US3599459A - Shape of sheet material - Google Patents

Shape of sheet material Download PDF

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Publication number
US3599459A
US3599459A US808962A US3599459DA US3599459A US 3599459 A US3599459 A US 3599459A US 808962 A US808962 A US 808962A US 3599459D A US3599459D A US 3599459DA US 3599459 A US3599459 A US 3599459A
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United States
Prior art keywords
strip material
rolling mill
curves
rolling
control means
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Expired - Lifetime
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US808962A
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English (en)
Inventor
Kenneth A Yeomans
Bruno Sabatini
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British Iron and Steel Research Association BISRA
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British Iron and Steel Research Association BISRA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips

Definitions

  • the relevant transverse strip profile at all stages other than the initial entry is determined by the, profile of the gap between the work rolls during the rolling process.
  • the loaded roll gap automatically adjusted be of the correct geometrical form.
  • the actual roll gap profile depends upon such factors as the camber ground on the rolls, the roll wear, the roll deflection under the forces acting on them and the strains produced by the thermal gradients. Only by maintaining the resultant effect of all these factors within close limits may material of good shape be rolled.
  • a method of rolling strip material including the steps of anticipating or detecting during rolling the anticipated or actual errors respectively in the profile of the roll gap, expressing the symmetrical component of the profile errors as a combination of a plurality of curvatures of different geometric form, deriving the coefficients of said curves to provide error signals, and translating said error signals into control signals whereby to adjust by a plurality of different control means the deflection of the rolls so as to correct for the anticipated or measured errors in the profile of the roll gap and hence of the strip being rolled.
  • apparatus for rolling strip material comprising means for anticipating or detecting during rolling the errors in the profile of the roll gap; computer means programmed to express the symmetrical component of the profile errors as a combination of a plurality of curvatures ofdifferent geometric form, to derive the coefficients of said curves to provide error signals, and to translate saiderror signals into control signals; and a plurality of differentcontrol means operable in dependence of said control signals to adjust the deflection of the rolls so as to correct for the anticipated or measured errors in the profile of the roll gap and hence ofthe strip to be rolled.
  • L, P, Q, S, etc. are constants characterizing a particular error-distribution
  • X is the lateral distance from the strip midwidth point
  • E is the error in profile at point x.
  • K K etc. are constants which are characteristic of the rolling conditions and which can be determined either experimentally or theoretically; and AT; is a small change in input rolling tension, AT, is a small change in output rolling tension, As is a small change in screwdown position, and AI is a small change in rolling bending force etc.
  • FIG. 1 shows diagrammatically a strip shape sensing arrangement of apparatus according to the invention
  • FIG. 2 shows diagrammatically a roll gap or strip, profile defined by two component curves
  • FIG. 3 shows diagrammatically an alternative strip shape sensing arrangement
  • FIG. 4 is a graph of relationship between coefficients and two control means
  • FIG. 5 shows diagrammatically apparatus according to the invention.
  • the symmetrical component of the profile errors is expressed by computer 8 as a combination of two curvatures of different geometric form (x and x), and the computer derives the coefficients P, Q of these curves to provide from stored information such as that indicated in FIG. 4, error signals which are employed as control signals for two or more different control means which correct the measured profile errors by corresponding adjustments to the deflection of the rolls.
  • the two coefiicients of roll gap profile error can in general only be corrected by a minimum of two different control means of the rolling mill. These control means must be such that they independently produce changes in the form of the roll gap profile that are not affine. Referring to FIG. 5, two such control means are provided by a control 12 for adjusting the total tension on the strip as it leaves or enters the mill and a control 14 for controlling hydraulic jacks 16 between the chocks of the work roll and back up roll to vary the forces on the work roll.
  • the mill also includes a control 18 for adjusting differentially the screwdown devices 20 of the roll to correct asymmetrical shape errors.
  • the device 6 In the case of anticipating errors in the profile of the roll gap during rolling, the device 6 would assume a position (shown dotted in FIG. on the input side of the rolls, and would be used in conjunction with a device (not shown) for detecting the thickness profile of the ingoing strip; in addition various relevant variables such as roll camber rolling load, roll support forces and the mechanical constants of the mill stand or stand would be monitored and "fed to the computer 8.
  • the translation of the measurements of the error in shape of the strip into signals to command variations in the tension (i.e., rolling load) and the jack force can be achieved by using techniques that are well known and which may demand only a relatively simple digital or analogue computing apparatus.
  • the adjustments to the rolling load or jack force may have an effect on the gauge of the material that is being rolled, the effect depending on the position and method of measurements, and for this reason automatic gauge control adjustments by, for example, changes in the settings of the mill screwdown will usually be made simultaneously with adjustments tocorrect the shape.
  • a method of rolling strip material in a rolling mill including detecting during rolling differences in fractional reduction at locations spaced transversely of strip material leaving the gap between work rolls of the mill; deriving from the detected differences in fractional reduction an expression representative of the error in the profile of the gap between the work rolls as a combination of a plurality of curves of different geometric form defined by functions of transverse distance of said locations from the centerline of the strip, and deriving coefficients of said curves to provide control signals; and adjusting in response to said control signals a plurality of different rolling mill control means to correct for error in the profile of the gap between the work rolls.
  • the plurality of different rolling mill control means includes at least tension control means for adjusting the total tension of the strip material passing into or leaving the work rolls; and hydraulic jack control means for adjusting hydraulic jacks for varying the bending forces on the work rolls.
  • a rolling mill for rolling strip material including sensor means for detecting during rolling differences in fractional reduction at locations spaced transversely of strip material leaving the gap between work rolls of the mill; computer means for (a) deriving from the detected differences in fractional reduction an expression representative of the error in the profile of the gap between the work rolls in the form of a combination of a plurality of curves of different geometric form defined by functions of the transverse distance of said locations from the centerline of the strip and (b) deriving coefficients of said curves to provide control signals; and a plurality of different rolling mill control means adjustable in response to the control signals so as to correct for error in the profile of the gap between the work rolls.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
US808962A 1968-03-25 1969-03-20 Shape of sheet material Expired - Lifetime US3599459A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1432568 1968-03-25

Publications (1)

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US3599459A true US3599459A (en) 1971-08-17

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US808962A Expired - Lifetime US3599459A (en) 1968-03-25 1969-03-20 Shape of sheet material

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US (1) US3599459A (enrdf_load_html_response)
DE (1) DE1914820A1 (enrdf_load_html_response)
FR (1) FR2004691A1 (enrdf_load_html_response)
GB (1) GB1231008A (enrdf_load_html_response)
SE (1) SE358315B (enrdf_load_html_response)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731508A (en) * 1969-09-03 1973-05-08 British Iron Steel Research Rolling of strip or plate material
US3875776A (en) * 1972-12-11 1975-04-08 Hitachi Ltd Method of and apparatus for controlling a rolling mill
US3934438A (en) * 1973-05-09 1976-01-27 Nippon Kokan Kabushiki Kaisha Method of long-edge shape control for tandem rolling mill
US4152912A (en) * 1978-02-24 1979-05-08 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Metal rolling process and mill
DE2911621A1 (de) * 1978-03-31 1979-10-04 Loewy Robertson Eng Co Ltd Verfahren zum betreiben eines walzwerks zur erzeugung von metallbaendern
US4711109A (en) * 1983-03-14 1987-12-08 Sms Schloemann-Siemag, A.G. Controlling thickness and planarity of hot rolled strips
CN104785545A (zh) * 2015-04-20 2015-07-22 中冶南方工程技术有限公司 一种接触式板形辊测量信号综合处理方法和装置
CN113198853A (zh) * 2021-04-14 2021-08-03 首钢集团有限公司 一种检测带钢板廓缺陷的方法及装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5467550A (en) * 1977-11-09 1979-05-31 Mitsubishi Electric Corp Shape control of rolled material
HUT34788A (en) * 1983-05-04 1985-04-28 Borsodi Vegyi Komb Light-structure building unit system connectable by quick-joint fitting and complying with the increased thermal requirements
JPS60206511A (ja) * 1984-03-29 1985-10-18 Sumitomo Metal Ind Ltd 板形状制御方法及びその装置
DE3419261C3 (de) * 1984-05-23 1994-12-15 Achenbach Buschhuetten Gmbh Walzenkühl- und/oder Schmiervorrichtung für Kaltbandwalzwerke, insbesondere Feinbandwalzwerke
CN106643625B (zh) * 2016-11-11 2019-01-29 北京首钢冷轧薄板有限公司 一种板形数据测量系统，数据修正方法及装置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3213655A (en) * 1962-12-03 1965-10-26 Westinghouse Electric Corp Workpiece shape control apparatus
US3315506A (en) * 1964-01-09 1967-04-25 Westinghouse Electric Corp Workpiece tension and shape control method and apparatus
US3334508A (en) * 1964-11-09 1967-08-08 American Metal Climax Inc Method and apparatus for controlling flatness in sheet metal
US3431761A (en) * 1964-03-25 1969-03-11 Industrial Nucleonics Corp Two-dimensional material property control system
US3442104A (en) * 1965-01-30 1969-05-06 Sumito Metal Ind Ltd Controlling method and measuring instrument for the flatness of strips
US3470739A (en) * 1966-09-07 1969-10-07 Yawata Seitetsu Kk Apparatus for measuring the shape of sheet or strip
US3475935A (en) * 1965-10-29 1969-11-04 Hitachi Ltd Control apparatus and system for strip rolling
US3496744A (en) * 1966-02-05 1970-02-24 Sumitomo Light Metal Ind Method and apparatus for controlling the contours of rolling mill rolls to obtain metal sheet or strip of superior flatness
US3499306A (en) * 1965-07-09 1970-03-10 British Aluminium Co Ltd Measurement of the shape and flatness of sheet or strip material

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3213655A (en) * 1962-12-03 1965-10-26 Westinghouse Electric Corp Workpiece shape control apparatus
US3315506A (en) * 1964-01-09 1967-04-25 Westinghouse Electric Corp Workpiece tension and shape control method and apparatus
US3431761A (en) * 1964-03-25 1969-03-11 Industrial Nucleonics Corp Two-dimensional material property control system
US3334508A (en) * 1964-11-09 1967-08-08 American Metal Climax Inc Method and apparatus for controlling flatness in sheet metal
US3442104A (en) * 1965-01-30 1969-05-06 Sumito Metal Ind Ltd Controlling method and measuring instrument for the flatness of strips
US3499306A (en) * 1965-07-09 1970-03-10 British Aluminium Co Ltd Measurement of the shape and flatness of sheet or strip material
US3475935A (en) * 1965-10-29 1969-11-04 Hitachi Ltd Control apparatus and system for strip rolling
US3496744A (en) * 1966-02-05 1970-02-24 Sumitomo Light Metal Ind Method and apparatus for controlling the contours of rolling mill rolls to obtain metal sheet or strip of superior flatness
US3470739A (en) * 1966-09-07 1969-10-07 Yawata Seitetsu Kk Apparatus for measuring the shape of sheet or strip

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731508A (en) * 1969-09-03 1973-05-08 British Iron Steel Research Rolling of strip or plate material
US3875776A (en) * 1972-12-11 1975-04-08 Hitachi Ltd Method of and apparatus for controlling a rolling mill
US3934438A (en) * 1973-05-09 1976-01-27 Nippon Kokan Kabushiki Kaisha Method of long-edge shape control for tandem rolling mill
US4152912A (en) * 1978-02-24 1979-05-08 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Metal rolling process and mill
DE2911621A1 (de) * 1978-03-31 1979-10-04 Loewy Robertson Eng Co Ltd Verfahren zum betreiben eines walzwerks zur erzeugung von metallbaendern
US4711109A (en) * 1983-03-14 1987-12-08 Sms Schloemann-Siemag, A.G. Controlling thickness and planarity of hot rolled strips
CN104785545A (zh) * 2015-04-20 2015-07-22 中冶南方工程技术有限公司 一种接触式板形辊测量信号综合处理方法和装置
CN104785545B (zh) * 2015-04-20 2017-01-11 中冶南方工程技术有限公司 一种接触式板形辊测量信号综合处理方法和装置
CN113198853A (zh) * 2021-04-14 2021-08-03 首钢集团有限公司 一种检测带钢板廓缺陷的方法及装置
CN113198853B (zh) * 2021-04-14 2023-09-15 首钢集团有限公司 一种检测带钢板廓缺陷的方法及装置

Also Published As

Publication number Publication date
GB1231008A (enrdf_load_html_response) 1971-05-05
SE358315B (enrdf_load_html_response) 1973-07-30
DE1914820A1 (de) 1970-01-15
FR2004691A1 (enrdf_load_html_response) 1969-11-28

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