US3913363A - Method and apparatus for shape control of metal products in continuous rolling mill - Google Patents

Method and apparatus for shape control of metal products in continuous rolling mill Download PDF

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Publication number
US3913363A
US3913363A US341579A US34157973A US3913363A US 3913363 A US3913363 A US 3913363A US 341579 A US341579 A US 341579A US 34157973 A US34157973 A US 34157973A US 3913363 A US3913363 A US 3913363A
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United States
Prior art keywords
mill
counter
size change
signals
mill stands
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US341579A
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English (en)
Inventor
Seiji Fujii
Masamoto Kamata
Masayuki Ishida
Hiroshi Kuwamoto
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JFE Engineering Corp
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Nippon Kokan Ltd
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Publication date
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Publication of USB341579I5 publication Critical patent/USB341579I5/en
Application granted granted Critical
Publication of US3913363A publication Critical patent/US3913363A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
    • B21B37/38—Control of flatness or profile during rolling of strip, sheets or plates using roll bending
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B21B2261/05—Different constant thicknesses in one rolled product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
    • B21B39/08—Braking or tensioning arrangements

Definitions

  • ABSTRACT In a method of continuously rolling a metal strip by a tandem mill including a plurality of mill stands, when the strip size is to be varied, pass signals are generated when a given size change point of the strip passes successively through respective mill stands. A computer generates control signals in response to the pass signals and each control signal varies the degree of bending' of each roll when the size change point reaches a mill stand.
  • This invention relates to an apparatus and method for rolling a metal strip and more particularly to an apparatus and method for shape control while continuously rolling a metal strip by means of tandem mills wherein when the strip size is to be varied by changing a pass schedule, an adequate degree of roll bending is automatically established at the point of varying the strip size.
  • step rolling operation is performed on a continuous strip
  • the operator has been required to adjust various settings necessary for size change while the rolling mill is stopped or its speed is reduced to an extremely low speed.
  • a method of rolling a metal strip by means of a tandem mill including a plurality of mill stands comprising the steps of successively generating pass signals when a given size change point of the strip successively passes through said mill stands, generating control signals in response to said pass signals and varying the degree of roll bending of respective mill stands in response to said control signals when said size change points pass through respective mill stands.
  • a control system for a tandem mill including a plurality of mill stands through which a metal strip is passed, the control system comprising a detector provided on the inlet side of the first mill stand for detecting a size change point on the strip, a plurality of pulse generators operated by respective mill stands, a counter responsive to the pulses for generating pass signals, a computer responsive to the pass signals for generating control signals for respective mill stands, and a plurality of roll bending devices provided for respective mill stands, the roll bending devices respectively responding to respective control signals for varying the degree of roll bending when the size change point passes through respective mill stands.
  • the roll peripheral speed, roll gap and crown of respective mill stands are automatically adjusted when the size change point passes through respective mill stands, thus enabling the gauge of the rolled strips to be varied without stopping the mill, thus producing well shaped rolled strips of uniform thickness not only in the longitudinal direction but also in the transverse direction.
  • FIGURE is a diagram showing tandem mill stands and an electrical control system for carrying out the method of this invention.
  • FIG. 1 shows an electric control system applied to a tandem mill including five mill stands No. 1 through No. 5 arranged to roll a metal strip. Respective mill stands are equipped with roll bending devices 2 through 6 of known construction which may be operated by pressurized oil. Before entering the mill stands, the metal strip passes through a bridle roll 7. Pulse generators 9, 10, 11 and 12 are connected to respective mill stands to be operated in accordance with the rotation of their rolls. Output pulses of the pulse generators are applied to a counter 14 through a compensating circuit 13. An initial value sig nal is applied to counter 14 through input terminals 15.
  • a plurality of pass signal generators 17 through 21 are connected to the output of the counter 14 and the outputs of the pass signal generators are applied to a computer 22, the output thereof being applied to roll bending devices 2 through 6.
  • a size changing point detector 23 is provided at a distance I, from the first mill stand between bridle roll 7 and the first mill stand. (I is the distance between adjacent mill stands.)
  • P P P P and P represent roll bender pressures of respective mill stands before size change and P P P P and P the roll bender pressures after size change. Values of P through P are calculated by a computer or by utilizing an appropriate table and are stored in the computer 22.
  • the control system starts its operation when the size changing points a passes by the detector 23.
  • the distance 1, between the detector 23 and the No. 1 mill stand is set in counter 14 through input terminal 15.
  • Bridle roll 7 is used to operate a pulse generator 8 and the output of the pulse generator 8 is applied through compensating circuit 13 to counter 14 for subtraction counting.
  • the circuit is designed such that the count of counter 14 is reduced to zero when size changing point a passes through No. 1 mill stand at which time pass signal generator 17 generates a pass signal which causes computer 22 to generate a stored signal.
  • This signal is applied to roll bending device 2 of the No. 1 mill stand to vary its roll bender pressure from P to P At the same time, the distance 1 between mill stands No. 1 and No.
  • the purpose of the compensating circuit 13 is to vary the relationship between the number of pulses and distances l and l in accordance with variations in the diameters of the bridle roll and the mill rolls and to compensate for the effect of the forward slip rate during rolling operation.
  • Respective roll bender pressures after the size change can also be provided by immediately feeding back the rolling condition to the computer 22 to cause it to provide control signals for respective roll bending devices.
  • the invention provides a method and apparatus for controlling the degree of roll bending of a tandem mill including a plurality of mill stands wherein pass signals are successively generated by the passage of a size change point of a metal strip through respective mill stands, control signals are generated in response to the pass signals and the degree of roll bending of respective,
  • mill stands are varied from those of before size change to those of after size change in response to respective control signals.
  • a method of rolling a metal strip by means of a tandem mill including a plurality of spaced apart mill stands comprising:
  • a control system for a tandem mill including a plurality of spaced apart mill stands through which a metal strip is passed, each mill stand including a respective roll bending device, said control system comprising:
  • a detector provided on the inlet side of the first mill stand for detecting a size change point on said strip
  • a counter responsive to the pulses generated by said respective pulse generators for generating pass signals respectively corresponding to the passing of said size change point through each mill stand, said pass signals being generated responsive to said counter counting to a predetermined count
  • each roll bending device includes means responsive to one of said control signals for varying the oil pressure appliedto said roll bending device.
  • control system which further comprises a bridle roll provided before said detector, an additional pulse generator driven by said bridle roll and means for applying the output of said additional pulse generator to said counter, said counter being responsive to said additional pulse generator for generating a first pass signal corresponding to the passing of said size change point through the first mill stand.
  • control system comprising a compensating circuit connected between said counter and said pulse generators associated with respective mill stands and said bridle roll.
  • control system further comprising means for setting the distance between said detector and the first mill stand and the distances between adjacent mill stands in said counter.
  • step of successively generating pass signals comprises generating a plurality of pulse signals at each of said mill stands, and counting the pulses respectively generated at each of said mill stands, said pass signals being generated at predetermined counts during said counting operation.
  • step of counting includes setting said counter to a predetermined count corresponding to each of the distance between adjacent mill stands.
  • a bridle roll is provided before a detector which detects said size change point, and comprising generating a pass signal coresponding to the passing of said size change point through the first mill stand.
  • the method according to claim 13 comprising generating an additional plurality of pulses responsive to the operation of said bridle roll, counting said additional pulses and generating a first pass signal responsive to a predetermined count of said additional pulses and corresponding to the passing of said size change point through the first mill stand.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
US341579A 1972-03-28 1973-03-15 Method and apparatus for shape control of metal products in continuous rolling mill Expired - Lifetime US3913363A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47030962A JPS5035900B2 (en)) 1972-03-28 1972-03-28

Publications (2)

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USB341579I5 USB341579I5 (en)) 1975-01-28
US3913363A true US3913363A (en) 1975-10-21

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US341579A Expired - Lifetime US3913363A (en) 1972-03-28 1973-03-15 Method and apparatus for shape control of metal products in continuous rolling mill

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US (1) US3913363A (en))
JP (1) JPS5035900B2 (en))
DE (1) DE2314701B2 (en))
FR (1) FR2178126B1 (en))
GB (1) GB1378845A (en))
IT (1) IT981996B (en))

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4485497A (en) * 1979-12-27 1984-12-04 Mitsubishi Denki Kabushiki Kaisha Apparatus for controlling re-distribution of load on continuous rolling mill
RU2125495C1 (ru) * 1993-03-29 1999-01-27 СМС Шлеманн-Зимаг АГ Способ прокатки металлических полос и устройство для его осуществления
US6336350B1 (en) * 1999-08-06 2002-01-08 Muhr Und Bender Kg Method for the flexible rolling of a metallic strip
US6336349B1 (en) 1999-08-06 2002-01-08 Muhr Und Bender Kg Method for the flexible rolling of a metallic strip

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960010237B1 (ko) * 1992-08-07 1996-07-26 가와사끼 세이데쓰 가부시끼가이샤 엔드리스 열간압연방법
DE19939166B4 (de) * 1999-08-20 2005-07-07 Muhr Und Bender Kg Verfahren zum flexiblen Walzen eines Metallbandes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714805A (en) * 1971-11-11 1973-02-06 Wean United Inc Control system and method for concurrent automatic gage and crown control of a rolling mill
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750437A (en) * 1970-03-07 1973-08-07 Nippon Kk Method and apparatus for controlling continuous tandem rolling mills
US3727441A (en) * 1970-03-16 1973-04-17 Hitachi Ltd Thickness control apparatus for rolling mill
US3714805A (en) * 1971-11-11 1973-02-06 Wean United Inc Control system and method for concurrent automatic gage and crown control of a rolling mill

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4485497A (en) * 1979-12-27 1984-12-04 Mitsubishi Denki Kabushiki Kaisha Apparatus for controlling re-distribution of load on continuous rolling mill
RU2125495C1 (ru) * 1993-03-29 1999-01-27 СМС Шлеманн-Зимаг АГ Способ прокатки металлических полос и устройство для его осуществления
US6336350B1 (en) * 1999-08-06 2002-01-08 Muhr Und Bender Kg Method for the flexible rolling of a metallic strip
US6336349B1 (en) 1999-08-06 2002-01-08 Muhr Und Bender Kg Method for the flexible rolling of a metallic strip

Also Published As

Publication number Publication date
IT981996B (it) 1974-10-10
USB341579I5 (en)) 1975-01-28
FR2178126A1 (en)) 1973-11-09
DE2314701B2 (de) 1977-10-20
GB1378845A (en) 1974-12-27
DE2314701A1 (de) 1973-10-11
JPS5035900B2 (en)) 1975-11-19
FR2178126B1 (en)) 1976-04-09
JPS4911755A (en)) 1974-02-01

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