EP1188493B1 - Control method for rolling a strip in a rolling stand - Google Patents
Control method for rolling a strip in a rolling stand Download PDFInfo
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- EP1188493B1 EP1188493B1 EP01120214A EP01120214A EP1188493B1 EP 1188493 B1 EP1188493 B1 EP 1188493B1 EP 01120214 A EP01120214 A EP 01120214A EP 01120214 A EP01120214 A EP 01120214A EP 1188493 B1 EP1188493 B1 EP 1188493B1
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- rolls
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- amount
- rolling
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000005096 rolling process Methods 0.000 title claims description 31
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 11
- 238000005452 bending Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000011156 evaluation Methods 0.000 claims description 4
- 238000013000 roll bending Methods 0.000 claims description 4
- 230000006978 adaptation Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 230000006399 behavior Effects 0.000 claims 1
- 210000000746 body region Anatomy 0.000 claims 1
- 230000007363 regulatory process Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 2
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000004091 panning Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
-
- 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
- B21B2203/00—Auxiliary arrangements, devices or methods in combination with rolling mills or rolling methods
- B21B2203/18—Rolls or rollers
- B21B2203/187—Tilting rolls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/18—Roll crown; roll profile
- B21B2267/19—Thermal crown
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/24—Roll wear
-
- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/42—Control of flatness or profile during rolling of strip, sheets or plates using a combination of roll bending and axial shifting of the rolls
Definitions
- the invention relates to a control method for rolling a strip in a rolling mill, comprising at least a pair of work rolls, back-up rolls and occasionally intermediate rolls, wherein one of the rolls of a set of working and / or back-up rolls to compensate for an operational asymmetric roll gap and to improve the tape an angle amount corresponding to a swing amount is pivoted relative to the backing roll.
- the work rolls are subject to both thermal and high mechanical stress. As a result, there is a thermal radial expansion of the rollers, and there is also a wear of the work rolls. Due to different conditions of the stress on the upper side of the belt and lower side of the belt, the amount of thermal radial expansion and the wear on the upper and lower rollers may be different.
- the document DE 196 18 712 A1 describes a control method for a rolling stand for rolling a strip, which consists of a pair of work rolls, a pair of back-up rolls and a pair of intermediate rolls.
- the existing regulations for rolling force, reverse bending force and roll displacement are specified target values, which were determined online in a roll stand model with a roll bending model.
- relationships between the rolling force, the rebound force and the roll displacement on the one hand and a corresponding nip course on the other hand are determined online at interpolation points in the roll bending model.
- JP-A-57-202912 discloses a control method for rolling a strip in a rolling mill, in which the contact pressures of the work rolls are detected to control the strip thickness.
- the contact pressures of the work rolls are detected to control the strip thickness.
- the invention has for its object to achieve while avoiding an asymmetric nip an improvement of the tape run, to improve the tape shape and set the same conditions on top and bottom rollers.
- the shape of the work rolls is not calculated, but measured online and used to determine the pivoting amount and / or the corresponding roll displacement position with the above-mentioned steps.
- An advantageous embodiment of the invention is characterized in that instead of a pivoting of the set of rollers, the analog effect is realized by using different work roll bending forces of the left and right sides.
- the online determined pivoting amount or the differential bending force is set before the tap of the tape and changed if necessary over the tape length.
- An embodiment of the method provides that in order to compensate for unequal rolling conditions in the nip between the upper and lower rolls of a set of work rolls, a calculable amount of a swivel angle ⁇ is set on one of the rolls, preferably on the upper roll.
- a further embodiment provides that a pivoting amount of a set of rolls, for example, is carried out on a scaffold whose working or intermediate rolls are axially displaced.
- Another embodiment of the method provides that a pivoting amount of a set of rolls, for example, is carried out on a scaffold, the working or intermediate rolls are not moved.
- control method according to the invention is characterized by the specified steps and the conversion of the determined wedge shape of the roll gap for the corresponding effective ranges linearly to the distance between the jobs or the storage distance and totaling the amount.
- a complementary measure to minimize the asymmetry is to shift the top and bottom rollers differently, so that U is not equal to ( ⁇ ) U '. This can be done for several bands of a rolling program or only for selected bands.
- roller with z. B. further wear, d. H. you set a larger displacement amplitude.
- the differential shift amount between the two rollers must be set in a predetermined permissible search range in such a way that the asymmetry is minimized, primarily in the band edge region.
- the control algorithm also takes into account the different elastic behavior at different shift amounts of top and bottom rollers, so that these additional influences, eg. B. be compensated by different bending force levels, on the right and left sides or panning.
- the shift position is optimized and set in the second step, the swing amount.
- the contours of the work rolls 1, 1 'in Figure 1 show an approximately symmetrical thermal expansion in a state for an unloaded scaffold with non-shifted work rolls 1, 1'.
- the upper work roll 1 has a much more pronounced thermal crown than the lower work roll 1 '.
- the aim of the measures according to the invention is to reduce or eliminate the conditions of such an asymmetry. If these can not be reduced by the known means such as different cooling or roll gap lubrication, an automatic pivoting of the set of rolls is proposed according to the invention in order to increase the undesired effect of the asymmetry compensate.
- the larger gap between the work rolls 1, 1 'and working and support rolls 2, 2' of the left side is fed in by the amount "S", or it becomes right around the center of the stand and swung left by the amount S / 2.
- the determined or calculated pivot amounts "S" can change in accordance with a change in the thermal crown over the tape length, which must be taken into account from case to case.
- the shapes of the upper 1 and lower work rolls 1 'are present it is possible to calculate the roll gap in the range of the bandwidth for the shifted work roll state, as shown in FIG.
- the oblique position or wedging of the roll gap results.
- the subsequently determined compensation angle ⁇ WS (alpha) yields for the range of the bandwidth B the required proportion of the pivoting amount "S WS " in the nip. This amount can be extrapolated by simple conversion to the distance between the jobs.
- the invention optimally solves the problem initially posed.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Metal Rolling (AREA)
Abstract
Description
Die Erfindung betrifft ein Regelverfahren zum Walzen eines Bandes in einem Walzgerüst, umfassend zumindest ein Paar Arbeitswalzen, Stützwalzen sowie fallweise auch Zwischenwalzen, wobei zur Kompensation eines betriebsbedingt asymmetrischen Walzspaltes und zur Verbesserung des Bandlaufes eine der Walzen eines Walzensatzes von Arbeits- und/oder Stützwalzen um einen Winkelbetrag, entsprechend einem Schwenkbetrag, relativ zur Gegenwalze geschwenkt wird.The invention relates to a control method for rolling a strip in a rolling mill, comprising at least a pair of work rolls, back-up rolls and occasionally intermediate rolls, wherein one of the rolls of a set of working and / or back-up rolls to compensate for an operational asymmetric roll gap and to improve the tape an angle amount corresponding to a swing amount is pivoted relative to the backing roll.
Während des Walzprozesses unterliegen die Arbeitswalzen einer sowohl thermischen, als auch einer hohen mechanischen Belastung. Als Folge hiervon ergibt sich eine thermische Radial-Ausdehnung der Walzen, und es stellt sich zusätzlich ein Verschleiß der Arbeitswalzen ein. Infolge unterschiedlicher Bedingungen der Beanspruchung an Bandoberseite und Bandunterseite kann der Betrag einer thermischen Radial-Ausdehnung sowie des Verschleißes an Ober- und Unterwalze unterschiedlich sein.During the rolling process, the work rolls are subject to both thermal and high mechanical stress. As a result, there is a thermal radial expansion of the rollers, and there is also a wear of the work rolls. Due to different conditions of the stress on the upper side of the belt and lower side of the belt, the amount of thermal radial expansion and the wear on the upper and lower rollers may be different.
Beim Einsatz von verschiebbaren Arbeitswalzen kann dies zu asymmetrischen Bedingungen im Walzgerüst führen. Dabei kann in einem Walzgerüst z. B. eine obere Arbeitswalze einen wesentlich höheren thermischen Crown aufweisen als die Unterwalze. Hinzu kommt, dass auch der Verschleiß einzelner Arbeitswalzen erhebliche Unterschiede aufweisen kann. Im Falle der Einstellung einer vergleichsweise großen Änderung der axialen Schiebeposition stellt sich dadurch ein unterschiedlicher Spaltverlauf zwischen den Walzen eines Walzenpaares auf der rechten und linken Seite ein. Unter Last ergibt sich dadurch ein asymmetrischer, d. h. keilförmiger Walzspalt.When using displaceable work rolls, this can lead to asymmetric conditions in the roll stand. In this case, in a rolling mill z. B. an upper work roll having a much higher thermal crown than the lower roll. In addition, the wear of individual work rolls can have considerable differences. In the case of setting a comparatively large change in the axial sliding position thereby sets a different gap profile between the rollers of a pair of rollers on the right and left side. Under load, this results in an asymmetric, ie wedge-shaped roll gap.
Zur Verminderung einer derartigen Asymmetrie ist es beim Stand der Technik bekannt, die obere und untere Arbeitswalze unterschiedlich zu kühlen, wobei mit unterschiedlichen Mengen an Kühlmittel, z. B. Wasser, gefahren wird. Falls die Walzspaltschmierung aktiv ist, kann auch von der Maßnahme Gebrauch gemacht sein, dass unterschiedliche Ölmengen an Ober- bzw. Unterwalze eingestellt werden. Dadurch können größere Unterschiede von thermischem Crown bzw. im Verschleißverhalten mindestens teilweise relativiert werden.To reduce such asymmetry, it is known in the prior art to cool the upper and lower work rolls differently, using different amounts of coolant, e.g. B. water, is driven. If the roll gap lubrication is active, can also be made of the measure that different amounts of oil are adjusted to top or bottom roll. As a result, larger differences in thermal crown or wear behavior can be at least partially relativised.
Das Dokument DE 196 18 712 A1 beschreibt ein Regelverfahren für ein Walzgerüst zum Walzen eines Bandes, das aus einem Paar Arbeitswalzen, einem Paar Stützwalzen und einem Paar Zwischenwalzen besteht. Den dabei vorhandenen Regelungen für Walzkraft, Rückbiegekraft und Walzenverschiebung werden Sollwerte vorgegeben, die in einem Walzgerüstmodell mit einem Walzenbiegemodell online ermittelt wurden. Zur Ermittlung der Sollwerte für Walzkraft, Rückbiegekraft und Walzenverschiebung werden in dem Walzenbiegemodell online an Stützstellen Beziehungen zwischen der Walzkraft, der Rückbiegekraft und der Walzenverschiebung einerseits und einem korrespondierenden Walzspaltverlauf andererseits ermittelt.The document DE 196 18 712 A1 describes a control method for a rolling stand for rolling a strip, which consists of a pair of work rolls, a pair of back-up rolls and a pair of intermediate rolls. The existing regulations for rolling force, reverse bending force and roll displacement are specified target values, which were determined online in a roll stand model with a roll bending model. In order to determine the setpoint values for rolling force, reverse bending force and roll displacement, relationships between the rolling force, the rebound force and the roll displacement on the one hand and a corresponding nip course on the other hand are determined online at interpolation points in the roll bending model.
Dem Dokument ist weiterhin zu entnehmen, dass derartige Regelverfahren weit verbreitet sind. Ebenso sind Differentialgleichungen zur Berechnung der Durchbiegungen und Kraftverläufe in den Walzen sowie Lösungen dieser Differentialgleichungen im Prinzip bekannt.The document also indicates that such regulatory procedures are widespread. Likewise, differential equations for the calculation of the deflections and force profiles in the rolls as well as solutions of these differential equations are known in principle.
Aus der JP-A-57-202912 ist ein Regelverfahren beim Walzen eines Bandes in einem Walzgerüst bekannt, bei dem zur Kontrolle der Banddicke die Anpressdrücke der Arbeitswalzen erfasst werden. Bei Abweichungen der Banddicke von einem vorgegebenen Sollwert durch eine vorhandene Keiligkeit des Bandes werden durch unterschiedliches Anstellen der hydraulischen Anpresszylinder die ausgeübten Anpressdrücke so verändert, dass eine Schiefstellung der Arbeitswalzen erfolgt, durch die dann die Keiligkeit behoben wirdJP-A-57-202912 discloses a control method for rolling a strip in a rolling mill, in which the contact pressures of the work rolls are detected to control the strip thickness. In case of deviations of the strip thickness of a predetermined setpoint by an existing wedging of the band are exercised by different hiring the hydraulic pressure cylinder Contact pressure changed so that a skewing of the work rolls takes place, which then the wedging is resolved
Weiterhin ist aus der WO-A-95/19591 ein Verfahren zur Führung eines Prozesses bekannt, wobei als Prozessbeispiel das Walzen von Walzgut in einer Walzanlage mit Arbeitswalzen, Zwischenwalzen und Stützwalzen beschrieben wird. Als Ausgangsgröße dieses Prozesses dient die Planheit des Walzgutes, während die Stellgrößen aus an sich bekannten Mitteln zum Schwenken, Biegen, axialem Verschieben der Arbeitswalzen und/oder der Zwischenwalzen und/oder der Walzkraft bestehen.Furthermore, from WO-A-95/19591 a method for guiding a process is known, wherein as a process example the rolling of rolling stock in a rolling mill with work rolls, intermediate rolls and back-up rolls is described. The output of this process is the flatness of the rolling stock, while the manipulated variables consist of known means for pivoting, bending, axial displacement of the work rolls and / or the intermediate rolls and / or the rolling force.
Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, unter Vermeidung eines asymmetrischen Walzspaltes eine Verbesserung des Bandlaufs zu erzielen, die Bandform zu verbessern und gleiche Bedingungen an Ober- und Unterwalzen einzustellen.Based on the aforementioned prior art, the invention has for its object to achieve while avoiding an asymmetric nip an improvement of the tape run, to improve the tape shape and set the same conditions on top and bottom rollers.
Die gestellte Aufgabe wird durch die kennzeichnenden Merkmale des Anspruchs 1 dadurch gelöst, dass die zur Kompensation eines betriebsbedingten asymmetrischen Walzspaltes und zur Verbesserung des Bandlaufs mit einer der Walzen eines Walzensatzes von Arbeits- und/oder Stützwalzen relativ zur Gegenwalze durchgeführte Schwenkung um einen bestimmten Winkelbetrag, bzw. einem Schwenkbetrag mit den folgenden Arbeitsschritten ermittelt wird:
- ■ Messung des thermischen Crowns sowie des Verschleißzustandes am Arbeitswalzenpaar für verschiedene Walzprogramme,
- ■ Adaption der Verschleißkoeffizienten und Bewertung der Wärmeströme,
- ■ Berechnung des thermischen Crowns sowie des Arbeitswalzenverschleißes für die obere und untere Arbeitswalze unter Online-Bedingungen,
- ■ Errechnen des Walzspaltes für den verschobenen Zustand der Arbeitswalzen sowie Errechnen der Schräglage und/oder Keilform des Walzspaltes im Bereich der Bandbreite bei Vorliegen der Formen der beiden Arbeitswalzen,
- ■ Auswerten der Keilform des Walzenspaltes und dessen Schräglage für den Kontaktbereich zwischen Arbeits- und Stützwalzen,
- ■ Umrechnen der ermittelten Keilformen für die entsprechenden Wirkbereiche linear auf den Abstand der Anstellungen bzw. den Lagerabstand und Aufsummieren des Betrages entsprechend der folgenden Beziehung:
- ■ Measurement of the thermal crown as well as the wear condition on the pair of work rolls for different rolling programs,
- ■ adaptation of the wear coefficients and evaluation of the heat flows,
- ■ calculation of thermal crown and work roll wear for the upper and lower work rolls under online conditions,
- Calculating the roll gap for the shifted state of the work rolls and calculating the skew and / or wedge shape of the roll gap in the range of the bandwidth in the presence of the shapes of the two work rolls,
- ■ evaluating the wedge shape of the nip and its skew for the contact area between working and support rollers,
- ■ Conversion of the determined wedge shapes for the corresponding effective ranges linearly to the distance of the jobs or the bearing distance and totaling the amount according to the following relationship:
Darin bedeuten:
- B :
- Bandbreite
- Kws :
- Wichtungsfaktor des Betrages im Walzspalt
- KAS :
- Wichtungsfaktor des Effekts zwischen Arbeits- und Stützwalze
- LA :
- Lagerabstand bzw. Abstand der Anstellungen
- LKont :
- Kontaktlänge zwischen Arbeits- und Stützwalze
- S :
- Schwenkbetrag
- Sws :
- Schräglage im Walzspalt
- SAS :
- Anteil Schräglage zwischen Arbeits- und Stützwalze
- B:
- bandwidth
- K ws :
- Weighting factor of the amount in the nip
- K AS :
- Weighting factor of the effect between working and support roller
- L A :
- Bearing clearance or distance between jobs
- Lcont :
- Contact length between working and support roller
- S:
- swing amount
- S ws :
- Slope in the nip
- S AS :
- Proportion of inclination between working and support roller
In einer Ausgestaltung der Erfindung wird die Form der Arbeitswalzen nicht errechnet, sondern online gemessen und daraus der Schwenkbetrag oder/und die entsprechende Walzenverschiebeposition mit den oben genannten Arbeitsschritten bestimmt.In one embodiment of the invention, the shape of the work rolls is not calculated, but measured online and used to determine the pivoting amount and / or the corresponding roll displacement position with the above-mentioned steps.
Eine vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass anstelle einer Schwenkung des Walzensatzes die analoge Wirkung durch Einsatz unterschiedlicher Arbeitswalzenbiegekräfte der linken und rechten Seite realisiert wird.An advantageous embodiment of the invention is characterized in that instead of a pivoting of the set of rollers, the analog effect is realized by using different work roll bending forces of the left and right sides.
Nach der Erfindung wird der online ermittelte Schwenkbetrag bzw. die Differenzbiegekraft vor Anstich des Bandes eingestellt und bei Bedarf über die Bandlänge verändert.According to the invention, the online determined pivoting amount or the differential bending force is set before the tap of the tape and changed if necessary over the tape length.
Eine Ausgestaltung des Verfahrens sieht vor, dass zur Kompensation ungleicher Walzbedingungen im Walzspalt zwischen Ober- und Unterwalze eines Arbeitswalzensatzes ein errechenbarer Betrag eines Schwenkwinkels α an einer der Walzen, bevorzugt an der Oberwalze, eingestellt wird.An embodiment of the method provides that in order to compensate for unequal rolling conditions in the nip between the upper and lower rolls of a set of work rolls, a calculable amount of a swivel angle α is set on one of the rolls, preferably on the upper roll.
Eine weitere Ausgestaltung sieht vor, dass ein Schwenkbetrag eines Walzensatzes, beispielsweise an einem Gerüst vorgenommen wird, dessen Arbeits- oder Zwischenwalzen axial verschoben sind.A further embodiment provides that a pivoting amount of a set of rolls, for example, is carried out on a scaffold whose working or intermediate rolls are axially displaced.
Eine andere Ausgestaltung des Verfahrens sieht vor, dass ein Schwenkbetrag eines Walzensatzes, beispielsweise an einem Gerüst vorgenommen wird, dessen Arbeits- oder Zwischenwalzen nicht verschoben sind.Another embodiment of the method provides that a pivoting amount of a set of rolls, for example, is carried out on a scaffold, the working or intermediate rolls are not moved.
Das Regelverfahren nach der Erfindung ist gekennzeichnet durch die angegebenen Arbeitsschritte und die zum Umrechnen der ermittelten Keilform des Walzspaltes für die entsprechenden Wirkbereiche linear auf den Abstand der Anstellungen bzw. den Lagerabstand und Aufsummieren des Betrages.The control method according to the invention is characterized by the specified steps and the conversion of the determined wedge shape of the roll gap for the corresponding effective ranges linearly to the distance between the jobs or the storage distance and totaling the amount.
Eine ergänzende Maßnahme, die Asymmetrie zu minimieren, besteht darin, die Ober- und Unterwalze unterschiedlich weit zu verschieben, so dass U ungleich (≠) U' beträgt. Dies kann für mehrere Bänder eines Walzprogramms oder nur für ausgewählte Bänder erfolgen.A complementary measure to minimize the asymmetry is to shift the top and bottom rollers differently, so that U is not equal to (≠) U '. This can be done for several bands of a rolling program or only for selected bands.
Beim zyklischen Verschieben der Arbeitswalzen können unterschiedliche Verschiebeniveaus und -steps für Ober- und Unterwalze eingestellt werden, um die Form (Steilheit) von Verschleiß und thermischen Crowns positiv zu beeinflussen. Vorzugsweise wird die Walze mit z. B. größerem Verschleiß weiter verschoben, d. h. man stellt eine größere Verschiebeamplitude ein.With cyclic shifting of the work rolls, different shift levels and steps for upper and lower rolls can be adjusted to positively influence the shape (slope) of wear and thermal crowns. Preferably, the roller with z. B. further wear, d. H. you set a larger displacement amplitude.
Beim Presetting für das jeweilige Band ist der Differenz-Schiebebetrag zwischen den beiden Walzen in einem vorgegebenen zulässigen Suchbereich so einzustellen, dass die Asymmetrie vornehmlich im Bandkantenbereich minimiert wird.During presetting for the respective band, the differential shift amount between the two rollers must be set in a predetermined permissible search range in such a way that the asymmetry is minimized, primarily in the band edge region.
Die Vorgehensweise bei dieser Optimierung erfolgt u. a. nach der in den Dokumenten EP 0 618 020 B1 und EP 0 850 704 A1 beschriebenen Methode. Die Optimierung der Kontur und der randnahen Planheit werden jedoch auf die asymmetrischen Effekte übertragen, d. h. es werden beide Bandseiten betrachtet.The procedure for this optimization is u. a. according to the method described in documents EP 0 618 020 B1 and EP 0 850 704 A1. However, contour optimization and near-flat flatness are transferred to the asymmetric effects; H. Both sides of the band are considered.
Der Regelalgorithmus berücksichtigt auch das unterschiedliche elastische Verhalten bei unterschiedlichen Verschiebebeträgen an Ober- und Unterwalze, so dass diese zusätzlichen Einflüsse, z. B. durch unterschiedliche Biegekraftniveaus, auf der rechten und linken Seite oder Schwenken kompensiert werden.The control algorithm also takes into account the different elastic behavior at different shift amounts of top and bottom rollers, so that these additional influences, eg. B. be compensated by different bending force levels, on the right and left sides or panning.
Es ist vorgesehen, die beiden obigen Maßnahmen miteinander zu kombinieren, wobei das Schwenken des Walzensatzes auf den Bodybereich des Bandes und das Einstellen unterschiedlicher Verschiebepositionen mehr an der Bandkante wirken. Vorzugswiese wird zuerst die Verschiebeposition optimiert und im zweiten Schritt der Schwenkbetrag festgelegt.It is intended to combine the above two measures with each other, wherein the pivoting of the set of rollers on the body portion of the band and the setting of different displacement positions more at the band edge Act. Preferably, first, the shift position is optimized and set in the second step, the swing amount.
Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Erläuterung einiger in den Zeichnungen schematisch dargestellter Ausführungsbeispiele.Further details, features and advantages of the invention will become apparent from the following explanation of some schematically illustrated in the drawings embodiments.
Es zeigen:
- Fig. 1
- einen Zustand für ein unbelastetes Gerüst mit nicht verschobenen Arbeitswalzen und überlagerten Stützwalzen,
- Fig. 2
- einen Zustand gemäß Fig. 1, jedoch mit axial verschobenen Arbeitswalzen,
- Fig. 3
- einen unsymmetrischen Walzspalt mit einer eingezeichneten Ausgleichsgeraden im Bereich der Bandbreite bei verschobenen Arbeitswalzen,
- Fig. 4
- eine Asymmetrie im Kontaktbereich zwischen Arbeits- und Stützwalzen,
- Fig. 5
- eingestellte Verschiebepositionen an Ober- und Unterwalze in Abhängigkeit der Anzahl gewalzter Bänder,
- Fig. 6
- Arbeitswalzen-Verschiebepositionen und Walzspaltdifferenzen bei unterschiedlichen Verschiebestrategien.
- Fig. 1
- a condition for an unloaded scaffold with non-displaced work rolls and superposed back-up rolls,
- Fig. 2
- a state according to FIG. 1, but with axially displaced work rolls,
- Fig. 3
- an asymmetrical nip with an indicated equalization line in the range of the bandwidth at shifted work rolls,
- Fig. 4
- an asymmetry in the contact area between working and support rollers,
- Fig. 5
- set shift positions on upper and lower rollers depending on the number of rolled belts,
- Fig. 6
- Work roll shifting positions and roll gap differences with different shifting strategies.
Hierin bedeuten:
- B :
- Bandbreite
- LKont :
- Kontaktlänge zwischen Arbeits- und Stützwalzen
- LA :
- Lagerabstand/Abstand der Anstellung der Stützwalzen
- S :
- Schräglage/Schwenkbetrag
- U :
- Arbeitswalzen-Verschiebung der Oberwalze
- U' :
- Arbeitswalzen-Verschiebung der Unterwalze (in Gegenrichtung)
- n :
- Anzahl der Bänder
- α :
- Schwenkwinkel
- B:
- bandwidth
- Lcont :
- Contact length between working and support rollers
- L A :
- Bearing distance / distance between the adjustment of the support rollers
- S:
- Tilt / swivel amount
- U:
- Stripper shift of top roller
- U ':
- Work roll displacement of the lower roll (in the opposite direction)
- n:
- Number of bands
- α:
- swivel angle
Die Konturen der Arbeitswalzen 1, 1' in Figur 1 zeigen bei einem Zustand für ein unbelastetes Gerüst mit nicht verschobenen Arbeitswalzen 1, 1' eine annähernd symmetrische thermische Ausdehnung. Die obere Arbeitswalze 1 besitzt jedoch einen deutlich ausgeprägteren thermischen Crown als die untere Arbeitswalze 1'.The contours of the work rolls 1, 1 'in Figure 1 show an approximately symmetrical thermal expansion in a state for an unloaded scaffold with non-shifted work rolls 1, 1'. However, the
Beim Einsatz von verschiebbaren Arbeitswalzen 1, 1' kann dies zu asymmetrischen Bedingungen im Walzgerüst führen. Diese Bedingungen zeigt Figur 2. Dargestellt ist ebenfalls ein unbelastetes Walzgerüst, dessen obere Arbeitswalze 1 beispielsweise einen wesentlich höheren thermischen Crown aufweist als die Unterwalze 1'. Auch der Arbeitswalzenverschleiß ist unterschiedlich. Falls eine relativ große Schiebepositionsänderung von Band zu Band (beispielsweise U = 60 mm) erfolgt, so stellt sich dadurch ein unterschiedlich großer Spalt zwischen den Walzen 1, 1' bzw. 1, 2 und 1', 2' auf der rechten und linken Seite ein. Unter Last ergibt sich dadurch ein asymmetrischer keilförmiger Walzspalt.When using displaceable work rolls 1, 1 ', this can lead to asymmetric conditions in the roll stand. These conditions are shown in FIG. 2. Also shown is an unloaded rolling stand, whose
Ziel der erfindungsgemäßen Maßnahmen ist es, die Bedingungen einer solchen Asymmetrie zu vermindern bzw. zu eliminieren. Lassen sich diese mit den bekannten Mitteln wie unterschiedliche Kühlung oder Walzspaltschmierung nicht reduzieren, so wird nach der Erfindung ein automatisches Schwenken des Walzensatzes vorgeschlagen, um den unerwünschten Effekt der Asymmetrie zu kompensieren.The aim of the measures according to the invention is to reduce or eliminate the conditions of such an asymmetry. If these can not be reduced by the known means such as different cooling or roll gap lubrication, an automatic pivoting of the set of rolls is proposed according to the invention in order to increase the undesired effect of the asymmetry compensate.
Dabei wird gemäß der im Beispiel von Fig. 2 gezeigten Vorgehensweise der größere Spalt zwischen den Arbeitswalzen 1,1' und Arbeits- sowie Stützwalzen 2, 2' der linken Seite um den Betrag "S" zugefahren, bzw. es wird um die Ständermitte rechts und links um den Betrag S/2 geschwenkt. Dabei können sich die ermittelten bzw. errechneten Schwenkbeträge "S" entsprechend einer Änderung des thermischen Crowns über der Bandlänge verändern, was von Fall zu Fall zu berücksichtigen ist.In this case, according to the procedure shown in the example of FIG. 2, the larger gap between the work rolls 1, 1 'and working and support rolls 2, 2' of the left side is fed in by the amount "S", or it becomes right around the center of the stand and swung left by the amount S / 2. In this case, the determined or calculated pivot amounts "S" can change in accordance with a change in the thermal crown over the tape length, which must be taken into account from case to case.
Liegen die Formen der oberen 1 und unteren Arbeitswalze 1' vor, so lässt sich für den verschobenen Arbeitswalzenzustand der Walzspalt im Bereich der Bandbreite errechnen, wie dies in der Figur 3 gezeigt ist. Dabei ergibt sich mittels der Bestimmung einer Ausgleichsgeraden durch die Walzspaltdifferenz die Schräglage bzw. Keiligkeit des Walzspaltes. Der danach ermittelbare Ausgleichswinkel αWS (Alpha) ergibt für den Bereich der Bandbreite B den erforderlichen Anteil des Schwenkbetrages "SWS" im Walzspalt. Dieser Betrag lässt sich durch einfache Umrechnung auf den Abstand der Anstellungen hochrechnen.If the shapes of the upper 1 and lower work rolls 1 'are present, it is possible to calculate the roll gap in the range of the bandwidth for the shifted work roll state, as shown in FIG. In this case, by means of the determination of a compensation straight line through the roll gap difference, the oblique position or wedging of the roll gap results. The subsequently determined compensation angle α WS (alpha) yields for the range of the bandwidth B the required proportion of the pivoting amount "S WS " in the nip. This amount can be extrapolated by simple conversion to the distance between the jobs.
Weil zwischen Arbeits- und Stützwalzen 1, 1' / 2, 2' ebenfalls die Asymmetrien wirken, erfolgt die gleiche Auswertung der Keiligkeit für den Kontaktbereich zwischen Arbeits- und Stützwalze, wie in Figur 4 gezeigt. Die Summe der beiden Effekte (im Walzspalt und zwischen den Stütz- und Arbeitswalzen) führt zu dem Schwenkbetrag "S".Because the asymmetries also act between working and
Um die Form des Arbeitswalzenverschleißes und des thermischen Crowns zu beeinflussen werden - wie aus der Literatur bekannt ist - die Arbeitswalzen zyklisch verschoben. Bei unterschiedlichem Verschleiß oder thermischen Crowns an Ober- und Unterseite kann es positiv sein, oben und unten unterschiedliche Verschiebebeträge (U, U') für jedes Band eines Walzprogramms einzustellen, was Figur 5 zeigt. Bei Einstellung unterschiedlicher Verschiebeamplituden und -steps wird vornehmlich der Effekt des Arbeitswalzenverschleißes im Bandkantenbereich effektiv beeinflusst.In order to influence the shape of the work roll wear and the thermal crowns, as is known from the literature, the work rolls are cyclically displaced. With different wear or thermal crowns on the top and bottom, it may be positive, above and below different shift amounts (U, U ') for each band of a rolling program set, which Figure 5 shows. By setting different shift amplitudes and steps, the effect of work roll wear in the band edge area is effectively influenced.
Die Wirkung unterschiedlicher Verschiebepositionen im Walzspalt bei wesentlich höherem Verschleiß z. B. der Unterwalze macht das Extrembeispiel der Figur 6 deutlich. Diese zeigt die Arbeitswalzen im verschobenen Zustand und darunter die zugehörigen Walzspaltdifferenzen. Es werden Effekte mit konventioneller Verschiebestrategie (links) und mit ungleicher optimierter Verschiebeposition an Ober- und Unterwalze (rechts) dargestellt. Durch den Optimierungsprozess für das jeweilige Band werden die Asymmetrien im Bereich des Bandes (Bandkante) minimiert, was Fig. 6 unten rechts deutlich macht.The effect of different displacement positions in the nip at much higher wear z. B. the lower roller makes the extreme example of Figure 6 clearly. This shows the work rolls in the shifted state and below the associated roll gap differences. Effects with conventional shift strategy (left) and with unequal optimized shift position on upper and lower rollers (right) are shown. The optimization process for the respective band minimizes the asymmetries in the region of the band (band edge), as shown in FIG. 6, bottom right.
Die Erfindung löst in optimaler Weise die eingangs gestellte Aufgabe.The invention optimally solves the problem initially posed.
Claims (12)
- Regulating method for rolling a strip in a roll stand, comprising at least one pair of working rolls (1, 1'), backing rolls (2, 2') as well as if needed also intermediate rolls, wherein in order to provide compensation for an operationally caused asymmetrical rolling gap and for improvement in the strip running one of the rolls of a roll set of working rolls (1, 1') and/or backing rolls (2, 2') is pivoted relative to the counter roller by an angular amount (α) corresponding with a pivot amount (S), characterised in that the pivot amount (S) is ascertained by the following working steps:- measurement of the thermal crown as well as the wear state at the working roll pair (1,1') for different rolling programs,- adaptation of the wear coefficients and evaluation of the heat flows,- calculation of the thermal crown as well as the working roll wear for the upper working roll (1) and lower working roll (1') under on-line conditions,- calculation of the rolling gap for the displaced state of the working rolls (1, 1') as well as calculation of the skew position and/or wedge shape of the rolling gap in the region of the strip width in the case of presence of the forms of the two working rolls (1,1'),- evaluation of the wedge shape of the rolling gap and the skew position thereof for the contact region (LKont) between working rolls and backing rolls,- recalculation of the ascertained wedge shapes for the corresponding effective regions linearly to the spacing of the adjustments or the bearing spacing (LA) and summation of the amount in correspondence with the following equation:wherein:B = strip widthKWS = weighting factor of the amount in the rolling gapKAS = weighting factor of the effect between working roll and backing rollLA = bearing spacing or spacing of the adjustmentsLKont = contact length between working roll and backing rollS = pivot amountSWS = skew position in the rolling gapSAS = proportion of skew position between working roll and backing roll
- Regulating method according to claim 1, characterised in that the form of the working rolls (1, 1') is not calculated, but measured on line and the pivot amount (S) and/or the corresponding roll displacement position is or are determined therefrom.
- Regulating method according to claim 1 or 2, characterised in that instead of pivotation of the roll set the analogous effect is realised by use of different working roll bending forces of the lefthand side and righthand side.
- Regulating method according to claim 3, characterised in that the pivot amount (S) determined on line or the difference bending force is set prior to the initial pass of the strip and in the case of need is varied over the strip length.
- Regulating method according to one of claims 1 to 4, characterised in that the calculable amount of the pivot angle (α) or the pivot amount (S) for compensation of non-uniform rolling conditions in the rolling gap between upper roll (1) and lower roll (1') of a working roll set (1, 1') is set at one of the rolls, preferably at the upper roll (1').
- Regulating method according to one of claims 1 to 5, characterised in that in order to assist the effect of the method a pivot amount (S) of a roll set (1, 1' or 2, 2') is undertaken at a stand, the working rolls (1, 1') or intermediate rolls (3, 3') of which are axially displaced relative to one another to a different extent by an amount U or U'.
- Regulating method according to claim 6, characterised in that the pivotation of the roll set onto the body region of the strip and the setting of different displacement positions are oriented more to the strip edge.
- Regulating method according to claim 7, characterised in that the displacement position is optimised in the first step and the pivot amount is fixed in the second step.
- Regulating method according to claim 6, 7 or 8, characterised in that different bending forces are set at the top and bottom or at the right and the left or the pivot amount (S) is corrected in order to take into consideration different elastic behaviours of the rolls of a roll set in the case of non-uniform displacement amounts.
- Regulating method according to one of claims 1 to 9, characterised in that for several strips of a rolling program the upper and lower working rolls are cyclically displaced to different extents for positive influencing of the wear pattern.
- Regulating method according to claim 10, characterised in that a larger displacement amplitude is set for the rolls with greater wear or greater thermal crown.
- Regulating method according to claim 11, characterised in that the difference amount between the two rolls for individual strips is so set in a predetermined permissible search range that the asymmetry is minimised primarily in the strip edge region.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10045259 | 2000-09-13 | ||
DE10045259A DE10045259A1 (en) | 2000-09-13 | 2000-09-13 | Control method for rolling a strip in a roll stand |
Publications (4)
Publication Number | Publication Date |
---|---|
EP1188493A2 EP1188493A2 (en) | 2002-03-20 |
EP1188493A3 EP1188493A3 (en) | 2004-04-07 |
EP1188493B1 true EP1188493B1 (en) | 2006-06-21 |
EP1188493B2 EP1188493B2 (en) | 2009-05-20 |
Family
ID=7656050
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01120214A Expired - Lifetime EP1188493B2 (en) | 2000-09-13 | 2001-08-23 | Control method for rolling a strip in a rolling stand |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1188493B2 (en) |
AT (1) | ATE330724T1 (en) |
DE (2) | DE10045259A1 (en) |
ES (1) | ES2266062T5 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2691188B1 (en) | 2011-05-24 | 2015-06-17 | Siemens Aktiengesellschaft | Operating method for a rolling train |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005055530A1 (en) † | 2005-11-22 | 2007-05-24 | Sms Demag Ag | Setting process for roller segment in continuous casting machine involves controlling setting elements of roller segments individually to coordinate side edges |
CN114798756B (en) * | 2022-04-13 | 2022-11-11 | 北京科技大学 | Multi-frame working roller shifting method for eliminating local high points of plate strip |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5947609B2 (en) * | 1979-04-26 | 1984-11-20 | 新日本製鐵株式会社 | Rolling method to prevent bending of rolled material |
DE3020427A1 (en) † | 1980-04-29 | 1981-12-03 | Siemens AG, 1000 Berlin und 8000 München | Control program development aid for complex systems - generates warnings, instructions and data corresp. to system conditions |
JPS57202912A (en) * | 1981-06-05 | 1982-12-13 | Kawasaki Steel Corp | Thick plate rolling process |
DE3435232A1 (en) * | 1984-09-26 | 1986-04-17 | Hoesch Stahl AG, 4600 Dortmund | METHOD AND DEVICE FOR CORRECTING THE THICKNESS PROFILE OF THE STRIP TO BE ROLLED ON A MULTIPLE-STANDARD HOT-ROLLING ROLL MILL |
WO1995019591A1 (en) * | 1994-01-13 | 1995-07-20 | Siemens Aktiengesellschaft | Method and device for running a process |
US6098060A (en) † | 1995-03-16 | 2000-08-01 | Siemens Aktiengesellschaft | Process controlling method and device |
DE19618712B4 (en) * | 1996-05-09 | 2005-07-07 | Siemens Ag | Control method for a roll stand for rolling a strip |
JPH10263657A (en) † | 1997-03-25 | 1998-10-06 | Kawasaki Steel Corp | Method for measuring roll profile and device therefor |
-
2000
- 2000-09-13 DE DE10045259A patent/DE10045259A1/en not_active Ceased
-
2001
- 2001-08-23 DE DE50110218T patent/DE50110218D1/en not_active Expired - Lifetime
- 2001-08-23 EP EP01120214A patent/EP1188493B2/en not_active Expired - Lifetime
- 2001-08-23 ES ES01120214T patent/ES2266062T5/en not_active Expired - Lifetime
- 2001-08-23 AT AT01120214T patent/ATE330724T1/en active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2691188B1 (en) | 2011-05-24 | 2015-06-17 | Siemens Aktiengesellschaft | Operating method for a rolling train |
US9586245B2 (en) | 2011-05-24 | 2017-03-07 | Primetals Technologies Germany Gmbh | Operating method for a rolling train |
Also Published As
Publication number | Publication date |
---|---|
DE50110218D1 (en) | 2006-08-03 |
EP1188493A2 (en) | 2002-03-20 |
DE10045259A1 (en) | 2002-03-21 |
ATE330724T1 (en) | 2006-07-15 |
ES2266062T3 (en) | 2007-03-01 |
EP1188493B2 (en) | 2009-05-20 |
EP1188493A3 (en) | 2004-04-07 |
ES2266062T5 (en) | 2009-11-06 |
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