US3808858A - Gage control system and method for tandem rolling mills - Google Patents

Gage control system and method for tandem rolling mills Download PDF

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Publication number
US3808858A
US3808858A US00294728A US29472872A US3808858A US 3808858 A US3808858 A US 3808858A US 00294728 A US00294728 A US 00294728A US 29472872 A US29472872 A US 29472872A US 3808858 A US3808858 A US 3808858A
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stand
stands
strip material
roll
gage
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US00294728A
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English (en)
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T Dolphin
J Cook
J Connors
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AEG Westinghouse Industrial Automation Corp
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Individual
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Priority to US00294728A priority Critical patent/US3808858A/en
Priority to CA179,628A priority patent/CA971777A/en
Priority to ES419088A priority patent/ES419088A1/es
Priority to JP48108585A priority patent/JPS5226511B2/ja
Priority to FR7334846A priority patent/FR2201139B1/fr
Application granted granted Critical
Publication of US3808858A publication Critical patent/US3808858A/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

Definitions

  • constant roll gap is main- 11 Claims, 3 Drawing Figures GAGE TENSION TENSION TENSION TENSION CONTROL CONTROL CONTROL CONTROL CONTROL GAGE TEN TEN TEN TEN 5i REF REF P REF REFl REF l F SPEED SPEED C3 ⁇ SPEED sPEEo SPEED CONTROL CONTROL CONTROL CONTROL v CONTROL G GE GAGE REF. CONTROL- MASTER SPEED CONTROL PATENTEDm nan j 3 08. 58
  • a gage control system for a tandem rolling mill wherein load cell means .are operativcly associated with each of at least those stands in the mill intermediate the first and last stands for producing an electrical signal for each stand which varies as a function of the roll force exerted by that stand.
  • Screwdown means are provided for each stand, which screwdown means may be of the mechanical type or, preferably, of the hydraulic cylinder type. Further means are provided for each of the intermediate stands and responsive to the electrical signal produced by its associated load cell means for adjusting the screwdown means to maintain constant a characteristic of the rolls in relation to the strip being rolled, assuming that interstand tension remains constant.
  • this characteristic which is maintained constant may be roll force or roll gap.
  • an attempt is made to maintain a constant roll gap on the first stand; while constant roll force is maintained'on all succeeding stands, including the last stand.
  • the roll force on the last stand can be varied depending upon a deviation in actual measured output gage from the desired output gage.
  • the roll force or roll gap control comprises an inner loop whose-reference signal can be modified by an outer loop responsive to either interstand tension or gage.
  • the outer loop is responsive to gage on the first stand; is responsive to tension on the intermediate stands; and is responsive to tension and/orfinal output gage on the last stand. If interstand tension or gage varies, so also will the inner loop reference signal and, hence, the roll force or gap.
  • FIG. 1 is a block schematic diagram of one embodiment of the invention wherein constant roll gap is maintained on the first stand of a rolling mill and constant roll force on succeeding stands;
  • FIG. 2 is an illustration of a typical operational amplifier utilized in the invention for combining signals proportional to actual tension, roll force, or roll. gap and comparing them with a reference signal; and
  • FIG. 3 illustrates an alternative embodiment (only one stand) of the invention wherein constant roll gap is maintained on stands succeeding the first stand in a tandem rolling mill.
  • the system shown includes a five-stand tandem rolling mill including stands S1, S2, S3, S4 and S5.
  • Each-stand includes a pair of work rolls l0 and 12 between which strip material 14 being rolled passes, together with a pair of backup rolls, not shown.
  • the strip issuing from the last stand S5 is wound on a coiler 15.
  • the rolls of each stand are driven by means of drive motors M1, M2, M3, M4 and M5 each controlled by speed control circuits Cl, C2, C3, C4 and C5, respectively.
  • the speed control circuits cl-CS are
  • a master speed controller 20 which establishes a nominal or desired speed for each of the stands in the mill to achieve a desired gage reduction.
  • the speed of the strip material issuing from any stand must be greater than that entering the stand in accordance with the constant volume principle. Accordingly, the speed of stand S2 must be greater than that of stand S1; the speed of stand S3 must be greater than that of stand S2; and so on the speed of stand S5 being the greatest.
  • the chocks supporting the rolls in each stand are loaded by means of hydraulic cylinders H1, H2, H3, H4 and H5, respectively. That is, the hydraulic cylinders Hl-H5 provide the necessary roll force to reduce the strip 14 in thickness. While only one cylinder is shown for each of the standsin the schematic illustration given, it will be understood that in actual practice there are hydraulic cylinders operating on two-chocks at either side of the mill. It is, of course, possible to use a mechanical screwdown mechanism or a wedge-type control to effect somewhat the same results; however,
  • the thickness of strip material passing through the first stand S1 is measured by means of an X-ray gage 22 or the like.
  • Gage 22 produces an electrical signal proportional to the actual gage of the strip material 14 between stands S1 and S2; and this signal is applied'to a gage control circuit 24 where it is compared with an electrical signal on lead 26 proportional to desired exit gage from stand 51. If the actual gage does not match by the hydraulic cylinder H1 to thereby correct for an off-gage condition until the actual measured gage as detected-by gage 22 matches the desired gage signal on lead 26.
  • tensiometers T1, T2, T3 and T4' which measure tension in the strip material between each set of stands.
  • the tensiometer T1 measures the tension between stands S1 and S2 and produces an electrical signal proportional thereto.
  • This tension signal from tensiometer T1 is compared with a tension reference signal on lead 32 in tension control circuit TC2. If the actual tension signal from tensiometer T1 does not match the tension reference signal on lead 32, then an error signal will be produced on lead 34 which is applied to a roll force control circuit RF2.
  • each of the stands 51-85 is a load cell or strain gage LCl, LC2, LC3, LC4 or LCS which measures the actual roll force exerted by the rolls 10 and 12 in each one of the stands.
  • the electrical signal produced by load cell LC 1 is multiplied by a factor K in multiplication circuit 36 to derive a signal on lead 38 which is proportional to the gap between the rolls I and 12. That is, in accordance with Hookes law, multiplication of the force exerted by the rolls times a constant, K, gives roll displacement or roll gap.
  • This is compared in the roll gap control circuit 30 with a roll gap reference signal on lead-40 which is proportional to the desired roll gap of stand S1 to achieve a predetermined gage.
  • the roll gap control circuit 30 will produce an error signal which, through appropriate hydraulic controls, not shown, will increase or decrease the pressure exerted by the cylinder H1 to increase or-decrease the roll gap of stand S1 until the reference and actual signals are the same.
  • Displacement of the piston within cylinder H1 is sensed by a suitable transducer 42 which produces an electrical signal proportional to the position of the cylinder and, hence, the amount of movement of one roll with respect to the other.
  • the roll force control system on stands S2-S5 is similar to the roll gap control of stand S1 except that in these cases, the actual roll force signal from load cell LC2 for stand S2, for example, is applied through lead 44 to the roll force control circuit RF2 where it is compared with a roll force reference signal on lead 46. Assuming that the actual roll force signal on lead 44 is not equal to the reference signal on lead 46, and assuming further that no error signal exists on lead 34, then an error signal will be produced at the output of circuit RF2 which, through appropriate hydraulic control circuitry, will either increase or decrease the pressure exerted by the cylinder H2 until the desired and actual roll force signals are the same.
  • a load cell such as cell LCl
  • the inner roll gap loop can be responsive to direct measurement of roll gap such as an LVDT device.
  • Stands S3, S4 and S have similar roll force control circuits RF3, RF4 and RF 5, respectively.
  • Stands S3 and S4 operate in the same manner as stand S2 with the output of the tension control circuit TC3 or TC4 changing the reference to the roll force control circuit RF3 or RF4, assuming that a tension correction is needed.
  • Stand S5 differs somewhat in that final output gage is measured by an X-ray gage 48 or the like and applied to a gage control circuit 50 where it is com-- pared with a signal on lead 52 proportional to desired, final output gage.
  • Applied to the speed control circuit C5 is a signal from the master speed regulator 20 proportional to the nominal speed of stand SS.
  • the signal from master speed regulator 20 will control and will cause the speed control-circuit C5 to drive stand S5 at the nominal speed determined by regulator 20. If, however, actual measured output gage and desired gage as represented by the signal on lead 52 are not the same, then the signal to speed control circuit C5 will be varied to either increase or decrease the speed of stand S5. This increases or decreases the tension between stands S4 and S5 to effect a gage correction.
  • final gage is controlled by controlling the speed of stand S5; while S4-S5 tension is controlled by stand S5 roll force. It should be understood, however, that final gage control can be by way of 54-85 tension; while tension control is by way of stand S5 speed. Alternatively, final gage control can be by way of stand S5 roll force; while tension control is by way of stand S5 speed.
  • each of the stands includes an innercontrol loop for maintaining constant either roll force or roll gap, and an outer control loop for maintaining either gage or tension constant.
  • gage control and roll gap control are used on the first stand S1 while constant roll force control and tension control are used on stands S2-S5.
  • roll force control on the first stand along with the other stands, or roll gap control on all stands are used on all stands.
  • the roll force control circuit RF2 is enclosed by broken lines and comprises a proportional operational amplifier 56 having a resistive feedback path 58.
  • the roll force reference signal on lead 46 is derived through resistor 60 from a po tentiometer 62.
  • the position of the movable tap on potentiometer 62 determines the desired roll force for stand S2. This can be accomplished manually or, in certain cases, can be accomplished by way of computer control.
  • Applied to the other input of the operational amplifier 56 through resistor 64 is the roll force signal from load cell LC2 on lead 44.
  • each stand will include a multiplying circuit 70, similar to circuit 36 of FIG. 1, where the roll force signal from a load cell LC2 is multiplied by the constant, K, to produce on lead 72 a signal proportional to roll displacement. This is compared in roll gap control circuit 74 with a roll gap reference signal derived via resistor 76 from potentiometer 78. At-the same time, tension to the second stand is measured by tensiometer T1 and applied to the tension control circuit TC2 along with a tension reference signal on lead 32.
  • a signal is applied tothe roll gap control circuit 74 where it modifies the reference signal derived from potentiometer 78 in the manner described above in connection with FIG. 2. Again, the position of the piston in cylinder H2 is converted into an electrical signal by means of transducer 80 and applied back to the roll gap control circuit 74 to completethe servo loop.
  • load cell means on each of at least those stands of the mill intermediate the first and last stands for producing an electrical signal for each stand which varies as a function of the roll force exerted by that stand
  • inner control loop means operatively associated with each intermediate stand and responsive to the electrical signal produced by its load cell means for adjusting said screwdown means to maintain constant a characteristic of the rolls in relation to the strip being rolled in the absence of a variation in'the tension in the strip entering a stand, and
  • outer control loop means associated with each intermediate stand and responsive to a variation in tension in strip entering a stand for varying said characteristic of the rolls until the tension is at a desired value.
  • the method of claim 8 including the step of measuring the roll gap of said first stand, and maintaining the roll gap of said first stand constant when the actual gage of strip material 'issuing'from the first standmatches the desired output gage of the first stand.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
US00294728A 1972-09-29 1972-09-29 Gage control system and method for tandem rolling mills Expired - Lifetime US3808858A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US00294728A US3808858A (en) 1972-09-29 1972-09-29 Gage control system and method for tandem rolling mills
CA179,628A CA971777A (en) 1972-09-29 1973-08-27 Gage control system and method for tandem rolling mills
ES419088A ES419088A1 (es) 1972-09-29 1973-09-26 Un sistema para control de calibre en un tren de laminado en tandem.
JP48108585A JPS5226511B2 (enrdf_load_stackoverflow) 1972-09-29 1973-09-28
FR7334846A FR2201139B1 (enrdf_load_stackoverflow) 1972-09-29 1973-09-28

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US00294728A US3808858A (en) 1972-09-29 1972-09-29 Gage control system and method for tandem rolling mills

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US3808858A true US3808858A (en) 1974-05-07

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US00294728A Expired - Lifetime US3808858A (en) 1972-09-29 1972-09-29 Gage control system and method for tandem rolling mills

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US (1) US3808858A (enrdf_load_stackoverflow)
JP (1) JPS5226511B2 (enrdf_load_stackoverflow)
CA (1) CA971777A (enrdf_load_stackoverflow)
ES (1) ES419088A1 (enrdf_load_stackoverflow)
FR (1) FR2201139B1 (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2836595A1 (de) * 1977-09-26 1979-03-29 Secim Courbevoie Fa Verfahren zur regelung der dicke eines flachen produkts waehrend des walzens und vorrichtung zur durchfuehrung des verfahrens
US4691546A (en) * 1982-11-11 1987-09-08 Davy Mckee (Sheffield) Limited Rolling mill control for tandem rolling
DE3843731A1 (de) * 1988-12-22 1990-06-28 Salzgitter Peine Stahlwerke Verfahren und vorrichtung zum warmbandwalzen
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
DE4243045A1 (en) * 1991-12-26 1993-07-01 Siemens Ag Controller form cold strip rolling system - matches stage roller forces, roller speed and strip tension to achieve constant strip thickness, with low axial force on strip
US7331154B2 (en) 2001-11-30 2008-02-19 Dole Food Company, Inc. Apparatus and method for sealing boxes
US20100193623A1 (en) * 2007-07-05 2010-08-05 Berthold Botta Rolling of a strip in a rolling train using the last stand of the rolling train as a tension reducer
US20100269556A1 (en) * 2007-06-11 2010-10-28 Arcelormittal France Method of rolling a metal strip with adjustment of the lateral position of a strip and suitable rolling mill
US20120004757A1 (en) * 2009-03-13 2012-01-05 Toshiba Mitsubishi-Electric Indus. Sys. Corp. Optimization device
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
US11351584B2 (en) * 2019-04-25 2022-06-07 Toyota Jidosha Kabushiki Kaisha Calibration determination device and calibration determination method for calibrating the tension of a bonding member

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3036480A (en) * 1957-07-10 1962-05-29 Electron Machine Corp Automatic control of multi-stand rolling mills
US3507134A (en) * 1968-02-20 1970-04-21 Westinghouse Electric Corp Interstand tension control for tandem cold rolling mills
US3531961A (en) * 1968-03-13 1970-10-06 Westinghouse Electric Corp Method and system for controlling strip thickness in a tandem reduction mill

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3036480A (en) * 1957-07-10 1962-05-29 Electron Machine Corp Automatic control of multi-stand rolling mills
US3507134A (en) * 1968-02-20 1970-04-21 Westinghouse Electric Corp Interstand tension control for tandem cold rolling mills
US3531961A (en) * 1968-03-13 1970-10-06 Westinghouse Electric Corp Method and system for controlling strip thickness in a tandem reduction mill

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2836595A1 (de) * 1977-09-26 1979-03-29 Secim Courbevoie Fa Verfahren zur regelung der dicke eines flachen produkts waehrend des walzens und vorrichtung zur durchfuehrung des verfahrens
US4187707A (en) * 1977-09-26 1980-02-12 Secim Thickness control method and apparatus for a rolling mill
US4691546A (en) * 1982-11-11 1987-09-08 Davy Mckee (Sheffield) Limited Rolling mill control for tandem rolling
DE3843731A1 (de) * 1988-12-22 1990-06-28 Salzgitter Peine Stahlwerke Verfahren und vorrichtung zum warmbandwalzen
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
DE4243045A1 (en) * 1991-12-26 1993-07-01 Siemens Ag Controller form cold strip rolling system - matches stage roller forces, roller speed and strip tension to achieve constant strip thickness, with low axial force on strip
US7331154B2 (en) 2001-11-30 2008-02-19 Dole Food Company, Inc. Apparatus and method for sealing boxes
US20100269556A1 (en) * 2007-06-11 2010-10-28 Arcelormittal France Method of rolling a metal strip with adjustment of the lateral position of a strip and suitable rolling mill
US8919162B2 (en) * 2007-06-11 2014-12-30 Arcelormittal France Method of rolling a metal strip with adjustment of the lateral position of a strip and suitable rolling mill
US20100193623A1 (en) * 2007-07-05 2010-08-05 Berthold Botta Rolling of a strip in a rolling train using the last stand of the rolling train as a tension reducer
US8676371B2 (en) * 2007-07-05 2014-03-18 Siemens Aktiengesellschaft Rolling of a strip in a rolling train using the last stand of the rolling train as a tension reducer
US20120004757A1 (en) * 2009-03-13 2012-01-05 Toshiba Mitsubishi-Electric Indus. Sys. Corp. Optimization device
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
US11351584B2 (en) * 2019-04-25 2022-06-07 Toyota Jidosha Kabushiki Kaisha Calibration determination device and calibration determination method for calibrating the tension of a bonding member

Also Published As

Publication number Publication date
FR2201139A1 (enrdf_load_stackoverflow) 1974-04-26
FR2201139B1 (enrdf_load_stackoverflow) 1978-11-10
ES419088A1 (es) 1976-07-01
CA971777A (en) 1975-07-29
JPS5226511B2 (enrdf_load_stackoverflow) 1977-07-14
JPS4993252A (enrdf_load_stackoverflow) 1974-09-05

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Owner name: AEG WESTINGHOUSE INDUSTRIAL AUTOMATION CORPORATION

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WESTINGHOUSE ELECTRIC CORPORATION;REEL/FRAME:005424/0551

Effective date: 19900313