US3531961A - Method and system for controlling strip thickness in a tandem reduction mill - Google Patents

Method and system for controlling strip thickness in a tandem reduction mill Download PDF

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US3531961A
US3531961A US712766A US3531961DA US3531961A US 3531961 A US3531961 A US 3531961A US 712766 A US712766 A US 712766A US 3531961D A US3531961D A US 3531961DA US 3531961 A US3531961 A US 3531961A
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stand
gauge
strip
mill
roll
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US712766A
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Lawrence W Dunn
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CBS Corp
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Westinghouse Electric Corp
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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

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  • This invention relates, in general, to a method and system for reducing the thickness of a material in a tandem rolling mill, and more particularly, to an adaptive automatic gauge control system used in a tandem cold rolling mill.
  • Cold mills are used to roll finished at products such as sheet and strip from hot rolled coils of steel or nonferrous metals. Cold rolling is necessary to reduce the material thickness to a desired value when the hot strip mill cannot adequately reduce the material to the gauge quality; or gauge tolerance required. As the demand has increased for lighter gauges and as users have demanded better quality uniformity and gauge tolerances, the cold mill has seen an increased importance. In addition, other advantages were achieved in vcold rolling such as a smoother and denser surface and the impartation of certain mechanical properties.
  • a number of rolling stands are placed in a line with the output of one stand serving as the input of the next and with each succeeding stand further reducing the strip thickness. It is well known under principles of mass flow and assuming a constant width strip that, if the thickness out of any stand is constant and if the speeds are maintained in the same relationship, then the thickness out of all of the other stands is held constant. Stated mathematically:
  • a further object of the present invention is to provide an improved method and system for controlling strip thickness by a process control computer which stores the strip error prole and initiates correction in a succeeding stand or stands.
  • Gauge deviations in a strip may be grouped generally into two categories-those inherent in the incoming strip, and those generated within the mill itself.
  • the hot rolled strip which is entering a cold reduction -mill is known to have inherent gauge deviations -which are a result of prior processing (usually in the hot strip mill) and which can be generally described as a function of the conditions that create them.
  • the foremost common types of incoming product errors are as follows:
  • the magnitude and frequency of these variations can be quite random; generally the magnitudes are relatively high.
  • a roll force automatic gauge control system has proven to have the most pronounced effect on correcting the errors described in paragraphs (l) and (2) above. However, it is less capable of correcting the type of errors described in paragraphs (3) and (4) due to the inherent time response of the system; i.e., by the time the system has recognized the error as the result of roll force change, the deviation or error has passed the point at which it could be corrected. It is, moreover, intentional that these high frequency and step change deviations are purposely ignored or filtered from the system.
  • a second feature of the present invention is a feed forward interstand tension automatic gauge ycontrol system which acts as a follow-up correction for thepreviously mentioned roll force automatic gauge control system for the type of errors described in paragraphs (l) and (2) as well as a primary system for the elimination of the errors described in paragraph (3) and to a large measure those errors described in paragraph (4). Due to its inherent operating nature, this system recognizes the error before its correction is necessory and then makes the correction in phase with its occurrence at the roll bite of the next stand.
  • this recalibration is accomplished by having a process computer periodically compare the expected effect of a screwdown correction to a roll force change with the actual effect measured by an X-ray gauge following the first stand in the rolling mill. Then, if the actual gauge differs from the expected gauge, the system gain is accordingly changed to account Ifor this difference.
  • gauge errors occur which vary as a function of the mill speed. These errors have been attributed mainly to back-up roll bearing oil film thickness changes although other factors are involved. As the mill speed increases, the bearing oil film builds up causing an assoicated reduction in strip thickness in a non-linear fashion. The reverse phenomenon occurs during mill deceleration. Those gauge errors introduced in this fashion tend to disturb the interstand tensions as well.
  • a further feature of the present invention is to employ an interstand tension control by screwdowns for the purpose of nullifying these effects. Operating in combination with the mill speed regulating system, the interstand tension control subsystem has the ability and capacity to reduce the gauge errors created by mill accelerations and decelerations to a level which a vernier automatic gauge control can effectively control.
  • FIG. l is a schematic representation of a five stand rolling mill arranged in accordance with the principles of the present invention.
  • FIG. 2 is a simplified schematic diagram of the rst three stands of the rolling mill of FIG. l wherein the stand 1 is dummied.
  • FIG. l a five stand tandem cold rolling mill is shown for successively reducing a strip 8 to a desired final gauge.
  • Each of the stands 1-5 includes a pair of work rolls 1GI and 12 driven by a motor 14. Motor speed is detected by a signal from a tachometer 32 connected to each drive motor. The speed of the drive motor is controlled through a speed controller which, for ease of illustration, has been shown only for stands 1, 4, and 5 by respective symbols S1, S4, and SS. Reduction on the strip 8 as it passes through work rolls 10 and 12 is achieved by applying a predetermined pressure through back rolls 16 and 18 by a screwdown 17.
  • the regulation of the applied pressure is through a screwdown motor 20 ⁇ whose operation is controlled by a screwdown controller 22.
  • a screwdown position detector 24 monitors the position of the screwdown 17 by detecting the revolutions of the screwdown motor 20.
  • the finished workpiece is then coiled on a reel 26 controlled by a drive motor M.
  • tensiometers 28 which indicate the interstand tension.
  • X-ray devices for measuring actual gauge are positioned between stands 1 and 2, stands 2 and 3, and stand 5 and the takeup reel 26, and are designated respectively by the symbols X1, X2 and X5.
  • a load Cell 30 which measures the roll force at the respective stand.
  • Control of the rolling process is provided by a process control computer 40 which provides communication between the rolling mill inputs and outputs in a predetermined manner.
  • the exact mode of control is provided by an externally provided program which functionally relates an input or combination of inputs to provide controlled output signals which are commensurate with an on-gauge strip.
  • the functional relationship between and among certain inputs as seen to exist within the process computer will be discussed in detail herein and are generally designated by the blocks within the process control computer 40.
  • the inventive combination to be further described is comprised of the combination of four subsystems which act together to provide an 'on-gauge finished workpiece.
  • the first subsystem is known as the entry or coarse correction AGC. It is the duty of this entry correction subsystem to remove the incoming strip gauge errors to thereby provide a constant strip gauge for reduction in the later mill stands.
  • This entry or coarse correction AGC is itself comprised of several components the first of which is designated as the stand No. 1 roll force AGC and designated by block 100.
  • the stand 1 roll force load cell 30 provides a gauge deviation signal with the process control computer 40 which relates a roll force change to a change in strip gauge.
  • This gauge deviation signal input along with a correction signal is then translated by the operation of the process control computer 40 in block 100 into an output correction signal to the stand 1 screwdown controller 22 which causes the screwdown 17 to change position at a rate, in a direction, and by an amount calculated to reduce this error to Zero.
  • a feedback signal is received from the screwdown position detector 24 at block 100 for monitoring the change in screwdown. The correction which occurs is as immediate as the system time response permits.
  • a second subsystem of the entry or coarse correction AGC is an interstand tension AGC by X-ray gauge feedforward monitoring.
  • the X-ray gauge X1 following stand 1 provides the process control computer 40 with a strip gauge error signal as shown in block 102 which the process control computer 40 stores in its memory section as an error profile.
  • the gauge error is mainly that which the stand 1 roll force AGC cannot eliminate or has been unsuccessful in eliminating.
  • the process control computer 40 also based on the measurement of stand 1 speed from the tachometer 32 can appreciate when a given error point in the strip is about to reach the stand No. 2 roll bite and then can initiate control of the stand 1 speed through speed controller S1 in a direction and by an amount necessary to create an interstand tension change which would then cause the strip error to be reduced to zero.
  • the advantage of this type of system is that by virtue of the fact that it is a feedforward system, the correction of the error is anticipated and the correction is made in phase with the occurrence of an error at the correcting point.
  • the X-ray gauge X1 is located as close as possible to stand 1.
  • the gauge will emit a deviation signal which is brought into the computer as shown in block 104 and stored in the computer memory as shown in yblock 102.
  • the process control computer 40 knows that at a particular point in time, such an error existed and the computer by virtue of the speed signal representing the speed of the strip between the stands from tachometer 32 of stand 1 will actually track the error in time until the point of error is about to reach the stand 2 roll bite.
  • the process control computer having delayed a correction until this time, then causes the stand 1 speed to be changed in the direction necessary to remove this error; theoretically, from a corrective standpoint, the correction to the error can best be handled when that error is in the roll bite of stand 2.
  • a serious fault with previous systems using an X-ray gauge monitor has been that the gauge deviation has been detected after the fact and a correction is made at the preceding stand.
  • the output of the X-ray gauge X1 would f be sampled at a very high frequency so that, in effect, an accurate profile of strip deviation over the entire length of the strip ca n be accomplished.
  • a third subsystem of the entry or coarse correction AGC is the entry system recalibration by X-ray gauge feedback monitoring.
  • the degree of correction necessary to erase an error by either the stand No. 1 roll force AGC or the interstand tension AGC by X-ray gauge feedforward monitoring is dependent on strip metallurgical properties and mainly hardness of the strip.
  • mill property changes such as roll heating, deformations, roll coolant changes, etc. also create variations in corrective requirements. Therefore, it is incumbent upon the process control computer 40 to adapt itself to instantaneous rolling conditions by monitoring effects of corrections it commands and by altering the degree of corrections, if necessary, to cause an on-gauge end product.
  • the first consists of the provision of a second input to the roll force AGC in block 100 wherein periodically the process control computer 40 monitors the strip gauge error signal from the X-ray gauge X1 following a command for a screwdown position change.
  • the process control computer 40 knows from the X-ray gauge signal X1 the change the screwdowns are required to make by getting a feedback of the actual gauge after the correction has been made; if the correction which is established does not give the expected result it alters the degree of cor- 6 rection made by the screwdowns.
  • the signal from the X-ray gauge X1 is fed into the signal mixer in block 104 which along with other inputsignals acts to provide a recalibration signal to the roll force AGC portion in block for providing a change in the screwdown position as previously described.
  • the second part consists of providing a correction signal to the interstand tension in block 102 AGC wherein the deviation signal from the X-ray gauge X2 located behind stand 2 is periodically monitored by the process control computer 40 as shown in the mixer block 108. If after a corrective tension change, the expected error reduction is not accomplished, the process control computer 40 then automatically increases or decreases the degree of correction necessary to rezero the system. This is shown by having the output from the mixer block 1-08 connected to block 102 which then alters the speed signal to speed controller S1 to provide a proper zero recalibration. Initially, the calibration of the previously described subsystems are based on a manual input of steel grade and hardness and/or the history of coils of the same order rolled before the one now in process.
  • the second subsystem employed in the total automatic gauge control system is an interstand tension control by screwdowns. T'he interstand tensions in the mill are regulated by controlling the screw positions of succeeding stands. When the tension goes beyond a pre-established set point dead-band as detected by the process control computer 40 from the respective signals from the interstand tensiometers 28 into the respective tension controllers 106, the process control computer causes the screwdowns on the succeeding stand to position by an amount and in a direction which will return the tension to its pre-established target value.
  • the tension control system will cooperate with the entry or coarse correction AGC and the delivery AGC tension subsystems such that when the entry tension AGC calls for an increasing of interstand tensioning between stands 1 and 2 to correct for an over-gauge strip condition and the tension required is excessive, the tension control will then operate to increase the roll pressure on the stand 2 primarly to reduce the tension between stands 1 and 2 and at the same time making the strip reduction which created the increase tension by the entry or coarse correction AGC system initially.
  • the third subsystem used in this automatic gauge control system is comprised of a delivery (Vernier) AGC system.
  • This vernier correction subsystem will remove the gauge errors which the previously described subsystems have been unable to successfully eliminate and, within limits, will also correct for improper mill setup or gauge deviations generated within the mill.
  • This delivery AGC system is comprised of two parts the first of which is an interstand tension AGC by X-ray gauge feedback monitoring.
  • a third X-ray gauge X is located on the delivery side of stand 5 which measures the delivered strip gauge and provides an output signal proportional to strip error into the delivery tension block 110.
  • the process control computer 40 then upon receiving this signal causes stands 4 and 5 and to a lesser but proportional degree stands 3 and 4 tensions to be changed through adjustment of the stand 5 and stand 4 speeds respectively at a rate by an amount and in a direction to reduce this error to zero. This is accomplished by providing a correction signal to speed controllers S4 and S5 from the delivery tension AGC block 110.
  • the second part of the delivery AGC system is used to detect trends and operates by a long term integration of the delivery gauge error trend.
  • the process control computer 40 monitoring the delivery X-ray gauge deviation signal from the X-ray gauge X5 and integrates this deviation in block 112 to recognize any trend toward an underor over-gauge condition over a predefined period of time and causes the entry AGC set point to be adjusted through mixer block 104 to reverse the trend by altering the degree of gauge correction made by the entry AGC subsystem.
  • This integrating type of subsystem will nullify and/or correct poor mill setup within limits and likewise insure that the delivery AGC subsystem has suicient range of correction for immediate gauge errors.
  • a correction of any magnitude made by the integrating system is spread across the mill as a result of the operation of the interstand tension control subsystem. For example, if the integrating subsystem detects an over-gauge tendency, it alters the entry AGC system target to produce a thinner gauge output. This causes a higher per unit interstand tension which in turn causes each succeeding stand screwdown to operate to increase the roll force and reduce gauge further. The net result is that increased mill loading because of the over-gauge trend is generally distributed in an even manner in each stand.
  • the fourth and last subsystem involved in the total AGC system is the strip head end/tail end compensation system. It is known that lack of strip tension during the mill threading process will cause the head end of the strip to be over-gauge as a function of the mill stiffness. As the strip tail end leaves each stand, strip tension between that and the following stand is lost which also results in an overgauge product. To offset these effects as much as possible, the following provisions are made in the system. For proper head end compensation, irnmedately after the entry of the strip into each stand, that stand screw position would be programmed and set to a roll opening of a value equal to that required to establish desired gauge output without the interstand tension.
  • the stand 1 roll force AGC system is activated. Then while the strip is traversing from stand 1 to stand 2, gauge output from the stand 1 would then be on target.
  • the roll opening will automatically reset as a function of the subsystem regulation to that value necessary to put out target gauge with the correct interstand tensions established.
  • the interstand tension control subsystems are sequentially activated and automatically adjust screw positions to create and maintain interstand tensions at their pre-established values. Simultaneous with the entering of stand No. 3 the entry tension AGC system is activated, and full entry gauge control is then in operation. The cycle is completed when the stand 5 is entered and the delivery AGC is then made operative.
  • the entry roll force AGC system is made inoperative because it would function in a direction which would oppose good gauge control.
  • the following sequence of operations would occur: (l) entry tension AGC system is deactivated, (2) the stand 1 and 2 tension control system is deactivated, (3) the stand 2-3 tension control system is deactivated, (4) the stand 2-3 interstand tension is increased a programmed and predetermined amount by reduction of the stand 2 speed. This last step is provided in order to overcome the loss of interstand tension between stands 1 and 2 and to maintain a target gauge once the workpiece is out of the stand 2. As the strip then leaves each succeeding stand the above steps (2), (3) and (4) are repeated for the proper stand involved. Then when the strip 8 leaves the stand 4, the delivery tension AGC system is deactivated.
  • the entry AGC subsystem is automatically revised to provide a coarse gauge control system without the stand 1 being involved.
  • the method of control that would be used is still the feedforward approach previously described except that instead of the primary control being by the interstand tension adjustments, stand 2 screwdowns are positioned at a rate, by an amount, and in a direction to reduce the gauge error to zero.
  • the strip error profile as measured by the X-ray gauge X1 following stand 1 is still stored in the process control computer memory and is held there until the erroneous strip then approaches stand 2.
  • the stand 2 screwdowns are operated to remove the anticipated off gauge strip as it enters the stand 2 roll bite.
  • the X-ray gauge X2 following stand 2 is then used to supply a gauge output signal Ato the process control computer 40 in mixer block 104 which is used to check the results of the corrective action taken and to then recalibrate the system if necessary.
  • a gauge control system comprising the combination of:
  • determining means for determining and effecting a change in unloaded roll opening of the rst rolling stand in response to the rst rolling stand roll force output signal, said determining means also including means responsive to the last rolling stand workpiece thickness signal for detecting over and under-gauge conditions over a predetermined time period and providing a correction signal representative thereof to said first stand roll force output signal.
  • tandem rolling mill control system as set forth in claim 1, said control system also including:
  • control system as set forth in claim 2 wherein said control system also includes:
  • control system includes means for effecting a predetermined level of interstand tension between predetermined rolling stands in response to Said last stand workpiece thickness signal.
  • determining and recording means include a digital computer system, said computer system having inputs coupled to said detecting and generating means, and outputs coupled to said speed and unloaded roll spinning controlling means, and a programming system for said computer system operative to make the speed and unloaded roll opening determinations.
  • tandem mill control system as set forth in claim 6, wherein said programming system includes a coarse correction control program which predictively determines a corrective unloaded roll opening at said first stand, and a first stand speed level in accordance with a second stand speed level to develop a predetermined interstand tension between said first and second stands at a level necessary to substantially remove previously uneliminated incoming gauge errors.
  • tandem mill control system as set forth in claim 7, wherein said programming system includes an entry calibration control program which recalibrates said first stand speed and unloaded roll opening in accordance with the degree of correction required in said coarse correction control program.
  • tandem mill control system as set forth in claim 8, wherein said entry recalibration system also includes recalibration of said first stand speed and unloaded roll opening in accordance with a detected trend of deviations of the last stand exit gauge of the workpiece.
  • tandem mill control system as set forth in claim 6, wherein said programming system includes a Vernier correction program system for determining speed of at least the two last stands to maintain an interstand tension level sufficient to remove previously uneliminated gauge errors.
  • a method for controlling a tandem Arolling mill having a plurality of rolling stands operative to successively reduce the thickness of a workpiece comprising the steps of detecting the roll force of at least one of said rolling stands and providing respective roll force output signals representing the roll forces detected, detecting the unloaded roll opening of at least said one of said rolling stands and providing respective position output signals corresponding to the respective unloaded roll openings of said stands, u

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US712766A 1968-03-13 1968-03-13 Method and system for controlling strip thickness in a tandem reduction mill Expired - Lifetime US3531961A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650135A (en) * 1968-06-14 1972-03-21 British Iron Steel Research Control for rolling means having successine rolling stands
US3677045A (en) * 1968-11-19 1972-07-18 Nippon Kokan Kk Method of feed-forwardly controlling a tandem rolling mill
US3688532A (en) * 1970-11-24 1972-09-05 Antonio Vicente Silva Control system for tandem rolling mill based on the constant volume principle
US3704609A (en) * 1971-06-25 1972-12-05 Westinghouse Electric Corp Rolling mill gauge control during acceleration
US3722244A (en) * 1970-03-07 1973-03-27 Nippon Kokan Kk Method of controlling continuous rolling of metal strips
US3727441A (en) * 1970-03-16 1973-04-17 Hitachi Ltd Thickness control apparatus for rolling mill
US3744287A (en) * 1971-09-14 1973-07-10 Westinghouse Electric Corp Hydraulic interstand tension regulating and automatic gauge control system for multi-stand rolling mills
US3782151A (en) * 1972-02-29 1974-01-01 Westinghouse Electric Corp Automatic gauge control system for tandem rolling mill
US3808858A (en) * 1972-09-29 1974-05-07 J Connors Gage control system and method for tandem rolling mills
US3996776A (en) * 1974-03-05 1976-12-14 Gec-Elliott Automation Limited Strip thickness control
US4016735A (en) * 1975-09-23 1977-04-12 Westinghouse Electric Corporation Range control for an automatic gauge control system of a rolling mill
US4236216A (en) * 1977-04-28 1980-11-25 Tokyo Shibaura Denki Kabushiki Kaisha Control system of interstand tension of continuous rolling mills
US4286447A (en) * 1979-03-12 1981-09-01 Westinghouse Electric Corp. Method and apparatus for automatic gauge control system for tandem rolling mills
US4513594A (en) * 1983-08-22 1985-04-30 Tippins Machinery Company, Inc. Method and apparatus for combining automatic gauge control and strip profile control
EP0175844A2 (de) * 1984-09-26 1986-04-02 Hoesch Stahl Aktiengesellschaft Verfahren und Vorrichtung zur Korrektur des Dickenprofils des zu walzenden Bandes an einer mehrgerüstigen Warmbandstrasse
US20070068210A1 (en) * 2005-09-29 2007-03-29 University Of Pittsburgh - Of The Commonwealth System Of Higher Education System for controlling a rolling mill and method of controlling a rolling mill
US20130253692A1 (en) * 2010-12-01 2013-09-26 Hans-Joachim Felkl Method For Actuating A Tandem Roll Train, Control And/Or Regulating Device For A Tandem Roll Train, Machine-Readable Program Code, Storage Medium And Tandem Roll Train
US9095886B2 (en) 2011-06-27 2015-08-04 University Of Central Florida Research Foundation, Inc. Mill control system and method for control of metal strip rolling
US20210346927A1 (en) * 2016-12-30 2021-11-11 Outokumpu Oyj Method for manufacturing flexible rolling of metal strips

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112139257B (zh) * 2020-08-28 2022-06-24 北京科技大学设计研究院有限公司 一种轧机绝对设备位置零调的校对方法

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US3232084A (en) * 1961-04-13 1966-02-01 Davy & United Eng Co Ltd Mill control systems
US3328987A (en) * 1964-05-14 1967-07-04 Crucible Steel Co America Gage-control apparatus
US3355918A (en) * 1965-05-12 1967-12-05 Westinghouse Electric Corp Gauge control system providing improved gauge accuracy in a reduction rolling mill
US3416339A (en) * 1966-12-30 1968-12-17 Bethlehem Steel Corp Automatic control system for rolling mills
US3448600A (en) * 1967-02-01 1969-06-10 Gen Dynamics Corp Thickness reduction control system

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
US3232084A (en) * 1961-04-13 1966-02-01 Davy & United Eng Co Ltd Mill control systems
US3328987A (en) * 1964-05-14 1967-07-04 Crucible Steel Co America Gage-control apparatus
US3355918A (en) * 1965-05-12 1967-12-05 Westinghouse Electric Corp Gauge control system providing improved gauge accuracy in a reduction rolling mill
US3357217A (en) * 1965-05-12 1967-12-12 Westinghouse Electric Corp Slave gauge control system for a rolling mill
US3416339A (en) * 1966-12-30 1968-12-17 Bethlehem Steel Corp Automatic control system for rolling mills
US3448600A (en) * 1967-02-01 1969-06-10 Gen Dynamics Corp Thickness reduction control system

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650135A (en) * 1968-06-14 1972-03-21 British Iron Steel Research Control for rolling means having successine rolling stands
US3677045A (en) * 1968-11-19 1972-07-18 Nippon Kokan Kk Method of feed-forwardly controlling a tandem rolling mill
US3722244A (en) * 1970-03-07 1973-03-27 Nippon Kokan Kk Method of controlling continuous rolling of metal strips
US3727441A (en) * 1970-03-16 1973-04-17 Hitachi Ltd Thickness control apparatus for rolling mill
US3688532A (en) * 1970-11-24 1972-09-05 Antonio Vicente Silva Control system for tandem rolling mill based on the constant volume principle
US3704609A (en) * 1971-06-25 1972-12-05 Westinghouse Electric Corp Rolling mill gauge control during acceleration
US3744287A (en) * 1971-09-14 1973-07-10 Westinghouse Electric Corp Hydraulic interstand tension regulating and automatic gauge control system for multi-stand rolling mills
US3782151A (en) * 1972-02-29 1974-01-01 Westinghouse Electric Corp Automatic gauge control system for tandem rolling mill
US3808858A (en) * 1972-09-29 1974-05-07 J Connors Gage control system and method for tandem rolling mills
US3996776A (en) * 1974-03-05 1976-12-14 Gec-Elliott Automation Limited Strip thickness control
US4016735A (en) * 1975-09-23 1977-04-12 Westinghouse Electric Corporation Range control for an automatic gauge control system of a rolling mill
US4236216A (en) * 1977-04-28 1980-11-25 Tokyo Shibaura Denki Kabushiki Kaisha Control system of interstand tension of continuous rolling mills
US4286447A (en) * 1979-03-12 1981-09-01 Westinghouse Electric Corp. Method and apparatus for automatic gauge control system for tandem rolling mills
US4513594A (en) * 1983-08-22 1985-04-30 Tippins Machinery Company, Inc. Method and apparatus for combining automatic gauge control and strip profile control
EP0175844A2 (de) * 1984-09-26 1986-04-02 Hoesch Stahl Aktiengesellschaft Verfahren und Vorrichtung zur Korrektur des Dickenprofils des zu walzenden Bandes an einer mehrgerüstigen Warmbandstrasse
EP0175844A3 (en) * 1984-09-26 1987-01-14 Hoesch Stahl Aktiengesellschaft Method and device for correcting the thickness profile of a hot rolled strip in a multiple-stand rolling mill
US20070068210A1 (en) * 2005-09-29 2007-03-29 University Of Pittsburgh - Of The Commonwealth System Of Higher Education System for controlling a rolling mill and method of controlling a rolling mill
WO2007041179A2 (en) * 2005-09-29 2007-04-12 University Of Pittsburgh - Of The Commonwealth System Of Higher Education System for controlling a rolling mill and method of controlling a rolling mill
WO2007041179A3 (en) * 2005-09-29 2007-10-11 Univ Pittsburgh System for controlling a rolling mill and method of controlling a rolling mill
US20130253692A1 (en) * 2010-12-01 2013-09-26 Hans-Joachim Felkl Method For Actuating A Tandem Roll Train, Control And/Or Regulating Device For A Tandem Roll Train, Machine-Readable Program Code, Storage Medium And Tandem Roll Train
US9638515B2 (en) * 2010-12-01 2017-05-02 Primetals Technologies Germany Gmbh Method for actuating a tandem roll train, control and/or regulating device for a tandem roll train, machine-readable program code, storage medium and tandem roll train
US9095886B2 (en) 2011-06-27 2015-08-04 University Of Central Florida Research Foundation, Inc. Mill control system and method for control of metal strip rolling
US20210346927A1 (en) * 2016-12-30 2021-11-11 Outokumpu Oyj Method for manufacturing flexible rolling of metal strips
US11865598B2 (en) * 2016-12-30 2024-01-09 Outokumpu Oyj Method for manufacturing flexible rolling of metal strips

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BE729598A (xx) 1969-08-18
FR2003835A1 (xx) 1969-11-14
JPS518826B1 (xx) 1976-03-22
GB1264546A (xx) 1972-02-23

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