WO2021024448A1 - Method for assisting operation of rolling facility, operation assistance device, and rolling facility - Google Patents

Abstract

This method for assisting operation of a rolling facility comprises a target rotational speed acquisition step for acquiring the rotational speed fr of a rolling roll, and a step for outputting the acquired rotational speed fr as a target rotational speed. In the target rotational speed acquisition step, the correlation between the rotational speed fr and a characteristic value σ, which indicates an N-gon-forming tendency for the rolling roll to form into an N-gon by being subjected to uneven wear when rolling is performed at the rotational speed fr, is used as a basis upon which to acquire the rotational speed fr that corresponds to a characteristic value σ indicating that the rolling roll is forming into an N-gon in a slowed or attenuated manner.

Description

Rolling equipment operation support method and operation support equipment and rolling equipment

This disclosure relates to an operation support method for rolling equipment, an operation support device, and a rolling equipment.

In rolling a metal plate or the like with a rolling apparatus including a rolling roll, the occurrence of defects in the rolled product may be detected or suppressed based on the measurement result of vibration of the rolling apparatus.

For example, in Patent Document 1, vibration is detected by a vibration sensor installed in a housing of a rolling mill or a roll chock, and based on the result of frequency analysis of the obtained vibration data, a striped shape that may occur in a metal plate to be rolled. It is described that the resonance phenomenon (chattering) of the rolling mill, which may cause a flaw (chatter mark), is detected.

Japanese Unexamined Patent Publication No. 2018-118312

By the way, if the rolling of a material such as a metal plate is continued in a rolling apparatus including a rolling roll, N-sided formation may occur in which the cross-sectional shape of the rolling roll approaches a specific N-sided shape. When the rolling roll is formed into an N-gonal shape and grows, irregularities corresponding to the N-sided shape of the rolling roll are formed on the surface of the material rolled by the rolling roll, which may cause a problem in product quality. Therefore, it is desired to suppress the growth of N-sided rolling rolls and suppress the deterioration of product quality.

In view of the above circumstances, at least one embodiment of the present invention aims to provide an operation support method and operation support device for rolling equipment and a rolling equipment capable of suppressing the growth of N-polygonization of a rolling roll.

The operation support method for rolling equipment according to at least one embodiment of the present invention is
Based on the correlation between the rotation speed fr of the rolling roll and the characteristic value σ showing the growth tendency of N-polygonization in which the rolling roll is unevenly worn and becomes N-gonal when rolling is performed at the rotation speed fr. , A target rotation speed acquisition step for acquiring the rotation speed fr corresponding to the characteristic value σ indicating that the N-squared formation of the rolling roll is slowed or attenuated.
A step of outputting the acquired rotation speed fr as a target rotation speed, and
To be equipped.

According to at least one embodiment of the present invention, an operation support method and operation support device for rolling equipment and a rolling equipment capable of suppressing the growth of N-polygonization of a rolling roll are provided.

It is a schematic diagram of the rolling equipment which concerns on one Embodiment. It is a schematic block diagram of the driving support device which concerns on one Embodiment. It is a schematic flowchart of the operation support method of the rolling mill which concerns on one Embodiment. It is a schematic diagram of an example of the frequency spectrum of the vibration of a rolling roll. It is a figure which shows an example of the time change of the rotation speed fr of a rolling roll. It is a figure which shows an example of the time change of the vibration amplitude corresponding to the N-sided polygon of a rolling roll. It is a figure which shows an example of the correlation (characteristic diagram) of the rotation speed fr of a rolling roll and a characteristic value σ. It is a chart which shows an example of the history of the evaluation coefficient Ψ at the time of execution of the driving support method which concerns on one Embodiment. This is an example of a characteristic diagram showing the correlation between the rotation speed fr of the rolling roll and the characteristic value σ. It is a figure which shows the state of the vibration amplitude corresponding to the N-sided polygon of a rolling roll. It is a figure which shows the state of the characteristic value σ corresponding to the N-sided polygon of a rolling roll. It is a figure which shows the state of the evaluation coefficient Ψ corresponding to the N-sided polygon of a rolling roll. It is a schematic diagram of the rolling apparatus in which N-sided formation of a rolling roll occurs.

Hereinafter, some embodiments of the present invention will be described 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 to this, but are merely explanatory examples. Absent.

FIG. 1 is a schematic view of a rolling equipment to which an operation support method and an operation support device according to some embodiments are applied. As shown in FIG. 1, the rolling equipment 1 according to the embodiment includes a rolling apparatus 2 including a rolling stand 10 configured to roll a metal plate S, and an operation support for supporting the operation of the rolling apparatus 2. The device 50 and the like are provided. Further, the rolling equipment 1 is provided with a vibration measuring unit 90 for measuring the vibration of the rolling roll 3 constituting the rolling stand 10.

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

In the rolling apparatus 2 shown in FIG. 1, the rolling roll 3 is placed on the side opposite to the metal plate S with the pair of work rolls 4A and 4B provided so as to sandwich the metal plate S and the pair of work rolls 4A and 4B. It is provided and includes a pair of backup rolls 6A, 6B for supporting the pair of work rolls 4A, 4B, respectively. The work rolls 4A and 4B are rotatably supported by roll chock 5A and 5B, respectively. The backup rolls 6A and 6B are rotatably supported by roll chock 7A and 7B, respectively. The roll chock 5A, 5B and the roll chock 7A, 7B are supported by a housing (not shown).

In the rolling equipment 1 shown in FIG. 1, the vibration measuring unit 90 includes acceleration sensors 91 to 94 attached to the roll chocks 5A, 5B, 7A, and 7B, respectively. The acceleration sensors 91 to 94 vibrate in any direction of the roll chock 5A, 5B, 7A, 7B (for example, the vertical direction, the horizontal direction, and / or the rotation axis direction of the rolling roll 3), that is, the work roll 4A. , 4B and backup rolls 6A, 6B are configured to detect vibrations in any direction. The above-mentioned vibration signal detected by the acceleration sensors 91 to 94 is sent to the driving support device 50.

In another embodiment, the vibration measuring unit 90 may include a displacement detecting unit configured to measure the displacement of the rolling roll 3 in any direction. In this case, the vibration of the rolling roll 3 may be calculated based on the measurement result by the displacement detection unit. As the displacement detection unit, for example, a displacement meter of a laser type or an eddy current type can be used. Alternatively, an imaging device (camera or the like) can be used as the displacement detection unit. In this case, the vibration of the rolling roll 3 may be calculated by imaging one part of the rolling roll 3 with an imaging device and performing image processing on the obtained imaging data.

FIG. 2 is a schematic configuration diagram of the driving support device 50 according to the embodiment. As will be described in detail later, the operation support device 50 is configured to support the operation of the rolling device 2 so that N-polygonization due to uneven wear of the rolling roll 3 does not grow. The operation support device 50 is configured to receive a signal indicating the vibration of the rolling roll 3 from the vibration measuring unit 90 and a signal indicating the rotation speed of the rolling roll 3 measured by the roll rotation speed measuring unit 95. There is.

Further, the driving support device 50 is configured to acquire information from the storage unit 96. The storage unit 96 has a correlation between the rotation speed fr of the rolling roll 3 and the characteristic value σ indicating the growth tendency of N-polygonization due to uneven wear of the rolling roll 3 when rolling is performed at the rotation speed fr. The characteristic diagram shown is stored.

The operation support device 50 includes a vibration data acquisition unit 52, a frequency analysis unit 54, and an amplitude extraction unit 56 for processing information received from the above-mentioned vibration measurement unit 90, roll rotation speed measurement unit 95, or storage unit 96. The target rotation speed acquisition unit 63, the output unit 72, and the like are included.

The driving support device 50 may include a CPU, a memory (RAM), an auxiliary storage unit, an interface, and the like. The driving support device 50 receives signals from various measuring instruments (such as the above-mentioned vibration measuring unit 90 or roll rotation speed measuring unit 95) via an interface. The CPU is configured to process the signal received in this way. Further, the CPU is configured to process a program expanded in the memory.

The processing content of the driving support device 50 may be implemented as a program executed by the CPU and stored in the auxiliary storage unit. When the programs are executed, these programs are expanded in memory. The CPU reads the program from the memory and executes the instructions included in the program.

In the rolling apparatus 2 described above, if the rolling of the metal plate S is continued at a specific rotation speed, N-polygonization may occur in which the cross-sectional shape of the rolling roll 3 approaches a specific N-polygon. Here, FIG. 11 is a schematic view of a rolling apparatus in which the rolling roll 3 is N-sided. The rolling apparatus 2 shown in FIG. 11 includes a plurality of rolling stands 10A to 10C. The cross-sectional shape of the rolling roll 3 orthogonal to the axial direction usually has a circular shape like the rolling roll 3 of the rolling stand 10A or 10C, but the rolling roll 3 (work rolls 4A, 4B) of the rolling stand 10B shown in FIG. The cross-sectional shapes of the backup rolls 6A and 6B) are N-polygons (specifically, dodecagonal), and these rolling rolls 3 are N-sided. When the rolling roll 3 is formed into an N-gonal shape and grows, irregularities corresponding to the N-sided shape of the rolling roll 3 are formed on the surface of the metal plate S rolled by the rolling roll 3, which may cause a problem in product quality. is there.

In order to solve the above-mentioned problems, the operation support device 50 according to some embodiments has a configuration capable of suppressing the growth of N-polygonization of the rolling roll 3. That is, the target rotation speed acquisition unit 63 of the operation support device 50 rolls based on the correlation between the rotation speed fr of the rolling roll 3 and the characteristic value σ (that is, based on the characteristic diagram acquired from the storage unit 96). It is configured to acquire the rotation speed fr corresponding to the characteristic value σ indicating that the N-gonification of the roll 3 is blunted or attenuated. Further, the output unit 72 is configured to output the rotation speed fr acquired by the target rotation speed acquisition unit 63 as the target rotation speed.

In some embodiments, the target rotation speed is output to the rotation speed control unit 99 for controlling the rotation speed of the rolling roll 3 via the output unit 72. The rotation speed control unit 99 may be configured to control the drive motor of the rolling roll 3 so that the rotation speed of the rolling roll 3 becomes the target rotation speed. Further, in some embodiments, the target rotation speed is output to the display unit 98 (display or the like) via the output unit 72. In this case, the operator may appropriately change the rotation speed of the rolling roll 3 based on the target rotation speed displayed on the display unit 98.

Note that FIG. 11 schematically shows how dodecagonization (N = 12) occurs in each rolling roll 3 of the rolling stand 10B, but in an actual rolling apparatus, the rotation of the rolling roll 3 is performed. Depending on the operating conditions such as the number, an N-sided polygon having an N of about 50 or about 100 may occur in the rolling roll 3.

Further, depending on the operating conditions and specifications (natural frequency, etc.) of the rolling apparatus 2, the rolling rolls 3 may be N-polygonalized at a specific rolling stand 10, or a plurality of rolling rolls 3 constituting one rolling stand may be formed. Of these, N-sided formation may occur on a specific rolling roll 3 (work rolls 4A, 4B or backup rolls 6A, 6B). For example, in the case of hot rolling performed at a relatively high temperature, N-polygonization is relatively likely to occur in the work rolls 4A and 4B. Further, in the case of cold rolling performed at a relatively low temperature, N-polygonization is relatively likely to occur in the backup rolls 6A and 6B.

Next, the operation support method of the rolling apparatus 2 according to some embodiments will be described.
In some embodiments, a method of supporting the operation of the rolling apparatus by using the above-described operation support device 50 will be described, but in some embodiments, a part of the processing by the operation support device 50 described below or The operation of the rolling mill 2 may be assisted by manually performing all the steps.

Hereinafter, the operation support method of the rolling mill according to some embodiments will be described more specifically. In the following, a method of supporting the operation of the rolling apparatus 2 by using the above-mentioned operation support device 50 will be described, but in some embodiments, a part of the processing by the operation support device 50 described below or The operation of the rolling mill 2 may be assisted by manually performing all the steps.

FIG. 3 is a schematic flowchart of an operation support method for the rolling mill according to the embodiment. In the flowchart of FIG. 3, “i” means the number of times the rotation speed of the rolling roll 3 is set (changed) (that is, the setting of the rotation speed of the rolling roll 3 for the i-th time), and “fr _i ” and “A _i ”. The symbols with the subscript i such as, etc. indicate that they are at the time of rolling at the i-th rotation speed setting.
FIG. 4 is a schematic diagram of an example of the frequency spectrum of the vibration of the rolling roll 3 obtained in the frequency analysis step (step S206) described below. FIG. 5A is a diagram showing a time change of the rotation speed fr of the rolling roll 3 when the operation support method according to the embodiment is executed. FIG. 5B is a diagram showing a time change of the vibration amplitude (described later) corresponding to the N-sided shape of the rolling roll 3 when the operation support method according to the embodiment is executed.

In the method according to one embodiment, first, the rotation speed of the rolling roll 3 is set to fr _i (i = 1 at the first time), the rolling apparatus 2 is operated at the rotation speed fr _i , and the metal plate S is rolled. (Step S202). The rotation speed fr _i of the rolling roll 3 is unchanged until it is changed to the rotation speed fr _{i + 1} in step S222 described later.

Then, the vibration data acquisition unit 52, while rolling at a rotation speed fr _i of the rolling rolls 3, obtains vibration data indicating the vibration of the rolling rolls 3 at every sampling period dt (see FIGS. 5A and 5B) ( Vibration data acquisition step; step S204). As the vibration data, the vibration data acquired by the vibration measuring unit 90 may be acquired by the vibration data acquiring unit 52.

Next, the frequency analysis unit 54 performs frequency analysis on each of the vibration data acquired for each sampling period dt, and acquires the frequency spectrum of the vibration data (frequency analysis step; step S206). By performing frequency analysis on the vibration data acquired in a certain sampling period dt, for example, the frequency spectrum shown in FIG. 4 can be obtained.

Then, based on the frequency spectrum obtained as a result of frequency analysis by the amplitude extraction unit 56, the amplitude of vibration at the frequency (fr _i × N) corresponding to the specific N polygon _Ai (hereinafter, the vibration amplitude corresponding to the N polygon). Acquire (also referred to as A _i or the like) (amplitude acquisition step; step S2086) (see FIG. 4). By performing frequency analysis (step S206) and extraction of the vibration amplitude corresponding to the N-side polygon (step S208) for each of the vibration data acquired for each sampling period dt in step S204, the vibration amplitude A for each sampling period dt. _i is obtained (see FIG. 5B).

Vibration amplitude _{A i} obtained for each of the vibration data at step S208, together with the rotational speed fr _i of the rolling rolls 3, is recorded in the recording unit 60 (see FIG. 2). The information of the rotation speed fr _i and the vibration amplitude A _i recorded in the recording unit 60 is used for the calculation of the evaluation coefficient Ψ described later.

Here, for example, as shown in FIGS. 5A and 5B, the tendency of the vibration amplitude A corresponding to a specific N-gon to change with time (increase or decrease, and its speed, etc.) according to the rotation speed fr of the rolling roll 3. Is different. In the example shown in FIGS. 5A and 5B, at the rotation speed fr ₁ (i = 1) of the rolling roll 3, the vibration amplitude A ₁ corresponding to the N-sided polygon increases with the passage of time. This indicates that the N-polygonization is growing in the rolling roll 3, that is, the shape of the cross section orthogonal to the axial direction of the rolling roll 3 is deformed from a circle to an N-sided shape. Further, in the examples shown in FIGS. 5A and 5B, at the rotation speed fr ₂ (i = 2) of the rolling roll 3, the vibration amplitude A ₂ corresponding to the N-sided polygon decreases with the passage of time. This indicates that the N-sided formation is attenuated in the rolling roll 3, that is, the shape of the cross section orthogonal to the axial direction of the rolling roll 3 is deformed from the N-sided shape to approach a circle.

For a plurality of types of N polygons (N = N ₁ , N ₂ , N ₃ ...), the tendency of the vibration amplitude A to change with time at the same rotation speed fr is independent of each other. For example, the rotational speed fr _1, the vibration amplitude A corresponding to the N ₁ square whereas increases with the trend of time, the vibration amplitude A corresponding to different N ₂ prismatic and N ₁ square involves a tendency of the time May decrease. Further, the rotational speed fr2, the vibration amplitude A corresponding to the N ₁ square while decreases with the trend of time, the vibration amplitude A corresponding to the N ₂ square sometimes increase with the trend of time. That is, in the rolling roll 3, in certain rotational speed fr, to attenuate the growth and N ₂ square of N ₁ square of sometimes occur at the same time, also, the other rotational speed fr, the attenuation of the N ₁ square of growth of N ₂ square of there can occur at the same time. Further, in the rolling roll 3, in certain rotational speed fr, N ₁ to the square of growth and N ₂ square of growth may occur simultaneously, or in certain rotational speed fr, N ₁ square of attenuation and N ₂ square Attenuation of conversion can occur at the same time.

Next, in step S208, the amplitude comparing unit 59 (see FIG. 2), the vibration amplitude _{A i} acquired every sampling period dt, compared with the control value _{A iM} of the vibration amplitude (Step S212). The control value A _iM is a value determined so as not to deteriorate the quality of the metal plate S to be rolled, and is determined so that, for example, a chatter mark is not formed on the surface of the metal plate S. The control value A _iM may be determined from the past operation results of the rolling mill 2. Further, different control values A _iM may be set according to the number N of polygons.

Step If the obtained vibration amplitude A _i is smaller than the management value A _iM in S208 (No in step S212), the vibration amplitude A _i to the extent that affected leaves on the quality of the metal plate S to be rolled is not increased , It can be judged that the N-sided polygonation of interest in the rolling roll 3 has not grown excessively. Therefore, since it is not yet necessary to attenuate or delay (blunt) the N-polygonization on the rolling roll 3, the rotation speed fr of the rolling roll 3 is maintained as fr _i without being changed, and the process returns to step S202 to step. The procedure after S202 is repeated.

On the other hand, if the vibration amplitude _{A i} obtained at step S208 is greater than the management value _{A iM} (Yes in step S212), the vibration amplitude _{A i} is increased to the extent that leaves affect the quality of the metal plate S to be rolled There may be (ie, N-gonation is growing). Therefore, in steps S214 to S218 described below, it is determined whether or not the N-polygonization has grown to the extent that the quality of the rolled metal plate S is affected.

At step S214, the by evaluation coefficient calculation unit 67 (see FIG. 2), to calculate an evaluation coefficient Ψ showing the growth degree of the vibration amplitude A _i relative to the given time.
Here, the vibration amplitude corresponding to the N-sided polygon acquired immediately after changing the rotation speed of the rolling roll 3 to the i-th rotation speed setting value fr _i is set to A _iS , and the (i + 1) rotation speed setting value fr _{i + 1 is} set. Let A _{iE be} the vibration amplitude corresponding to the N-gon acquired immediately before the change to (the number of rotations at this time is fr _i ) (see FIG. 5B).

According to the findings of the present inventors, the vibration amplitude A corresponding to the N-sided polygon increases or decreases exponentially during rolling under the condition that the rotation speed of the rolling roll 3 is constant. Then, during rolling at the rotation speed fri of the rolling roll 3, the vibration amplitude _{Ai_t1} corresponding to the N-sided polygon at a certain time t1 and the vibration amplitude _{Ai_t2} corresponding to the N-sided polygon at the time t2 after Δt from the time t1 are _expressed by the following equations. The relationship shown in (A) is satisfied.
A _{i_t2} / A _{i_t1} = exp (σ _i・ fr _i・ Δt)… (A)
Here, the above formula (A) σ _i is a characteristic value determined corresponding to the rotation speed fr _i of the rolling roll 3 (hereinafter, also simply referred to as “characteristic value σ”).

Accordingly, the acquisition time of the vibration amplitude A _iS above, if the length of time before the acquisition time of the vibration amplitude A _iE above and Delta] t _i, the ratio of the vibration amplitude A _iE the vibration amplitude A _iS (rpm growth ratio of the vibration amplitude _{a i} in fr _i) can be represented by the following formula (B).
_{A iE / A iS = exp (} σ i · fr i · Δt i) ... (B)

Then, by multiplying all the growth ratios (A _iE / A _iS ) of the above formula (B) for i = 1, 2, 3, ..., I, the following formula (C) is obtained.

The left side of the above formula (C) shows the degree of growth of the vibration amplitude Ai with reference to the vibration amplitude A _1S immediately after the rotation speed of the rolling roll 3 is set to fr ₁ (i = 1). Then, if the natural logarithm of the above equation (C) is taken, it can be expressed in the form shown in the following equation (D). This is defined as the evaluation coefficient Ψ.

If the evaluation coefficient Ψ is greater than zero, with respect to the vibration amplitude A of the reference time, the vibration amplitude A _i at the time of performing time rolling Delta] t _i at a rotation speed fr _i set to i th is increased, i.e. , Indicates that the N-sided formation of the rolling roll 3 has grown. Also, when the evaluation coefficient Ψ is less than zero, with respect to the vibration amplitude A of the reference time, the vibration amplitude A _i at the time period rolling was carried out in the i-th revolution speed fr _i in Delta] t _i set in decreased That is, it indicates that the N-sided formation of the rolling roll 3 has been attenuated.

Therefore, by repeating steps S202 to S224 (described later in steps S216 to S224) during the operation of the rolling apparatus 2, the rotation speed fr _i and the vibration amplitude A _i (vibration amplitude A _iS and vibration amplitude A _i S) recorded in the recording unit 60 are performed. Using the past history of (including _AiE ), the current evaluation coefficient Ψ can be calculated from the above equation (D).

In step S216, the evaluation coefficient comparison unit 69 (see FIG. 2) determines whether or not the evaluation coefficient Ψ calculated in step S214 is smaller than zero. When the evaluation coefficient Ψ is smaller than zero (Yes in step S216), it can be determined that the vibration amplitude A is smaller than the past reference time point (that is, the N-polygonization is attenuated). Therefore, since it is not yet necessary to attenuate or slow down (delay) the N-polygonization on the rolling roll 3, the rotation speed fr of the rolling roll 3 is maintained as fr _i without being changed, and the process returns to step S202 to return to step S202. Repeat the following steps.

On the other hand, when the evaluation coefficient Ψ is larger than zero in step S216 (No in step S216), it can be determined that the vibration amplitude A is larger than that at the reference time point in the past. That is, since there is a possibility that the vibration amplitude _Ai has increased to the extent that the quality of the rolled metal plate S is affected (that is, the N-sided polygonization is growing), the process proceeds to the next step S218. , It is determined whether or not it is necessary to change the rotation speed fri of the rolling roll 3.

In step S218, with respect to the vibration amplitude A _iS corresponding to the N polygon acquired immediately after changing the rotational speed of the rolling rolls 3 the current rotational speed fr _i, latest during rolling in the current rotational speed fr _i ( It is determined whether or not the ratio A _{i_N} / A _iS of the vibration amplitude A _{i_N} corresponding to the (most recently acquired) N polygon is smaller than 1.

After the case described above the ratio _{A i_N / A iS} is less than 1 (Yes in step S218), sets the rotational speed of the rolling rolls 3 the current rotational speed fr _i (change), the vibration amplitude Ai corresponding to the N polygon Since it is decreasing, it indicates that N-polygonization tends to decrease. Therefore, since it is not necessary to attenuate or delay (blunt) the N-polygonization on the rolling roll 3, the rotation speed fr of the rolling roll 3 is maintained as fr _i without being changed, and the process returns to step S202 to return to step S202 and thereafter. Repeat the procedure in.

On the other hand, when the ratio _{A i_N / A iS} above is greater than 1 (No in step S218), after setting the rotational speed of the rolling rolls 3 the current rotational speed fr _i (change), corresponding to the N polygon vibration amplitude Since Ai is increasing, it indicates that N-polygonization is a growth trend. As a result, it is determined that the vibration amplitude _Ai has increased to the extent that the quality of the rolled metal plate S is affected (N-polygonization is growing), and the process proceeds to step S220.

In step S220, the target rotation speed acquisition unit 63 bases the rolling roll 3 based on the correlation (characteristic diagram) between the rotation speed fr of the rolling roll and the characteristic value σ indicating the growth tendency of N-polygonization of the rolling roll 3. The rotation speed fr corresponding to the characteristic value σ indicating that the N-polygonization of is slowed down or attenuated is acquired as the target rotation speed. The acquired target rotation speed is output to the display unit 98 and the rotation speed control unit 99 via the output unit 72.

After step S220, in step S222, the output of the drive motor of the rolling roll 3 is adjusted so that the target rotation speed is the target rotation speed output via the output unit 72, and the rotation speed of the rolling roll 3 is changed. Then, the counter of the set number of rotations (change number) of the rolling roll 3 is added (step S224), the process returns to step S202, and the steps after step S202 are repeated.

According to the method according to the above-described embodiment, the characteristic value σ indicating that the N-polygonization of the rolling roll 3 is slowed or attenuated based on the correlation between the rotation speed fr of the rolling roll 3 and the above-mentioned characteristic value σ. The rotation speed fr corresponding to is acquired, and the rotation speed fr is output as the target rotation speed. Therefore, by operating the rolling apparatus 2 to roll the metal plate S so that the rotation speed of the rolling roll 3 becomes the output target rotation speed, the N-square formation of the rolling roll 3 is slowed (delayed) or delayed. It can be attenuated. As a result, it is possible to suppress the growth of N-polygonization of the rolling roll 3 and suppress the deterioration of the quality of the rolled product (metal plate S).

Here, FIG. 6 is a diagram showing a typical example of the correlation (characteristic diagram) between the rotation speed fr of the rolling roll 3 and the characteristic value σ indicating the growth tendency of the N-sided polygonization of the rolling roll 3. The parameter Φ on the horizontal axis of the graph of FIG. 6 is a parameter represented by Φ = fr × N / fn (where fn is the natural frequency of the rolling roll 3). Since N is a specific natural number (polygonal number) and fn can be considered to be substantially constant regardless of the material and thickness of the metal plate to be rolled, Φ is the rotation of the rolling roll 3. It is roughly proportional to the number fr.

The characteristic value σ _i corresponding to the rotation speed fr _i can be defined as shown in the following equation (E) by, for example, modifying the above equation (B).
σ _i = ln (A _iE / A _iS ) / (fr _i · Δt _i )… (E)
Therefore, during rolling at various rpm fr in the rolling rolls 3, correlation by acquiring the vibration amplitude A _iS and A _iE corresponding to N square, and the characteristic value sigma, the rotational speed fr (Fig. The characteristic diagram shown in 6) can be obtained. The characteristic diagram showing the correlation between the rotation speed fr and the characteristic value σ may be prepared in advance based on the past operation results of the rolling apparatus 2.

The above-mentioned characteristic value σ (for example, calculated based on the above formula (E)) is the amplitude of the vibration frequency of the rolling roll 3 corresponding to the N-polygon (that is, that is, during rolling at the rotation speed fr of the rolling roll 3). It is an index of the tendency of the change with time of the vibration amplitude corresponding to the N-sided polygon.

That is, when the above-mentioned characteristic value σ is larger than zero, (A _iE / A _iS ) in the right side of the above equation (E) becomes larger than 1. Therefore, when the characteristic value σ is larger than zero, it means that the vibration amplitude corresponding to the N-polygon increases at the rotation speed fr corresponding to the σ, that is, the N-sided formation of the rolling roll 3 grows. On the other hand, when the above-mentioned characteristic value σ is smaller than zero, (A _iE / A _iS ) in the right side of the above equation (E) becomes smaller than 1. Therefore, the fact that the characteristic value σ is smaller than zero indicates that the vibration amplitude corresponding to the N-polygon decreases at the rotation speed fr corresponding to the σ, that is, the N-polygonization of the rolling roll 3 is attenuated.

Further, the formula property values σ calculated by (E), to a molecule of the right side of the above formula (E), the vibration amplitude of the aforementioned, includes the time (Delta] t _i) to change from A _iS to A _iE Therefore, it indicates the change in vibration amplitude per unit time. Therefore, in the region where the characteristic value σ is positive, it is evaluated that the larger the characteristic value σ is, the larger the increase rate of the vibration amplitude A corresponding to the N-side polygon is, and the faster the growth rate of the N-sided formation of the rolling roll 3 is. be able to. Further, in the region where the characteristic value σ is negative, it is evaluated that the smaller the characteristic value σ is, the larger the decrease rate of the vibration amplitude A corresponding to the N-polygon is, and the faster the damping rate of the N-sided formation of the rolling roll 3 is. be able to.

For a plurality of types of N polygons (N = N1, N2, N3, ...), Curves (characteristic diagrams) showing the correlation between the rotation speed fr and the characteristic value σ can be obtained individually, but the graph shown in FIG. 6 shows. As described above, when graphing using the parameter Φ in which the rotation number fr is normalized by the natural frequency fn of the polygon number N and the rolling roll 3, the correlation curves (characteristic diagrams) for a plurality of types of N polygons almost overlap. ..

As shown in FIG. 6, in a typical characteristic diagram, Φ = 1 (that is, the frequency fr × N corresponding to the N polygon is equal to the natural frequency of the rolling roll 3 regardless of the number N of the polygons. In the vicinity of fr) and in the region of Φ <1, there are Φ (Φ = α2 and Φ = α1) (that is, the number of rotations) in which σ becomes zero.

Then, in the rotation speed region of α1 <Φ <α2, σ is larger than zero, and in particular, σ is maximized when Φ≈α2. That is, in this rotation speed region, the N-polygonization of the rolling roll 3 grows (progresses), and the larger the σ, the faster the growth rate of the N-polygonization of the rolling roll 3. On the other hand, in the rotation speed region of Φ <α1 and Φ> α2, σ is smaller than zero. That is, in this rotation speed region, the N-polygonization of the rolling roll 3 is attenuated, and the smaller the σ, the faster the attenuation speed of the N-gonification of the rolling roll 3. When σ = 0, the N-sided formation of the rolling roll 3 does not grow or decay.

In some embodiments, the characteristic value σ is the rolling roll 3 at a frequency corresponding to the N-polygon during rolling at the rolling speed fr of the rolling roll 3, for example, as defined by the above equation (E). It is an index of the rate of change of the amplitude of vibration. Then, in step S220 described above (in the target rotation speed acquisition step, the rotation speed fr whose characteristic value σ is smaller than the current value is set as the target based on the correlation between the rotation speed fr of the rolling roll 3 and the characteristic value σ. Obtained as the number of revolutions.

For example, in the characteristic diagram shown in FIG. 6 (characteristic diagram for a specific N-sided polygon), it is assumed that points P1 to P5 on a curve showing a correlation system between the rotation speed fr (or parameter Φ) and the characteristic value σ exist. .. Assuming that the coordinates of each point Pj are Pi (Φj, σj), Φj at each point P1 to P5 satisfies the relationship of Φ1 (<α1) <Φ2 <Φ3 <Φ4 (<α2) <Φ5 (that is, at each point). The rotation speed frj satisfies the relationship of fr1 <fr2 <fr3 <fr4 <fr5). Further, σ3 at the point P3 is a maximum value of σ in the entire characteristic diagram. Further, σ2 and σ4 at points P2 and P4 are larger than zero, and σ1 and σ5 at points P1 and P5 are smaller than zero.

In the above-described embodiment, for example, assuming that the operating condition at point P2 (rolling roll rotation speed fr2) is obtained at the time when the target rotation speed is calculated in step S220 (before the rotation speed of the rolling roll 3 is changed), the step In S220, the rotation speed fr whose characteristic value σ is smaller than σ2 (current value) at the point P2, that is, the rotation speed fr1, fr4, or fr5 at the points P1, P4 or P5 is acquired as the target rotation speed. To do.

In this way, in step S220, if the rotation speed fr whose characteristic value σ is smaller than the current value is acquired as the target rotation speed based on the characteristic diagram, rolling is performed so as to reach the target rotation speed in step S224. By operating the apparatus 2, the growth rate of N-polygonization of the rolling roll 3 can be made smaller than the current value (that is, the growth of N-polygonization can be slowed down), whereby the growth of N-polygonization can be slowed down. The growth of N-polygonization can be suppressed.

In some embodiments, the characteristic value σ is the rolling roll 3 at a frequency corresponding to the N-polygon during rolling at the rolling speed fr of the rolling roll 3, for example, as defined by the above equation (E). It is an index of the rate of change of the amplitude of vibration. Then, in step S220 (target rotation speed acquisition step) described above, the target rotation speed fr at which the characteristic value σ is less than zero is set based on the correlation between the rotation speed fr of the rolling roll 3 and the characteristic value σ. Get as a number.

For example, assuming that the operating condition at point P2 (rolling roll rotation speed fr2) was obtained at the time when the target rotation speed was calculated in step S220 (before the rotation speed of the rolling roll 3 was changed), the characteristic value σ in step S220. The rotation speed fr at which is less than zero, that is, for example, the rotation speed fr1 or fr5 at the point P1 or P5 is acquired as the target rotation speed.

As described above, in step S220, if the rotation speed fr at which the characteristic value σ is less than zero is acquired as the target rotation speed based on the characteristic diagram, the rolling apparatus 2 is set to the target rotation speed in step S224. By operating the above, the N-polygonization of the rolling roll 3 can be attenuated, and thereby the growth of the N-polygonization of the rolling roll 3 can be suppressed.

In some embodiments, in step S220 (target rotation speed acquisition step), if there is a rotation speed range of 2 or more corresponding to the characteristic value σ indicating that the N-gonification of the rolling roll 3 is slowed or attenuated. The rotation speed within the larger rotation speed range of the two or more rotation speed ranges is acquired as the target rotation speed.

In the characteristic diagram of FIG. 6, the range of Φ in which the characteristic value σ is less than 0 is Φ <α1 or Φ> α2. In other words, the range of the rotation speed fr at which the characteristic value σ is less than 0 is fr <α1 × fn / N or fr> α2 × fn / N. Therefore, in this characteristic diagram, there are two rotation speed ranges (that is, fr <α1 × fn / N and fr> α2 × fn) corresponding to the characteristic value σ indicating that the N-gonification of the rolling roll 3 is attenuated. / N) Exists. Therefore, in the above-described embodiment, in step S220 (target rotation speed acquisition step), the larger rotation speed of the above two rotation speed ranges is set as the target rotation speed for attenuating the N-gonification of the rolling roll 3. A target rotation speed within a number range (that is, fr> α2 × fn / N) is set.

In the above-described embodiment, when there are two or more rotation speed ranges corresponding to the characteristic value σ indicating that the N-gonification of the rolling roll 3 is slowed or attenuated, the rotation within the larger rotation speed range of these. Get the number as the target rotation speed. Therefore, by operating the rolling apparatus 2 so as to reach the target rotation speed acquired in this way, the rolling roll is formed into an N-gon shape while suppressing a decrease in the rotation speed of the rolling roll 3 and maintaining the line speed as high as possible. Can suppress the growth of. That is, since the line speed can be made as high as possible, the production efficiency of the product can be improved while suppressing the deterioration of the quality of the product (metal plate).

In some embodiments, in step S220 (target rotation speed acquisition step), when the natural frequency of the rolling roll 3 is fn, the rotation speed within the rotation speed range larger than fn / N is set as the target rotation speed. get. In the characteristic diagram shown in FIG. 6, since the rotation speed fr at Φ = α2 (≈1) is substantially equal to fn / N, the rotation speed fr5 at the point P5 is a rotation speed range larger than fn / N. The number of revolutions in.

According to the findings of the present inventors, for example, as shown in FIG. 6, the frequency of vibration (fr × N) corresponding to the N-side shape of the rolling roll 3 at the rotation speed fr of the rolling roll 3 is that of the rolling roll 3. Even in the high rotation speed region where the natural frequency fn is larger, there is a rotation speed range in which the characteristic value σ becomes relatively small (that is, the N-squared formation of the rolling roll is slowed or attenuated). In this regard, in the above-described embodiment, a relatively large rotation speed within the rotation speed range larger than fn / N is acquired as the target rotation speed. Therefore, by operating the rolling apparatus 2 so as to reach the target rotation speed acquired in this way, the N-sided shape of the rolling roll 3 is suppressed while the decrease in the rotation speed of the rolling roll 3 is suppressed and the line speed is maintained as high as possible. It is possible to suppress the growth of rolling stock.

FIG. 7 is a chart showing the history of the evaluation coefficient Ψ when the rolling apparatus 2 is operated based on the operation support method according to the flowchart of FIG. In the example shown in FIG. 7, the history of the evaluation coefficient Ψ for 39-sided, 40-sided, and 41-sided of the various N-sided shapes in the rolling roll 3 is shown in a line graph. The time ct in the graph of FIG. 7 is the time when the latest vibration data was acquired. According to the graph of FIG. 7, since the increase and decrease of the evaluation coefficient Ψ for each polygonization are switched at time t10, t11 and t12, the rotation speed of the rolling roll 3 is determined at these timings. You can see that it has changed.

According to the driving support method shown in the flowchart of FIG. 3, as shown in FIG. 7, the evaluation coefficient Ψ of the N-sided polygon (here, 39-sided polygon, 40-sided polygon, and 41-sided polygon) of interest should not exceed 0 as much as possible. In addition, the rotation speed of the rolling roll 3 is adjusted (in particular, see steps S216 to S222). Then, from the current trend of the evaluation coefficient Ψ shown in FIG. 7, the evaluation coefficient Ψ at a future time point is predicted and displayed on the display unit 98, or a guideline for the timing of changing the rotation speed (that is, the line speed) of the rolling roll 3. It can be used for controlling the rotation speed (that is, line speed) of the rolling roll 3.

FIG. 8 is an example of a characteristic diagram showing the correlation between the rotation speed fr of the rolling roll 3 and the characteristic value σ, and the 39, 40, 41 squares at the rotation speed fr at the time tk shown in the chart of FIG. It is a figure which shows the value of σ of. FIG. 9 is a diagram showing the state of the vibration amplitude corresponding to the 39, 40, 41 squares of the rolling roll 3 at the time tc shown in the chart of FIG. 7. FIG. 10A is a diagram showing the state of the characteristic value σ corresponding to the 39, 40, 41 squares of the rolling roll 3 at the time tc shown in the chart of FIG. 7. FIG. 10B is a diagram showing the state of the evaluation coefficient Ψ corresponding to the 39, 40, 41 squares of the rolling roll 3 at the time tc shown in the chart of FIG. 7.

From FIGS. 8 and 10A, at time tc, the characteristic value σ for the 40-sided polygon is larger than zero. From this, it can be seen that 40-sided formation is growing on the rolling roll 3. Further, at the time tc, the characteristic value σ for the 39-sided square and the 41-sided square is smaller than zero. From this, it can be seen that the 39-sided and 41-sided squares are attenuated in the rolling roll 3. Further, from FIG. 9, at time tc, to the extent the vibration amplitude corresponding to 39, 40, 41 square are both smaller than the management value _{A M,} the influence on the quality of the metal plate S to be rolled out 39, It can be seen that the 40 and 41 squares have not grown. Further, from FIG. 10B, the evaluation coefficient Φ corresponding to the 39, 40, 41 squares is maintained at less than 0 at the time tc, and the vibration amplitude corresponding to the 39, 40, 41 squares is maintained as compared with the past reference time. It can be seen that is not growing excessively.

In some embodiments, during rolling of the rolling roll 3 at the rotation speed fr1, vibration data indicating the vibration of the rolling roll 3 is acquired, frequency analysis is performed on the vibration data, and the frequency spectrum of the vibration data is acquired. To do. Then, based on the frequency spectrum, the vibration amplitude A1 at the frequency corresponding to the N-sided polygon is acquired. Further, based on the characteristic value σ and the vibration amplitude A1, when continued rolling in the rotational speed fr1, it calculates the time Δtb until the vibration amplitude reaches the threshold A _th. Then, the time calculated in this way is output to, for example, the display unit 98 via the output unit 72. Incidentally, the threshold value A _th, the aforementioned management value A _{M (i.e.,} the management value A _M used in the roll rotation speed control for suppressing the N square of the rolling rolls ₃₎ may be the same value.

An example of the calculation method of the time Δtb will be described. From the formula (A), the characteristic value σ indicates the change in amplitude during the time Δt during rolling at the rotation speed fr _i of the rolling roll 3 as a ratio (A _{i_t2} / A _{i_t1} ). Therefore, from equation (A), a characteristic value σ during rolling in rotational speed fr1, the vibration amplitude A corresponding to the N rectangular at some point during the rolling in the rotational speed fr1, the threshold A _th vibration amplitude _(although a _{<a th),} and the vibration amplitude using time Δtb from a until the _{a th,} can be expressed as the following equation (E).
σ = ln (A _th / A1) / (fr1 · Δtb)… (E)
The following formula (F) can be obtained by modifying the above formula (E).
Δtb = ln ( _Th / A1) / (σ ・ fr1)… (F)
Therefore, from the above equation (F), during rolling in rotational speed fr1, from time a vibration amplitude A1 corresponding to the N polygon t1 (e.g. the current time), the time until the vibration amplitude becomes the threshold value A _th The length Δtb can be calculated (predicted).

In the above-described embodiment, the rotation speed fr1 of the rolling roll 3 is based on the above-mentioned correlation (correlation indicating the growth tendency of N-polygonization of the rolling roll) between the rotation speed fr of the rolling roll 3 and the characteristic value σ. If you continue rolling from time t1, and calculates the time Δtb to vibration amplitude corresponding to the N square of the rolling rolls 3 reaches a predetermined threshold value a _th (prediction). That is, since the time until the N-sided polygonization of the rolling roll 3 reaches a predetermined degree (threshold _Ath ) is calculated and displayed, for example, the operating conditions (rolling) before the calculated time elapses. By changing (roll rotation speed, etc.) or replacing the rolling roll 3, it is possible to prevent the degree of N-polygonization of the rolling roll 3 from becoming too large. As a result, deterioration of the quality of the product metal plate after rolling can be suppressed.

In some embodiments, the rolling roll 3 whose N-sided shape is formed by surface processing by a processing machine is installed in the rolling apparatus 2. Then, in step S220 (target rotation speed acquisition step) described above, the correlation between the rotation speed of the rolling roll 3 and the characteristic value σ is such that the growth of N-polygonization generated in the rolling roll 3 due to surface processing is slowed or attenuated. The target rotation speed (rotation speed fr) is acquired based on the relationship.

Normally, the rolling roll 3 is surface-processed by a processing machine (for example, a grinding machine or the like) so that the cross-sectional shape becomes circular before use, but in reality, this surface processing makes the rolling roll 3 into an N-gonal shape that cannot be visually recognized. May occur. In this regard, according to the above-described embodiment, the target rotation speed of the rolling roll 3 is obtained so that the growth of the N-sided polygonation generated in the rolling roll 3 due to the surface processing by the processing machine is slowed down or attenuated. Therefore, when the rolling roll 3 whose N-side shape is formed by surface processing is installed in the rolling apparatus 2 and the rolling is performed, the N-sided shape of the rolling roll 3 is formed by operating the rolling apparatus 2 at the above-mentioned target rotation speed. Rolling can be slowed (delayed) or dampened. As a result, it is possible to suppress the growth of N-polygonization of the rolling roll 3 and suppress the deterioration of the quality of the rolled product (metal plate S).

Examples of surface processing of the rolling roll 3 include grinding processing using a grindstone or cutting processing using a tool or an end mill. In addition, grinding may be performed after cutting.

The outline of the rolling equipment operation support method, the operation support device, and the rolling equipment according to some embodiments will be described below.

(1) The method for supporting the operation of rolling equipment according to at least one embodiment of the present invention is
Based on the correlation between the rotation speed fr of the rolling roll and the characteristic value σ showing the growth tendency of N-polygonization in which the rolling roll is unevenly worn and becomes N-gonal when rolling is performed at the rotation speed fr. , A target rotation speed acquisition step for acquiring the rotation speed fr corresponding to the characteristic value σ indicating that the N-squared formation of the rolling roll is slowed or attenuated.
A step of outputting the acquired rotation speed fr as a target rotation speed, and
To be equipped.

According to the method (1) above, it corresponds to the characteristic value σ indicating that the N-squared formation of the rolling roll is slowed or attenuated based on the correlation between the rotation speed fr of the rolling roll and the above-mentioned characteristic value σ. The rotation speed fr is acquired, and the rotation speed fr is output as the target rotation speed. Therefore, by operating the rolling apparatus to roll the material (metal plate, etc.) so that the rotation speed of the rolling roll becomes the output target rotation speed, the N-sided formation of the rolling roll is slowed down (delayed) or It can be attenuated. As a result, it is possible to suppress the growth of N-polygonization of the rolling roll and suppress the deterioration of the quality of the rolled product (metal plate, etc.).

(2) In some embodiments, in the method of (1) above,
The characteristic value σ is an index of a tendency of a time-dependent change in the amplitude of the vibration frequency of the rolling roll corresponding to the N-sided polygon during rolling at the rotation speed fr of the rolling roll.

According to the method (2) above, the above-mentioned characteristic value σ is an index of the tendency of the time-dependent change of the amplitude of the vibration frequency of the rolling roll corresponding to the N-polygon during rolling at the rotation speed fr of the rolling roll. is there. Therefore, based on the correlation between this characteristic value σ and the rotation speed fr of the rolling roll, the rotation speed fr corresponding to the characteristic value σ indicating that the N-polygonization of the rolling roll is slowed or attenuated should be appropriately acquired. Can be done. Therefore, by operating the rolling apparatus based on the target rotation speed acquired in this way to roll the material (metal plate, etc.), the N-gonification of the rolling roll is effectively slowed (delayed) or attenuated. be able to.

(3) In some embodiments, in the method (2) above,
The characteristic value σ is an index of the change rate of the amplitude of the vibration of the rolling roll at the frequency corresponding to the N-sided polygon during rolling at the rotation speed fr of the rolling roll.
In the target rotation speed acquisition step, the rotation speed fr at which the characteristic value σ is smaller than the current value is set to the target rotation speed based on the correlation between the rotation speed fr of the rolling roll and the characteristic value σ. To get as.

According to the method (3) above, based on the above correlation, the characteristic value σ indicating the rate of change of the amplitude of the frequency component (vibration) corresponding to the N-sided polygon among the vibrations of the rolling roll is larger than the current value. The smaller rotation speed fr is acquired as the target rotation speed. Therefore, by operating the rolling apparatus so as to reach the target rotation speed acquired in this way, the growth rate of N-polygonization of the rolling roll can be made smaller than the current value, thereby forming the N-polygonization of the rolling roll. Can suppress the growth of.

(4) In some embodiments, in the method (2) or (3) above,
The characteristic value σ is an index of the change rate of the amplitude of the vibration of the rolling roll at the frequency corresponding to the N-sided polygon during rolling at the rotation speed fr of the rolling roll.
In the target rotation speed acquisition step, the rotation speed fr at which the characteristic value σ is less than zero is acquired as the target rotation speed based on the correlation between the rotation speed fr of the rolling roll and the characteristic value σ. ..

According to the method (4) above, the characteristic value σ indicating the rate of change of the amplitude of the frequency component (vibration) corresponding to the N-gon is less than zero in the vibration of the rolling roll based on the above correlation. The rotation speed fr is acquired as the target rotation speed. Therefore, by operating the rolling apparatus so as to reach the target rotation speed acquired in this way, the N-polygonization of the rolling roll can be attenuated, and thereby the growth of the N-polygonization of the rolling roll can be suppressed. it can.

(5) In some embodiments, in any of the above methods (1) to (4),
In the target rotation speed acquisition step, when there is a rotation speed range of 2 or more corresponding to the characteristic value σ indicating that the N-sided polygonization of the rolling roll is slowed or attenuated, the rotation speed range of the 2 or more The rotation speed within the larger rotation speed range is acquired as the target rotation speed.

According to the method (5) above, when there is a rotation speed range of 2 or more corresponding to the characteristic value σ indicating that the N-gonification of the rolling roll is slowed or attenuated, the larger rotation speed range of these is present. The number of rotations inside is acquired as the target number of rotations. Therefore, by operating the rolling apparatus so as to reach the target rotation speed acquired in this way, the growth of N-polygonization of the rolling roll is performed while suppressing the decrease in the rotation speed of the rolling roll and maintaining the line speed as high as possible. Can be suppressed.

(6) In some embodiments, in any of the above methods (1) to (5),
In the target rotation speed acquisition step, when the natural frequency of the rolling roll is fn, the rotation speed within the rotation speed range larger than fn / N is acquired as the target rotation speed.

According to the findings of the present inventors, the frequency of vibration (fr × N) corresponding to the N-side of the rolling roll at the rolling roll rotation speed fr is higher than the natural frequency fn of the rolling roll. Even in a few regions, there is a rotation speed range in which the characteristic value σ becomes relatively small (that is, the N-square formation of the rolling roll is slowed or attenuated). In this regard, according to the method (6) above, a relatively large rotation speed within the rotation speed range larger than fn / N is acquired as the target rotation speed. Therefore, by operating the rolling apparatus so as to reach the target rotation speed acquired in this way, the growth of N-polygonization of the rolling roll is performed while suppressing the decrease in the rotation speed of the rolling roll and maintaining the line speed as high as possible. Can be suppressed.

(7) In some embodiments, in any of the methods (1) to (6) above,
A step of acquiring vibration data indicating the vibration of the rolling roll during rolling at the rotation speed fr1 of the rolling roll, and
A step of performing frequency analysis on the vibration data and acquiring a frequency spectrum of the vibration data,
A step of acquiring the amplitude A1 of the vibration at the frequency corresponding to the N-side polygon based on the frequency spectrum, and
A step of calculating the time until the amplitude of the vibration reaches the threshold value when rolling at the rotation speed fr1 is continued based on the characteristic value σ and the amplitude A1 of the vibration.
The step to output the time and
To be equipped.

According to the method (7) above, the time until the amplitude of the vibration corresponding to the N-sided polygon reaches the threshold value is calculated when rolling at the rotation speed fr1 is continued. Therefore, by changing the rotation speed of the rolling roll to the above-mentioned target rotation speed before this time elapses, the N-gonification of the rolling roll can be performed before the growth of the N-polygonization of the rolling roll progresses too much. It can be blunted (delayed) or attenuated. As a result, it is possible to appropriately suppress the growth of N-polygonization of the rolling roll and suppress the deterioration of the quality of the rolled product (metal plate, etc.).

(8) In some embodiments, in any of the methods (1) to (7) above,
During rolling at the rotation speed fr1 of the rolling roll, a step of acquiring vibration data indicating the vibration of the rolling roll for each sampling period, and
A step of performing frequency analysis on each of the vibration data and acquiring a frequency spectrum of the vibration data,
For each of the vibration data, a step of acquiring the amplitude of the vibration at the frequency corresponding to the N-side polygon based on the frequency spectrum, and
When the amplitude of the vibration exceeds the threshold value, the step of changing the rotation speed fr1 to the target rotation speed, and
To be equipped.

According to the method (8) above, based on the vibration data of the rolling roll acquired during rolling at the rotation speed fr1, the amplitude of the vibration at the frequency corresponding to the N-side of the rolling roll is acquired, and the amplitude is the threshold value. When the above value is exceeded, the rotation speed of the rolling roll is changed to the above-mentioned target rotation speed. Therefore, the N-polygonization of the rolling roll can be slowed (delayed) or attenuated before the growth of the N-polygonization of the rolling roll progresses too much. As a result, it is possible to appropriately suppress the growth of N-polygonization of the rolling roll and suppress the deterioration of the quality of the rolled product (metal plate, etc.).

(9) In some embodiments, in any of the methods (1) to (8) above,
It is equipped with a step of installing a rolling roll whose N-sided shape is generated by surface processing by a processing machine in a rolling apparatus.
In the target rotation speed acquisition step, the rotation speed fr is acquired based on the correlation so that the growth of the N-sided polygonation caused by the surface processing is slowed down or attenuated.

Normally, the rolling roll is surface-processed by a processing machine (for example, a grinding machine) so that the cross-sectional shape becomes circular before use, but in reality, this surface processing results in N-sided polygonation that cannot be visually recognized. May occur. In this regard, according to the method (9) above, the target rotation speed of the rolling roll is obtained so that the growth of N-polygonization generated by the surface processing by the processing machine is slowed or attenuated. Therefore, when a rolling roll in which N-gonification is generated by surface processing is installed in a rolling apparatus and rolling is performed, the N-gonification of the rolling roll is slowed down by operating the rolling apparatus at the above-mentioned target rotation speed ( Can be delayed) or attenuated. As a result, it is possible to suppress the growth of N-polygonization of the rolling roll and suppress the deterioration of the quality of the rolled product (metal plate, etc.).

(10) The operation support device for rolling equipment according to at least one embodiment of the present invention is
An operation support device for rolling equipment that includes rolling rolls for rolling metal plates.
The rolling roll is based on the correlation between the rotation speed fr of the rolling roll and the characteristic value σ indicating the growth tendency of N-square formation due to uneven wear of the rolling roll when rolling is performed at the rotation speed fr. A target rotation speed acquisition unit configured to acquire the rotation speed fr corresponding to the characteristic value σ indicating that the N-squared formation is slowed or attenuated.
An output unit configured to output the acquired rotation speed fr as a target rotation speed, and
To be equipped.

According to the configuration of (10) above, it corresponds to the characteristic value σ indicating that the N-sided formation of the rolling roll is slowed or attenuated based on the correlation between the rotation speed fr of the rolling roll and the above-mentioned characteristic value σ. The rotation speed fr is acquired, and the rotation speed fr is output as the target rotation speed. Therefore, by operating the rolling apparatus to roll the material (metal plate, etc.) so that the rotation speed of the rolling roll becomes the output target rotation speed, the N-sided formation of the rolling roll is slowed down (delayed) or It can be attenuated. As a result, it is possible to suppress the growth of N-polygonization of the rolling roll and suppress the deterioration of the quality of the rolled product (metal plate, etc.).

(11) The rolling equipment according to at least one embodiment of the present invention is
A rolling apparatus including a rolling roll for rolling a metal plate,
The driving support device according to (10) above,
To be equipped.

According to the configuration of (11) above, it corresponds to the characteristic value σ indicating that the N-sided formation of the rolling roll is slowed or attenuated based on the correlation between the rotation speed fr of the rolling roll and the above-mentioned characteristic value σ. The rotation speed fr is acquired, and the rotation speed fr is output as the target rotation speed. Therefore, by operating the rolling apparatus to roll the material (metal plate, etc.) so that the rotation speed of the rolling roll becomes the output target rotation speed, the N-sided formation of the rolling roll is slowed down (delayed) or It can be attenuated. As a result, it is possible to suppress the growth of N-polygonization of the rolling roll and suppress the deterioration of the quality of the rolled product (metal plate, etc.).

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and includes a modified form of the above-described embodiments and a combination of these embodiments as appropriate.

In the present specification, expressions representing relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial". Strictly represents not only such an arrangement, but also a tolerance or a state of relative displacement at an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "same", "equal", and "homogeneous" that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the state of existence.
Further, in the present specification, the expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also within a range in which the same effect can be obtained. , The shape including the uneven portion, the chamfered portion, etc. shall also be represented.
Further, in the present specification, the expression "comprising", "including", or "having" one component is not an exclusive expression excluding the existence of another component.

1 Rolling equipment 2 Rolling equipment 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 Rolling device 10 Rolling stand 10A Rolling stand 10B Rolling stand 10C Rolling stand 50 Operation support device 52 Vibration Data acquisition unit 54 Frequency analysis unit 56 Vibration extraction unit 59 Vibration comparison unit 60 Recording unit 63 Target rotation speed acquisition unit 67 Evaluation coefficient calculation unit 69 Evaluation coefficient comparison unit 72 Output unit 90 Vibration measurement unit 91 Accelerometer 92 Accelerometer 92 Accelerometer 93 Accelerometer 94 Accelerometer 95 Roll rotation speed measurement unit 96 Storage unit 98 Display unit 99 Rotation speed control unit S Metal plate

Claims (11)

1. Based on the correlation between the rotation speed fr of the rolling roll and the characteristic value σ showing the growth tendency of N-polygonization in which the rolling roll is unevenly worn and becomes N-gonal when rolling is performed at the rotation speed fr. , A target rotation speed acquisition step for acquiring the rotation speed fr corresponding to the characteristic value σ indicating that the N-squared formation of the rolling roll is slowed or attenuated.
   A step of outputting the acquired rotation speed fr as a target rotation speed, and
   A method of supporting the operation of rolling equipment provided with.
2. The characteristic value σ is the index of the tendency of the vibration amplitude of the rolling roll to change with time at a frequency corresponding to the N-sided polygon during rolling at the rotation speed fr of the rolling roll, according to claim 1. Operation support method for rolling equipment.
3. The characteristic value σ is an index of the change rate of the amplitude of the vibration of the rolling roll at the frequency corresponding to the N-sided polygon during rolling at the rotation speed fr of the rolling roll.
   In the target rotation speed acquisition step, the rotation speed fr at which the characteristic value σ is smaller than the current value is set to the target rotation speed based on the correlation between the rotation speed fr of the rolling roll and the characteristic value σ. The operation support method for rolling equipment according to claim 2, which is acquired as.
4. The characteristic value σ is an index of the change rate of the amplitude of the vibration of the rolling roll at the frequency corresponding to the N-sided polygon during rolling at the rotation speed fr of the rolling roll.
   In the target rotation speed acquisition step, the rotation speed fr at which the characteristic value σ is less than zero is acquired as the target rotation speed based on the correlation between the rotation speed fr of the rolling roll and the characteristic value σ. The operation support method for rolling equipment according to claim 2 or 3.
5. In the target rotation speed acquisition step, when there is a rotation speed range of 2 or more corresponding to the characteristic value σ indicating that the N-gonification of the rolling roll is slowed or attenuated, the rotation speed range of the 2 or more The operation support method for rolling equipment according to any one of claims 1 to 4, wherein the rotation speed within the larger rotation speed range is acquired as the target rotation speed.
6. In any of claims 1 to 5, in the target rotation speed acquisition step, when the natural frequency of the rolling roll is fn, the rotation speed within the rotation speed range larger than fn / N is acquired as the target rotation speed. The operation support method for rolling equipment described in item 1.
7. A step of acquiring vibration data indicating the vibration of the rolling roll during rolling at the rotation speed fr1 of the rolling roll, and
   A step of performing frequency analysis on the vibration data and acquiring a frequency spectrum of the vibration data,
   A step of acquiring the amplitude A1 of the vibration at the frequency corresponding to the N-side polygon based on the frequency spectrum, and
   A step of calculating the time until the amplitude of the vibration reaches the threshold value when rolling at the rotation speed fr1 is continued based on the characteristic value σ and the amplitude A1 of the vibration.
   The step to output the time and
   The operation support method for rolling equipment according to any one of claims 1 to 6.
8. During rolling at the rotation speed fr1 of the rolling roll, a step of acquiring vibration data indicating the vibration of the rolling roll for each sampling period, and
   A step of performing frequency analysis on each of the vibration data and acquiring a frequency spectrum of the vibration data,
   For each of the vibration data, a step of acquiring the amplitude of the vibration at the frequency corresponding to the N-side polygon based on the frequency spectrum, and
   When the amplitude of the vibration exceeds the threshold value, the step of changing the rotation speed fr1 to the target rotation speed, and
   The operation support method for rolling equipment according to any one of claims 1 to 7.
9. It is equipped with a step of installing a rolling roll whose N-sided shape is generated by surface processing by a processing machine in a rolling apparatus.
   In the target rotation speed acquisition step, any one of claims 1 to 8 for acquiring the rotation speed fr based on the correlation so that the growth of the N-sided polygonation caused by the surface processing is slowed down or attenuated. The operation support method for the rolling equipment described in the section.
10. An operation support device for rolling equipment that includes rolling rolls for rolling metal plates.
    The rolling roll is based on the correlation between the rotation speed fr of the rolling roll and the characteristic value σ indicating the growth tendency of N-square formation due to uneven wear of the rolling roll when rolling is performed at the rotation speed fr. A target rotation speed acquisition unit configured to acquire the rotation speed fr corresponding to the characteristic value σ indicating that the N-squared formation is slowed or attenuated.
    An output unit configured to output the acquired rotation speed fr as a target rotation speed, and
    An operation support device for rolling equipment equipped with.
11. A rolling apparatus including a rolling roll for rolling a metal plate,
    The driving support device according to claim 10 and
    Rolling equipment equipped with.

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