EP0662017B1 - Procede visant a supprimer l'influence qu'exercent les excentricites des rouleaux sur le reglage de l'epaisseur des produits a laminer passes dans une cage de laminoir - Google Patents

Procede visant a supprimer l'influence qu'exercent les excentricites des rouleaux sur le reglage de l'epaisseur des produits a laminer passes dans une cage de laminoir Download PDF

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Publication number
EP0662017B1
EP0662017B1 EP93919021A EP93919021A EP0662017B1 EP 0662017 B1 EP0662017 B1 EP 0662017B1 EP 93919021 A EP93919021 A EP 93919021A EP 93919021 A EP93919021 A EP 93919021A EP 0662017 B1 EP0662017 B1 EP 0662017B1
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EP
European Patent Office
Prior art keywords
roll
signal fluctuations
eccentricities
signal
statistical evaluation
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
EP93919021A
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German (de)
English (en)
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EP0662017A1 (fr
Inventor
Klaus-Dieter Berger
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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
Publication of EP0662017A1 publication Critical patent/EP0662017A1/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
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/66—Roll eccentricity compensation systems

Definitions

  • the invention relates to a method for suppressing the influence of roll eccentricities on the control of the rolling stock thickness in a roll stand, the control system providing a dead zone insensitive to signal fluctuations caused by the roll eccentricities, the zone width of which is varied depending on the size of the signal fluctuations.
  • the rolling stock thickness As a controlled variable of interest, cannot be measured in terms of control technology at the point of its origin, namely the roll gap, and therefore cannot be used for the direct correction of faults, such as eccentricities of the rolls, can be used.
  • the rolling force is detected on the basis of this relationship by means of a rolling load detector and used to regulate the thickness of the rolling stock. If the roll gap increases, for example due to an increase in the inlet thickness of the rolling stock, this leads to an increase in the rolling force F W ; This increase is detected, the control position s of the rollers being reduced by the control, so that the rolling force F W is further increased and the rolling stock thickness is regulated back to its target value becomes.
  • the rolling stock thickness h a is not available alone, but only together with the roll eccentricity ⁇ R, which causes a periodic increase and decrease in the rolling force F W during the rolling process.
  • the increases and decreases in the rolling force F W caused by the eccentricities are incorrectly interpreted by the AGC system as an increase or decrease in the roll gap, which means that the rolling force F W is automatically increased or decreased via the setting position s and thus the eccentricities in are rolled into their full extent in the rolling stock.
  • the object of the invention is to optimize the adaptation of the width of the dead zone as a function of the eccentricities that occur.
  • this object is achieved in that, in the method of the type specified at the outset, the zone width is varied as a function of an ongoing statistical evaluation of the signal fluctuations.
  • the zone width is varied as a function of an ongoing statistical evaluation of the signal fluctuations.
  • the standard deviation of the signal fluctuations from their mean value is used to determine the zone width.
  • the standard deviation is used to determine a variable that optimally reflects the current extent of the eccentricity-dependent signal fluctuations for setting the dead zone.
  • the determination of the standard deviation is particularly easy to perform in terms of computation, as a result of which the hardware and software expenditure for implementing this computing function is comparatively low.
  • the values continuously determined for the standard deviation are weighted with a predetermined factor in the order of magnitude of approximately 1 to 4, preferably 2 to 3.
  • the statistical evaluation of the signal fluctuations is based on an observation period that corresponds to the roller circulation period or a multiple thereof. In this way it is taken into account that the signal fluctuations, despite their unpredictable, so correlate statistical nature with the rotation of the roller.
  • the signal fluctuations for their statistical evaluation provide support values with a sampling frequency which is in a fixed ratio to the roller speed. This results in a number of base values independent of the roller speed within the observation period, which makes it possible to predefine a specific computing capacity for the statistical evaluation.
  • signal fluctuations occurring at various points within the control can be used to set the width of the dead zone, provided that they correlate with the roller eccentricities.
  • the signal values applied to the dead zone on the input side are preferably used for statistical evaluation.
  • Fig. 1 shows the block diagram of an AGC (automatic gauge control) control for a roll stand 1 with an upper and lower support roll 2 or 3, two work rolls 4 and 5, a hydraulic adjusting device 7 which can be actuated via a control valve 6, for setting the setting position s and a spring c G simulating the elasticity of the roll stand 1.
  • the rolling stock 8, to which an equivalent material spring c M can be assigned in the roll gap, is rolled down by the two rollers 4 and 5 from an inlet thickness h e to an outlet thickness h a .
  • the roll eccentricities can be described by effectively changing the roll radius ⁇ R.
  • the setting position s is measured with a position sensor 9 on the setting device 7; the support roller speed n is recorded by means of a tachometer 10 on the support roller 3 and the rolling force F W is measured by means of a pressure sensor 11 on the roll stand 1.
  • the measured actual value of the rolling force F W is fed to a matching amplifier 12 which reproduces the stand characteristic curve c G and which on the output side generates the spring-back actual value F W / c G.
  • the summing point 13 is supplied with a value s V * instead of the actual value of the starting position s.
  • the difference signal at the output of summing point 13 thus contains not only the difference ⁇ h between the target value h a * and the actual value h a of the rolling stock thickness, but also signal fluctuations caused by the eccentricities ⁇ R.
  • the difference signal at the output of the summing point 13 is fed with a positive sign directly to another summing point 14, which also has the same difference signal is supplied via a limiter 15 with a negative sign.
  • the limiter 15 transmits from the signal supplied to it only those signal amplitudes which lie within a range x which preferably corresponds to the amplitudes of the eccentricities ⁇ R, so that precisely this amplitude range does not appear at the output of the summing element 14.
  • the limiter 15 thus forms, together with the further summing element 14, a dead zone for all signal amplitudes which lie within the range b.
  • the width b of the dead zone is set so that it is insensitive to the signal fluctuations caused by the roller eccentricities ⁇ R.
  • the setpoint value s * at the output of the correction amplifier 17 is fed back via a delay device 18 with a delay corresponding to the natural time of the position control (position controller 22) as the signal s V * to the summing point 13.
  • the output signal s * of the correction amplifier 17 is supplied with a positive identifier and the output signal of the limiter 15 via a matching amplifier 19 with a negative sign as an additional setpoint ⁇ s * to a further summing point 20, at the output of which a final setpoint for the setting position s * is generated.
  • the additional setpoint value ⁇ s * coming from the limiter 15 and supplied to the summing point 20 via the matching amplifier 19 is used to compensate for the roll eccentricities ⁇ R.
  • the final setpoint for the starting position at the output of the summing point 20 is compared at an additional summing point 21 with the actual value s supplied by the position transmitter 9, the comparison result via a position controller 22 and a downstream actuator 23 for actuating the control valve 6 and thus for adjusting the Position s is used.
  • the difference signal at the output of the summing point 13 is first used to detect 24 support values x i and a device 25 for statistical evaluation of the base values x i supplied.
  • the device 25 over a period of observation of N base values x i their standard deviation ⁇ from the mean value x ⁇ With (1 / N * ⁇ x i 2nd - x ⁇ ⁇ 2nd ) 1/2 determined.
  • the scanning is carried out as a function of the roller speed n.
  • a control pulse generator 26 controlling the scanning element 24 is provided, the output-side control pulse frequency of which is dependent on that with the tachometer 10 measured roller speed n is controlled. Since the observation period on which the statistical evaluation of the signal fluctuations is based consists of a predetermined number of N base values x i , the observation period is also automatically adapted to the respective roller circulation period.
  • the determined value for the standard deviation ⁇ is multiplied in a correction element 28 downstream of the device 25 by a predetermined factor in the range between 2 and 3 before it is sent to a control input 29 of the Limiter 15 for setting the zone width b is supplied.

Claims (6)

  1. Procédé de suppression de l'influence d'excentricités (ΔR) de cylindres sur la régulation de l'épaisseur (ha) de produits laminés dans une cage (1) de laminoir, une zone (14, 15) d'insensibilité à des fluctuations de signaux dues aux excentricités (ΔR) des cylindres, dont on fait varier la largeur (b) de zone en fonction de la grandeur des fluctuations du signal, étant prévue dans la régulation, caractérisé en ce que l'on fait varier la largeur (b) de la zone en fonction d'une exploitation statistique continue des fluctuations du signal.
  2. Procédé suivant la revendication 1, caractérisé en ce qu'on utilise l'écart type (σ) des fluctuations du signal par rapport à sa valeur moyenne (x) pour déterminer la largeur (b) de la zone.
  3. Procédé suivant la revendication 2, caractérisé en ce que l'on pondère les valeurs déterminées en continu pour l'écart type (σ) par un facteur prescrit de l'ordre d'à peu près 1 à 4, de préférence 2 à 3.
  4. Procédé suivant l'une des revendications précédentes, caractérisé en ce que l'exploitation statistique des fluctuations du signal est basée sur un laps de temps d'observation qui correspond à la durée de rotation des cylindres ou à un multiple de celle-ci.
  5. Procédé suivant l'une des revendications précédentes, caractérisé en ce que l'on détecte parmi les fluctuations du signal, pour leur exploitation statistique, des valeurs (xi) d'appui à une fréquence d'échantillonnage, qui est en rapport fixe avec la vitesse (n) de rotation des cylindres.
  6. Procédé suivant l'une des revendications précédentes, caractérisé en ce que l'on utilise, pour l'exploitation statistique, les fluctuations de signal présentes en entrée dans la zone (14, 15) d'insensibilité.
EP93919021A 1992-09-22 1993-09-20 Procede visant a supprimer l'influence qu'exercent les excentricites des rouleaux sur le reglage de l'epaisseur des produits a laminer passes dans une cage de laminoir Expired - Lifetime EP0662017B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4231615A DE4231615A1 (de) 1992-09-22 1992-09-22 Verfahren zum Unterdrücken des Einflusses von Walzenexzentrizitäten auf die Regelung der Walzgutdicke in einem Walzgerüst
DE4231615 1992-09-22
PCT/DE1993/000894 WO1994006578A1 (fr) 1992-09-22 1993-09-20 Procede visant a supprimer l'influence qu'exercent les excentricites des rouleaux sur le reglage de l'epaisseur des produits a laminer passes dans une cage de laminoir

Publications (2)

Publication Number Publication Date
EP0662017A1 EP0662017A1 (fr) 1995-07-12
EP0662017B1 true EP0662017B1 (fr) 1997-01-08

Family

ID=6468488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93919021A Expired - Lifetime EP0662017B1 (fr) 1992-09-22 1993-09-20 Procede visant a supprimer l'influence qu'exercent les excentricites des rouleaux sur le reglage de l'epaisseur des produits a laminer passes dans une cage de laminoir

Country Status (5)

Country Link
US (1) US5600982A (fr)
EP (1) EP0662017B1 (fr)
AT (1) ATE147296T1 (fr)
DE (2) DE4231615A1 (fr)
WO (1) WO1994006578A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59501395D1 (de) * 1994-03-29 1998-03-12 Siemens Ag Verfahren zur Unterdrückung des Einflusses von Walzenexzentrizitäten auf die Regelung der Walzgutdicke in einem Walzgerüst
EP0698427B1 (fr) * 1994-07-28 1997-12-03 Siemens Aktiengesellschaft Procédé pour supprimer l'influence des excentricités de rouleaux de laminage
EP0880598A4 (fr) * 1996-01-23 2005-02-23 Affymetrix Inc Evaluation rapide de difference d'abondance d'acides nucleiques, avec un systeme d'oligonucleotides haute densite
DE19618712B4 (de) * 1996-05-09 2005-07-07 Siemens Ag Regelverfahren für ein Walzgerüst zum Walzen eines Bandes
DE19642918C2 (de) * 1996-10-17 2003-04-24 Siemens Ag System zur Berechnung des Enddickenprofils eines Walzbandes
AT407015B (de) * 1996-12-04 2000-11-27 Voest Alpine Ind Anlagen Verfahren zur kompensation der exzentrizität der stütz- und/oder arbeitswalzen in einem duo- oder quarto-walzgerüst
US5961899A (en) * 1997-07-15 1999-10-05 Lord Corporation Vibration control apparatus and method for calender rolls and the like
DE102006008574A1 (de) * 2006-02-22 2007-08-30 Siemens Ag Verfahren zur Unterdrückung des Einflusses von Walzenexzentrizitäten
DE102007003243A1 (de) * 2007-01-23 2008-07-31 Siemens Ag Regelanordnung für ein Walzgerüst und hiermit korrespondierende Gegenstände
CN109670223A (zh) * 2018-12-07 2019-04-23 山西太钢不锈钢股份有限公司 一种立磨磨辊精度定位的方法

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2036965C3 (de) * 1970-07-25 1974-04-18 Siemens Ag, 1000 Berlin U. 8000 Muenchen Anordnung zur betriebsmäßigen Erfassung und Auswertung von durch Exzentrizitäten der Walzen hervorgerufenen Walzkraftschwankungen in einem Walzwerk
DE2643686C3 (de) * 1976-09-28 1980-03-27 Siemens Ag, 1000 Berlin Und 8000 Muenchen Anordnung zur Regelung der Walzgutdicke in einem Walzgerbst
JPS5626612A (en) * 1979-08-06 1981-03-14 Kobe Steel Ltd Controlling method for thickness of rolled sheet
JPS5992113A (ja) * 1982-11-15 1984-05-28 Nisshin Steel Co Ltd ロ−ル偏心制御装置
US4580224A (en) * 1983-08-10 1986-04-01 E. W. Bliss Company, Inc. Method and system for generating an eccentricity compensation signal for gauge control of position control of a rolling mill
US4531392A (en) * 1984-03-19 1985-07-30 Aluminum Company Of America Phase compensator for gauge control using estimate of roll eccentricity
US4648257A (en) * 1985-08-30 1987-03-10 Aluminum Company Of America Rolling mill eccentricity compensation using actual measurement of exit sheet thickness
JPS62127114A (ja) * 1985-11-27 1987-06-09 Mitsubishi Electric Corp 圧延機におけるロ−ル偏心除去装置
JPS62254915A (ja) * 1986-04-30 1987-11-06 Toshiba Corp 多重圧延機のロ−ル偏芯除去制御装置
US4763273A (en) * 1986-07-25 1988-08-09 Kabushiki Kaisha Toshiba Apparatus for detecting eccentricity of roll in rolling mill
DE3935434A1 (de) * 1989-10-25 1991-05-02 Schloemann Siemag Ag Verfahren zur kompensation von durch walzenexzentrizitaeten verursachten stoerungen
SU1696027A1 (ru) * 1989-12-18 1991-12-07 Липецкий Филиал Всесоюзного Научно-Исследовательского И Проектного Института Систем Автоматизации И Управления Способ управлени многоклетевым прокатным станом
JPH03259302A (ja) * 1990-03-09 1991-11-19 Hitachi Ltd 情報処理システム
DE4131765A1 (de) * 1991-09-24 1993-03-25 Siemens Ag Regelparameter-verbesserungsverfahren fuer industrielle anlagen
FR2688428B1 (fr) * 1992-03-13 1996-06-21 Lorraine Laminage Dispositif de commande d'un outil d'ecrouissage par laminage leger d'une tole.
US5341663A (en) * 1992-04-22 1994-08-30 Aluminum Company Of America Automatic process control and noise suppression

Also Published As

Publication number Publication date
DE59305091D1 (de) 1997-02-20
DE4231615A1 (de) 1994-03-24
EP0662017A1 (fr) 1995-07-12
ATE147296T1 (de) 1997-01-15
WO1994006578A1 (fr) 1994-03-31
US5600982A (en) 1997-02-11

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