DE3737328A1 - Method for suppressing the influence of periodically occurring eccentricities of operating and/or supporting rolls - Google Patents

Method for suppressing the influence of periodically occurring eccentricities of operating and/or supporting rolls

Info

Publication number
DE3737328A1
DE3737328A1 DE19873737328 DE3737328A DE3737328A1 DE 3737328 A1 DE3737328 A1 DE 3737328A1 DE 19873737328 DE19873737328 DE 19873737328 DE 3737328 A DE3737328 A DE 3737328A DE 3737328 A1 DE3737328 A1 DE 3737328A1
Authority
DE
Germany
Prior art keywords
revolution
image
eccentricities
operating
influence
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.)
Ceased
Application number
DE19873737328
Other languages
German (de)
Inventor
Guenter Uetz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19873737328 priority Critical patent/DE3737328A1/en
Publication of DE3737328A1 publication Critical patent/DE3737328A1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

The invention relates to a method for suppressing the influence of periodically occurring eccentricities of operating and/or supporting rolls in the rolling force measuring signal of the thickness control when rolling during the bullhead pass. The invention consists in that the circumference of the supporting roll is subdivided into equal sections by equidistant support points (K), the number of support points (K) being dependent on the maximum circumferential speed <IMAGE> and the minimum possible scanning time (tA), in that, during one revolution of the support rolls, each measuring signal picked up at the support points (K) is divided by a computer into a process-describing part <IMAGE> and into an eccentricity-describing part <IMAGE> and is determined by means of a regression analysis, and in that these measuring signals thus obtained are used as a reference value for the thickness control until the operating and supporting rolls have been readjusted. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zum Unterdrücken des Einflusses von periodisch auftretenden Arbeits- und/oder Stützwalzenexzentrizitäten nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for suppressing the influence of periodically occurring work and / or backup roll eccentricities according to the preamble of claim 1.

Beim Walzen auf einer Flachbahn werden immer höhere Anforderungen an die Genauigkeit und Planheit der Walzprodukte gestellt. Dickenregelungen, bei denen die Anstellung der Walzen und die laufende Korrektur mit Hilfe von Meßsignalen vorgenommen werden, sind bereits bekannt (DE-PS 26 05 183). Diese Dickenregelungen sind jedoch noch nicht genau genug, da das Meßsignal durch periodisch auftretende Exzentrizitäten der Arbeits- und/oder Stützwalzen verstärkt ist. Das Meßsignal hat ungefähr Sinusform, doch weicht die gemessene Form des Meßsignals von der Kurvenform ab, und zwar dadurch, daß Abweichungen beiderseits der Kurvenlinie auftreten. Dadurch arbeiten die unterlagerten Regelungen nicht korrekt und können sogar in die falsche Richtung arbeiten. Es hat sich ergeben, daß diese Störungen vor allen Dingen bei Morgellagern mit Keil auftreten, vermutlich verursacht dadurch, daß sich in dem Öllager ein Stau von Zeit zu Zeit bildet und wieder abgebaut wird.When rolling on a flat web, the demands are increasing the accuracy and flatness of the rolled products. Thickness regulations, where the adjustment of the rollers and the ongoing correction with the help of measurement signals are already known (DE-PS 26 05 183). However, these thickness regulations are still not accurate enough because the measurement signal is caused by periodic Eccentricities of the work and / or backup rolls is reinforced. The measurement signal is roughly sinusoidal, but the measured shape deviates of the measurement signal from the curve shape, namely in that deviations occur on both sides of the curve line. That's how they work underlying regulations are not correct and can even be in the wrong Work in the direction. It has been found that these disorders occur all things occur in morning camps with wedges, probably caused in that there is a jam in the oil store from time to time forms and is broken down again.

Die Aufgabe besteht daher darin, bei der Dickenregelung beim Walzen auf der Flachbahn den Einfluß von periodisch auftretenden Arbeits- und/oder Stützwalzenexzentrizitäten im Walzkraftmeßsignal, die periodischen Störungen zu unterdrücken bzw. hinauszuzögern.The task is therefore to control the thickness during rolling the influence of periodically occurring work  and / or backup roll eccentricities in the rolling force measurement signal, the periodic To suppress or delay faults.

Die Aufgabe wird nach der Erfindung durch die in den Patentansprüchen angegebenen Maßnahmen gelöst.The object is achieved according to the invention by the in the claims specified measures solved.

Die Erfindung wird im folgenden an Hand einer Zeichnung an einem Ausführungsbeispiel näher erläutert.The invention is based on a drawing of a Embodiment explained in more detail.

Für den auf R S bezogenen Stützwalzenumfang gilt:The following applies to the back-up roll circumference related to R S

und für den auf R S bezogenen Arbeitswalzenumfang and for the work roll size related to R S

Das heißt, bei einer Stützwalzenumdrehung dreht sich die Arbeitswalze mal.That is, the work roll rotates with one backup roll revolution  times.

Teilt man nun den Stützwalzenumfang in K äquidistante Stützstellen, wobei K abhängig von der maximalen Umfangsgeschwindigkeit und der minimal möglichen Abtastzeit t A ist, so bekommt man über einer Stützwalzenumdrehung K Meßsignale. Das Meßsignal wird nun in einen prozeßbeschreibenden Teil und in einen exzentrizitätsbeschreibenden Teil zerlegt. If the circumference of the support roller is divided into K equidistant support points, where K is dependent on the maximum circumferential speed and the minimum possible sampling time t A , K measurement signals are obtained over one revolution of the support roller. The measurement signal is now broken down into a process-describing part and an eccentricity-describing part.

Aus den K Meßsignalen während der Stützwalzenumdrehung n werden die Koeffizienten a₀, a₁, a₂, b₁, c₁, d₁, e₁ für die n+1-te Stützwalzenumdrehung mittels Regressionsanalyse wie folgt bestimmt:From the K measurement signals during the backup roller revolution n , the coefficients a ₀, a ₁, a ₂, b ₁, c ₁, d ₁, e ₁ for the n + 1th backup roller revolution are determined by means of regression analysis as follows:

FM ist die Filtermatrix, FM -1 die Inversion. FM is the filter matrix, FM -1 is the inversion.

Die Filtermatrix FM und ihre Inverse FM -1 werden nach jedem Walzenwechsel neu bestimmt. Vor der Bestimmung von FM und FM -1 werden für jeden Walzensatz die optimalen Filterbeiwerte f₁, α₁ bestimmt.The filter matrix FM and its inverse FM -1 are redetermined after each roll change. Before determining FM and FM -1 , the optimal filter coefficients f ₁, α ₁ are determined for each set of rollers.

Die Filtergleichung hat dann folgende Form für die n+1 Stützwalzenumdrehung:The filter equation then has the following form for the n +1 backup roller revolution:

mit xε [0,2 π] und t=0 bis Ende der Walzung und a 0₀, a 1₀, a 2₀=0.with x ε [0.2 π ] and t = 0 until the end of the rolling and a 0₀ , a 1₀ , a 2₀ = 0.

Die Vorteile des Verfahrens nach der Erfindung bestehen darin, daß die Störungen durch die Exzentrizitäten der Arbeits- und/oder der Stützwalze auf diese Weise herausgefiltert und vollständig unterdrückt werden können. Dadurch ist das Meßsignal, das als Sollwert der Dickenregelung dient, nunmehr in der Lage, die Dicke und die Planheit des Walzproduktes zu gewährleisten.The advantages of the method according to the invention are that the disturbances caused by the eccentricities of the work and / or the Back-up roller filtered out in this way and completely suppressed can be. This makes the measurement signal the setpoint the thickness control is now able to control the thickness and the To ensure flatness of the rolled product.

Claims (2)

1. Verfahren zum Unterdrücken des Einflusses von periodisch auftretenden Arbeits- und/oder Stützwalzenexzentrizitäten im Walzkraftmeßsignal der Dickenregelung beim Walzen auf der Flachbahn, dadurch gekennzeichnet, daß der Umfang der Stützwalze durch äquidistante Stützstellen (K) in gleiche Abschnitte unterteilt wird, wobei die Anzahl der Stützstellen (K) von der maximalen Umfangsgeschwindigkeit und der minimal möglichen Abtastzeit (t A) abhängig ist, daß während einer Umdrehung der Stützwalzen jedes der an den Stützstellen (K) aufgenommene Meßsignal von einem Rechner in einen prozeßbeschreibenden Teil und in einen exzentrizitätsbeschreibenden Teil zerlegt und während der Umdrehung ihre Koeffizienten für die folgende Umdrehung mittels einer Regressionsanalyse bestimmt wird und daß diese so gewonnenen Meßsignale als Sollwert der Dickenregelung bis zur Neueinstellung der Arbeits- bzw. Stützwalzen verwendet wird. 1. A method for suppressing the influence of periodically occurring work and / or support roller eccentricities in the rolling force measurement signal of the thickness control when rolling on the flat web, characterized in that the circumference of the support roller is divided into equal sections by equidistant support points (K) , the number of Interpolation points (K) depends on the maximum circumferential speed and the minimum possible sampling time (t A ) that during a revolution of the support rollers each of the measurement signals recorded at the support points (K) is broken down by a computer into a process-describing part and an eccentricity-describing part and during the revolution, its coefficients for the following revolution are determined by means of a regression analysis and that the measurement signals thus obtained are used as the setpoint value for the thickness control until the work or back-up rolls are readjusted. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zur Regressionsanalyse es folgende Matrix gibt: 2. The method according to claim 1, characterized in that there is the following matrix for regression analysis:
DE19873737328 1987-10-30 1987-10-30 Method for suppressing the influence of periodically occurring eccentricities of operating and/or supporting rolls Ceased DE3737328A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19873737328 DE3737328A1 (en) 1987-10-30 1987-10-30 Method for suppressing the influence of periodically occurring eccentricities of operating and/or supporting rolls

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873737328 DE3737328A1 (en) 1987-10-30 1987-10-30 Method for suppressing the influence of periodically occurring eccentricities of operating and/or supporting rolls

Publications (1)

Publication Number Publication Date
DE3737328A1 true DE3737328A1 (en) 1989-05-11

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DE19873737328 Ceased DE3737328A1 (en) 1987-10-30 1987-10-30 Method for suppressing the influence of periodically occurring eccentricities of operating and/or supporting rolls

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT407015B (en) * 1996-12-04 2000-11-27 Voest Alpine Ind Anlagen METHOD FOR COMPENSATING THE ECCENTRICITY OF THE SUPPORT AND / OR WORK ROLLS IN A DUO OR QUARTO ROLLING STAND

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2706449A1 (en) * 1976-08-31 1978-03-02 Ishikawajima Harima Heavy Ind PROCESS FOR ELIMINATING OR COMPENSATING THE INFLUENCE OF ROLL ECENTRICITIES IN ROLLING STANDS
DE3423656A1 (en) * 1983-08-10 1985-02-21 E.W. Bliss Co. Inc., Salem, Ohio METHOD AND DEVICE FOR GENERATING A SIGNAL FOR EXCENTRICITY COMPENSATION FOR MEASURING OR POSITION CONTROL IN A ROLLING DEVICE OF A ROLLING MILL OR THE LIKE.
DE2605183C2 (en) * 1975-02-12 1987-03-05 Hitachi, Ltd., Tokio/Tokyo, Jp

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2605183C2 (en) * 1975-02-12 1987-03-05 Hitachi, Ltd., Tokio/Tokyo, Jp
DE2706449A1 (en) * 1976-08-31 1978-03-02 Ishikawajima Harima Heavy Ind PROCESS FOR ELIMINATING OR COMPENSATING THE INFLUENCE OF ROLL ECENTRICITIES IN ROLLING STANDS
DE3423656A1 (en) * 1983-08-10 1985-02-21 E.W. Bliss Co. Inc., Salem, Ohio METHOD AND DEVICE FOR GENERATING A SIGNAL FOR EXCENTRICITY COMPENSATION FOR MEASURING OR POSITION CONTROL IN A ROLLING DEVICE OF A ROLLING MILL OR THE LIKE.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT407015B (en) * 1996-12-04 2000-11-27 Voest Alpine Ind Anlagen METHOD FOR COMPENSATING THE ECCENTRICITY OF THE SUPPORT AND / OR WORK ROLLS IN A DUO OR QUARTO ROLLING STAND

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