EP0953384A2 - Procédé pour améliorer le contour et pour augmenter la longueur d'un matériau laminé - Google Patents

Procédé pour améliorer le contour et pour augmenter la longueur d'un matériau laminé Download PDF

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Publication number
EP0953384A2
EP0953384A2 EP99107735A EP99107735A EP0953384A2 EP 0953384 A2 EP0953384 A2 EP 0953384A2 EP 99107735 A EP99107735 A EP 99107735A EP 99107735 A EP99107735 A EP 99107735A EP 0953384 A2 EP0953384 A2 EP 0953384A2
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EP
European Patent Office
Prior art keywords
rolling
roll
contour
optimization
contours
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.)
Withdrawn
Application number
EP99107735A
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German (de)
English (en)
Other versions
EP0953384A3 (fr
Inventor
Rudolf Dipl.-Ing. Pichler
Franz Dipl.-Ing. Holy
Sonja Dipl.-Ing. Tichy
Alois Dipl.-Ing. Seilinger
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.)
Primetals Technologies Austria GmbH
Original Assignee
Voest Alpine Industrienlagenbau 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 Voest Alpine Industrienlagenbau GmbH filed Critical Voest Alpine Industrienlagenbau GmbH
Publication of EP0953384A2 publication Critical patent/EP0953384A2/fr
Publication of EP0953384A3 publication Critical patent/EP0953384A3/fr
Withdrawn legal-status Critical Current

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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
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/40—Control of flatness or profile during rolling of strip, sheets or plates using axial shifting of the rolls

Definitions

  • the invention relates to a method for improving the contour of rolled material and to increase the rolled length of material in a rolling program or Freier design of the same with regard to the width sequence of the bands axial displacement of work rolls from at least one roll stand in Warmoder Cold rolling plants depending on a quality criterion in the form of a mathematical Function that is optimized.
  • the contour of the work rolls is inside of a rolling program that covers the rolling processes between two work roll changes includes, subject to constant changes. This is how the work rolls wear out particularly strong at the edge of the rolling stock. These changes in the Contour is taken into account by axially shifting the work rolls.
  • EP 0 219 844 B1 describes a method for adjusting the profile of rolling stock by axially adjusting the positions of an upper and lower work roll in opposite directions Directions known. A determination is made during rolling the profile of each work roll and from this the gap between the work rolls as a function of the size of a relative adjustment of the roller layers to subsequently to determine the size of the adjustment of the roller layers, which for the Gap within the contact area between workpiece and work rolls configuration as smooth as possible in the axial direction. With this document only the following shift position is calculated.
  • EP 0 618 020 A1 shows a method for reaching a predetermined target contour of a rolled strip, with at least two to achieve this target contour Roll stands of a hot strip mill or, if there are at least two passes, in a reversing stand different actuators can be used. With one of the The mechanical actuators become the target contour deviating from the strip profile shape used that there is a minimal deviation of the calculated strip shape results from the target contour. The optimization of the belt contour is in each case for a tape revealed.
  • DE 37 12 043 A1 shows a control device in which, based on an analysis of the current band profile u. a. an optimal axial displacement axially displaceable Rolls to achieve a tension-free hot strip is tracked.
  • the de 40 40 360 A1 shows a control concept for the volume that is currently being processed, whereby certain model equations and actuators adapted based on measured variables become.
  • the object of the present invention is to develop a method which is the increase in the length of the rolled material in a rolling program, i.e. between two work roll changes, as well as the freer design of rolling plans (SFR- "Schedule Free Rolling"), in particular an alternating increase and decrease the width of the rolling stock, and a corresponding contour of the rolling stock is achieved in that for each piece of rolling stock in the rolling program over the whole Width of the piece of rolling stock as smooth a contour of the work rolls or roll gap thus formed is reached.
  • contour defects e.g. "High Spots "- local increases in the band - due to excessively worn locally Work rolls
  • the invention is characterized in that one for at least one roll stand Quality criterion is created that relates to at least a section of the rolling program, which involves multiple rolling operations is applied, and that due to the optimization of the quality criterion the respective roll displacements for everyone Rolling operations of the section under consideration can be predetermined.
  • a rolling process is understood here to mean the process in which a piece of rolled material is processed in a roll stand between the rolls.
  • the quality criterion is an overall target function that is formed by summing individual target functions, with at least one target function being created for each rolling process of a piece of rolled material in the section of the rolling program under consideration. Due to the overall target function, several or all pieces of rolled material can be taken into account for the quality criterion.
  • the quality of individual pieces of rolled material, such as strips, is not evaluated and optimized sequentially, but rather the quality of the entire rolling program or a section of the rolling program. It is usually sufficient to create a target function for each rolling process that evaluates the properties of the rolls either before, during or after the rolling process.
  • the target function is created from the respective roll contours or from the roll gap contour formed thereby. This ensures that the target function is created on the basis of the property of the rolls, namely the roll contours, which causes the contour of the rolling stock.
  • the target function is created, for example, after each rolling process relating to a rolling stock - taking into account the roll displacement - based on the current rolling contours at least across the width of the rolling stock and contains, for example, sums or integrals over squared derivatives or difference quotients or over square deviations of the rolling contours from a target contour, an average or a regressed contour.
  • the roller contours can be determined from models.
  • the model can determine which influences on the rollers are taken into account.
  • Roll contour is to be understood here to mean the contour that results from taking into account all the influences listed below or partial quantities thereof. If, for example, only the roll wear is taken into account, then only the wear contours of the two rolls are considered without deflection, flattening and thermal roll crowning.
  • the quality of these roller contours across the width of the rolling stock and thus the quality of the shift strategy is described by the target function, which is then maximized while observing certain restrictions or minimized when evaluating the anomalies of the rollers.
  • a process model can also serve as a model, in which the properties of the rolling stock, such as stress distribution or material flow, are included.
  • roller contours or the roll gap contour is taken into account at least one of the following influences: the Roll wear, the respective roll grinding, the thermal roll crown, the Roll deformation due to rolling force and roll bending, the variable roll displacements, based on special procedures for profile and flatness control (e.g. using the CVC method).
  • the target function is determined over the entire width of the work rolls. This is particularly important when considering a section of the rolling program, since the further course of the rolling program is not taken into account and a correspondingly smooth contour of the rolls must also be given in the event of narrower or wider pieces of rolling stock following. If the optimization is carried out sequentially over sections of the rolling program, the evaluation of the roll contours or the nip contour can take place, for example, after each rolling process across the entire width of the rolls or the nip (not only over the rolling stock area), since the further course of the rolling program follows the section under consideration is not taken into account in the current optimization.
  • the target function is formed over the contact width of the work rolls with the respective piece of rolled material.
  • the roll contours or the gap gap contour is therefore only evaluated over the range, because only this part is relevant for the quality of the current rolling stock and, for example, when optimizing the entire rolling program, all rolling stock pieces are taken into account.
  • the invention provides that the target function is created on the basis of roll contours represented numerically with respect to roll grid points or the roll gap contour resulting therefrom. This represents a generally simpler, in comparison to analytical representations, less time-consuming basis for creating the objective function for the optimization. Some influences are preferably taken into account numerically, such as the thermal roll crown, for which the temperature distribution in the roll is determined by numerical solution of the heat conduction equation .
  • Another feature of the invention is that the overall objective function is subjected to a mathematical optimization. In this way, the suitable displacements of the rolls for the rolling operations of the section of the rolling program under consideration or for the entire rolling program can be calculated simply and with the aid of a computer.
  • the mathematical optimization is advantageously carried out using a method from non-linear optimization, for example using an SQP method (Sequential Ouadratic Programming), or a genetic algorithm (Genetic Programming) or a combination thereof.
  • An SQP method is particularly suitable for solving problems with constraints.
  • the genetic algorithm for determining initial values is preferred the roll shift used.
  • the restrictions can also be set individually for each piece of rolling stock depending on the rolling program and the grinding of the roll (e.g. the maximum displacement distance between two strips can be selected according to the rolling break between these or the rolling stock thickness or the stitch duration).
  • a nonlinear, restricted optimization problem is thus obtained, which can advantageously be solved by means of the SQP method.
  • each work roll determines multiple shift positions of the rolls.
  • the corresponding The rolls are then shifted during the rolling process from one for the respective roller by optimizing the shift positions or the Move function determined position to the next.
  • the respective Fig. A shows a diagram of the difference between the maximum and minimum Total wear of the upper and lower work roll over the respective bandwidth.
  • the difference between the maximum and is on the vertical axis minimal total wear of both rollers in micrometers over the respective bandwidth shown, on the horizontal axis is the respective volume number for all Bands of the rolling program specified.
  • the wear starts radially to the roller measured from the contour of the newly ground roller and refers to the radius.
  • a slight difference is a sign of a smooth contour of the roller.
  • FIG. B shows a diagram of the empty roll gap contour of the roll gap, the is formed by the two work rolls after the rolling program has ended.
  • the deviation of the roll gap contour from that is on the vertical axis of the new rollers in micrometers, which corresponds to the horizontal axis the roll longitudinal axis.
  • the wear is radial to the rollers starting from the Contour of the newly ground rollers measured.
  • the respective Fig. C shows a diagram of the displacement positions of a roller.
  • the displacement positions in millimeters of the lower one on the vertical axis Roll for each band of the rolling program is shown on the horizontal axis the respective strip number is given for all strips in the rolling program.
  • the starting position the roller corresponds to the displacement position 0 mm.
  • Fig. D shows the width distribution of the bands.
  • On the vertical axis is the respective bandwidth in millimeters for those plotted on the horizontal axis Bands specified.
  • Each rolling program comprises 105 strips as rolled pieces.
  • the shift position the upper roller is always a mirror image of that for reasons of symmetry the lower roller with respect to the center of the stand, i.e. the amount of displacement of the Rolling against their unmoved starting position is identical, the sign however different.
  • the rollers were in accordance with the prior art of a cyclical shift subject.
  • the result is a thin solid Curve is shown, the rollers were according to the invention Result of the optimization of the overall target function formed from target functions Z2 by addition shifted, where Z2 here by the sum of the quadratic Deviations of the roll gap contour from the regression line over the roll gap contour was formed.
  • the Roll gap contour evaluated only once for each rolling process, namely after the Rolling process.
  • the evaluation of the roll gap contour or the roll contours can also take place before or during the respective rolling process.
  • it can be from Be an advantage, especially with long strips, the roll gap contour or the roll contours to evaluate several times for a strip during a rolling process, for example once before the rolling process, once during the rolling process and once after the rolling process, since the properties of the rolls, such as the thermal Roll crowning during a longer rolling process and thus the roll contours to change.
  • 1c, 2c and 3c corresponds to the process without displacement of the rollers a horizontal line through the origin.
  • the cyclical shift method is limited to periodically repeating shifts.
  • the invention differs significantly as a result of the optimization according to the invention from the cyclical shift method.
  • the invention can be used both in continuous and reversing operation and for single and multi-stand Roads are used.
  • the work rolls can be any Having a cut, the method also applies in particular to cylindrical or conventionally parabolically ground rollers or rollers with CVC grinding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
EP99107735A 1998-04-29 1999-04-19 Procédé pour améliorer le contour et pour augmenter la longueur d'un matériau laminé Withdrawn EP0953384A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT71598 1998-04-29
AT0071598A AT409229B (de) 1998-04-29 1998-04-29 Verfahren zur verbesserung der kontur gewalzten materials und zur erhöhung der gewalzten materiallänge

Publications (2)

Publication Number Publication Date
EP0953384A2 true EP0953384A2 (fr) 1999-11-03
EP0953384A3 EP0953384A3 (fr) 2002-12-04

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EP99107735A Withdrawn EP0953384A3 (fr) 1998-04-29 1999-04-19 Procédé pour améliorer le contour et pour augmenter la longueur d'un matériau laminé

Country Status (3)

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US (1) US6164103A (fr)
EP (1) EP0953384A3 (fr)
AT (1) AT409229B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1195205A3 (fr) * 2000-10-03 2004-05-26 Alcoa Inc. Système de réglage de laminoir pour le contrôle de profil et de planéité
DE102006051728A1 (de) * 2006-10-30 2008-05-08 Thyssenkrupp Nirosta Gmbh Verfahren und Walzen von Metallbändern, inbesondere von Stahlbändern

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100832985B1 (ko) * 2001-07-13 2008-05-27 주식회사 포스코 정밀도가 높은 판재의 압연방법
AT411434B (de) * 2002-02-27 2004-01-26 Voest Alpine Ind Anlagen Online regelung eines kaltwalz- bzw. dressierprozesses
US20040234379A1 (en) * 2003-05-22 2004-11-25 Nanocoolers, Inc. Direct current magnetohydrodynamic pump configurations
AT500764A1 (de) * 2004-05-19 2006-03-15 Voest Alpine Ind Anlagen Verfahren zur berechnung der geometrischen form von walzgut
DE102010014867A1 (de) * 2009-04-17 2010-11-18 Sms Siemag Ag Verfahren zum Bereitstellen mindestens einer Arbeitswalze zum Walzen eines Walzguts
DE102018212074A1 (de) 2018-07-19 2020-01-23 Sms Group Gmbh Verfahren zum Ermitteln von Stellgrößen für aktive Profil- und Planheitsstellglieder für ein Walzgerüst und von Profil- und Mittenplanheitswerten für warmgewalztes Metallband
DE102019132029A1 (de) * 2019-11-26 2021-05-27 Thyssenkrupp Steel Europe Ag Herstellung eines gewünschten Metallwerkstücks aus einem Metallflachprodukt

Citations (4)

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Publication number Priority date Publication date Assignee Title
DE3712043A1 (de) 1987-04-09 1988-10-27 Schloemann Siemag Ag Walzgeruest mit axial verschiebbaren walzen
EP0219844B1 (fr) 1985-10-21 1991-01-23 Nippon Steel Corporation Méthode de commande de profil d'une tôle pendant le laminage
EP0276743B1 (fr) 1987-01-24 1992-07-29 Hitachi, Ltd. Procédé de laminage à cylindres de travail déplaçables axialement
EP0618020A1 (fr) 1993-03-29 1994-10-05 Sms Schloemann-Siemag Aktiengesellschaft Procédé et dispositif pour laminer d'un feuillard

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JPS5258047A (en) * 1975-11-10 1977-05-13 Hitachi Ltd Method to roll plates
JPH0615082B2 (ja) * 1984-08-17 1994-03-02 三菱電機株式会社 形状制御操作量設定値の決定装置
DE4040360A1 (de) * 1990-12-17 1991-06-27 Siemens Ag Regelung eines mehrgeruestigen warm- und/oder kaltband-walzwerks
KR960010237B1 (ko) * 1992-08-07 1996-07-26 가와사끼 세이데쓰 가부시끼가이샤 엔드리스 열간압연방법
US5448901A (en) * 1994-05-03 1995-09-12 The University Of Toledo Method for controlling axial shifting of rolls
DE4421005B4 (de) * 1994-06-18 2007-09-27 Betriebsforschungsinstitut VDEh - Institut für angewandte Forschung GmbH Vorrichtung zur Steuerung des Walzens
DE19508476A1 (de) * 1995-03-09 1996-09-12 Siemens Ag Leitsystem für eine Anlage der Grundstoff- oder der verarbeitenden Industrie o. ä.
US5796922A (en) * 1996-03-29 1998-08-18 Weber State University Trainable, state-sampled, network controller
DE19719318C2 (de) * 1997-05-08 2003-06-12 Sms Demag Ag Verfahren zur Beeinflussung der Bandkontur im Kantenbereich eines Walzenbandes
JP3826974B2 (ja) * 1997-05-29 2006-09-27 石川島播磨重工業株式会社 熱間タンデム圧延機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0219844B1 (fr) 1985-10-21 1991-01-23 Nippon Steel Corporation Méthode de commande de profil d'une tôle pendant le laminage
EP0276743B1 (fr) 1987-01-24 1992-07-29 Hitachi, Ltd. Procédé de laminage à cylindres de travail déplaçables axialement
DE3712043A1 (de) 1987-04-09 1988-10-27 Schloemann Siemag Ag Walzgeruest mit axial verschiebbaren walzen
EP0618020A1 (fr) 1993-03-29 1994-10-05 Sms Schloemann-Siemag Aktiengesellschaft Procédé et dispositif pour laminer d'un feuillard

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
article K.ECKELSBACH, G. KNEPPE, D. ROSENTHAL: ""Schedule-Free Rolling Stregies", pages: 163 - 171

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1195205A3 (fr) * 2000-10-03 2004-05-26 Alcoa Inc. Système de réglage de laminoir pour le contrôle de profil et de planéité
DE102006051728A1 (de) * 2006-10-30 2008-05-08 Thyssenkrupp Nirosta Gmbh Verfahren und Walzen von Metallbändern, inbesondere von Stahlbändern
DE102006051728B4 (de) * 2006-10-30 2013-11-21 Outokumpu Nirosta Gmbh Verfahren zum Walzen von Metallbändern, inbesondere von Stahlbändern

Also Published As

Publication number Publication date
EP0953384A3 (fr) 2002-12-04
ATA71598A (de) 2001-11-15
US6164103A (en) 2000-12-26
AT409229B (de) 2002-06-25

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