EP0102937A1 - Dispositif pour commander l'épaisseur dans un laminoir à froid - Google Patents

Dispositif pour commander l'épaisseur dans un laminoir à froid Download PDF

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Publication number
EP0102937A1
EP0102937A1 EP19830890081 EP83890081A EP0102937A1 EP 0102937 A1 EP0102937 A1 EP 0102937A1 EP 19830890081 EP19830890081 EP 19830890081 EP 83890081 A EP83890081 A EP 83890081A EP 0102937 A1 EP0102937 A1 EP 0102937A1
Authority
EP
European Patent Office
Prior art keywords
rolling stock
resistance
deformation
thickness
rolling
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
EP19830890081
Other languages
German (de)
English (en)
Other versions
EP0102937B1 (fr
Inventor
Walther Dipl.-Ing. Ossoinig
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.)
Voestalpine AG
Original Assignee
Voestalpine AG
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 Voestalpine AG filed Critical Voestalpine AG
Publication of EP0102937A1 publication Critical patent/EP0102937A1/fr
Application granted granted Critical
Publication of EP0102937B1 publication Critical patent/EP0102937B1/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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/22—Hardness

Definitions

  • the invention relates to a device for adjusting the control of a cold rolling mill with a controller that controls the setting drive of the stand depending on the measured thickness of the rolling stock, and with a computer that, due to the program, a correction value for the stand position resulting from the setpoint-actual value difference determined as a function of a measured value that changes with the resistance to deformation of the rolling stock and the correction value is applied to the controller.
  • the strip thickness of the rolling stock being discharged is measured for the control of a cold rolling stand and the stand setting is controlled by a controller as a function of a target-actual value difference that may have been determined, the problem arises that a thickness measuring device can only be arranged at a certain distance from the roll gap, which is the case Due to the time required to travel through the conveyor path between the roll gap and the thickness gauge, a dead time for the control is required. Thickness deviations within this. In principle, therefore, the conveyor line cannot be adjusted with a simple thickness measurement after the roll gap.
  • the strip thickness is therefore not only after the roll gap, but also before the roll gap-measured, so that differences in thickness of the rolled material can be detected before the entry into the nip and taken into account by a corresponding roll adjustment when the variations in thickness having a W lzgutstelle passes through the nip.
  • a feedforward control for the thickness control is consequently achieved, which considerably improves the rolling result.
  • the thickness of a cold-rolled strip depends not only on the thickness of the strip in front of the roll gap, but also on the resistance to deformation of the rolling stock. Since the resistance to deformation in turn depends on the chemical-physical composition of the rolling stock and its treatment, a change in the resistance to deformation over the length of the rolling stock must be expected.
  • the changing resistance to deformation of the rolling stock must therefore also be taken into account in the thickness control.
  • the rolling force to be applied depends on the resistance to deformation of the rolling stock
  • the rolling force is also used to calculate a correction value for the stand position resulting from the setpoint-actual value difference.
  • a disadvantage of this known device which allows changing rolling stock conditions in front of the roll gap to be detected is, however, that a measuring transducer is provided for determining the thickness and hardness of the rolling stock, which can be pressed against the rolling stock from two sides by a predetermined force from opposite sides Measuring heads exist, so that the distance between these measuring heads depends on both the thickness of the rolling stock and its hardness.
  • a measuring transducer is provided for determining the thickness and hardness of the rolling stock, which can be pressed against the rolling stock from two sides by a predetermined force from opposite sides
  • Measuring heads exist, so that the distance between these measuring heads depends on both the thickness of the rolling stock and its hardness.
  • the influences of fluctuations in thickness and fluctuations in hardness are different and fundamentally between these influences such a regulation of the scaffold position remains subject to errors.
  • the invention is therefore based on the object of improving a device for adjusting the control of a cold rolling mill so that the rolling result can be improved by taking more account of the influence of a changing resistance to deformation.
  • the invention solves this problem in that the computer for determining the correction value dependent on the deformation resistance of the rolling stock is connected to a measuring transducer, consists of a magnetizing device with at least one excitation coil and a measuring sensor assigned to the magnetizing device, for example a measuring coil or a Hall generator .
  • this special transducer enables a continuous, non-contact measurement of the hardness of the rolling stock, even for non-ferromagnetic rolling stock.
  • the excitation coil induces eddy currents in the rolling stock, the size, phase position and distribution of which are largely determined by the physical properties and the electrical conductivity.
  • the magnetic field caused by these induced eddy currents can be detected either directly by a Hall generator or indirectly via a voltage induced in a measuring coil, so that measurement values can be obtained from such sensors, which also allow a conclusion to be drawn about the hardness of the material under investigation.
  • Such devices for magnetic testing of metal strips are known per se and are usually used for quality control of finished strips.
  • the correction factor determined by the computer can be related more precisely to fluctuations in the deformation resistance in accordance with the actual conditions.
  • the cold rolling stand 1 shown has an employment for the upper roll 2, an actuator 3 in the form of a hydraulic cylinder being used. Instead of this hydraulic adjustment, an electromechanical top roller adjustment could also be provided.
  • a controller 4 is used to control the hydraulic cylinder 3 and acts on a control valve 6 for the hydraulic medium line 7 via a control line 5. The controller 4 thus controls the stand position as a function of the setpoint / actual value difference of the measured thickness of the rolling stock 8.
  • a measuring value transmitter 9 for the actual value of the rolling stock thickness is assigned to the cold rolling stand 1. Since it is only a question of the detection of the actual value of the thickness, the transmitter 9 can have any structure. For reasons of clarity, a thickness measuring device is shown which scans the thickness of the rolling stock with the aid of a measuring roller 10.
  • a sensor 11 with the same effect is also provided on the inlet side for the thickness detection of the rolling stock.
  • the measured value of the transducer 11 is fed to a computer 12, which determines a correction value for the stand position resulting from the setpoint / actual value difference determined, in order to be able to take irregularities of the rolling stock in front of the roll gap into account when setting up the stand, if the rolling stock areas having these irregularities include the roll gap run through.
  • knowledge of the rolling stock speed is required so that the running time of the rolling stock 8 from the measuring point to the roll gap can be taken into account.
  • Corresponding speed sensors 13 in front of and behind the roll gap therefore detect the rolling stock speed before and after the roll gap and pass these measured values on to the computer 12.
  • the scaffold adjustment is thus corrected with a delay adapted to the running time of the belt.
  • the correction value determined by the computer 12 takes into account not only the disturbance variables caused by fluctuations in the thickness of the incoming rolling stock, but also disturbance variables which occur as a result of fluctuations in the resistance to deformation.
  • a sensor 14 advantageously consists of a magnetizing device having an excitation coil which generates eddy currents in the rolling stock, the magnetic field of which is detected by a sensor is the ent is not formed by a Hall generator or a measuring coil. Since the size, phase and distribution of the eddy currents change with the physical properties of the rolling stock, a measurement of the hardness of the rolling stock can be derived from the eddy currents.
  • This hardness changes largely proportionally with the resistance to deformation, so that changes in the resistance to deformation can be detected via the measured value for the hardness.
  • the advantage of such a detection of the deformation resistance is not only due to the greater accuracy with which changes in the deformation resistance can be determined, but above all that changes in the deformation resistance of the rolling stock, which lead to changes in the deformation resistance, are recognized even before the roll gap and can therefore be taken into account when setting up the scaffolding.
  • the computer 12 can therefore calculate a correction value for the respective scaffold position, which also takes account of changes in the resistance to deformation in advance. This enables a very precise control of the strip thickness because the disturbance variables in front of the roll gap can be detected and taken into account when setting up the stand.
  • the computer 12 can of course also correct other influencing variables on the basis of its program, if this is desired. First and foremost, the resilient yielding of individual scaffolding parts under appropriate loads and the floating of the bearings are to be mentioned.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
EP19830890081 1982-09-07 1983-05-11 Dispositif pour commander l'épaisseur dans un laminoir à froid Expired EP0102937B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT3332/82 1982-09-07
AT333282A AT374705B (de) 1982-09-07 1982-09-07 Vorrichtung zur anstellregelung eines kaltwalzgeruestes

Publications (2)

Publication Number Publication Date
EP0102937A1 true EP0102937A1 (fr) 1984-03-14
EP0102937B1 EP0102937B1 (fr) 1985-11-21

Family

ID=3548919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830890081 Expired EP0102937B1 (fr) 1982-09-07 1983-05-11 Dispositif pour commander l'épaisseur dans un laminoir à froid

Country Status (3)

Country Link
EP (1) EP0102937B1 (fr)
AT (1) AT374705B (fr)
DE (1) DE3361280D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0972580A2 (fr) * 1998-07-14 2000-01-19 Sms Schloemann-Siemag Aktiengesellschaft Procédé pour prérégler d'installations de formage à froid
WO2010043775A1 (fr) * 2008-10-17 2010-04-22 Siemens Vai Metals Technologies Sas Dispositif et methode de reglage d'une installation de transformation de bandes d'acier en fonction d'une epaisseur arbitraire des dites bandes d'acier
EP2662158A1 (fr) * 2012-05-07 2013-11-13 Siemens Aktiengesellschaft Procédé de traitement de produits à laminer et laminoir
CN117019882A (zh) * 2023-08-24 2023-11-10 北京科技大学 考虑热轧来料信息的带钢冷连轧自动厚度前馈控制方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665743A (en) * 1968-09-23 1972-05-30 Froehling Fa Josef Measuring and control apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3665743A (en) * 1968-09-23 1972-05-30 Froehling Fa Josef Measuring and control apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0972580A2 (fr) * 1998-07-14 2000-01-19 Sms Schloemann-Siemag Aktiengesellschaft Procédé pour prérégler d'installations de formage à froid
EP0972580A3 (fr) * 1998-07-14 2002-12-11 SMS Demag AG Procédé pour prérégler d'installations de formage à froid
WO2010043775A1 (fr) * 2008-10-17 2010-04-22 Siemens Vai Metals Technologies Sas Dispositif et methode de reglage d'une installation de transformation de bandes d'acier en fonction d'une epaisseur arbitraire des dites bandes d'acier
EP2662158A1 (fr) * 2012-05-07 2013-11-13 Siemens Aktiengesellschaft Procédé de traitement de produits à laminer et laminoir
WO2013167366A1 (fr) * 2012-05-07 2013-11-14 Siemens Aktiengesellschaft Procédé d'usinage d'un produit à laminer et laminoir
CN104321151A (zh) * 2012-05-07 2015-01-28 西门子公司 用于加工轧件的方法和轧机
CN117019882A (zh) * 2023-08-24 2023-11-10 北京科技大学 考虑热轧来料信息的带钢冷连轧自动厚度前馈控制方法
CN117019882B (zh) * 2023-08-24 2024-04-16 北京科技大学 考虑热轧来料信息的带钢冷连轧自动厚度前馈控制方法

Also Published As

Publication number Publication date
EP0102937B1 (fr) 1985-11-21
DE3361280D1 (en) 1986-01-02
ATA333282A (de) 1983-10-15
AT374705B (de) 1984-05-25

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