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US3507134A - Interstand tension control for tandem cold rolling mills - Google Patents

Interstand tension control for tandem cold rolling mills Download PDF

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Publication number
US3507134A
US3507134A US707393A US3507134DA US3507134A US 3507134 A US3507134 A US 3507134A US 707393 A US707393 A US 707393A US 3507134D A US3507134D A US 3507134DA US 3507134 A US3507134 A US 3507134A
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Prior art keywords
speed
tension
stand
mill
stands
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Expired - Lifetime
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US707393A
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English (en)
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Antonio Vicente Silva
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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
    • B21B37/48—Tension control; Compression control
    • B21B37/52—Tension control; Compression control by drive motor control
    • 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

Definitions

  • the interstand tension is regulated to remain substantially constant by adjustment of the screwdowns when the rolling mill is running at low speeds such las thread speed or below.
  • the run speed of a rolling mill is in the order of 5000 feet per minute, the typical thread speed may be in the order of 10% of run speed or about 500 feet per minute.
  • the required screwdown adjustment may involve an appreciable movement by the screws in order to have any control effect over the interstand tension.
  • the screws can run any distance and no change in interstand tension will occur.
  • the interstand tension control here disclosed employs a combination of screwdown and stand speed ⁇ changes to obtain the desired substantially constant interstand tension regulation throughout the entire mill speed range. This is accomplished by providing an interstand tension sensing device, such as a tensiometer, between each pair of adjacent stands of the rolling mill and providing an actual interstand tension signal which is compared with a desired or reference interstand tension signal to generate an interstand tension error signal for each pair of stands.
  • an interstand tension sensing device such as a tensiometer
  • this tension error signal relative to each pair of lstands is supplied to the coarse speed regulator of one of that pair of adjacent stands, such as the preceding stand, to provide in plied to the coarse speed regulator of one ot that pair of adjacent stands, such asthe preceding stand, to provide in this manner a proper speed cone speed setting for that stand to reduce any interstand tension error and to maintain a substantially constant and desired interstand tension relationship between that pair of stands, regardless of the actual low operating speed of the mill at this time.
  • this interstandA tension error signal is removed from the coarse speedy stand regulator and is applied to this screwdown speed regulator or controller for the succeeding stand of the particular pair of stands being regulated to reduce the interstand tension error.
  • the speed cone of the rolling mill will at this time be established such that the operating speed of the rolling mill can increase to run speed without being subject to the undesired adjustment of the respective screws as previously described, and the mill should be subject to no objectionable disturbance in the now provided mill speed setup relationships, and the interstand tensions can now be maintained substantially constant as desired.
  • FIGURE l is a general illustration of the interstand tension control in accordance with the present invention applied, in the detailed example, to regulate the interstand tension between the second and third stands of a tandem rolling mill;
  • FIG. 2 illustrates in greater detail one suitable circuit arrangement provided for adjusting the interstand tension of the strip between the second and third stands of a tandem rolling mill;
  • FIG. 3 illustrates in greater detail the operation of the deadband gate shown in FIG. 2.
  • a thread speed bus can be energized to regulate the operating speeds of the individual stand drive motors in accordance with individually setreference speeds to provide a desired thread speed cone relationship, and this is done prior to the steel strip entering the first stand.
  • the thread speed is generally in the order of 10% of run speed, or for a mill having a runspeed of 5000 feet per minute in relation to the delivery speed of the strip from the last stand and entering the windup reel; the thread speed at this point would be in the order of 500 feet per minute.
  • the low mill speed of operation here considered is up to thread speed, and can be anywhere from zero speed to about 10% of the mill run speed, .and it generally applies to the initial portion of the total length of the strip that passes through the mill. It is desired in this regard to increase the total on gauge strip delivered from the mill even during this initial low speed of operation when the mill is being threaded and before the mill is energized by the master run bus to increase its operating speed up to the desired run speed of operation.
  • the mill setup for a given strip usually is changed for succeeding strips, if the succeeding strips do not have the same thickness and material characteristics as the previously run strip which passes through the mill.
  • the tension error signal is utilized below maximum thread speed for adjustment of the stand speed reference to initially establish the speed cone relationship as the strip passes through the succeeding pairs of stands of the rolling mill; and after this desired speed cone relationship is established and the strip has taken a few wraps on the windup reel and the mill is increased in speed above the maximum thread speed of operation, the stand speed regulators are no longer adjusted by the interstand tension error signal and only the screwdown controller is adjusted by this signal.
  • the control of the present invention has established the right speed cone relationship for the respective stands of the mill and the acceleration of the mill up to run -speed provides no problems in terms of excessive screwdown adjust-ment, and the position of the 'screwdowns at this point is proper as well as the speed regulation of the individual stand speed regulators.
  • a proper speed cone relationship at 100 or 200 feet per -minute is substantially the same as the speed cone relationship for the run speed of 5000 feet per minute.
  • DESCRIPTION OF THE PREFERRED EMBODIMENT is supplied from a potentiometer 18 to a second input of the tension regulator 16.
  • the latter tension regulator 16 is operative to provide a tension error signal by a difference comparison of the actual interstand tension signal received from the device 14 and the desired interstand tension signal received from the potentiometer 18, which error signal it applies through an initially closed contactor 20 to the stand speed regulator 22 provided for the coarse speed regulation of the drive motor 24 for the previous stand 10.
  • the contact 20 is closed below maximum thread speed, which is in the order of 10% of the run speed of about 5000l feet per minute for the rolling mill shown in FIG. 1.
  • a second contact 26 is normally open below the maximum thread speed.
  • the tension sensing device 30 is operative with a generally similar interstand tension regulation control 29 to control the drive motor for the first stand for mill operation below maximum thread speed and operative with the screw-down controller 31 for the second stand above maximum thread speed.
  • the tension sensing device 14 becomes operative to sense the interstand tension between the second and third stands.
  • the tension sensing device 32 is operative with a similar tension regulation control 33 to control the interstand tension between the third and fourth stand.
  • a tension sensing device 34 is operative with a similar control to control the interstand tension between the fourth and fifth stands.
  • the operator can now press a run speed button (not shown) which causes the drive motors of the respective stands to be energized in a well known manner by a run bus as compared to a thread bus, such that the operation of the mill accelerates from the thread speed to the run speed.
  • the speed cone relationship established as above described during the threading operation is retained in general during the acceleration and while the mill is operating at run speed.
  • FIG. 2 there is shown in greater detail the interstand tension control arrangement of the present invention including a master speed reference potentiometer operative through an operational amplifier 52 for energizing a bus 53 to control the pattern operating speed of all stands of the rolling mill.
  • a potentiometer 54 is operative with the first stand for providing a coarse speed adjustment function
  • a potentiometer 56 is operative with the second stand for providing a coarse speed adjustment of the operating speed of the second stand
  • a potentiometer 58 is operative to provide a coarse speed regulation of the third stand
  • a potentiometer 60 is operative to provide a coarse speed regulation of the fourth stand
  • a potentiometer 62 is operative to provide a coarse speed regulation of the fifth stand.
  • potentiometers 54, 56, 58, 60 and 62 are the coarse speed motor operated rheostats for the respective stands of the mill.
  • the signal from the actual tension sensing device 14 and the signal from the desired tension reference potentiometer 18 are summed together at a summing junction 70 operative with an operational amplifier 72 for providing an amplified tension error signal at output junction 74 which passes through a dead-band gate device 76, which will be described in greater detail in relation to FIG. 3.
  • a contact 78 is provided for manual operation of the rolling mill in that for the tension regulation control shown in FIGURE 2 to be properly operative the operator should observe that strip should be present between the second and third stands of the mill; otherwise the tension sensing device 14 will provide an erroneous signal.
  • the output signal from a roll force load' cell device 82 operative with the second stand can -be used in combination with the output signal from the roll force load cell device 80 of the third stand, for example in a well known AND gate 81, to provide an output signal through switch 85 only when strip is present between the stands two and three for the purpose of closing the contact 78 when this condition occurs.
  • the contact 20 is normally closed, for low speed operation of the rolling mill, to apply any tension error signal passing through the deadband gate 76 to an operational amplifier to energize the motor 92 for adjusting the position of the rheostat 5'6 which in turn is operative with the second stand speed controller for the purpose of adjusting the operating speed of the second stand in a direction to remove any tension error signal supplied at the output terminal 74 of the operational amplifier 72.
  • the function of the ⁇ deadband gate 76 is to prevent tension control in this manner by a small error signal less than about 2 or 3% of the tension reference value established by the potentiometer 18.
  • An error signal above 10% of the desired interstand tension value will pass through the deadband gate and be operative with the motor 92 to adjust the operating speed of the stand two. As long as the error is greater than 2 or 3%, the error signal is applied to the motor 92 to bring the tension error down to zero, and the error signal is continuously applied until the tension error drops to about 2 or 3% before the deadband gate will no longer pass the error signal to the amplifier 90.
  • the deadband gate 76 is operative in a similar manner relative to an opposite tension error signal.
  • each of the motor operator rheostats 54, 56, 58, 60 and 62 operative with the respective stands of the rolling mill, are initially preset manually to provide a desired speed cone relationship.
  • the tension regulating control of the present invention is operative to adjust these settings and change the operating speed of each particular stand drive motor in relation to the other stand motors, to thereby realign the speed relationship or speed cone settings of the respective motors as required to provide a substantially constant and desired interstand tension relationship between the respective adjacent stands of the rolling mill.
  • the bus 53 common to each of the stand speed rheostats has an increased voltage applied to it to thereby increase the operating speeds of the respective drive motors; however, the established relationship between those speeds is held constant as the voltage of the bus 53 increases to run speed value.
  • the tension control arrangement shown in F IG. 2 is therefore seen to be operative to adjust the speed setting of 'the potentiometer 56 operative with the drive motor for the second stand in relation to the speed settings of the potentiometers for the other drive motors.
  • an interstand tension control arrangement similar to that shown in FIG. 2 is provided for each of the interstand tension sensing devices 30, 14, 32 and 34 as shown in FIGURE.
  • the operator presses the run button and opens the contact 20 and closes the contact 26 for each stand tension control such that any existing tension error signals relative to the strip present between the respective stands is now supplied to the screwdown speed regulator operative with the screwdown controller of the next adjacent stand.
  • the contact 20 for each pair of stands is open such that the tension error signal supplied at the output of the tension error operational amplier is no longer operative to adjust the speed setting of the drive motor of the associated stand.
  • the deadband gate 76 is operative such that small errors do not result in changes of the settings of the respective stand speed rheostats since noise and other objectionable signals otherwise would result in undesired changes in the speed cone relationship and unstable operating conditions might result for the interstand tension control arrangement.
  • the deadband gate 76 is operative such that when the tension error signal is above the desired tension reference value by some predetermined amount, such as by an amount equivalent to about 10%, the full error signal is applied to the stand motor speed regulator. As the error signal is corrected and therefore decreases until it reaches a value in the order of 2%, the error signal is no longer applied to the speed regulator.
  • the contact 78 is used to manually load up the mill until some tension is present between the respective stands to be sensed by the tension sensing devices. Upon closing the contact 78 this causes the speed adjustment of the second stand motor to be such as to provide the desired interstand tension between the second and third stands.
  • Similar con trols successively operate for the respective interstand tensions between the iirst and second stand and then the second and third stand and then the third and the fourth stand and then the fourth and tifth stand such that, when the strip has entered the tension reel 36 and been Wrapped around a couple times, the desired speed cone relationship is established for the mill. After this the respective lscrewdown speed regulators can be energized by any remaining tension error signals.
  • the roll force signal from the second stand can determine the energization of the interstand tension control arrangement for the strip between the irst and second stands, and the roll force signal from the third stand to indicate that the strip has entered the third stand can be operative to energize and make operative the interstand tension control arrangement for the strip between the second and third stands, and so forth, as the strip passes through the mill and enters the fourth stand and then the fifth stand in succession.
  • a tachometer operative with the drive motor of the fifth stand can sense when the rolling mill is operative at maximum threadspeed or above and can be operative to deenergize the interstand tension regulating apparatus operative with the speed regulators and instead send the respective interstand tension error signals to the successive stand screwdown controllers, by energizing a relay 25 for each of the interstand regulators, operative to open the contact 20 and close the contact 26 and corresponding contacts for the other interstand tension regulators.
  • bistable amplier can be utilized for this purpose and which is not operative to switch its state of operation until a predetermined positive value input signal is applied to its input; it could be adjusted to indicate that the maximum thread speed of operation has been reached and the mill is operating at this level or above.
  • FIG. 3 there is illustrated in greater detail the operation of the deadband gate 76. It should be understood that the embodiment illustrated in FIG. 3 is not intended to limit the scope of the present invention but rather to provide one suitable illustration of an operative form of deadband signal gate device. In general, a deadband gate per se is well known to persons skilled in this art and there are several suitable devices available on the open market at the present time which would be suitable for this purpose. In FIG. 3 the elements corresponding to those shown in FIGURE l and FIGURE 2 have been given like reference numerals. The stand speed rheostats 54, 56, 58 and 60 are adjusted by the interstand tension regulating arrangement of the present invention.
  • the dead zone gate 76 to include four bistable amplifier circuits 100, 102, 104 and 106. These are respectively operative with the relay windings 107, 109, 111 and 113, for determining the operationv of the associated contacts 108, 110, 112 and 114. It is assured that a negative tension error is initially present from the start, and is present until strip is entered into the mill.
  • the tensiorneter device senses an interstand tension condition it applies an actual tension signal to input 15 of amplifier 72.
  • the tension reference signal provided by the potentiometer 18 is applied to input 19.
  • the error signal from the output of the ampliiier 72 is applied to one input of each bistable amplifier through conductor 21.
  • the contact 108 opened prior to the tension error being reduced to -l-2%.
  • the bistable amplier 106 closes contact 114 at a tension error of about 2% and the bistable amplier 102 closes contact at a tension error of about -l0%, such that the motor 92 is energized to increase the tension when the tension error becomes -l0% and is no longer energized when the tension error reaches 2%.
  • the bistable amplifiers including the associated relay per se are very well known devices and are available at the present time 9 in the open market as Westinghouse Electric Corporation catalog item P-801.
  • the interstand tension condition between the respective stands is succeedingly corrected as the strip passes through the mill from the rst stand to the windup reel such that if an indicator light were operative with the output of the bistable amplifier of each tension control arrangement, such as the bistable amplifier 100, this would indicate when the tension condition between the respective stands was such that it was less than positive 10% in error relative to the desired interstand tension condition; a similar light operative with the output of the bistable amplifier of each tension control arrangement, such as the bistable amplifier 102, would indicate that the actual tension condition was no greater than 5% negative 10% away from the desired interstand tension reference condition.
  • control arrangement in accordance with the present invention uses a combination of screwdown adjustment and stands speed changes to obtain the desired tension regulation between the stands throughout the entire mill speed range.
  • the tension error is not fed directly to the speed regulator of that stand but is fed instead to the speed controlling motor operated rheostat of that stand.
  • the tension error or difference between the desired tension and the actual interstand tension is sensed by the tension sensing device and is fed through a deadband gate to the motor operated rheostat for the number 2 stand.
  • the deadband has a hysteresis effect which means that the gate is closed to pass the error signal when the error is greater than a certain percentage of the desired tension condition and remains closed until the error is reduced to a predetermined lower value of the tension error condition.
  • This gate can be made to operate in a percent basis by using the tension reference signal as a bias to the provided tension error detection bistable amplifiers.
  • the tension regulator controls will change the position of the motor operated rheostats controlling the speed of each stand to obtain the desired interstand tension relationships as called for by the tension reference setting rheostats for the respective pairs of stands.
  • the tension regulator controls will change the position of the motor operated rheostats controlling the speed of each stand to obtain the desired interstand tension relationships as called for by the tension reference setting rheostats for the respective pairs of stands.
  • all the stands speeds should be at the appropriate values for the desired interstand tensions for the now existing screw positions and the tension errors should be reduced between the stands to substantially zero.
  • the speed cone of the mill will be correct for the existing screwdown settings. Since the speed correction for each stand has been made through the motor operated rheostat, when the mill is accelerated each stand will maintatin the correct relationship of speed to the other stands.
  • interstand tension for maintaining constant mass ow conditions between a given pair of stands by adjusting the speed and screwdown of either the previous or the succeeding stand.
  • the product of thickness hp and strip velocity vp of the previious stand should be made equal to the product of thickness hs and strip velocity vs of the succeeding stand; this can be done by raising the screwdown setting of the previous stand to increase hp or by increasing the previous stand speed vp to effectively reduce the tension between the stands; this can also be done by lowering the screwdown setting of the succeeding stand to reduce hs or by decreasing the succeeding stand speed vs to effectively reduce this same interstand tension.
  • the speed adjustment and screwdown adjustment can be applied together.
  • the teachings of the present invention can be utilized in conjunction with the well known X-ray gage coarse thickness control system applied to stand one and the X-ray gage Vernier thickness control system applied to stand five of the rolling mill.
  • control apparatus for a strip rolling mill having at least two successive stands of spaced roll members, the combination of strip tension sensing means responsive to the actual tension of said strip relative to the passage of said strip between said two stands,
  • spacing control means operative with the roll members of at least one of said stands to provide a desired spacing between the latter said roll members
  • ⁇ and thickness control means operative with said driving means and with said spacing control means for controlling the thickness of said strip in accordance with the difference between said actual tension and a desired strip tension between said stands, with said thickness control means being responsive to the speed of said strip passing between said stands to selectively operate in a predetermined manner with said driving means and with said spacing control means in accordance with said strip speed.
  • the control apparatus of claim 1, including lo is above said thread speed of said mill.
  • said thickness control means being responsive to the 6.
  • said thickness control maens being operative with 7.
  • said thickness control means being operative with said spacing control means of the second stand above said vpredetermined strip speed to control the spacing between the roll members of the second stand to reduce said tension difference.
  • said method including monitoring the actual tension of said strip material passf ing between a pair of said stands to determine the tension error in accordance with the diterence between a desired tension condition and the actual tenstands for a second range of said strip speed in accordance with said actual tension for controlling said actual tension.

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US707393A 1968-02-20 1968-02-20 Interstand tension control for tandem cold rolling mills Expired - Lifetime US3507134A (en)

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2143066A1 (de) * 1970-08-29 1972-03-09 Nippon Kokan Kk Verfahren zum Steuern der Zugspannung beim Kaltwalzen
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
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
US3808858A (en) * 1972-09-29 1974-05-07 J Connors Gage control system and method for tandem rolling mills
US3841124A (en) * 1971-10-11 1974-10-15 Hitachi Ltd Width controlling apparatus and method for rolled strips
US3848443A (en) * 1973-05-31 1974-11-19 Westinghouse Electric Corp Automatic control method and apparatus for a rolling mill
US3977223A (en) * 1974-04-02 1976-08-31 John Lysaght (Australia) Limited Hot strip mill tension control
US4087859A (en) * 1975-08-20 1978-05-02 Tokyo Shibaura Denki Kabushiki Kaisha Apparatus for measuring and controlling interstand tensions of continuous rolling mills
US4236216A (en) * 1977-04-28 1980-11-25 Tokyo Shibaura Denki Kabushiki Kaisha Control system of interstand tension of continuous rolling mills
FR2568496A1 (fr) * 1984-08-01 1986-02-07 Laminage Continu Ste Lorrai Me Procede et dispositif de reglage du synchronisme dans un laminoir a produit plat.
US4998427A (en) * 1989-11-29 1991-03-12 Aeg Westinghouse Industrial Automation Corporation Method for rolling on-gauge head and tail ends of a workpiece
US5012660A (en) * 1989-11-29 1991-05-07 Aeg Westinghouse Industrial Automation Corporation Control system and method for compensating for speed effect in a tandem cold mill
DE102010013387B4 (de) * 2009-04-01 2012-11-29 Hitachi, Ltd. Steuervorrichtung und -verfahren für ein Walzwerk
CN103266292A (zh) * 2013-05-24 2013-08-28 富科-思邦太阳能技术（太仓）有限公司 光伏焊带厚度控制装置及其厚度控制方法
CN114160588A (zh) * 2020-09-11 2022-03-11 宝山钢铁股份有限公司 用于不锈钢复合板轧制的翘扣头控制方法
CN114682631A (zh) * 2022-03-29 2022-07-01 北京首钢冷轧薄板有限公司 一种冷连轧机机架电流负荷的调节方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4533856A (en) * 1983-04-18 1985-08-06 Combustion Engineering, Inc. Submerged scraper conveyor automatic speed control

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3212310A (en) * 1962-05-31 1965-10-19 Armco Steel Corp Automatic gauge and tension control system
US3334502A (en) * 1962-12-24 1967-08-08 Siemens Ag Strip thickness control apparatus for a rolling mill
US3355918A (en) * 1965-05-12 1967-12-05 Westinghouse Electric Corp Gauge control system providing improved gauge accuracy in a reduction rolling mill

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3212310A (en) * 1962-05-31 1965-10-19 Armco Steel Corp Automatic gauge and tension control system
US3334502A (en) * 1962-12-24 1967-08-08 Siemens Ag Strip thickness control apparatus for a rolling mill
US3355918A (en) * 1965-05-12 1967-12-05 Westinghouse Electric Corp Gauge control system providing improved gauge accuracy in a reduction rolling mill

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3677045A (en) * 1968-11-19 1972-07-18 Nippon Kokan Kk Method of feed-forwardly controlling a tandem rolling mill
DE2143066A1 (de) * 1970-08-29 1972-03-09 Nippon Kokan Kk Verfahren zum Steuern der Zugspannung beim Kaltwalzen
US3688532A (en) * 1970-11-24 1972-09-05 Antonio Vicente Silva Control system for tandem rolling mill based on the constant volume principle
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
US3841124A (en) * 1971-10-11 1974-10-15 Hitachi Ltd Width controlling apparatus and method for rolled strips
US3808858A (en) * 1972-09-29 1974-05-07 J Connors Gage control system and method for tandem rolling mills
US3848443A (en) * 1973-05-31 1974-11-19 Westinghouse Electric Corp Automatic control method and apparatus for a rolling mill
US3977223A (en) * 1974-04-02 1976-08-31 John Lysaght (Australia) Limited Hot strip mill tension control
US4087859A (en) * 1975-08-20 1978-05-02 Tokyo Shibaura Denki Kabushiki Kaisha Apparatus for measuring and controlling interstand tensions of continuous rolling mills
US4236216A (en) * 1977-04-28 1980-11-25 Tokyo Shibaura Denki Kabushiki Kaisha Control system of interstand tension of continuous rolling mills
FR2568496A1 (fr) * 1984-08-01 1986-02-07 Laminage Continu Ste Lorrai Me Procede et dispositif de reglage du synchronisme dans un laminoir a produit plat.
US4998427A (en) * 1989-11-29 1991-03-12 Aeg Westinghouse Industrial Automation Corporation Method for rolling on-gauge head and tail ends of a workpiece
US5012660A (en) * 1989-11-29 1991-05-07 Aeg Westinghouse Industrial Automation Corporation Control system and method for compensating for speed effect in a tandem cold mill
DE102010013387B4 (de) * 2009-04-01 2012-11-29 Hitachi, Ltd. Steuervorrichtung und -verfahren für ein Walzwerk
CN103266292A (zh) * 2013-05-24 2013-08-28 富科-思邦太阳能技术（太仓）有限公司 光伏焊带厚度控制装置及其厚度控制方法
CN114160588A (zh) * 2020-09-11 2022-03-11 宝山钢铁股份有限公司 用于不锈钢复合板轧制的翘扣头控制方法
CN114682631A (zh) * 2022-03-29 2022-07-01 北京首钢冷轧薄板有限公司 一种冷连轧机机架电流负荷的调节方法
CN114682631B (zh) * 2022-03-29 2023-11-28 北京首钢冷轧薄板有限公司 一种冷连轧机机架电流负荷的调节方法

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BE728551A (da) 1969-08-01
GB1259309A (da) 1972-01-05
FR2002252A1 (da) 1969-10-17

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