US3852983A - Work strip gauge change during rolling in a tandem rolling mill - Google Patents

Work strip gauge change during rolling in a tandem rolling mill Download PDF

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Publication number
US3852983A
US3852983A US00354288A US35428873A US3852983A US 3852983 A US3852983 A US 3852983A US 00354288 A US00354288 A US 00354288A US 35428873 A US35428873 A US 35428873A US 3852983 A US3852983 A US 3852983A
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United States
Prior art keywords
gauge
roll stand
roll
stand
speed
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Expired - Lifetime
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US00354288A
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English (en)
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J Cook
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AEG Westinghouse Industrial Automation Corp
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Westinghouse Electric Corp
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Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US00354288A priority Critical patent/US3852983A/en
Priority to CA196,713A priority patent/CA1034665A/en
Priority to AR253423A priority patent/AR214382A1/es
Priority to FR7414191A priority patent/FR2227065B1/fr
Priority to IT41579/74A priority patent/IT1010800B/it
Priority to JP49047079A priority patent/JPS5013248A/ja
Priority to BE1005908A priority patent/BE814143A/xx
Application granted granted Critical
Publication of US3852983A publication Critical patent/US3852983A/en
Assigned to AEG WESTINGHOUSE INDUSTRIAL AUTOMATION CORPORATION reassignment AEG WESTINGHOUSE INDUSTRIAL AUTOMATION CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION
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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
    • B21B37/24—Automatic variation of thickness according to a predetermined programme
    • B21B37/26—Automatic variation of thickness according to a predetermined programme for obtaining one strip having successive lengths of different constant thickness

Definitions

  • ABSTRACT A control method and apparatus are disclosed for controlling the gauge of strip material being rolled by a Filedi P 1973 tandem rolling mill while the strip is in motion and [21] Appl No; 354,288 moving through the mill.
  • a gauge change in the work strip is accomplished by changing, in proper timed se- 1 quence, the stand speed and roll gap openings starting [52] U.S. Cl. 72/12, 72/24-() from the first t the last stand, In order to change [51] Int.
  • tandem rolling mill operation including respective X-ray gauge sensing devices operative for thickness control purposes after each of the first and last roll stands, with interstand control apparatus operative ahead of and providing roll opening control for each of the roll stands other than the first roll stand.
  • interstand control apparatus operative ahead of and providing roll opening control for each of the roll stands other than the first roll stand.
  • continuous rolling operation of a tandem mill is broadly discussed.
  • the rolling vmill is operated, when the work strip is passing through the successive roll stands of the rolling mill, such that a first X-ray gauge sensing device positioned after the first roll stand controls the roll opening of that first roll stand to effect a coarse gauge control of the work strip leaving that first roll stand, and a second X-ray gauge sensing device positioned after the last roll stand controls the speed of that last stand to effect a vernier gauge control of the work strip leaving that last roll stand.
  • a tension regulating device is positioned to sense the work strip interstand tension after each of the first, second, third and fourth roll stands and is operative respectively to control the roll opening of the following roll stand for maintaining the rolling mill operation in accordance with the well-known mass flow relationship:
  • H is the work strip delivery gauge leaving the first roll stand at speed 8
  • H is the work strip delivery gauge leaving the second roll stand at speed S and so forth.
  • this gauge change point movement can be established and followed in several ways, for example a weld detector can sense physically thegauge change point in the form of a welded joint in the work strip or a provided pulse generator and associated bridle roll arrangement can be operative with a pulse counter to sense the movement of the work strip and after a predetermined number of feet of incoming work strip have passed through the first roll stand in accordance with the first schedule it may be desired to effect a change to the second schedule operation when the predetermined gauge'change point of the work strip arrives at and enters the first roll stand.
  • a provided sequence control system prior to this event senses the work strip delivery gauge leaving the last roll stand and senses the operating speed of each roll stand, and then determines by mass flow considerations the work strip delivery gauges respectively leaving each of the first, second, third and fourth roll stands in accordance with the relationship of above equation (I).
  • the roll opening of that stand is changed by a predetermined amount by the sequence control system such that the delivery gauge of the work strip leaving the first roll stand is now in accordance with the desired second gauge schedule and since the work strip in accordance with the first schedule is still passing through the remaining subsequent roll stands the speeds of those remaining stands as well as the speed of the first stand are not changed.
  • the operating speed of the first roll stand is changed in accordance with the predetermined second schedule of operation, while the speed of the second rollstand is not changed since the work strip in accordance with the first schedule is still passing through the third, fourth and fifth roll stands, and the speeds of the third, fourth and fifth roll stands are not changed so as to continue the desired operation in accordance with the first gauge schedule.
  • the gauge change point of the work strip enters the third roll stand, the operating speeds of the previous first and second roll stands are changed in accordance with the second gauge schedule of operation, and the speeds of the third roll stand and the following roll stands are not changed since the work strip in accordance with the first gauge schedule is still operative with those roll stands.
  • the speeds of the previous first, second and third roll stands are changed in accordance with the second gauge schedule of operation, and the speeds of the fourth and fifth roll stands are not changed since the work strip in accordance with the first gauge change schedule is still operative with those roll stands.
  • the speeds of the previous first, second, third and fourth roll stands are changed in accordance with the second gauge schedule of operation, and the speed of the fifth roll stand is not changed.
  • FIG. 1 is a block schematic diagram of a tandem rolling mill and a gauge change sequence control system operative with that rolling mill in accordance with the present invention
  • FIG. 2 is a chart illustrating typical speed and work strip gauge or delivery thickness conditions as a gauge change point of the work strip passes through the roll stands 1 to of the rolling mill;
  • FIG. 3 is a chart illustrating the operation of the predetermined per unit multipliers to control the speeds of the roll stands in relation to the original gauge schedule and showing the progression of provided speed changes as the gauge change point of the work strip passes through the respective stands of the tandem rolling mill;
  • FIGS. 4A and 4B show a flow chart of a suitable instruction control program for a digital control computer included within the gauge change sequence control apparatus shown in FIG. 1.
  • the control system shown includes a five-stand tandem rolling mill having stands RS1, RS2, RS3, RS4 and RS5.
  • Each stand comprises a pair of work rolls 10 and 12, between which work strip material being rolled is passed. The associated backup rolls for each stand are not shown.
  • the strip issuing from the last stand RS5 is wound on a coiler 16, with the direction of strip movement being from left to right as indicated by the arrow 18 in FIG. 1.
  • each stand is driven by means of respective drive motors M1, M2, M3, M4, and M5 each controlled by a suitable speed control circuit C1, C2, C3, C4, and C5, respectively.
  • the speed of the material issuing from any stand must be greater than that entering the stand in accordance with the well-known constant volume principle of material mass flow. Accordingly, the speed of stand RS2 must be greater than the speed of stand RS1; the speed of stand RS3 must be greater than the speed of stand RS2, and so forth as well known to persons skilled in this art, with the speed of the last stand RS5 being the greatest.
  • gauge change sequence control 26 is connected to control each drive motor speed through operation of the respective speed controls. It will be understood that a reference speed signal is supplied to each of the respective speed controls C1 to C5 for this purpose.
  • each roll gap opening of each roll stand is determined by respective gap actuators G1, G2, G3, G4 and G5 as shown, and preferably including hydraulic cylinders, such that for each roll stand a hydraulic cylinder provides the necessary roll force at the stand to reduce the strip 14 in delivery gauge or thickness; and it will be understood that only one cylinder may be provided for each stand or there may be hydraulic cylinders on opposite sides of each mill stand, loading the chocks at the opposite ends of the work rolls.
  • a mechanical screwdown mechanism including an electrical screwdown motor can be used if desired to effect the required roll force at each stand, but the hydraulic cylinders may be preferred because of their more rapid speed of operation.
  • the delivery gauge of strip material passing through the first stand RS1 is measured by means of an X-ray gauge 28 or the like positioned at the delivery side of first stand RS1, which X-ray gauge 28 is operative in conjunction with the automatic gauge control system 30 to control the roll opening of roll stand RS1 to cause the gauge error leaving roll stand RS1 to be reduced to zero.
  • the automatic gauge control system 30 is operative with a gauge reference in accordance with the desired exit gauge from stand RS1.
  • automatic gauge control system 30 operates in conjunction with X-ray gauge 28 to either increase or decrease the roll opening of stand RS1 to increase or decrease the roll force of stand S1 and thereby vary the roll opening of stand RS1 and thereby vary the delivery gauge of the work strip material issuing from stand RS1 until the delivery gauge matches the desired reference gauge.
  • tension control device T1, T2, T3 and T4 which measures tension in the strip between each set of stands, such as the tension in the strip material 14 between stands RS1 and RS2, and produces an electrical signal proportional thereto.
  • This tension signal in relation to tension control T1 is compared with a tension reference signal in accordance with desired tension, and which may be supplied by the sequence control apparatus 26, and if the two are not the same, then the tension control device Tl will vary the pressure exerted by the gap actuator G2 for stand RS2, thereby varying the roll gap opening and/or the roll force of stand RS2.
  • Each tension control device measures a particular interstand tension and compares it with a desired reference tension, and if the two are not the same, then the roll gap opening for the succeeding stand is varied as required for work strip gauge correction.
  • the final delivery output gauge of the strip material passing through the tandem rolling mill is measured by means of an X-ray gauge 42 or the like, which produces an electrical signal proportional to the actual and measured output work strip gauge error. If the actual output gauge does not match the desired reference gauge, then the gauge error signal is applied to the speed control circuit C5 to increase or decrease as required the speed of drive motor MS of stand RS5, which in turn changes the tension between the last two stands to correct for the variation from thedesired delivery gauge. Ifthe correction is large enough to exceed the provided tension control dead band, the tension control device T4 will appropriately increase or decrease the roll gap of the last stand RS5 as required for correction of the interstand tension. In most cases, however, speed and tension control for varying final output gauge is desired on the last stand and the roll gap is changed only when the delivery gauge error is very large.
  • rolling mills of this general arrangement have in the past been generally operative to roll a continuous length of strip on a coil to a single specified thickness of delivery gauge along the entire length of the strip.
  • one or more delivery gauge changes can be effected during rolling of a single work strip, by initially changing the roll gap setting of the first stand RS1 to change thedelivery gauge of the strip material issuing from the first stand. Thereafter and in timed sequence, the respective control speed references of succeeding stands are changed until all roll gap settings and speeds of the stands in the mill have been set to accommodate the desired new delivery gauge. In this respect, it is necessary only to change the gauge references to the first stand RS1 and the X-ray gauge positioned after the first stand. For all other stands, it is necessary only to change the speed reference provided for the stand. The roll gap opening of each stand following the first stand is controlled and varied as required by means of the tension control devices T1 to T4.
  • the change from one delivery gauge to another is done in a way to preserve the required constant mass flow of work strip through the stands of the rolling mill for both the first delivery gauge schedule and the second delivery gauge schedule. Since the mill has no facility to store work stripmaterial between stands, the original mill setup was required to satisfy the mass flow relationship of above equation (1), where the product of the speed S times the strip delivery gauge or height H for each of the stands is equal to this same product for the-other stands. The thickness is decreased as it passes through each stand, so the speed increases to provide the wellknown constant volume flow operation.
  • the speed S of stand RS2 is shown to be the initial schedule value to satisfy the speed requirements of the first gauge or height schedule.
  • the new speed S for stand RS1 is chosen to satisfy the constant mass flow requirements of the second gauge or height schedule,
  • the reference stand speeds, roll openings, and interstand tensions are preset and adjusted to the desired work and deliver the required gauge out of the first stand and the last stand, and the gauge being delivered from each of the other stands is determined by the relationship between the stand speeds.
  • the speed pattern is directly related to the respective delivery gauges being produced, so the rolling schedule for each work strip is primarily established by the desired speed relationship pattern and the roll gaps and tensions are preset and adjusted to suit that desired speed relationship.
  • FIG. 2 there is provided a chart to illustrate typical sequential changes in the rolling mill operating conditions as a work strip gauge change point moves through the roll stands of that rolling mill.
  • the first gauge schedule operation with the first stand speed S (stand one and first schedule) equal to 446 and delivery gauge H equal to 0.085 being indicated, as well as the second stand speed 8 (stand two and first schedule) equal to 583 and delivery gauge H equal to 0.065, the third stand speed S equal to 758 and delivery gauge H equal to 0.050 and so forth.
  • the gauge change sequence control apparatus 26 When the gauge change point or transition of the work strip arrives at the first roll stand, the gauge change sequence control apparatus 26 as shown in FIG. 1 provides a different delivery gauge reference H (stand one and second schedule) to the automatic gauge control system 30 and the associated gap actuator G] of the first stand RS1, such that the delivery gauge H now equals 0.070.
  • the first stand speed S is still equal to 446 and the operational conditions for the remaining stands two through five stay the same.
  • the delivery gauge from the second stand now becomes H equal to 0.050.
  • the second stand speed remains the same, with S equal to 583, and the operating conditions for the subsequent third, fourth and fifth stands remain the same.
  • the gauge change sequence control apparatus provides adifferent speed reference to each of the first and second roll stands, such that the first stand speed S is equal to 390 and the second stand speed Sm is equal to 546.
  • the delivery gauge for the second schedule from each of the first and second roll stands remainsunchanged such that the first stand gauge H is equal to 0.070 and the second stand gauge H is equal to 0.050.
  • the tension control device T2 the delivery gauge from the third roll stand RS3 changes such that this gauge H is equal to 0.036.
  • the third stand speed S remains the same at 758, and the operating conditions for the fourth and fifth stands do not change.
  • the gauge change sequence control apparatus provides a different speed reference to each of the first, second and third stands, such that the first stand speed S is equal to 310, the second stand speed S is equal to 433 and the third stand speed S is equal to 602.
  • the delivery gauge from each of the first, second and third roll stands remains unchanged, such that the first stand gauge H is equal to 0.070, the second stand gauge H is equal to 0.050 and the third stand gauge H is equal to 0.036.
  • the tension control device T3 the delivery gauge from the fourth roll stand S4 changes such that this gauge H is equal to 0.024.
  • the fourth stand speed remains the same at 903 and the operations of the fifth stand do not change.
  • the gauge change sequence control apparatus provides a different speed reference to each of the first, second, third and fourth roll stands, such that the first stand speed S is equal to 286, the second stand speed S is equal to 400, the third stand speed S is equal to 555 and the fourth stand speed S is equal to 833.
  • the delivery gauges from respectively the first, second, third and fourth roll stands remain unchanged, however through operation of the tensioon control device T4 the delivery gauge from the fifth roll stand RS5 changes such that this gauge H is equal to 0.20.
  • the fifth stand speed S remains the same at 1000.
  • FIG. 3 there is provided a chart to illustrate the predetermined ratio multipliers that are utilized to establish the adjustments made in the previous stand speeds when the gauge change point of the work strip arrives at a particular roll stand. More specifically,
  • the speed of the first roll stand RS1 is adjusted by the multiplier (S )(H )/(S, )(H
  • the respective speeds of the first and second roll stands RS1 and RS2 are adjusted by the multiplier ai)( a2)/( 2i)( 22)- when the g g changepoint arrives at the fourth roll stand RS4
  • the respective speeds of the first, second and third roll stands RS1, RS2 and RS3 are adjusted by the multiplier (S,,)(H )/(S ,)(H
  • the respective speeds of the first, second, third and fourth stands RS1, RS2, RS3 and RS4 are adjusted by the ratio multiplier (S ,)(H )/(S )(H This completes the desired transition from rolling the work strip at the first gauge schedule
  • the initial first schedule is rolled on a five stand mill going from an input gauge of 0.l inch to a finished gauge of 0.038 inch, with the drafting pattern in the respective roll stands as shown.
  • the second gauge schedule of operation will roll the work strip from an input gauge of 0.100 inch to a delivery gauge of 0.020 inch leaving the mill.
  • the delivery speed from the fifth and lastroll stand RS5 is held constant at 1,000 feet per minute during the schedule change.
  • the second schedule parameters can be provided by the operator or determined by the control computer within the sequence control apparatus prior to the selected time for a gauge schedule change, and these parameter values will be stored in the computer memory or suitable storage locations until needed.
  • the various per unit speed multipliers as illustrated in FIG. 3 can then be determined before the gauge schedule change is started.
  • the speed of the first roll stand RS1 will be changed by the multiplier such that the speed of the first roll stand will be changed to (0.933) 446 416 FPM.
  • the speed of the first roll stand RS1 and the speed of the second roll stand RS2 will be changed by the multiplier 3i)( a2)/( 21)( 22) )/583)( r 0.937,
  • the control operation logic flow chart shown in FIG. 4 is illustrative of one suitable embodiment of the present invention is provided by operation of the sequence control apparatus.
  • a stored program digital computer could be utilized for this purpose if desired or a hardwired controlled apparatus could be provided if desired.
  • a determination is made from provided input information of the desired length of work strip in the first gauge schedule.
  • a counter is set with a predetermined count level to effect a desired slow down of the rolling mill operation to a selected transition speed just prior to the gauge change point of the work strip arriving at the first roll stand RS1.
  • the pulses from a pulse generator operative with the entry bridle or the delivery bridle positioned ahead of the first roll stand RS1, are counted to track the gauge change point movement, and when a predetermined slowdown initiate count is reached in the counter the rolling mill is decelerated to a selected transition speed at step 406.
  • a reading is made of the delivery gauge leaving the last roll stand RS5 through operation of the X-ray gauge device and the respective speeds of all the roll stands through operation of the pilot generator operative with each roll stand.
  • the gauge change point movement is tracked to arrive at the first roll stand RS1 through operation of perhaps a weld detector positioned a known distance ahead of the first roll stand to initiate counting of output pulses from the bridle roll pulse generator.
  • the first roll stand roll opening is adjusted from the first schedule delivery gauge H setting to the second schedule delivery gauge I'I setting.
  • the gauge reference for the X-ray gauge device 28 is changed to the second schedule gauge H
  • X-ray monitor operation provided by operation of the X-ray gauge device 42, is released from the first roll stand RS1, since the X-ray gauge device 42 is still operating with the first gauge schedule and the first roll stand is now operative with the second gauge schedule.
  • the gauge change point movement is tracked until arrival at the second roll stand RS2, through counting of output pulses from the pulse generator coupled with the first roll stand RS1.
  • the speed reference for the speed control C1 operative with the first roll stand RS1 is adjusted by the per unit multiplier shown in FIG.
  • the gauge change point movement is tracked to arrive at the third roll stand RS3, through counting of output pulses from the pilot generator coupled to the second roll stand RS2.
  • the speed references for the respective speed controls Cl and C2 are adjusted by the per unit multiplier shown in FIG. 3 such that the first and second roll stands are now operative at the desired speed relationship in accordance with the second gauge schedule.
  • the gauge change point movement is tracked to arrive at the fourth roll stand RS4, through counting of output pulses from the pilot generator coupled to the third roll stand RS3.
  • the speed references for the respective speed controls C1, C2 and C3 are adjusted by the per unit multiplier shown in FIG. 3 such that the first, second and third roll stands are now operative at the desired speed relationship in accordance with the second gauge schedule.
  • the gauge change point movement is tracked to arrive at the fifth roll stand RS5, through counting of output pulses from the pilot generator coupled to the fourth roll stand RS4.
  • the speed references for the respective speed controls C1, C2, C3 and C4 are adjusted by the per unit multiplier shown in FIG.
  • step 434 the rolling mill is' accelerated to a predetermined run speed of operation, and the control program then ends.
  • a gauge control system for a tandem rolling mill having a plurality of roll stands operative to reduce the gauge of a work strip having a gauge change point and being passed through said rolling mill, the combination of means for controlling the operating speed of a first roll stand, and means responsive to the work strip movement for sensing the arrival of said gauge change point at a second roll stand for providing a predetermined change in the operating speed of said first roll stand while maintaining the present operating speed of the second roll stand, with said predetermined change being in accordance with a relationship including the present operating speed of the second roll stand and the new desired work strip delivery gauge from at least one of said first and second roll stands.
  • the gauge control system of claim 1 including means for controlling the operating speed of said second roll stand, with said work strip movement responsive means sensing the arrival of said gauge change point at a third roll stand for providing desired changes respectively in the operating speed of said first roll stand and in the operating speed of said second roll stand while maintaining the present operating speed of the third roll stand, with said desired changes being in accordance with a second relationship including the present operating speed of the third roll stand and the new desired work strip delivery gauge from at least one of said second and third roll stands.
  • the gauge control system of claim 1 including means for determining the operating speed of each of said roll stands and the workstrip delivery gauge from each of said roll stands before said gauge change point arrives at said first roll stand.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US00354288A 1973-04-25 1973-04-25 Work strip gauge change during rolling in a tandem rolling mill Expired - Lifetime US3852983A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00354288A US3852983A (en) 1973-04-25 1973-04-25 Work strip gauge change during rolling in a tandem rolling mill
CA196,713A CA1034665A (en) 1973-04-25 1974-04-03 Work strip gauge change during rolling in a tandem rolling mill
AR253423A AR214382A1 (es) 1973-04-25 1974-04-23 Aparato variador de calibre de laminacion en un tren laminador en movimiento
IT41579/74A IT1010800B (it) 1973-04-25 1974-04-24 Dispositivo e procedimento per regolare lo spessore di un nastro in laminazione
FR7414191A FR2227065B1 (enrdf_load_stackoverflow) 1973-04-25 1974-04-24
JP49047079A JPS5013248A (enrdf_load_stackoverflow) 1973-04-25 1974-04-25
BE1005908A BE814143A (fr) 1973-04-25 1974-04-25 Dispositif de changement de calibre d'une bande en cours de laminage

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Application Number Priority Date Filing Date Title
US00354288A US3852983A (en) 1973-04-25 1973-04-25 Work strip gauge change during rolling in a tandem rolling mill

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US3852983A true US3852983A (en) 1974-12-10

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US00354288A Expired - Lifetime US3852983A (en) 1973-04-25 1973-04-25 Work strip gauge change during rolling in a tandem rolling mill

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US (1) US3852983A (enrdf_load_stackoverflow)
JP (1) JPS5013248A (enrdf_load_stackoverflow)
AR (1) AR214382A1 (enrdf_load_stackoverflow)
BE (1) BE814143A (enrdf_load_stackoverflow)
CA (1) CA1034665A (enrdf_load_stackoverflow)
FR (1) FR2227065B1 (enrdf_load_stackoverflow)
IT (1) IT1010800B (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4011743A (en) * 1976-04-20 1977-03-15 Westinghouse Electric Corporation Stand speed reference circuit for a continuous tandem rolling mill
US4335435A (en) * 1978-11-01 1982-06-15 Mitsubishi Denki Kabushiki Kaisha Method of changing rolling schedule during rolling in tandem rolling mill
US4878368A (en) * 1987-12-04 1989-11-07 General Electric Company Adaptive roll formed system and method
US4887343A (en) * 1987-05-29 1989-12-19 Fuji Photo Film Co., Ltd. Method and apparatus for roller leveler
US20080223100A1 (en) * 2005-05-11 2008-09-18 Corus Staal Bv Method and Apparatus for Producing Strip Having a Variable Thickness
IT202000000316A1 (it) * 2020-01-10 2021-07-10 Danieli Off Mecc Metodo ed apparato di produzione di prodotti metallici piani

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60196217A (ja) * 1984-03-16 1985-10-04 Sumitomo Light Metal Ind Ltd 金属管の連続圧延方法
CN114472544B (zh) * 2022-03-07 2023-06-16 宝钢湛江钢铁有限公司 热轧轧制间隙控制方法、系统、计算机设备及存储介质

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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
US3750437A (en) * 1970-03-07 1973-08-07 Nippon Kk Method and apparatus for controlling continuous tandem rolling mills
US3760621A (en) * 1970-08-26 1973-09-25 Nippon Kokan Kk Control method of tension in rolling mills (1)
US3762195A (en) * 1970-03-09 1973-10-02 Hitachi Ltd Thickness control apparatus for rolling mill

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3722244A (en) * 1970-03-07 1973-03-27 Nippon Kokan Kk Method of controlling continuous rolling of metal strips
US3750437A (en) * 1970-03-07 1973-08-07 Nippon Kk Method and apparatus for controlling continuous tandem rolling mills
US3762195A (en) * 1970-03-09 1973-10-02 Hitachi Ltd Thickness control apparatus for rolling mill
US3727441A (en) * 1970-03-16 1973-04-17 Hitachi Ltd Thickness control apparatus for rolling mill
US3760621A (en) * 1970-08-26 1973-09-25 Nippon Kokan Kk Control method of tension in rolling mills (1)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4011743A (en) * 1976-04-20 1977-03-15 Westinghouse Electric Corporation Stand speed reference circuit for a continuous tandem rolling mill
US4335435A (en) * 1978-11-01 1982-06-15 Mitsubishi Denki Kabushiki Kaisha Method of changing rolling schedule during rolling in tandem rolling mill
US4887343A (en) * 1987-05-29 1989-12-19 Fuji Photo Film Co., Ltd. Method and apparatus for roller leveler
US4878368A (en) * 1987-12-04 1989-11-07 General Electric Company Adaptive roll formed system and method
US20080223100A1 (en) * 2005-05-11 2008-09-18 Corus Staal Bv Method and Apparatus for Producing Strip Having a Variable Thickness
IT202000000316A1 (it) * 2020-01-10 2021-07-10 Danieli Off Mecc Metodo ed apparato di produzione di prodotti metallici piani
CN113102504A (zh) * 2020-01-10 2021-07-13 达涅利机械设备股份公司 生产扁平金属产品的方法和设备
WO2021140531A1 (en) * 2020-01-10 2021-07-15 Danieli & C. Officine Meccaniche S.P.A. Method and apparatus for producing flat metal products
US20230042075A1 (en) * 2020-01-10 2023-02-09 Danieli & C. Officine Meccaniche S.P.A. Method and apparatus for producing flat metal products
CN113102504B (zh) * 2020-01-10 2024-01-02 达涅利机械设备股份公司 生产扁平金属产品的方法和设备
US12064799B2 (en) * 2020-01-10 2024-08-20 Danieli & C. Officine Meccaniche S.P.A. Method and apparatus for producing flat metal products

Also Published As

Publication number Publication date
BE814143A (fr) 1974-10-25
FR2227065A1 (enrdf_load_stackoverflow) 1974-11-22
JPS5013248A (enrdf_load_stackoverflow) 1975-02-12
AR214382A1 (es) 1979-06-15
CA1034665A (en) 1978-07-11
FR2227065B1 (enrdf_load_stackoverflow) 1978-01-20
IT1010800B (it) 1977-01-20

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