EP0151675B1 - Procédé de réglage automatique du taux de réduction dans un laminoir - Google Patents

Procédé de réglage automatique du taux de réduction dans un laminoir Download PDF

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Publication number
EP0151675B1
EP0151675B1 EP19840107573 EP84107573A EP0151675B1 EP 0151675 B1 EP0151675 B1 EP 0151675B1 EP 19840107573 EP19840107573 EP 19840107573 EP 84107573 A EP84107573 A EP 84107573A EP 0151675 B1 EP0151675 B1 EP 0151675B1
Authority
EP
European Patent Office
Prior art keywords
reduction
thickness
rate
input
output
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
EP19840107573
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German (de)
English (en)
Other versions
EP0151675A3 (en
EP0151675A2 (fr
Inventor
Hitoshi Aizawa
Masaaki Takarada
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.)
JFE Steel Corp
Original Assignee
Kawasaki Steel Corp
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
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Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to DE1984107573 priority Critical patent/DE151675T1/de
Priority to DE8484107573T priority patent/DE3177252D1/de
Priority to EP19840107573 priority patent/EP0151675B1/fr
Publication of EP0151675A2 publication Critical patent/EP0151675A2/fr
Publication of EP0151675A3 publication Critical patent/EP0151675A3/en
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Publication of EP0151675B1 publication Critical patent/EP0151675B1/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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/18—Automatic gauge control
    • 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

Definitions

  • the invention relates to a method of automatically controlling the rate of reduction in a rolling mill for rolling a material being rolled at a predetermined rate of reduction.
  • the ARC contemplates to correct the input deviation by the value corresponding to the rate of reduction, whereby the output value of rate of reduction is low as compared with the aforesaid AGCs, so that the load of the screwdown system can be low, the responsibility enhanced and the stability improved.
  • a specific method of ARC in which the rate of reduction is controlled at a predetermined value, is one in which the rate of reduction is detected to control the roll gap to become equal to the desired rate of reduction in the same manner as in the ordinary strip thickness control, in which the strip thickness of the output side of the mill is measured to control the rate of reduction.
  • ARC contemplates to obtain a constant rate of reduction by rolling at a predetermined pressure by use of an accumulator and rolls being low in elasticity.
  • the mills having a multi-roll arrangement have hysterisis due to friction and looseness thus presenting such a disadvantage that a constant rate of reduction is not easily obtainable. It is therefore the task of the present invention to provide a method of automatically controlling the rate of reduction in a rolling mill, capable of carrying out rolling at a constant rate of reduction being stabilized with high accuracy.
  • This task is solved by a method of automatically controlling the rate of reduction in a rolling mill for rolling a material being rolled at a predetermined rate of reduction, wherein the rate of reduction is controlled in such a manner, that an output thickness of the material being rolled is calculated from an actually measured input thickness of the material and a desired rate of reduction based on the principle of the constant massflow rate of the material being rolled, an input thickness is estimated from the output thickness thus calculated, an input length, an output length and a correction value obtained by adding and averaging a difference between a calculated output thickness deviation and an actually measured thickness deviation of the material being rolled over a predetermined length of material. and the difference between the estimated input thickness and an actually measured input thickness can be diminished to zero.
  • Fig. 1 is a block diagram, showing a reduction control system, in which the method of automatically controlling the rate of reduction according to the present invention is applied to a reversing mill
  • Fig. 2 is a diagram showing an example of the changes in thickness deviation in the use of the inventive method
  • Fig. 3 is a diagram showing an example of recorded results of the rate of reduction in the use of the invention.
  • This diagram shows input length detecting means including a small touch roll 10, a pulse generator 11 and an input length counter 101 for detecting an input length Le of an material 6 being rolled in the mill 8, an input thickness gauge 31 for detecting an actually measured input thickness Gea of the material 6 an input thickness deviation output circuit 33 for feeding a difference ⁇ Gi between the actually measured input thickness Gia fed from the input thickness gauge 31 and, input thickness reference value Gis, an input thickness deviation shift register 60 for storing the input thickness deviation ⁇ Gi fed from the input thickness deviation output circuit 33, successively shifting same in accordance with the measured distances in response to output signal fed from the aforesaid input length counter 101 and feeding data immediately before the positions of the work rolls, a desired reduction output circuit 50 for calculating a desired rate of reduction R from the input thickness reference value Gis and an output thickness reference value Gos and feeding same, output length detecting means including a small touch roll 20, a pulse generator 21 and an output length counter 111 for detecting an output length Lo of the material 6, a calculating circuit 150 for initiating calculation each
  • the input length Li is measured such that the number of rotations of the touch roll 10 provided on the center line of the deflector roll 41 disposed forwardly of the mill 8 is converted into pulses by means of the pulse generator 11 and counted by means of the input length counter 101.
  • the digital or analog input length Li thus obtained is fed to the calculating circuit 150.
  • the actually measured input thickness Gia is measured by means of the input thickness gauge 31 interposed between the deflector roll 41 and the positions of work rolls, compared with the input thickness reference value Gis in the thickness deviation output circuits 33, and the input thickness deviation ⁇ Gi thus obtained is fed to the input thickness deviation shift register 60.
  • the input thickness deviations ⁇ Gi thus supplied are successively shifted in response to outputs from the input length counter 101, whereby the input thickness deviation ⁇ Gi immediately before the positions of work rolls is fed from the shift register 60 to the calculating circuit 150.
  • the desired rate of reduction r is calculated from the input and output thickness reference signals Gis and Gos, which have been set by the operator, in the desired reduction calculating circuit 50, and then, fed to the calculating circuit 150 as a constant.
  • the output length is detected by means of the pulse generator 21 of the touch roll 20 being in contact with the deflector roll 42 disposed at the output side of the mill 8, passed through the output length counter 111, and fed to the calculating circuit 150 as the digital or analog output length signal Lo.
  • an estimated input thickness Gic is calculated through the equation (1) from the abovedescribed various data, i.e., the input length Li, the output length Lo, the input thickness deviation Gi, the output thickness reference value Gos, and the desired rate of reduction r at every sampling of the input pulse generator 11, an error signal ⁇ x (ARC) between the estimated input thickness Gic and the aforesaid actually measured input thickness Gia fed to the screwdown servo-mechanism 93 of the screwdown apparatus 90.
  • the electro-hydraulic servo-valve 92 controls the reduction action of the hydraulic cylinder 91 in a manner to diminish the aforesaid error signal ⁇ x (ARC) to zero at all times.
  • the feedback mechanism is for correcting errors in the rate of reduction due to the difference in diameter between the touch rolls at the input and, output sides and the influence of the width spread of the material being rolled is performed by use of the output thickness deviation. More specifically a calculated output thickness deviation is obtained from the input thickness deviation ⁇ Gi (l-r), the calculated output thickness does obtain this compared with an actually measured output deviation ⁇ Go and the difference therebetween thus obtained is used as the correction value against the static control disturbance.
  • a correction value C in the equation(3) is obtained everytime after a plurality of n samplings have been conducted and correction is carried out by the form of the equation (2).
  • the rate of reduction is usually represented by
  • Figs. 2 and 3 are recording charts showing the deviation of strip thickness and the rate of reduction in the case of applying the present invention.
  • Fig 2 shows an example where a test coil being trapezodial shape and having a strip thickness of approximately ⁇ 10 micrometre is rolled at a certain rate of reduction, in which is best shown the condition that the change in output thickness indicated by D follows the change in input thickness indicated by E. Additionally, according to the record of the rate of reduction, it is found that the material is rolled within ⁇ 1% with respect to the desired value 9%.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Claims (1)

  1. Méthode de contrôle automatique du taux de réduction dans un laminoir pour laminer un matériau à laminer à un taux de réduction prédéterminé, le taux de réduction étant contrôlé de telle sorte qu'une épaisseur de sortie du matériau laminé est calculée à partir d'une épaisseur d'entrée du matériau effectivement mesurée et à un taux de réduction désiré fondé sur le principe du taux constant du débit massique du matériau laminé, une épaisseur d'entrée étant estimée d'après l'épaisseur de sortie d'abord calculée, une longueur d'entrée, une longueur de sortie et une valeur de correction obtenue en additionnant et en établissant une différence moyenne entre une déviation d'épaisseur de sortie calculée et une déviation d'épaisseur effectivement mesurée du matériau laminé sur une longueur prédéterminée du matériau et une différence entre l'épaisseur d'entrée estimée et une épaisseur d'entrée effectivement mesurée peut être diminuée jusqu'à zéro.
EP19840107573 1981-04-29 1981-04-29 Procédé de réglage automatique du taux de réduction dans un laminoir Expired EP0151675B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE1984107573 DE151675T1 (de) 1981-04-29 1981-04-29 Verfahren zur automatischen steuerung der dickenabnahme in einem walzwerk.
DE8484107573T DE3177252D1 (de) 1981-04-29 1981-04-29 Verfahren zur automatischen steuerung der dickenabnahme in einem walzwerk.
EP19840107573 EP0151675B1 (fr) 1981-04-29 1981-04-29 Procédé de réglage automatique du taux de réduction dans un laminoir

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19840107573 EP0151675B1 (fr) 1981-04-29 1981-04-29 Procédé de réglage automatique du taux de réduction dans un laminoir

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP81103238.2 Division 1981-04-29

Publications (3)

Publication Number Publication Date
EP0151675A2 EP0151675A2 (fr) 1985-08-21
EP0151675A3 EP0151675A3 (en) 1987-11-04
EP0151675B1 true EP0151675B1 (fr) 1991-07-31

Family

ID=8192027

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840107573 Expired EP0151675B1 (fr) 1981-04-29 1981-04-29 Procédé de réglage automatique du taux de réduction dans un laminoir

Country Status (2)

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EP (1) EP0151675B1 (fr)
DE (2) DE151675T1 (fr)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3319444A (en) * 1964-11-09 1967-05-16 Allegheny Ludlum Steel Automatic control system for rolling mills and adjustable dies
LU54783A1 (fr) * 1967-11-03 1969-07-07
LU56094A1 (fr) * 1968-05-16 1970-01-14
US3624369A (en) * 1969-08-04 1971-11-30 Ruloff F Kip Jr Thickness reduction control systems
US3636743A (en) * 1970-06-15 1972-01-25 Allegheny Ludlum Ind Inc Rolling mill control system
FR2101263A5 (en) * 1970-07-06 1972-03-31 Jeumont Schneider Strip thickness continuous control appts - using an analogue retarding appts a slow correction loop and an automatic adjustment loop
US4244025A (en) * 1979-03-20 1981-01-06 Alshuk Thomas J Rolling mill gauge control system
JPS5666314A (en) * 1979-11-05 1981-06-04 Kawasaki Steel Corp Automatic controlling method for draft percentage of rolling mill
US4428054A (en) * 1979-11-05 1984-01-24 Kawasaki Steel Corporation Automatic control methods and devices for rolling hills
JPS57181711A (en) * 1981-05-01 1982-11-09 Kawasaki Steel Corp Automatically controlling method of draft of rolling mill

Also Published As

Publication number Publication date
EP0151675A3 (en) 1987-11-04
DE3177252D1 (de) 1991-09-05
EP0151675A2 (fr) 1985-08-21
DE151675T1 (de) 1986-02-27

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