EP2167248B1 - Verfahren zur walzung eines metallbandes mit einstellung der seitlichen position des bandes und dafür geeignetes walzwerk - Google Patents

Verfahren zur walzung eines metallbandes mit einstellung der seitlichen position des bandes und dafür geeignetes walzwerk Download PDF

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EP2167248B1
EP2167248B1 EP08805610.6A EP08805610A EP2167248B1 EP 2167248 B1 EP2167248 B1 EP 2167248B1 EP 08805610 A EP08805610 A EP 08805610A EP 2167248 B1 EP2167248 B1 EP 2167248B1
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Prior art keywords
strip
rolling mill
rolling
stands
values
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French (fr)
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EP2167248A1 (de
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Christian Moretto
Rémi Bonidal
Patrick Czepanski
Niis Naumann
Jamal Daafouz
Claude Iung
Uwe Koschack
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ArcelorMittal France SA
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ArcelorMittal France SA
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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
    • B21B37/68—Camber or steering control for strip, sheets or plates, e.g. preventing meandering
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • 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
    • B21B1/22—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 plates, strips, bands or sheets of indefinite length
    • B21B1/24—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/28—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 plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2273/00—Path parameters
    • B21B2273/04—Lateral deviation, meandering, camber of product
    • 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

Definitions

  • the invention relates to the rolling of metallurgical products. More specifically, it relates to the regulation of the lateral positioning of metal strips, in particular steel, inside a rolling mill.
  • thermomechanical treatments which will give it its final properties, or undergo a cold rolling which will further reduce its thickness before the completion of the final thermomechanical treatments.
  • detectors placed at each roll stand enable a value of variation of the offset of the strip at the outlet of each roll stand to be determined. If this variation exceeds a determined value, a squeeze value to be applied to each cage is then calculated and the corresponding value is applied to the most upstream cages in order to correct the offset variations noted.
  • This method does not reduce the offset between the inlet and the outlet of the mill. a cage of the finisher, a marking of the rolls of the rolling mill following an impact with the band. These defects may be due to the state of the band itself, or the mechanical disturbances that its treatment in abnormal conditions causes in the operation of the mill. In addition, the offset deteriorates the homogeneity of the thickness of the strip at the output of the finishing mill. Finally, it can hinder the successful realization of the winding of the band.
  • band offsets are also at the origin of a defect form called “sword”: a band with this defect, instead of being straight, is bent in a horizontal plane.
  • This defect is due to the existence of a wedge, that is to say a difference in thickness between the two sides of the rolled strip, whose cause may be thermal or mechanical if the heating or rolling were not performed very homogeneously over the entire width of the product.
  • the web offsets can be corrected by means of lateral guides placed between the roll stands, against which the strip comes rubbing when it deviates from its nominal path, and which reorient it towards said nominal path. But when the offset becomes very important (especially at the end of rolling, when the cage located just upstream of the cage considered released the tail of the band and therefore free to pivot to the side of the cage where the air gap cylinders is the largest), the effort that the guides must exert on the band causes friction that deteriorate its banks, sometimes going as far as folding them on themselves or pulling them off. In addition, the guides wear out and need to be replaced periodically.
  • a second method of regulating tape offset is to directly measure the decentering of the tape, as described in DE-3837101 .
  • a device such as a diode camera provided with a reference frame, which determines the absolute position of the strip with respect to the axis of the rolling mill or any other reference position, is placed between two mill stands. According to this indication, one acts if necessary on the difference between the tightenings exerted by the rolls of this cage on both banks of the band. As in the previous method, an increase in clamping on the side where the offset takes place tends to bring the band back to its nominal position. Thus, if we see that the band goes to the left, we modify the tightening to deflect to the right.
  • the object of the invention is to propose a method for rolling a strip in a rolling mill of metal products that makes it possible to effectively control the lateral position of this strip during its rolling and that makes it possible to act more accurately and quickly than existing methods, so as to avoid rolling incidents.
  • An additional advantage would be to obtain a band free of wedge and therefore saber.
  • the device according to the invention may further comprise means for filtering the raw signal for acquiring the sensors.
  • the invention finally relates to a rolling mill of metal products in the form of strips of the type comprising at least two cages and at least one device for regulating the lateral position of the band of the type according to the invention.
  • This mill may further include at least one device for regulating the position of the tail of the strip according to the invention.
  • the invention consists first of all in controlling the offset of the strip by the imposition of an additional skew at each roll stand between which the strip is in tension, each sway being calculated from representative values of the offset of the strip in all inter-cage areas.
  • This process allows to combine efficiency and speed of control, without risk for the band and the mill.
  • This skew value can be adjusted by squeezing the ends of the support rolls more or less.
  • the figure 1 shows a metal strip B being rolled in a rolling mill comprising two cages 1, 2 in which the band B is simultaneously under the influence, for example a finishing mill for the hot rolling of the steel strips.
  • Rolling mills of this type comprise usually 5, 6 or 7 cages.
  • Each cage 1, 2 comprises, conventionally, two working rolls 1a, 1a ', 2a, 2a' and two support rolls 1b, 1b ', 2b, 2b'.
  • a first sensor 4 (such as a diode camera, or any other apparatus of equivalent function) which acquires a raw signal allowing in fine to determine a value representative of the position of the band B, according to a line transverse to its direction of displacement, between the cage 1 and the cage 2, and a second sensor 5 similar to the previous one, which performs the same operation downstream of the cage 2.
  • a reference position that should normally occupy the band B in the absence of offset.
  • This reference position is generally centered on the theoretical geometric axis of the rolling mill.
  • This reference position 6 is stored in a first processing unit 7 to which are sent the raw signals collected by the sensors 4, 5, and this first processing unit 7 determines the values of the algebraic deviations ⁇ x1 and ⁇ x2 between the positions of the band B recorded respectively by the sensors 4 and 5 and the reference position 6.
  • the processing unit 7 may have to process the raw signal of the sensor to obtain a value representative of the position of the strip (B).
  • the acquisition signal consists of an image of the area covered by the camera.
  • the signal can then be processed using appropriate software to filter the active pixels and to detect the contours of the band B and thus determine its lateral position.
  • the sensors 4 and 5 will preferably be positioned perpendicular to their respective measurement zones and will have to be fixed on independent supports of the rolling mills, presenting the least possible vibration.
  • the sensor 5 can be used both to control the offset of the strip B, but also to measure its width at the exit of the rolling mill.
  • the calculated values of ⁇ x1 and ⁇ x2 are then transmitted to a second processing unit 8 which calculates the additional sway values S1 and S2 to be imposed on the cages 1 and 2.
  • the calculation of S1 and S2 is performed by multiplying the values of ⁇ x1 and ⁇ x2 by a gain matrix K.
  • a third processing unit 9 has the function of determining this gain matrix K which will be transmitted to the calculation unit 8.
  • the gain matrix K is obtained by modeling the relations linking the offsets of the strip and the shaking of the rolls of support of the rolling mill.
  • This modeling may take into account one or more quantities characteristic of the rolling process, such as the width of the rolls, the rolling force, the rotational speed of the work rolls, etc.
  • the strip to be rolled may also take into account one or more characteristics of the strip to be rolled, such as the thickness of the strip at the entrance of the rolling mill, its hardness, its temperature, etc.
  • the gain matrix K remains constant during the rolling process of a strip B, at least as long as the strip remains under the influence of the first roll stand, only the values representative of the offset of the strip being then modified at each new data acquisition cycle of sensors 4 and 5.
  • the tape leaves the grip of the first cage of rolling mill, we can use a modified gain matrix taking into account that the band is no longer under the influence of N-1 cages, if n is the total number of cage.
  • the values of the tightening instructions S1 and S2 can then be transmitted to means 10 for transmitting the instructions that will be imposed on the actuators controlling the dishing of the cages 1 and 2 (which are of a type known in themselves and not shown on the figure 1 ).
  • the method according to the invention makes it possible to control the lateral offsets of the strip with respect to its nominal position and to pass below the threshold of 10 mm, whereas the methods of the prior art do not make it possible to go below the threshold of 20 mm. mm.
  • the regulation cycle may be renewed every 50 or 100 ms, for example, the frequency being preferably chosen to ensure good stability of the regulation.
  • strip tail This part of the band is likely to rotate by relative to the rolling axis and can even form folds that damage the working rolls of the rolling mill.
  • pseudo-sensors may make it possible to mitigate the failure of one or more sensors installed on the line when they fail during a production or when the signal transmitted is unusable because of the very conditions of the process. This may be the case in areas where descaling takes place, generating a dense vapor disrupting the operation of CCD cameras, for example.
  • This use can also limit the number of actual sensors installed on the line, thus reducing the cost of investment and maintenance of the device.
  • the offset of the strip is progressively controlled to reach a stable level, below the threshold of 10 mm, whereas the offset of the strip treated according to the prior art is not not stabilized and consistently exceeds 50 mm.
  • the figure 4 corresponding to the same simulations and resumes in the upper part the five offset curves of the band according to the invention, as a function of time. It also shows in the lower part the additional swaying curves (DeltaS1 to 5) imposed on each of the five stands of the rolling mill over time and which made it possible to obtain control of the offsets and the final wedge for the strip treated according to FIG. invention. It is thus seen that by varying these additional skewings as a function of the offset values of each inter-cage, it is possible to rectify in final offsets significant existing initials due to heterogeneity due to the process. In doing so, one rectifies also the residual wedge which can also be at the origin of the localized offset.
  • the curve presented here represents the evolution of the offset at the level of each inter-cage when the method according to the invention is implemented (curve “with control") or according to the prior art (curve “without control”) . It is also verified that the method according to the invention allows a control of the offset which can thus be lowered from 37 to 10 mm in the final, when measured at 10 meters from the output of the finishing train. The method according to the prior art does not allow him to control the offset which increases steadily. Finally, there is a 63% reduced offset between the strip treated according to the invention and that treated according to the prior art, while the initial values of offset at the exit of the first cage were very close.
  • the invention is applicable, in the first place, to finishing mills for the hot rolling of steel strips. But it can find him applications on other types of rolling mills for metal strips having at least two cages in which the band is simultaneously under the influence. It will thus be possible to implement the invention for cold rolling or skin-pass metal strips, such as steel strips or ferrous or non-ferrous alloys, or even aluminum.

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

Claims (19)

  1. Verfahren zum Walzen eines Bandes (B) im Inneren einer Walzstraße für Metallprodukte, welche mindestens zwei Gerüste aufweist, welche gleichzeitig auf das besagte Band (B) einwirken, gemäß welchem die laterale Position des besagten Bandes (B) reguliert wird, wobei die Regelung den folgenden Arbeitsvorgang aufweist:
    es wird gleichzeitig nach jedem der Walzgerüste, welche auf das besagte Band (B) einwirken, ein repräsentativer Wert für die laterale Position des Bandes (B) gemäß einer Linie quer zu seiner Bewegungsrichtung bestimmt, wobei das Verfahren dadurch gekennzeichnet ist, dass algebraische Abweichungen (Δxp) zwischen den besagten Positionen und einer Referenzposition (6) berechnet werden,
    aus diesen Abweichungen (Δxp) wird ein zusätzlicher Verlagerungswert (Sp) berechnet, welcher auf jedes der besagten Walzgerüste, welche auf das besagte Band einwirken, anzuwenden ist, um die algebraischen Abweichungen (Δxp) unter eine vorbestimmte Schwelle zurückzubringen, wobei das Berechnen der besagten zusätzlichen Verlagerungswerte (Sp) ausgeführt wird, indem die besagten Abweichungswerte (Δxp) mit einer Verstärkungsfaktormatrix K multipliziert werden, welche mittels Modellierung der Beziehungen zwischen den besagten Abweichungswerten (Δxp) des Bandes und den besagten Versätze (Sp) der Zylinder der Stützen der Walzstraße bestimmt werden;
    an jedes der besagten Walzgerüste wird die jeweilige Anweisung der zusätzlichen Verlagerung (Sp) übermittelt,
    und die besagten Arbeitsvorgänge werden in vorbestimmten Zeitintervallen erneut ausgeführt, bis das besagte Band (B) nicht mehr unter der Einwirkung des letzten Gerüstes der besagten Walzstraße ist.
  2. Verfahren gemäß Anspruch 1, wobei die besagte Referenzposition (6) auf solche Art gewählt ist, dass die Ecke des besagten Bandes (B) Null ist.
  3. Verfahren gemäß Anspruch 1 oder 2, wobei die besagte Verstärkungsfaktormatrix K konstant ist, bis das besagte Band (B) nicht länger unter der Einwirkung des ersten Gerüstes der besagten Walzstraße ist.
  4. Verfahren gemäß einem der Ansprüche 1 bis 3, wobei mindestens zwei von den besagten repräsentativen Werten der lateralen Position des Bandes (B) Werte sind, welche mittels Sensoren bereitgestellt werden, welche hinter den entsprechenden Walzgerüsten angeordnet sind.
  5. Verfahren gemäß Anspruch 4, wobei mindestens einer von den besagten repräsentativen Werten der lateralen Position des Bandes (B) ein Wert ist, welcher aus den Werten berechnet wird, welche von den besagten, hinter anderen Walzgerüsten angeordneten Sensoren bereitgestellt sind, wobei die anderen repräsentativen Werte die Werte sind, welche durch die besagten Sensoren bereitgestellt sind.
  6. Verfahren gemäß Anspruch 5, wobei der besagte berechnete Wert der lateralen Position des Bandes (B) erhalten wird, indem die Parameter der besagten Verstärkungswertmatrix K verwendet werden.
  7. Verfahren gemäß Anspruch 4, wobei alle repräsentativen Werte der lateralen Position des Bandes (B) Werte sind, welche mittels der besagten Sensoren gemessen werden, welche eine Anzahl aufweisen von einem hinter jedem Gerüst der besagten Walzstraße.
  8. Verfahren gemäß einem der Ansprüche 4 bis 7, wobei die besagten Werte, welche durch die besagten Sensoren bereitgestellt werden, mittels einer Filterung des rohen erfassten Signals erhalten werden, wobei die besagte Filterung in die Berechnung die berechneten Abweichungswerte (Δxp) zwischen den besagten lateralen Positionen des Bandes (B) und der Referenzposition (6) einbezieht.
  9. Verfahren gemäß einem der Ansprüche 1 bis 8, wobei keine Anweisung für die zusätzliche Verlagerung an das betroffene Gerüst übermittelt wird, wenn die zusätzliche anzubringende Verlagerung (Sp) kleiner ist als eine vorbestimmte Schwelle.
  10. Verfahren zum Walzen eines Bandes (B) gemäß einem der Ansprüche 1 bis 10, wobei, wenn das besagte Band (B) nicht mehr unter der Einwirkung des ersten Gerüstes der besagten Walzstraße ist, die laterale Position des Teils des Bandes (B), welches immer noch unter der Einwirkung von mindestens zwei Walzgerüsten ist, und der Schwenkwinkel bezüglich einer Walzachse des Endes des Bandes (B) gleichzeitig reguliert werden, indem ein zusätzlicher Verlagerungswert berechnet und an jedes Gerüst übermittelt wird, unter dessen Einwirkung sich das Band (B) noch befindet.
  11. Verfahren gemäß Anspruch 10, wobei für jedes Gerüst der zusätzliche Verlagerungswert, welcher anzuwenden ist, bestimmt wird, indem ein repräsentativer Wert des besagten Schwenkwinkels des Endes des Bandes (B) am Eingang des Gerüstes genutzt wird.
  12. Verfahren gemäß Anspruch 11, wobei der besagte repräsentative Wert des besagten Schwenkwinkels mittels repräsentativer Werte der lateralen Position des Bandes (B) berechnet wird, welche bei den besagten Gerüsten, welche auf das Band (B) einwirken, in einer Linie quer zu seiner Bewegungsrichtung sind, wobei die besagten repräsentativen Werte in Übereinstimmung mit Ansprüchen 6 bis 10 erhalten werden.
  13. Vorrichtung zum Regulieren der lateralen Position eines Bandes (B) im Inneren einer Walzstraße für Metallprodukte, welche mindestens zwei Gerüste (1, 2) aufweist, wobei das Band (B) gleichzeitig unter der Einwirkung beider ist, aufweisend:
    Mindestens zwei Sensoren (4, 5), welche ein rohes erfasstes Signal bereitstellen, welches die Bestimmung des repräsentativen Wertes der lateralen Position des Bandes (B) ermöglicht, sind gemäß einer Linie quer zu seiner Bewegungsrichtung hinter mindestens zwei Gerüsten (1, 2) der besagten Walzstraße angeordnet, wobei die Vorrichtung gekennzeichnet ist durch:
    Mittel (7) zum Bestimmen der algebraischen Abweichungen (Δxp) zwischen den besagten repräsentativen Werten und einer Referenzposition (6),
    Mittel (8) zum Berechnen des zusätzlichen Verlagerungswerts (Sp), welcher an jedem der besagten Walzgerüste anzubringen ist, ausgehend von den besagten Abweichungen (Δxp), um die besagten algebraischen Abweichungen (Δxp) unter eine vorbestimmte Schwelle zurückzubringen,
    Mittel (9) zum Berechnen einer Verstärkungswertmatrix K, welche es ermöglicht, die besagten zusätzlichen Verlagerungswerte (Sp) mittels Multiplikation der besagten Matrix K mit den besagten Abweichungswerten (Δxp) zu erhalten, und
    Mittel (10) zum Übertragen der Anweisung für eine zusätzliche Verlagerung (Sp) jeweils an jedes von den Walzgerüsten zu vorbestimmten Zeitintervallen.
  14. Vorrichtung gemäß Anspruch 13, darüber hinaus Mittel zum Filtern des rohen erfassten Signals der besagten Sensoren aufweisend.
  15. Walzstraße für metallische Produkte in Bandform, von einer Art, welche mindestens zwei Gerüste (1, 2) und mindestens eine Vorrichtung zur Regelung der lateralen Position des Bandes (B) aufweist, von einer Art gemäß einem der Ansprüche 13 oder 14.
  16. Walzstraße gemäß Anspruch 15, dadurch gekennzeichnet, dass es sich um eine Warmband-Fertigwalzstraße zum Warmwalzen von Stahlbändern handelt.
  17. Walzstraße gemäß Anspruch 16, zwei, fünf, sechs oder sieben Walzgerüste aufweisend.
  18. Walzstraße gemäß Anspruch 15, dadurch gekennzeichnet, dass es sich um eine Walzstraße zum Kaltwalzen oder Kaltstechen von Stahlbändern handelt.
  19. Walzstraße gemäß Anspruch 18, zwei, drei, vier oder fünf Walzgerüste aufweisend.
EP08805610.6A 2007-06-11 2008-05-27 Verfahren zur walzung eines metallbandes mit einstellung der seitlichen position des bandes und dafür geeignetes walzwerk Active EP2167248B1 (de)

Applications Claiming Priority (2)

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EP07290719A EP2014380A1 (de) 2007-06-11 2007-06-11 Verfahren zum Walzen eines Metallstreifens mit Einstellung seiner Seitenposition und entsprechendes Walzwerk
PCT/FR2008/000719 WO2009004155A1 (fr) 2007-06-11 2008-05-27 Procède de laminage d'une bande métallique avec régulation de sa position latérale d'une bande et laminoir adapte

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EP2167248B1 true EP2167248B1 (de) 2013-07-10

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EP08805610.6A Active EP2167248B1 (de) 2007-06-11 2008-05-27 Verfahren zur walzung eines metallbandes mit einstellung der seitlichen position des bandes und dafür geeignetes walzwerk

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US (1) US8919162B2 (de)
EP (2) EP2014380A1 (de)
JP (1) JP5638945B2 (de)
KR (1) KR101511804B1 (de)
CN (1) CN102202806B (de)
BR (1) BRPI0812943B1 (de)
CA (1) CA2690096C (de)
RU (1) RU2449846C2 (de)
WO (1) WO2009004155A1 (de)
ZA (1) ZA200908778B (de)

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ZA200908778B (en) 2010-08-25
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WO2009004155A1 (fr) 2009-01-08
EP2014380A1 (de) 2009-01-14
CN102202806B (zh) 2016-11-09
JP5638945B2 (ja) 2014-12-10
AU2008270190A1 (en) 2009-01-08
BRPI0812943A2 (pt) 2014-12-16
WO2009004155A8 (fr) 2011-06-16
RU2449846C2 (ru) 2012-05-10
BRPI0812943B1 (pt) 2020-09-15
RU2009149180A (ru) 2011-07-20
EP2167248A1 (de) 2010-03-31
CA2690096C (fr) 2012-08-28
KR101511804B1 (ko) 2015-04-13
CA2690096A1 (fr) 2009-01-08
CN102202806A (zh) 2011-09-28
KR20100022040A (ko) 2010-02-26
US8919162B2 (en) 2014-12-30

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