JP7743340B2 - Rolling equipment monitoring and control device, rolling equipment, rolling equipment monitoring and control method, and rolling equipment monitoring and control program - Google Patents

Description

This disclosure relates to 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.

When rolling materials such as metal plates continues in a rolling mill containing rolls, wear occurs as the rolls and the rolled material rotate in contact with each other, which can cause the roll's cross-sectional shape to approach a specific N-gon, resulting in polygonalization of the roll. When N-gonalization of rolls occurs and grows, irregularities corresponding to the N-gon shape 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. Polygonalization of rolls also increases vibration levels, which can damage the rolling equipment itself. Therefore, it is desirable to properly understand the trend in the growth of N-gonalization of rolls and, if possible, avoid polygonalization.

Patent Document 1 describes a method for calculating a characteristic value σ, which indicates an index of the 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, and for evaluating the tendency of the rolling roll to become N-gonalized based on this characteristic value σ.

International Publication No. 2021/024447

The rolling mill evaluation method described in Patent Document 1 is applicable to rolling at a constant roll rotation speed, and cannot be applied when the rolling speed changes. Furthermore, the method described in Patent Document 1 requires the advance acquisition of a database showing the correlation between the roll rotation speed and the characteristic value σ in order to evaluate the polygonal shape of the roll. Furthermore, this database is based on 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 a variety of conditions.

In light of the above, 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 polygonal shape of rolling rolls.

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.

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.

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 vibrations 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.

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;
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;
Execute the following.

At least one embodiment of the present invention provides a rolling mill monitoring and control device, rolling equipment, a rolling mill monitoring and control method, and a rolling mill monitoring and control program that can more easily evaluate the polygonal shape of rolling rolls.

FIG. 1 is a schematic diagram of rolling equipment according to an embodiment. FIG. 1 is a schematic configuration diagram of a monitoring control device according to an embodiment; 1 is a schematic flowchart of a monitoring and control method for a rolling mill according to an embodiment. 1 is a chart showing an example of the results of time-frequency analysis of vibration data of a rolling roll obtained during rolling. 10 is a graph showing an example of an analysis result of the time history of the magnitude of the vibration level for each polygon number N (order). 10 is a graph showing an example of cumulative vibration amplitude for each number N of polygons. 10 is a graph showing an example of the coefficient of variation of the cumulative vibration amplitude. 10 is an example of an evaluation map showing the correlation between a polygonal index and a vibration level index. 10A and 10B are diagrams for explaining time-series changes in a polygonal index and a vibration level index. 10 is a graph showing the cumulative vibration amplitude at P1 in the map of FIG. 9 . 10 is a graph showing the cumulative vibration amplitude at P2 in the map of FIG. 9 . 10 is a graph showing the cumulative vibration amplitude at P3 in the map of FIG. 9 . 10 is a graph showing the cumulative vibration amplitude at P4 in the map of FIG. 9 . 10 is a graph showing the cumulative vibration amplitude at P5 in the map of FIG. 9 . 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. FIG. 1 is a schematic diagram of a rolling mill in which N-gonalization of rolls occurs.

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

(Configuration of rolling equipment)
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 rolls 3 constituting the rolling stand 10.

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, and a housing (not shown). The reduction device 8 may include a hydraulic cylinder.

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. 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 a housing (not shown).

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 (e.g., 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 indicating the above-mentioned vibrations detected by the acceleration sensors 91-94 are sent to the monitoring and control device 50.

In another embodiment, the vibration measurement unit 90 may include a displacement detection 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 detection unit. For example, a laser-type or eddy current-type displacement meter may be used as the displacement detection unit. Alternatively, an imaging device (camera, etc.) may be used as the displacement detection 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 image data.

Figure 2 is a schematic diagram of a monitoring and control device 50 according to one embodiment. As will be described in detail later, the monitoring and control device 50 is configured to evaluate the polygonal (N-gonal) state of the roll 3.

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

As shown in FIG. 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.

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

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

The first index acquisition unit 56 is configured to acquire a polygonization index that indicates the degree of variation in the cumulative vibration amplitude obtained for each of the multiple numbers of corners N.

The second index acquisition unit 58 is configured to acquire a vibration level index indicating the vibration level of the rolling roll 3 during rolling of the metal sheet S from the vibration data acquired by the vibration data acquisition unit 52.

The evaluation unit 60 is configured to evaluate the condition of the rolling roll 3 based on the polygonalization index and/or vibration level index described above.

The operating condition determination unit 62 is configured to determine the operating conditions of the rolling device 2 (e.g., the rotational speed of the rolling rolls 3, etc.) based on, for example, the evaluation results by the evaluation unit 60.

The control unit 64 controls the rolling mill 2 to achieve 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 rolling rolls 3 in order to control the rotational speed of the rolling rolls 3.

The monitoring and control device 50 includes a computer equipped with a processor (CPU, GPU, etc.), a storage device (memory device; RAM, etc.), an auxiliary storage unit, an interface, etc. The monitoring and control device 50 receives signals from various measuring instruments (such as the vibration measurement unit 90 or 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 described below (such as the vibration data acquisition unit 52, cumulative vibration amplitude acquisition unit 54, first index acquisition unit 56, second index acquisition unit 58, evaluation unit 60, operating condition determination unit 62, and control unit 64).

The processing content of the monitoring and control device 50 is implemented as a program executed by the processor. The program may be stored in an auxiliary memory unit. When the program is executed, it is deployed in the storage device. The processor reads the program from the storage device and executes the instructions contained in the program.

As the metal sheet S continues to be rolled in the rolling mill 2 described above, N-gonalization, in which the cross-sectional shape of the rolls 3 approaches a specific N-gon, may occur. Figure 12 is a schematic diagram of a rolling mill in which N-gonalization of the rolls 3 occurs. The rolling mill 2 shown in Figure 12 includes multiple rolling stands 10A-10C. The cross-sectional shape perpendicular to the axial direction of the rolls 3 is typically circular, as with the rolls 3 of roll stand 10A or 10C. However, the cross-sectional shape of the rolls 3 (work rolls 4A, 4B and backup rolls 6A, 6B) of roll stand 10B shown in Figure 12 is an N-gon (specifically, a dodecagon), and N-gonalization has occurred in these rolls 3.

When N-gonalization of the rolling rolls 3 occurs and grows, irregularities corresponding to the N-gonal shape of the rolling rolls 3 are formed on the surface of the metal sheet S rolled by the rolling rolls 3, which can cause problems in terms of product quality. Therefore, it is desirable to properly understand the state of N-gonalization of the rolling rolls 3 and prevent deterioration in the quality of the product metal sheet.

Note that Figure 12 shows a schematic diagram of dodecagonalization (N = 12) occurring on each roll 3, but in an actual rolling mill, N-gons (N = 50 or 100) may occur on the roll 3, depending on operating conditions such as the rotation speed of the roll 3.

Furthermore, depending on the operating conditions and specifications (natural frequency, etc.) of the rolling mill 2, N-gonalization of the rolls 3 may occur 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 that make up a single 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. Furthermore, 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.

(Monitoring control flow of rolling mill)
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 another device or manually.

Figure 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 in Figure 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 during the rolling of the metal sheet S.

In the method shown in the flowchart of Figure 3, first, the first coil (metal sheet S) is rolled using the rolling mill 2 (S2).

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

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

Figure 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 Figure 4 represents time, and the vertical axis represents vibration frequency. The color intensity represents the magnitude of the vibration level, with darker colors indicating stronger vibration. Figure 4 also shows the results of frequency analysis of vibration data obtained when rolling a coil while increasing the rotational speed of the mill roll 3 from 90 rpm to 150 rpm over a period of approximately 90 seconds, divided into vibration data for each predetermined period (e.g., every second).

In the graph of Figure 4, strong vibrations (accelerations) occur at frequencies of approximately 70 to 80 Hz throughout the rolling period. Furthermore, the frequency of vibrations resulting from the shape (N-gon) 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, it can be inferred that at a rotational speed of approximately 90 rpm (approximately 1.5 Hz) immediately after the start of rolling, strong vibrations indicate a 47-53 gon (N = 47-53) shape, while at a rotational speed of approximately 150 rpm (approximately 2.5 Hz) immediately before the end of rolling, strong vibrations indicate a 28-32 gon (N = 28-32) shape. It can be inferred that polygonalization of the roll occurs in each time period, corresponding to the N number.

Next, the cumulative vibration amplitude acquisition unit 54 acquires, for each of the multiple polygon 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 polygon number N for each rotation number i of the rolling roll 3 from the start to the end of one rolling cycle (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 if N is the polygon 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), and the vibration amplitude in the ith rotation of the polygon number N (N polygon) is denoted as A _N,i , the cumulative vibration amplitude can be expressed as ΣA _N,i .

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).

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

The cumulative vibration amplitude can 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 there is a one-to-one correspondence between the number of rotations i and time, a graph can be created showing 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.

Next, the first index acquirer 56 acquires a polygonalization index indicating the magnitude of variation in the multiple cumulative vibration amplitudes ΣA _N,i obtained corresponding to the multiple polygon numbers N acquired in step S8 (S10). The polygonalization index may be the coefficient of variation (standard deviation divided by average value) of the multiple cumulative vibration amplitudes ΣA _N,i . Fig. 7 is a graph showing the coefficient of variation of the cumulative vibration amplitudes ΣA _N,i for each coil whose cumulative vibration amplitudes are shown in Fig. 6.

6 for coil E, which has a relatively large coefficient of variation of the cumulative vibration amplitude ΣA _N,i in FIG. 7 , a peak of the cumulative vibration amplitude exists near N=30 (tridecagon), and the cumulative vibration amplitude is relatively small in other regions of the number of polygons N (for example, when N is 25 or less or 35 or more). This indicates that the degree of tridecagonization increases in the work rolls 3 of the rolling mill 2 during rolling of coil E. It also indicates that the state of polygonization of the work 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 is possible to determine whether polygonization has progressed to an unacceptable level.

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 rolling 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 rolling roll is undergoing a shape transformation into 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 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 rolling roll 3 changes during rolling, or without preparing a database in advance, the polygonalization of the rolling roll 3 can be appropriately evaluated based on the vibration data during rolling. Therefore, the polygonalization of the rolling roll 3 can be easily evaluated.

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).

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

If the vibration level index is large, it can be determined that the vibration of the rolling roll 3 is increasing. For example, based on a comparison of the vibration level index with a threshold value, it can be determined whether the vibration level of the rolling roll 3 is within the allowable range.

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 shows the correlation between the polygonal index and the vibration level index. The condition of the rolling roll 3 can be evaluated based on this evaluation map.

Fig. 8 is an example of an evaluation map showing the correlation between the polygonal index (I _P ) (vertical axis) and the vibration level index (I _V ) (horizontal axis). Each of the multiple plots in the evaluation map in Fig. 8 shows the values of the polygonal index and the vibration level index obtained based on 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.

The map in FIG. 8 is divided into four regions (regions (a) to (d)) based on the polygonal index threshold I _{P — th} and the vibration level index threshold I _{v — th} .

Region (a) is a region where the polygonalization index is less than the threshold value I _{P_th} and the vibration level index is less than the threshold value I _{v_th} . If the plots of the polygonalization index and vibration level are in region (a), at the time of rolling the coil, the polygonalization of the roll 3 has not progressed to an unacceptable extent and the vibration is relatively small, so it can be evaluated that there is no problem with the rolling device 2 and the roll 3 can continue to be used.

Region (b) is a region where the polygonalization index is less than the threshold value I _{P_th} and the vibration level index is equal to or greater than the threshold value I _{v_th} . If the plots of the polygonalization index and vibration level are in region (b), the polygonalization of the roll 3 has not progressed to an unacceptable extent at the time of rolling of the coil, but the vibration is relatively large, so it can be evaluated that, for example, although the use of the roll 3 can continue, there is a risk of a problem occurring in the rolling device 2.

Region (c) is a region where the polygonalization index is equal to or greater than the threshold value I _{P_th} and the vibration level index is less than the threshold value I _{v_th} . When the plots of the polygonalization index and vibration level are 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 extent, 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.

Region (d) is a region where the polygonal index is equal to or greater than the threshold value I _{P_th} and the vibration level index is equal to or greater than the threshold value I _{v_th} . If the plots of the polygonal index and vibration level are in region (d), the vibration is relatively large at the time of rolling of the coil, and the polygonal shape of the mill roll 3 has progressed to an unacceptable extent, so it can be evaluated that, for example, the mill roll 3 needs to be replaced.

The evaluation map obtained in step S14 may be displayed on the display unit 68 (e.g., a display).

Next, the operating condition determination unit 62 compares the polygonalization index obtained in step S10 with a threshold value (S16). If the polygonalization 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 polygonalization index does not exceed the threshold value. The control unit 64 also changes the operating conditions of the rolling mill 2 (e.g., the rotation speed of the rolling rolls 3) so as to satisfy the determined operating conditions.

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. The control unit 64 then changes the operating conditions of the rolling mill 2 (e.g., the rotation speed of the rolling rolls 3) to satisfy the determined operating conditions (S18), and rolls the next coil (S20).

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 thresholds (S16). If both the polygonalization index and the vibration level index are equal to or greater than the thresholds (No in S16), the operating conditions of the rolling device 2 may be determined so that the polygonalization index does not exceed the thresholds. Furthermore, the control unit 64 may change the operating conditions of the rolling device 2 (e.g., the rotation speed of the rolling rolls 3) to satisfy the determined operating conditions.

Note that the comparison of the polygonization index and/or vibration level index with the threshold value in step S16 may use the evaluation map created in step S14.

Figure 9 is a diagram illustrating the time-series changes in the polygonal index and vibration level index for a certain rolling roll 3. Figure 9 is a map similar to the evaluation map shown in Figure 8, with P1 to P5 in the map representing the polygonal index and vibration level index at different times (or different coils). Figures 10A to 10E are graphs showing the cumulative vibration amplitude for each number of corners N, obtained during the process of calculating the polygonal index for P1 to P5 in the map of Figure 9.

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 vibration level index are below the threshold, but at P2 the polygonalization index exceeds the threshold, and at P3 both the polygonalization index and vibration level index exceed the threshold. Unless the operating conditions of rolling equipment 1 are changed, the polygonalization index and vibration level index will normally increase gradually in this manner. Furthermore, referring to the graphs in Figures 10A to 10C, it can be seen that the cumulative vibration amplitude for N = 32 (32-sided polygon) increases significantly from time P1 to time P3.

If operation continues from point P3 without changing the operating conditions, the polygonalization index and vibration level index will further increase, as shown in P4. Furthermore, as shown in Figure 10, the cumulative vibration amplitude for N = 32 (32-sided polygon) will become even larger, and there is a risk that the 32-sided shape of the rolling roll 3 will progress significantly.

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 rolling rolls 3 is changed to a different speed than the rotational speed up to P3. Note that 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 rolling rolls 3 is changed so that the determined rotational speed of the rolling 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 Figure 10E, at time P5, the cumulative vibration amplitude for N = 32 (32-gon) is smaller than at time P3 (Figure 10C), indicating that 32-gon formation has regressed.

In this way, by determining and changing operating conditions based on the polygonalization index and/or vibration level index, polygonalization of the roll 3 can be effectively suppressed. This allows the roll 3 to be used for a longer period of time, and also suppresses equipment failure caused by vibration.

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 is correlated with the vibration of the rolling roll 3.

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 device 2, or the vibration level index obtained in step S12 divided by the product of the rolling load and 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 reduction (acceleration/(rolling load x reduction)).

The vibration level of the rolling roll 3 can be affected by the rolling conditions. For example, under more severe rolling conditions, the vibration level of the rolling roll 3 tends to increase. For this reason, if the rolling conditions are not taken into consideration, it may be impossible to determine, for example, whether a high vibration level index is due to severe rolling conditions or equipment failure, and the condition of the rolling roll 3 may not be properly evaluated.

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 condition of the rolling roll can be appropriately evaluated even when the rolling conditions change.

Figure 11 is a diagram showing an example of an evaluation map similar to Figure 8, illustrating the difference between using a vibration level index (not corrected based on rolling conditions) (Example 1) and using a corrected vibration level index corrected based on rolling conditions (Example 2).

In Case 1 of Figure 11, when the vibration level index was used (Example 1), the horizontal axis belonged to the small region (c). However, this was because the rolling conditions were actually easy. By using the corrected vibration level index (Example 2), the horizontal axis belonged to the large region (d), making it possible to detect 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 the large region (region b). However, this was because the rolling conditions were actually harsh. By using the corrected vibration level index (Example 2), the horizontal axis belonged to the small region (a), indicating that there are no problems with the equipment.

The contents described in each of the above embodiments can be understood, for example, as follows:

(1) A monitoring and control device (50) for a rolling mill (2) 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 (52) configured to acquire 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 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.

According to the above configuration (1), the cumulative vibration amplitude for each of multiple polygonal numbers N is calculated based on vibration data indicating the vibration of the rolling roll during operation of the rolling mill. A polygonalization index indicating the degree of variation in the cumulative vibration amplitude is obtained from the cumulative vibration amplitude for each of the multiple polygonal numbers N. A large polygonalization index indicates that the rolling roll is undergoing a shape transformation into 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 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. This makes it possible to more easily evaluate the polygonalization of the rolling roll.

(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.

A large polygonalization index indicates that the shape of the rolling roll is changing to a specific N-sided polygon. 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 of the polygonalization index with a threshold value.

(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.

According to the configuration (3) above, in addition to the polygonal index described in (1) above, a vibration level index indicating the vibration level of the rolling roll is obtained 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.

(4) In some embodiments, in the configuration of (3),
The evaluation unit is configured to evaluate the condition of the rolling device based on the polygonization 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.

The vibration level of a rolling roll can be affected by the rolling conditions. For example, under more severe rolling conditions, the vibration level of the rolling roll tends to increase. In this regard, the configuration described in (4) above obtains a corrected vibration level index obtained by dividing the vibration level index by a parameter that has a correlation with the vibration of the rolling roll. Therefore, based on the polygonal index and the corrected vibration level index, the condition of the rolling roll can be appropriately evaluated even when the rolling conditions change.

(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.

According to the above configuration (5), a vibration level index indicating the magnitude of the acceleration of the rolling roll is obtained 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.

(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.

According to the above configuration (6), a vibration level index indicating the magnitude of the displacement of the rolling roll is obtained 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.

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

According to the configuration (7) above, a map showing the correlation between the polygonal index and the vibration level index obtained from the vibration data is displayed, making it possible to easily evaluate the condition of the rolling rolls based on this map.

(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 is provided.

According to the configuration (8) above, the operating conditions of the rolling mill are determined so that the polygonalization index does not exceed the threshold value, thereby suppressing the growth of specific N-gonalization in the rolling rolls.

(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.

According to the configuration (9) above, the operating conditions of the rolling mill are determined so that the vibration level index does not exceed the threshold value, thereby preventing the vibration level of the rolling rolls from becoming excessive.

(10) At least one embodiment of the rolling equipment (1) of the present invention comprises:
a rolling device (2) including rolling 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 state of the rolling roll;
Equipped with.

According to the above configuration (10), the 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. 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 rolling roll is undergoing a shape transformation into 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 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. This makes it possible to more easily evaluate the polygonalization of the rolling roll.

(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 a 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 magnitude of variation in the cumulative vibration amplitude obtained corresponding to each of the plurality of numbers of polygons N;
Steps (S14 to S16) of evaluating the state of the rolling mill based on the polygonal index;
Equipped with.

According to the method (11) 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 rolling roll during operation of the rolling mill. 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 rolling roll is undergoing a shape transformation into 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 (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. This makes it possible to more easily evaluate the polygonalization of the rolling roll.

(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 a rolling roll (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;
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;
Execute the following.

According to the above configuration (12), the 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. 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 rolling roll is undergoing a shape transformation into 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 configuration (12), 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. This makes it possible to more easily evaluate the polygonalization of the rolling roll.

The above describes embodiments of the present invention, but the present invention is not limited to the above-described embodiments and also includes modifications to the above-described embodiments and appropriate combinations of these embodiments.

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.

1 Rolling equipment 2 Rolling mill device 3 Rolling roll 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 to 10C Rolling stand 50 Monitoring control device 52 Vibration data acquisition unit 54 Accumulative vibration amplitude acquisition unit 56 First index acquisition unit 58 Second index acquisition unit 60 Evaluation unit 62 Operating condition determination unit 64 Control unit 66 Output unit 68 Display unit 70 Motor 90 Vibration measurement unit 91 to 94 Acceleration sensor 96 Rotation speed measurement unit S Metal plate

Claims (12)

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: The monitoring and control device for a rolling mill according to claim 1 , wherein the evaluation unit is configured to evaluate the state of the rolling mill based on a comparison between the polygonal index and a threshold value. 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 monitoring and control device for a rolling mill according to claim 1 or 2, wherein the evaluation unit is configured to evaluate the state of the rolling mill based on the polygonal index and the vibration level index. 4. The monitoring and control device for a rolling mill according to claim 3, wherein the evaluation unit is configured to evaluate the state of the rolling mill based on the polygonization 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. 5. The monitoring and control device for a rolling mill according to claim 3, wherein the vibration level indicator includes an indicator indicating the magnitude of acceleration of the roll. 5. The monitoring and control device for a rolling mill according to claim 3, wherein the vibration level indicator includes an indicator indicating the magnitude of displacement of the roll. 7. The monitoring and control device for a rolling mill according to claim 3, further comprising 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 1 to 7, further comprising an operating condition determining unit configured to determine operating conditions for the rolling mill so that the polygonal index does not exceed a threshold value. 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;
The monitoring and control device for a rolling mill according to any one of claims 1 to 8, comprising: 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: 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 vibrations 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: 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.