US3760621A - Control method of tension in rolling mills (1) - Google Patents

Control method of tension in rolling mills (1) Download PDF

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Publication number
US3760621A
US3760621A US00176766A US3760621DA US3760621A US 3760621 A US3760621 A US 3760621A US 00176766 A US00176766 A US 00176766A US 3760621D A US3760621D A US 3760621DA US 3760621 A US3760621 A US 3760621A
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United States
Prior art keywords
signal
strip
width
tensile stress
generating
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Expired - Lifetime
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US00176766A
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English (en)
Inventor
S Fujii
M Kamata
M Ishida
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JFE Engineering Corp
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Nippon Kokan Ltd
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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 1 orelgn pphcatmn Pnomy am In a cold tandem mill of the endless type, means are Aug. 26, I970 Japan 45/74281 provided to maintain the strip tension constant while the cross-section of the strip undergoes a change in E2 size, that is, as the thickness, the width or the desired ll. fth h 581 Field oiSearch., 72/8, 9, 10, 11, 6 0 e S ange 72/12 1 19 10 Claims, 4 Drawing Figures THICKNESS SIGNAL WIDTI-I S IGNAL 4 MULTIPLIEIZ-- CROSS-SECTIONAL IO AREA SIGNAL. ⁇
  • FIG. 4 THICKNESS swNAL WIDTH SlGNAL SIGNAL m MEASURED TOTAL TENSI TENSION/ TENSION sncmm. CONTROLLER summme POINT Iz DEVlATlON SIGNAL CONTROL METHOD OF TENSION IN ROLLING MILLS (1)
  • THICKNESS swNAL WIDTH SlGNAL SIGNAL m MEASURED TOTAL TENSI TENSION/ TENSION sncmm.
  • CONTROLLER summme POINT Iz DEVlATlON SIGNAL CONTROL METHOD OF TENSION IN ROLLING MILLS
  • the present invention is directed to a control method for maintaining a constant tension per cross sectional area of a strip (referred to as constant tensile stress) during the rolling process even when the plate thickness and/or width is changed during rolling of strips.
  • tensile stress is the tension per cross sectional area (hereinafter referred to as tensile stress).
  • tensile stress the tension per cross sectional area
  • the total tension of the strip is obtained, generally, by multiplying the tensile stress by the plate thickness and by the width:
  • T stands for total tension, 1 fortensile stress, h for strip thickness and w for strip width.
  • FIGS. 1 to 4 show block diagrams of preferred embodiments of tension control in accordance with the present invention.
  • FIG. 1 is a block diagram showing one embodiment of the constant control system for use in a tandem cold rolling mill having a plurality of stands. Between the (i)th stand and the (i-i-l )th stand in such a tandem mill, there is conducted an operation to obtain an aimed value.
  • (1) denotes the (i)th stand rolling machine, (2) the (i+l )th stand rolling machine, (3) and (4) the electric motors for each stand for screw down purposes, (5) and (6) the electric motors for driving purposes for each stand, (7) the thickness detector, (8) a width detector, (9) a tension meter, (10) and (11) the multiplying calculators, and (12) a tension control circuit.
  • the thickness and the width of the strip being rolled are detected by the thickness detector (7) and the width detector (8) and placed in the multiplier (10).
  • the values of thickness signal and the width signal are multiplied and the output signal represents the cross sectional area of the strip.
  • the value of the cross sectional area signal from the multiplier (10) is multiplied by the tensile stress obtained by preliminary manual calculation, and the output signal of multiplifer (11) is the total tension required to get the desired value of tensile stress in the strip.
  • the value of the tension signal detected by the tension meter (9) is compared with the value of the output signal delivered from the multiplier (11) which is the aimed value of the tension and the difference therebetween is fed into the constant control circuit (12) as a deviation.
  • a conventional type tension control method or a limited tension control method maybe used for the constant control circuit (12) of this invention. That is, when the tension becomes more than the aimed or desired value, the screw downofthe succeeding stand ((i-l-l )th stand in this instance) is screwed down, or the roll speed of the preceding stand ((i)th stand in this instance.) is incremented. If the tension becomes smaller than the aimed or desired value, then the screw down of the succeeding stand is screwed up, or the roll speed of the preceding stand is decremented.
  • FIG. 2 shows an improvement over the embodiment of FIG. 1 in some parts thereof.
  • the embodiment shown in FIG. 2 is the embodiment shown in FIG. 1 to which has been added delay circuits (l3) and (14).
  • the thickness detector (7), the width detector (8) and the tension meter (9) should be at the same location because of the particular nature of this control.
  • the delay circuits (13) and (14) are inserted into the signal lines of the thickness signal and the width signal so as to delay the thickness signal for the period of time that it takes for the strip to run from the point where the thickness detector (7) is to the point where the tension meter (9) is, and also to delay the width signal for the period of time it takes for the strip to run from the width detector (8) to the tension detector (9).
  • the delay circuit will be required in order to vary the delay time proportionate to the rolling speed.
  • Such delay circuit to be used in this invention may be those previously developed in the art.
  • the identical reference numerals in FIG. 2 denote the corresponding parts in FIG. I.
  • FIG. 3 a third embodiment of the present invention is shown in which the thickness signal is obtained from the position of the screw down and the rolling load by applying the formula (2) without using the thickness detector for measuring the thickness.
  • the deviation fed into the tension control circuit (12) in the above going was the difference between the aimed value and the actual value of the total tension.
  • the deviation of the tensile stress is fed into the tension control circuit.
  • the signal representing the cross sectional area which is the output of the multiplier and the output signal from the tension meter (9) are fed into the divider to obtain the tensile stress: i.e., the total tension is divided by the cross sectional area.
  • This tensile stress thus obtained is compared with the aimed tensile stress and the difference therebetween is fed into the tension controller 12.
  • said detecting step includes measuring the size of the strip downstream of the change in width thereof, calculating the cross-section of the strip as a function of said measured size, and wherein said generating step includes multiplying the calculated cross-section by the desired tensile stress to obtain the total desired tension, measuring total tension in the strip downstream of the change in width thereof, comparing the said desired total tension with measured total tension and generating control signals as a function of said comparison, said control signals being used in controlling the rolling operation to maintain said tensile stress constant.
  • said detecting step includes measuring the cross-sectional area of the strip downstream of the change in width thereof
  • said generating step includes measuring total tension in the strip downstream of the change in width thereof, dividing measured total tension by measured cross-sectional area to obtain tensile stress, comparing the measured tensile stress with desired tensile stress and generating control signals as a function of said comparison, said control signals being used in controlling the rolling operation to maintain said tensile stress constant.
  • said detecting step includes measuring the thickness of the strip downstream of the change in width thereof during rolling and generating a signal corresponding to the measured thickness; measuring the changed width of the strip during rolling and generating a signal corresponding to said width; multiplying the thickness signal and the width signal to generate a signal corresponding to the cross-sectional area of the strip; and wherein said generating step includes multiplying the measured cross-sectional area signal by a predetermined signal representing desired tensile stress in the strip to obtain a signal corresponding to desired total tension in the strip; measuring the total tension in the strip downstream of the change in width thereof during rolling and generating a signal corresponding to the measured total tension; and comparing the measured total tension signal with the total desired tension signal derived from the predetermined desired tensile stress to generate a deviation signal; said deviation signal being used in controlling the rolling operation to maintain said tensile stress constant and at a predetermined value.
  • said detecting step includes measuring at least the width of the strip downstream of the change in width thereof during rolling; determining the cross-sectional area of the strip from the measured width and generating a signal corresponding to the cross-sectional area; and wherein said generating step includes generating a total desired tension signal from the cross-sectional area signal.
  • the method according to claim 5 further comprising measuring the thickness of said strip downstream of the change in width thereof during rolling and using the measured thickness to determine cross-sectional area of the strip.
  • said thickness is measured by generating a signal corresponding to the screw down position of a set of rolls; generating a signal corresponding to the rolling load of the same set of rolls; and summing said rolling load and screw down position signals to and from a signal representing a predetermined desired tensile stress in the strip; and comparing the total desired tension signal with another signal representing measured total tension in the strip downstream of the change in width thereof to generate a deviation signal; said deviation signal being used in controlling the rolling operation to maintain said tensile stress constant at a predetermined value.
  • said detecting step includes measuring the thickness of said strip downstream of the change in width thereof and generating a signal corresponding to the measured thickness, and wherein said step of generating a crosssectional area signal comprises multiplying the measured thickness signal with the measured width signal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US00176766A 1970-08-26 1971-08-20 Control method of tension in rolling mills (1) Expired - Lifetime US3760621A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45074281A JPS4938977B1 (fr) 1970-08-26 1970-08-26

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US3760621A true US3760621A (en) 1973-09-25

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US00176766A Expired - Lifetime US3760621A (en) 1970-08-26 1971-08-20 Control method of tension in rolling mills (1)

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US (1) US3760621A (fr)
JP (1) JPS4938977B1 (fr)
DE (1) DE2142859C3 (fr)
FR (1) FR2104876B1 (fr)
GB (1) GB1326157A (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852983A (en) * 1973-04-25 1974-12-10 Westinghouse Electric Corp Work strip gauge change during rolling in a tandem rolling mill
DE2800197A1 (de) * 1977-01-07 1978-07-13 Hitachi Ltd Verfahren und anordnung zur regelung der walzgut-laengsspannung zwischen den walzgeruesten einer tandemwalzstrasse
EP0075961A2 (fr) * 1981-09-30 1983-04-06 Mitsubishi Denki Kabushiki Kaisha Dispositif de commande pour un laminoir continu
US4558577A (en) * 1983-01-19 1985-12-17 Ukrainsky Nauchnoissledovatelsky Institut Metallov Roll-forming machine for making articles having cross-sectional configurations varying lengthwise
AU674566B2 (en) * 1993-02-11 1997-01-02 Trico Products Corporation Manufacture of metallic strip
US5875672A (en) * 1993-02-11 1999-03-02 Fourie; Eugene Method and apparatus for manufacturing metallic support beams for windscreen wiper blade assemblies
CN109731921A (zh) * 2019-03-01 2019-05-10 北京金自天正智能控制股份有限公司 一种精轧机架间张力的计算方法
CN114761149A (zh) * 2019-11-25 2022-07-15 N·乌姆拉夫 轧制线

Families Citing this family (4)

* 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
DE3419261C3 (de) * 1984-05-23 1994-12-15 Achenbach Buschhuetten Gmbh Walzenkühl- und/oder Schmiervorrichtung für Kaltbandwalzwerke, insbesondere Feinbandwalzwerke
DE3525457C3 (de) * 1985-07-17 1999-06-10 Mannesmann Ag Walzwerk zur Herstellung warmgewalzter Stahlbänder
FR2628347B1 (fr) * 1988-03-09 1990-12-21 Clecim Sa Procede et installation perfectionnes pour le laminage continu d'une bande metallique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3186201A (en) * 1961-06-21 1965-06-01 Steelworks Automation Ltd Production of metal strip
US3281917A (en) * 1964-01-08 1966-11-01 United States Steel Corp Method and apparatus for coldrolling strip continuously
US3603124A (en) * 1968-05-09 1971-09-07 Nippon Kokan Kk Computer control system for rolling metal strips using feed-forward and prediction
US3618348A (en) * 1968-05-21 1971-11-09 Nippon Kokan Kk Method of controlling rolling of metal strips

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3186201A (en) * 1961-06-21 1965-06-01 Steelworks Automation Ltd Production of metal strip
US3281917A (en) * 1964-01-08 1966-11-01 United States Steel Corp Method and apparatus for coldrolling strip continuously
US3603124A (en) * 1968-05-09 1971-09-07 Nippon Kokan Kk Computer control system for rolling metal strips using feed-forward and prediction
US3618348A (en) * 1968-05-21 1971-11-09 Nippon Kokan Kk Method of controlling rolling of metal strips

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3852983A (en) * 1973-04-25 1974-12-10 Westinghouse Electric Corp Work strip gauge change during rolling in a tandem rolling mill
DE2800197A1 (de) * 1977-01-07 1978-07-13 Hitachi Ltd Verfahren und anordnung zur regelung der walzgut-laengsspannung zwischen den walzgeruesten einer tandemwalzstrasse
EP0075961A2 (fr) * 1981-09-30 1983-04-06 Mitsubishi Denki Kabushiki Kaisha Dispositif de commande pour un laminoir continu
EP0075961A3 (en) * 1981-09-30 1984-03-21 Mitsubishi Denki Kabushiki Kaisha Control device for a continuous rolling machine
US4520642A (en) * 1981-09-30 1985-06-04 Mitsubishi Denki Kabushiki Kaisha Control device for continuous rolling machine
US4558577A (en) * 1983-01-19 1985-12-17 Ukrainsky Nauchnoissledovatelsky Institut Metallov Roll-forming machine for making articles having cross-sectional configurations varying lengthwise
AU674566B2 (en) * 1993-02-11 1997-01-02 Trico Products Corporation Manufacture of metallic strip
US5875672A (en) * 1993-02-11 1999-03-02 Fourie; Eugene Method and apparatus for manufacturing metallic support beams for windscreen wiper blade assemblies
CN109731921A (zh) * 2019-03-01 2019-05-10 北京金自天正智能控制股份有限公司 一种精轧机架间张力的计算方法
CN109731921B (zh) * 2019-03-01 2020-05-19 北京金自天正智能控制股份有限公司 一种精轧机架间张力的计算方法
CN114761149A (zh) * 2019-11-25 2022-07-15 N·乌姆拉夫 轧制线
US20220402007A1 (en) * 2019-11-25 2022-12-22 Norbert Umlauf Roll line
US11883867B2 (en) * 2019-11-25 2024-01-30 Norbert Umlauf Roll line
CN114761149B (zh) * 2019-11-25 2024-03-15 N·乌姆拉夫 轧制线

Also Published As

Publication number Publication date
DE2142859C3 (de) 1980-06-19
GB1326157A (en) 1973-08-08
DE2142859A1 (de) 1972-03-02
JPS4938977B1 (fr) 1974-10-22
DE2142859B2 (de) 1979-10-11
FR2104876B1 (fr) 1974-03-29
FR2104876A1 (fr) 1972-04-21

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