EP0108379A2 - Procédé et commande pour régler la distribution de l'effort de traction pendant le laminage à froid de bandes - Google Patents

Procédé et commande pour régler la distribution de l'effort de traction pendant le laminage à froid de bandes Download PDF

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Publication number
EP0108379A2
EP0108379A2 EP83110911A EP83110911A EP0108379A2 EP 0108379 A2 EP0108379 A2 EP 0108379A2 EP 83110911 A EP83110911 A EP 83110911A EP 83110911 A EP83110911 A EP 83110911A EP 0108379 A2 EP0108379 A2 EP 0108379A2
Authority
EP
European Patent Office
Prior art keywords
distribution
rolling
tension
actuators
inlet
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.)
Granted
Application number
EP83110911A
Other languages
German (de)
English (en)
Other versions
EP0108379A3 (en
EP0108379B1 (fr
Inventor
Eberhard Dr.-Ing. Neuschütz
Bernd Dr.-Ing. Berger
Gert Dipl.-Ing. Mücke
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.)
BFI VDEH Institut fuer Angewandte Forschung GmbH
Original Assignee
BFI VDEH Institut fuer Angewandte Forschung 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 BFI VDEH Institut fuer Angewandte Forschung GmbH filed Critical BFI VDEH Institut fuer Angewandte Forschung GmbH
Publication of EP0108379A2 publication Critical patent/EP0108379A2/fr
Publication of EP0108379A3 publication Critical patent/EP0108379A3/de
Application granted granted Critical
Publication of EP0108379B1 publication Critical patent/EP0108379B1/fr
Expired legal-status Critical Current

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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
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/36—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by cold-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/14—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories having counter-pressure devices acting on rolls to inhibit deflection of same under load; Back-up rolls
    • B21B13/147—Cluster mills, e.g. Sendzimir mills, Rohn mills, i.e. each work roll being supported by two rolls only arranged symmetrically with respect to the plane passing through the working rolls

Definitions

  • the invention relates to a method for regulating the tension distribution during cold rolling of strips, wherein for the measurement of the tension distribution on at least one side of a roll stand tension sensors spaced in the axial direction and for the adjustment of the tension distribution a controller and dependent in the axial direction of the work rolls differentially acting actuators are provided for the roll gap.
  • the invention relates to a control circuit for carrying out this method and to an expedient embodiment of a rolling mill for regulating the tension distribution mentioned.
  • the tensile stress distribution can be changed in a known manner by influencing the roll gap differently over the bandwidth by means of suitable actuators.
  • a different deflection of the work rolls can be achieved by positively or negatively bracing the roll journals of opposing rolls. This essentially enables the setting of curved roll gaps and a corresponding course of the tension distribution.
  • a linear change in the roll gap can be brought about across the width.
  • Locally differentiated changes can be achieved by means of a thermal control in which support and / or work rolls are cooled or heated. Hollow rolls can be changed in their bombage by "pumping up", whereby their cavities are placed under different tensions.
  • a method for determining the tensile stress distribution during cold rolling is described in "Stahl und Eisen", 1977, pages 1029/1031.
  • a deflecting measuring roller with axially spaced tension sensors is used to record the tension distribution as a measure of length deviations and thus flatness in a three-stand cold rolling mill between the last rolling stand and the tension rollers.
  • the invention has for its object to provide a method of the type described in the introduction as well as a control circuit and a rolling mill in such a way that malfunctions during rolling are avoided.
  • the conditions of the flatness of the rolling stock should also be observed. Furthermore, it should be possible to achieve trouble-free rolling with high degrees of deformation through high tensile stresses.
  • the proposal according to the method according to the invention is that the regulators are used to set the actuators according to a position at which the difference between the tensile stress during the entry and the exit is kept as constant as possible and below a maximum value above the roll width a folding jam occurs during rolling.
  • the proposed position specification of the actuators derat that the differences in tensile stresses at the inlet and at the outlet over the rolling width are kept as constant as possible and below a maximum value above which a folding jam occurs during rolling enables a largely trouble-free rolling. Under the condition of the aforementioned proposal, a uniform and stable material flow can be achieved across the roll width. As well as a backlog of material and material folding give the scaffold inlet, the tensile stress is changed with the proviso that the mentioned difference between the framework inlet and scaffolding discharge is made more uniform across the strip width, this being done so far, that a ß mentioned folding congestion phenomena are avoided, In this case, it follows that only limited variations in the Tension difference may exist.
  • a distribution of the tensile stress is therefore first measured at the outlet by means of the tension transducers spaced apart in the axial direction of the rollers.
  • the difference to the inlet tension distribution is either determined by tension sensors located on the inlet side of the roll stand and spaced apart in the axial direction, or determined in the case of reversing roll stands on the basis of stored measured values which were measured and stored in the previous rolling phase.
  • the method proposed by the characterizing part according to claim 1 can suitably adapt the operating conditions within wide limits.
  • the roll gap can be continuously detected by means of suitable measuring sensors, for example optical devices, and the measured values can be introduced into a control loop in which the actuators are changed by corresponding amounts that the elastic deformations are compensated.
  • suitable measuring sensors for example optical devices
  • the measured values can be introduced into a control loop in which the actuators are changed by corresponding amounts that the elastic deformations are compensated.
  • this requires additional measuring and computing devices.
  • an auxiliary control loop can therefore be provided for the control loop, to which the actuator positions themselves are traced.
  • the tensile stress measurements to be carried out in connection with the invention can expediently be obtained on a deflecting measuring roller which has axially spaced tension sensors. This allows, if necessary in connection with a measuring roller on the other side of the roll stand or with a memory, both the measurements for the determination of the congestion of folds, the flatness of the strip and finally also the elastic roll deformation.
  • the material thickness, the tensile forces and the force distribution q at the inlet and outlet of the roll stand and the bandwidth and the strip position are only taken into account at the outlet of the roll stand for the position specification.
  • a control loop is suitable for carrying out the proposed method, in which the tensile force distribution existing at the outlet is fed back as control variables to the controller, and in which an auxiliary control loop is also provided for setting the axially spaced actuators, to which the actuator positions are traced. With such a control loop, the actuators can be acted on practically without dead time.
  • a measured tension distribution at the inlet is used to specify a target function of the tension distribution at the outlet.
  • the latter is used in conjunction with a measured thickness profile of the incoming strip to determine the position of the actuators.
  • the presetting part is expediently connected to the auxiliary control circuit during the rolling after the control for the precontrol part has been inserted, only the changes on the inlet side of the thickness profile, the tensile force distribution, the strip position and the strip width being taken into account in each case.
  • the method according to the invention is fundamentally possible in any rolling mill in which a differentiated action can be exerted on the roll gap in the axial direction.
  • the application is particularly advantageous this method in the case of a reversible roll stand with supported work rolls arranged between the brake reel and the drive reel which can be switched over upon reservation.
  • a deflecting measuring roller having the axially spaced measuring transducers is only required on one side of the rolling stand if the measured values are transmitted to the controller in the rolling phase in which the measuring roller is located at the outlet of the rolling stand and in the following phase in which After reversing, the measuring roller is located at the inlet of the roll stand, and is transferred to the pilot part for the tension distribution on the outlet side. You then save both the space and the effort for a second deflecting measuring roller or the like.
  • the effect on the contour of the roll gap is particularly effective in a multi-roll stand, the support rolls of which are axially spaced apart and can be adjusted separately.
  • the strip 1 recognizable in cross section is deformed by the work rolls 2.
  • the work rolls 2 are fixed in position by conical rolls 3.
  • the latter are in turn supported by the intermediate rollers 4, which can be adjusted using the support rollers 5.
  • the support rollers 5 are each provided with a support saddle 6, as can also be seen in FIG. 2.
  • the eccentrics 7 for the bearing of each support roller 5 are adjustable so that the bearing axes 8 can be adjusted. This makes it possible to adjust the support rollers 5 in the direction of the double arrows 9. They thus act in an axially differentiated manner on the intermediate rolls 4, which in turn change the roll gap between the work rolls 2 via the cone rolls 3.
  • FIG. 3 The basic course of the method according to the invention is illustrated in FIG. 3.
  • the rolling stand 10 can be seen, which is shown schematically as a reversible four-high stand.
  • the strip In the rolling phase shown, the strip is rolled in the direction of arrow 11.
  • the tension sensors which are spaced apart in the axial direction, are realized in the outlet on the deflecting measuring roller 12, which corresponds to the deflecting measuring roller 12 'in the inlet.
  • the strip 1 is subject to the tensile force distribution defined by the drive reel 13, the brake reel 14 and the specification of the roll gap. From this, the tension distribution is calculated, for which a target specification is determined, on the basis of which the controller influences the actuators of the rolling mill, as can be seen from the left part of FIG. 3.
  • the right part illustrates the addition of the procedure through presetting and feedforward control.
  • FIG. 4 shows, over the bandwidth x, the course 6 of the tension distribution, which in this case is lower in the middle than at the edges. If, however, in the mentioned Pilot control 20 and in the calculation of the target voltage distribution 21 is taken into account.
  • the output of the calculation of the target voltage distribution leads to the presetting 22 in order to lead from there together with the precontrol 20 to the setting of the actuator positions 24.
  • the setting of the actuator positions 24 is also carried out on the basis of a control 25, to the input of which the calculation of the target voltage distribution 26 leads on the basis of the measurement on the outlet side of the tensile force distribution by means of the measuring roller 12.
  • FIG. 6 the presetting of the tensile stress distribution is formed in an analogous manner to the regulation of the tensile stress distribution, FIG. 6 additionally showing the possibility of storing the actual values, which can be used when one wants to record the change in band position and bandwidth .
  • FIG. 6 also shows blocks that are not shown in FIG. 3 for reasons of clarity.
  • FIG. 6 shows that the calculation of the soil tension distribution 26 is preceded by the calculation of the actual tension distribution 27 at the inlet, which is not only fed the tensile force distribution of the inlet, but also the measurement of the thickness profile 22 of the inlet.
  • the calculation of the target tension distribution 21 continues to measure the rolling force 28, furthermore the calculation of the actual tension distribution, the actual bandwidth and the actual strip position derived from block 29.
  • the thickness in the outlet 30 and the tensile force distribution in the outlet 31 are supplied to this block 29 as measured values.
  • the actual values formed in block 29 can be stored in memory 32, from where the calculation of the change in bandwidth and band position 33 can be applied directly if, as mentioned, the band position and band width change are to be recorded. Otherwise, the output of the calculation of the actual values in block 29 is used to calculate the target-actual difference of the voltage distribution 34, to which the calculation of the target voltage distribution 21 is also switched, and which in turn is used to calculate the change in bandwidth and band position 33 acted upon. This is followed by the calculation of the change in thickness profile at the outlet through material spreading 35, which is followed by the calculation of the actuator adjustment amounts 36. This is followed by the calculation and finally the setting of the actuator positions 37, which closes the control loop.
  • the presetting part of the control circuit is shown in more detail in FIG.
  • the target tension distribution at the outlet 21 are supplied with the tensile force of the outlet 38 and the thickness of the outlet 39 as well as the tensile force distribution, bandwidth and band position of the inlet and the rolling force 28 recorded with the measuring roller 12 '.
  • the output of the calculation of the target tension distribution in the outlet leads to the calculation of the change in thickness profile at the outlet through material spreading 40, for which the calculation of the thickness profile at the outlet with constant volume 41 is taken into account on the basis of the thickness profile measurement 22 in the inlet.
  • the calculation of the thickness profile changes at the outlet by material spreading in block 40 leads to the calculation of the actuator target positions 42 and finally to the adjustment of the actuator positions 43, which closes the control loop.
  • the target distribution of the tensile stress at the outlet can be determined, which, taking into account the thickness profile with constant volume and the change in thickness profile due to material spreading, enables the position specification of the actuators to be calculated.
  • the auxiliary control loop shown in FIG. 7 serves to take these values into account for setting the actuator positions, in which the set positions are returned. In this way, the dead time can be practically switched off, so that the control loop responds to even very short-term operational changes with sufficient accuracy by adjusting the actuators to the precise dimensions.
  • the pilot control part according to FIG. 8 allows the aforementioned changes to be taken into account. Basically, the same organs are used as for the pilot control part of FIG. 7 and the control circuit of FIG. 6, so that this advantageous embodiment of the invention requires only an insignificant additional effort.
  • the calculation of the actual tension distribution, the actual bandwidth and the actual belt position at the inlet 44 are the tensile force distribution of the inlet based on the measurement with the measuring roller 12 ', and also the thickness in the inlet 50 and fed the strip thickness in the outlet 46.
  • the actual values calculated in block 44 can be stored in memory 45 and used from there or also directly for calculating the change in voltage distribution, bandwidth and band position 46.
  • the output of block 46 together with the thickness profile measurement 22 in the inlet leads to storage of the actual thickness profile 47 and also for calculating the change in thickness profile for the inlet and outlet 48.
  • the latter calculation 48, together with the rolling force 28 leads to the calculation of the change in thickness profile at the outlet through material spreading 40 and from there to the calculation of the actuator adjustment amounts 36, and on the basis This calculation 36 results in the calculation and setting of the actuator positions 37, which also closes this control loop.
  • FIG. 4 shows the course ⁇ A of the tensile stress distribution over the bandwidth x, which in this case is lower in the middle than at the edges. Unless the tape are, however, in the manner mentioned edge cracks to get, and will be provided further rolled with the greatest deformation and tension, the course would have six. be reversed.
  • the lower dashed line shows the tension curve 6E inlet. It is assumed that a congestion needs to be cleared. While the depicted state now shows different courses of ⁇ as the difference between the tension distribution in the inlet versus the tension distribution in the outlet, it would be necessary to correct the congestion of the fold by changing the tension distribution in the outlet so that it corresponds to the dash-dotted curve in the limit. This borderline case shows in which direction the control measure must run. In practice, it will not always be necessary to adjust the difference completely, since a certain maximum value of the difference in the tension distributions can be allowed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
EP19830110911 1982-11-03 1983-11-02 Procédé et commande pour régler la distribution de l'effort de traction pendant le laminage à froid de bandes Expired EP0108379B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3240602 1982-11-03
DE19823240602 DE3240602A1 (de) 1982-11-03 1982-11-03 Verfahren zum regeln der zugspannungsverteilung beim kaltwalzen von baendern

Publications (3)

Publication Number Publication Date
EP0108379A2 true EP0108379A2 (fr) 1984-05-16
EP0108379A3 EP0108379A3 (en) 1986-01-15
EP0108379B1 EP0108379B1 (fr) 1989-08-02

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EP19830110911 Expired EP0108379B1 (fr) 1982-11-03 1983-11-02 Procédé et commande pour régler la distribution de l'effort de traction pendant le laminage à froid de bandes

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EP (1) EP0108379B1 (fr)
JP (1) JPS59130615A (fr)
DE (1) DE3240602A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0173045A1 (fr) * 1984-08-16 1986-03-05 MANNESMANN Aktiengesellschaft Commande de la planéité pour cages de cylindres à feuillards
WO1991018688A1 (fr) * 1990-06-05 1991-12-12 Mannesmann Ag Procede de fabrication d'un feuillard a faible contrainte interne par laminage
WO2006042606A1 (fr) * 2004-10-13 2006-04-27 Siemens Vai Metals Technologies Gmbh & Co Procede et dispositif de production continue d'une fine bande metallique
US7849722B2 (en) 2006-03-08 2010-12-14 Nucor Corporation Method and plant for integrated monitoring and control of strip flatness and strip profile
US8205474B2 (en) 2006-03-08 2012-06-26 Nucor Corporation Method and plant for integrated monitoring and control of strip flatness and strip profile
CN104646431A (zh) * 2015-03-05 2015-05-27 北京科技大学 一种消除双机架铝冷连轧机组负荷漂移的控制方法
CN113083907A (zh) * 2021-03-29 2021-07-09 广西北港不锈钢有限公司 一种不锈钢板材偏心轧制线计算方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3823202A1 (de) * 1988-07-08 1990-01-11 Betr Forsch Inst Angew Forsch Verfahren zum kaltwalzen von blechen und baendern
DE4413913C2 (de) * 1993-04-30 1998-10-15 Krupp Hoesch Stahl Ag Verfahren zum Verhindern eines Faltungsstaus beim Walzen von Metallband
DE102008015828A1 (de) 2007-09-26 2009-04-02 Sms Demag Ag Walzvorrichtung und Verfahren für deren Betrieb
DE102020205120A1 (de) * 2020-04-22 2021-10-28 Sms Group Gmbh Verfahren zum Betreiben einer Metallbandbearbeitungsanlage sowie Metallbandbearbeitungsanlage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315506A (en) * 1964-01-09 1967-04-25 Westinghouse Electric Corp Workpiece tension and shape control method and apparatus
FR2375920A1 (fr) * 1976-12-28 1978-07-28 Voest Ag Dispositif pour laminer des produits laminables en bande ou en feuilles distinctes
GB2017974A (en) * 1978-03-31 1979-10-10 Loewy Robertson Eng Co Ltd Automatic control of rolling

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5467549A (en) * 1977-11-09 1979-05-31 Mitsubishi Electric Corp Shape controll of rolled material
JPS5542143A (en) * 1978-09-19 1980-03-25 Nippon Steel Corp Shape control method of strip
SE446952B (sv) * 1980-04-25 1986-10-20 Asea Ab Regleranordning vid band- eller platvalsverk
DE3020669C2 (de) * 1980-05-30 1984-02-16 Küsters, Eduard, 4150 Krefeld Verfahren zur Steuerung der Liniendruckverteilung in einem Kalander sowie ensprechender Kalander

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3315506A (en) * 1964-01-09 1967-04-25 Westinghouse Electric Corp Workpiece tension and shape control method and apparatus
FR2375920A1 (fr) * 1976-12-28 1978-07-28 Voest Ag Dispositif pour laminer des produits laminables en bande ou en feuilles distinctes
GB2017974A (en) * 1978-03-31 1979-10-10 Loewy Robertson Eng Co Ltd Automatic control of rolling

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IRON & STEEL ENGINEER, Band 56, Nr. 6, Juni 1979, Seiten 55-60; A. NILSSON: "Automatic flatness control system for cold rolling mills" *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0173045A1 (fr) * 1984-08-16 1986-03-05 MANNESMANN Aktiengesellschaft Commande de la planéité pour cages de cylindres à feuillards
WO1991018688A1 (fr) * 1990-06-05 1991-12-12 Mannesmann Ag Procede de fabrication d'un feuillard a faible contrainte interne par laminage
US5365761A (en) * 1990-06-05 1994-11-22 Mannesmann Aktiengesellschaft Method for the production of low-residual-stress rolled strip
WO2006042606A1 (fr) * 2004-10-13 2006-04-27 Siemens Vai Metals Technologies Gmbh & Co Procede et dispositif de production continue d'une fine bande metallique
US7963136B2 (en) 2004-10-13 2011-06-21 Siemens Vai Metals Technologies Gmbh & Co Process and apparatus for the continuous production of a thin metal strip
AT501314B1 (de) * 2004-10-13 2012-03-15 Voest Alpine Ind Anlagen Verfahren und vorrichtung zum kontinuierlichen herstellen eines dünnen metallbandes
TWI418420B (zh) * 2004-10-13 2013-12-11 Siemens Vai Metals Tech Gmbh 用於薄金屬條帶之連續生產之程序與設備
US7849722B2 (en) 2006-03-08 2010-12-14 Nucor Corporation Method and plant for integrated monitoring and control of strip flatness and strip profile
US8205474B2 (en) 2006-03-08 2012-06-26 Nucor Corporation Method and plant for integrated monitoring and control of strip flatness and strip profile
US8365562B2 (en) * 2006-03-08 2013-02-05 Nucor Corporation Method and plant for integrated monitoring and control of strip flatness and strip profile
CN104646431A (zh) * 2015-03-05 2015-05-27 北京科技大学 一种消除双机架铝冷连轧机组负荷漂移的控制方法
CN113083907A (zh) * 2021-03-29 2021-07-09 广西北港不锈钢有限公司 一种不锈钢板材偏心轧制线计算方法

Also Published As

Publication number Publication date
DE3240602C2 (fr) 1993-06-09
EP0108379A3 (en) 1986-01-15
DE3240602A1 (de) 1984-06-14
EP0108379B1 (fr) 1989-08-02
JPS59130615A (ja) 1984-07-27

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