EP1192014B1 - Method and device for rolling a foil of varying thicknesses - Google Patents

Method and device for rolling a foil of varying thicknesses Download PDF

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Publication number
EP1192014B1
EP1192014B1 EP00947823A EP00947823A EP1192014B1 EP 1192014 B1 EP1192014 B1 EP 1192014B1 EP 00947823 A EP00947823 A EP 00947823A EP 00947823 A EP00947823 A EP 00947823A EP 1192014 B1 EP1192014 B1 EP 1192014B1
Authority
EP
European Patent Office
Prior art keywords
rolling
wedge
metal strip
shaped
stand
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
EP00947823A
Other languages
German (de)
French (fr)
Other versions
EP1192014A1 (en
Inventor
Ulrich Lettau
Dietrich Wohld
Wilfried Tautz
Siegbert Steidl
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.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1192014A1 publication Critical patent/EP1192014A1/en
Application granted granted Critical
Publication of EP1192014B1 publication Critical patent/EP1192014B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B21B37/16—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/30—Foil or other thin sheet-metal making or treating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/30—Foil or other thin sheet-metal making or treating
    • Y10T29/301—Method
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/30—Foil or other thin sheet-metal making or treating
    • Y10T29/301—Method
    • Y10T29/302—Clad or other composite foil or thin metal making

Definitions

  • the invention relates to a method and a device for rolling a metal strip in a rolling mill, the rolling mill having at least two rolling stands, the metal strip having at least two partial regions of different thickness, which are connected to one another via a wedge-shaped or approximately wedge-shaped transition piece, and wherein Rolling speed of a roll stand during the rolling of the wedge-shaped or approximately wedge-shaped transition piece depending on the advance of the roll stand, in particular according to WO-A-99/24183, is set.
  • the object is achieved according to the invention by a method according to claim 1 or a device for rolling a metal strip in a rolling mill according to claim 2.
  • the metal strip 1 shows a metal strip 1 of variable thickness as a result of a change in the pass schedule during rolling.
  • the metal strip 1 When leaving the last stand of the rolling mill, the metal strip 1 has an area 4 with the greater thickness, which corresponds to the thickness according to the old pass schedule, and an area 3 of reduced thickness, which corresponds to the thickness according to the new pass schedule. Between the two areas 3 and 4, the metal strip 1 has a wedge-shaped intermediate piece 2.
  • the acceptances and outlet thicknesses of all roll stands generally change. Therefore, for example, according to DE-OS 197 49 424, the roll stands are switched from the old to the new pass schedule at the right time.
  • V11 denotes the rolling speed of the first stand
  • v21 the rolling speed of the second stand
  • v31 the rolling speed of the third stand.
  • FIG 3 shows an additional value ⁇ V L of the target rolling speed as a function of time t.
  • the scale of the speed is shown larger compared to FIG. 2 and FIG.
  • the additional value ⁇ V L for the target rolling speed is set such that the temperature of the rolled strip corresponds as precisely as possible to a desired target temperature.
  • the set speeds compared to FIG. 2 are changed by the additional value ⁇ V L.
  • v12 denotes the target rolling speed of the first stand
  • v22 the target rolling speed of the second stand
  • v32 the target rolling speed of the third stand.
  • FIG. 5 shows further possible courses 5, 6, 7, 8 of the additional value ⁇ V L.
  • the choice of a suitable course 4, 5, 6, 7, 8 for the value ⁇ V L depends on how the desired temperature of the metal strip is set in a suitable manner.
  • boundary or ancillary conditions such as load limits of the roller drives, can be taken into account.

Abstract

A method and a device for rolling a metal strip ( 1 ) in a rolling train, the rolling train having at least two rolling stands, the metal strip ( 1 ) having at least two partial areas ( 3, 4 ) of different thicknesses, which are connected to one another via a wedge-shaped or approximately wedge-shaped transition piece ( 2 ), and the rolling velocity of a rolling stand, during the rolling of the wedge-shaped or approximately wedge-shaped transition piece ( 2 ), being set as a function of the forward slip of the rolling stand and of the temperature of the metal strip.

Description

Die Erfindung betrifft ein Verfahren bzw. eine Einrichtung zum Walzen eines Metallbandes in einer Walzstraße, wobei die Walzstraße zumindest zwei Walzgerüste aufweist, wobei das Metallband zumindest zwei Teilbereiche unterschiedlicher Dicke aufweist, die über ein keilförmiges oder näherungsweise keilförmiges Übergangsstück miteinander verbunden sind, und wobei die Walzgeschwindigkeit eines Walzgerüstes beim Walzen des keilförmigen oder näherungsweise keilförmigen Übergangsstückes in Abhängigkeit der Voreilung des Walzgerüstes, insbesondere gemäß der WO-A-99/24183, eingestellt wird.The invention relates to a method and a device for rolling a metal strip in a rolling mill, the rolling mill having at least two rolling stands, the metal strip having at least two partial regions of different thickness, which are connected to one another via a wedge-shaped or approximately wedge-shaped transition piece, and wherein Rolling speed of a roll stand during the rolling of the wedge-shaped or approximately wedge-shaped transition piece depending on the advance of the roll stand, in particular according to WO-A-99/24183, is set.

Beim kontinuierlichen Walzen kommt es zu Dickensprüngen größer als 20 %, die hohe Anforderungen an die Einstellung der Walzstraße richten. Aufgrund der Temperatur des Walzbandes beim Warmwalzen gibt es nur geringen Spielraum zwischen Schlaufe und Einschnürung. Dies gilt um so mehr, wenn es zu Dickensprüngen von 50 % und mehr kommt. Ein Verfahren zur Verringerung von Ausschuß beim Warmwalzen entsprechender Walzbänder lehrt die WO-A-99/24183. Es ist Aufgabe der Erfindung, die Qualität des Walzguts bei einem derartigen Vorgehen weiter zu verbessern.Continuous rolling leads to jumps in thickness of more than 20%, which place high demands on the setting of the rolling mill. Due to the temperature of the rolled strip during hot rolling, there is little scope between the loop and the constriction. This applies all the more if there are thickness changes of 50% and more. WO-A-99/24183 teaches a method for reducing scrap during hot rolling of corresponding rolled strips. It is an object of the invention to further improve the quality of the rolling stock in such a procedure.

Die Aufgabe wird erfindungsgemäß durch ein Verfahren gemäß Anspruch 1 bzw. eine Einrichtung zum Walzen eines Metallbandes in einer Walzstraße gemäß Anspruch 2 gelöst.The object is achieved according to the invention by a method according to claim 1 or a device for rolling a metal strip in a rolling mill according to claim 2.

Weitere Vorteile und Einzelheiten ergeben sich aus nachfolgender Beschreibung von Ausführungsbeispielen. Im einzelnen zeigen:

FIG 1
ein Metallband variabler Dicke,
FIG 2
den Verlauf von Soll-Walzgeschwindigkeiten in Analogie zum Verfahren gemäß DE-OS 197 49 424,
FIG 3
Zusatzwerte der Soll-Walzgeschwindigkeit,
FIG 4
Soll-Walzgeschwindigkeitsverläufe bei Berücksichtigung der Voreilung des Walzgerüstes sowie der Temperatur des Metallbandes,
FIG 5
alternative Verläufe für Zusatzwerte der Sollgeschwindigkeit.
Further advantages and details emerge from the following description of exemplary embodiments. In detail show:
FIG. 1
a metal strip of variable thickness,
FIG 2
the course of nominal rolling speeds in analogy to the method according to DE-OS 197 49 424,
FIG 3
Additional values of the target rolling speed,
FIG 4
Target rolling speed curves taking into account the advance of the roll stand and the temperature of the metal strip,
FIG 5
alternative courses for additional values of the target speed.

FIG 1 zeigt ein Metallband 1 variabler Dicke als Ergebnis einer Stichplanumstellung während des Walzens. Bei Auslauf aus dem letzten Gerüst der Walzstraße weist das Metallband 1 einen Bereich 4 mit der größeren Dicke auf, die der Dicke gemäß dem alten Stichplan entspricht, sowie einen Bereich 3 geringerer Dicke, die der Dicke gemäß dem neuen Stichplan entspricht. Zwischen den beiden Bereichen 3 und 4 weist das Metallband 1 ein keilförmiges Zwischenstück 2 auf. Bei der Stichplanumstellung ändern sich im allgemeinen die Abnahmen und Auslaufdicken aller Walzgerüste. Daher werden z.B. gemäß der DE-OS 197 49 424 die Walzgerüste zeitrichtig vom alten auf den neuen Stichplan umgestellt. Eine Anpassung der Soll-Walzgeschwindigkeit in Analogie zum Vorgehen gemäß der DE-OS 197 49 424 zeigt FIG 2 für eine dreigerüstige Walzstraße. Dabei sind die Sollwerte der Walzgeschwindigkeiten v über die Zeit t dargestellt. V11 bezeichnet die Walzgeschwindigkeit des ersten Gerüstes, v21 die Walzgeschwindigkeit des zweiten Walzgerüstes und v31 die Walzgeschwindigkeit des dritten Walzgerüstes.1 shows a metal strip 1 of variable thickness as a result of a change in the pass schedule during rolling. When leaving the last stand of the rolling mill, the metal strip 1 has an area 4 with the greater thickness, which corresponds to the thickness according to the old pass schedule, and an area 3 of reduced thickness, which corresponds to the thickness according to the new pass schedule. Between the two areas 3 and 4, the metal strip 1 has a wedge-shaped intermediate piece 2. When changing the pass schedule, the acceptances and outlet thicknesses of all roll stands generally change. Therefore, for example, according to DE-OS 197 49 424, the roll stands are switched from the old to the new pass schedule at the right time. FIG. 2 shows an adaptation of the target rolling speed in analogy to the procedure according to DE-OS 197 49 424 for a three-stand rolling mill. The setpoints of the rolling speeds v are shown over time t. V11 denotes the rolling speed of the first stand, v21 the rolling speed of the second stand and v31 the rolling speed of the third stand.

FIG 3 zeigt einen Zusatzwert ΔVL der Soll-Walzgeschwindigkeit in Abhängigkeit der Zeit t. Zur besseren Darstellbarkeit ist dabei der Maßstab der Geschwindigkeit gegenüber FIG 2 und FIG 4 größer dargestellt. Der Zusatzwert ΔVL für die Soll-Walzgeschwindigkeit wird derart eingestellt, daß die Temperatur des Walzbandes möglichst genau einer gewünschten Solltemperatur entspricht. Die Sollgeschwindigkeiten gegenüber FIG 2 werden um den Zusatzwert ΔVL verändert. Das Ergebnis zeigt FIG 4. Dabei bezeichnet v12 die Soll-Walzgeschwindigkeit des ersten Gerüstes, v22 die Soll-Walzgeschwindigkeit des zweiten Gerüstes und v32 die Soll-Walzgeschwindigkeit des dritten Gerüstes.3 shows an additional value ΔV L of the target rolling speed as a function of time t. For a better representation, the scale of the speed is shown larger compared to FIG. 2 and FIG. The additional value ΔV L for the target rolling speed is set such that the temperature of the rolled strip corresponds as precisely as possible to a desired target temperature. The set speeds compared to FIG. 2 are changed by the additional value ΔV L. The result is shown in FIG 4. Here v12 denotes the target rolling speed of the first stand, v22 the target rolling speed of the second stand and v32 the target rolling speed of the third stand.

In FIG 5 sind neben dem Verlauf 4 des Zusatzwertes ΔVL gemäß FIG 3 weitere mögliche Verläufe 5, 6, 7, 8 des Zusatzwertes ΔVL dargestellt. Die Wahl eines geeigneten Verlaufes 4, 5, 6, 7, 8 für den Wert ΔVL richtet sich danach, wie die gewünschte Temperatur des Metallbandes in geeigneter Weise eingestellt wird. Außerdem können dabei Rand- oder Nebenbedingungen, wie z.B. Belastungsgrenzen der Walzantriebe, berücksichtigt werden.In addition to the course 4 of the additional value ΔV L according to FIG. 3, FIG. 5 shows further possible courses 5, 6, 7, 8 of the additional value ΔV L. The choice of a suitable course 4, 5, 6, 7, 8 for the value ΔV L depends on how the desired temperature of the metal strip is set in a suitable manner. In addition, boundary or ancillary conditions, such as load limits of the roller drives, can be taken into account.

Es ist besonders vorteilhaft, einen geeigneten Verlauf 4, 5, 6, 7, 8 für den Zusatzwert ΔVL durch Adaption, z.B. mittels eines neuronalen Netzes, zu berechnen.It is particularly advantageous to calculate a suitable profile 4, 5, 6, 7, 8 for the additional value ΔV L by adaptation, for example by means of a neural network.

Claims (2)

  1. Method for rolling a metal strip (1) in a rolling train, the rolling train having at least two rolling stands, the metal strip (1) having at least two partial areas (3, 4) of different thicknesses, which are connected to one another via a wedge-shaped or approximately wedge-shaped transition piece (2), and the rolling velocity of a rolling stand, during the rolling of the wedge-shaped or approximately wedge-shaped transition piece (2), being set as a function of the forward slip of the rolling stand, characterized in that the rolling velocity of at least one rolling stand is set with the aid of an addition value ΔVL for temperature control in the metal strip (1), and in that the rolling velocity of at least one rolling stand during the rolling of the wedge-shaped or approximately wedge-shaped transition piece (2) is also set as a function of the temperature of the metal strip (1).
  2. Device for rolling a metal strip (1) in a rolling train, the rolling train for rolling a metal strip (1) having at least two partial areas (3, 4) of different thicknesses, which are connected to one another via a wedge-shaped or approximately wedge-shaped transition piece (2), having at least two rolling stands, and means for setting the rolling velocity of a rolling stand, during the rolling of the wedge-shaped or approximately wedge-shaped transition piece (2), being provided as a function of the forward slip of the rolling stand, characterized in that the rolling device has means for controlling the rolling velocity of at least one rolling stand, the rolling velocity being set with the aid of an addition value ΔVL for temperature control in the metal strip (1) and during the rolling of the wedge-shaped or approximately wedge-shaped transition piece (2) also being set as a function of the temperature of the metal strip (1).
EP00947823A 1999-07-01 2000-06-26 Method and device for rolling a foil of varying thicknesses Expired - Lifetime EP1192014B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19930472 1999-07-01
DE19930472A DE19930472A1 (en) 1999-07-01 1999-07-01 Method and device for rolling a rolled strip of varying thickness
PCT/DE2000/002073 WO2001002109A1 (en) 1999-07-01 2000-06-26 Method and device for rolling a foil of varying thicknesses

Publications (2)

Publication Number Publication Date
EP1192014A1 EP1192014A1 (en) 2002-04-03
EP1192014B1 true EP1192014B1 (en) 2003-09-10

Family

ID=7913378

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00947823A Expired - Lifetime EP1192014B1 (en) 1999-07-01 2000-06-26 Method and device for rolling a foil of varying thicknesses

Country Status (6)

Country Link
US (1) US6922878B1 (en)
EP (1) EP1192014B1 (en)
AT (1) ATE249290T1 (en)
DE (2) DE19930472A1 (en)
RU (1) RU2246998C2 (en)
WO (1) WO2001002109A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104338748B (en) * 2013-07-24 2016-04-27 宝山钢铁股份有限公司 A kind of two passage milling methods for variable-thickness strip rolling
CN108284130A (en) * 2017-01-09 2018-07-17 宝山钢铁股份有限公司 A kind of milling method of cold rolling Varying-thickness plank

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56114513A (en) * 1980-02-16 1981-09-09 Nippon Steel Corp Changing method for thickness of strip during hot rolling work
JPS58135711A (en) * 1982-02-05 1983-08-12 Toshiba Corp Method and apparatus for controlling continuous rolling mill
JPS5982102A (en) * 1982-10-30 1984-05-12 Toshiba Corp Rolling method
DE19522494C2 (en) * 1994-07-07 1997-06-19 Siemens Ag Process for rolling a metal strip
JPH10249427A (en) * 1997-03-13 1998-09-22 Sumitomo Metal Ind Ltd Continuous hot rolling method
EP1035928A1 (en) * 1997-11-07 2000-09-20 Siemens Aktiengesellschaft Process and device for rolling a rolled strip with a variable thickness

Also Published As

Publication number Publication date
RU2246998C2 (en) 2005-02-27
EP1192014A1 (en) 2002-04-03
US6922878B1 (en) 2005-08-02
WO2001002109A1 (en) 2001-01-11
DE19930472A1 (en) 2001-01-11
ATE249290T1 (en) 2003-09-15
DE50003659D1 (en) 2003-10-16

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