (final - 1) - stage stand toward the upstream side of rolling 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 the leveling correction amount obtained by the leveling correction amount calculation unit 163. Also, it is desirable for the leveling amount change unit 164 to change the leveling amount of the F7 stand 70 before changing the leveling amount of the (final - 1) - stage stand. This leveling amount change unit 164 preferably serves as the execution entity of the leveling amount change process.

[0043] The leveling amount changing unit 164 outputs the obtained control parameter information of the leveling amount to each of the rolling-down devices 11, 21, 31, 41, 51, 61, 71 via the communication line 120, and each of the rolling-down devices 11, 21, 31, 41, 51, 61, 71 operates to realize the input leveling amount.

[0044] The storage unit 166 is a storage device of a computer constituting the leveling control device 150, and is preferably composed of an SSD or an HDD.

[0045] The control of the operations of each device by the leveling control device 150 and the control of the operations of the torque acquisition units 161, the primary component calculation unit 162, the leveling correction amount calculation unit 163, the leveling amount changing unit 164, the meandering amount calculation unit 165, etc. are executed based on various programs recorded in the storage unit 166.

[0046] Note that the control process of the operations executed by the leveling control device 150 may be combined into one program, may be separated into a plurality of programs respectively, or may be a combination thereof. Also, part or all of the programs may be realized by dedicated hardware or may be modularized.

[0047] Next, referring to FIG. 3, a leveling control method for a hot rolling line in which 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 executed by the leveling control device 150 according to this embodiment, will be described. FIG. 3 is a flowchart showing an example of the flow of the correction control of the leveling amount in the leveling control device of the first embodiment.

[0048] As shown in FIG. 3, first, the shape meter 97 measures the torque of the steel sheet 1 on the outlet side of the F7 stand 70 (the final stand), and the torque acquisition unit 161 of the leveling control device 150 obtains the torque distribution applied in the width direction of the steel sheet 1, and the primary component calculation unit 162 obtains the primary component in the plate width direction of the steel sheet 1 (step S101).

[0049] Next, in the leveling correction amount calculation unit 163 of the leveling control device 150, the leveling correction amount of the F7 stand 70 is calculated in consideration of the primary component obtained in step S101, and the leveling amount is changed in the leveling amount changing unit 164 (step S102).

[0050] Thereafter, the primary component of the tension distribution of the steel sheet 1 between the F6 stand 60 and the F7 stand 70 is obtained in the same manner as in the case of the outlet side of the F7 stand 70 (the final stand) (step S103).

[0051] Thereafter, in the leveling correction amount calculation unit 163, the leveling correction amount of the F6 stand 60 is calculated in consideration of the primary component obtained in step S103, and the leveling amount is changed in the leveling amount changing unit 164 (step S104).

[0052] 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 (corresponding to steps S105, S106, S107, S108, S109, S110, S111, S112, S113, S114 (calculating the leveling correction amount of F1 in consideration of the primary component and changing the leveling) respectively).

[0053] Here, when the leveling is corrected on the upstream side, the influence propagates to the downstream side. Therefore, it is desirable to calculate the leveling correction amount of the F7 stand 70 with the leveling correction at the F6 stand 60 as a constant plate wedge ratio (step S121) and reflect it in the processing of step S102.

[0054] The processing of step S121 is the same for the F5 stand, etc., and the correction amounts for F1 stand 10, F2 stand 20, F3 stand 30, F4 stand 40, F5 stand 50, and F6 stand 60 are set to a constant plate wedge ratio, and the leveling correction amount for each stand is calculated (corresponding to steps S122, S123, S124, S125, and S126), which can be reflected in the processing in step S102, etc.

[0055] In order to avoid continuous looping due to the above-mentioned step S121, etc., it is desirable to record the number of times step S121 is executed, and stop the execution of steps S121, ..., S126 when it has been executed a predetermined number of times, or stop the execution after a certain time has elapsed since the first execution, or stop the execution of the process when the amount of correction in steps S121, ..., S126 falls below a specified value.

[0056] Thereafter, it is determined whether the first-order component of the tension distribution of the steel sheet 1 at each delivery side of all stands satisfies the allowable value (step S130), and if it is determined that it satisfies the allowable value, the processing is completed (the control parameter information of the obtained leveling amount is output to each of the screw down devices 11, 21, 31, 41, 51, 61, 71). On the other hand, if it is determined that it does not satisfy the allowable value at any one stand, the processing returns to step S101, and the processing of determining the control parameter of the leveling amount is continued until the allowable value is satisfied at the delivery side of all stands.

[0057] During rolling, it is desirable to continuously carry out the process shown in Fig. 3. In other words, it is desirable to carry out the process again from the beginning after the process is completed.

[0058] Of the above steps, steps S101 and S103 correspond to a torque acquisition step and a first-order component calculation step, and steps S102, S104, S114, and S126 correspond to a leveling correction amount calculation step and a leveling amount change step.

[0059] Next, the effects of this embodiment will be described.

[0060] In the leveling control device 150 in the rolling equipment 200 of the first embodiment of the present invention described above, a torque acquisition unit 161 that obtains a torque distribution in the width direction of the steel sheet 1 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 70 from the torque measured by each of the shape gauges 91, 92, 93, 94, 95, 96 provided between the stands; a primary component calculation unit 162 that obtains a tension distribution in the width direction from the obtained torque distribution and obtains a primary component when the tension distribution of the steel sheet 1 is represented by a polynomial; a leveling correction amount calculation unit 163 that obtains a leveling correction amount for the rolling stands 10, 20, 30, 40, 50, 60 immediately before the upstream side of rolling based on the obtained primary component; and a leveling amount change unit 164 that changes the leveling amount in order from the F6 stand 60 toward the upstream side of rolling based on the obtained leveling correction amount.

[0061] As a result, it becomes possible to calculate an appropriate leveling amount in consideration of the type of the plate width of the steel sheet 1 and the measurement error, and the accuracy of the rolling reduction control can be improved compared with the conventional case.

[0062] Further, since the leveling correction amount calculation unit 163 obtains the leveling correction amount so that the obtained primary component is within the allowable range, the primary component can be reduced and the plate wedge ratio becomes closer to a constant value. Therefore, it is possible to roll while maintaining the plate wedge, and the effect that the meandering of the steel sheet 1 can be reduced can be obtained, and more stable rolling can be realized.

[0063] Furthermore, when the leveling is changed, the primary components on both the inlet side and the outlet side of each stand change. Therefore, the torque acquisition unit 161 obtains the torque distribution in the width direction of the steel sheet 1 acting on the steel sheet 1 obtained by the shape meter 97 provided on the downstream side of rolling of the F7 stand 70 from the torque of the steel sheet 1, and the leveling amount change unit 164 can further improve the accuracy of the roll gap control by also changing the leveling amount of the F7 stand 70 before the (final - 1) stage stand.

[0064] Also, since it is difficult to accurately measure the left - right tension deviation when the plate is displaced from the rolling center, a meandering amount calculation unit 165 is further provided to obtain the deviation amount between the center in the width direction of the steel sheet 1 and the rolling center 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 70 from the results measured by each plate position detector 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 primary component calculation unit 162 can correct the torque difference by the amount of deviation by correcting the torque distribution in the width direction based on the deviation amount obtained by the meandering amount calculation unit 165, and can obtain the primary component more accurately. Therefore, the accuracy of the roll gap control can be further improved.

[0065] <Example 2> The leveling control device according to Example 2 of the present invention, the rolling facility equipped with the same, and the leveling control method will be described with reference to FIGS. 4 and 5. FIG. 4 is a schematic diagram showing the configuration of a rolling facility equipped with the leveling control device of the present Example 2, and FIG. 5 is a flowchart showing an example of the flow of the correction control of the leveling amount.

[0066] The rolling equipment 200A of this embodiment shown in Fig. 4 is provided with a plate wedge measuring instrument 98 for measuring the plate thickness distribution in the width direction of the steel plate 1 instead of the shape meter 97 provided on the outlet side of the F7 stand 70 in the rolling equipment 200 of the above-described embodiment 1. Note that the plate wedge measuring instrument 98 may be a thickness gauge or a profile gauge as long as it can measure data capable of calculating the plate wedge amount.

[0067] Further, the leveling control device 150A is provided with a plate wedge amount acquisition unit 167A in addition to the leveling control device 150 of the first embodiment.

[0068] The plate wedge amount acquisition unit 167A obtains the plate wedge amount of the steel plate 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 measuring instrument 98 provided on the rolling downstream side of the F7 stand 70.

[0069] 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 acquisition unit 167A, and the leveling amount change unit 164A changes the leveling amount of the F7 stand 70 also before the (final - 1)th stage stand.

[0070] In the rolling at the F7 stand 70 of the rolling equipment 200A, the transfer rate of the plate wedge is considered to be almost 0, and it is considered that the plate wedge before rolling (plate wedge ratio) is inherited as it is. After rolling, that is, the leveling correction amount of the F7 stand is calculated from the actually measured value of the plate wedge on the outlet side of the F7 stand 70, and the oil column difference of the rolling reduction devices 71 on the drive side and the working side is adjusted.

[0071] Next, a leveling control method preferably executed by the leveling control device 150A according to this embodiment will be described with reference to Fig. 5.

[0072] As shown in Fig. 5, first, the plate wedge of the steel plate 1 on the outlet side of the F7 stand 70 is measured by the plate wedge measuring instrument 98 and the plate wedge amount acquisition unit 167A of the leveling control device 150A (step S201).

[0073] Next, the leveling correction amount calculation unit 163A of the leveling control device 150A calculates the leveling correction amount of the F7 stand 70 taking into account the plate wedge obtained in step S101, and the leveling amount change unit 164 changes the leveling amount (step S202). A known method may be used to calculate the leveling correction amount from the obtained plate wedge.

[0074] The subsequent processing in steps S203 to S230 is the same as the processing in steps S103 to S130 in FIG. 3, and the details are omitted here.

[0075] The other configurations and operations are substantially the same as those of the leveling control device, the rolling equipment including the same, and the leveling control method of the first embodiment, and therefore details thereof will be omitted.

[0076] The leveling control device of Example 2 of the present invention, the rolling equipment equipped with the same, and the leveling control method also provide effects that are substantially the same as those of the leveling control device of Example 1, the rolling equipment equipped with the same, and the leveling control method described above.

[0077] In addition, the system is further provided with a plate wedge amount acquisition unit 167A that determines the plate wedge amount of the steel plate 1 on the rolling downstream side of the F7 stand 70 from the widthwise plate thickness distribution measured by a plate wedge amount measuring device 98 provided on the rolling downstream side of the F7 stand 70, and the leveling correction amount calculation unit 163A determines the leveling correction amount of the F7 stand 70 based on the plate wedge amount determined by the plate wedge amount acquisition unit 167A, and the leveling amount change unit 164A also changes the leveling amount of the F7 stand 70 before the (final-1) stage stand, thereby further improving the accuracy of the roll down control even when shape data is not available on the outlet side of the F7 stand 70.

[0078] Example 3 The leveling control device according to Embodiment 3 of the present invention, the rolling facility including the same, and the leveling control method will be described with reference to FIGS. 6 and 7. FIG. 6 is a schematic diagram showing the configuration of a rolling facility including the leveling control device according to Embodiment 3, and FIG. 7 is a flowchart showing an example of the flow of correction control of the leveling amount.

[0079] The rolling facility 200B of the present embodiment shown in FIG. 6 does not have the shape meter 97 in the rolling facility 200 of Embodiment 1 or the plate wedge measuring device 98 in the rolling facility 200A of Embodiment 2, and assumes the data of the plate wedge amount and the tension distribution of the steel sheet 1 on the outlet side of the final stage F7 stand 70 by calculation values when they cannot be obtained. The leveling control device 150B further includes a plate wedge amount calculation unit 168B that obtains the plate wedge amount of the steel sheet 1 on the upstream side of the rolling of the F7 stand 70 based on the rolling load and the leveling amount from the rolling upstream side 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.

[0080] 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 also changes the leveling amount of the F7 stand 70 before the (final - 1) stand.

[0081] In a rolling facility having a plurality of stands, at the front - stage F1 stand 10 and F2 stand 20, a plate wedge is formed so as to substantially follow the leveling, that is, transfer is dominant. On the other hand, at the stands after the F3 stand 30 in the subsequent stage, in order to avoid large deformation of the shape, the wedge (ratio) entering the rolling stand also exits on the outlet side, that is, inheritance is dominant.

[0082] Therefore, based on this phenomenon, the strip wedge at the delivery side of each stand can be estimated. Therefore, once the strip wedge at the entry side of the final stand, F7 stand 70, can be calculated, if the leveling of F7 stand 70 is changed based on the calculated strip wedge amount at the delivery side of F6 stand 60, the effect will be felt upstream, and the tension amounts of shape meters 91, 92, 93, 94, 95, and 96 will change. Thereafter, as in Examples 1 and 2, the leveling amount can be changed and controlled toward the upstream side.

[0083] However, since changing the leveling on the upstream side also affects the calculated value of the plate wedge on the inlet side of F7 stand 70, it is desirable for each stand to independently control its own leveling amount and calculate the plate wedge. For example, the plate wedge calculation in steps S301 to S306 is performed at all times, and the leveling change processing in steps S307 to S330 is performed between the start and end.

[0084] Next, a leveling control method preferably performed by the leveling control device 150B according to this embodiment will be described with reference to FIG.

[0085] As shown in Figure 7, first, the plate wedge amount calculation unit 168B of the leveling control device 150B calculates the plate wedge on the delivery side of the F1 stand 10 using the measured rolling load P, roll profile predicted value Cw, and measured leveling ΔS at the F1 stand 10 (step S301).

[0086] Next, in the plate wedge amount calculation unit 168B, the plate wedge at the delivery side of the F2 stand 20 is calculated using the calculated plate wedge value at 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 predicted roll profile value Cw, and the measured leveling ΔS (step S302).

[0087] The same processes as steps S301 and S302 are also executed for stands F3 30, F4 40, F5 50, and F6 60 (corresponding to steps S303, S304, S305, and S306, respectively).

[0088] After that, as described above, in the rolling at stand F7 70, since the transfer rate of the plate wedge is considered to be almost 0, in the leveling correction amount calculation unit 163B of the leveling control device 150B, considering the plate wedge (plate wedge ratio) on the outlet side of stand F6 60 calculated in the step corresponding to step S306 before rolling, the leveling correction amount for stand F7 70 is calculated, and the leveling amount is changed in the leveling amount change unit 164B (step S307).

[0089] The subsequent steps S308 and later are basically the same as the respective processes of steps S103 to S130 in FIG. 3 described above, and the details are omitted. The difference is that when it is determined that none of the stands satisfies the condition in step S330, the process returns to step S307, and the process of obtaining the control parameters of the leveling amount continues until all stands are satisfied.

[0090] The other configurations and operations are substantially the same as those of the leveling control device of the above-described embodiment 1, the rolling facility equipped with the same, and the leveling control method, and the details are omitted.

[0091] In the leveling control device of embodiment 3 of the present invention, the rolling facility equipped with the same, and the leveling control method, almost the same effects as those of the leveling control device of the above-described embodiment 1, the rolling facility equipped with the same, and the leveling control method can be obtained.

[0092] The system further includes a plate wedge amount calculation unit 168B that calculates the plate wedge amount of the steel plate 1 on the upstream side of rolling of F7 stand 70 based on the rolling load and leveling amount of F1 stand 10, F2 stand 20, F3 stand 30, F4 stand 40, F5 stand 50, F6 stand 60, and F7 stand 70 from the upstream side of rolling to the (last-1)th stand, and the leveling correction amount calculation unit 163B calculates the leveling correction amount of F7 stand 70 based on the plate wedge amount calculated by the plate wedge amount calculation unit 168B, and the leveling amount change unit 164B also changes the leveling amount of F7 stand 70 before the (last-1)th stand, thereby further improving the accuracy of roll down control even when various data are not available on the outlet side of F7 stand 70.

[0093] <Other> It should be noted that the present invention is not limited to the above-described embodiment, and includes various modifications. The above-described embodiment has been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to an embodiment having all of the described configurations.

[0094] 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, or to add, delete, or replace part of the configuration of each embodiment with the configuration of another embodiment. [Explanation of symbols]

[0095] 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... Camera 91, 92, 93, 94, 95, 96, 97… Shape gauge 98… Plate wedge measuring instrument 110, 120… Communication line 150, 150A, 150B… Levelling control device 161… Torque acquisition unit 162… Primary component calculation unit 163, 163A, 163B… Levelling correction amount calculation unit 164, 164A, 164B… Levelling amount change unit 165… Sway amount calculation unit 166… Memory unit 167A… Plate wedge amount acquisition unit 168B… Plate wedge amount calculation unit 200, 200A, 200B… Rolling equipment

Claims

1. 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 applied in the width direction of a 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 a tension distribution in the width direction from the obtained torque distribution and obtains a primary component when the tension distribution of the steel sheet is represented by a polynomial; a leveling correction amount calculation unit that obtains, based on the obtained primary component, leveling correction amounts of the rolling stands provided on the upstream side of rolling among the plurality of rolling stands in order from the rolling stand one upstream from the final stage toward the upstream side of rolling, excluding the rolling stand at the final stage; a leveling amount change unit that changes the leveling amount in order from the rolling stand one upstream from the final stage toward the upstream side of rolling among the plurality of rolling stands, excluding the rolling stand at the final stage, based on the obtained leveling correction amount for each stage, wherein the torque acquisition unit obtains a torque distribution applied in the width direction of the steel sheet on the downstream side of rolling of the final stand from the torque of the steel sheet acquired by a shape meter provided on the downstream side of rolling of the final stand among the plurality of rolling stands, and the leveling amount change unit also changes the leveling amount of the final stand before the rolling stand one upstream from the final stage. A leveling control device characterized by the above.

2. In the leveling control device according to Claim 1, the leveling correction amount calculation unit obtains the leveling correction amount so that the obtained primary component is within an allowable range. A leveling control device characterized by the above.

3. In the leveling control device according to Claim 1 or 2, further comprising a meandering amount calculation unit that obtains the amount of deviation between the center in the width direction of the steel sheet and the rolling center between each of the plurality of rolling stands from the results measured by each plate position detector provided between the plurality of rolling stands, wherein the primary component calculation unit corrects the torque distribution in the width direction based on the amount of deviation obtained by the meandering amount calculation unit. A leveling control device characterized by the above.

4. A leveling control device according to any one of Claims 1 to 3, a plurality of rolling stands for rolling the steel sheet, and a shape meter provided between each of the plurality of rolling stands. A rolling facility characterized by the above.

5. 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 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 step of obtaining a tension distribution in the width direction from the obtained torque distribution and obtaining a primary 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, in order from the rolling stand one upstream from the final stage excluding the final stage of the rolling stands among the plurality of rolling stands, the leveling correction amount of the rolling stand provided on the upstream side of rolling based on the obtained primary component; a leveling amount change step of changing the leveling amount in order from the rolling stand one upstream from the final stage excluding the final stage of the plurality of rolling stands toward the upstream side of rolling based on the obtained leveling correction amount for each stage, comprising: in the torque acquisition step, obtaining a torque distribution applied in the width direction of the steel sheet on the downstream side of rolling of the final stand from the torque of the steel sheet acquired by the shape meter provided on the downstream side of rolling of the final stand among the plurality of rolling stands; in the leveling amount change step, also changing the leveling amount of the final stand before the rolling stand one upstream from the final stage; A leveling control method characterized by the above.

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