EP1097008B1 - Verfahren und vorrichtung zur reglung der abmessungen eines walzgutendes in einem walzwerk - Google Patents

Verfahren und vorrichtung zur reglung der abmessungen eines walzgutendes in einem walzwerk Download PDF

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Publication number
EP1097008B1
EP1097008B1 EP99933449A EP99933449A EP1097008B1 EP 1097008 B1 EP1097008 B1 EP 1097008B1 EP 99933449 A EP99933449 A EP 99933449A EP 99933449 A EP99933449 A EP 99933449A EP 1097008 B1 EP1097008 B1 EP 1097008B1
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EP
European Patent Office
Prior art keywords
stand
tail
rolls
rolled material
mill
Prior art date
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
EP99933449A
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English (en)
French (fr)
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EP1097008A1 (de
Inventor
Mats Olsson
Dag Sollander
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ABB AB
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ABB AB
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Filing date
Publication date
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Application granted granted Critical
Publication of EP1097008B1 publication Critical patent/EP1097008B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B21B37/72—Rear end control; Front end control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
    • 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
    • B21B2261/08—Diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/04—Front or inlet tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/06—Interstand tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/02—Tension
    • B21B2265/08—Back or outlet tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/12—End of product
    • B21B2273/16—Tail or rear end

Definitions

  • the present invention is related to method for controlling the dimensions of an elongated material rolled in a rolling mill comprising at least three mill stands arranged after each other, wherein a first stand is arranged upstream of a second stand, which is arranged upstream of a third stand, each of said stands comprising two spaced rolls, said elongated material being fed between the rolls of each stand by rotating the rolls, wherein an interstand tension is controlled between at least two of said stands.
  • the invention is a control method for continuous and semi-continuous rolling mills for the production of profiles other than sheet or strip, that is, for hot rolling rod or bar profile of various types. More particularly the invention relates to dimensional control over the tail portion of the rolled material.
  • the present invention is further related to a device for controlling the dimensions of an elongated material rolled in a rolling mill.
  • an alternating series of rolls are typically arranged in a train of mill stands grouped in rolling pairs.
  • a rolling mill is usually arranged in three sections, with a roughing, intermediate and finishing section.
  • Each pair of mill stands in a section usually consists of a first mill stand with rolls set, for example for horizontal rolling thus changing the vertical dimension, and the rolls of a second stand arranged perpendicular to the first stand, vertical in this example.
  • the vertical dimension is reduced in the first stand and the horizontal dimension reduced in the second stand.
  • the rolls of each mill stand have a groove shaped in a specific profile.
  • the depth of the groove and the gap between the rolls determines the resultant height of the rolled material.
  • the width dimension As the rolled material is deformed in the height dimension it also spreads out in a direction perpendicular to the height, the width dimension.
  • the material spreads out in width, preferably to a specified degree. If the material spreads out beyond the contours of the groove, it is called overfill, and if it spreads less than groove contour it is called underfill.
  • the term width is used hereafter to describe a diameter dimension of the rolled material that is parallel to the axis of the rolls of a mill stand.
  • the separation of the rolls in each mill stand and the relative speeds in each mill stand necessary to produce the right dimensions on the finished product are specified in a schedule before rolling starts.
  • the dimensions of the rolled material may be changed in two ways, by changing the separation of the rolls, the roll gap, so deforming the rolled material to a greater or lesser extent.
  • the other principal method is by adjusting the tension in the rolled material.
  • a tension in the rolled material between any two stands is described hereafter as an interstand tension.
  • the physical dimensions of the rolled material, in particular the width, may be affected by changing the interstand tension.
  • the interstand tension is changed by adjusting the speed of the rolls of a one mill stand relative to the rolls of a second mill stand.
  • the interstand tension in rolled material moving downstream towards a point of reference is known as back tension.
  • Interstand tension in rolled material moving downstream away from a point of reference is called front tension.
  • Methods are known for manipulating rolled material which use front tension and methods which use back tension. Adjustments to back tension are more commonly used as a control method because it is up to three times more effective in affecting the width dimension of rolled material than front tension. It is known for example from GB 2,009,974 to measure back tension and use that measurement to control roll speeds.
  • the object of the invention is to control the width of the tail of the rolled material.
  • a further object of the invention is to improve control over width of the tail of the rolled material in any section of the rolling mill.
  • the present invention is a method for controlling the width of a tail of the rolled material between any pair of mill stands in any part of a rolling mill. Control is switched to front tension for each successive pair of mill stands as the tail travels through a rolling mill. The present invention extends control over the width of the rolled material to the tail. Adjustments to increase or decrease interstand tension for the purpose of adjusting width of the tail of the rolled material by means of front tension may be made between any pair of mill stands using this method.
  • control method reduces the amount of substandard rolled material in each rolled billet.
  • a further advantage is that it may be applied to any pair of mill stands with the sole exception of the final pair of stands of a finishing section.
  • this control method may be applied in any section of the mill, the roughing section, intermediate section or the finishing section.
  • this method may be easily refitted to existing rolling mills because it requires measurement and control equipment only, and new mill stands with automatic roll gap separation for example are not required.
  • control throughout all sections of the mill means that smaller, fewer corrections required in the finishing section. It also means reduced wear of the rolls and guide rails due to rolled material that is more consistent in its dimensions.
  • width is used hereafter to describe a diameter of a rolled material that is parallel to the axis of the rolls of a mill stand.
  • Figure 1 and 2 illustrates a part of the rolling mill comprising three mill stands 1, 2, 3. Each stand comprises two spaced, parallell rolls 4, 5. An elongated material 6 is fed between the rolls. A tail of the material has the reference numeral 7. The arrow 14 indicates the feeding direction.
  • Figure 3 illustrates a block diagram of a device according to the invention for controlling the dimensions of the elongated material.
  • Means 8, 9, 10 are arranged for controlling the rotational speed of the rolls in each stand. These rotation means 8, 9, 10 are preferably formed by electric motors.
  • a means 11 is arranged for controlling interstand tension between at least two of said stands.
  • a means 12 is arranged for detecting a tail of the rolled material leaving said first stand. Said detection means 12 is connected to said interstand control means 11.
  • Said control means 11 is arranged to, after having received a detection signal from the detection means, switch off a back tension control between the first 1 and the second stand 2 for the period while the tail 7 travels between the first stand and the second stand, and to switch on a front tension control between the second 2 and the third stand 3, arranged downstream of said second stand, for the period while the tail travels between the first stand and the second stand.
  • Means 13 is arranged for measuring the width of the material between said second stand 2 and said third stand 3.
  • the measuring means is connected to said interstand tension control means 11 in order to adjust the interstand tension based on the measured width.
  • the measuring means 13 are arranged for substantially continuously determining the width of the rolled material after one or more mill stands.
  • the means 8, 9, 10 are arranged for independently controlling the speed of the rolls of each mill stand.
  • the means 12 are arranged for detecting tail position in any mill stand.
  • a control method according to the invention is carried out in a rolling mill that is equipped with measuring means for substantially continuously measuring and storing the width after a first mill stand and after a second mill stand of any pair of mill stands.
  • the speed of each mill stand is independently controlled via a cascade system.
  • the mill stand motors are also arranged with means for measuring the motor current in each mill stand, which is used to detect when a tail of rolled material leaves the roll gap of a mill stand. This is possible because motor current changes as the load in the mill stand changes due to the exit of the tail of the rolled material. Also other means are of course applicable for performing said detection, such as optical means and sensors.
  • Measurements of the height and width of the rolled material is preferably carried out using U-gauges manufactured by ABB Industrial Systems AB. Within the scope of the invention it is also possible to use optical equipment such as lasers or cameras to measure the diameters of the rolled material, or a combination of optical methods and mechanical sensors.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)

Claims (7)

  1. Verfahren zur Regelung oder Steuerung der Abmessungen von langgestrecktem Material (6), welches in einem Walzwerk gewalzt wird, welches mindestens drei Walzgerüste (1,2,3) enthält, die hintereinander angeordnet sind, wobei ein erstes Gerüst (1) stromaufwärts (in Walzrichtung vor) einem zweiten Gerüst (2) angeordnet ist, welches stromaufwärts eines dritten Gerüstes (3) angeordnet ist, wobei jedes der genannten Gerüste zwei voneinander beabstandete Walzen (4,5) enthält, und das langgestreckte Material durch die Walzen eines jeden Gerüstes durch Drehung der Walzen befördert wird, wobei die Zwischengerüst-Spannung zwischen mindestens zwei der genannten Gerüste geregelt oder gesteuert wird, dadurch gekennzeichnet, daß festgestellt wird, wann das hintere Ende (7) des Walzmaterials (6) das erste Gerüst verläßt, daß nach der genannten Feststellung eine Hinterspannungsregelung zwischen dem ersten (1) und zweiten Gerüst (2) für die Zeitdauer, während der das hintere Ende (7) zwischen dem ersten Gerüst und dem zweiten Gerüst wandert, abgeschaltet wird und daß eine Frontspannungsregelung zwischen dem zweiten (2) und dem dritten Gerüst (3) eingeschaltet wird für die Zeitdauer, während der das hintere Ende zwischen dem ersten und dem zweiten Gerüst wandert.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Breite des Materials (6) zwischen dem genannten zweiten (2) und dritten Gerüst (3) gemesssen wird und daß die genannte Zwischengerüst-Spannung in Abhängigkeit dieser Messung sowohl während der Hinterspannungsregelung als auch während der Frontspannungsregelung verstellt wird.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß eine gemessene Breitendifferenz des genannten Walzmaterial (6) hinter dem zweiten Gerüst (2), welche Breitendifferenz außerhalb des Toleranzbereiches liegt, zu einer Frontspannungsanpassung der Rotationsgeschwindigkeit der Walzen (4,5) des genannten zweiten Gerüsts relativ zu der Rotationsgeschwindigkeit der Walzen (4,5) des genannten dritten Gerüstes führt, um die gemessenen Breitendifferenz des Walzmaterials, welches das zweite Gerüst verläßt, zu korrigieren, während das hintere Ende (7) zwischen dem ersten (1) und dem zweiten Gerüst (2) wandert.
  4. Verfahren nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, daß Änderungen der Rotationsgeschwindigkeit der Walzen (4,5) des zweiten Gerüsts (2) vorgenommen werden unter Anwendung der Frontspannungsregelung, um eine gemessene Abmessungsabweichung des Walzmaterials (6), während das hintere Ende (7)des Walzmaterial zwischen dem ersten und dem zweiten Gerüst wandert, zu korrigieren.
  5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet,
    daß festgestellt wird, wann das hintere Ende des Walzmaterials (6) den Walzenspalt des zweiten Gerüstes (2) verläßt,
    und daß ein Signal erzeugt wird zur Zurückstellung auf Hinterspannungsregelung zwischen dem ersten Gerüst (1) und dem zweiten Gerüst (2), um für das Kopfende des nächsten Blocks aus Walzmaterial gerüstet zu sein.
  6. Anordnung zur Regelung oder Steuerung der Abmessungen von langgestrecktem Material (6), welches in einem Walzwerk gewalzt wird, welches mindestens drei Walzgerüste (1,2,3) enthält, die hintereinander angeordnet sind, wobei ein erstes Gerüst (1) stromaufwärts (in Walzrichtung vor) einem zweiten Gerüst (2) angeordnet ist, welches stromaufwärts eines dritten Gerüsts (3) angeordnet ist, wobei jedes der genannten Gerüste zwei voneinander beabstandete Walzen (4,5) enthält, wobei die Anordnung Glieder (8,9,10) zur Regelung oder Steuerung der Rotationsgeschwindigkeit der Walzen (4,5) enthält, um das Material zwischen den Walzen eines jeden Gerüstes hindurch zu befördern, sowie ein Glied (11) zur Regelung oder Steuerung der Zwischengerüst-Spannung zwischen mindestens zwei der genannten Gerüste enthält, dadurch gekennzeichnet, daß die Anordnung ein Glied (12) enthält zur Feststellung, wann das hintere Ende 7 des Walzmaterials das erste Gerüst (1) verläßt, daß das genannte Feststellungsglied an das Zwischengerüst-Spannungsregelglied (11) angeschlossen ist und daß das genannte Regelglied (11) so beschaffen ist, daß es, nachdem es das Feststellungssignal von dem Feststellungsglied (12) erhalten hat, die Hinterspannungsregelung zwischen dem ersten (1) und dem zweiten Gerüst (2) abschaltet für die Zeitdauer, während der das hintere Ende (7) zwischen dem ersten Gerüst und dem zweiten Gerüst wandert, und eine Frontspannungsregelung zwischen dem zweiten Gerüst (2) und dem dritten Gerüst (3) für die Zeitdauer einschaltet, während der das hintere Ende zwischen dem ersten Gerüst und dem zweiten Gerüst wandert.
  7. Anordnung nach Anspruch 6, dadurch gekennzeichnet, daß die Anordnung ein Glied (13) zur Messung der Breite des Materials zwischen dem genannten zweiten Gerüst und dem genannten dritten Gerüst enthält, daß das Meßglied an das Zwischengerüst-Spannungsregelglied (11) angeschlossen ist, um die Zwischengerüst-Spannung in Abgängigkeit der gemessenen Breite anzupassen.
EP99933449A 1998-07-10 1999-07-09 Verfahren und vorrichtung zur reglung der abmessungen eines walzgutendes in einem walzwerk Expired - Lifetime EP1097008B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9802493 1998-07-10
SE9802493A SE513923C2 (sv) 1998-07-10 1998-07-10 Förfarande och anordning för styrning av svansdimensionerna i ett valsverk
PCT/SE1999/001248 WO2000002678A1 (en) 1998-07-10 1999-07-09 A method and a device for controlling tail dimensions in a rolling mill

Publications (2)

Publication Number Publication Date
EP1097008A1 EP1097008A1 (de) 2001-05-09
EP1097008B1 true EP1097008B1 (de) 2003-02-26

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EP99933449A Expired - Lifetime EP1097008B1 (de) 1998-07-10 1999-07-09 Verfahren und vorrichtung zur reglung der abmessungen eines walzgutendes in einem walzwerk

Country Status (7)

Country Link
EP (1) EP1097008B1 (de)
JP (1) JP2002520160A (de)
AT (1) ATE233134T1 (de)
AU (1) AU4950299A (de)
DE (1) DE69905578D1 (de)
SE (1) SE513923C2 (de)
WO (1) WO2000002678A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101563174A (zh) * 2006-12-18 2009-10-21 西门子公司 用于带材的轧制方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101435038B1 (ko) 2012-10-29 2014-08-27 현대제철 주식회사 소재 압연장치
CN116493419A (zh) * 2023-06-27 2023-07-28 山西建龙实业有限公司 一种热轧钢筋尾部轧制微张力柔性控制方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU810319A1 (ru) * 1979-04-04 1981-03-07 Колпинское Отделение Всесоюзногонаучно-Исследовательского Ипроектно-Конструкторского Институтаметаллургического Машиностроения Способ регулировани межклетевыхНАТ жЕНий
SU1286310A2 (ru) * 1985-04-08 1987-01-30 Производственное объединение "Уралмаш" Устройство дл регулировани толщины полосы на концах холоднокатаных рулонов
SU1297959A1 (ru) * 1985-11-10 1987-03-23 Государственный Проектный И Проектно-Конструкторский Институт "Электротяжхимпроект" Система автоматического управлени поштучным редуцированием с нат жением на многоклетевом стане с индивидуальным электроприводом
RU1794517C (ru) * 1990-12-25 1993-02-15 Донецкий научно-исследовательский институт черной металлургии Устройство дл регулировани размеров концов гор чекатаной полосы

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101563174A (zh) * 2006-12-18 2009-10-21 西门子公司 用于带材的轧制方法

Also Published As

Publication number Publication date
EP1097008A1 (de) 2001-05-09
ATE233134T1 (de) 2003-03-15
WO2000002678A1 (en) 2000-01-20
SE9802493D0 (sv) 1998-07-10
SE513923C2 (sv) 2000-11-27
AU4950299A (en) 2000-02-01
DE69905578D1 (de) 2003-04-03
SE9802493L (sv) 2000-03-10
JP2002520160A (ja) 2002-07-09

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