EP0349885A2 - Méthode pour laminer à froid des feuilles et des bandes - Google Patents

Méthode pour laminer à froid des feuilles et des bandes Download PDF

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Publication number
EP0349885A2
EP0349885A2 EP89111664A EP89111664A EP0349885A2 EP 0349885 A2 EP0349885 A2 EP 0349885A2 EP 89111664 A EP89111664 A EP 89111664A EP 89111664 A EP89111664 A EP 89111664A EP 0349885 A2 EP0349885 A2 EP 0349885A2
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EP
European Patent Office
Prior art keywords
actuators
adjustment
paths
flatness
control elements
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
EP89111664A
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German (de)
English (en)
Other versions
EP0349885A3 (fr
EP0349885B1 (fr
Inventor
Bernd Dr.-Ing. Berger
Gert Dipl.-Ing. Mücke
Eberhard Dr.-Ing. Neuschütz
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.)
BETR FORSCH INST ANGEW FORSCH
BFI VDEH Institut fuer Angewandte Forschung GmbH
Original Assignee
BETR FORSCH INST ANGEW FORSCH
BFI VDEH Institut fuer Angewandte Forschung GmbH
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Application filed by BETR FORSCH INST ANGEW FORSCH, BFI VDEH Institut fuer Angewandte Forschung GmbH filed Critical BETR FORSCH INST ANGEW FORSCH
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Publication of EP0349885A3 publication Critical patent/EP0349885A3/fr
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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
    • B21B37/42—Control of flatness or profile during rolling of strip, sheets or plates using a combination of roll bending and axial shifting of the rolls

Definitions

  • the invention relates to a method referred to in the preamble of claim 1.
  • the flatness errors can be counteracted by targeted action on corresponding actuators of the rolling mill, whereby control loops can be implemented with the flatness as a controlled variable.
  • DE-OS 32 40 602.9 provides for regulating the tension distribution during cold rolling of strips on the basis of measurements of the tension distribution to position the actuators for the roll gap in such a way that the differences between the tension during the entry and the exit across the roll width is kept as constant as possible and below a maximum value above which a folding jam occurs during rolling.
  • numerous flatness errors are still not taken into account here, which can be remedied by the action on further actuators.
  • the setting options include
  • Swiveling of the rollers bending of the rollers due to forces on the roller bale, axial displacement of the rollers e.g. the so-called intermediate rolls or through work rolls with different contours, the entanglement of the rolls and the influencing of the roll crowning by cooling or heating on the one hand or by internal pressure of hollow rolls on the other hand.
  • These actuators have a different time behavior, on the basis of which they can reach their default values in different times. For example, the deflection of the rollers can be carried out almost without inertia, so that there is no speed dependence, while an axial displacement of work rolls or of support rolls is speed dependent, because it cannot be carried out with the rolls stationary. This means that deviations that can no longer be compensated for can result with corresponding faults.
  • the invention has for its object to reduce incorrect controls and malfunctions of the rolling process due to different timing behavior of the actuators of the rolling mill.
  • the actuators reach the adjustment at an adapted speed, in which at least partially proportionate adjustment paths lead to the actuators simultaneously reaching their predetermined value.
  • the target / actual deviation is minimized according to the least squares method, as provided in claim 2.
  • the result can be further improved by forming so-called weighting factors when acting on the actuators between the middle and the edge of the band.
  • the weighting factors ⁇ i make it possible to evaluate the target / actual deviations differently across the bandwidth. So z. B. the deviations at the strip edges are rated higher than the deviations in the strip center area.
  • the influencing functions P1 (x i ), P2 (x i ), .... the actuators can be any functions.
  • the resulting adjustment amounts are carried out so that the ratio of the calculated adjustment paths V1, V2, .... remains constant even during the adjustment. This avoids critical tension distributions in the strip and disruptions in the rolling process.
  • the influencing factors P1, R2 ... are generally familiar to the person skilled in the art.
  • the effects of the actuators depend on the respective travel. Since the constructions differ from scaffold type to scaffold type, it is necessary to experimentally record these effects by empirically examining them individually. Once such an effect function has been recorded, it can be specified in order to assume a position intended in a computer.
  • the adjustment ranges assigned to each actuator can be defined in particular in path units. If the calculated adjustment is added to the actual position of an actuator, this can lead to a target position lying outside the adjustment range being reached. In contrast, the possible adjustment range only extends from the actual position to the range limit of the actuator. Therefore, according to the invention, only the ratio of the possible adjustment value to the calculated adjustment value is formed for all actuators. The remaining ratio values of the other actuators are multiplied by the smallest ratio value, including the actuator which has the smallest travel. This ensures that the ratio of the calculated adjustment paths for the individual actuators to one another is retained even if an individual actuator has reached its range limit.
  • the slowest actuator is decisive for the procedure described so far, so that relatively long adjustment times are necessary to achieve a result. The dead times would be extended accordingly.
  • a modification of the invention according to claim 5 is used. Accordingly, the minimization can be carried out in two steps, the first step being the includes faster actuators. On the basis of these default values, the travel ranges that can be traveled by the fast actuators taking into account the restrictions are first calculated. This calculation result is then decisive in order to carry out a further calculation with the slower links. The slow links were therefore not taken into account in the first calculation. For the calculation of the slower actuators, a numerical deviation is specified, which does not correspond to the measured one, but to that which resulted from the calculation with the fastest actuators. The effect of the fast actuators is already taken into account when the slow actuators are calculated.
  • the above-mentioned embodiment of the invention therefore does not relate to the entire adjustment time, but only to a part thereof, as is permitted according to the basic principle of the invention.
  • the advantage is that the fast actuators can already be used to correct flatness problems if possible.
  • the next section of the travel of the faster elements is then covered at a different speed, which is obtained by extending the combination to the slower actuators in the proposed manner.
  • all actuators execute their actuating paths in a matching time. In this case, the proposed minimization takes place in groups, with fast and slow actuators forming different groups.
  • a reversing 20-roll stand is to be controlled according to FIG. 1 with a larger number of actuators of the type described that a strip with controlled length differences ⁇ L / L can be rolled.
  • actuators 3 arranged at axial intervals on the support rollers 2 and an actuator 5 acting on the axial position of conical rollers 4 are provided.
  • a controller 6 determines the default values with which the actuator 5 on the one hand and the actuators 4 on the other hand are to be driven in order to eliminate the existing errors both in the middle of the band and at the edges of the band.
  • FIG. 3 first shows what result an actuator 11 that would only act by changing the roller bending would have. It can be seen that the long band center 12 of FIG. 2 can be eliminated except for a portable deviation according to curve 13 in FIG. In connection with this, however, the edge waves 14, which clearly appear on the edge side according to FIG. 2, are not only not eliminated, but even more so, as is shown by the edge-side curve profiles 15 in FIG. 3.
  • the invention now teaches actuators 11 and 16 to function simultaneously. If one were to do this in the usual way, there would be the danger of obtaining more or less results of the type shown in FIG. 3 or FIG. 5. The reason for this is that each actuator has its own speed at which it adopts its specified setpoint.
  • the invention intervenes by taking its speeds into account during the adjustment time.
  • the speeds can be measured beforehand without any problems under operating conditions, so that there is a specific speed value for each actuator. If one assumes that the actuating speed measured in this way is twice as high for actuator 11 as that for actuator 16, actuator 11 would normally cover its default value in half the time in which actuator 16 would have reached its predetermined position. in the The result would not be that several band faults could be eliminated at the same time.
  • the speed for the drive of the faster actuator 11 is now throttled so that it would reach its manipulated value under operational conditions at the same time that the slower actuator 16 would have assumed this position. It is therefore important to reduce the speed of this one actuator in accordance with a slower actuator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
EP89111664A 1988-07-08 1989-06-27 Méthode pour laminer à froid des feuilles et des bandes Expired - Lifetime EP0349885B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3823202A DE3823202A1 (de) 1988-07-08 1988-07-08 Verfahren zum kaltwalzen von blechen und baendern
DE3823202 1988-07-08

Publications (3)

Publication Number Publication Date
EP0349885A2 true EP0349885A2 (fr) 1990-01-10
EP0349885A3 EP0349885A3 (fr) 1991-11-13
EP0349885B1 EP0349885B1 (fr) 1995-01-11

Family

ID=6358277

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89111664A Expired - Lifetime EP0349885B1 (fr) 1988-07-08 1989-06-27 Méthode pour laminer à froid des feuilles et des bandes

Country Status (5)

Country Link
US (1) US4981028A (fr)
EP (1) EP0349885B1 (fr)
JP (1) JP2776568B2 (fr)
KR (1) KR970001548B1 (fr)
DE (2) DE3823202A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009043501A1 (fr) * 2007-09-26 2009-04-09 Sms Siemag Ag Dispositif de laminage et procédé permettant de le faire fonctionner
US7797974B2 (en) 2004-07-06 2010-09-21 Sms Siemag Aktiengesellschaft Method and device for measuring and adjusting the evenness and/or tension of a stainless steel strip or stainless steel film during cold rolling in a 4-roll stand, particularly in a 20-roll sendzimir roll stand
CN115026136A (zh) * 2022-08-11 2022-09-09 东北大学 一种无头轧制楔形过渡过程板形预测方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5233852A (en) * 1992-04-15 1993-08-10 Aluminum Company Of America Mill actuator reference adaptation for speed changes
DE4402136C2 (de) * 1994-01-26 1997-12-18 Telefunken Microelectron Vorrichtung zur Bestimmung der Betriebsparamter von Fahrzeugreifen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714805A (en) * 1971-11-11 1973-02-06 Wean United Inc Control system and method for concurrent automatic gage and crown control of a rolling mill
DE3517405A1 (de) * 1984-05-18 1985-11-21 Osakeyhtiö Wärtsilä Ab, Helsinki Einrichtung zum regeln des biegeausgleichs einer satinierpresse
JPS62214814A (ja) * 1986-03-17 1987-09-21 Kobe Steel Ltd 多段圧延機における板形状の非線形制御法
US4726213A (en) * 1984-12-03 1988-02-23 Hitachi, Ltd. Method of controlling a shape of a rolled sheet material
JPS6356310A (ja) * 1986-08-25 1988-03-10 Hitachi Zosen Corp 板圧延機の制御方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3694636A (en) * 1970-03-20 1972-09-26 Westinghouse Electric Corp Digital computer process control with operational learning procedure
SE7613004L (sv) * 1976-11-22 1978-05-23 Asea Ab Signalomvandling.
DE3240602A1 (de) * 1982-11-03 1984-06-14 Betriebsforschungsinstitut VDEh - Institut für angewandte Forschung GmbH, 4000 Düsseldorf Verfahren zum regeln der zugspannungsverteilung beim kaltwalzen von baendern
DE3430034A1 (de) * 1984-08-16 1986-02-27 Mannesmann AG, 4000 Düsseldorf Planheitsregelung an bandwalzgeruesten

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714805A (en) * 1971-11-11 1973-02-06 Wean United Inc Control system and method for concurrent automatic gage and crown control of a rolling mill
DE3517405A1 (de) * 1984-05-18 1985-11-21 Osakeyhtiö Wärtsilä Ab, Helsinki Einrichtung zum regeln des biegeausgleichs einer satinierpresse
US4726213A (en) * 1984-12-03 1988-02-23 Hitachi, Ltd. Method of controlling a shape of a rolled sheet material
JPS62214814A (ja) * 1986-03-17 1987-09-21 Kobe Steel Ltd 多段圧延機における板形状の非線形制御法
JPS6356310A (ja) * 1986-08-25 1988-03-10 Hitachi Zosen Corp 板圧延機の制御方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PROCEEDINGS OF THE AMERICAN CONTROL CONFERENCE, BOSTON, 19.-21. Juni 1985, Vol. 3, 21. Juni 1985, Seiten 1359-1364, IEEE, NEW YORK; US; J.V. RINGWOOD: "LEAST SQUARES IDENTIFICATION WITH APPLICATION TO SHAPE CONTROL IN A SENDZIMIR COLD ROLLING STEEL MILL" *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7797974B2 (en) 2004-07-06 2010-09-21 Sms Siemag Aktiengesellschaft Method and device for measuring and adjusting the evenness and/or tension of a stainless steel strip or stainless steel film during cold rolling in a 4-roll stand, particularly in a 20-roll sendzimir roll stand
CN1980752B (zh) * 2004-07-06 2013-07-24 Sms西马格股份公司 在多辊式机架、尤其在20辊-森吉米尔轧机中对特殊钢带材或特殊钢箔材的平直度和/或带钢应力进行测量和调节的方法和装置
WO2009043501A1 (fr) * 2007-09-26 2009-04-09 Sms Siemag Ag Dispositif de laminage et procédé permettant de le faire fonctionner
CN115026136A (zh) * 2022-08-11 2022-09-09 东北大学 一种无头轧制楔形过渡过程板形预测方法

Also Published As

Publication number Publication date
KR970001548B1 (ko) 1997-02-11
EP0349885A3 (fr) 1991-11-13
EP0349885B1 (fr) 1995-01-11
DE58908868D1 (de) 1995-02-23
US4981028A (en) 1991-01-01
DE3823202A1 (de) 1990-01-11
JPH02133110A (ja) 1990-05-22
JP2776568B2 (ja) 1998-07-16
KR900001425A (ko) 1990-02-27

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