EP0638375B1 - Procédé et dispositif pour la surveillance de l'apparition du broutage dans des commandes symétriques doubles de cages de laminoir - Google Patents

Procédé et dispositif pour la surveillance de l'apparition du broutage dans des commandes symétriques doubles de cages de laminoir Download PDF

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Publication number
EP0638375B1
EP0638375B1 EP94105906A EP94105906A EP0638375B1 EP 0638375 B1 EP0638375 B1 EP 0638375B1 EP 94105906 A EP94105906 A EP 94105906A EP 94105906 A EP94105906 A EP 94105906A EP 0638375 B1 EP0638375 B1 EP 0638375B1
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EP
European Patent Office
Prior art keywords
oscillations
drive
exceeding
amplitude
frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94105906A
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German (de)
English (en)
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EP0638375A1 (fr
Inventor
Werner Dipl.-Ing. Schnalzger
Johann Dipl.-Ing. Wokusch
Bernhard Dipl.-Ing. Weisshaar
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Siemens AG
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Siemens AG
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Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP94105906A priority Critical patent/EP0638375B1/fr
Priority to US08/272,491 priority patent/US5515731A/en
Publication of EP0638375A1 publication Critical patent/EP0638375A1/fr
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Publication of EP0638375B1 publication Critical patent/EP0638375B1/fr
Anticipated expiration legal-status Critical
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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
    • B21B37/007—Control for preventing or reducing vibration, chatter or chatter marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/008—Monitoring or detecting vibration, chatter or chatter marks

Definitions

  • the upper roll and the lower roll of the roll stand are driven separately by an upper and a lower motor.
  • the coupling of each motor via a more or less torsionally rigid shaft to the associated roller results in a structure capable of torsional vibrations. Strong changes in the friction values in the roll gap can start a self-excitation process, the rotational energy supplied to the rolls being converted into torsional vibration energy.
  • the mechanical torsional vibration behavior of the twin drive is damped in such a way that the speed control for the motors can no longer stabilize sufficiently. If the adhesion between the two rollers is lost, slipping processes and, as a result, the so-called rattling start.
  • the invention is therefore based on the object of enabling a quick and reliable differentiation between operational tapping vibrations and chatter vibrations.
  • the object is achieved by a method for chatter monitoring in twin drives of rolling stands, in which vibrations of the upper drive and vibrations of the lower drive are detected, the detected vibrations are monitored for exceeding a predetermined amplitude, in the event of an amplitude exceeding a chatter detection signal is generated and at furthermore, the frequencies of the vibrations of the upper drive and the lower drive are monitored for equality and, in the event of a frequency equality, the chatter detection signal is suppressed.
  • the object is achieved by a device for chatter monitoring in twin drives of rolling stands with a device for detecting vibrations of the upper drive, with a device for detecting vibrations of the lower drive, with a device for monitoring the detected vibrations for exceeding a predetermined amplitude and for generating a chatter detection signal when the amplitude is exceeded and with a device for monitoring the frequencies of the detected vibrations for equality and for suppressing the chatter detection signal in the event of frequency equality.
  • the invention takes advantage of the phenomenon that operational tapping vibrations and chatter vibrations differ in their natural frequencies.
  • the upper and lower rollers adhere to one another so that both rollers vibrate at a common natural frequency due to the mechanical coupling. If, on the other hand, slipping occurs and liability is lost, the upper and lower rollers and the associated drives vibrate with their own natural frequencies, the natural frequencies of the upper drive and lower drive being different because of the generally unequal length of the drive shafts.
  • the amplitude and frequency monitoring of the detected vibrations takes place in an advantageous manner in that vibration-influenced measured variables, such as. B. the drive speed or the drive torque of the upper drive and vibration-influenced measured variables of the lower drive each an arrangement of bandpass filters with staggered center frequencies in the natural frequency range of the drives that the output signals of the bandpass filter are monitored for exceeding the predetermined amplitude and that to monitor the vibrations of the upper drive and of the sub-drive for frequency equality, the output signals of all bandpass filter pairs with bandpass filters for the top drive and the bottom drive and corresponding center frequency are compared.
  • vibration-influenced measured variables such as. B. the drive speed or the drive torque of the upper drive and vibration-influenced measured variables of the lower drive each an arrangement of bandpass filters with staggered center frequencies in the natural frequency range of the drives that the output signals of the bandpass filter are monitored for exceeding the predetermined amplitude and that to monitor the vibrations of the upper drive and of the sub-drive for frequency equality
  • the subdivision of the natural frequency ranges of the two drives by means of the bandpass filter into a grid of frequency intervals enables a very fast frequency comparison of the vibrations of the two drives without great circuitry or computational effort.
  • the output signals of each pair of bandpass filters are preferably monitored for the joint exceeding of a limit value.
  • the output signals of each pair of bandpass filters can be subtracted from one another, the difference signal thus obtained being monitored for a limit value being exceeded.
  • an evaluation is carried out, preferably an AND operation of all limit value violations detected in the bandpass filter pairs.
  • the limit value can also be evaluated characterized in that with a predetermined number of bandpass filter pairs with center frequencies in a predetermined relation to each other, for. B. immediately adjacent center frequencies, a limit violation must be detected in order to derive a frequency equality of the considered vibrations.
  • the output signal of each bandpass filter is rectified and differentiated in parallel, rectified, multiplied by the reciprocal of the center frequency of the bandpass filter and then added to the rectified output signal.
  • the amplitude monitoring of the detected vibrations is carried out in the simplest manner in that the output signal with the greatest amplitude is selected from the output signals of the bandpass filter and used to monitor whether the predetermined amplitude has been exceeded.
  • the rolling speed is reduced when the chatter detection signal occurs until the slipping stops and the lost adhesion between the top and bottom rollers is restored.
  • the detected vibrations of the upper drive and the lower drive are monitored for exceeding different amplitudes, that when the lower amplitude is exceeded there is a ramp-like reduction in the rolling speed and when the higher amplitude is exceeded there is a sudden reduction in the rolling speed .
  • FIG. 1 shows a roll stand 1 with two work rolls, namely an upper roll 2 and a lower roll 3, and associated supporting rolls 4 and 5.
  • the upper roll 2 and the lower roll 3 are driven by a twin drive, in which two separate motors 6 and 7 via drive shafts 8 and 9 and universal joints 10 are connected to the upper roller 2 and the lower roller 3. Since the universal joints 10 can only compensate for a limited angle, the center distance in the two motors 6 and 7 must be kept small in order to limit the length of the drive shafts 8 and 9. The size of the two motors 6 and 7 therefore requires an offset arrangement of the two motors 6 and 7.
  • the circuit shown in FIG. 2 for the detection of chatter vibrations is fed at a point 11 with a measurable variable M o which can be influenced by vibrations of the upper drive and at a point 12 with a vibrated measured variable M u of the lower drive.
  • the measured variables M o and M u can be, for example, the speed, the torque or the drive current act in engines 6 and 7.
  • the measured variable M o of the top drive is fed to a plurality of bandpass filters 13 with different center frequencies staggered between the minimum and maximum natural frequency of the twin drive. Each of the bandpass filters 13 is followed by a link 14 for forming the amount of the bandpass filter signals and a link 15 for signal smoothing.
  • the measured variable M u of the lower drive is also fed to a number of bandpass filters 16, the center frequencies of which are staggered in the same way as for the bandpass filters 13.
  • the band filters 16 are also each followed by a link 17 for forming the amount of the bandpass filter signals and a link 18 for signal smoothing.
  • the smoothed amounts of the bandpass filter signals at the outputs of the elements 15 and 18 are fed to a maximum value detector 19, which selects and switches on the maximum of the input signals fed to it.
  • the maximum value detector 19 is followed by two threshold value detectors 20 and 21, each of which generates an output signal when the maximum value supplied to them exceeds a predetermined threshold value.
  • the threshold value detector 20 is set to a lower threshold value and the threshold value detector 21 is set to a higher threshold value.
  • the output signal of the threshold value detector 20 is fed to an AND gate 22 and that of the threshold value detector 21 to a further AND gate 23.
  • vibrations occur within the twin drive, the vibration maximum contained in the frequency spectrum of the vibrations is monitored for exceeding two different amplitudes. If the lower amplitude is exceeded, a chatter detection signal R1 is generated at the output of the AND gate 22 and a further chatter detection signal R2 is generated at the output of the AND gate 23 if the additional condition is met that the current speeds of the twin drive are met exceed a predetermined value and that the vibrations detected are not operational tapping vibrations.
  • the speeds n o and n u of the upper drive and the lower drive are fed to the circuit at points 24 and 25.
  • the speeds n o and n u are monitored after the amount has been formed in amount-forming elements 26 and 27, regardless of the direction of rotation in limit value indicators 28 and 29, for exceeding a limit, for example 5% of the maximum speed.
  • Each of the two limit indicators 28 and 29 is connected at its output to the two AND gates 22 and 23.
  • each of the individual elements 15 and 18 for signal smoothing is followed by a limit value detector 30 or 31, which then generates an output signal when the smoothed amount of the bandpass filter signal has a limit value, for example 5% of the amount of the measured variables M o or M u .
  • the outputs of two limit detectors 30 and 31, one of which is assigned to a bandpass filter 13 for the upper drive and the other to a bandpass filter 16 with the same center frequency for the lower drive, are each followed by an antivalence element (exclusive OR) 32, which then outputs an output signal generated when only one of the two limit detectors 30 and 31 reports that the limit has been exceeded.
  • the outputs of the antivalence gates 32 are fed to an OR gate 33, which is connected on the output side to each of the two AND gates 22 and 23. So if in any of the staggered frequency intervals defined by the bandpass filter pairs 13, 16, the vibrations for the one drive, z. B. the top drive, exceed the limit, while in the same frequency interval for the other drive, z. B. the underdrive, no vibrations exceeding the limit value are detected, this indicates that there is no liability between the upper roller 2 and the lower roller 3, so that the upper and lower drive vibrate independently of one another with different natural frequencies. In this case, the generation of the chatter detection signals R1 and R2 is released.
  • the chatter detection signal R1 which is generated when the chatter vibrations exceed the lower threshold value of the threshold value detector 20, is used to switch an integrator 34 on and off.
  • a direction of rotation signal D is fed to the integrator 34 on the input side, which signal has the value +1 or -1 depending on the rolling direction or direction of rotation of the twin drive.
  • the integrator 34 generates a ramp-shaped output signal with an increasing or decreasing ramp from this direction of rotation signal D, the level of the output signal being limited in a subsequent stage 35. If the detected chatter vibration exceeds the higher threshold value of the threshold value detector 21, a stepped output signal is generated with the help of a controllable switch 36, the value of which jumps from 0 to 1 or from 0 to -1 depending on the rolling direction.
  • the rotational speed for the twin drive is reduced either in the form of a ramp or jump, depending on whether the detected chatter vibrations exceed the lower or the higher threshold value.
  • FIG. 4 shows a circuit variant that differs from the circuit shown in FIG. 2 only in that, instead of the limit indicators 30, 31 and antivalence elements, 32 subtractors 38 with subordinate amount-forming elements 39 and limit indicators 40 are provided.
  • the rectified and smoothed output signals of the bandpasses 13 and 16 assigned to the upper and lower drive with a matching center frequency are subtracted from one another, the difference signal obtained in this way being monitored after its rectification for exceeding a limit value.
  • each bandpass filter 13 or 16 is additionally differentiated in a differentiating element 41, rectified in an amount-forming element 42 and multiplied in a multiplier 43 by the reciprocal of the respective center frequency ⁇ BP of the bandpass filter 13 or 16 before it is added in a summing element 44 is added to the rectified output signal of the bandpass filter 13 or 16.
  • the ripple of the signal at the input of the signal smoothing element 15 or 18 is reduced, so that the smoothing effect and thus the signal delay of the signal smoothing element 15 or 18 can be reduced.

Claims (11)

  1. Procédé destiné à contrôler le broutage de commandes par moteurs jumelés de cages de laminoirs (1), selon lequel on détecte des vibrations du moteur supérieur (2, 4, 6, 8) et des vibrations du moteur inférieur (3, 5, 7, 9), selon lequel on contrôle si les vibrations détectées dépassent une amplitude prédéterminée, selon lequel on produit un signal de détection de broutage (R1, R2) dans le cas d'un dépassement d'amplitude, selon lequel on contrôle pa ailleurs le synchronisme des fréquences des vibrations du moteur supérieur (2, 4, 6, 8) et du moteur inférieur (3, 5, 7, 9), et selon lequel on supprime le signal de détection de broutage (R1, R2) en cas de synchronisme des fréquences.
  2. Procédé selon la revendication 1,
       caractérisé par le fait que,
       on envoie des grandeurs de mesure (Mo) influencées par des vibrations du moteur supérieur (2, 4, 6, 8) et des grandeurs de mesure (Mu) influencées par des vibrations du moteur inférieur (3, 5, 7, 9) à un dispositif de filtres passe-bande (13, 16) ayant des fréquences centrales échelonnées dans la plage de fréquence propre des moteurs, on contrôle si les signaux de sortie des filtres passe-bande (13, 16) dépasse l'amplitude prédéterminée, et que pour contrôler le synchronisme des fréquences des vibrations du moteur supérieur (2, 4, 6, 8) et du moteur inférieur (3, 5, 7, 9), on compare entre eux les signaux de sortie de tous les couples de filtres passe-bande ayant des filtres passe-bande (13, 16) pour le moteur supérieur (2, 4, 6, 8) et pour le moteur inférieur (3, 5, 7, 9) et une fréquence centrale concordant.
  3. Procédé selon la revendication 2,
       caractérisé par le fait que,
       pour contrôler le synchronisme des fréquences des vibrations du moteur supérieur (2, 4, 6, 8) et du moteur inférieur (3, 5, 7, 9), on contrôle si les signaux de sortie de chaque couple de filtres passe-bande (13, 16) dépassent en commun une valeur limite.
  4. Procédé selon la revendication 2,
       caractérisé par le fait que,
       pour contrôler le synchronisme des fréquences des vibrations du moteur supérieur (2, 4, 6, 8) et du moteur inférieur (3, 5, 7, 9), on soustrait l'un de l'autre les signaux de sortie de chaque couple de filtres passe-bande (13, 16), et on contrôle si le signal différentiel ainsi obtenu dépasse une valeur limite.
  5. Procédé selon la revendication 3 ou 4,
       caractérisé par le fait que,
       pour déterminer le synchronisme des fréquences des vibrations du moteur supérieur (2, 4, 6, 8) et du moteur inférieur (3, 5, 7, 9), on procède à une exploitation, notamment à une combinaison ET, de tous les dépassements de valeur limite détectés dans les couples de filtres passe-bande (13, 16).
  6. Procédé selon l'une quelconque des revendications 2 à 5,
       caractérisé par le fait que,
       l'on choisit parmi les signaux de sortie des filtres passe-bande (13, 16) le signal de sortie de plus grande amplitude et on l'utilise pour contrôler le dépassement de l'amplitude prédéterminée.
  7. Procédé selon l'une quelconque des revendications 2 à 6,
       caractérisé par le fait que,
       on redresse le signal de sortie de chaque filtre passe-bande (13, 16) et, parallèlement, on le différencie, on le redresse et on le multiplie par la valeur inverse de la fréquence centrale (ωBP) du filtre passe-bande (13, 16), et on l'additionne ensuite au signal de sortie redressé.
  8. Procédé selon l'une quelconque des revendications précédentes,
       caractérisé par le fait que,
       l'on réduit la vitesse de laminage (n) lors de l'apparition du signal de détection de broutage (R1, R2).
  9. Procédé selon la revendication 8,
       caractérisé par le fait que,
       on contrôle si les vibrations détectées du moteur supérieur (2, 4, 6, 8) et du moteur inférieur (3, 5, 7, 9) dépassent des amplitudes différentes, on réduit la vitesse de laminage (n) en forme de rampe lors du dépassement de l'amplitude qui est respectivement la plus faible, et l'on réduit la vitesse de laminage (n) de façon discontinue lors du dépassement de l'amplitude qui est respectivement la plus grande.
  10. Dispositif destiné à contrôler le broutage de commandes par moteurs jumelés de cages de laminoirs, comportant un dispositif de détection de vibrations du moteur supérieur (2, 4, 6, 8), un dispositif de détection de vibrations du moteur inférieur (3, 5, 7, 9), un dispositif (20, 21) destiné à contrôler si les vibrations détectées dépassent une amplitude prédéterminée et à générer un signal de détection de broutage (R1, R2) en cas de dépassement d'amplitude, et un dispositif (13 à 18), (30 à 33) destiné à surveiller le synchronisme des fréquences des vibrations détectées et à supprimer le signal de détection de broutage (R1, R2) en cas de synchronisme des fréquences.
  11. Dispositif selon la revendication 10,
       caractérisé par le fait que,
       les dispositifs de détection des vibrations comportent un dispositif à filtres passe-bande (13, 16) à fréquences centrales échelonnées.
EP94105906A 1993-07-13 1994-04-15 Procédé et dispositif pour la surveillance de l'apparition du broutage dans des commandes symétriques doubles de cages de laminoir Expired - Lifetime EP0638375B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP94105906A EP0638375B1 (fr) 1993-07-13 1994-04-15 Procédé et dispositif pour la surveillance de l'apparition du broutage dans des commandes symétriques doubles de cages de laminoir
US08/272,491 US5515731A (en) 1993-07-13 1994-07-08 Method and device for monitoring chatter in twin drives of roll stands

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP93111230 1993-07-13
EP93111230 1993-07-13
EP94105906A EP0638375B1 (fr) 1993-07-13 1994-04-15 Procédé et dispositif pour la surveillance de l'apparition du broutage dans des commandes symétriques doubles de cages de laminoir

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EP0638375A1 EP0638375A1 (fr) 1995-02-15
EP0638375B1 true EP0638375B1 (fr) 1996-11-13

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Cited By (1)

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WO2024074265A1 (fr) * 2022-10-06 2024-04-11 Sms Group Gmbh Procédé d'analyse du comportement vibratoire d'un système

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KR100543820B1 (ko) * 1999-05-27 2006-01-23 제이에프이 스틸 가부시키가이샤 냉간 압연기의 채터링 검지방법 및 장치
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JP5003492B2 (ja) * 2006-08-03 2012-08-15 東芝三菱電機産業システム株式会社 圧延ロール用電動機の駆動装置
FR2910198B1 (fr) * 2006-12-13 2009-03-13 Peugeot Citroen Automobiles Sa Procede de commande d'un moteur electrique de vehicule hybride ou elctrique
CN103331310A (zh) * 2013-07-13 2013-10-02 吉林大学 镁合金板材轧制参数监测与故障诊断系统及方法
CN105700477B (zh) * 2016-04-28 2018-05-04 上海交通大学 一种基于颤振频率的加工颤振智能抑制方法
JP6702405B1 (ja) 2018-12-27 2020-06-03 Ｊｆｅスチール株式会社 冷間圧延機のチャタリング検出方法、冷間圧延機のチャタリング検出装置、冷間圧延方法、及び冷間圧延機
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Publication number Priority date Publication date Assignee Title
WO2024074265A1 (fr) * 2022-10-06 2024-04-11 Sms Group Gmbh Procédé d'analyse du comportement vibratoire d'un système

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US5515731A (en) 1996-05-14

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