Roller wear state evaluation method, roller operation method, roller wear state evaluation device,

Abstract

A roller wear state evaluation method includes: a vibration data acquisition step of changing a rotation speed of a roller that rotates while being in contact with a metal plate or another roller, and acquiring vibration data indicating vibration of the roller over a plurality of rotations of the roller; an index acquisition step of acquiring, for each of a plurality of polygon numbers N of the roller, an index of a vibration amplitude at a frequency corresponding to the polygon number N using each number of rotations of the roller, on the basis of the vibration data; and an evaluation step for evaluating the state of wear of the roller on the basis of the plurality of indexes acquired corresponding to each of the plurality of polygon numbers N.

Description

Technical Field

[0001] This disclosure relates to a method for evaluating the wear condition of rollers, an operating method, a device for evaluating the wear condition of rollers, an operating device, and rolling equipment. Background Technology

[0002] When processing metal sheets using machinery including rollers, such as rolling mills and straighteners, the rollers rotate while in contact with the metal sheet, causing wear and sometimes resulting in the roller's cross-sectional shape approaching a specific N-sided polygon (N-gonalization). If this polygonalization continues, unevenness corresponding to the roller's polygonal shape forms on the surface of the metal sheet in contact with the roller. This can sometimes cause problems with product quality, or increase the frequency of roller replacements and reduce productivity. Therefore, it is desirable to appropriately control the growth tendency of roller polygonization to avoid it.

[0003] Patent Document 1 describes a method for calculating a characteristic value of an index representing the time-dependent change in the vibration amplitude of a rolling roll during rolling with a constant rotation speed, and then evaluating the tendency of the rolling roll to become N-sided based on this characteristic value.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 7179997 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] However, in order to quickly detect and respond to the polygonal growth of the roll, it is desirable to grasp the wear condition of the roll earlier.

[0009] In view of the above, the object of at least one embodiment of the present invention is to provide a method for evaluating the wear condition of a roll, an operating method, a device for evaluating the wear condition of a roll, an operating device, and a rolling equipment that can know the wear condition of a roll in advance.

[0010] Methods for solving problems

[0011] The roller wear condition evaluation method of at least one embodiment of the present invention includes:

[0012] The vibration data acquisition step involves changing the rotational speed of a roller that rotates while in contact with a metal plate or other rollers, and acquiring vibration data representing the vibration of the roller over multiple rotations of the roller.

[0013] The index acquisition step involves, based on the vibration data, acquiring an index of the vibration amplitude at a frequency corresponding to the number of sides N for each of the plurality of polygon numbers N of the roller, using each number of rotations of the roller; and

[0014] The evaluation step assesses the wear condition of the roller based on a plurality of indicators obtained corresponding to each of the plurality of polygon numbers N.

[0015] Furthermore, at least one embodiment of the present invention is an operating method of a machine including rollers and used for processing a metal sheet using said rollers, wherein...

[0016] The operation method includes:

[0017] The steps of obtaining the evaluation result of the wear state of the roller using the above-described wear state evaluation method; and

[0018] The step of changing the rotational speed of the roller based on the evaluation results.

[0019] Furthermore, the roller wear condition evaluation device according to at least one embodiment of the present invention includes:

[0020] The vibration data acquisition unit is configured to change the rotational speed of a roller that rotates while in contact with a metal plate or other rollers, and acquire vibration data representing the vibration of the roller after multiple rotations of the roller;

[0021] The index acquisition unit is configured to, based on the vibration data, acquire an index of the vibration amplitude at a frequency corresponding to the number of sides N for each of the plurality of polygon numbers N of the roller, using each number of rotations of the roller; and

[0022] The evaluation unit is configured to evaluate the wear condition of the roller based on a plurality of indicators obtained corresponding to each of the plurality of polygon numbers N.

[0023] Furthermore, at least one embodiment of the operating device of the present invention is an operating device that includes rollers and is used for processing metal sheets using said rollers, wherein,

[0024] The operating device includes:

[0025] The aforementioned wear condition evaluation device is configured to obtain an evaluation result of the wear condition of the roller; and

[0026] The control unit is configured to change the rotational speed of the roller based on the evaluation results.

[0027] Furthermore, the rolling apparatus of at least one embodiment of the present invention includes:

[0028] A rolling apparatus, comprising rolls for rolling a sheet of metal; and

[0029] The wear condition evaluation device described above is configured to evaluate the wear condition of the roller.

[0030] Invention Effects

[0031] According to at least one embodiment of the present invention, a roller wear condition evaluation method, an operation method, a roller wear condition evaluation device, an operation device, and a rolling equipment are provided, which are capable of knowing the wear condition of rollers in advance. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a rolling mill according to one embodiment.

[0033] Figure 2 This is a schematic structural diagram of a wear condition evaluation device / operation device according to one embodiment.

[0034] Figure 3 This is a summary flowchart of a method for evaluating the wear condition of a roller according to one embodiment.

[0035] Figure 4 This is a graph showing the frequency analysis results of the vibration data of the rolling roll and an example of the change in the roll rotation speed.

[0036] Figure 5 This is a chart illustrating an example of the analysis results showing the time history of the vibration level for each polygon number N.

[0037] Figure 6 It is a graph showing the index of vibration amplitude obtained for multiple polygon numbers N.

[0038] Figure 7 It is a graph showing the index of vibration amplitude obtained for multiple polygon numbers N.

[0039] Figure 8 This is a graph illustrating an example of the relationship between the number of polygons N and the rotational speed of a roller where the vibration amplitude reaches its maximum.

[0040] Figure 9 This is a graph illustrating an example of the time variation of roller rotation speed in a wear condition evaluation method according to one embodiment.

[0041] Figure 10 This is an example of a graph showing the time variation of an index of vibration amplitude obtained through a wear condition evaluation method according to one embodiment.

[0042] Figure 11 This is an example of a graph showing the time variation of an index of vibration amplitude obtained through a wear condition evaluation method according to one embodiment.

[0043] Figure 12 This is a summary flowchart of a method for evaluating the wear condition of a roller according to one embodiment.

[0044] Figure 13 This is a schematic diagram of a rolling mill where the rolling rolls produce an N-sided shape. Detailed Implementation

[0045] Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings. The dimensions, materials, shapes, and relative arrangements of the constituent components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples.

[0046] In several embodiments of wear condition evaluation methods or apparatuses, the wear condition of a roller rotating while in contact with a metal sheet or other rollers is evaluated. Hereinafter, as several embodiments of the present invention, apparatuses and methods for evaluating the wear condition of rollers used for rolling metal sheets (work rollers in contact with the metal sheet, or support rollers in contact with work rollers (other rollers)) will be described, but the present invention is not limited thereto. For example, in several embodiments, the wear condition of rollers (work rollers in contact with the metal sheet or support rollers in contact with work rollers (other rollers)) constituting a straightening machine (hot straightening machine, tension straightening machine, etc.) used for straightening the shape of a metal sheet may also be evaluated.

[0047] (Structure of rolling mill equipment)

[0048] Figure 1 This is a schematic diagram of a rolling mill employing several implementation methods for its operating device / wear condition evaluation device and operating method / wear condition evaluation method. For example... Figure 1 As shown, one embodiment of the rolling mill 1 includes: a rolling apparatus 2, which includes a rolling mill stand 10 configured to roll a metal sheet S; and a wear condition evaluation device 51 configured to evaluate the wear condition of the rolling rolls 3 (rolls) of the rolling apparatus 2. Additionally, the rolling mill 1 includes a vibration measuring unit 90 for measuring the vibration of the rolling rolls 3 constituting the rolling mill stand 10. In one embodiment, the wear condition evaluation device 51 may also function as part of an operating device 50 for operating the rolling apparatus 2 (including the machinery of the rolling rolls 3).

[0049] The rolling mill stand 10 includes: a plurality of rolling rolls 3 for rolling a metal sheet S; a pressing device 8 for applying a load to the rolling rolls 3 to press down the metal sheet S; and a housing (not shown), etc. The pressing device 8 may also include a hydraulic cylinder.

[0050] exist Figure 1In the rolling apparatus 2 shown, the rolling rolls 3 include: a pair of work rolls 4A and 4B, which are arranged to sandwich a metal plate S; and a pair of support rolls 6A and 6B, which sandwich the pair of work rolls 4A and 4B and are arranged on the opposite side from the metal plate S, respectively, for supporting the pair of work rolls 4A and 4B. The work rolls 4A and 4B are supported by roll bearing housings (bearings) 5A and 5B respectively, enabling them to rotate. The support rolls 6A and 6B are supported by roll bearing housings 7A and 7B respectively, enabling them to rotate. The roll bearing housings 5A and 5B and the roll bearing housings 7A and 7B are supported by a housing (not shown).

[0051] exist Figure 1 In the rolling mill 1 shown, the vibration measurement unit 90 includes acceleration sensors 91 to 94 respectively mounted on roll bearing housings 5A, 5B, 7A, and 7B. Acceleration sensors 91 to 94 are configured to detect vibrations in any direction (e.g., vertical, horizontal, and / or the rotation axis direction of the rolling roll 3) of the roll bearing housings 5A, 5B, 7A, and 7B, that is, to detect vibrations in any direction of the work rolls 4A and 4B and the support rolls 6A and 6B. The signals representing the aforementioned vibrations detected by the acceleration sensors 91 to 94 are sent to the wear condition evaluation device 51.

[0052] In other embodiments, the vibration measuring unit 90 may also 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 can be calculated based on the measurement results obtained by the displacement detection unit. For example, a laser-type or eddy current-type displacement meter can be used as the displacement detection unit. Alternatively, an imaging device (camera, etc.) can be used as the displacement detection unit. In this case, an imaging device can be used to photograph a portion of the rolling roll 3, and the obtained image data can be processed to calculate the vibration of the rolling roll 3.

[0053] Figure 2 This is a schematic structural diagram of a wear condition evaluation device 51 and an operating device 50 according to one embodiment. The wear condition evaluation device 51, as detailed below, is configured to evaluate the wear condition of the rolling roll 3. The operating device 50 includes the wear condition evaluation device 51 and is configured to control the operation of the rolling mill 2, which includes the rolling roll 3.

[0054] The wear condition evaluation device 51 is configured to receive signals indicating the vibration of the rolling roll 3 from the vibration measuring unit 90, and to receive signals indicating the number of revolutions of the rolling roll 3 (work rolls 4A, 4B, etc.) measured by the rotation speed measuring unit 96. Furthermore, the wear condition evaluation device 51 is configured to process the received signals.

[0055] like Figure 2As shown, the wear condition evaluation device 51 (operation device 50) includes a vibration data acquisition unit 52, an index acquisition unit 54, and an evaluation unit 60. Additionally, the operation device 50 includes a control unit 64 and / or an output unit 66.

[0056] The vibration data acquisition unit 52 is configured to change the rotational speed of the rolling roll 3 (the roll being evaluated; any one of the work rolls 4A, 4B and support rolls 6A, 6B) which rotates while in contact with the metal plate S or other rolls, and acquire vibration data representing the vibration of the rolling roll 3 after multiple rotations of the rolling roll 3.

[0057] The index acquisition unit 54 is configured to acquire an index of the vibration amplitude at a frequency corresponding to the number of sides N for each of the plurality of sides N of the rolling roll 3, based on the vibration data acquired by the vibration data acquisition unit 52.

[0058] The evaluation unit 60 is configured to evaluate the wear condition of the rolling roll 3 based on multiple indicators (multiple indicators corresponding to each of the multiple polygon numbers N) obtained by the indicator acquisition unit 54.

[0059] The control unit 64 is configured to control the rolling apparatus 2 based on the evaluation results of the evaluation unit 60 on the wear condition of the rolling roll 3, so as to change the operating conditions (such as the rotational speed of the rolling roll 3). The control unit 64 may also be configured to adjust the current value of the motor 70 that drives the rolling roll 3 to control the rotational speed of the rolling roll 3.

[0060] The output unit 66 is configured to output the calculation results and evaluation results based on the wear condition evaluation device 51. The calculation results and evaluation results based on the wear condition evaluation device 51 can also be output to the display unit 68 (such as a display) via the output unit 66.

[0061] The wear condition evaluation device 51 (operation device 50) includes a computer equipped with a processor (CPU or GPU, etc.), a storage device (storage device; RAM, etc.), an auxiliary storage unit, and an interface. The wear condition evaluation device 51 (operation device 50) receives signals from various measuring devices (such as the vibration measuring unit 90 or the rotation speed measuring unit 96 mentioned above) via the interface. The processor is configured to process these received signals. Thus, the functions of the aforementioned functional units (vibration data acquisition unit 52, index acquisition unit 54, evaluation unit 60, control unit 64, and / or output unit 66) are realized.

[0062] The processing content in the wear condition evaluation device 51 (operation device 50) is installed as a program executed by the processor. The program can also be stored in an auxiliary storage unit. During program execution, these programs are expanded in the storage unit. The processor reads the program from the storage unit and executes the commands contained in the program.

[0063] If the rolling apparatus 2 described above is used to continuously roll the metal sheet S, sometimes the cross-sectional shape of the rolling roll 3 will become approximately N-sided, close to a specific N-sided shape. Here, Figure 13 This is a schematic diagram of a rolling device in which the rolling roll 3 produces an N-sided shape. Figure 13 The rolling mill 2 shown includes multiple rolling stands 10A to 10C. The cross-sectional shape of the rolling rolls 3, orthogonal to the axial direction, is generally circular, like the rolling rolls 3 of rolling stands 10A or 10C, but... Figure 13 The cross-sectional shape of the rolling rolls 3 (work rolls 4A, 4B and support rolls 6A, 6B) of the rolling mill stand 10B shown is N-sided (specifically 12-sided), resulting in N-sided shaping of these rolling rolls 3.

[0064] If the rolling roll 3 develops an N-sided shape and grows, unevenness corresponding to the N-sided shape of the rolling roll 3 will form on the surface of the metal sheet S rolled by the rolling roll 3, which can sometimes cause problems with product quality. Therefore, it is desirable to properly control the N-sided shape of the rolling roll 3 to suppress the degradation of the product metal sheet quality.

[0065] It should be noted that, in Figure 13 The diagram schematically illustrates the situation where 12-sided polygons (N=12) are generated in each rolling roll 3. However, in actual rolling equipment, although it also depends on the operating conditions such as the speed of the rolling roll 3, sometimes N-sided polygons with N of about 50 or 100 are generated in the rolling roll 3.

[0066] Furthermore, depending on the operating conditions and specifications (natural vibration frequency, etc.) of the rolling mill 2, N-gonalization may sometimes occur in the rolling rolls 3 of a specific rolling stand 10, or in specific rolling rolls 3 (work rolls 4A, 4B or support rolls 6A, 6B) among the multiple rolling rolls 3 constituting a rolling stand. For example, in the case of hot rolling at a higher temperature, N-gonalization is more likely to occur in the work rolls 4A, 4B. Conversely, in the case of cold rolling at a lower temperature, N-gonalization is more likely to occur in the support rolls 6A, 6B.

[0067] (Wear condition evaluation method and operation method)

[0068] Next, the wear condition evaluation methods for rolls in several embodiments will be described. In the wear condition evaluation methods described below, the polygonal state of the rolling rolls 3 (at least one of the work rolls 4A, 4B and the support rolls 6A, 6B) is evaluated. It should be noted that the following describes the method of evaluating the state of the rolling mill 2 using the wear condition evaluation device 51 described above, but in several embodiments, other devices may be used or some or all of the processes performed by the wear condition evaluation device 51 described below may be performed manually.

[0069] Figure 3 This is a summary flowchart of a method for evaluating the wear condition of a roller according to one embodiment.

[0070] In one embodiment, firstly, the rotational speed of the rolling roll 3 (the work roll 4A, 4B or support roll 6A, 6B of the evaluation object) rotating while in contact with the metal plate S or other rolls is varied, and the vibration of the rolling roll 3 is measured by the vibration measuring unit 90 after multiple rotations of the rolling roll 3. The vibration data acquisition unit 52 acquires vibration data (S2) representing the vibration of the rolling roll 3 measured by the vibration measuring unit 90.

[0071] In step S2, vibration data can be obtained while the rotational speed of the rolling roll 3 is continuously varied (increased or decreased), or vibration data can be obtained while the rotational speed of the rolling roll 3 is varied in a stepwise manner. It should be noted that in step S2, vibration data can also be obtained (measured) while the metal plate S is being rolled by the rolling roll 3 (i.e., the rolling roll 3 is rotated while the metal plate S is being pressed down).

[0072] Next, based on the vibration data obtained in step S2, the index acquisition unit 54 acquires an index of the vibration amplitude at a frequency corresponding to the number of sides N for each of the plurality of sides N of the rolling roll 3 after each number of rotations of the rolling roll 3 (S4).

[0073] Then, the evaluation unit 60 evaluates the wear condition of the rolling roll 3 based on the indicators obtained in step S4 (S6).

[0074] In step S4, firstly, frequency analysis is performed on the vibration data obtained in step S2. For each of the multiple polygon numbers N of the rolling roll 3, the vibration amplitude A at the frequency corresponding to the polygon number N for each rotation number i of the rolling roll 3 is obtained. N，i It should be noted that A N，iThis refers to the vibration amplitude at the frequency corresponding to the number of sides N during the i-th rotation of the rolling roll 3. It should be noted that the frequency corresponding to the number of sides N of the rolling roll 3 is the vibration frequency caused by the shape (N-sided) of the rolling roll 3, which is equivalent to the product of the number of revolutions (rotation speed) f of the rolling roll 3 and N (f×N).

[0075] The vibration amplitude A mentioned above N，i For example, it can be obtained as follows: that is, time-frequency analysis is performed on the vibration data obtained in step S2. Time-frequency analysis can be performed using techniques such as Fast Fourier Transform (FFT) or Wavelet Transform.

[0076] Figure 4 This is a graph showing the time-frequency analysis results of vibration data of rolling roll 3 obtained during the rolling of a certain metal plate S, and an example of the change in roll rotation speed when the vibration data was obtained. Figure 4 The horizontal axis of the chart represents time, and the vertical axis represents vibration frequency and roller rotation speed. The color intensity indicates the magnitude of the vibration; darker colors indicate stronger vibrations. It should be noted that... Figure 4 The results show the vibration data obtained during the rolling of the metal plate S by increasing the rotational speed of the rolling roll 3 over time, dividing the vibration data into vibration data for each predetermined period (e.g., every 1 second), and performing frequency analysis on each.

[0077] Based on the frequency analysis results above, a cycle ratio analysis is performed according to the relationship between the number of polygons N, rotational speed (rotational speed f), and vibration frequency. This analysis examines the time history of the vibration level for each polygon number N (also known as the cycle number). Figure 5 This is a graph illustrating an example of the analysis results showing the time history of the vibration level for each polygon number N (number of rotations). Since the number of rotations i of the roller corresponds one-to-one with time, according to this analysis, the vibration amplitude A can be obtained for each rotation number i for each polygon number N. N，i .

[0078] Alternatively, the vibration amplitude A mentioned above N，i For example, it can be obtained as follows: The vibration data obtained in step S2 is divided into segments according to each rotation number i, and frequency analysis is performed on each segmented vibration data. Thus, for each rotation number i, the vibration amplitude A at the frequency corresponding to each polygon number N can be obtained. N，i .

[0079] Next, in step S4, the vibration amplitude A obtained in this way is used. N，i To obtain indicators for evaluating the wear condition of the rolling roll 3. Here, Figure 6 and Figure 7The figures for the vibration amplitude A for the rolling roll 3 are shown below, based on the vibration amplitudes N (N = 32 to 63) for multiple polygon numbers. N，i The indicator (ΣA) N，i , Σσ N，i ＋ , Σσ N，i - and Σσ N，i (See the charts below.)

[0080] In step S4, as the aforementioned indicator, the vibration amplitude A of the rolling roll 3 at the frequency corresponding to the number of polygons N for each rotation number i from the start of rotation (i=1) to the end of rotation can also be obtained. N，i The sum of (i = 1, 2, 3, ...) is the cumulative vibration amplitude ΣA N，i .

[0081] In this case, in step S6, the multiple cumulative vibration amplitudes ΣA, which correspond to the multiple polygon numbers N respectively, can also be used. N，i Determine the specific number of polygons N for polygonal growth or decay in the rolling roll 3.

[0082] For example, in step S6, the cumulative vibration amplitude ΣA associated with a specific polygon number N. N，i The cumulative vibration amplitude ΣA over all polygon numbers N N，i When the difference between the average values ​​is greater than a specified value, it can be determined that the polygonization (N-sided polygonization) is growing or decaying under that specific number of sides N. For example, in Figure 7 In the case shown, for N = 35 to 40 (35-sided polygon to 40-sided polygon); Figure 7 The cumulative vibration amplitude ΣA in region A) N，i Significantly greater than the cumulative vibration amplitude ΣA for other N N，i Large. Therefore, for N = 35–40, it can be determined that the rolling roll 3 is a polygonal growth. It should be noted that the cumulative vibration amplitude ΣA for a specific number of polygons N is... N，i Significantly greater than the cumulative vibration amplitude ΣA for other N N，i For hours, it is possible to determine the polygonization attenuation of the rolling roll 3 for that specific number of sides N.

[0083] Alternatively, in step S6, the cumulative vibration amplitude ΣA for multiple polygon numbers N can also be calculated. N，i When the deviation is large, it is determined to be polygonization (N-sided polygonization) growth under any number of sides N. For example, in the cumulative vibration amplitude ΣA for multiple numbers of sides N. N，i When the coefficient of variation (the value obtained by dividing the standard deviation by the average) is greater than the threshold, it can be determined as polygonal growth or attenuation of the rolling roll 3 for a specific number of sides N.

[0084] Alternatively, in step S4, the vibration amplitude growth ratio σ can also be used as the aforementioned indicator. N，i The index. Here, the vibration amplitude growth ratio σ N，i It refers to the vibration amplitude (A) at the frequency corresponding to the polygon number N for each of multiple polygon numbers N, based on the second rotation number (e.g., the (i+1)th rotation) after the first rotation number (e.g., the i-th rotation). N，（i＋1） The vibration amplitude (A) at the frequency corresponding to the polygon number N at the first number of rotations. N，i The ratio of A to A can also be obtained as the logarithm of that ratio (ln(A)). N，（i＋1） / A N，i )).

[0085] In this case, in step S6, multiple vibration amplitude growth ratios σ, obtained respectively corresponding to multiple polygon numbers N, can also be used. N，i The indicators are used to evaluate the tendency of polygonization growth or decay in the rolling roll 3.

[0086] For each of the multiple polygon numbers N, the vibration amplitude growth ratio σ was used. N，i The index can also be the positive cumulative growth ratio Σσ for each polygon number N. N，i ＋ Negative cumulative growth ratio Σσ N，i - Or net cumulative growth ratio Σσ N，i (Reference Figure 6 and Figure 7 ).

[0087] For a given number of polygons N, the positive cumulative growth ratio Σσ N，i ＋ It refers to the growth ratio σ of multiple vibration amplitudes for the polygon number N. N，i The sum of positive values ​​in (i = 1, 2, 3, ...).

[0088] For a given polygon number N, the negative cumulative growth ratio Σσ N，i - It refers to the growth ratio σ of multiple vibration amplitudes for the polygon number N. N，i The sum of negative values ​​in (i = 1, 2, 3, ...).

[0089] The net cumulative growth ratio Σσ for a given number of polygons N N，i It is the positive cumulative growth ratio Σσ for the polygon number N. N，i ＋ With negative cumulative growth ratio Σσ N，i - sum.

[0090] In step S6, for example, it can also be based on multiple positive cumulative growth ratios Σσ, which correspond to the multiple polygon numbers N respectively. N，i ＋ and multiple negative cumulative growth ratios Σσ N，i - The tendency of polygonization growth or decay in the rolling roll 3 is evaluated by comparing the deviation value of at least one of them with a threshold.

[0091] Multiple positive cumulative growth ratios Σσ are obtained, corresponding to multiple polygon numbers N respectively. N，i ＋ Or multiple negative cumulative growth ratios Σσ N，i - When the deviation is small (e.g.) Figure 6 As shown in the figure, it can be evaluated as a state of dispersed growth of polygonization (i.e., average) for multiple polygon numbers N in the rolling roll 3, and there is no indication of rapid polygonization growth for a specific polygon number N.

[0092] Σσ represents the cumulative growth ratio of multiple positive values. N，i ＋ Or multiple negative cumulative growth ratios Σσ N，i - The deviation values ​​can be obtained using these variation factors (the values ​​obtained by dividing the standard deviation by the mean).

[0093] Alternatively, in step S6, the positive cumulative growth ratio Σσ for a specific number of polygons N can also be used as a basis. N，i ＋ Or negative cumulative growth ratio Σσ N，i - Is the absolute value greater than the cumulative growth ratio Σσ for multiple positive polygon numbers N? N，i ＋ Or multiple negative cumulative growth ratios Σσ N，i - The average absolute value is small, and the average absolute value of this value has a positive cumulative growth ratio Σσ for a specific number of sides N. N，i ＋ Or negative cumulative growth ratio Σσ N，i - Whether the absolute difference is above a threshold is used to evaluate the tendency of polygonization growth or decay in the rolling roll 3.

[0094] For a specific number of sides N, the positive cumulative growth ratio Σσ N，i ＋ Or negative cumulative growth ratio Σσ N，i - The absolute value (e.g., reference) Figure 7The positive cumulative growth ratio Σσ for N=37 N，i ＋ ) than multiple positive cumulative growth ratios Σσ N，i ＋ Or negative cumulative growth ratio Σσ N，i - The absolute value of the average AVG (refer to) Figure 7 Small, and its difference D (refer to) Figure 7 In the case of a large cumulative growth ratio, the polygonization of that specific number of polygons N can be evaluated as a state of saturated growth that neither grows nor decays. That is, when there is a number of polygons N with a positive cumulative growth ratio or a negative cumulative growth ratio whose absolute value is locally small, the polygonization of that number of polygons N can be evaluated as a state of saturated growth that neither grows nor decays.

[0095] For example, in Figure 7 In the case shown, when N = 35 to 40 ( Figure 7 Region B in the middle), positive cumulative growth ratio Σσ N，i ＋ The absolute value is significantly greater than the cumulative growth ratio Σσ of multiple positive values. N，i ＋ The average absolute value of AVG is small (i.e., locally small). Therefore, it can be evaluated as a state of saturated growth for polygonization of N = 35–40, which neither grows nor decays.

[0096] Alternatively, multiple positive cumulative growth ratios Σσ can be obtained, each corresponding to a different number of polygons N. N，i ＋ Or multiple negative cumulative growth ratios Σσ N，i - When the deviation is large (for example, when the above-mentioned variation coefficient is large), the rolling roll 3 is evaluated as being in a state of saturated growth.

[0097] It should be noted that, regarding Figure 7 As shown, based on the positive or negative cumulative growth ratio (Σσ) N，i ＋ or Σσ N，i - This can be evaluated as a saturated growth state where polygonization for N = 35–40 neither grows nor decays, and based on the vibration amplitude growth ratio (σ) N，i This can be evaluated as polygonal growth for N = 35–40. That is, in Figure 7 In the case shown, the polygonization of N=35 to 40 has grown to a large extent. If the rolling device 2 continues to operate under the same conditions, it is expected to maintain the current state in which the polygonization of N=35 to 40 has grown to a large extent.

[0098] Thus, by using the vibration amplitude growth ratio (σ) together... N，i The evaluation of ) and the use of positive or negative cumulative growth ratios (Σσ) N，i ＋ or Σσ N，i - The evaluation of roller wear can provide a more detailed assessment of the roller's wear condition.

[0099] In several implementations, step S6 may also be based on multiple positive cumulative growth ratios Σσ, each corresponding to a plurality of polygon numbers N. N，i ＋ Or multiple negative cumulative growth ratios Σσ N，i - Use at least one of the following to evaluate the wear of the rolling roll 3.

[0100] The positive and negative cumulative growth ratios for a specific number of sides N are related to the wear amount caused by the polygonization of the rolling roll 3 corresponding to each number of sides N. Therefore, for each of the multiple numbers of sides N, it is possible to determine the wear amount based on the positive cumulative growth ratio Σσ. N，i ＋ Or negative cumulative growth ratio Σσ N，i - To evaluate the wear of rolling roll 3.

[0101] As an indicator of the wear amount of rolling roll 3, the absolute value of the positive cumulative growth ratio (|Σσ) for multiple polygon numbers N can be used. N，i ＋ The sum or average of | Σσ, the absolute value of the negative cumulative growth ratio for multiple polygon numbers N (|Σσ). N，i - The sum or average of (|).

[0102] It should be noted that, in cases where the rolling roll 3 has a high probability of maintaining a constant roll rotation speed and saturated growth for a specific number of sides N (refer to...), Figure 7 In the calculation of the above indicators representing wear, the region with a saturated polygon number N (the saturated region; in) is considered. Figure 7 The cumulative growth ratio (N=35-40) can also be excluded.

[0103] In several implementations, in step S6, for each of the plurality of polygon numbers N, the vibration amplitude A in the plurality of rotation numbers (i = 1, 2, 3, ...) is obtained. N，iThe first rotational speed of the roll corresponding to the largest number of rotations is determined, and based on the correlation between the number of sides N of the rolling roll 3 and the aforementioned first rotational speed, the inherent vibration frequency (hereinafter referred to as the inherent vibration frequency) of the rolling apparatus 2 (including the rolling roll 3, the rolling machine including the rolling roll 3) that is prone to polygonization is obtained. There are multiple inherent vibration frequencies of the rolling apparatus 2 (including the rolling machine including the rolling roll 3), but distinguishing the inherent vibration frequencies that are prone to polygonization of the roll will become effective information to prevent polygonization.

[0104] Depend on Figure 5 The chart shows that the vibration amplitude A of the rollers relative to the number of polygons N is... N，i It varies according to the number of rotations i of the roll (i.e., according to time) and has a maximum value. Furthermore, for multiple polygon numbers N, the vibration amplitude A of the rolling roll 3 relative to each polygon number N is... N，i The vibration amplitude A N，i When the rotational speed (number of revolutions) of the rolling roll 3 corresponding to the rotational number i that becomes the maximum value, i.e., the product of the first rotational speed f1 and the number of sides N (N×f1), is approximately constant, this product (N×f1) is approximately consistent with the natural vibration frequency fa of the rolling device 2 including the rolling roll 3. That is, the relationship between the number of sides N and the first rotational speed f1 is shown in the graph as follows: Figure 8 In the case of a hyperbolic shape as shown, the natural vibration frequency (fa≈N×f1) of the rolling mill 2, including the rolling roll 3, can be determined. It should be noted that... Figure 8 This shows the number of polygons N and the vibration amplitude A. N，i A graph illustrating an example of the correlation between the rotational speed of a roller that reaches a maximum value.

[0105] Thus, based on the number of sides N of the rolling roll 3 and the vibration amplitude A of the rolling roll 3 in multiple rotation numbers (i = 1, 2, 3, ...), N，i By determining the relationship between the first rotational speed f1 of the roller corresponding to the maximum number of rotations i, the inherent vibration frequency of the rolling device 2, including the rolling roll 3, can be obtained.

[0106] Figure 9 This is a graph illustrating an example of the time variation of roller rotation speed in a wear condition evaluation method according to one embodiment. Figure 10 and Figure 11 This illustrates the vibration amplitude A obtained based on a wear condition evaluation method according to one embodiment. N，i An example of a chart showing the time-varying changes of an indicator. Figure 10 and Figure 11 The charts shown for #001 to #009 are respectively... Figure 6 , Figure 7 The charts shown are the same.

[0107] In several embodiments, in step S2, multiple portions of one or more metal plates S (e.g., in...) are... Figures 9-11 In the example shown, the nine parts (#001 to #009) are the processing objects in the rolling roll 3, and the above-mentioned vibration data are obtained for each of the multiple parts. That is, for multiple parts (#001 to #009) of more than one metal plate S, vibration data are obtained while rolling by changing the rotation speed of the rolling roll 3 in sequence.

[0108] Each of the multiple portions of the aforementioned one or more metal plates S can be a coil made of a single metal plate. Alternatively, the multiple portions of the aforementioned one or more metal plates S can also be multiple portions of a continuous metal plate S (a coil or a portion formed by connecting multiple coils by welding or the like).

[0109] like Figure 9 As shown, the rotational speed of the rolling roll 3 can also increase from the lowest speed to the highest speed for each part (#001 to #009) of the metal plate S. In addition, the rotational speed (including the lowest speed and the highest speed) of the rolling roll 3 can also be different for each part (#001 to #009) of the metal plate S.

[0110] In step S4, for each of the plurality of portions of one or more metal plates S, the aforementioned index corresponding to each of the plurality of polygon numbers N is obtained. This index may be the aforementioned cumulative vibration amplitude ΣA. N，i Positive cumulative growth ratio Σσ N，i ＋ Negative cumulative growth ratio Σσ N，i - and / or net cumulative growth ratio Σσ N，i For example, according to such Figure 9 Vibration data obtained by varying the rotational speed of the rolling roll 3 for portions S (#001 to #009) of the metal plate, for each of the plurality of polygon numbers N, yields... Figures 10-11 The index shown (cumulative vibration amplitude ΣA) N，i Positive cumulative growth ratio Σσ N，i ＋ Negative cumulative growth ratio Σσ N，i - and net cumulative growth ratio Σσ N，i ).

[0111] In step S6, the wear condition of the rolling roll 3 is evaluated based on a comparison of the aforementioned indices obtained for each of multiple portions of one or more metal plates S. For example, it is possible to evaluate the wear condition of the rolling roll 3 based on the comparison of the indices obtained for each of the multiple portions of one or more metal plates S. Figures 10-11 The indicators obtained from the various portions (#001 to #009) of the metal plate S shown are evaluated as follows.

[0112] First, for each part (#001 to #009) of the metal plate S, according to the positive cumulative growth ratio Σσ N，i ＋ Or negative cumulative growth ratio Σσ N，i - This determines whether the growth in the rolling roll 3 is a polygonal, dispersed growth state or a saturated growth state. Figures 10-11 In the examples shown, in sections #001 to #008, the positive cumulative growth ratio Σσ occurs when N = 35 to 40. N，i ＋ and negative cumulative growth ratio Σσ N，i - The local area is relatively small (refer to the area). Figures 10-11 The part surrounded by the dotted line can be identified as a state of saturated growth.

[0113] Next, for the number of sides N that has reached a state of saturated growth (N = 35-40 in this example), it is determined whether polygonization should continue. Figures 10-11 In the example shown, for the parts #001 to #008, the cumulative vibration amplitude ΣA for polygon number N = 35 to 40 N，i The polygonal number increases approximately over time (i.e., from part #001 toward part #008). Therefore, with respect to the polygonal number N = 35 to 40, it can be determined that the polygonization of the rolling roll 3 is more significant.

[0114] Furthermore, the cumulative vibration amplitude ΣA obtained for each part of the metal plate S is... N，i By comparing with a threshold or variance, the timing for changing the speed of rolling roll 3 can be determined. Figures 10-11 In the example shown, the cumulative vibration amplitude ΣA for each of the plurality of polygon numbers N, from part #001 to part #007. N，i Less than the threshold (represented by a dashed straight line), but in part #008, for the cumulative vibration amplitude ΣA of N=38. N，i The threshold is exceeded. Therefore, by changing the speed of the rolling roll 3 at this point in time, it is possible to suppress the significant growth of polygonization for the number of sides N.

[0115] For example, in Figure 9 In the example shown, during the rolling of portion #009 of the metal plate S (i.e., when vibration data is obtained), compared to the rolling of portions 001 to #008, the rotational speed of the rolling roll 3 is significantly reduced, thereby... Figures 10-11 As shown, the wear condition of the rolling roll 3 tends to change. According to... Figures 10-11 During the rolling of metal plate S, part #009, the cumulative vibration amplitude ΣA was generated for the previously large polygon number N = 35-40.N，i Significantly reduced polygonization decay for N=35–40, and a positive cumulative growth ratio Σσ N，i ＋ and negative cumulative growth ratio Σσ N，i - The deviation becomes smaller, so the polygonization of the rolling roll 3 can be controlled to become a dispersed growth state.

[0116] In this way, vibration data is obtained for each of the multiple parts (#001 to #009) of one or more metal plates S, and the vibration amplitude A at the frequencies corresponding to the multiple polygon numbers N using the rolling roll 3 is obtained based on the vibration data. N，i The system has multiple indicators, thus enabling the monitoring of the changes in these indicators over time, each corresponding to a different polygon number N. Therefore, it is possible to anticipate changes in the wear condition of the rolling rolls.

[0117] Figure 12 This is a summary flowchart of a method for evaluating the wear condition of a roller according to one embodiment. In several embodiments, the aforementioned index (cumulative vibration amplitude ΣA) is obtained by using calculations from a predictive model. N，i Positive cumulative growth ratio Σσ N，i ＋ Negative cumulative growth ratio Σσ N，i - and / or net cumulative growth ratio Σσ N，i The predicted values ​​of the indicators obtained in step S10 are then compared with the indicators obtained in steps S2 to S4 above (indicators obtained based on measured vibration data) (S12). Based on this comparison, the prediction model used in the calculation in step S10 is corrected (S14).

[0118] In step S10, based on a prediction model using the spring constant between the evaluation object's roll (rolling roll 3) and the metal plate S or other rolls it contacts, the position and shape of the evaluation object's roll at each moment are calculated, and the aforementioned index (cumulative vibration amplitude ΣA) is calculated accordingly. N，i Positive cumulative growth ratio Σσ N，i ＋ Negative cumulative growth ratio Σσ N，i - and / or net cumulative growth ratio Σσ N，i The predicted values ​​(etc.).

[0119] The prediction model used in step S10 may also include a motion equation for the roller expressed by the spring constant, damping constant, and friction constant between the metal plate S in contact with the roller of the evaluation object and / or other rollers.

[0120] In steps S12 to S14, the prediction model (e.g., the spring constant, wear constant, etc. mentioned above) is modified so that the index calculated based on the prediction model is close to the index obtained in steps S2 to S4 (the index obtained based on the measured vibration data).

[0121] According to the above-described implementation, the prediction model, which uses the spring constant between the rolling roll 3 and the metal plate S or other rolls, can be corrected by comparing the predicted values ​​of the aforementioned multiple indicators corresponding to each of the multiple polygon numbers N obtained through calculation using the prediction model with those obtained in the indicator acquisition step (indicators based on vibration measurement data). This improves the prediction accuracy of the aforementioned multiple indicators and enhances the accuracy of the evaluation of the roll wear condition based on the predicted multiple indicators.

[0122] In several embodiments of the operation method of a machine for processing metal sheets using rollers (e.g., a rolling apparatus 2 for rolling metal sheet S using rolling roll 3), the rotational speed of the rollers (rolling roll 3, etc.) is changed, for example, by a control unit 64, based on the evaluation results of the wear condition of the rollers in the sequence of steps S2 to S4 described above. The control unit 64 may also be configured to adjust the current value of the motor 70 that drives the rolling roll 3 to obtain the changed rotational speed of the rollers determined based on the evaluation results of the roller wear condition.

[0123] For example, through the process of steps S2 to S4 described above, when it is determined that the polygonization under a specific number of sides N is growing significantly, the growth of polygonization under that specific number of sides N can be suppressed by changing the rotation speed of the roller to a higher or lower speed than before.

[0124] According to the method of the above-described embodiment, the rotational speed of the roller is changed based on the result of evaluating the wear state of the roller by the method including the steps S2 to S4 described above, so the progress of polygonization growth generated on the roller can be appropriately suppressed.

[0125] The contents described in the above embodiments should be understood, for example, as follows.

[0126] [1] The roller wear condition evaluation method of at least one embodiment of the present invention includes:

[0127] The vibration data acquisition step (S2) involves changing the rotational speed of a roller (e.g., rolling roller 3) that rotates while in contact with a metal plate (S) or other rollers, and acquiring vibration data representing the vibration of the roller over multiple rotations of the roller.

[0128] In the index acquisition step (S4), based on the vibration data, for each of the plurality of polygon numbers N of the roller, the vibration amplitude (A) at the frequency corresponding to the polygon number N for each number of rotations (i) of the roller is obtained. N，i The indicators; and

[0129] The evaluation step (S6) evaluates the wear condition of the roller based on a plurality of indicators obtained corresponding to each of the plurality of polygon numbers N.

[0130] In the method described above [1], since the vibration data of the roller is obtained while the rotational speed of the roller is changed, multiple indicators of the vibration amplitude at frequencies corresponding to the multiple polygon numbers N of the roller can be obtained based on the vibration data obtained in a relatively short period of time. Furthermore, the wear state (polygonization, etc.) of the roller can be grasped based on these multiple indicators. Therefore, according to the method described above [1], the wear state of the roller can be grasped in advance.

[0131] [2] In several embodiments, based on the method described in [1] above,

[0132] In the index acquisition step, based on the vibration data, for each of the plurality of polygon numbers N, the sum of the vibration amplitudes at the frequency corresponding to the polygon number N for each rotation number of the roller is obtained, i.e., the cumulative vibration amplitude (ΣA). N，i ) as the aforementioned indicator,

[0133] In the evaluation step, based on the cumulative vibration amplitudes obtained corresponding to the plurality of polygon numbers N, a specific polygon number N for polygonal growth or decay in the roller is determined.

[0134] According to the method described above [2], since the cumulative vibration amplitude (the sum of the vibration amplitudes at each rotation of the roller at the frequencies corresponding to each number of polygons N) is obtained for each of the multiple polygon numbers N, the distribution of the cumulative vibration amplitude for the multiple polygon numbers N can be determined. Therefore, based on the distribution of the cumulative vibration amplitude for the multiple polygon numbers N, it is possible to determine under which number of polygons N the polygonization growth or decay of the roller occurs.

[0135] [3] In several embodiments, based on the method described in [1] above,

[0136] In the step of obtaining the index, based on the vibration data, for each of the plurality of polygon numbers N, the vibration amplitude growth ratio (σ) is obtained. N，i The index of vibration amplitude growth ratio (σ) N，iThe value is determined by the ratio of the vibration amplitude at the frequency corresponding to the polygon number N in the second rotation after the first rotation to the vibration amplitude at the frequency corresponding to the polygon number N in the first rotation.

[0137] In the evaluation step, the tendency of polygonization growth or decline in the roller is evaluated based on a plurality of indicators obtained corresponding to the plurality of polygon numbers N.

[0138] According to the method described above [3], since an index of vibration amplitude growth ratio (a value obtained by comparing the vibration amplitude at the frequency corresponding to the number of sides N in the second rotation with the vibration amplitude at the frequency corresponding to the number of sides N in the first rotation) is used for each of the multiple polygon numbers N, the distribution of the index of vibration amplitude growth ratio used for multiple polygon numbers N can be determined. Therefore, the tendency of polygonization growth or attenuation of the roller (growth pattern, etc.) can be evaluated based on the distribution of the index of vibration amplitude growth ratio used for multiple polygon numbers N.

[0139] [4] In several embodiments, based on the method described in [3] above,

[0140] For each of the plurality of polygon numbers N, the index used for the vibration amplitude growth ratio includes the sum of the positive growth ratios among the vibration amplitude growth ratios, i.e., the positive cumulative growth ratio (Σσ). N，i ＋ ) or the sum of the negative growth ratios in the vibration amplitude growth ratio, i.e., the negative cumulative growth ratio (Σσ). N，i - ),

[0141] In the evaluation step, the tendency of polygonization growth or decay in the roller is evaluated based on at least one of the plurality of positive cumulative growth ratios and the plurality of negative cumulative growth ratios obtained respectively corresponding to the plurality of polygon numbers N.

[0142] The positive and negative cumulative growth ratios for a specific number of polygons N represent the degree of polygonization growth and decline for that number of polygons N, respectively. According to the method described above [4], since a positive or negative cumulative growth ratio is obtained for each of the multiple numbers of polygons N, the distribution of the positive or negative cumulative growth ratios for each of the multiple numbers of polygons N can be grasped. Therefore, the tendency of the roll to polygonize (growth pattern, etc.) can be evaluated based on the distribution of the positive or negative cumulative growth ratios for the multiple numbers of polygons N.

[0143] [5] In several embodiments, based on the method described in [4] above,

[0144] In the evaluation step, the tendency for polygonization growth or decay in the roller is evaluated by comparing a value representing the deviation of at least one of the plurality of positive cumulative growth ratios and the plurality of negative cumulative growth ratios obtained corresponding to the plurality of polygon numbers N with a threshold.

[0145] According to the method described above [5], since a value representing the deviation of a positive or negative cumulative growth ratio is obtained for each of the multiple polygon numbers N, the tendency of the roll to polygonize or decline can be evaluated based on a comparison of this value with a threshold. For example, if the deviation of the positive or negative cumulative growth ratio is small, it can be evaluated as a state of polygonized dispersed growth for the multiple polygon numbers N.

[0146] [6] In several embodiments, based on the method described in [4] above,

[0147] In the evaluation step, the tendency for polygonization growth or decay in the roller is evaluated based on whether the absolute value of the index for a specific number of polygons N is smaller than the average of the absolute values ​​of the indexes for the plurality of numbers of polygons N, and whether the difference between the average of the absolute values ​​of the indexes for the plurality of numbers of polygons N and the absolute value of the index for the specific number of polygons N is above a threshold.

[0148] According to the method described above [6], for each of the multiple polygon numbers N, the absolute value of the positive or negative cumulative growth ratio is compared with the average value, and the tendency of the polygonization of the roller to grow or decline can be evaluated based on whether the difference between the absolute value and the average value is above a threshold. For example, in the case where there is a polygon number N with a locally small absolute value of the positive or negative cumulative growth ratio, it can be evaluated that the polygonization of that polygon number N is a state of saturated growth that neither grows nor declines.

[0149] [7] In several embodiments, based on the method described in [4] above,

[0150] In the evaluation step, the wear of the roller is evaluated based on at least one of the plurality of positive cumulative growth ratios and the plurality of negative cumulative growth ratios obtained respectively corresponding to the plurality of polygon numbers N.

[0151] The positive and negative cumulative growth ratios for a specific number of polygons N are correlated with the amount of wear caused by polygonization of the rolls corresponding to each number of polygons N. According to the method described above [7], for each of the plurality of numbers of polygons N, the amount of wear of the rolls can be evaluated based on at least one of the positive and negative cumulative growth ratios.

[0152] [8] In several embodiments, based on the method described in any one of [1] to [7] above,

[0153] In the evaluation step, for each of the plurality of polygon numbers N, a first rotational speed (f1) of the roller corresponding to the rotational number in which the vibration amplitude becomes the largest among the plurality of rotational numbers is obtained, and based on the correlation between the number of polygons N of the roller and the first rotational speed, the inherent vibration frequency of the machinery including the roller is obtained.

[0154] For each polygon number N, when the product of the roller rotation speed and the polygon number N is consistent with the natural vibration frequency, there is a tendency for the vibration amplitude to become extremely large. Furthermore, for multiple polygon numbers N, when the product of the roller rotation speed and the polygon number N is a specific approximately constant value when the vibration amplitude of the roller is extremely large, this approximately constant value is highly likely to be the natural vibration frequency of the machine including the roller. According to the method described above [8], for each of the multiple polygon numbers N, the first rotation speed of the roller corresponding to the rotation number in which the vibration amplitude of the roller becomes extremely large among the multiple rotation numbers of the roller is obtained, so that the natural vibration frequency of the machine including the roller can be obtained based on the correlation between the polygon number N and the first rotation speed. For example, when the product of the first rotation speed and the polygon number N is a specific approximately constant value in the above correlation, this approximately constant value is highly likely to be consistent with the natural vibration frequency of the machine including the roller. In this way, the natural vibration frequency of the machine including the roller can be determined.

[0155] [9] In several embodiments, based on the method described in any one of [1] to [8] above,

[0156] In the vibration data acquisition step, multiple portions of one or more metal plates are treated as the processing objects of the roller, and vibration data is acquired for each of the multiple portions.

[0157] In the index acquisition step, for each of the plurality of parts, an index corresponding to each of the plurality of polygon numbers N is acquired.

[0158] In the evaluation step, the wear condition of the roller is evaluated based on a comparison of the indicators obtained for each of the plurality of parts.

[0159] According to the method described above [9], vibration data is obtained for each of the multiple parts of one or more metal plates, and multiple indicators of vibration amplitude at frequencies corresponding to multiple polygon numbers N are obtained based on the vibration data. Therefore, the changes of multiple indicators corresponding to multiple polygon numbers N over time can be grasped. Thus, the changes in the wear state of the roller can be grasped in advance.

[0160]

[10] In several embodiments, based on any one of [1] to [9] above, the method includes:

[0161] Calculation step (S10) involves obtaining predicted values ​​for multiple indices corresponding to each of the plurality of polygon numbers N using a prediction model that employs the spring constant between the roller and the metal plate or between the roller and the other rollers; and

[0162] The correction steps (S12-S14) correct the prediction model by comparing the multiple indicators corresponding to each of the multiple polygon numbers N obtained in the indicator acquisition step with the predicted values ​​obtained in the calculation step.

[0163] According to the method described above

[10] , the prediction model can be corrected by comparing the predicted values ​​of the aforementioned multiple indicators corresponding to each of the multiple polygon numbers N obtained through calculation using the prediction model with the comparison of the aforementioned multiple indicators (indicators based on vibration measurement data) corresponding to each of the multiple polygon numbers N obtained in the indicator acquisition step, wherein the prediction model uses the spring constant between the roller and the metal plate or other rollers. Therefore, the prediction accuracy of the aforementioned multiple indicators can be improved, and the accuracy of the evaluation of the roller wear condition based on the predicted multiple indicators can be improved.

[0164]

[11] The method of operation of at least one embodiment of the present invention is a method of operation of a machine (e.g., a rolling device 2) including a roller (e.g., a rolling roll 3) and for processing a metal sheet (S) using said roller, wherein the method includes:

[0165] The steps (S2-S6) for obtaining the evaluation result of the wear state of the roller using the wear state evaluation method described in any one of [1] to

[10] above; and

[0166] The step of changing the rotational speed of the roller based on the evaluation results.

[0167] According to the method described above

[11] , since the rotational speed of the roller is changed based on the result of evaluating the wear state of the roller by the method described above [1], the growth of polygonization generated on the roller can be appropriately suppressed.

[0168]

[12] The roller wear condition evaluation device (51) of at least one embodiment of the present invention includes:

[0169] The vibration data acquisition unit (52) is configured to change the rotational speed of a roller that rotates while in contact with a metal plate or other rollers, and acquire vibration data representing the vibration of the roller after multiple rotations of the roller.

[0170] The index acquisition unit (54) is configured to, based on the vibration data, acquire an index of the vibration amplitude at a frequency corresponding to the number of sides N for each of the plurality of polygon numbers N of the roller, using each number of rotations of the roller; and

[0171] The evaluation unit (60) is configured to evaluate the wear condition of the roller based on a plurality of indicators obtained corresponding to each of the plurality of polygon numbers N.

[0172] In the structure described above

[12] , since the vibration data of the roller is obtained while the rotational speed of the roller is changed, multiple indicators of the vibration amplitude at frequencies corresponding to the multiple polygon numbers N of the roller can be obtained based on the vibration data obtained in a relatively short period of time. Furthermore, the wear state (polygonization, etc.) of the roller can be grasped based on these multiple indicators. Therefore, according to the structure described above

[12] , the wear state of the roller can be grasped in advance.

[0173]

[13] The operating device (50) of at least one embodiment of the present invention is an operating device for a machine that includes a roller (e.g., a rolling roller 3) and is used to process a metal sheet (S) using the roller, and it comprises:

[0174] The wear condition evaluation device (51) described above

[12] is configured to obtain an evaluation result of the wear condition of the roller; and

[0175] The control unit (64) is configured to change the rotational speed of the roller based on the evaluation results.

[0176] According to the structure described above

[13] , since the rotational speed of the roller is changed based on the result of evaluating the wear state of the roller by the wear state evaluation device described above

[12] , the growth of polygonization in the roller can be appropriately suppressed.

[0177]

[14] The rolling apparatus (1) of at least one embodiment of the present invention comprises:

[0178] The rolling apparatus (2) includes rolls (rolling rolls 3) for rolling a metal sheet (S); and

[0179] The wear condition evaluation device described above

[12] is configured to evaluate the wear condition of the roller.

[0180] In the structure described above

[14] , since the vibration data of the roller is obtained while the rotational speed of the roller is changed, multiple indicators of the vibration amplitude at frequencies corresponding to the multiple polygon numbers N of the roller can be obtained based on the vibration data obtained in a relatively short period of time. Furthermore, the wear state (polygonization, etc.) of the roller can be grasped based on these multiple indicators. Therefore, according to the structure described above

[14] , the wear state of the roller can be grasped in advance.

[0181] The embodiments of the present invention have been described above, but the present invention is not limited to the embodiments described above, and also includes modifications to the embodiments described above, and appropriate combinations of these modifications.

[0182] In this specification, expressions such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" that indicate relative or absolute configuration not only mean such configuration in a strict sense, but also indicate a state of relative displacement by angle or distance with tolerance or to the extent that the same function can be obtained.

[0183] For example, expressions such as "same," "equal," and "homogeneous" that indicate the state of equality of things not only indicate a state of strict equality, but also indicate a state of difference in the degree to which the same function can be obtained due to the existence of tolerances.

[0184] Furthermore, in this specification, the terms "quadrilateral shape," "cylindrical shape," etc., which refer to shapes, not only refer to shapes in a strictly geometric sense, but also to shapes that include concave and convex parts, chamfered parts, etc., within the range where the same effect can be obtained.

[0185] Furthermore, in this specification, expressions such as "possessing," "containing," or "having" a constituent element are not exclusive expressions that exclude the existence of other constituent elements.

[0186] Explanation of reference numerals in the attached figures:

[0187] 1. Rolling equipment

[0188] 2 Rolling equipment

[0189] 3 Rolling rolls

[0190] 4A working roll

[0191] 4B working roll

[0192] 5A Roller Bearing Housing

[0193] 5B Roller Bearing Housing

[0194] 6A support roller

[0195] 6B support roller

[0196] 7A Roller Bearing Housing

[0197] 7B Roller Bearing Housing

[0198] 8 Pressing device

[0199] 10 rolling mill stands

[0200] 10A Rolling Mill Stand

[0201] 10B Rolling Mill Stand

[0202] 10C Rolling Mill Stand

[0203] 50 Operating device

[0204] 51 Wear Condition Evaluation Device

[0205] 52 Vibration Data Acquisition Department

[0206] 54 indicators achieved

[0207] 60 Evaluation Department

[0208] 64 Control Department

[0209] 66 Output Section

[0210] 68 Display Section

[0211] 70 motors

[0212] 90 Vibration Measurement Department

[0213] 91 Accelerometer

[0214] 92 Accelerometer

[0215] 93 Accelerometer

[0216] 94 Accelerometer

[0217] 96 Rotation Measurement Department

[0218] S Metal plate.

Claims

1. A method for evaluating the wear condition of a roller, wherein, The method for evaluating the wear condition of the roller includes: The vibration data acquisition step involves changing the rotational speed of a roller that rotates while in contact with a metal plate or other rollers, and acquiring vibration data representing the vibration of the roller over multiple rotations of the roller. The index acquisition step involves, based on the vibration data, acquiring an index of the vibration amplitude at a frequency corresponding to the number of sides N for each of the plurality of polygon numbers N of the roller, using each number of rotations of the roller; and The evaluation step assesses the wear condition of the roller based on a plurality of indicators obtained corresponding to each of the plurality of polygon numbers N.

2. The method for evaluating the wear condition of a roller according to claim 1, wherein, In the index acquisition step, based on the vibration data, for each of the plurality of polygon numbers N, the sum of the vibration amplitudes at the frequency corresponding to the polygon number N for each rotation number of the roller, i.e., the cumulative vibration amplitude, is obtained as the index. In the evaluation step, based on the cumulative vibration amplitudes obtained corresponding to the plurality of polygon numbers N, a specific polygon number N for polygonal growth or decay in the roller is determined.

3. The method for evaluating the wear condition of a roller according to claim 1, wherein, In the index acquisition step, based on the vibration data, for each of the plurality of polygon numbers N, an index using the vibration amplitude growth ratio is obtained. The vibration amplitude growth ratio is calculated based on the ratio of the vibration amplitude at the frequency corresponding to the polygon number N in the second rotation after the first rotation to the vibration amplitude at the frequency corresponding to the polygon number N in the first rotation. In the evaluation step, the tendency of polygonization growth or decline in the roller is evaluated based on a plurality of indicators obtained corresponding to the plurality of polygon numbers N.

4. The method for evaluating the wear condition of a roller according to claim 3, wherein, For each of the plurality of polygon numbers N, the index using the vibration amplitude growth ratio includes the sum of the growth ratios with positive values, i.e., the positive cumulative growth ratio, or the sum of the growth ratios with negative values, i.e., the negative cumulative growth ratio. In the evaluation step, the tendency of polygonization growth or decay in the roller is evaluated based on at least one of the plurality of positive cumulative growth ratios and the plurality of negative cumulative growth ratios obtained respectively corresponding to the plurality of polygon numbers N.

5. The method for evaluating the wear condition of a roller according to claim 4, wherein, In the evaluation step, the tendency for polygonization growth or decay in the roller is evaluated by comparing a value representing the deviation of at least one of the plurality of positive cumulative growth ratios and the plurality of negative cumulative growth ratios obtained corresponding to the plurality of polygon numbers N with a threshold.

6. The method for evaluating the wear condition of a roller according to claim 4, wherein, In the evaluation step, the tendency for polygonization growth or decay in the roller is evaluated based on whether the absolute value of the index for a specific number of polygons N is smaller than the average of the absolute values ​​of the indexes for the plurality of numbers of polygons N, and whether the difference between the average of the absolute values ​​of the indexes for the plurality of numbers of polygons N and the absolute value of the index for the specific number of polygons N is above a threshold.

7. The method for evaluating the wear condition of a roller according to claim 4, wherein, In the evaluation step, the wear of the roller is evaluated based on at least one of the plurality of positive cumulative growth ratios and the plurality of negative cumulative growth ratios obtained respectively corresponding to the plurality of polygon numbers N.

8. The method for evaluating the wear condition of a roller according to any one of claims 1 to 7, wherein, In the evaluation step, for each of the plurality of polygon numbers N, a first rotational speed of the roller corresponding to the rotational number in which the vibration amplitude becomes extremely large among the plurality of rotational numbers is obtained, and based on the correlation between the number of polygons N of the roller and the first rotational speed, the inherent vibration frequency of the machinery including the roller is obtained.

9. The wear condition evaluation method according to any one of claims 1 to 7, wherein, In the vibration data acquisition step, multiple portions of one or more metal plates are treated as the processing objects of the roller, and vibration data is acquired for each of the multiple portions. In the index acquisition step, for each of the plurality of parts, an index corresponding to each of the plurality of polygon numbers N is acquired. In the evaluation step, the wear condition of the roller is evaluated based on a comparison of the indicators obtained for each of the plurality of parts.

10. The wear condition evaluation method according to any one of claims 1 to 7, wherein, The wear condition evaluation method includes: The calculation steps involve obtaining predicted values ​​for multiple indices corresponding to each of the plurality of polygon numbers N using a prediction model that employs the spring constant between the roller and the metal plate or between the roller and other rollers; and The correction step corrects the prediction model by comparing the plurality of indicators corresponding to each of the plurality of polygon numbers N obtained in the indicator acquisition step with the predicted values ​​obtained in the calculation step.

11. A method of operating a machine comprising rollers and for processing a metal sheet using said rollers, wherein, The operation method includes: The step of obtaining an evaluation result of the wear state of the roller using the wear state evaluation method according to any one of claims 1 to 7; and The step of changing the rotational speed of the roller based on the evaluation results.

12. A device for evaluating the wear condition of a roller, wherein, The wear condition evaluation device for the roller includes: The vibration data acquisition unit is configured to change the rotational speed of a roller that rotates while in contact with a metal plate or other rollers, and acquire vibration data representing the vibration of the roller after multiple rotations of the roller; The index acquisition unit is configured to acquire, based on the vibration data, an index of the vibration amplitude at a frequency corresponding to the number of sides N for each of the plurality of sides N of the roller, using each number of rotations of the roller; as well as The evaluation unit is configured to evaluate the wear condition of the roller based on a plurality of indicators obtained corresponding to each of the plurality of polygon numbers N.

13. A rotating device, comprising rollers and used for processing a metal sheet using said rollers, wherein, The operating device includes: The wear condition evaluation apparatus of claim 12 is configured to obtain an evaluation result of the wear condition of the roller; and The control unit is configured to change the rotational speed of the roller based on the evaluation results.

14. A rolling mill, wherein, The rolling equipment includes: A rolling apparatus, comprising rolls for rolling a sheet of metal; and The wear condition evaluation device according to claim 12 is configured to evaluate the wear condition of the roller.

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