US3841124A - Width controlling apparatus and method for rolled strips - Google Patents

Width controlling apparatus and method for rolled strips Download PDF

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Publication number
US3841124A
US3841124A US00295830A US29583072A US3841124A US 3841124 A US3841124 A US 3841124A US 00295830 A US00295830 A US 00295830A US 29583072 A US29583072 A US 29583072A US 3841124 A US3841124 A US 3841124A
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United States
Prior art keywords
width
rolling mill
tension
strip
tensioning
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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
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US00295830A
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English (en)
Inventor
S Shida
S Tsumura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
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Hitachi Ltd
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Filing date
Publication date
Priority claimed from JP7947071A external-priority patent/JPS5513805B2/ja
Priority claimed from JP46079471A external-priority patent/JPS5024905B2/ja
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
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Publication of US3841124A publication Critical patent/US3841124A/en
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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
    • B21B37/48—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
    • 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
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • 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
    • B21B37/22—Lateral spread control; Width control, e.g. by edge rolling
    • 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
    • B21B37/50—Tension control; Compression control by looper control

Definitions

  • FIG. 1 A first figure.
  • This invention relates to a. width controlling method of the rolled sheet and removing the edge cracks formed in said rolled sheet in the hot-rolling operation and thereby preventing the growth of cracks or severance of the rolled strip, otherwise occurring in a coldrolling step.
  • the present invention contemplates the elimination of such disadvantages as above described, and the purport thereof is to effect the width control of a rolled strip in a hot tandem rolling mill, by controlling the inter-stand tension of the rolling strip.
  • An object of the present invention is to provide novel control means capable of varying the width of a rolled strip.
  • Another object of the invention is to control the width of a rolled strip with easiness by simple means based on a new knowledge.
  • Still another object of the invention is to provide a construction and arrangement, adapted for the control of the width of a rolled strip.
  • Still another object of the invention is to control the Q width of a rolled strip withv accuracy.
  • a further object of the invention is to control the width of a rolled strip predictiveiy.
  • a still further object of the invention is to make it possible to control the width of a rolling strip with. an adequate width changing ratio.
  • An additional object of. the invention is tom e it possible to control the thickness of a rolledstrip, concurrently with-controlling the width thereof.
  • FIGS. l through 4 are diagrams graphically showing the relationship between the inter-stand tension and the width change, of various rolled steel strips respectively;
  • FIGS. 5 and 6 are schematic diagrams for explaining the basic concept of the present invention.
  • FIGS. 7 through 9 are schematic diagrams respectively showing different embodiments of the width control apparatus according to-the invention.
  • FIG. 10 is an illustrative diagram exemplifying a rolling strip width correcting method
  • FIGS. 11 and 12 are schematic diagrams for explainand FIGS. 13 through 16 are schematic diagrams respectively showing different embodiments of the invention.
  • the present inventors through strenuous study and experiment, have found a novel rolling strip width con- I trolling method and apparatus in which control means novel over the conventional concept described above or, more specifically, the inter-stand tension of a rolled strip, is positivelyutilized, and which thereby makes it possible tocontrol the width of the rolled strip.
  • the present inventors have made explicit the relationship between the tension and the width change, of various rolled steel strips,'and found that the width of a rolled strip of each steel material can be easily changed by varying the tension in said rolled strip.
  • the present invention has been originated from such knowledge. Namely, such-knowledge has provided a very important basis for the present'inventors to arrive at the present invention.
  • FIGS. lthrough 4' exemplify the results of the abovementioned experiment conducted by the present inventors.
  • FIG. 1 shows the relationship between the tension and the-width change of arolled strip of low-carbon steel
  • FIG. 2 of high-carbon steel
  • FIG. 3 of l8-chromium stainless steel
  • FIG. 4 of l8- chromium -8-nickel stainless steel.
  • a width change on the order of 0.5 1.5 percent'or in other words, a width change of about 10 mm of a rolled strip having a width, for example, of l m, can be obtained very easily by means of a'relatively small tension to the rolled strip.
  • the desired width control can be sufiiciently achieved by the tension control, at not necessarily all the stands but at only one stand of this type of rolling mill.
  • the interstand tension control is effected at-the forward stand in response to a command-from tension detector means or plate width detector means.
  • the inter-stand tension is controlled by the forming rollwhose rotatingspeed can, be varied'or by a tensioning roll provided additionally.
  • the width control means may be provided in a control system in combination with thickness control means.
  • the curve representing the relationship between the tension and the width is relatively steep as seen in FIGS. 1 through 4, it is preferable to control the width, not by detecting the tension but by detecting the width itself, and thereby controlling the rotational speed of the forming rolls or engaging the tensioning roll with the rolled strip, as described above, to chang the inter-stand tension of said rolled strip.
  • T a(AB/B +b B-H
  • T the rolling strip tension
  • B the rolling strip width H
  • the rolling strip thickness a, b, c constants determined from strip width, strip thickness,'type of steel and temperature
  • the inter-stand tension be controlled by changing the rotational speed ofthe forming rolls or by means of a tensioning roll provided separately, and to provide known looper means between the rearward stands for maintaining the tension substantially constant.
  • FIGS. 5 and 6 are sche matic views of a hot tandem rolling mill having 5 stands (A) to (E).
  • the rolling mill shown in FIG. 5 comprises a tensioning roll 1 provided between the first two stands for contact with a rolled strip 2, loopers 3 of a known type respectively provided between the other adjacent stands for maintaining the strip tension substantially constant, a width detector 4 provided on the exit side of the last stand (E), a coiler 5 and a guide roll 6.
  • atension'gauge 7 is provided in lieu of and in the same position as the tensioning roll 1 in FIG. 5 and the other construction is the same as that of the rolling mill shown in FIG. 5.
  • the inter-stand tension of the rolled strip is controlled by varying the rotational speed of the forming rolls.
  • tensioning roll 1 and the tension gauge 7 are provided only between the first two stands, it should be understood that they may also be provided between the other adjacent stands. It should also be understood that the position of the width detector is not restricted only to the exit side of the last stand.
  • FIG. 7 shows a practical embodiment of the width controlling apparatus of the invention, which is so designed that the actual width of a rolled strip detected by the width detector 4 is. compared with a predetermined desired width in a comparator or calculator 10, and a tension controlling device 11 is actuated by a signal from said comparator or calculator representative of the width deviation, to operate the tensioning roll 1 to control the inter-stand tension of the rolled strip.
  • FIG. 8 shows an embodiment in which not only is the width controlled by means of the interstand tension but also a change of the thickness resulting from the tension change is corrected by speed controlling devices 12A, 12B and depression controlling devices 13A, 13B which are operated in response to the signals from the width detector 4 and the comparator or calculator l0.
  • FIG. 9 shows another embodiment which is of the same construction as that of FIG. 8, except that the tensioning roll 1 in FIG. 8 is replaced by the tension gauge
  • FIGS. 11 and 12 show still other embodiments in which the width detector 4 is provided on the entrance side of the stand (A) of a hot tandem rolling mill having five stands (A) to (E).
  • reference numeral 1 designates a tensioning roll provided between the first two stands for-contact-with a rolled-strip 2; 3 loopers of a known type provided between the other stands for maintaining the strip tension substantially constant; 5 a coiler and 6 a guide roll.
  • the sameparts as those in sition, the other construction being the same as that of FIG. 11.
  • the inter-stand tension of the rolled strip is controlled by varying the rotational speed of the forming rolls.
  • tensioning roll 1 and the tension gauge 7 are provided only between i the first two stands, it should be understood that they may also be provided between the other stands. It should also'be understood that the position of the width detector is not restricted only to the entrance side of the stand A.
  • FIG. 13 shows a practical embodiment of the width controlling apparatus of the invention, which is so designed that the width of the rolled strip detected by the width detector 4 and a deviation of said detected width from the desired width are fed to the calculator 10 together with the width, the thickness, the type of steel and the temperature, or the values of constants a, b and c, mentioned previously and said calculator l0 emits a signal representative of the value of a necessary tension provided in the same position, and further, not only is the width controlled by means of the interstand tension but also a thickness change caused by the tension change is corrected by the speed controlling devices 12A, 12B .and depression controlling devices 13A, 13B which are operated by a signal from the calculator 10. y
  • FIG. 15 shows an embodiment in which an additional width detector 4 is provided in another inter-stand space so as to ensure that the relation between the width deviation and the tension is adequate.
  • FIG. 16 shows by way of example a control system for correcting-the result of width correction in the event when said result of width correction is incorrect, in which the-necessary tensionv is determined from the equation 'givenpreviously, based on the deviation of the width detectedby the width detector 4 from the desired width and the constants-a, b and c as determined from the width, the thickness, the type of steel and the temperature, to control the inter stand tension of a rolled strip and the width of the rolled strip is again detected by. a width detector 4' for comparison with the desired width to correct the constants a, b and c, if necessary.
  • the-necessary tensionv is determined from the equation 'givenpreviously, based on the deviation of the width detectedby the width detector 4 from the desired width and the constants-a, b and c as determined from the width, the thickness, the type of steel and the temperature, to control the inter stand tension of a rolled strip and the width of the rolled strip is again detected by
  • a width controlling apparatus for rolled strips for use in a hot tandem rolling mill, comprising tensioning means for applying tension to a hot rolled strip passing between the rolling mill stands, means for measuring the width of the rolled strip, first means-for generating a signal representative of a predetermined strip width, second means for generating a deviation signal upon comparingva signal from said stripwidth measuring means with the signal from said firstmeans, means for simulating the desired tension to be applied to the rolled strip from various factorsof said rolled strip andmeans being disposed downstream of said tensioning means; means for calculating a desired tension value by utilizing measurements of the strip width as an input,
  • a strip width controlling apparatus for rolled strip in a hot tandem rolling mill comprising: tensioning means for applying tension to a hot rolled strip passing between rolling mill stands of the hot tandem rolling mill; means for measuring the tension, means for measuring the width of the rolled strip;
  • a width controlling apparatus wherein the hot tandem rolling mill includes a pair l.
  • a width controlling apparatus wherein the hot tandem rolling mill has at least three rolling mill stands, and wherein said means for measuring the width of the rolled strip is disposed downstream of the last of said rolling'mill stands, and wherein means are provided between atleast the second and third roll mill stand for maintaining the strip width substantially constant.
  • a width controlling apparatus wherein said means for applying tension includes a tensioning roller disposed between the first and second rolling mill stands.
  • a width controlling apparatus wherein a tension gauge is disposed at least between v the first and second rolling mill stands.
  • a width controlling arrangement according to claim 4, wherein means are provided downstream of a rolling mill stand for compensating for an insufficient strip width correction in said rolling mill stand.
  • a width controlling apparatus wherein at least one tensioning gauge is disposed between at least a pair of adjacent rolling mill stands.
  • a width controlling apparatus according to claim 4, wherein a pair of widthmeasuring means are provided.
  • a width controlling arrangement according to claim 16, wherein at least one of said pair of width measuring means is disposed upstream of a first rolling mill stand.
US00295830A 1971-10-11 1972-10-10 Width controlling apparatus and method for rolled strips Expired - Lifetime US3841124A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP7947071A JPS5513805B2 (de) 1971-10-11 1971-10-11
JP46079471A JPS5024905B2 (de) 1971-10-11 1971-10-11

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3028368A1 (de) * 1979-07-30 1981-02-26 Gen Electric Verfahren zum verbessern der bandebenheit in einer warmbandwalzstrasse
EP0075961A2 (de) * 1981-09-30 1983-04-06 Mitsubishi Denki Kabushiki Kaisha Regeleinrichtung für ein kontinuierliches Walzwerk
US4711109A (en) * 1983-03-14 1987-12-08 Sms Schloemann-Siemag, A.G. Controlling thickness and planarity of hot rolled strips
DE3837032A1 (de) * 1988-10-31 1990-05-03 Hansa Metallwerke Ag Rohrunterbrecher fuer sanitaere anlagen, insbesondere zum einbau in eine sanitaerarmatur
US9764367B2 (en) 2012-10-09 2017-09-19 Primetals Technologies Germany Gmbh Width-altering system for strip-shaped rolling rock
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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4141071A (en) * 1977-03-17 1979-02-20 Bethlehem Steel Corporation Automatic diametric dimension control for mill for rolling round bars
DE3843730C2 (de) * 1988-12-22 1995-06-22 Preussag Stahl Ag Verfahren und Vorrichtung zum Regeln der Bandbreite beim Warmbandwalzen
EP0375094B1 (de) * 1988-12-22 1996-09-18 Preussag Stahl Aktiengesellschaft Verfahren und Vorrichtung zum Warmbandwalzen
DE3843731A1 (de) * 1988-12-22 1990-06-28 Salzgitter Peine Stahlwerke Verfahren und vorrichtung zum warmbandwalzen
DE19851053A1 (de) * 1998-11-05 2000-05-18 Siemens Ag Verfahren und Einrichtung zum Regeln der Breite eines Metallbandes

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2332803A (en) * 1941-12-20 1943-10-26 Carnegie Illinois Steel Corp Method and apparatus for reducing metal bodies
US2345765A (en) * 1942-04-13 1944-04-04 Aluminum Co Of America Tension controlling apparatus
US2949799A (en) * 1956-09-25 1960-08-23 United States Steel Corp Gage-control system for multi-stand strip mill
US3220232A (en) * 1961-07-01 1965-11-30 Bochumer Ver Fur Gusslahfabrik Hot rolling mill controls
US3387472A (en) * 1966-02-04 1968-06-11 Bethlehem Steel Corp Automatic interlock to facilitate automatic control of rolling mill with varying numbers of operational stands
US3507134A (en) * 1968-02-20 1970-04-21 Westinghouse Electric Corp Interstand tension control for tandem cold rolling mills

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2332803A (en) * 1941-12-20 1943-10-26 Carnegie Illinois Steel Corp Method and apparatus for reducing metal bodies
US2345765A (en) * 1942-04-13 1944-04-04 Aluminum Co Of America Tension controlling apparatus
US2949799A (en) * 1956-09-25 1960-08-23 United States Steel Corp Gage-control system for multi-stand strip mill
US3220232A (en) * 1961-07-01 1965-11-30 Bochumer Ver Fur Gusslahfabrik Hot rolling mill controls
US3387472A (en) * 1966-02-04 1968-06-11 Bethlehem Steel Corp Automatic interlock to facilitate automatic control of rolling mill with varying numbers of operational stands
US3507134A (en) * 1968-02-20 1970-04-21 Westinghouse Electric Corp Interstand tension control for tandem cold rolling mills

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3028368A1 (de) * 1979-07-30 1981-02-26 Gen Electric Verfahren zum verbessern der bandebenheit in einer warmbandwalzstrasse
EP0075961A2 (de) * 1981-09-30 1983-04-06 Mitsubishi Denki Kabushiki Kaisha Regeleinrichtung für ein kontinuierliches Walzwerk
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
US4711109A (en) * 1983-03-14 1987-12-08 Sms Schloemann-Siemag, A.G. Controlling thickness and planarity of hot rolled strips
DE3837032A1 (de) * 1988-10-31 1990-05-03 Hansa Metallwerke Ag Rohrunterbrecher fuer sanitaere anlagen, insbesondere zum einbau in eine sanitaerarmatur
US9764367B2 (en) 2012-10-09 2017-09-19 Primetals Technologies Germany Gmbh Width-altering system for strip-shaped rolling rock
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

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