EP0063633A1 - Verfahren und Vorrichtung zur automatischen Steuerung von Walzwerken - Google Patents

Verfahren und Vorrichtung zur automatischen Steuerung von Walzwerken Download PDF

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Publication number
EP0063633A1
EP0063633A1 EP19810103238 EP81103238A EP0063633A1 EP 0063633 A1 EP0063633 A1 EP 0063633A1 EP 19810103238 EP19810103238 EP 19810103238 EP 81103238 A EP81103238 A EP 81103238A EP 0063633 A1 EP0063633 A1 EP 0063633A1
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Prior art keywords
thickness
input
output
length
fed
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EP19810103238
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English (en)
French (fr)
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EP0063633B1 (de
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/de
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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 automatic control methods and devices for rolling mills, and particularly to automatic strip thickness control methods for obtaining a rolled product having a desired thickness by means of a Sendzimir mill for rolling an electrical steel sheet or stainless steel sheet, apparatuses for carrying out the methods, an automatic reduction rate control method for a rolling mill for rolling a material to be rolled at a predetermined rate of reduction, and an apparatus for carrying out the method.
  • the former 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. Namely, firstly, there is such a problem that, in the case the gain of the screwdcwi system is raised to improve the responsibility in controlling a loop system in the devices as described above, a hunting phenomenon due to an overshoot from the desired value in the reduction cylinder occurs, so that the accuracy in strip thickness is decreased as compared with the preceding pass.
  • 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 ⁇ 1 ⁇ + 2 ⁇ m, 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 AGC 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 E+10 ⁇ m, ⁇ 5 ⁇ m, 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.
  • 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 methods 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.
  • One of the objects of the present invention is, therefore, to provide a method of automatically controlling the strip thickness in a rolling mill, capable of overcoming the disadvantages of AGC and ARC, and bein excellent in the accuracy in strip thickness, responsibility and stability.
  • Another object of the present invention is to provide a method of automatically controlling the strip thickness in a rolling mill, capable of properly using an AGC mode and an ARC mode according to the condition of a material to be rolled.
  • Still another object of the present invention is to provide a method of automatically controlling the strip thickness in a rolling mill, wherein AGC mode passes and ARC mode passes are properly arranged in accordance with the process of rolling during rolling of plurality of passes, 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.
  • a further object of the present invention is 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 suitable for use as ARC in the abovementionedmethods of automatically controlling the strip thickness, and yet, being stabilized with high accuracy.
  • a still further object of the present invention is to provide a method of automatically controlling the rate of reduction, capable of obviating the steady variations from the desired value in the rate of reduction due to errors in measurement of the strip length, changes in strip width or the like in the abovementioned method of automatically controlling the rate-of reduction.
  • a yet further object of the present invention is to provide a device suitable for working the abovementioned methods of automatically controlling the strip thickness or the aforesaid method of automatically controlling the rate of reduction.
  • a still further object of the present invention is to provide devices for automatically controlling the strip thickness or a device for automatically controlling the rate of reduction, both of which do not require to set the desired rate of reduction.
  • a yet further object of the present invention is to provide a device for automatically controlling the rate of reduction, having reduction rate indicating means capable of indicating the rate of reduction by use of a simplified mechanism even when the position of a stickness gauge is apart from the positions of work rolls.
  • One of the abovedescribed objects can be achieved by that, in a method of automatically controlling the strip thickness in a rolling mill for producing a rolled product having a desired thickness, either an AGC mode for controlling a deviation of the output thickness of a material being rolled from the predetermined desired uniform gauge thickness to be diminished to zero or an ARC mode for controlling the rate of reduction of the material being rolled to a predetermined value is properly selected in accordance with the rolling condition.
  • one of the abovedescribed objects can be achieved by that a reference deviation of the output thickness of the material being rolled from the predetermined desired uniform gauge thickness is set, the aforesaid AGC mode is selected when an actually measured deviation of the output thickness exceeds the aforesaid reference deviation, and the aforesaid ARC mode is selected when an actually measured deviation of the output thickness does not reach the aforesaid reference deviation.
  • 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.
  • 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 does not reach the reference deviation, then ARC is used in contrast to the above. If this reference deviation is set at + 5 ⁇ m, then the accuracy of controlling within + 3 ⁇ m can be obtained after two or three passes, and a stabilized controlling of the strip thickness can be achieved.
  • one of the abovedescribed objects can be achieved by previously selecting for proper use either the AGC mode or the ARC mode for the respective passes.
  • 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.
  • a delay time L is present in the reduction system, if AGC is continuously used, then a large overshoot occurs as indicated by a symbol A in Fig. 1(d) for example, which causes an unsatisfactory strip thickness.
  • 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.
  • the output deviation indicated by broken lines in Fig. 1(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.
  • one of the abovedescribed objects can be achieved by that, in the case the total number of the passes is an odd number of three or more, the aforesaid AGC mode is selected for pass 1, and, for pass 2 and thereafter, the ARC mode and AGC mode are alternately selected.
  • one of the abovedescribed objects can be achieved by that, in the case the total number of the 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 alternately selected.
  • the AGC mode is selected for the former part of passes
  • the ARC mode is selected for the latter part of passes except the final pass
  • 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 calculat- cd, 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.
  • one of the abovedescribed objects can be achieved by that, in the method of automatically controlling the rate of reduction in a rolling mill for a material being rolled at a predetermined rate of reduction, the rate of reduction of 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 mass-flow rate of the material being rolled, an input thickness 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.
  • the aforesaid estimated input thickness is feedback corrected by a correction value obtained by adding and averaging a difference between a calculated output thickness deviation and an actually measured thickness deviation over a predetermined length of the material.
  • the 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 device for automatically controlling the strip thickness in a rolling mill comprising:
  • the device for automatically controlling the rate of reduction in a rolling mill comprising:
  • a correction value calculating circuit is further included for 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 calculating circuit as a feedback correction value
  • reduction indicating means is further included for indicating a rate of reduction calculated from the input length and output length.
  • the aforesaid desired reduction output circuit is made to calculate a 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 Gi, 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 Go an output thickness deviation. Consequently, in the case of control performed by ARC, the estimated input thickness Gic (ARC), when the equation (4) is substituted in the equation (2), is indicated by the following equation. Additionally, in the case of control performed by AGC, the estimated input thickness Gic (AGC) is indicated by the following equation.
  • the equations (5) and (6) show that, in both cases of control performed by ARC and AGC, the estimated input thickness Gic (ARC) and Gic (AGC) are obtainable from the rate of reduction r, the output thickness reference value Gos, the input thickness variation AGi, the input length Li and the output length Lo through calculation, respectively.
  • the aforesaid input thickness deviation Gi 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(1-r), the calculated output thickness thus obtained is compared with an actually measured output deviation Go, 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. 1 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
  • 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 different 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 andthe ARC output calculating circuit 72 of the calculating circuit 70 as the digital or analog length singnals Li (AGC) and Li (ARC).
  • AGC digital or analog length singnals Li
  • ARC Li
  • 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 ⁇ Gi 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 Gic (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 deviation ⁇ Gi, the input length Li, the output length Lo, der 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 ⁇ X (AGC) and ⁇ X (ARC) are emitted.
  • 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 ⁇ Go and the calculated output deviation AGi(l-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 strip thickness gauge for detecting an input thickness during reversing rollings and 34 a thickness deviation output circuit for calculating an input thickness deviation also during reversing rollings.
  • 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 ⁇ Gi 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. Namely, in a pass schedule of an odd number, the first pass is controlled in the AGC mode, and thereafter, the ARC mode and the AGC mode alternate for control. In 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. By this, both in the pass schedules of the oddand even numbers, the last pass is controlled in the AGC mode, and the pass immediately before last is controlled in the ARC mode, so that the accuracy in strip thickness can be improved with the increase in number of passes.
  • 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 the percentage of coil lengths included within a strip thickness deviation of + 5 ⁇ m.
  • 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 appre- cialy 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 ⁇ 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 (5) 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 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 ⁇ X (ARC) to zero 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 material 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 position of the thickness gauge is spaces apart from the position of rolling reduction, it is necessary to allow the material 6 to reach the thickness gauge disposed at the output side before the true rate of reduction can be obtained. Consequently, to use the strip thickness as the representation of the rate of reduction, the complicated mechanism like tracking system is necessary and the response become low. Therefore, in this invention 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 Lo - Li Lo which has been calculated in the aforesaid calculating curcuit 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 ⁇ m 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
EP19810103238 1981-04-29 1981-04-29 Verfahren und Vorrichtung zur automatischen Steuerung von Walzwerken Expired EP0063633B1 (de)

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Application Number Priority Date Filing Date Title
DE8181103238T DE3174969D1 (en) 1981-04-29 1981-04-29 Automatic control methods and devices for rolling mills
EP19810103238 EP0063633B1 (de) 1981-04-29 1981-04-29 Verfahren und Vorrichtung zur automatischen Steuerung von Walzwerken

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EP19810103238 EP0063633B1 (de) 1981-04-29 1981-04-29 Verfahren und Vorrichtung zur automatischen Steuerung von Walzwerken

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EP84107573.2 Division-Into 1981-04-29

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EP0063633A1 true EP0063633A1 (de) 1982-11-03
EP0063633B1 EP0063633B1 (de) 1986-07-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0435595A2 (de) * 1989-12-25 1991-07-03 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Dickenkontrollsystem für ein Walzwerk
EP0455382A1 (de) * 1990-05-01 1991-11-06 Allegheny Ludlum Corporation Verfahren zur Regelung der Bunddicke in einem Metallwalzwerk
EP1110634A2 (de) * 1999-12-22 2001-06-27 Siemens Aktiengesellschaft Regeleinrichtung für ein- oder mehrgerüstige Walzstrassen

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US3237071A (en) * 1963-04-05 1966-02-22 Allis Chalmers Mfg Co Motor load distributing system for metal rolling mill
DE2027249A1 (de) * 1969-06-06 1970-12-10 Allmänna Svenska Vlektriska Aktiebolaget, Västeras (Schweden) r O6.O6.69 Schweden 8043-69 Anordnung zur Bearbeitung von Material
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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Publication number Priority date Publication date Assignee Title
US3237071A (en) * 1963-04-05 1966-02-22 Allis Chalmers Mfg Co Motor load distributing system for metal rolling mill
DE2027249A1 (de) * 1969-06-06 1970-12-10 Allmänna Svenska Vlektriska Aktiebolaget, Västeras (Schweden) r O6.O6.69 Schweden 8043-69 Anordnung zur Bearbeitung von Material
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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0435595A2 (de) * 1989-12-25 1991-07-03 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Dickenkontrollsystem für ein Walzwerk
EP0435595A3 (en) * 1989-12-25 1991-12-18 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Thickness control system for a rolling mill
EP0455382A1 (de) * 1990-05-01 1991-11-06 Allegheny Ludlum Corporation Verfahren zur Regelung der Bunddicke in einem Metallwalzwerk
EP1110634A2 (de) * 1999-12-22 2001-06-27 Siemens Aktiengesellschaft Regeleinrichtung für ein- oder mehrgerüstige Walzstrassen
EP1110634A3 (de) * 1999-12-22 2003-03-12 Siemens Aktiengesellschaft Regeleinrichtung für ein- oder mehrgerüstige Walzstrassen

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EP0063633B1 (de) 1986-07-23
DE3174969D1 (en) 1986-08-28

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