Rolling equipment monitoring and control device, rolling equipment, rolling equipment monitoring and control method, and rolling equipment monitoring and control program

Abstract

To provide a monitoring control device of a rolling device, a rolling facility, a monitoring control method of a rolling device, and a monitoring control program of a rolling device, capable of easily evaluating, making a shape of a pressure roll a polygonal shape.SOLUTION: A monitoring control device of a rolling device is a device for monitoring or controlling a rolling device, and comprises: a vibration data acquiring part for, during rolling of a metal plate by the rolling device, acquiring vibration data indicating vibration of the pressure roll of the rolling device; a cumulative vibration amplitude acquiring part for, in each of a plurality of square numbers N of the pressure roll, acquiring a cumulative vibration amplitude which is a total sum of amplitudes of vibration in a frequency corresponding to the square number N for every rotation number of the pressure roll, from the vibration data; a first index acquiring part for acquiring a making polygonal shape index which indicates, a magnitude of a vibration of the cumulative vibration amplitudes which are acquired according to the plurality of square numbers N; and an evaluation part for evaluating a state of the rolling device, on the basis of the making polygonal shape index.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a monitoring and control device for a rolling mill, a rolling facility, a monitoring and control method for a rolling mill, and a monitoring and control program for a rolling mill. [Background technology]

[0002] When rolling materials such as metal plates continues in a rolling mill containing rolls, wear occurs due to the contact between the rolls and the rolled material as they rotate, which can cause the roll's cross-sectional shape to approach a specific N-gon. When N-gonalization of rolls occurs and grows, irregularities corresponding to the N-gon of the rolls form on the surface of the material rolled by the rolls, which can cause problems with product quality. It can also lead to increased roll replacement frequency and reduced productivity. Furthermore, roll polygonalization increases vibration levels, potentially damaging the rolling equipment itself. Therefore, it is desirable to properly understand the growth trend of N-gonalization of rolls and, if possible, prevent polygonalization.

[0003] Patent Document 1 describes a method of calculating a characteristic value σ, which indicates an index of change in the vibration amplitude of a rolling roll over time, from vibration data of the rolling roll during rolling at a constant rotation speed of the rolling roll, and evaluating the growth tendency of the rolling roll toward N-gonalization based on the characteristic value σ. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2021 / 024447 Summary of the Invention [Problem to be solved by the invention]

[0005] The evaluation method for a rolling mill described in Patent Document 1 is applicable to rolling at a constant rotational speed of the rolling rolls, and cannot be applied when the rolling speed changes. Furthermore, the method described in Patent Document 1 requires the acquisition in advance of a database showing the correlation between the rotational speed of the rolling rolls and the characteristic value σ in order to evaluate polygonalization of the rolling rolls. Furthermore, this database corresponds to the rolling conditions (steel type, temperature, reduction, etc.) and the deterioration state of the rolling mill, and it is not easy to acquire a database that corresponds to various conditions.

[0006] In view of the above circumstances, at least one embodiment of the present invention aims to provide a monitoring and control device for a rolling mill, rolling equipment, a monitoring and control method for a rolling mill, and a monitoring and control program for a rolling mill that can more easily evaluate the polygonalization of rolling rolls. [Means for solving the problem]

[0007] A monitoring and control device for a rolling mill according to at least one embodiment of the present invention includes: A monitoring and control device for monitoring or controlling a rolling mill, a vibration data acquisition unit configured to acquire vibration data indicating vibration of the rolling rolls of the rolling mill during rolling of the metal plate in the rolling mill; a cumulative vibration amplitude acquiring unit configured to acquire, for each of a plurality of polygonal numbers N of the rolling roll, a cumulative vibration amplitude which is a sum of amplitudes of the vibrations at frequencies corresponding to the polygonal number N for each rotation number of the rolling roll from the vibration data; a first index acquisition unit configured to acquire a polygonal index indicating a magnitude of variation in the cumulative vibration amplitude obtained corresponding to each of the plurality of polygon numbers N; an evaluation unit configured to evaluate a state of the rolling mill based on the polygonal index; Equipped with.

[0008] Further, the rolling equipment according to at least one embodiment of the present invention includes: a rolling device including a rolling roll for rolling a metal plate; the aforementioned monitoring and control device configured to evaluate the condition of the rolling rolls; Equipped with.

[0009] Further, a monitoring and control method for a rolling mill according to at least one embodiment of the present invention includes: A monitoring and control method for monitoring or controlling a rolling mill, comprising: acquiring vibration data indicating vibration of rolls of the rolling mill during rolling of the metal plate in the rolling mill; A step of acquiring, for each of a plurality of polygonal numbers N of the rolling roll, a cumulative vibration amplitude which is a sum of amplitudes of the vibration at frequencies corresponding to the polygonal number N for each rotation number of the rolling roll from the vibration data; obtaining a polygonalization index indicating a degree of variation in the cumulative vibration amplitude obtained corresponding to each of the plurality of numbers of polygons N; evaluating the condition of the rolling mill based on the polygonal index; Equipped with.

[0010] Further, a monitoring and control program for a rolling mill according to at least one embodiment of the present invention includes: A monitoring and control program for monitoring or controlling a rolling mill, On the computer, acquiring vibration data indicating vibration of rolls of the rolling mill during rolling of the metal plate in the rolling mill; a step of acquiring, for each of a plurality of polygonal numbers N of the rolling roll, a cumulative vibration amplitude which is a sum of amplitudes of the vibration at frequencies corresponding to the polygonal number N for each rotation number of the rolling roll from the vibration data; a step of acquiring a polygonalization index indicating a degree of variation in the cumulative vibration amplitude obtained corresponding to each of the plurality of numbers of polygons N; evaluating the condition of the rolling mill based on the polygonal index; Execute the following. [Effects of the Invention]

[0011] According to at least one embodiment of the present invention, there are provided a monitoring and control device for a rolling mill, a rolling facility, a monitoring and control method for a rolling mill, and a monitoring and control program for a rolling mill, which are capable of more easily evaluating the polygonal shape of rolls. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic diagram of rolling equipment according to an embodiment. [Figure 2] FIG. 1 is a schematic configuration diagram of a monitoring control device according to an embodiment; [Figure 3] 1 is a schematic flowchart of a monitoring and control method for a rolling mill according to an embodiment. [Figure 4] 1 is a chart showing an example of the results of time-frequency analysis of vibration data of a rolling roll obtained during rolling. [Figure 5] 10 is a graph showing an example of the analysis results of the time history of the magnitude of the vibration level for each polygon number N (order). [Figure 6] 10 is a graph showing an example of cumulative vibration amplitude for each polygon number N. [Figure 7] 10 is a graph showing an example of the coefficient of variation of the cumulative vibration amplitude. [Figure 8] 10 is an example of an evaluation map showing the correlation between a polygonal index and a vibration level index. [Figure 9] 10A and 10B are diagrams for explaining time-series changes in a polygonal index and a vibration level index. [Figure 10A] 10 is a graph showing the cumulative vibration amplitude at P1 in the map of FIG. 9. [Figure 10B] 10 is a graph showing the cumulative vibration amplitude at P2 in the map of FIG. 9. [Figure 10C] 10 is a graph showing the cumulative vibration amplitude at P3 in the map of FIG. 9. [Figure 10D] 10 is a graph showing the cumulative vibration amplitude at P4 in the map of FIG. 9. [Figure 10E] 10 is a graph showing the cumulative vibration amplitude at P5 in the map of FIG. 9. [Figure 11]FIG. 10 is a diagram showing the difference between a case where a vibration level index is used and a case where a corrected vibration level index is used. [Figure 12] FIG. 1 is a schematic diagram of a rolling mill in which N-gonalization of rolls occurs. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0014] (Rolling equipment configuration) Fig. 1 is a schematic diagram of a rolling facility to which a monitoring control device and a monitoring control method according to some embodiments are applied. As shown in Fig. 1, the rolling facility 1 according to one embodiment comprises a rolling mill 2 including a rolling stand 10 configured to roll a metal sheet S, and a monitoring control device 50 configured to evaluate the state of the rolling mill 2. The rolling facility 1 also comprises a vibration measurement unit 90 for measuring vibrations of the rolls 3 that constitute the rolling stand 10.

[0015] The rolling stand 10 includes a plurality of rolls 3 for rolling the metal sheet S, a reduction device 8 for applying a load to the rolls 3 to reduce the metal sheet S, a housing (not shown), etc. The reduction device 8 may include a hydraulic cylinder.

[0016] In the rolling mill 2 shown in Fig. 1, the rolling rolls 3 include a pair of work rolls 4A, 4B arranged to sandwich the metal sheet S, and a pair of backup rolls 6A, 6B arranged on the opposite side of the pair of work rolls 4A, 4B from the metal sheet S, for supporting the pair of work rolls 4A, 4B, respectively. The work rolls 4A, 4B are rotatably supported by roll chocks (bearings) 5A, 5B, respectively. The backup rolls 6A, 6B are rotatably supported by roll chocks 7A, 7B, respectively. The roll chocks 5A, 5B and the roll chocks 7A, 7B are supported by housings (not shown).

[0017] In the rolling equipment 1 shown in Fig. 1, the vibration measurement unit 90 includes acceleration sensors 91-94 attached to the roll chocks 5A, 5B, 7A, and 7B, respectively. The acceleration sensors 91-94 are configured to detect vibrations in any direction of the roll chocks 5A, 5B, 7A, and 7B (for example, vertical, horizontal, and / or the direction of the rotation axis of the roll 3), i.e., vibrations in any direction of the work rolls 4A and 4B and backup rolls 6A and 6B. Signals indicative of the vibrations detected by the acceleration sensors 91-94 are sent to the monitoring control device 50.

[0018] In another embodiment, the vibration measuring unit 90 may include a displacement detecting unit configured to measure the displacement of the rolling roll 3 in any direction. In this case, the vibration of the rolling roll 3 may be calculated based on the measurement results by the displacement detecting unit. For example, a laser-type or eddy current-type displacement meter may be used as the displacement detecting unit. Alternatively, an imaging device (camera, etc.) may be used as the displacement detecting unit. In this case, the vibration of the rolling roll 3 may be calculated by imaging a portion of the rolling roll 3 with the imaging device and processing the obtained imaging data.

[0019] 2 is a schematic configuration diagram of a monitoring control device 50 according to one embodiment. The monitoring control device 50 is configured to evaluate the polygonal (N-gonal) state of the rolls 3, as will be described in detail later.

[0020] The monitoring and control device 50 is configured to receive signals indicating the vibration of the rolling rolls 3 from the vibration measuring unit 90, and also to receive signals indicating the rotation speed of the rolling rolls 3 (work rolls 4A, 4B, etc.) measured by the rotation speed measuring unit 96. The monitoring and control device 50 is also configured to process the signals received in this manner.

[0021] 2, the monitoring control device 50 includes a vibration data acquisition unit 52, a cumulative vibration amplitude acquisition unit 54, a first index acquisition unit 56, a second index acquisition unit 58, an evaluation unit 60, an operating condition determination unit 62, and a control unit 64. The monitoring control device 50 also includes an output unit 66 configured to output the calculation results and evaluation results obtained by the monitoring control device 50. The calculation results and evaluation results obtained by the monitoring control device 50 are output to a display unit 68 (such as a display) via the output unit 66.

[0022] The vibration data acquisition unit 52 is configured to acquire vibration data indicating the vibration of the rolls 3 of the rolling mill 2 while the metal plate is being rolled in the rolling mill 2 .

[0023] The cumulative vibration amplitude acquisition unit 54 is configured to acquire, for each of the multiple polygonal numbers N of the rolling roll 3, a cumulative vibration amplitude, which is the sum of the amplitudes of vibrations at frequencies corresponding to the polygonal number N for each rotation number of the rolling roll 3, from the vibration data acquired by the vibration data acquisition unit 52.

[0024] The first index acquiring unit 56 is configured to acquire a polygonal index indicating the magnitude of variation in the cumulative vibration amplitude obtained corresponding to each of the plurality of numbers N of polygons.

[0025] The second index acquisition unit 58 is configured to acquire a vibration level index that indicates the vibration level of the reduction rolls 3 during rolling of the metal sheet S from the vibration data acquired by the vibration data acquisition unit 52.

[0026] The evaluation unit 60 is configured to evaluate the condition of the mill roll 3 based on the polygonal index and / or the vibration level index described above.

[0027] The operating condition determining unit 62 is configured to determine the operating conditions of the rolling mill 2 (for example, the rotational speed of the rolling rolls 3, etc.) based on the evaluation results by the evaluating unit 60, for example.

[0028] The control unit 64 controls the rolling mill 2 so as to realize the operating conditions determined by the operating condition determination unit 62. The control unit 64 may be configured to adjust the current value of the motor 70 that drives the mill rolls 3 in order to control the rotation speed of the mill rolls 3.

[0029] The monitoring and control device 50 includes a computer equipped with a processor (e.g., a CPU or GPU), a storage device (e.g., a memory device; e.g., a RAM), an auxiliary storage unit, an interface, etc. The monitoring and control device 50 receives signals from various measuring instruments (e.g., the vibration measurement unit 90 or the rotation speed measurement unit 96 described above) via the interface. The processor is configured to process the signals received in this manner. This realizes the functions of each functional unit (e.g., the vibration data acquisition unit 52, the cumulative vibration amplitude acquisition unit 54, the first index acquisition unit 56, the second index acquisition unit 58, the evaluation unit 60, the operating condition determination unit 62, and the control unit 64) described below.

[0030] The processing contents of the monitoring and control device 50 are implemented as programs executed by the processor. The programs may be stored in an auxiliary storage unit. When the programs are executed, they are loaded into the storage device. The processor reads the programs from the storage device and executes the instructions contained in the programs.

[0031] As the rolling of the metal sheet S continues in the rolling apparatus 2 described above, N-gonalization, in which the cross-sectional shape of the rolls 3 approaches a specific N-gon, may occur. Here, FIG. 12 is a schematic diagram of a rolling apparatus in which N-gonalization of the rolls 3 occurs. The rolling apparatus 2 shown in FIG. 12 includes multiple rolling stands 10A to 10C. The cross-sectional shape perpendicular to the axial direction of the rolls 3 is usually circular, like the rolls 3 of the roll stands 10A or 10C, but the cross-sectional shape of the rolls 3 (work rolls 4A, 4B and backup rolls 6A, 6B) of the roll stand 10B shown in FIG. 12 is an N-gon (specifically, a dodecagon), and N-gonalization has occurred in these rolls 3.

[0032] When N-gonalization of the rolling rolls 3 occurs and grows, irregularities corresponding to the N-gonalization of the rolling rolls 3 are formed on the surface of the metal sheet S rolled by the rolling rolls 3, which may cause problems in terms of product quality. Therefore, it is desirable to properly grasp the state of N-gonalization of the rolling rolls 3 and suppress deterioration in the quality of the product metal sheet.

[0033] In addition, Figure 12 shows a schematic diagram of the formation of a dodecagon (N=12) in each rolling roll 3, but in an actual rolling mill, N-gons with N of about 50 or 100 may occur in the rolling roll 3, depending on the operating conditions such as the rotation speed of the rolling roll 3.

[0034] Furthermore, depending on the operating conditions and specifications (natural frequency, etc.) of the rolling mill 2, N-gonalization may occur in the rolls 3 in a specific rolling stand 10, or N-gonalization may occur in a specific roll 3 (work rolls 4A, 4B or backup rolls 6A, 6B) among the multiple rolls 3 constituting one rolling stand. For example, in the case of hot rolling performed at a relatively high temperature, N-gonalization is relatively likely to occur in the work rolls 4A, 4B. In addition, in the case of cold rolling performed at a relatively low temperature, N-gonalization is relatively likely to occur in the backup rolls 6A, 6B.

[0035] (Monitoring control flow of rolling equipment) Next, a monitoring and control method for the rolling mill 2 according to some embodiments will be described. In this monitoring and control method, the polygonal state of the rolling rolls 3 (at least one of the work rolls 4A, 4B or the backup rolls 6A, 6B) is evaluated. Note that, although a method for evaluating the state of the rolling mill 2 using the above-mentioned monitoring and control device 50 will be described below, in some embodiments, some or all of the processing by the monitoring and control device 50 described below may be performed using other devices or manually.

[0036] Fig. 3 is a schematic flowchart of a monitoring and control method for a rolling mill 2 according to one embodiment. In the method according to the flowchart of Fig. 3, one polygonal index and / or one vibration level index is obtained for each coil of the metal sheet S rolled by the rolling mill 2. In this case, one plot on the evaluation map described below is obtained for each coil of the metal sheet S. In other embodiments, one polygonal index and / or one vibration level index may be obtained for each predetermined time while the metal sheet S is being rolled.

[0037] In the method shown in the flowchart of FIG. 3, first, a first coil (metal plate S) is rolled using the rolling mill 2 (S2).

[0038] Next, while the coil is being rolled, the vibration of the rolling roll 3 is measured by the vibration measuring unit 90. The vibration measuring unit 90 may be configured to measure the acceleration of the rolling roll 3 in a specific direction (for example, the acceleration in the horizontal direction) as an amount indicating the vibration of the rolling roll 3. The vibration measuring unit 90 may measure the vibration of the rolling roll 3 until rolling of the coil being rolled is completed. The vibration data acquiring unit 52 acquires vibration data indicating the vibration of the rolling roll 3 measured by the vibration measuring unit 90 (S4).

[0039] Next, the cumulative vibration amplitude acquisition unit 54 performs a time-frequency analysis on the vibration data acquired in step S4 (S6). For the time-frequency analysis, for example, a fast Fourier transform (FFT) can be used, but other means such as a wavelet transform may also be used.

[0040] FIG. 4 is a chart showing an example of the results of time-frequency analysis of vibration data of the mill roll 3 obtained during the rolling of one coil. The horizontal axis of the chart in FIG. 4 represents time, and the vertical axis represents the vibration frequency. The color intensity represents the magnitude of the vibration level, with darker colors indicating stronger vibration. Note that FIG. 4 shows the results of frequency analysis of vibration data obtained when rolling a coil while increasing the rotational speed of the mill roll 3 in the range of 90 rpm to 150 rpm over a period of approximately 90 seconds, divided into vibration data for each predetermined period (e.g., every 1 second).

[0041] In the graph of Figure 4, strong vibrations (accelerations) occur at frequencies of approximately 70 to 80 Hz throughout the rolling period. The frequency of vibrations resulting from the shape (N-gonal) of the rolling roll 3 corresponds to the product (f x N) of the rotational speed f and N of the rolling roll 3. From this, at a rotational speed of approximately 90 rpm (approximately 1.5 Hz) immediately after the start of rolling, strong vibrations indicate a 47-53 polygon (N = 47-53), and at a rotational speed of approximately 150 rpm (approximately 2.5 Hz) immediately before the end of rolling, strong vibrations indicate a 28-32 polygon (N = 28-32). It is estimated that polygonalization of the roll occurs in each time period, corresponding to the N number.

[0042] Next, the cumulative vibration amplitude acquisition unit 54 acquires, for each of the multiple polygonal numbers N of the rolling roll 3, a cumulative vibration amplitude, which is the sum of the amplitude of vibration at a frequency corresponding to the polygonal number N for each rotation number i of the rolling roll 3 from the start to the end of one rolling (or from the start to the end of rolling one coil), based on the vibration data indicating the vibration of the rolling roll 3 (S8). Note that, when N is the polygonal number of the rolling roll 3 and i is the rotation number of the rolling roll 3 (the number of rotations from the start of rolling (i=1) to the end of rolling), the vibration amplitude in the i-th rotation of the polygonal number N (N polygons) is expressed as A N,i Then, the cumulative vibration amplitude is ΣA N,i It can be expressed as:

[0043] Step S8 will now be described in more detail. First, an order ratio analysis (a type of time-frequency analysis) is performed on the data obtained by the vibration measurement unit 90 to analyze the time history of the magnitude of the vibration level (for example, the vibration amplitude of acceleration) for each polygon number N (also called the order). Here, Fig. 5 is a graph showing an example of the analysis results of the time history of the magnitude of the vibration level for each polygon number N (order).

[0044] Next, the magnitude of the vibration level (vibration amplitude) obtained for each number of polygons N (see Figure 5) is analyzed over time to obtain the cumulative vibration amplitude corresponding to each number of polygons N. Figure 6 is a graph showing the cumulative vibration amplitude for each number of polygons N for several coils (coils A to F).

[0045] The cumulative vibration amplitude may also be calculated as follows. That is, the data on the number of rotations of the rolling roll is integrated to obtain the time history of the number of rotations i of the rolling roll. Since the number of rotations i and time correspond one-to-one, a graph can be created of the number of rotations i and the vibration amplitude for each order (number of polygons N). By taking the sum of the vibration amplitude for each order (number of polygons N) from the first rotation to the final rotation, the cumulative vibration amplitude for each order (number of polygons N) can be obtained.

[0046] Next, the first index acquisition unit 56 calculates a plurality of cumulative vibration amplitudes ΣA obtained corresponding to the plurality of polygon numbers N acquired in step S8. N,i The polygonal index is calculated by multiplying the cumulative vibration amplitudes ΣA N,i 7 shows the cumulative vibration amplitude ΣA for each coil shown in FIG. N,i 1 is a graph showing the coefficient of variation of

[0047] In Figure 7, the cumulative vibration amplitude ΣA N,iLooking at the graph in FIG. 6 for coil E, which has a relatively large coefficient of variation of N, we see that there is a peak in the cumulative vibration amplitude near N=30 (tridecagon), and that in other regions of the number of polygons N (for example, when N is 25 or less or 35 or more), the cumulative vibration amplitude is relatively small. This shows that when rolling coil E, the degree of tridecagonization increases in the rolls 3 of the rolling mill 2. It also shows that the state of polygonization in the rolls 3 can be appropriately evaluated using an index indicating the variation in the cumulative vibration amplitude (for example, the coefficient of variation of the cumulative vibration amplitude). For example, by comparing the polygonization index with a threshold value, it can be determined whether polygonization has progressed to an unacceptable level.

[0048] According to the embodiment described above, the cumulative vibration amplitude for each of a plurality of polygonal numbers N is calculated based on vibration data indicating the vibration of the roll 3 during operation of the rolling mill 2. A polygonalization index indicating the degree of variation in the cumulative vibration amplitude is obtained from the cumulative vibration amplitude for each of the plurality of polygonal numbers N. A large polygonalization index indicates that the roll is undergoing a shape transformation into a specific N-sided polygon. Therefore, the polygonalization state of the roll can be appropriately evaluated based on this polygonalization index. Here, the rotational speed of the roll 3 does not need to be constant when acquiring the vibration data. In other words, according to the embodiment described above, even if the rotational speed of the roll 3 changes during rolling or without preparing a database in advance, the polygonalization of the roll 3 can be appropriately evaluated based on the vibration data during rolling. Therefore, the polygonalization of the roll 3 can be easily evaluated.

[0049] The rest of the flowchart will be explained. Next, the second index acquisition unit 58 acquires a vibration level index that indicates the vibration level of the reduction roll 3 during rolling of the coil (metal plate S) based on the vibration data acquired in step S4 (S12).

[0050] The vibration level index acquired in step S12 may be an index indicating the magnitude of acceleration in a specific direction (for example, the horizontal direction) of the rolling roll 3, and may be, for example, the root mean square (RMS value) of the acceleration in the specific direction. Alternatively, the vibration level index acquired in step S12 may be an index indicating the magnitude of displacement in a specific direction (for example, the horizontal direction) of the rolling roll 3, and may be, for example, the root mean square (RMS value) of the displacement in the specific direction.

[0051] If the vibration level index is large, it can be determined that there is an increase in the vibration of the rolling roll 3. For example, based on a comparison between the vibration level index and a threshold value, it can be determined whether or not the vibration level of the rolling roll 3 is within an allowable range.

[0052] Next, the monitoring control device 50 plots the polygonal index acquired in step S10 and the vibration level index acquired in step S12 on an evaluation map (S14). The evaluation map indicates the correlation between the polygonal index and the vibration level index. Based on this evaluation map, the condition of the work roll 3 can be evaluated.

[0053] Figure 8 shows the polygonal index (I P ) (vertical axis) and vibration level index (I V 8 is an example of an evaluation map showing the correlation between the coefficient of vibration and the coefficient of vibration (horizontal axis). Each of the multiple plots in the evaluation map of FIG. 8 indicates the values ​​of the polygonal index and the vibration level index obtained based on the vibration data measured during the rolling of one coil. The rolling of each coil was performed using the same rolling mill 2 and the same rolling rolls 3.

[0054] The map in Figure 8 shows the polygonal index above the threshold I P_th and the vibration level index is threshold I v_th Based on this, it is divided into four regions (regions (a) to (d)).

[0055] Region (a) is the polygonal index when the threshold value I P_th Less than or equal to threshold Iv_th If the plots of the polygonalization index and vibration level are in region (a), the polygonalization of the roll 3 has not progressed to an unacceptable extent at the time of rolling the coil, and the vibration is relatively small, so it can be evaluated that there is no problem with the rolling device 2 and that the roll 3 can continue to be used.

[0056] Region (b) is the polygonal index when the threshold value I P_th Less than or equal to threshold I v_th If the polygonalization index and vibration level plots are in region (b), the polygonalization of the roll 3 has not progressed to an unacceptable extent at the time of rolling the coil, but the vibration is relatively large, so it can be evaluated that, for example, although the roll 3 can continue to be used, there is a risk of problems occurring in the rolling mill 2.

[0057] Area (c) is the polygonal index below the threshold I P_th or more, and the vibration level index is threshold I v_th If the plot of the polygonalization index and vibration level is in region (c), the vibration is relatively small at the time of rolling the coil, but the polygonalization of the mill roll 3 has progressed to an unacceptable level, and therefore, for example, it can be evaluated that the mill roll 3 can continue to be used, but there is a possibility that the vibration will grow into a large one due to polygonalization.

[0058] Region (d) is the polygonal index below the threshold I P_th or more, and the vibration level index is threshold I v_th If the plot of the polygonalization index and vibration level is in region (d), the vibration is relatively large at the time of rolling the coil, and polygonalization of the mill roll 3 has progressed to an unacceptable extent, so it can be evaluated that the mill roll 3 needs to be replaced, for example.

[0059] The evaluation map acquired in step S14 may be displayed on the display unit 68 (such as a display).

[0060] Next, the operating condition determination unit 62 compares the polygonal index acquired in step S10 with a threshold value (S16). If the polygonal index is equal to or greater than the threshold value (No in S16), the operating conditions of the rolling mill 2 are determined so that the polygonal index does not exceed the threshold value. Furthermore, the control unit 64 changes the operating conditions of the rolling mill 2 (for example, the rotation speed of the rolling rolls 3) so as to satisfy the determined operating conditions.

[0061] Alternatively, the operating condition determination unit 62 compares the vibration level index acquired in step S12 with a threshold value (S16). If the vibration level index is less than the threshold value (Yes in S16), the operating conditions are not changed and rolling of the next coil is started (S20). On the other hand, if the vibration level index is equal to or greater than the threshold value (No in S16), the operating conditions of the rolling mill 2 are determined so that the vibration level index does not exceed the threshold value. Then, the control unit 64 changes the operating conditions of the rolling mill 2 (e.g., the rotation speed of the mill rolls 3) to satisfy the determined operating conditions (S18), and rolls the next coil (S20).

[0062] Alternatively, the operating condition determination unit 62 compares the polygonalization index acquired in step S10 and the vibration level index acquired in step S12 with their respective threshold values ​​(S16). If both the polygonalization index and the vibration level index are equal to or greater than the threshold value (No in S16), the operating conditions of the rolling mill 2 may be determined so that the polygonalization index does not exceed the threshold value. Furthermore, the control unit 64 may change the operating conditions of the rolling mill 2 (for example, the rotation speed of the rolling rolls 3) so as to satisfy the determined operating conditions.

[0063] The comparison of the polygonal index and / or the vibration level index with the threshold value in step S16 may use the evaluation map created in step S14.

[0064] Fig. 9 is a diagram for explaining time-series changes in the polygonal index and vibration level index for a certain rolling roll 3. Fig. 9 is a map similar to the evaluation map shown in Fig. 8, and P1 to P5 in the map are points indicating the polygonal index and vibration level index at different times (or different coils). Figs. 10A to 10E are graphs showing the cumulative vibration amplitude for each number of polygons N, obtained in the process of calculating the polygonal index at P1 to P5 in the map of Fig. 9.

[0065] In one example of rolling equipment 1, the polygonalization index and vibration level index change from P1 to P2, and from P2 to P3. At P1, both the polygonalization index and the vibration level index are below the threshold, but at P2, the polygonalization index exceeds the threshold, and at P3, both the polygonalization index and the vibration level index exceed the threshold. Unless the operating conditions of the rolling equipment 1 are changed, the polygonalization index and the vibration level index usually increase gradually in this manner. Furthermore, referring to the graphs of FIGS. 10A to 10C, it can be seen that the cumulative vibration amplitude of N=32 (32 polygons) increases significantly from time P1 to time P3.

[0066] If operation is continued from point P3 without changing the operating conditions, the polygonalization index and vibration level index will further increase, as shown in P4. Also, as shown in Fig. 10, the cumulative vibration amplitude of N = 32 (32-sided polygon) will further increase, and there is a risk that the 32-sided polygonization of the work roll 3 will progress significantly.

[0067] Therefore, in one embodiment, when both the polygonalization index and the vibration level index exceed their thresholds, as at P3, the operating conditions of the rolling mill 2 are determined so that the polygonalization index and the vibration level index decrease. For example, the rotational speed of the rolls 3 is changed to a different speed than the rotational speed up to P3. The changed rotational speed may be higher or lower than the rotational speed up to P3. The control unit 64 changes the operating conditions based on the determined operating conditions. For example, the motor current value for driving the rolls 3 is changed so that the determined rotational speed of the rolls 3 is achieved. As a result, the polygonalization index and the vibration level index decrease, as shown at P5, for example. As shown in FIG. 10E, at the time point P5, the cumulative vibration amplitude for N=32 (32-gon) is smaller than at the time point P3 (FIG. 10C), indicating that the 32-gon formation has regressed.

[0068] In this way, by determining and changing the operating conditions based on the polygonalization index and / or the vibration level index, it is possible to effectively suppress polygonalization of the rolls 3. This allows the rolls 3 to be used for a longer period of time, or to suppress equipment failures caused by vibration.

[0069] In some embodiments, instead of the vibration level index obtained in step S12, a corrected vibration level index obtained based on the vibration level may be used to evaluate the state of the rolling mill 2 (i.e., in steps S14 and S16, the corrected vibration level index may be used instead of the vibration level index). Here, the corrected vibration level index is obtained by dividing the vibration level index by at least one parameter that has a correlation with the vibration of the work rolls 3.

[0070] The corrected vibration level index may be, for example, the vibration level index obtained in step S12 divided by the rolling load or reduction in the rolling mill 2, or the vibration level index obtained in step S12 divided by the product of the rolling load and the reduction. More specifically, the corrected vibration level index may be the acceleration of the rolling roll divided by the product of the rolling load and the reduction (acceleration / (rolling load x reduction)).

[0071] The vibration level of the rolling rolls 3 can be affected by the rolling conditions. For example, the vibration level of the rolling rolls 3 tends to increase under more severe rolling conditions. For this reason, if the rolling conditions are not taken into consideration, it may be impossible to determine whether the reason for an increase in the vibration level index is due to severe rolling conditions or equipment failure, and there is a risk that the condition of the rolling rolls 3 cannot be appropriately evaluated.

[0072] In this regard, according to the above-described embodiment, a corrected vibration level index is obtained by dividing the vibration level index by a parameter that has a correlation with the vibration of the rolling roll 3. Therefore, based on the polygonal index and the corrected vibration level index, the state of the rolling roll can be appropriately evaluated even when the rolling conditions change.

[0073] FIG. 11 is a diagram showing an example of an evaluation map similar to FIG. 8, and shows the difference between a case where a vibration level index (not corrected based on the rolling conditions) is used (Example 1) and a case where a corrected vibration level index corrected based on the rolling conditions is used (Example 2).

[0074] In Case 1 of Figure 11, when the vibration level index was used (Example 1), the horizontal axis belonged to region (c) where it is small, but this is because the rolling conditions were actually easy, and by using the corrected vibration level index (Example 2), the horizontal axis belonged to region (d) where it is large, making it possible to detect the occurrence of vibrations that are larger than the acceleration expected under the same conditions. In Case 2 of Figure 11, when the vibration level index was used (Example 1), the horizontal axis belonged to region (region b), but this is because the rolling conditions were actually severe, and by using the corrected vibration level index (Example 2), the horizontal axis belonged to region (a) where it is small, indicating that there are no problems with the equipment.

[0075] The contents described in each of the above embodiments can be understood, for example, as follows.

[0076] (1) A monitoring and control device (50) for a rolling mill (2) according to at least one embodiment of the present invention comprises: A monitoring and control device for monitoring or controlling a rolling mill, a vibration data acquisition unit (52) configured to acquire vibration data indicating vibration of the rolling rolls (3) of the rolling mill during rolling of the metal sheet (S) in the rolling mill; a cumulative vibration amplitude acquisition unit (54) configured to acquire, for each of a plurality of polygonal numbers N of the rolling roll, a cumulative vibration amplitude which is the sum of the amplitudes of the vibrations at frequencies corresponding to the polygonal number N for each rotation number of the rolling roll from the vibration data; a first index acquisition unit (56) configured to acquire a polygonal index indicating a magnitude of variation in the cumulative vibration amplitude obtained corresponding to each of the plurality of polygon numbers N; an evaluation unit (60) configured to evaluate the state of the rolling mill based on the polygonal index; Equipped with.

[0077] According to the above-mentioned configuration (1), a cumulative vibration amplitude for each of a plurality of polygonal numbers N is calculated based on vibration data indicating the vibration of the rolling roll during operation of the rolling mill, and a polygonalization index indicating the degree of variation in the cumulative vibration amplitude is obtained from the cumulative vibration amplitude for each of the plurality of polygonal numbers N. A large polygonalization index indicates that the shape of the rolling roll is being changed to a specific N-sided shape. Therefore, the polygonalization state of the rolling roll can be appropriately evaluated based on this polygonalization index. Here, the rotational speed of the rolling roll does not need to be constant when acquiring the vibration data. In other words, according to the above-mentioned configuration (1), even if the rotational speed of the rolling roll changes during rolling or without preparing a database in advance, the polygonalization of the rolling roll can be appropriately evaluated based on the vibration data during rolling. Therefore, the polygonalization of the rolling roll can be more easily evaluated.

[0078] (2) In some embodiments, in the configuration of (1), The evaluation unit is configured to evaluate a state of the rolling mill based on a comparison between the polygonal index and a threshold value.

[0079] A large polygonalization index indicates that the shape of the rolling roll is changing to a specific N-gon. According to the configuration (2) above, the state of the rolling mill (the state of polygonalization of the rolling roll) can be easily and appropriately evaluated based on a comparison between the polygonalization index and a threshold value.

[0080] (3) In some embodiments, in the configuration of (1) or (2), The monitoring and control device includes: a second index acquisition unit (58) configured to acquire, from the vibration data, a vibration level index indicating a vibration level of the rolling roll during the rolling of the metal plate; Equipped with The evaluation unit is configured to evaluate a state of the rolling mill based on the polygonal index and the vibration level index.

[0081] According to the configuration (3) above, a vibration level index indicating the vibration level of the rolling roll is obtained in addition to the polygonal index described in (1) above based on the vibration data of the rolling roll. Therefore, the condition of the rolling roll can be easily and more precisely evaluated based on the polygonal index and the vibration level index.

[0082] (4) In some embodiments, in the configuration of (3), The evaluation unit is configured to evaluate the condition of the rolling mill based on the polygonal index and a corrected vibration level index obtained by dividing the vibration level index by at least one parameter correlated with the vibration of the rolling roll.

[0083] The vibration level of a rolling roll can be affected by the rolling conditions. For example, the vibration level of a rolling roll tends to increase under more severe rolling conditions. In this regard, according to the configuration of (4) above, a corrected vibration level index is obtained by dividing the vibration level index by a parameter correlated with the vibration of the rolling roll. Therefore, even when the rolling conditions change, the state of the rolling roll can be appropriately evaluated based on the polygonal index and the corrected vibration level index.

[0084] (5) In some embodiments, in the configuration of (3) or (4), The vibration level indicator includes an indicator indicating the magnitude of acceleration of the reduction roll.

[0085] According to the above configuration (5), a vibration level index indicating the magnitude of the acceleration of the roll is obtained based on the vibration data of the roll. Therefore, the condition of the roll can be easily and more precisely evaluated based on the polygonal index and the vibration level index.

[0086] (6) In some embodiments, in the configuration of (3) or (4), The vibration level indicator includes an indicator indicating the magnitude of displacement of the rolling roll.

[0087] According to the above configuration (6), a vibration level index indicating the magnitude of displacement of the roll is obtained based on the vibration data of the roll. Therefore, the condition of the roll can be easily and more precisely evaluated based on the polygonal index and the vibration level index.

[0088] (7) In some embodiments, in any of the configurations (3) to (6) above, The monitoring and control device includes: The apparatus further includes a display unit (68) configured to display an evaluation map showing the correlation between the polygonal index and the vibration level index obtained from the vibration data.

[0089] According to the configuration of (7) above, a map showing the correlation between the polygonal index and the vibration level index obtained from the vibration data is displayed, so that the condition of the rolling roll can be easily evaluated based on the map.

[0090] (8) In some embodiments, in any of the configurations (1) to (7) above, The monitoring and control device includes: An operating condition determination unit (62) configured to determine operating conditions of the rolling mill so that the polygonal index does not exceed a threshold value.

[0091] According to the above configuration (8), the operating conditions of the rolling mill are determined so that the polygonal index does not exceed the threshold value, so that the growth of a specific N-gonal shape in the rolling rolls can be suppressed.

[0092] (9) In some embodiments, in any of the configurations (1) to (8) above, The monitoring and control device includes: a second index acquisition unit (58) configured to acquire, from the vibration data, a vibration level index indicating a vibration level of the rolling roll during the rolling of the metal plate; an operating condition determination unit (62) configured to determine operating conditions of the rolling mill so that the vibration level index does not exceed a threshold; Equipped with.

[0093] According to the above configuration (9), the operating conditions of the rolling mill are determined so that the vibration level index does not exceed the threshold value, so that the vibration level of the rolling rolls can be prevented from becoming excessive.

[0094] (10) At least one embodiment of the rolling equipment (1) of the present invention comprises: a rolling mill (2) including rolls for rolling a metal plate; The monitoring and control device (50) according to any one of (1) to (9) above, configured to evaluate the condition of the rolling roll; Equipped with.

[0095] According to the above-mentioned configuration (10), a cumulative vibration amplitude for each of a plurality of polygonal numbers N is calculated based on vibration data indicating the vibration of the rolling roll during operation of the rolling mill, and a polygonalization index indicating the degree of variation in the cumulative vibration amplitude is obtained from the cumulative vibration amplitude for each of the plurality of polygonal numbers N. A large polygonalization index indicates that the shape of the rolling roll is progressing to a specific N-sided shape. Therefore, the polygonalization state of the rolling roll can be appropriately evaluated based on this polygonalization index. Here, the rotational speed of the rolling roll does not need to be constant when acquiring the vibration data. In other words, according to the above-mentioned configuration (10), even if the rotational speed of the rolling roll changes during rolling or without preparing a database in advance, the polygonalization of the rolling roll can be appropriately evaluated based on the vibration data during rolling. Therefore, the polygonalization of the rolling roll can be more easily evaluated.

[0096] (11) A method for monitoring and controlling a rolling mill according to at least one embodiment of the present invention includes: A monitoring and control method for monitoring or controlling a rolling mill (1), comprising: a step (S4) of acquiring vibration data indicating vibration of the rolling rolls (3) of the rolling mill during rolling of the metal plate (S) in the rolling mill; Steps (S6 to S8) for each of the plurality of polygonal numbers N of the rolling roll, acquiring from the vibration data a cumulative vibration amplitude which is the sum of the amplitudes of the vibrations at frequencies corresponding to the polygonal number N for each rotation number of the rolling roll; A step (S10) of acquiring a polygonalization index indicating a degree of variation in the cumulative vibration amplitude obtained corresponding to each of the plurality of polygon numbers N; Steps (S14 to S16) of evaluating the state of the rolling mill based on the polygonal index; Equipped with.

[0097] According to the method of (11) above, a cumulative vibration amplitude for each of a plurality of polygonal numbers N is calculated based on vibration data indicating the vibration of a rolling roll during operation of a rolling mill, and a polygonalization index indicating the degree of variation in the cumulative vibration amplitude is obtained from the cumulative vibration amplitude for each of the plurality of polygonal numbers N. A large polygonalization index indicates that the shape of the rolling roll is being changed to a specific N-sided shape. Therefore, the polygonalization state of the rolling roll can be appropriately evaluated based on this polygonalization index. Here, the rotational speed of the rolling roll does not need to be constant when acquiring the vibration data. In other words, according to the method of (11) above, even if the rotational speed of the rolling roll changes during rolling or without preparing a database in advance, the polygonalization of the rolling roll can be appropriately evaluated based on the vibration data during rolling. Therefore, the polygonalization of the rolling roll can be more easily evaluated.

[0098] (12) A monitoring and control program for a rolling mill according to at least one embodiment of the present invention includes: A monitoring and control program for monitoring or controlling a rolling mill (2), On the computer, a step of acquiring vibration data indicating vibration of the rolling rolls (3) of the rolling mill during rolling of the metal plate (S) in the rolling mill; a step of acquiring, for each of a plurality of polygonal numbers N of the rolling roll, a cumulative vibration amplitude which is a sum of amplitudes of the vibration at frequencies corresponding to the polygonal number N for each rotation number of the rolling roll from the vibration data; a step of acquiring a polygonalization index indicating a degree of variation in the cumulative vibration amplitude obtained corresponding to each of the plurality of numbers of polygons N; evaluating the condition of the rolling mill based on the polygonal index; Execute the following.

[0099] According to the configuration of (12) above, a cumulative vibration amplitude for each of a plurality of polygonal numbers N is calculated based on vibration data indicating the vibration of the rolling roll during operation of the rolling mill, and a polygonalization index indicating the degree of variation in the cumulative vibration amplitude is obtained from the cumulative vibration amplitude for each of the plurality of polygonal numbers N. A large polygonalization index indicates that the shape of the rolling roll is being changed to a specific N-sided shape. Therefore, the polygonalization state of the rolling roll can be appropriately evaluated based on this polygonalization index. Here, the rotational speed of the rolling roll does not need to be constant when acquiring the vibration data. In other words, according to the configuration of (12) above, even if the rotational speed of the rolling roll changes during rolling or without preparing a database in advance, the polygonalization of the rolling roll can be appropriately evaluated based on the vibration data during rolling. Therefore, the polygonalization of the rolling roll can be more easily evaluated.

[0100] The above describes an embodiment of the present invention, but the present invention is not limited to the above-described embodiment, and also includes forms in which the above-described embodiment is modified, or forms in which these forms are appropriately combined.

[0101] In this specification, expressions expressing relative or absolute arrangement such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only express such an arrangement strictly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions such as "identical," "equal," and "homogeneous" that indicate that something is in an equal state not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. Furthermore, in this specification, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent rectangular shapes or cylindrical shapes in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained. Furthermore, in this specification, the expressions "comprise," "include," or "have" a component are not exclusive expressions that exclude the presence of other components. [Explanation of symbols]

[0102] 1. Rolling equipment 2. Rolling equipment 3. Rolling mill 4A work roll 4B work roll 5A Roll Chock 5B Roll Chock 6A Backup Roll 6B Backup Roll 7A Roll Chock 7B Roll Chock 8. Screw-down device 10, 10A~10C Rolling Stand 50 Monitoring and control device 52 Vibration data acquisition unit 54 Accumulative vibration amplitude acquisition unit 56 1st index acquisition part 58 Second index acquisition part 60 Evaluation Department 62 Operating condition determination unit 64 Control Unit 66 Output section 68 Display section 70 Motor 90 Vibration measurement unit 91~94 Acceleration sensor 96 Rotational speed measurement unit S Metal plate

Claims

1. A monitoring and control device for monitoring or controlling a rolling mill, a vibration data acquisition unit configured to acquire vibration data indicating vibration of the rolling rolls of the rolling mill during rolling of the metal plate in the rolling mill; a cumulative vibration amplitude acquiring unit configured to acquire, for each of a plurality of polygonal numbers N of the rolling roll, a cumulative vibration amplitude which is a sum of amplitudes of the vibrations at frequencies corresponding to the polygonal number N for each rotation number of the rolling roll from the vibration data; a first index acquisition unit configured to acquire a polygonal index indicating a magnitude of variation in the cumulative vibration amplitude obtained corresponding to each of the plurality of polygon numbers N; an evaluation unit configured to evaluate a state of the rolling mill based on the polygonal index; A monitoring and control device for a rolling mill comprising:

2. The evaluation unit is configured to evaluate a state of the rolling mill based on a comparison between the polygonal index and a threshold value. The monitoring and control device for a rolling mill according to claim 1.

3. a second index acquisition unit configured to acquire, from the vibration data, a vibration level index indicating a vibration level of the rolling roll during the rolling of the metal plate; The evaluation unit is configured to evaluate a state of the rolling mill based on the polygonal index and the vibration level index. The monitoring and control device for a rolling mill according to claim 1 or 2.

4. The evaluation unit is configured to evaluate the state of the rolling mill based on the polygonal index and a corrected vibration level index obtained by dividing the vibration level index by at least one parameter correlated with vibration of the rolling roll. The monitoring and control device for a rolling mill according to claim 3.

5. The vibration level indicator includes an indicator indicating the magnitude of acceleration of the rolling roll. The monitoring and control device for a rolling mill according to claim 3 or 4.

6. The vibration level indicator includes an indicator indicating the magnitude of displacement of the rolling roll. The monitoring and control device for a rolling mill according to claim 3 or 4.

7. a display unit configured to display an evaluation map showing a correlation between the polygonal index and the vibration level index obtained from the vibration data; The monitoring and control device for a rolling mill according to any one of claims 3 to 6.

8. an operating condition determination unit configured to determine operating conditions of the rolling mill so that the polygonal index does not exceed a threshold value; The monitoring and control device for a rolling mill according to any one of claims 1 to 7.

9. a second index acquisition unit configured to acquire, from the vibration data, a vibration level index indicating a vibration level of the rolling roll during the rolling of the metal plate; an operating condition determination unit configured to determine operating conditions of the rolling mill so that the vibration level index does not exceed a threshold; Equipped with The monitoring and control device for a rolling mill according to any one of claims 1 to 8.

10. a rolling device including a rolling roll for rolling a metal plate; A monitoring and control device according to any one of claims 1 to 9, configured to evaluate the condition of the rolls; Rolling equipment equipped with:

11. A monitoring and control method for monitoring or controlling a rolling mill, comprising: acquiring vibration data indicating vibration of rolls of the rolling mill during rolling of the metal plate in the rolling mill; A step of acquiring, for each of a plurality of polygonal numbers N of the rolling roll, a cumulative vibration amplitude which is a sum of amplitudes of the vibration at frequencies corresponding to the polygonal number N for each rotation number of the rolling roll from the vibration data; obtaining a polygonalization index indicating a degree of variation in the cumulative vibration amplitude obtained corresponding to each of the plurality of numbers of polygons N; evaluating the condition of the rolling mill based on the polygonal index; A monitoring and control method for a rolling mill comprising:

12. A monitoring and control program for monitoring or controlling a rolling mill, On the computer, acquiring vibration data indicating vibration of rolls of the rolling mill during rolling of the metal plate in the rolling mill; a step of acquiring, for each of a plurality of polygonal numbers N of the rolling roll, a cumulative vibration amplitude which is a sum of amplitudes of the vibration at frequencies corresponding to the polygonal number N for each rotation number of the rolling roll from the vibration data; obtaining a polygonalization index indicating a degree of variation in the cumulative vibration amplitude obtained corresponding to each of the plurality of numbers of polygons N; evaluating the condition of the rolling mill based on the polygonal index; A monitoring and control program for rolling equipment for executing the above.

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