EP0063633B1 - Procédé et dispositif de commande automatique pour laminoirs - Google Patents

Procédé et dispositif de commande automatique pour laminoirs Download PDF

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Publication number
EP0063633B1
EP0063633B1 EP19810103238 EP81103238A EP0063633B1 EP 0063633 B1 EP0063633 B1 EP 0063633B1 EP 19810103238 EP19810103238 EP 19810103238 EP 81103238 A EP81103238 A EP 81103238A EP 0063633 B1 EP0063633 B1 EP 0063633B1
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Prior art keywords
thickness
output
input
agc
arc
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Expired
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EP19810103238
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German (de)
English (en)
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EP0063633A1 (fr
Inventor
Hitoshi Aizawa
Masaaki Takarada
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JFE Steel Corp
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Kawasaki Steel Corp
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Application filed by Kawasaki Steel Corp filed Critical Kawasaki Steel Corp
Priority to DE8181103238T priority Critical patent/DE3174969D1/de
Priority to EP19810103238 priority patent/EP0063633B1/fr
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    • 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

Definitions

  • the present invention relates to methods of automatically controlling the strip thickness in a rolling mill for producing a rolled product having a desired thickness and to apparatuses for carrying out the methods.
  • the form AGC includes various types such as the so-called BISRA, AGC, Feedback AGC, Massflow AGC and Forward AGC, each of which suffers from the following problems.
  • a system of this type (AGC) is e.g. disclosed in the US-A-42 44 025. This system uses Feedback AGC together with Forward AGC.
  • the former is the method in which an output signal for control is emitted only when a present value of deviation is exceeded, e.g., by ⁇ 1ro ⁇ 2 Ilm, however, there is such a disadvantage that, decreased dead band results in lowered effects and increased dead band does not meet the required accuracy in strip thickness, so that practically, it is difficult to attain an improvement in the accuracy in strip thickness by use of only this method.
  • the response of the screwdown system should be varied in accordance with the number of rolling passes.
  • the aforesaid 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 AGC's so that the load of the screwdown system can be low, the responsibility enhanced and the stability improved.
  • the strip thickness is controlled within a certain deviation ( ⁇ 10 pm, ⁇ 5 Ilm, for example) in the preceding rolling, then the deviation can be decreased in accordance with the rate of reduction, so that a comparatively moderate control can be effected.
  • a system, using the ARC mode is disclosed in the US-A-36 24 369.
  • respective pressure control reduction rates are preset according to the applications of the materials, and the rate of reduction displays a great influence on the mechanical properties and other characteristics of a product.
  • the rate of reduction displays a great influence on the magnetic characteristics. Consequently, with certain types of materials, there are some cases where the rate of reduction in the direction of rolling is required to be set at a predetermined value.
  • a specific method of ARC in which the rate of reduction is controlled at a predetermined value for use in the case as described above, 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 at the output side of the mill is measured to control the rate of reduction.
  • the method of measuring the rate of reduction there have, heretofore, been known a method of measuring the rate of reduction by use of a strip thickness gauge, a method of measuring the percentage of elongation from the strip length or strip speed by use of deflector rolls, etc.
  • 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.
  • this object is obtained by a method of automatically controlling the strip thickness in a rolling mill for producing a rolled product having a desired thickness, wherein an automatic gauge control (AGC) mode for reducing to zero the deviation from the predetermined desired output thickness of a material being rolled and an automatic reduction rate control (ARC) mode for reducing to a predetermined value the rate of reduction of the material being rolled, are selected in accordance with the rolling condition in such a way, that a reference deviation of the output thickness of the material being rolled from the predetermined desired uniform gauge thickness is set and the aforesaid AGC mode is selected when an actually measured deviation of the output thickness exceeds said reference deviation, and said ARC mode is selected when an actually measured deviation of the output thickness does not reach said reference deviation.
  • AGC automatic gauge control
  • ARC automatic reduction rate control
  • a control output of ARC is less than that of AGC principally, so that the load of the reduction system is low, the responsibility and the stability is improved.
  • ARC there remains a deviation which corresponds to a dead band according to the rate of reduction, the absolute accuracy of the strip thickness is lowered to a large value of deviation. Consequently, a certain reference deviation is set as described above, and, if an actually measured deviation exceeds the reference deviation, then control is effected by use of the conventional AGC, while, if an actually measured deviation doe not reach the reference deviation then ARC is used in contrast to the above. If this reference deviation is set at ⁇ 5 um, then the accuracy of controlling within ⁇ 3 Il m can be obtained after two or three passes, and a stabilized controlling of the strip thickness can be achieved.
  • this object is obtained by a method of automatically controlling the strip thickness in a rolling mill for producing a rolled product having a desired thickness, wherein an automatic gauge control (AGC) mode for reducing to zero the deviation from the predetermined desired output thickness of a material being rolled and an automatic reduction rate control (ARC) mode for reducing to a predetermined value the rate of reduction of the material being rolled, are selected for respective passes.
  • AGC automatic gauge control
  • ARC automatic reduction rate control
  • Fig. 1 shows the deviations in strip thickness in the case the screwdown servo-loop system is approximately, simply represented by a first order lag system having a delay time L in a reversing mill.
  • Figs. 1(a) and 1(b) show deviations in strip thickness at the input side and the output side during pass 1
  • Figs. 1(c) and 1(d) show deviations in strip thickness at the input side and output side during pass 2.
  • this delay time L is variable according to the conditions including the number of rolling passes, the type of material to be rolled and the like, and hence, it is very difficult to estimate the length of the delay time L and perform controlling according thereto.
  • FIG. 2(d) is obtained in the case a sheet having an input deviation as shown in Fig. 1 (a) is rolled for pass 1 by use of AGC, and thereafter, rolled for pass 2 by use of ARC.
  • ARC is employed after AGC as shown in the drawing, even if the delay time is present to some level, the overshoot is low as indicated by symbol B, so that AGC can work in a stabilized condition during the succeeding rolling.
  • the aforesaid AGC mode is selected for pass 1, and, for pass 2 and thereafter, the ARC mode and AGC mode are alternatively selected, or when, in the case the total number of passes is an even number of four or more, the aforesaid AGC mode is selected for pass 1 and pass 2, and, for pass 3 and thereafter, the ARC mode and AGC mode are alternatively selected, because then the productivity is not hampered by decreased rolling speed, and the accuracy in strip thickness is improved as the number of rolling passes is increased.
  • the ARC mode is selected for the latter part of passes except the final pass, and the AGC mode is selected for the final pass.
  • the aforesaid ARC mode is adapted to control the rate of reduction in such a manner that an output thickness of the material being rolled is calculated from an actually measured thickness of the material at the input side of the mill and the desired rate of reduction based on the principle of the constant mass-flow rate of the material being rolled, an input thickness of the material being rolled is estimated from the output thickness thus calculated, an input length and an output length, and a difference between the estimated input thickness and an actually measured input thickness can be diminished to zero.
  • This method can be carried out by a device for automatically controlling the strip thickness in a rolling. mill, comprising:
  • a correction value calculating circuit is further included for obtaining a mean value of a difference between the output thickness reference value and the actually measured output thickness and feeding same as a feedback correction value for correcting error for AGC mode, and obtaining a calculated output thickness deviation from the input thickness deviation fed from the aforesaid input thickness deviation output circuit and the desired rate of reduction fed from the aforesaid desired reduction output circuit and feeding a mean value of a difference between the calculated output thickness deviation and the actually measured output thickness deviation to the aforesaid reduction calculating circuit as a feedback correction value for correcting an error for the ARC mode.
  • the aforesaid desired reduction output circuit is made to calculate the desired rate of reduction from the input thickness reference value and the output thickness reference value.
  • the estimated input thickness Gic is obtained from the equation (1) as follows:
  • the input thickness Gi is divided into two values including an input thickness reference value Gis and an input thickness deviation AGi, and indicated by the following equation.
  • an estimated output thickness Go is indicated by the following equation.
  • Gos represents an output thickness reference value and AGo an output thickness deviation.
  • the aforesaid input thickness deviation AGi is obtained through actual measurement of the input thickness by use of a thickness gauge provided at the input side of the work rolls.
  • the thickness gauge is spaced a predetermined distance apart from the work rolls.
  • a thickness detection signal is processed so that the value immediately before the work rolls can be used at all times. By this, the position of the succeeding rolling can be reliably estimated, high responsibility attained, and control with high accuracy achieved.
  • a calculated output thickness deviation is obtained from the input thickness deviation ⁇ Gi(1­r), the calculated output thickness thus obtained is compared with an actually measured output deviation AGo, and the difference therebetween thus obtained is used as the correction value against the steady control disturbance.
  • a correction value C in the following equation (7) is obtained every time after a plurality of n samplings have been conducted, and correction is carried out by the form of the equation (8).
  • the value of r is made to be 1 and correction may be carried out by use of the output thickness deviation AGo itself.
  • Fig. 2 is a block diagram showing the general control system of a first embodiment in which the method of automatically controlling the strip thickness according to the present invention is applied to a reversing mill, and
  • Fig. 3 is a block diagram showing a more detailed control system of the reduction calculating circuit used in the first embodiment.
  • the input thickness is estimated through the equations (5) and (6) based on the principle of the constant mass-flow rate of the material being rolled as described above, and the screwdown system is controlled so that the difference between the estimated input thickness and the actually measured input thickness can be diminished to zero.
  • AGC is used for control beyond a certain value of deviation
  • ARC is used for control below the abovedescribed value of deviation.
  • the abovedescribed first embodiment comprises:
  • the input length Li is measured such that the number of rotations of 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 the AGC input length counter 12 and the ARC input length counter 13, respectively, and then, fed to the AGC output calculating circuit 71 and the ARC output calculating circuit 72 of the calculating circuit 70 as the digital or analog length signals Li (AGC) and Li (ARC).
  • 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 circuit 33, and the input thickness deviation AGi is stored in the input thickness deviation shift register 60.
  • the input thickness deviation AGi thus stored are successively shifted in response to outputs from the counters 12, 13, i.e., in accordance with the measured distances, whereby the input deviation data immediately before the positions of work rolls are always fed from the shift register 60 to the AGC output calculating circuit 71 and the ARC output calculating circuit 72 of the calculating circuit 70.
  • the desired rate of reduction r used in calculation in the equation (5) for the ARC mode is calculated in the desired reduction calculation circuit 50 by use of the input and output reference values Gis and Gos set by an operator, and then, fed to the ARC preset length output circuit 75 as a constant.
  • the calculated input thickness Gis (AGC) and Gic (ARC) in the equations (6) and (5) are calculated in the reduction calculating circuits 71, 72 from the abovedescribed various data, i.e., the input thickness deviations AGi, the input length Li, the output length Lo, the output thickness reference value Gos and the desired rate or reduction r at every sampling length of the input pulse generator 11.
  • the output lengths Lo (AGC) and Lo (ARC) are detected by means of the pulse generator 21 of the touch roll 20 being in contact with the deflector roll 42 at the output side of the mill 8, passed through the AGC output length counter 22 and the ARC output length counter 23, respectively, and fed to the AGC output calculating circuit 71 and the ARC output calculating circuit 72 of the calculating circuit 70 as the digital or analog length signals Lo (AGC) and Lo (ARC).
  • (Gic-Gia) for both the AGC and ARC modes are calculated in these output calculating circuits 71, 72 and the error signals AX (AGC) and AX (ARC) are emitted.
  • Fig. 3 there.
  • error signals are fed to the output selecting circuit 77, and the error signals AX (AGC) fed from the AGC output calculating circuit 71 is fed to the comparator 76, where check is made whether the difference signal AX (AGC) fed from the calculating circuit 71 exceeds the level of the reference error value ⁇ Xs or not.
  • the output selecting circuit 77 feeds the error signal AX (AGC) fed from the AGC output calculating circuit 71 to the screwdown servo-mechanism 93 of the screwdown apparatus 90.
  • the error signal ⁇ X (AGC) does not reach the reference value ⁇ Xs
  • the error signal ⁇ X (ARC) is fed from the ARC output calculating circuit 72 to the screwdown servo-mechanism 93.
  • the electric- hydraulic servo-valve 92 controls the reduction action of the hydraulic cylinder 91 in a manner to diminish the error signal ⁇ X to zero at all times.
  • Adoption of the screwdown mechanism having a high responsibility such as an electro-hydraulic servo-system makes it possible to effect control of the positions of work rolls with high accuracy and high responsibility.
  • the actually measured thickness deviation AGo is obtained in the thickness deviation circuit 34 from the actually measured output thickness Go fed from the output thickness gauge 32 and the output thickness reference value Gos, a difference between the actually measured thickness deviation AGo and the calculated output deviation ⁇ Gi(1-r) is added by a suitable times n in the correction value calculating circuit 80, and, when the number of added times reaches a value n, the mean value of the times n is taken according to the equation (7) to obtain the correction value C, which is fed to the calculating circuit 70.
  • the estimated input thickness Gic is corrected according to the equation (8).
  • the abovedescribed calculation circuits or the shift register may be constituted by analog or digital circuits as in the illustrated embodiment, or may be constituted by computer systems.
  • Fig. 4 is a block diagram showing the general control system of the second embodiment, in which the method of automatically controlling the strip thickness according to the present invention is applied to a reversible rolling mill.
  • the abovedescribed second embodiment comprises:
  • a mode selection circuit 140 for feeding for the AGC mode the AGC error signal AX (AGC) fed from the AGC calculating circuit 120 or feeding for the ARC mode the ARC error signal AX (ARC) fed from the ARC calculating circuit 130; and
  • 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, and this signal is fed to the AGC calculating circuit 120 and the ARC calculating circuit 130, respectively.
  • the actually measured input thickness Gia is detected by means of the input strip thickness gauge 31 interposed between the deflector roll 41 and the positions of work rolls.
  • This actually measured input thickness Gia and the input thickness reference value Gis are fed to the input thickness deviation output circuit 33, where the input thickness deviation AGi is calculated and fed to the aforesaid calculating circuits 120 and 130, respectively.
  • the input and output thickness reference values Gis or/and Gos are likewise fed to the calculating circuits 120 and 130, respectively, where the aforesaid data are used to calculate the estimated input thickness Gic (AGC), Gic (ARC) through the aforesaid equations (6) and (5).
  • the output length Lo is likewise measured by means of the touch roll 20 provided on the center line of the deflector roll 42 disposed at the output side, the pulse generator 21 and the output length counter 11, and is fed to the calculating circuits 120 and 130, respectively.
  • the error signals AX (AGC), AX (ARC) between the aforesaid estimated input thickness Gic (AGC), Gic (ARC) and the actually measured input thickness Gia are calculated and fed to the mode selection circuit 140.
  • the mode selection circuit 140 includes a mode selection switch and a mode setter, according to the predetermined control modes for the respective modes, is adapted to feed for the AGC mode to error signal AX (AGC) and for the ARC mode the error signal AX (ARC) to the screwdown servo-mechanism 93 of the screwdown apparatus 90 to cause the hydraulic cylinder 91 to adjust the work rolls, through the electro-hydraulic servo-valve 92, so that the strip thickness can be controlled.
  • the input thickness deviation in this case is calculated from the input thickness fed from the thickness gauge 32 and the input thickness reference value by means of the thickness deviation output circuit 34, fed to the calculating circuits 120 and 130, respectively, and a control output for the control mode selected is given to the screwdown apparatus 90 in the same manner as aforesaid.
  • the aforesaid calculating circuits 120 and 130 may display the functions by use of only a computer system.
  • Table 1 shows one example of a rolling pass schedule according to the present invention.
  • the first pass is controlled in the AGC mode, and thereafter, the ARC mode and the AGC mode alternate for control.
  • a pass schedule of an even number the first and second passes are controlled in the AGC modes, and, from the third pass on, the ARC mode and the AGC mode alternate for control.
  • the former part of passes are controlled in the AGC mode, the latter part of passes except the last one are controlled in the ARC mode, and the last pass is controlled in the AGC mode, thus enabling to achieve the satisfactory results.
  • Fig. 5 shows the results of rollings in a plurality of passes by the relationship between the percentage of number of coils and percentage of coil lengths included within a strip thickness deviation of ⁇ 5 pm.
  • Fig. 5(a) shows the case where only the AGC modes are consequently used like in the prior art
  • Fig. 5(b) shows the case where the AGC and ARC modes are alternately used according to the present invention.
  • use of the method according to the present invention appreciably improves the accuracy in strip thickness, brings about the stability in quality, and moreover, improved productivity due to increased rolling speed.
  • Fig. 6 is a block diagram showing a third embodiment of the 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.
  • the abovedescribed third embodiment comprises:
  • 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 AGi thus obtained is fed to the input thickness deviation shift register 60.
  • the input thickness deviations AGi thus supplied are successively shifted in response to outputs from the input length counter 101, whereby the input thickness deviation AGi 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 AGi, the output thickness reference values Gos, and the desired rate of reduction r at every sampling length of the input pulse generator 11, an error signal AX (ARC) between the estimated input thickness Gic and the aforesaid actually measured input thickness Gia is 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 AX (ARC) to sero at all times.
  • the feedback mechanism 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 materials being rolled is similar to that in the aforesaid first embodiment, so that description thereof will be omitted.
  • the rate of reduction is usually represented by . (Gi-Go)/Gi.
  • the rate of reduction is easily obtained by calculating (Lo-Li)/ Lo from the actually measured lengths through the equation (2).
  • the recorder 160 and the indicator 161 respectively record or indicate the rate of reduction which has been calculated in the aforesaid calculating circuit 150.
  • the respective calculating circuits and shift register are constituted by analog or digital circuits as shown in the embodiment, but on the contrary, they may be constituted by a computer system.
  • Figs. 7 and 8 are recording charts showing the deviation of strip thickness and the rate of reduction in the case of applying the third embodiment of the present invention.
  • Fig. 7 shows an example where a test coil being of a trapezoidal shape and having a strip thickness of approx. ⁇ 10 pm 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 ⁇ 1.0% with respect to the desired value 9%.

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Claims (9)

1. Procédé de contrôle automatique de l'épaisseur de ruban dans un laminoir pour produire un produit laminé ayant une épaisseur voulue, dans lequel un mode de contrôle automatique de calibre (AGC) servant à réduire jusqu'à zéro l'écart par rapport à l'épaisseur de sortie voulue prédéterminée d'un matériau qui est laminé, et un mode de contrôle automatique de taux de réduction (ARC) servant à réduire jusqu'à une valeur prédéterminée le taux de réduction du matériau qui est laminé sont sélectionnés conformément aux conditions de laminage, de telle manière qu'un écart de référence de l'épaisseur de sortie du matériau qui est laminé par rapport à l'épaisseur calibrée uniforme, voulue et prédéterminée, est établi et le mode AGC mentionné ci-dessus est sélectionné quand un écart mesuré effectivement de l'épaisseur de sortie dépasse ledit écart de référence, et le mode ARC est sélectionné quand un écart mesuré effectivement de l'épaisseur de sortie n'atteint pas l'écart de référence.
2. Procédé de contrôle automatique de l'épaisseur de ruban dans un laminoir pour produire un produit laminé ayant une épaisseur voulue, dans lequel un mode de contrôle automatique de calibre (AGC) servant à réduire jusqu'à zéro l'écart par rapport à l'épaisseur de sortie voulue prédéterminée d'un matériau qui est laminé et un mode de contrôle automatique de taux de réduction (ARC) servant à réduire jusqu'à une valeur prédéterminée le taux de réduction du matériau qui est laminé sont sélectionnés pour des passages respectifs.
3. Procédé selon la revendication 2, dans lequel, dans le cas où le nombre total des passages est un nombre impair égal à trois on plus, le mode AGC est sélectionné pour un passage 1 et, pour un passage 2 et ensuite, le mode ARC et le mode AGC sont sélectionnés alternativement.
4. Procédé selon la revendication 2, dans lequel, dans le cas où le nombre total des passages est un nombre pair égal à quantre ou plus, le mode AGC est sélectionné pour un passage 1 et un passage 2, et pour un passage 3 et ensuite, le mode ARC et Is mode AGC sont sélectionnés alternativement.
5. Procédé selon la revendication 2, dans lequel le mode AGC est sélectionné pour la première partie des passages, le mode ARC est sélectionné pour la dernière partie des passages à l'exception du dernier passage, et le mode AGC est sélectionné pour le dernier passage.
6. Procédé selon l'un quelconque des revendications 1 à 5, dans lequel le mode ARC est adapté pour contrôler le taux de réduction de telle manière qu'une épaisseur de sortie du matériau qui est laminé est calculée à partir d'une épaisseur mesurée effectivement du matériau du côté de l'entrée du laminoir et du taux de réduction voulu en fonction du principe que le débit de masse de matériau qui est laminé est constant, une épaisseur d'entrée est estimée à partir de l'épaisseur de sortie ainsi calculée, d'une longueur d'entrée et d'une longueur de sortie, et une différence entre l'épaisseur d'entrée estimée et une épaisseur d'entrée mesurée effectivement peut être diminuée jusqu'à zéro.
7. Dispositif de contrôle automatique de l'épaisseur de ruban dans un laminoir, comprenant:
- un moyen de détection de longuéur d'entrée de mode AGC (10, 11, 12) pour détecter une longueur d'entrée d'un matériau qui est laminé pendant l'exécution d'un mode AGC;
- un moyen de détection de longueur d'entrée de mode ARC (10, 11, 13) pour détecter une longueur d'entrée du matériau pendant l'exécution d'un mode ARC;
- moyen de détection d'épaisseur d'entrée (31) pour détecter une épaisseur d'entrée mesurée effectivement du matériau;
- un circuit de sortie d'écart d'épaisseur d'entrée (33) pour fournir une différence entre l'épaisseur d'entrée mesurée effectivement provenant du moyen de détection d'épaisseur d'entrée et une valeur de référence d'épaisseur d'entrée;
-un registre à décalage d'écart d'épaisseur d'entrée (60) pour mémoriser les écarts d'épaisseur d'entrée provenant du circuit de sortie d'écart d'épaisseur d'entrée (33), pour décaler successivement ceux-ci conformément aux distances mesurées en réponse aux signaux de sortie du moyen de détection de longueur d'entrée, et pour fournir des données juste avant les positions des cylindres opérants;
- un circuit de sortie de réduction voulue (50) pour fournir un taux de réduction voulu qui est nécessaire pour le mode ARC;
- un moyen de détection de longueur de sortie de mode AGC (20, 21, 22) pour détecter une longueur de sortie du matériau pendant le mode AGC;
- un moyen de détection de longueur de sortie de mode ARC (20, 21, 23) pour détecter une longueur de sortie du matériau pendant le mode ARC;
- un circuit de calcul (70) comprenant:
- un circuit de sortie de longueur préréglée de mode AGC (74) pour fournir une longueur préréglée de mode AGC conformément à la valeur de référence d'épaisseur d'entrée au moyen de détection de longueur d'entrée de mode AGC;
- un circuit de sortie de longueur préréglée de mode ARC (75) pour fournir au moyen de détection de longueur d'entrée de mode ARC une longueur préréglée de mode ARC calculée à partir de la valeur de référence d'épaisseur d'entrée, de taux de réduction voulu provenant du circuit de sortie de réduction voulue (50) et de l'écart d'épaisseur d'entrée provenant du circuit de sortie d'écart d'épaisseur d'entrée (33);
- une porte (73) pour émettre un signal de sortie quand le moyen de détection d'entrée de mode AGC et le moyen de détection de longueur d'entrée de mode ARC ont tous les deux des détections complètes des longueurs pré- réglées;
- un circuit de calcul de sortie de mode AGC (71) pour déclencher un calcul en réponse à un signal de sortie de la porte (73), pour calculer une épaisseur d'entrée estimée du mode AGC à partir de la longueur d'entrée provenant du moyen de détection de longueur d'entrée de mode AGC, de la longueur de sortie provenant du moyen de détection de longueur de sortie de mode AGC et de la valeur de référence d'épaisseur de sortie, et pour fournir un signal d'erreur entre l'épaisseur d'entrée estimée et l'épaisseur d'entrée mesurée effectivement provenant du moyen de détection d'épaisseur d'entrée;
- un circuit de calcul de sortie de mode ARC (72) pour déclencher un calcul en réponse à une signal de sortie de la porte, pour calculer une épaisseur d'entrée estimée du mode ARC à partir de la longueur d'entrée provenant du moyen de détection de longueur de mode ARC, de la longueur de sortie provenant du moyen de détection de longueur de sortie de mode ARC; de l'écart d'épaisseur d'entrée juste avant les positions des cylindres opérants provenant du registre à décalage d'écart d'épaisseur d'entrée (60), de la valeur de référence d'épaisseur de sortie et du taux de réduction voulu provenant du circuit de sortie de réduction voulue (50), et pour fournir un.signal d'erreur entre l'épaisseur d'entrée estimée et l'épaisseur d'entrée mesurée effectivement provenant du moyen de détection d'épaisseur d'entrée;
- un comparateur (76) pour comparer un signal d'erreur de mode AGC provenant du circuit de calcul de sortie de mode AGC (71) à la valeur de référence d'écart;
un circuit de sélection de sortie (77) pour fournir le signal d'erreur de mode AGC provenant du circuit de calcul de sortie de mode AGC (71) quand le signal d'erreur dépasse l'écart de référence et pour fournir le signal d'erreur de mode ARC provenant du circuit de calcul de sortie de mode ARC (72) quant le signal de différence n'atteint pas l'écart de référence, en réponse à un signal de sortie du comparateur (76); et
- un dispositif de réduction (90) pour régler les positions des cylindres opérants en réponse à un signal de sortie du circuit de sélection de sortie (77) du circuit de calcul (70).
8. Dispositif selon la revendication 7, dans lequel un circuit de calcul de valeur de correction (80) est en outre inclus pour obtenir une valeur moyenne de la différence entre la valeur de référence d'épaisseur de sortie et l'épaisseur de sortie mesurée effectivement et pour fournir celle-ci comme une valeur de correction de réaction en vue de corriger une erreur pendant le mode AGC, et pour obtenir un écart d'épaisseur de sortie calculé à partie de l'écart d'épaisseur d'entrée provenant du circuit de sortie d'écart d'épaisseur d'entrée et du taux de réduction voulu provenant du circuit de sortie de réduction voulue (50) et pour fournir une valeur moyenne de la différence entre l'écart d'épaisseur de sortie calculé et l'écart d'épaisseur mesuré effectivement au circuit de calcul de réduction (70) comme une valeur de correction de réaction en vue de corriger une erreur pendant le mode ARC.
9. Dispositif selon l'une quelconque des revendications 7 et 8, dans lequel le circuit de sortie de réduction voulue (50) est conçu pour calculer le taux de réduction voulu à partir de la valeur de référence d'épaisseur d'entrée et de la valeur de référence d'épaisseur de sortie.
EP19810103238 1981-04-29 1981-04-29 Procédé et dispositif de commande automatique pour laminoirs Expired EP0063633B1 (fr)

Priority Applications (2)

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DE8181103238T DE3174969D1 (en) 1981-04-29 1981-04-29 Automatic control methods and devices for rolling mills
EP19810103238 EP0063633B1 (fr) 1981-04-29 1981-04-29 Procédé et dispositif de commande automatique pour laminoirs

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EP19810103238 EP0063633B1 (fr) 1981-04-29 1981-04-29 Procédé et dispositif de commande automatique pour laminoirs

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EP0063633B1 true EP0063633B1 (fr) 1986-07-23

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CN1040073C (zh) * 1989-12-25 1998-10-07 石川岛播磨重工业株式会社 轧机的板厚控制系统
US5101650A (en) * 1990-05-01 1992-04-07 Allegheny Ludlum Corporation Tandem mill feed forward gage control with speed ratio error compensation
DE19962183A1 (de) * 1999-12-22 2001-07-12 Siemens Ag Regeleinrichtung für ein- oder mehrgerüstige Walzstrassen
JP7528033B2 (ja) * 2021-07-06 2024-08-05 株式会社神戸製鋼所 圧延機の板厚制御装置および該方法ならびに圧延システム
JP7743158B2 (ja) * 2022-08-02 2025-09-24 株式会社神戸製鋼所 圧延機の自動板厚制御方法、および、圧延機の自動板厚制御装置
CN116274356A (zh) * 2023-03-03 2023-06-23 首钢智新迁安电磁材料有限公司 一种提升冷轧带钢成品厚度合格率的方法及存储介质

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US3237071A (en) * 1963-04-05 1966-02-22 Allis Chalmers Mfg Co Motor load distributing system for metal rolling mill
US3624369A (en) * 1969-08-04 1971-11-30 Ruloff F Kip Jr Thickness reduction control systems
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

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DE3174969D1 (en) 1986-08-28
EP0063633A1 (fr) 1982-11-03

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