EP3795267A1 - Procédé de fonctionnement d'une cage de laminoir - Google Patents

Procédé de fonctionnement d'une cage de laminoir Download PDF

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Publication number
EP3795267A1
EP3795267A1 EP20196043.2A EP20196043A EP3795267A1 EP 3795267 A1 EP3795267 A1 EP 3795267A1 EP 20196043 A EP20196043 A EP 20196043A EP 3795267 A1 EP3795267 A1 EP 3795267A1
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EP
European Patent Office
Prior art keywords
setpoint
controlled variable
actuator
master
slave
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
EP20196043.2A
Other languages
German (de)
English (en)
Other versions
EP3795267B1 (fr
Inventor
Jörn Sieghart
Dietrich Mathweis
Frank Gorgels
Roland Dinger
Ronny PETERS
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.)
SMS Group GmbH
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SMS Group GmbH
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Publication date
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Application filed by SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP3795267A1 publication Critical patent/EP3795267A1/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
    • 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
    • B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
    • B21B37/32—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by cooling, heating or lubricating the rolls
    • 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
    • B21B37/38—Control of flatness or profile during rolling of strip, sheets or plates using roll bending
    • 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
    • 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

Definitions

  • the invention relates to a method for operating a roll stand with a pair of work rolls which span a roll gap for rolling a metal strip.
  • Such roll stands are known in principle in the prior art, such. B. from the Chinese patent CN 102581035 B .
  • Each of the k'th control loops has a k'th actuator for controlling a k'th controlled variable.
  • the setpoint value for the first controlled variable in the prior art is variable over time or has a time variable portion to compensate for changes in process variables during a rolling process. Due to the temporal variability of the setpoint, the actuator of the first control loop can reach its performance limit; please refer Figure 5a : "without correction". This can result in a short travel amount in the first actuator. In the prior art, this shortfall in travel cannot be adequately compensated for by the known further control loops of the roll stand.
  • the invention is based on the object of developing a known method for operating a roll stand with a first and at least one further control loop in such a way that the occurrence of a power deficit in the actuator of the first control loop is prevented.
  • the monitoring of the temporal course of the setpoint of the first control variable with regard to the threshold values Min, Max, which are within the performance limits of the first actuator, which is claimed there, advantageously enables a preventive initiation of a countermeasure before the master actuator is set on the basis of a setpoint that is too large reaches its performance limit for the first controlled variable.
  • the countermeasure provides that when the minimum or maximum threshold value is reached, i.e. before the lower or upper performance limit of the master actuator is reached, the setpoint for the first controlled variable is increased or decreased by a correction component determined according to the invention.
  • the corrected setpoint value calculated in this way for the first controlled variable is usually smaller in terms of magnitude than the previously provided setpoint value and is specified instead of the previously provided setpoint value for the first control loop.
  • the correction components for the master setpoint SM are measured preventively in such a way that the master actuator is not even driven to its upper or lower performance limit.
  • the stability of a rolling mill can be increased by moving actuators to operating points that are favorable for the rolling process in a targeted manner by virtue of the inventive linking of the master-slave control loops.
  • These working points can offer process engineering advantages, such as a targeted control of the actuators in tried and / or pre-calculated working areas.
  • actuators by selecting the threshold values (min, max), are specifically driven into areas in which their behavior is almost linear.
  • actuators with high dynamic properties are strategically kept in work areas which you can react quickly to any process changes that may occur, such as damage to the incoming material.
  • the assignment of the link between master and slave actuators offers additional flexibility.
  • the assignment of the actuators can be different for different process situations and / or types of plant. For example, with a bandwidth r, a different actuator can be defined as the master actuator than with a bandwidth j.
  • the assignment and priorities of the slave actuators can also be changed in real time using the factor a k for optimal adaptation to current process conditions.
  • the method according to the invention can be used both in hot rolling and in cold rolling of metal strip.
  • Both the master control loop and all slave control loops are operated continuously or iteratively over time.
  • nominal value used in part in the description and in the claims is representative of a time-variable nominal value signal. Due to the discrete-time consideration that is customary in digital technology, the aforementioned term “setpoint” is also used in the description; However, this setpoint is by no means necessarily to be regarded as constant over time.
  • Figure 1 shows a first or master control circuit 130 for controlling a first control variable in a roll stand 100 to a predetermined master setpoint value SM setpoint n * .
  • this setpoint is compared with an actual value of the controlled variable SM Ist n .
  • a comparator device 134 typically a difference calculator.
  • the result of this comparison is entered as a control deviation in a master controller 133, which generates an actuator for a master actuator 132 at its output.
  • the master actuator influences the controlled system 131 of the first or master control loop 130.
  • the controlled system here consists, for example, of a roll stand 100 for rolling metal strip 120 with the aid of work rolls 110 Work rolls 110 are each assigned to backup rolls.
  • the roll stand is designed in six-high construction, the roll stand also has intermediate rolls in addition to the work and back-up rolls (in Figure 1 Not shown).
  • the control loop 130 shown the controlled variable at the output of the controlled system 131 is detected with the aid of a detection device 136, typically a measuring element.
  • the recorded controlled variable is the said actual value of the controlled variable, which is switched at the output of the detection device 136 to the input of the master comparator device 134.
  • Figure 2 shows the structure of said master setpoint correction device 135 in detail.
  • the sum of the previous master setpoint SM Soll n and the previously calculated correction components y1_n-1 and y2_n-1 is monitored in a threshold monitoring device 135-1 to determine whether it exceeds a predetermined upper threshold Max or a predetermined one falls below the lower threshold value Min.
  • the result is provided at the output of the monitoring device 135-1, here by way of example in the form of the output signals x 1 , x 2 , which are for example binary-coded.
  • the signals x 1 and x 2 are in fact release signals for releasing a calculation unit 135-2 for a correction component y1 for the master setpoint value or to enable a calculation unit 135-3 for an alternative correction component y2 for the master setpoint value SM setpoint n .
  • the correction components y1 and y2 calculated in this way go according to Figure 2 into a calculation unit 135-4 for calculating the corrected setpoint value SM setpoint n * .
  • the calculation unit is typically an addition device which additively adds the correction components y1 or y2 to the previous master setpoint value SM setpoint n in order to calculate said corrected setpoint value signal in this way.
  • the correction component y1 is typically negative and the correction component y2 is typically positive.
  • the sign must be selected in such a way that the target value SM target n + 1 is shifted into the tolerance range.
  • the corrected target value SM target n * is typically smaller than the previous master target value SM target n .
  • the calculation units 135-2 and 135-3 for the correction components y1 and y2 are individually blocked; this is done with the in Figure 2 indicated disable signals DIS y2 and DIS y1 .
  • FIG. 3 illustrates the structure of such a slave control loop 140-k in detail. It has an analog structure for all slaves k.
  • the slave control circuit 140-k is used to regulate a slave controlled variable SL k actual n to a corrected setpoint SL k setpoint n *.
  • the actual value of the controlled variable is detected with the aid of a detection device 146-k and compared with the corrected setpoint SL k setpoint n * in a slave comparator 144-k.
  • the result is fed in the form of a control deviation to the kth controller 143-k, which provides a control signal for a kth slave actuator 142-k at its output.
  • the slave actuator 142-k influences a k'th controlled system 141-k.
  • This slave controlled system 141 - k is typically the same roll stand 100 that also represents the master controlled system 131 of the first control loop 130.
  • Figure 4 shows the structure of a k'th setpoint correction device 145-k in detail.
  • the determined travel shortfall is distributed to the remaining slave actuators by appropriately changing the respective coefficients a k of the remaining slave actuators.
  • the power deficits ⁇ p k ascertained in the k slave setpoint correction devices 145-k are also sent to an in Figure 4
  • the power distribution calculating device 150 shown is input so that, on the basis of the input signals mentioned, it calculates the coefficients a k for the individual slave setpoint correction devices 145-k updated and also provides the disable signals DIS y1 and DIS y2 for the calculation units 135-2 and 135-3 for the correction components y1 and y2.
  • At least one of the correction components of the first controlled variable is kept constant; this is done by said disable signals DIS y1 and DIS y2 , which are calculated by the power distribution calculator 150, as above with reference to FIG Figure 4 described.
  • Figure 5a the upper and lower physical performance limits of the master actuator 132 are entered. They correspond to an upper and / or a lower, positive and / or negative operating limit of the master actuator 132.
  • the invention provides that these performance limits when the master actuator is controlled with the associated control signal S generated by the master controller 133 x should under no circumstances be reached, no matter how great the master setpoint or its change over time.
  • the desired value SM Soll n is monitored according to the invention with the aid of the monitoring device 135-1 with regard to the achievement of lower threshold limit values Max, Min. These limit values are lower in that they are within the upper and lower performance limits of the master actuator.
  • this corrected master setpoint at the time n1 is also monitored in the monitoring device 135-1 with regard to reaching the upper or lower limit value. If this is determined at time n2, a new correction takes place, specifically a renewed reduction of its value by a then newly calculated correction component y1. This correction results in another corrected master setpoint value SM setpoint n2 * at time n2.
  • Figure 5c the reaction of the slave actuator according to the invention is displayed. This serves to avoid disturbances in the flatness of the strip that would be caused by the preventive procedure of the master actuator.
  • the master actuator is moved through the opposing control of at least one slave actuator with only minor flatness disturbances or even flatness-neutral.
  • Each of the mentioned combinations of controlled variables for the six-high stand can also be supplemented by zone cooling as a third controlled variable.
  • the bending device is preferably specified as the master actuator 132.
  • a Profile-Gauge Meter PGM In the case of four-high and six-high roll stands, flatness disturbances due to fluctuations in the rolling force are compensated for by a Profile-Gauge Meter PGM.
  • the functioning of the PGM includes the precontrol of changes in the rolling force on bends in order to keep the roll gap profile and / or the roll gap contour between the work rolls 110 of the roll stand 100 as constant as possible in the event of a fluctuation in the rolling force.
  • the quality of the difference quotients dQM required for the PGM pre-control depends heavily on the current operating point.
  • the PGM must always have a bending reserve in order to be able to withstand a sudden change in force, e.g. B.
  • the bending reserve corresponds to Figure 5a the distance between the upper power limit and the upper limit value Max or the distance between the lower power limit and the lower limit value Min.
  • the work roll bending is used for the PGM precontrol and is accordingly defined as a master controlled variable with corresponding master setpoint specifications.
  • the associated master actuator 132 can reach its physical limits, ie its upper or lower performance limit.
  • an allowable error e.g. B. 4th order
  • the master actuator is moved through the opposing control of at least one slave actuator with only minor disturbances in flatness or even flatness-neutral.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
EP20196043.2A 2019-09-18 2020-09-14 Procédé de fonctionnement d'une cage de laminoir Active EP3795267B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019214192.7A DE102019214192A1 (de) 2019-09-18 2019-09-18 Verfahren zum Betreiben eines Walzgerüstes

Publications (2)

Publication Number Publication Date
EP3795267A1 true EP3795267A1 (fr) 2021-03-24
EP3795267B1 EP3795267B1 (fr) 2022-07-13

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ID=72517109

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20196043.2A Active EP3795267B1 (fr) 2019-09-18 2020-09-14 Procédé de fonctionnement d'une cage de laminoir

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EP (1) EP3795267B1 (fr)
DE (1) DE102019214192A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000449A (en) * 1974-10-22 1976-12-28 Westinghouse Electric Corporation Electrical shaft system
CN102581035A (zh) 2012-01-30 2012-07-18 中冶南方工程技术有限公司 一种冷轧带钢板形前馈控制系统

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55120409A (en) 1979-03-09 1980-09-16 Nippon Steel Corp Controlling method for shape in six-stage rolling mill
EP0171732B1 (fr) 1984-08-10 1990-10-17 Kabushiki Kaisha Toshiba Méthode et système de contrôle d'épaisseur pour cage de laminoir unique à passes multiples
JPH0724849B2 (ja) 1986-01-20 1995-03-22 新日本製鐵株式会社 板圧延における形状制御方法
JPS63177910A (ja) 1987-01-16 1988-07-22 Nippon Steel Corp 板圧延における形状制御方法
JPH0636926B2 (ja) 1989-03-29 1994-05-18 住友金属工業株式会社 板圧延における形状制御方法
JP2743126B2 (ja) 1991-10-11 1998-04-22 株式会社日立製作所 ６重圧延機の形状制御方法および装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4000449A (en) * 1974-10-22 1976-12-28 Westinghouse Electric Corporation Electrical shaft system
CN102581035A (zh) 2012-01-30 2012-07-18 中冶南方工程技术有限公司 一种冷轧带钢板形前馈控制系统

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
POLLMANN A J ED - INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS: "CONTROL STRATEGIES FOR ROLLING MILLS", CONFERENCE RECORD OF THE INDUSTRY APPLICATIONS CONFERENCE IAS ANNUAL MEETING. TORONTO, OCT. 3 - 8, 1993; [CONFERENCE RECORD OF THE INDUSTRY APPLICATIONS CONFERENCE IAS ANNUAL MEETING], NEW YORK, IEEE, US, vol. PART 03, 3 October 1993 (1993-10-03), pages 2420 - 2425, XP000420468 *

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EP3795267B1 (fr) 2022-07-13
DE102019214192A1 (de) 2021-03-18

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