EP0102937B1 - 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
EP0102937B1
EP0102937B1 EP19830890081 EP83890081A EP0102937B1 EP 0102937 B1 EP0102937 B1 EP 0102937B1 EP 19830890081 EP19830890081 EP 19830890081 EP 83890081 A EP83890081 A EP 83890081A EP 0102937 B1 EP0102937 B1 EP 0102937B1
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.)
Expired
Application number
EP19830890081
Other languages
German (de)
English (en)
Other versions
EP0102937A1 (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 actuator of the stand depending on the measured thickness of the rolling stock, and with a computer that is connected to a sensor for a measured value that changes with the resistance to deformation of the rolling stock is and depending on this measured value, the controller is provided with a program-determined correction value for the scaffolding adjustment resulting from the determined target / actual value difference.
  • the strip thickness of the rolling stock being discharged is measured for the control of a cold rolling mill stand and the stand position is controlled by a controller depending on 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 due to The conveying time required to run through the conveying path between the roll gap and the thickness measuring device requires a dead time for the control. Deviations in thickness within this conveyor section can therefore in principle not be corrected with a simple thickness measurement after the roll gap.
  • the strip thickness is therefore measured not only after the roll gap, but also before the roll gap, so that differences in the thickness of the rolling stock can be detected even before it enters the roll gap and can be taken into account by means of a corresponding roll adjustment if the rolling stock spot deviations show the 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 does not only depend on the thickness of the strip in front of the roll gap, but also on the resistance to deformation of the rolling stock when the roll position remains the same. 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 also be taken into account when regulating the thickness. Such consideration of the deformation resistance is difficult, however, because the deformation resistance cannot be directly measured. Since 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 the detection of changing rolling stock conditions in front of the roll gap, is that a sensor is provided for determining the thickness and hardness of the rolling stock, which consists of two measuring heads which can be pressed onto the rolling stock from opposite sides under a predetermined force , so that the distance between these measuring heads depends on both the thickness of the rolling stock and its hardness.
  • a sensor is provided for determining the thickness and hardness of the rolling stock, which consists of two measuring heads which can be pressed onto the rolling stock from opposite sides under a predetermined force , so that the distance between these measuring heads depends on both the thickness of the rolling stock and its hardness.
  • 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 sensor for determining the resistance to deformation of the rolling stock consists of a magnetizing device for the rolling stock 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 by means of 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 being examined.
  • 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 setting 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.
  • 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, 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 areas of the rolling stock exhibiting these irregularities Run through the nip.
  • 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. For this purpose, it is not the rolling force but the hardness of the rolling stock 8 that is measured, with the aid of a measuring sensor 14.
  • This measuring 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 formed by either 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 recorded and taken into account when setting up the scaffolding.
  • 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)

Claims (1)

  1. Dispositif de régulation du serrage d'une cage de laminoir à froid (1), comportant un régulateur (4) qui commande le mécanisme de réglage du serrage de la cage sous la dépendance de l'épaisseur mesurée du produit laminé (8) et un ordinateur (12) qui est raccordé à un transmetteur de valeur mesurée (14) destiné à une valeur mesurée qui varie avec la résistance à la déformation du produit laminé (8) et, sous la dépendance de cette valeur mesurée, applique au régulateur (4) une valeur de correction, déterminée en vertu d'un programme, pour le serrage de cage résultant de la différence constatée entre valeur de consigne et valeur instantanée, caractérisé par le fait que le transmetteur de valeur mesurée (14) pour la détermination de la résistance à la déformation du produit laminé (8) se compose d'un dispositif de magnétisation du produit laminé (8), comportant au moins une bobine d'excitation, et d'un capteur adjoint au dispositif de magnétisation, par exemple une bobine de mesure ou un générateur Hall.
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 EP0102937A1 (fr) 1984-03-14
EP0102937B1 true 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)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19831480C1 (de) * 1998-07-14 2000-01-13 Schloemann Siemag Ag Verfahren zum Voreinstellen von Kaltverformungsanlagen
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
CN114985477B (zh) * 2022-05-10 2025-06-10 首钢京唐钢铁联合有限责任公司 十八辊轧机的厚度控制方法及控制装置
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

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1270868A (en) * 1968-09-23 1972-04-19 Froehling Fa Josef Methods and apparatus for controlling a machine for processing strip material

Also Published As

Publication number Publication date
AT374705B (de) 1984-05-25
ATA333282A (de) 1983-10-15
DE3361280D1 (en) 1986-01-02
EP0102937A1 (fr) 1984-03-14

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