WO2021024447A1 - Procédé d'évaluation d'état et dispositif d'évaluation d'état de dispositif de laminage, et équipement de laminage - Google Patents

Procédé d'évaluation d'état et dispositif d'évaluation d'état de dispositif de laminage, et équipement de laminage Download PDF

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Publication number
WO2021024447A1
WO2021024447A1 PCT/JP2019/031332 JP2019031332W WO2021024447A1 WO 2021024447 A1 WO2021024447 A1 WO 2021024447A1 JP 2019031332 W JP2019031332 W JP 2019031332W WO 2021024447 A1 WO2021024447 A1 WO 2021024447A1
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Prior art keywords
rolling
rolling roll
vibration
rotation speed
amplitude
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PCT/JP2019/031332
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English (en)
Japanese (ja)
Inventor
石川　英司
喜美 影平
宏徳 下釜
吉川　雅司
Original Assignee
Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社
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Application filed by Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社 filed Critical Ｐｒｉｍｅｔａｌｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｊａｐａｎ株式会社
Priority to CN201980097273.3A priority Critical patent/CN114007774B/zh
Priority to PCT/JP2019/031332 priority patent/WO2021024447A1/fr
Priority to JP2021538643A priority patent/JP7179996B2/ja
Publication of WO2021024447A1 publication Critical patent/WO2021024447A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/46—Roll speed or drive motor control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups

Definitions

  • the present disclosure relates to a state evaluation method of a rolling apparatus, a state evaluation device, and a rolling equipment.
  • the occurrence of defects in the rolled product may be detected or suppressed based on the measurement result of vibration of the rolling apparatus.
  • 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 defect that occurs in a metal plate to be rolled. It is described to detect the resonance phenomenon (chattering) of the rolling mill that may cause (chatter mark).
  • N-sided formation may occur in which the cross-sectional shape of the rolling roll approaches a specific N-sided shape.
  • 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 appropriately grasp the growth tendency of N-sided rolling rolls and suppress the deterioration of product quality.
  • At least one embodiment of the present invention aims to provide a state evaluation method, a state evaluation device, and a rolling equipment of a rolling apparatus capable of appropriately evaluating the growth tendency of N-polygonization of a rolling roll. And.
  • the method for evaluating the state of the rolling mill is It is a method for evaluating the growth tendency of N-polygonization in which the rolling roll of the rolling apparatus is unevenly worn to become N-gonal.
  • a vibration data acquisition step of acquiring vibration data indicating the vibration of the rolling roll in each of a plurality of sampling periods, and a vibration data acquisition step.
  • An amplitude acquisition step of performing frequency analysis on each of the vibration data acquired during the plurality of sampling periods and acquiring the amplitude of the vibration at the frequency corresponding to the N-gon.
  • an evaluation step for evaluating the growth tendency of the N-polygonization of the rolling roll during rolling at the rotation speed fr Based on the time course of the amplitude acquired for each of the vibration data, an evaluation step for evaluating the growth tendency of the N-polygonization of the rolling roll during rolling at the rotation speed fr, and an evaluation step.
  • a state evaluation method for evaluating the growth tendency of N-polygonization of a rolling roll.
  • FIG. 5A It is a schematic diagram of an example of the frequency spectrum obtained by frequency analysis of the vibration data of the rolling roll acquired in the sampling period after the lapse of time ⁇ t from the sampling period of the vibration data shown in FIG. 5A. It is a figure which shows a typical example of the correlation (characteristic diagram) of the rotation speed fr of a rolling roll and a characteristic value ⁇ . It is a schematic diagram of the rolling apparatus in which N-sided formation of a rolling roll occurs. It is a figure which shows an example of the evaluation result displayed on the display part.
  • FIG. 1 is a schematic view of a rolling equipment to which a state evaluation method and a state evaluation device according to some embodiments are applied.
  • 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 a state evaluation for evaluating the state of the rolling apparatus 2.
  • the device 50 and the like are provided.
  • 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.
  • 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).
  • 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 signal indicating the above-mentioned vibration detected by the acceleration sensors 91 to 94 is sent to the state evaluation device 50.
  • the vibration measuring unit 90 may include a displacement detecting unit configured to measure the displacement of the rolling roll 3 in any direction.
  • the vibration of the rolling roll 3 may be calculated based on the measurement result by the displacement detection unit.
  • the displacement detection unit for example, a displacement meter of a laser type or an eddy current type can be used.
  • an imaging device (camera or the like) can be used as the displacement detection unit.
  • 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 state evaluation device 50 according to the embodiment.
  • the state evaluation device 50 is configured to evaluate the growth tendency of N-polygonization due to uneven wear of the rolling roll 3, as will be described in detail later.
  • the state evaluation 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 state evaluation device 50 is configured to acquire the steel type data (material, hardness, etc.) of the metal plate S rolled by the rolling device 2 from the steel type data storage unit 96.
  • the state evaluation device 50 includes a vibration data acquisition unit 52 for processing received information, a frequency analysis unit 54, an amplitude extraction unit 56, a characteristic value calculation unit 62, a correlation acquisition unit 66, an evaluation unit 68, and the like. .. Further, the state evaluation device 50 includes an output unit 72 configured to output the evaluation result by the state evaluation device 50. The evaluation result by the state evaluation device 50 is output to the display unit 98 (display or the like) via the output unit 72.
  • the state evaluation device 50 may include a CPU, a memory (RAM), an auxiliary storage unit, an interface, and the like.
  • the state evaluation device 50 receives signals from various measuring instruments (such as the vibration measuring unit 90 or the roll rotation speed measuring unit 95 described above) 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 state evaluation 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.
  • FIG. 7 is a schematic view of a rolling apparatus in which the rolling roll 3 is N-sided.
  • the rolling apparatus 2 shown in FIG. 7 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.
  • the rolling roll 3 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. Therefore, it is desired to appropriately grasp the growth tendency of the N-gonalization of the rolling roll 3 and suppress the deterioration of the quality of the product metal plate. According to the state evaluation method of the rolling apparatus described below, the growth tendency of N-polygonization of the rolling roll 3 can be appropriately grasped.
  • 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.
  • N-sided formation may occur on a specific rolling roll 3 (work rolls 4A, 4B or backup rolls 6A, 6B).
  • N-polygonization is relatively likely to occur in the work rolls 4A and 4B.
  • cold rolling performed at a relatively low temperature N-polygonization is relatively likely to occur in the backup rolls 6A and 6B.
  • the state evaluation method of the rolling mill will be described.
  • the growth tendency of N-polygonization of the rolling roll 3 (work roll 4A, 4B or backup roll 6A, 6B) can be evaluated.
  • a method of evaluating the state of the rolling mill using the above-mentioned state evaluation device 50 will be described, but in some embodiments, a part or all of the processing by the state evaluation device 50 described below will be described.
  • the state of the rolling mill may be evaluated by manually performing the above.
  • FIG. 3 is a schematic flowchart of a state evaluation method of the rolling mill according to the embodiment.
  • the vibration data acquisition unit 52 acquires vibration data indicating the vibration of the rolling roll 3 in a plurality of sampling periods during rolling of the rolling roll 3 at a specific rotation speed fr (vibration data acquisition).
  • fr vibration data acquisition
  • Step S102 the vibration data
  • the one measured by the vibration measuring unit 90 described above may be acquired online.
  • the vibration data measured by the vibration measuring unit 90 in the past and stored in the storage device may be acquired by reading the vibration data from the storage device.
  • the frequency analysis unit 54 performs frequency analysis on each of the vibration data acquired during the plurality of sampling periods (step S104). Further, based on the frequency spectrum obtained as a result of frequency analysis by the amplitude extraction unit 56, the vibration amplitude A at the frequency (fr ⁇ N) corresponding to the specific N-side (hereinafter, the vibration amplitude A corresponding to the N-side) and the like. (Also referred to as) is acquired (amplitude acquisition step; step S106).
  • step S112 based on the time-dependent change of the vibration amplitude A acquired for each of the vibration data in step S106 by the evaluation unit 68, the growth of N-polygonization of the rolling roll 3 during rolling at the rotation speed fr of the rolling roll 3 The tendency is evaluated (evaluation step; step S112).
  • the characteristic value calculation unit 62 may calculate the characteristic value ⁇ indicating the index of the change with time of the vibration amplitude A based on the vibration amplitude A or the like acquired in step S106 (characteristic value acquisition). Step; Step S108). In this case, in step S112, the growth tendency of N-polygonization of the rolling roll 3 at the time of rolling at the rotation speed fr of the rolling roll 3 may be evaluated based on the characteristic value ⁇ calculated in step S108. ..
  • the correlation acquisition unit 66 performs the above steps S102 to S108 at a plurality of rotation speed frs of the rolling roll 3 to acquire characteristic values ⁇ corresponding to the plurality of rotation speed frs, respectively. Then, a characteristic diagram showing the correlation between the rotation speed fr of the rolling roll 3 and the characteristic value ⁇ may be acquired (correlation acquisition step; step S110). In this case, in step S112, based on the characteristic diagram (correlation) acquired in step S110, the growth tendency of N-polygonization of the rolling roll 3 at the time of rolling at the rotation speed fr of the rolling roll 3 is evaluated. You may.
  • step S108 and step S110 in the flowchart of FIG. 3 are arbitrary steps that can be executed as needed.
  • step S102 during rolling of the rolling roll 3 at a specific rotation speed fr, vibration data indicating the vibration of the rolling roll 3 is acquired in each of the plurality of sampling periods.
  • FIG. 4A is a graph schematically showing an example of the time-dependent change of the vibration amplitude A (corresponding to the vibration amplitude acquired in step S106) corresponding to the specific N-sided polygon in the rolling roll 3.
  • FIG. 4B is a graph schematically showing an example of the relationship between the time t and the rotation speed fr of the rolling roll 3.
  • the time axis (horizontal axis) of the graph of FIG. 4A and the graph of FIG. 4B is common.
  • the tendency (increase or decrease, speed, etc.) of the vibration amplitude A corresponding to a specific N-sided polygon with time differs depending on the rotation speed fr of the rolling roll 3.
  • rolling is performed at the rotation speed fr1 of the rolling roll 3 during the period from time t0 to time t1 (length ⁇ t1 of the period) (see FIG. 4B).
  • the vibration amplitude A corresponding to the specific N-sided polygon shows an increasing tendency (see FIG. 4A).
  • 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.
  • the rotation speed fr1 of the rolling roll 3 is changed to fr2 (however, fr1 ⁇ fr2), and the period from time t1 to time t2 (length ⁇ t2 of the period) is the rotation speed fr2 of the rolling roll 3. (See Fig. 4B).
  • the vibration amplitude A corresponding to the specific N-sided polygon shows a decreasing tendency (see FIG. 4A). 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.
  • step S102 vibration data is acquired in a sampling period including the time t0 during rolling at the rotation speed fr1 of the rolling roll 3 and a sampling period including the time t1 (however, t0 ⁇ t1) (FIGS. 4A and 4A). See 4B). Then, frequency analysis is performed on these vibration data, and the vibration amplitude A0 corresponding to the N-sided polygon at time t0 and the vibration amplitude A1 corresponding to the N-sided polygon at time t1 are acquired (steps S104 and S106). Then, in step S112, the growth tendency of N-polygonization of the rolling roll 3 is evaluated by comparing the vibration amplitude A0 and the vibration amplitude A1 described above.
  • the vibration amplitude A1 is larger than the vibration amplitude A0, the vibration amplitude A corresponding to the N-sided polygon tends to increase at the rotation speed fr1 of the rolling roll 3. That is, it can be evaluated that the N-sided formation of the rolling roll 3 grows at the rotation speed fr1 of the rolling roll 3.
  • the vibration amplitude A1 corresponding to the N-polygon is smaller than the vibration amplitude A1
  • the vibration amplitude A corresponding to the N-sided polygon tends to decrease at the rotation speed fr2 of the rolling roll 3. That is, it can be evaluated that the N-sided formation of the rolling roll 3 is attenuated at the rotation speed fr2 of the rolling roll 3.
  • the vibration of the frequency (fr ⁇ N) corresponding to the specific N-side is based on the vibration data acquired during the rolling of the metal plate S at the specific rotation speed fr of the rolling roll 3. Since the amplitude (vibration amplitude A) is acquired, the growth tendency of the N-square formation of the rolling roll 3 at the rotation speed fr of the rolling roll 3 (for example, the N-square formation) is based on the change with time of the vibration amplitude A. Whether it is growing or declining, etc.) can be evaluated. Therefore, for example, based on this evaluation, the quality deterioration of the product metal plate can be suppressed by controlling the operation of the rolling apparatus 2 so that the N-sided formation of the rolling roll 3 does not grow.
  • FIG. 5A is a schematic diagram of a frequency spectrum obtained by frequency analysis of vibration data of the rolling roll 3 acquired in a certain sampling period at a specific rotation speed fr of the rolling roll 3.
  • FIG. 5B is a schematic diagram of a frequency spectrum obtained by frequency analysis of the vibration data of the rolling roll 3 acquired in the sampling period after the lapse of time ⁇ t from the sampling period of the vibration data shown in FIG. 5A at the same rotation speed fr. Is.
  • the frequencies fr ⁇ (N-1), fr ⁇ N, and fr ⁇ (N + 1) correspond to the (N-1) polygon, the N polygon, and the (N + 1) polygon, respectively. Indicates the vibration frequency.
  • the vibration amplitude AN-1 (vibration amplitude at the frequency fr ⁇ (N-1)) corresponding to the (N-1) square of the rolling roll 3 is AN-1 i (Fig. It is reduced from 5A) to AN-1 i + 1 (FIG. 5B), and the vibration amplitude AN + 1 (vibration amplitude at frequency fr ⁇ (N + 1)) corresponding to the (N + 1) square of the rolling roll 3 is AN + 1. It decreases from i (Fig. 5A) to AN + 1 i + 1 (Fig. 5B).
  • the N-polygonization of the rolling roll 3 is performed. Can be appropriately suppressed. Further, the N-squared formation of the rolling roll 3 is attenuated by the operation at the changed rotation speed, but the (N + 1) squared formation of the rolling roll 3 proceeds even when the (N + 1) squared formation grows. By changing the number of rotations of the rolling roll 3 before excessively, the progress of (N + 1) polygonization of the rolling roll 3 can be appropriately suppressed.
  • the vibration amplitude A corresponding to the N-sided polygon increases or decreases exponentially during rolling at a constant rotation speed fr. Then, the vibration amplitudes A0 and A1 corresponding to the above-mentioned N-gon at the times t0 and t1 during rolling at the rotation speed fr1 of the rolling roll 3 satisfy the relationship represented by the following formula (A).
  • A1 A0 ⁇ exp ( ⁇ ( ⁇ 1) ⁇ fr1 ⁇ ⁇ t1)... (A)
  • the vibration amplitudes A1 and A2 corresponding to the above-mentioned N-gon at the times t1 and t2 during rolling at the rotation speed fr2 of the rolling roll 3 satisfy the relationship represented by the following formula (B).
  • A2 A1 ⁇ exp ( ⁇ ( ⁇ 2) ⁇ fr2 ⁇ ⁇ t2)...
  • B By generalizing and organizing the above formula (B), the following formula (C) can be obtained.
  • a i + 1 / A i exp ( ⁇ ( ⁇ i + 1 ) ⁇ fr i + 1 ⁇ ⁇ t i + 1 )...
  • the following equation (D) can be obtained by taking the natural logarithms of both sides of the above (C) and arranging them.
  • ⁇ ( ⁇ i + 1 ) ln (A i + 1 / A i ) / (fr i + 1 ⁇ ⁇ t i + 1 )... (D)
  • ⁇ ( ⁇ i ) in the above formulas (A) to (D) 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 ⁇ ”). is there.
  • step S102 vibration data is acquired in the sampling period including the time t1 during rolling at the rotation speed fr2 of the rolling roll and the sampling period including the time t2. Then, frequency analysis is performed on these vibration data, and the vibration amplitude A1 corresponding to the N-sided polygon at time t1 and the vibration amplitude A2 corresponding to the N-sided polygon at time t2 are acquired (steps S104 and S106).
  • step S108 ⁇ ( ⁇ 2) corresponding to the rotation speed fr2 is calculated from the vibration amplitudes A1 and A2, the rotation speed fr2 of the rolling roll 3, and the time length ⁇ t2 between the two sampling periods described above. can do.
  • the length of time between the first sampling period (for example, the sampling period including time t1) and the second sampling period (for example, the sampling period including time t2) (hereinafter, also referred to as the time difference of the sampling period).
  • ⁇ t may be, for example, the difference between the start times of each sampling period, the difference between the end times of each sampling period, or the start time of the first sampling period and the second sampling period. Although it may be the difference from the end time of, each i is acquired by the same calculation method.
  • the ratio of the vibration amplitude A corresponding to the N-sided shape of the rolling roll 3 (A i + 1 / A i ) tends to change with time (increase or decrease of the amplitude, etc.) of the vibration amplitude A during the two sampling periods. ) Is shown. Therefore, as described above, the characteristic value ⁇ acquired based on this ratio (A i + 1 / A i ) is the growth tendency of the N-sided polygonization of the rolling roll 3 during rolling at the rotation speed fr of the rolling roll 3. It can be an index showing the growth or attenuation of N-polygonization). Therefore, by using the characteristic value ⁇ , the growth tendency of N-polygonization of the rolling roll 3 at the rotation speed fr of the rolling roll 3 can be appropriately evaluated.
  • the characteristic value ⁇ calculated by the above formula (D) is the vibration amplitude per unit time because the numerator on the right side of the above formula (D) includes the time difference ( ⁇ t) between the sampling periods of the vibration data. It shows the change of. Therefore, in the region where the characteristic value ⁇ is positive, it is evaluated that the larger the characteristic value ⁇ 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.
  • the unit time of the above-mentioned amplitude between the two sampling periods is determined by the ratio of the vibration amplitude corresponding to the N-sided polygon of the rolling roll 3 (A i + 1 / A i ) and the time difference ⁇ t between the two sampling periods.
  • the characteristic value ⁇ obtained based on the above-mentioned vibration amplitude ratio (A i + 1 / A i ) and the time difference ⁇ t is the N-polygonization of the rolling roll 3 during rolling at the rotation speed fr of the rolling roll 3.
  • step S110 acquisition of the correlation (characteristic diagram) between the rotation speed fr and the characteristic value ⁇ in step S110 (correlation acquisition step) will be described.
  • step S110 as described above, the above steps S102 to S118 are performed at the plurality of rotation speed frs of the rolling roll 3, and the characteristic values ⁇ corresponding to the plurality of rotation speed frs are acquired.
  • the combination of the rotation speed fr and the characteristic value ⁇ acquired in this way may be recorded in the recording unit 60 (see FIG. 2).
  • the correlation (characteristic diagram) between the rotation speed fr and the characteristic value ⁇ can be acquired.
  • FIG. 6 is a diagram showing a typical example of the correlation (characteristic diagram) between the rotation speed fr and the characteristic value ⁇ acquired in step S110.
  • ⁇ 1 (that is, the frequency fr ⁇ N corresponding to the N-square is equal to the natural frequency of the rolling roll 3 regardless of “N”.
  • ⁇ is larger than zero, and in particular, ⁇ is maximized when ⁇ 2. That is, in this rotation speed region, the N-polygonization of the rolling roll 3 grows (progresses), and the larger the ⁇ , the faster the growth rate of the N-polygonization of the rolling roll 3.
  • ⁇ 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 ⁇ , the faster the attenuation speed of the N-gonification of the rolling roll 3.
  • ⁇ 0, the N-sided formation of the rolling roll 3 does not grow or decay.
  • step S112 After acquiring the above-mentioned characteristic diagram (correlation) in step S110, in step S112, the growth tendency of N-polygonization of the rolling roll 3 during rolling at the rotation speed fr of the rolling roll 3 is evaluated based on this characteristic diagram. can do. That is, by using the above-mentioned characteristic diagram, ⁇ corresponding to various rotation speed frs of the rolling roll 3 can be obtained, so that the growth tendency of N-polygonization corresponding to a specific rotation speed of the rolling roll 3 can be obtained. Can be evaluated.
  • the ⁇ corresponding to the current rotation speed of the rolling roll 3 can be grasped to grasp the growth tendency of the N-sided polygonization of the rolling roll 3 at the present time, or the rotation of the rolling roll 3 scheduled to be changed in the future. It is possible to predict the growth tendency of N-polygonization of the rolling roll 3 by the number.
  • step S110 the steel grade data (including information such as the material and hardness of each steel grade) is read from the steel grade data storage unit 96 (see FIG. 2), and the combination of the rotation speed fr and the characteristic value ⁇ together with the steel grade data. Is recorded in the recording unit 60 (see FIG. 2), and a characteristic diagram (correlation between the rotation speed fr and the characteristic value ⁇ ) may be acquired for each steel type based on this recording.
  • the evaluation result in step S112 may be output to the display unit 98 (display or the like) via the output unit 72 (see FIG. 2).
  • FIG. 8 is a diagram showing an example of the evaluation result displayed on the display unit 98.
  • a graph of the correlation between the rotation speed fr (that is, ⁇ ) and the characteristic value ⁇ , and a plurality of types of N polygons (N 39, 40, 41) at the current rotation speed fr of the rolling roll 3
  • the characteristic value ⁇ corresponding to each of the above is shown as a point on the graph.
  • a graph showing the correlation between the rotation number fr and the characteristic value ⁇ can be obtained individually, but as shown in the graph of FIG. 8 (and FIG.
  • the natural vibration of the number of polygons N and the rolling roll 3 When graphing using the parameter ⁇ obtained by normalizing the rotation number fr with the number fn, the correlation curves (characteristic diagrams) for a plurality of types of N-gonal numbers may almost overlap.
  • vibration data of the rolling roll 3 is acquired during the sampling period including the time t1 and frequency analysis is performed to obtain the vibration data of the rolling roll 3 in the sampling period including the time t1.
  • the vibration amplitude A1 corresponding to the N-sided polygon is acquired.
  • step S110 it acquired in step S110, based on the correlation between the rotational speed fr and the characteristic value sigma, the vibration amplitude when the rolling at a rotation number fr1 of the rolling rolls 3 and continued from the time t1 reaches the threshold A th The time to time ⁇ t c is calculated.
  • the characteristic value ⁇ indicates the change in amplitude during the time ⁇ ti + 1 as a ratio (A i + 1 / A i ) during rolling at the rotation speed fr i + 1 of the rolling roll 3. Therefore, the equation (D), the characteristic value ⁇ 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 Using A ⁇ Ath ) and the time ⁇ t c from A to Ath of the vibration amplitude, it can be expressed as the following equation (E).
  • 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 ⁇ .
  • the time ⁇ t c until the vibration amplitude corresponding to the N-side polygon of the rolling roll 3 reaches the predetermined threshold At th is calculated (predicted). That is, since the time until the N-sided polygonization of the rolling roll 3 reaches a predetermined degree (threshold Ath ) is calculated, for example, operating conditions (rolling roll rotation speed, etc.) are calculated before the calculated time elapses.
  • the correction unit 70 after acquiring the correlation (characteristic diagram) between the rotation speed fr of the rolling roll 3 and the characteristic value ⁇ , the correction unit 70 (see FIG. 2) is used during rolling using the rolling roll 3.
  • the above-mentioned correlation (characteristic diagram) may be modified based on the data regarding the vibration amplitude corresponding to the N-square, which is acquired from the acquired vibration data.
  • the characteristic value ⁇ during rolling at the rotation speed fr1 is set to the vibration amplitude A1 corresponding to the N-sided polygon at the time t1 during rolling at the rotation speed fr1 and the time t2 during rolling at the rotation speed fr1.
  • ⁇ ln (A2 / A1) / (fr1 ⁇ ⁇ t)... (G)
  • the characteristic value ⁇ can be calculated. That is, regarding the characteristic value ⁇ corresponding to the rotation speed fr1 of the rolling roll 3, the characteristic value ⁇ based on the actually measured value (calculated from the above equation (G)) and the characteristic value ⁇ based on the correlation (characteristic diagram). You can get both. Therefore, by modifying the correlation (characteristic diagram) based on the characteristic value ⁇ based on the actually measured value, a more accurate correlation (characteristic diagram) can be obtained.
  • the correlation (characteristic diagram) between the rotation frequency fr of the rolling roll 3 and the characteristic value ⁇ is acquired, it is acquired from the vibration data acquired during the actual rolling using the rolling roll 3. Since the correlation between the rotation speed fr and the characteristic value ⁇ was corrected based on the data on the vibration amplitude of the frequency corresponding to the N-side of the rolling roll 3, the N of the rolling roll 3 was based on the correlation. The growth tendency of keratinization can be evaluated more accurately.
  • the vibration showing the vibration of each rolling roll 3 (work roll 4A, 4B or backup roll 6A, 6B) is attached to the roll chock (roll chock 5A, 5B, 7A or 7B) supporting the rolling roll 3.
  • the embodiment (see FIG. 1) acquired by using the measuring unit 90 (specifically, the acceleration sensors 91 to 94) has been described, the mode of the vibration measuring unit 90 is not limited to this.
  • the vibration measuring unit may be configured to detect the vibration of the housing supporting the rolling rolls 3 (work rolls 4A, 4B and backup rolls 6A, 6B). In this case, based on the vibration data obtained by the vibration measuring unit, it is possible to evaluate the growth tendency of the N-polygonization of the rolling roll 3 supported by the housing. For example, it is possible to detect that N-polygonization is growing or decaying in any of the rolling rolls 3 supported by the housing. In this way, after identifying the rolling stand including the housing in which the growth of N-polygonization of the rolling roll 3 is detected, a vibration measuring unit is installed for each of the plurality of rolling rolls 3 included in the rolling stand. Then, the growth tendency of the N-polygonization of each rolling roll 3 may be evaluated individually.
  • the method for evaluating the state of the rolling mill is It is a method for evaluating the growth tendency of N-polygonization in which the rolling roll of the rolling apparatus is unevenly worn to become N-gonal.
  • a vibration data acquisition step of acquiring vibration data indicating the vibration of the rolling roll in each of a plurality of sampling periods, and a vibration data acquisition step.
  • An amplitude acquisition step of performing frequency analysis on each of the vibration data acquired during the plurality of sampling periods and acquiring the amplitude of the vibration at the frequency corresponding to the N-gon.
  • an evaluation step for evaluating the growth tendency of the N-polygonization of the rolling roll during rolling at the rotation speed fr Based on the time course of the amplitude acquired for each of the vibration data, an evaluation step for evaluating the growth tendency of the N-polygonization of the rolling roll during rolling at the rotation speed fr, and an evaluation step.
  • the present inventors have found that when the N-squared rolling roll grows during rolling, the amplitude of the frequency component corresponding to the N-squared shape contained in the vibration of the rolling roll increases with the passage of time. It was also found that when the N-square formation of the rolling roll is attenuated during rolling, the amplitude of the frequency component corresponding to the N-square contained in the vibration of the rolling roll decreases with the passage of time.
  • the frequency corresponding to the specific N-side is based on the vibration data acquired during the rolling of the material (metal plate, etc.) at the specific rotation speed fr of the rolling roll. Since the amplitude of the vibration of the rolling roll is acquired, the growth tendency of the N-squared formation of the rolling roll at the rotation speed fr of the rolling roll (for example, whether the N-squared formation is growing or decaying) based on the time course of the amplitude. Whether or not, etc.) can be evaluated. Therefore, for example, based on this evaluation, it is possible to suppress the deterioration of the quality of the product metal plate by controlling the operation of the rolling apparatus so that the N-sided formation of the rolling roll does not grow.
  • the rolling during rolling at the rotation speed fr is based on the ratio of the amplitudes acquired in the amplitude acquisition step. Further provided with a characteristic value acquisition step of acquiring a characteristic value ⁇ indicating an index of a time-dependent change in the amplitude of vibration at a frequency corresponding to the N-side of the roll. In the evaluation step, the growth tendency of the N-polygonization during rolling at the rotation speed fr is evaluated based on the characteristic value ⁇ .
  • the ratio of the vibration amplitudes of the frequencies corresponding to the N-gons of the rolling rolls which are obtained from the vibration data acquired in two different sampling periods during rolling at the rolling speed fr.
  • the characteristic value ⁇ is acquired based on.
  • the ratio of the vibration amplitudes of the above frequencies indicates the tendency of the vibration amplitudes of the above frequencies to change with time (increase or decrease of the amplitude, etc.) between the two sampling periods, and is based on this ratio.
  • the characteristic value ⁇ obtained can be an index showing the growth tendency of N-polygonization of the rolling roll (growth or attenuation of N-polygonization, etc.) during rolling at the rotation speed fr of the rolling roll. Therefore, according to the configuration of (2) above, the growth tendency of N-polygonization of the rolling roll at the rotation speed fr of the rolling roll can be appropriately evaluated.
  • the characteristic value acquisition step the characteristic value ⁇ is acquired based on the ratio of the amplitude and the length of time between the two different sampling periods.
  • the ratio of the vibration amplitudes of the frequencies corresponding to the N-sides of the rolling rolls which are obtained from the vibration data acquired in two different sampling periods during rolling at the rolling speed fr.
  • the characteristic value ⁇ is acquired based on the length of time between the two sampling periods (the time difference between the two sampling periods). That is, since the degree of change of the above-mentioned amplitude per unit time between the two sampling periods can be known from the above-mentioned amplitude ratio and the above-mentioned time difference, it is based on the above-mentioned amplitude ratio and the above-mentioned time difference.
  • the characteristic value ⁇ obtained can be an index of the growth or decay rate of N-squared formation of the rolling roll during rolling at the rotation speed fr of the rolling roll. Therefore, according to the configuration of (3) above, the growth tendency of N-polygonization of the rolling roll at the rotation speed fr of the rolling roll can be appropriately evaluated.
  • the characteristic value ⁇ is acquired by executing the vibration data acquisition step, the amplitude acquisition step, and the characteristic value acquisition step for each of the plurality of rotation speed frs, and thus obtained.
  • the correlation between the rotation speed fr and the characteristic value ⁇ is obtained from a plurality of combinations of the rotation speed fr and the characteristic value ⁇ . Therefore, based on the correlation between the rotation speed fr obtained in this way and the characteristic value ⁇ , the growth tendency of N-polygonization of the rolling roll can be appropriately evaluated. Therefore, for example, it is necessary to evaluate whether or not the N-polygonization of the rolling roll grows under specific operating conditions (rolling roll rotation speed, etc.), or what the growth rate of the N-polygonization of the rolling roll is.
  • the step includes a step of acquiring the amplitude of the vibration in the sampling period including the time t1 based on the vibration data acquired during rolling at the rotation speed fr1 of the rolling roll.
  • the time until the amplitude reaches the threshold value when rolling at the rotation speed fr1 is continued from the time t1 is calculated based on the correlation.
  • the amplitude A1 of the vibration corresponding to the N-sided polygon of the rolling roll at time t1 is acquired from the vibration data at time t1 during rolling at the rotation speed fr1 of the rolling roll. Then, based on the above-mentioned correlation between the rotation speed fr and the characteristic value ⁇ (correlation indicating the growth tendency of N-polygonization of the rolling roll), when rolling is continued from the time t1 at the rotation speed fr1 of the rolling roll. , Calculate (predict) the time until the vibration amplitude corresponding to the N-sided shape of the rolling roll reaches a predetermined threshold value.
  • the operating conditions may be changed before the calculated time elapses.
  • the degree of N-polygonization of the rolling rolls By exchanging the rolling rolls, it is possible to prevent the degree of N-polygonization of the rolling rolls from becoming too large. As a result, deterioration of the quality of the product metal plate after rolling can be suppressed.
  • the step includes a step of correcting the correlation based on the data regarding the amplitude of the vibration acquired from the vibration data acquired during rolling using the rolling roll after acquiring the correlation.
  • the vibration amplitude of the frequency corresponding to the N-side of the rolling roll which is acquired from the vibration data actually acquired during rolling using the rolling roll. Since the correlation between the rotation frequency fr and the characteristic value ⁇ is corrected based on the data related to the above, the growth tendency of the N-squared rolling roll based on the correlation can be evaluated more accurately.
  • the state evaluation device for the rolling mill is It is a device for evaluating the growth tendency of N-polygonization due to uneven wear of rolling rolls of a rolling device.
  • a vibration data acquisition unit configured to acquire vibration data indicating vibration of the rolling roll during each of a plurality of sampling periods during rolling at the rotation speed fr of the rolling roll.
  • An amplitude extraction unit configured to perform frequency analysis on each of the vibration data acquired during the plurality of sampling periods and acquire the amplitude of the vibration at the frequency corresponding to the N-gon.
  • An evaluation unit configured to evaluate the growth tendency of the N-polygonization of the rolling roll during rolling at the rotation speed fr based on the time course of the amplitude acquired for each of the vibration data.
  • An output unit that outputs the evaluation result by the evaluation unit and To be equipped.
  • the vibration of the frequency corresponding to the specific N-side is based on the vibration data acquired during the rolling of the material (metal plate, etc.) at the specific rotation speed fr of the rolling roll. Since the amplitude is acquired, the growth tendency of the N-squared formation of the rolling roll at the rotation speed fr of the rolling roll (for example, whether or not the N-squared formation is growing or decaying, etc.) based on the time course of the amplitude is obtained. ) Can be evaluated. Therefore, for example, based on this evaluation, it is possible to suppress the deterioration of the quality of the product metal plate by controlling the operation of the rolling apparatus so that the N-sided formation of the rolling roll does not grow.
  • 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 state evaluation device according to (7) above, which is configured to evaluate the growth tendency of N-polygonization due to uneven wear of the rolling roll. To be equipped.
  • the vibration of the frequency corresponding to the specific N-side is based on the vibration data acquired during the rolling of the material (metal plate, etc.) at the specific rotation speed fr of the rolling roll. Since the amplitude is acquired, the growth tendency of the N-squared formation of the rolling roll at the rotation speed fr of the rolling roll (for example, whether or not the N-squared formation is growing or decaying, etc.) based on the time course of the amplitude is obtained. ) Can be evaluated. Therefore, for example, based on this evaluation, it is possible to suppress the deterioration of the quality of the product metal plate by controlling the operation of the rolling apparatus so that the N-sided formation of the rolling roll does not grow.
  • 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.
  • 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.
  • the expression “comprising”, “including”, or “having” one component is not an exclusive expression excluding the existence of another component.
  • Rolling equipment 1 Rolling equipment 2 Rolling equipment 3 Rolling rolls 4A, 4B Work rolls 5A, 5B Roll chock 6A, 6B Backup rolls 7A, 7B Roll chock 8 Rolling device 10, 10A to 10C Rolling stand 50 Condition evaluation device 52 Vibration data acquisition unit 54 Frequency analysis unit 56 Oscillation extraction unit 60 Recording unit 62 Characteristic value calculation unit 66 Correlation acquisition unit 68 Evaluation unit 70 Correction unit 72 Output unit 90 Vibration measurement unit 91 to 94 Accelerometer 95 Roll rotation speed measurement unit 96 Steel type data storage unit 98 Display unit S Metal plate

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

La présente invention concerne un procédé d'évaluation d'état d'un dispositif de laminage destiné à évaluer la tendance à la croissance de la N-polygonisation dans laquelle les cylindres de laminage du dispositif de laminage sont portés de manière irrégulière dans un N-polygone, le procédé comprenant : une étape d'acquisition de données de vibration destinée, pendant le laminage à une vitesse de rotation fr du cylindre de laminage, à acquérir des données de vibration indiquant la vibration du cylindre de laminage dans chacune d'une pluralité de périodes d'échantillonnage ; une étape d'acquisition d'amplitude destinée à effectuer une analyse de fréquence sur chacune des données de vibration acquises pendant la pluralité de périodes d'échantillonnage et acquérir l'amplitude de la vibration à la fréquence correspondant au N-polygone ; et une étape d'évaluation destinée à évaluer la tendance à la croissance de la N-polygonisation du cylindre de laminage pendant le laminage à la vitesse de rotation fr, sur la base de la variation en fonction du temps de l'amplitude acquise pour chacune des données de vibration.
PCT/JP2019/031332 2019-08-08 2019-08-08 Procédé d'évaluation d'état et dispositif d'évaluation d'état de dispositif de laminage, et équipement de laminage WO2021024447A1 (fr)

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CN201980097273.3A CN114007774B (zh) 2019-08-08 2019-08-08 轧制装置的状态评价方法及状态评价装置以及轧制设备
PCT/JP2019/031332 WO2021024447A1 (fr) 2019-08-08 2019-08-08 Procédé d'évaluation d'état et dispositif d'évaluation d'état de dispositif de laminage, et équipement de laminage
JP2021538643A JP7179996B2 (ja) 2019-08-08 2019-08-08 圧延装置の状態評価方法及び状態評価装置並びに圧延設備

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