EP1121990B1 - Device for rolling strips with a periodically variable thickness - Google Patents
Device for rolling strips with a periodically variable thickness Download PDFInfo
- Publication number
- EP1121990B1 EP1121990B1 EP01102289A EP01102289A EP1121990B1 EP 1121990 B1 EP1121990 B1 EP 1121990B1 EP 01102289 A EP01102289 A EP 01102289A EP 01102289 A EP01102289 A EP 01102289A EP 1121990 B1 EP1121990 B1 EP 1121990B1
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- Prior art keywords
- band
- pay
- reel
- thickness
- roll
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- 238000005096 rolling process Methods 0.000 title claims description 41
- 239000000463 material Substances 0.000 claims description 16
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 230000006872 improvement Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 230000004075 alteration Effects 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000008859 change Effects 0.000 description 8
- 239000002184 metal Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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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
- B21B37/16—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
-
- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/38—Control of flatness or profile during rolling of strip, sheets or plates using roll bending
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
- B21B37/52—Tension control; Compression control by drive motor control
- B21B37/54—Tension control; Compression control by drive motor control including coiler drive control, e.g. reversing mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/02—Feeding or supporting work; Braking or tensioning arrangements, e.g. threading arrangements
- B21B39/08—Braking or tensioning arrangements
Definitions
- the present invention relates to the rolling of strips, by means of a roll stand with a roller set to limit the roll gap and a Anstellsystem for determining the width of the roll gap.
- a roll stand In front of the rolling stand is an uncoiler and a take-up reel is arranged downstream of the rolling stand.
- the strip material to be reduced in thickness is unwound from the unwinding reel, passed through the nip between the rolls of the set of rolls, and again wound up in tension on the windup reel.
- the aim is the most uniform thickness of the strip-shaped rolling stock after leaving the nip, as of course also located on the unwinding reel in the form of a coil strip-shaped réellezgut should have the same thickness as possible over the entire length. So it should be in the known solutions, the strip-shaped rolling stock as constant as possible output thickness and a constant, smaller final thickness. If, for example, in bodywork, flat sheets in different areas have different thicknesses, metal strips of different thicknesses are welded together.
- metal strips have already been rolled, which have successive strip sections of different thicknesses in the longitudinal direction of the strip. Uniquely sections of different thicknesses follow one another, this can be done relatively easily by changing the width of the roll gap.
- control strategy is preferably used with such a rolling mill according to the invention.
- the rolling stand (main drive) is speed-controlled to the desired set speed. In stationary rolling operation, therefore, the rolls rotate at practically constant peripheral speed.
- the dancer rolls are force-controlled with the task of applying the desired strip tension.
- the reels are speed-controlled, wherein the target speed is adjusted taking into account the respective coil diameter to the average value of the belt speed.
- the dancers compensate for the variable flow of material at the entrance and exit of the mill stand.
- the strip pullers on the inlet and outlet sides of the rolling stand are practically (in close tolerances) constant.
- the tape thickness can be varied relatively arbitrarily, without risking tape breaks and damage to the system.
- FIG. 2 A rolling mill according to the invention with a respective compensating roll or dancer roll at the inlet and the outlet side of a roll stand is shown in FIG. 2 and described below. It is understood that this is only an embodiment of the invention.
- a rolling stand 1 In the center of the rolling mill, a rolling stand 1 is arranged, in which two work rolls 2, 3 determine the width of the roll gap through which the strip-shaped rolling material 4 is forcibly passed to the actual thickness of the rolling material 4 in front of the rolling stand 1 for smaller target thickness after the rolling stand. 1 to reduce.
- the structure of the roll stand 1 corresponds to the prior art, so that further illustration and description is omitted and only two support rollers or rollers 5, 6 and a device 7 are shown, with the device 7, the rollers perpendicular to the metal strip are adjustable to determine or change the width of the roll gap.
- the input thickness of the strip 4 in front of the roll stand 1 is assumed to be constant, as shown in the section 8 of the polyline in the diagram of FIG.
- this target thickness of the strip material is not intended to be constant but to be different, wherein the nominal thickness change is to be repeated periodically, specifically at a relatively high strip speed (part figure 1a).
- reel 10 and roll stand 1 on the one hand and reel 11 and roll stand 1 on the other hand depending on a balance or dancer roll 12 and 13 respectively.
- the rolling mill 1 is speed-controlled and adjusted to the desired target speed
- the dancer rollers 12, 13 are force-controlled to apply the desired strip tension
- the reels 10 and 11 are speed controlled
- the target speed taking into account the respective coil diameter is set to the mean value of the belt speed, ie that as much band 4 is unwound from the uncoiler 10, as the rolling stand 1 moves in and that as much band 4 is wound up from the reel 11, as the rolling stand 1 delivers on the outlet side.
- the dancer rollers 12, 13 are adjustable up and down, as expressed by the double arrows 14, 15.
- the problem may arise that the rolling force varies periodically or cyclically according to the periodically or cyclically variable changes in thickness of the strip material. This can lead to that Form in the strip material in the central region in the tape longitudinal direction successive waves when the reduction in thickness of the rolled strip is relatively low, and that form such waves in the edge regions of the rolled strip, when the thickness decrease of the rolled strip is relatively large.
- the sections can be "thin".
- Fig. 3 the problem is clarified.
- the rolling stand 1 is followed by a thickness measurement on the rolled strip 4 in the thick region n + 1, at a distance of 18 from the rolling mill, while in the direction of Walzbandvorschubes previous thick band area n at a distance 19 from the rolling stand 12 by means of a flatness measuring system 16, the flatness of the rolled strip is determined. While a possible deviation of the flatness actual value from the nominal value in the region n is determined, the next following thick region n + 1 has already left the roll stand 1, consideration for the region n + 1 is no longer possible, but only for later thick strip sections from n + 2, for which a new setting has been made.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
- Metal Rolling (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
Abstract
Description
Die vorliegende Erfindung bezieht sich auf das Walzen von Bändern, mittels eines Walzgerüstes mit einem Walzensatz zur Begrenzung des Walzspaltes und einem Anstellsystem zur Bestimmung der Weite des Walzspaltes. Vor dem Walzgerüst befindet sich eine Abwickelhaspel und eine Aufwickelhaspel ist dem Walzgerüst nachgeordnet. Das in seiner Dicke zu reduzierende Bandmaterial wird von der Abwickelhaspel unter Zug abgewickelt, durch den Walzspalt zwischen den Walzen des Walzensatzes hindurchgeführt und wiederum unter Zug auf die Aufwickelhaspel aufgewickelt. Angestrebt wird dabei eine möglichst gleichmäßige Dicke des bandförmigen Walzgutes nach dem Verlassen des Walzspaltes, wie selbstverständlich auch das auf der Abwickelhaspel in der Form eines Coils befindliche bandförmige Ausgangswalzgut eine möglichst gleiche Dicke über die gesamte Länge haben soll. Es soll also bei den bekannten Lösungen das bandförmige Walzgut eine möglichst konstante Ausgangsdicke und eine möglichst konstante, geringere Enddicke haben. Sollen, beispielsweise im Karosseriebau, flächige Bleche in verschiedenen Bereichen unterschiedliche Dicken haben, so werden Blechbänder unterschiedlicher Dicken miteinander verschweißt.The present invention relates to the rolling of strips, by means of a roll stand with a roller set to limit the roll gap and a Anstellsystem for determining the width of the roll gap. In front of the rolling stand is an uncoiler and a take-up reel is arranged downstream of the rolling stand. The strip material to be reduced in thickness is unwound from the unwinding reel, passed through the nip between the rolls of the set of rolls, and again wound up in tension on the windup reel. The aim is the most uniform thickness of the strip-shaped rolling stock after leaving the nip, as of course also located on the unwinding reel in the form of a coil strip-shaped Ausgangsswalzgut should have the same thickness as possible over the entire length. So it should be in the known solutions, the strip-shaped rolling stock as constant as possible output thickness and a constant, smaller final thickness. If, for example, in bodywork, flat sheets in different areas have different thicknesses, metal strips of different thicknesses are welded together.
Im Laborbetrieb wurden auch schon Blechbänder gewalzt, die in Längsrichtung des Bandes aufeinanderfolgenden Bandabschnitten unterschiedlicher Dicken haben. Folgen einmalig Abschnitte unterschiedlicher Dicken aufeinander, so kann das relativ problemlos durch Veränderung der Weite des Walzspaltes erfolgen.In laboratory operation, metal strips have already been rolled, which have successive strip sections of different thicknesses in the longitudinal direction of the strip. Uniquely sections of different thicknesses follow one another, this can be done relatively easily by changing the width of the roll gap.
Aus Schwarz N. et al., "Flexibel gewalzte Bleche für belastungsangepaßte Werkstücke", Werkstatt und Betrieb, Bd. 131, Nr. 5, Mai 1998, Seiten 424 - 427 ist ein gattungsgemäßer Prototyp einer Vorrichtung zum Walzen von Bändern mit periodisch veränderlicher Banddicke, also zum flexiblen Walzen, bekannt. Die Walzvorrichtung enthält ein Walzgerüst mit einem Walzensatz und einem Anstellsystem zur Bestimmung des Walzenspaltes, dem das Bandmaterial mit einer Ausgangsdicke eingangsseitig von einer Abhaspel aus zugeführt wird und von dem aus das Bandmaterial mit der jeweils gewollten Enddicke ausgangsseitig einer Aufhaspel zugeführt wird. Über den Laborbetrieb, der im Wesentlichen der Herstellung und anschließenden Untersuchung von flexibel gewalzten Blechen diente, ist diese vorbekannte Vorrichtung offensichtlich bislang nicht hinausgekommen.Schwarz N. et al., "Flexible Rolled Sheets for Load Adjusted Workpieces", Werkstatt und Betrieb, Vol. 131, No. 5, May 1998, pages 424-427 is a generic prototype apparatus for rolling tapes of periodically varying tape thickness , so for flexible rolling, known. The rolling apparatus includes a rolling stand with a set of rollers and a Anstellsystem for determining the nip to which the strip material is fed with an output thickness on the input side of a spool and from which the strip material is supplied with the respective desired final thickness on the output side of a coiler. About the laboratory operation, which was essentially the production and subsequent investigation of flexible rolled sheets, this prior art device has obviously not come out yet.
sollen periodisch Streifenabschnitte unterschiedlicher Dicken aufeinanderfolgen, so kann nur bei einer relativ geringen Bandlaufgechwindigkeit ein sauberer Übergang zwischen den einzelnen unterschiedlich dicken Bandabschnitten gewährleistet werden. Die mögliche Bandlaufgeschwindigkeit ist zu gering, um den Laborbetrieb in den Bereich industrieller Massenfertigung zu übernehmen. Die Probleme bei der Fertigung von Bändern mit periodisch aufeinanderfolgenden Bandabschnitten unterschiedlicher Banddicken sind in der Tatsache begründet, nämlich dass bei Veränderung des Abwalzgrades sich die Bandgeschwindigkeiten am Eingang und am Ausgang des Walzspaltes verändern und Voreilung und Rückstau des Bandes relativ zur Umfangsgechwindigkeit der Arbeitswalzen mit der Stichveränderung verändern. Darum müssen die Haspelantriebe in ihrer Gechwindigkeit ständig an die veränderlichen Prozessbedingungen angepasst werden. Hierzu sind Geschwindigkeitsänderungen bis zu 50% der Nenngeschwindigkeit in kurzer Zeit (z.B. 0,15 Sek.) erforderlich. Dies führt bei den bisher bekannten Kaltwalzwerken zu heftigen Schwankungen der-Bandzüge. Daraus folgen ein unregelmäßiger Aufbau des aufzuwickelnden Coils, unzulässige Abweichungen der Endwalz-Dicke von ihrem Sollwert, Risiko von Bandrissen und Beschädigung von Anlagenteilen.If strip sections of different thicknesses are to follow each other periodically, a clean transition between the individual strip sections of different thickness can only be guaranteed at a relatively low strip speed. The potential tape speed is too low to take the laboratory operation in the field of industrial mass production. The problems in the production of tapes with periodically successive tape sections of different tape thicknesses are due to the fact that as the degree of rolling changes, the tape speeds at the entrance and exit of the nip change and lead and backlog of the tape relative to the peripheral speed of the work rolls with the stitch change change. Therefore, the reel drives in their speed must be constantly adapted to the changing process conditions. This requires speed changes up to 50% of the rated speed in a short time (e.g., 0.15 sec.). This leads to hitherto known cold rolling mills to violent fluctuations of the band hoops. This results in an irregular structure of the wound coil, impermissible deviations of the final rolling thickness from its nominal value, risk of band breaks and damage to system components.
Mit großen Arbeitsgeschwindigkeiten sind die bisher vorgeschlagenen Verfahren nicht durchführbar. Senkt man die Geschwindigkeit der Anlage so weit ab, dass der Prozess beherrschbar ist, so wird die Produktionsleistung so gering, dass der anlagetechnische Aufwand nicht gerechtfertigt wird. Mit den bisher gegebenen Möglichkeiten können Bänder mit periodisch aufeinanderfolgenden Bandabschnitten unterschiedlicher Dicke wirtschaftlich nicht gefertigt werden.With high operating speeds, the previously proposed methods are not feasible. If the speed of the system is reduced so much that the process is manageable, the production output becomes so low that the plant's outlay is not justified. With the possibilities given so far, bands with periodically successive strip sections of different thickness can not be manufactured economically.
Aus dem Abstract der JP-A-10 034204 ist eine Spannungssteuerung für ein reversierbares Walzwerk bekannt. Diese Steuerung befasst sich damit, den Zug eines Streifens beim Starten und während des Normalbetriebs des Walzwerks stabil zu halten. Dazu werden Tänzerrollen zwischen der Abhaspel und dem Walzgerüst sowie zwischen dem Walzgerüst und der Aufhaspel angeordnet und positionsgesteuert.From the abstract of JP-A-10 034204 a tension control for a reversible rolling mill is known. This control is concerned with keeping the tension of a strip stable during starting and during normal operation of the rolling mill. For this purpose, dancer rollers between the uncoiler and the rolling stand and between the rolling stand and the coiler are arranged and position-controlled.
Vor diesem technischen und wirtschaftlichen Hintergrund ist es nun das Ziel der vorliegenden Erfindung, eine Möglichkeit aufzuzeigen, auf wirtschaftlich akzeptable Weise zu Coils aufgewickelte Metall-Bänder unter Zug abzuwickeln, in der Dicke zu reduzieren und anschließend unter Zug wieder aufzuwickeln, wobei eine relativ konstante Banddicke (= Ist-Dicke) auf der Einlaufseite unterstellt werden soll und eine periodisch veränderliche Banddicke (=Soll-Dicke) auf der Auslaufseite erreichbar sein woll, wie es in Fig. 1 diagrammartig dargestellt ist.Against this technical and economic background, it is now the object of the present invention to provide a way to unwind in coils, economically wound to coils wound metal bands, reduce in thickness and then rewind under train, with a relatively constant strip thickness (= Actual thickness) should be assumed on the inlet side and a periodically variable strip thickness (= target thickness) on the outlet side should be achievable, as shown diagrammatically in Fig. 1.
Dieses Ziel wird mit einer Vorrichtung nach dem Anspruch 1 erreicht. Weitere bevorzugte Ausgestaltungen sind in den abhängigen Ansprüchen angegeben.This object is achieved with a device according to
Die Erfindung wird anhand der Zeichnung erläutert, in der zeigen
- Fig. 1
- ein Diagramm zur Erläuterung von in Bandlängsrichtung aufeinanderfolgenden Bandabschnitten verschiedener Dicke,
- Fig. 1a
- einen größeren Bandlängsschnitt in kleinerer Darstellung,
- Fig. 2
- in diagrammartiger Darstellung eine erfindungsgemäße Anlage bezw. Vorrichtung,
- Fig. 3
- eine Darstellung zur Erläuterung des Problems, das mit der Erfindung in einer weiteren Ausgestaltung gelöst wird, und
- Fig. 4
- eine weitere Erläuterung zu der weiteren Ausgestaltung der Erfindung.
- Fig. 1
- a diagram for explaining band longitudinally successive band sections of different thickness,
- Fig. 1a
- a larger band longitudinal section in a smaller representation,
- Fig. 2
- in diagrammatic representation, a plant according to the invention BEZW. Contraption,
- Fig. 3
- a representation for explaining the problem, which is achieved with the invention in a further embodiment, and
- Fig. 4
- a further explanation of the further embodiment of the invention.
Mit einem solchen erfindungsgemäßen Walzwerk wird bevorzugt folgende Regelstrategie angewendet.The following control strategy is preferably used with such a rolling mill according to the invention.
Das Walzgerüst (Hauptantrieb) wird drehzahlgeregelt auf die gewünschte Soll-Geschwindigkeit eingestellt. Beim stationären Walzbetrieb drehen sich die Walzen also mit praktisch konstanter Umfangsgeschwindigkeit.The rolling stand (main drive) is speed-controlled to the desired set speed. In stationary rolling operation, therefore, the rolls rotate at practically constant peripheral speed.
Die Tänzerrollen werden kraftgeregelt mit der Aufgabe, den gewünschten Bandzug aufzubringen.The dancer rolls are force-controlled with the task of applying the desired strip tension.
Die Haspeln werden drehzahlgeregelt, wobei die Soll-Drehzahl unter Berücksichtigung des jeweiligen Coil-Durchmessers auf den Mittelwert der Bandgeschwindigkeit eingestellt wird.The reels are speed-controlled, wherein the target speed is adjusted taking into account the respective coil diameter to the average value of the belt speed.
Das heißt, dass die Abhaspel soviel Band abspult, wie das Walzgerüst im Mittelwert einzieht und dass die Aufhaspel soviel Band aufwickelt,wie das Walzgerüst an seiner Auslaufseite abgibt.This means that the uncoiler unwinds as much belt as the rolling mill moves in on average and that the coiler winds up as much ribbon as the rolling mill delivers at its outlet side.
Hierbei werden die Positionen der Tänzerrollen überwacht und daraus werden Stellsignale zur Korrektur der Haspelgeschwindigkeiten abgeleitet, beispielsweise wie folgt:
- sinkt die einlaufseitige Tänzerrolle zu tief unter den unteren Schaltpunkt ab, wird die Abhaspel entsprechend verzögert.
- Steigt diese Tänzerrolle zu weit über den oberen Schaltpunkt auf, wird die Abhaspel beschleunigt.
- Bei zu weit absinkender auslaufseitiger Tänzerrolle muß die Aufhaspel etwas schneller fahren und umgekehrt.
- If the inlet side dancer roll falls too low below the lower switching point, the uncoiler will be decelerated accordingly.
- If this dancer roll rises too far above the upper switching point, the uncoiler is accelerated.
- If the dancer roller is sinking too far, the reel must move a bit faster and vice versa.
Im Ergebnis gleichen bei der Erfindung die Tänzerrollen den variablen Materialfluss an Eingang und Ausgang des Walzgerüstes aus.As a result, in the invention, the dancers compensate for the variable flow of material at the entrance and exit of the mill stand.
Sowohl die Abhaspel als auch die Aufhaspel fahren mit praktisch konstanter Wickelgeschwindigkeit unabhängig vom aktuellen Coil-Durchmesser.Both the uncoiler and the coiler travel at virtually constant winding speed regardless of the current coil diameter.
Die Bandzüge an Ein- und Auslaufseite des Walzgerüstes sind praktisch (in engen Toleranzen) konstant.The strip pullers on the inlet and outlet sides of the rolling stand are practically (in close tolerances) constant.
Damit sind die Voraussetzungen für ein gut gewickeltes Coil auf der Auslaufseite gegeben.Thus, the conditions for a well-wound coil on the outlet side are given.
Außerdem kann die Banddicke relativ willkürlich variiert werden, ohne Bandrisse und Beschädigungen der Anlage zu riskieren.In addition, the tape thickness can be varied relatively arbitrarily, without risking tape breaks and damage to the system.
Als weitere Ausgestaltung der Erfindung wird vorgeschlagen, dass bei periodischer Veränderung der Soll-Dicke auf der Auslaufseite die Zuordnung der Bewegung der Tänzerrollen zur Veränderung der Banddicke (bekannte Soll-Funktion) zu beobachten.As a further embodiment of the invention, it is proposed to observe the assignment of the movement of the dancer rolls to change the strip thickness (known desired function) in the event of a periodic change in the nominal thickness on the outlet side.
Daraus kann man eine aus anderen Regelungsaufgaben bekannte Störgrößenaufschaltung (Vorsteuerung) ableiten. Wenn man zum Beispiel gelernt hat, wann eine Tänzerrolle mit einer bestimmten Beschleunigung bewegt werden muß, kann man die entsprechenden Beschleunigungs-Zusatzkräfte auf den Sollwert der Zugkraft der Tänzerrolle aufschalten. Damit ist eine weitere Verbesserung der Konstanz der Bandzüge möglich. Dies wirkt sich günstig auf die Stabilität des Prozesses und insbesondere auf die Qualität des Walzgutes aus (z.B. Dickentoleranzen und Oberflächenqualität).From this one can derive a known from other control tasks Störgrößenaufschaltung (feedforward). For example, if you have learned when to move a dancer roll at a given acceleration, you can apply the appropriate amount of additional acceleration to the dancer roll tension set point. Thus, a further improvement in the constancy of the band is possible. This has a favorable effect on the stability of the process and in particular on the quality of the rolling stock (for example thickness tolerances and surface quality).
Eine Walzanlage mit erfindungsgemäß je einer Ausgleichsrolle bzw. Tänzerrolle an der Einlauf- und der Auslaufseite eines Walzgerüstes ist in Fig. 2 dargestellt und nachfolgend beschrieben. Es versteht sich, dass es sich dabei nur um ein Ausführungsbeispiel der Erfindung handelt.A rolling mill according to the invention with a respective compensating roll or dancer roll at the inlet and the outlet side of a roll stand is shown in FIG. 2 and described below. It is understood that this is only an embodiment of the invention.
Im Zentrum der Walzanlage ist ein Walzgerüst 1 angeordnet, in dem zwei Arbeitswalzen 2, 3 die Weite des Walzspaltes bestimmen, durch den das bandförmige Walzmaterial 4 zwangsweise hindurchgeführt wird, um die Istdicke des Walzmaterials 4 vor dem Walzgerüst 1 zur geringeren Solldicke nach dem Walzgerüst 1 zu reduzieren. Im übrigen entspricht der Aufbau des Walzgerüstes 1 dem Stand der Technik, sodass auf weitere Darstellung und Beschreibung verzichtet wird und nur noch zwei Stützwalzen bzw. -rollen 5, 6 sowie eine Einrichtung 7 dargestellt sind, wobei mit der Einrichtung 7 die Walzen senkrecht zum Metallband verstellbar sind, um die Weite des Walzspaltes bestimmen bzw. verändern zu können. Die Eingangsdicke des Bandes 4 vor dem Walzgerüst 1 wird als konstant unterstellt, wie es der Abschnitt 8 des Linienzuges im Diagramm gemäß Fig. 1 zeigt, in dem die Dicke des Metallbandes über dessen Länge dargestellt ist. Die Dicken- und Längenangaben sind in besonderem Maße beispielhaft. Nach dem Walzgerüst 1 soll die Dicke des Bandmaterials auf einen Soll-Wert verringert sein, wie es durch den Abschnitt 9 des Linienzuges im Diagramm gemäß Fig. 1 dargestellt ist. Diese Soll-Dicke des Bandmaterials soll nun abweichend vom industriellen Stand der Technik nicht konstant, sondern unterschiedlich sein, wobei die Solldickenveränderung periodisch sich wiederholen soll und zwar bei relativ hoher Bandlaufgeschwindigkeit (Teilfigur 1a).In the center of the rolling mill, a rolling
Hierzu ist zwischen Abhaspel 10 und Walzgerüst 1 einerseits und Aufhaspel 11 und Walzgerüst 1 andererseits je eine Ausgleichs- bzw. Tänzerrolle 12 bzw. 13 angeordnet.For this purpose, between
Wie bereits oben ausgeführt, wird das Walzgerüst 1 drehzahlgeregelt und auf die gewünschte Sollgeschwindigkeit eingestellt, werden die Tänzerrollen 12, 13 kraftgeregelt, um den gewünschten Bandzug aufzubringen, und werden die Haspeln 10 und 11 drehzahlgeregelt, wobei die Solldrehzahl unter Berücksichtigung des jeweiligen Coil-Durchmessers auf den Mittelwert der Bandgeschwindigkeit eingestellt wird, d.h. dass von der Abhaspel 10 soviel Band 4 abgespult wird, wie das Walzgerüst 1 einzieht und dass von der Aufhaspel 11 soviel Band 4 aufgewickelt wird, wie das Walzgerüst 1 auf der Auslaufseite abgibt. Die Tänzerrollen 12, 13 sind nach oben und unten verstellbar, wie es durch die Doppelpfeile 14, 15 ausgedrückt ist. Zu den Funktionen im einzelnen wird auf das oben Gesagte verwiesen.As stated above, the rolling
Insbesondere bei der oben beschriebenen Vorrichtung gemäß der Erfindung und deren Arbeitsweise kann das Problem auftreten, dass die Walzkraft entsprechend den periodisch bzw. zyklisch veränderlichen Dickenveränderungen des Bandmaterials periodisch bzw. zyklisch schwankt. Dies kann dazu führen, dass sich im Bandmaterial in dessen mittlerem Bereich in der Bandlängsrichtung aufeinanderfolgende Wellen ausbilden, wenn die Dickenabnahme des Walzbandes relativ gering ist, und dass sich solche Wellen in den Randbereichen des Walzbandes ausbilden, wenn die Dickenabnahme des Walzbandes relativ groß ist. Das Problem dieser Rand- bzw. Mittelwellenausbildung ist beherrschbar, wenn periodische Dickenveränderungen in relativ großen Abständen erfolgen und die Anpassungen an die Notwendigkeit der Randwellenunterdrückung bzw. -beseitigung und der Mittelwellenunterdrückung bzw. -beseitigung nur in großen Abständen besteht, sei es, weil die räumlichen, sei es weil die zeitlichen Abstände zwischen zwei aufeinanderfolgenden Dickenveränderungen entsprechend groß sind, oder, anders ausgedrückt, Planheitsregelungssysteme nur auf relativ langwellige Prozessveränderungen reagieren müssen. Die vorliegende Erfindung zeigt in ihrer weiteren Ausbildung auf, wie das geschilderte Problem dann gelöst werden kann, wenn der Abstand zwischen je zwei von periodisch wiederkehrenden Dickenänderungen kurz und insbesondere kürzer als der Abstand zwischen dem Walzgerüst und einem Planheitsmesssystem ist. Erfindungsgemäß wird im Zusammenhang damit vorgeschlagen, Mittel für einen Vergleich zwischen Banddickenistwert und vorgegebenem Banddickensollwert in der Form einer Bandverfolgungseinrichtung zu installieren und gemäß Fig. 3, 4 in der Weise zu nutzen, dass die tatsächliche Planheit des Bandes in einem Abschnitt "dick" gemessen und mit einem vorgegebenen Sollwert verglichen wird. Ergibt sich eine Abweichung des ermittelten tatsächlichen Istwertes vom Sollwert, so wird eine Veränderung der für die Planheit ursächlichen Faktoren, insbesondere also der Durchbiegung der Arbeitswalzen, bewirkt so, dass bereits der nächstfolgende Abschnitt "dick" in verbesserter Planheit gewalzt wird.In particular, in the above-described device according to the invention and its operation, the problem may arise that the rolling force varies periodically or cyclically according to the periodically or cyclically variable changes in thickness of the strip material. This can lead to that Form in the strip material in the central region in the tape longitudinal direction successive waves when the reduction in thickness of the rolled strip is relatively low, and that form such waves in the edge regions of the rolled strip, when the thickness decrease of the rolled strip is relatively large. The problem of this edge or Mittelwellen training is manageable when periodic changes in thickness are made at relatively large intervals and the adjustments to the need for the edge wave suppression and the Mittelwellenunterdrückung or elimination only at long intervals, either because the spatial whether it is because the time intervals between two successive changes in thickness are correspondingly large, or, in other words, flatness control systems only have to react to relatively long-wave process changes. The present invention shows in its further development how the described problem can be solved if the distance between any two of periodically recurring changes in thickness is short and in particular shorter than the distance between the rolling stand and a flatness measuring system. According to the invention, it is proposed in this connection to install means for a comparison between the actual tape thickness and the predetermined tape thickness setpoint in the form of a tape tracker and to use it according to FIGS. 3, 4 in such a way that the actual flatness of the tape is measured in a section "thick" and is compared with a predetermined setpoint. If a deviation of the determined actual actual value from the nominal value results, a change in the factors causing the flatness, in particular the deflection of the work rolls, is effected so that the next following section "thick" is already rolled in improved flatness.
Entsprechend kann für die Abschnitte "dünn" verfahren werden.Accordingly, the sections can be "thin".
In Fig. 3 ist das Problem verdeutlicht. Dem Walzgerüst 1 folgt eine Dickenmessung am Walzband 4 im dicken Bereich n + 1, im Abstand 18 vom Walzgerüst, während im in der Richtung des Walzbandvorschubes vorhergehenden dicken Bandbereich n im Abstand 19 vom Walzgerüst 12 mittels eines Planheitsmesssystems 16 die Planheit des Walzbandes ermittelt wird. Während eine etwaige Abweichung des Planheitsistwertes vom Sollwert im Bereich n festgestellt wird, hat der nächstfolgende dicke Bereich n + 1 bereits das Walzgerüst 1 verlassen, eine Berücksichtigung für den Bereich n + 1 ist nicht mehr möglich, sondern erst für spätere dicke Bandabschnitte ab n + 2, für die eine Neueinstellung erfolgt ist. Dieser Zustand soll beseitigt werden und Korrekturen zum Erhalt optimaler Planheit bereits für das Walzen des Abschnittes n + 1 berücksichgt werden können. Dies geschieht mit einem symbolisch dargestellten Bandverfolgungssystem 17 das insbesondere ein Schieberegister ist, wie es an sich von der Massenfluss-Regelung bekannt ist. Es stellt sich der Erfolg gemäß Fig. 4 ein, indem im Bereich "dick" das Messen der Planheit im Bereich "dick" und im Bereich "dünn" das Messen der Planheit im Bereich "dünn" erfolgt.In Fig. 3 the problem is clarified. The rolling
Das Ermitteln der Abweichung des Istwertes vom Sollwert und das Berechnen eines neuen Sollwertes erfolgen bereits für den nächsten noch zu walzenden Bandabschnitt.The determination of the deviation of the actual value from the desired value and the calculation of a new desired value already take place for the next band section to be rolled.
Claims (8)
- Device for rolling of bands (4) having periodically alterable band thickness wherein said rolling device has a roll stand (1) with a set of rolls and an adjustment system for determination of the roll gap to which the band material (4) having an initial thickness on the inlet side is fed from a pay off reel decoiler (10), and from which said band material (4) having a respectively desired final thickness on the outlet side is fed to a pay on reel coiler (11),
characterized
in that both between said pay off reel decoiler (10) and said roll stand (1) and between said roll stand (1) and said pay on reel coiler (11) there is arranged a balancing or dancer roll (12, 13) around which the band material (4) is led in a loop like manner and which are force controlled at constant circumferential speed of the rolls (2, 3) of the roll stand (1) determining the roll gap so as to apply a desired band tension. - Device according to claim 1,
characterized
in that said reeling plants (10, 11) are rotational speed controlled. - Device according to claims 1 and 2,
characterized
in that the nominal rotational speed of said reeling plants (10, 11) is set to the average value of the band speed in consideration of the respective coil diameter, and such an amount of band is uncoiled from said pay off reel decoiler (10) as band is torn on average into the roll gap and such an amount of band is coiled onto said pay on reel coiler (11) as band leaves said roll gap. - Device according to claims 1 to 3,
characterized
in that local displacements of the dancer rolls (12, 13) due to balance interferences between band outlet from said pay off reel decoiler (10) and the band inlet into said roll gap and/or between band discharge from said roll gap and and band coiling onto said pay on reel coiler (11) are determined and converted into control signals for the rotational speeds of pay off reel decoiler and pay on reel coiler. - Device according to any of the claims 1 to 4,
characterized
in a means for watching the material flow and for supply of command signals for the determination of the band thickness that alters in periodic order. - Device according to claim 5,
characterized
in that said means for watching the material flow is an inherently known shift register. - Device according to claim 5 or 6,
characterized
in means for improvement of the constancy of the band tension by determination of the periodicity of the band thickness alteration and the switching on of a disturbance variable for the compensation of the acceleration forces that act on the balancing or dancer rolls (12, 13). - Device according to any of the claims 5 to 7,
characterized
in a cyclical, sensing flatness control which on the basis of a measurement system for material watching compares the band flatness actual value measured in the region of the band discharge from the roll gap, with a predetermined band flatness nominal value, and forms correction commands for the roll deflection and if applicable other components affecting the band flatness, respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10004532 | 2000-02-02 | ||
| DE10004532A DE10004532A1 (en) | 2000-02-02 | 2000-02-02 | Device for rolling strips with a periodically variable strip thickness |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| EP1121990A2 EP1121990A2 (en) | 2001-08-08 |
| EP1121990A3 EP1121990A3 (en) | 2004-01-14 |
| EP1121990B1 true EP1121990B1 (en) | 2006-05-24 |
| EP1121990B2 EP1121990B2 (en) | 2012-02-29 |
Family
ID=7629574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01102289A Expired - Lifetime EP1121990B2 (en) | 2000-02-02 | 2001-02-01 | Device for rolling strips with a periodically variable thickness |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1121990B2 (en) |
| AT (1) | ATE327058T1 (en) |
| DE (2) | DE10004532A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10310399B4 (en) * | 2003-03-07 | 2005-03-03 | Sundwig Gmbh | Apparatus and method for rolling metal strips |
| DE10315357B4 (en) * | 2003-04-03 | 2005-05-25 | Muhr Und Bender Kg | Process for rolling and rolling plant for rolling metal strip |
| DE102005031461A1 (en) * | 2005-07-04 | 2007-01-11 | Bilstein Gmbh & Co. Kg | Method for producing micro alloyed cold rolled strip with varying thickness by two rolling and tempering processes |
| DE102006011939A1 (en) * | 2006-03-15 | 2007-09-27 | Siemens Ag | Rolling process for a rolling stock for introducing a step into the rolling stock |
| DE102006047463A1 (en) * | 2006-10-07 | 2008-04-17 | ACHENBACH BUSCHHüTTEN GMBH | Rolling mill and method for flexible cold or hot one-way or reverse rolling of metal strip |
| DE102008035738B4 (en) | 2007-07-31 | 2020-06-18 | Danieli Germany GmbH | Rolling device |
| CN105772512B (en) * | 2014-12-23 | 2018-04-27 | 宝山钢铁股份有限公司 | Tension stability method during Varying Thickness Plates coil rolling |
| ES2769264T3 (en) * | 2016-02-23 | 2020-06-25 | Bilstein Gmbh & Co Kg | Device and method for laminating a strip of material with variable thickness |
| CN106670242B (en) * | 2017-02-09 | 2018-05-04 | 广西南南铝加工有限公司 | The device of the offline Strip Shape of On-line Control |
| PL3610961T3 (en) | 2018-08-15 | 2023-09-11 | Muhr Und Bender Kg | Device, rolling mill and method for regulating strip tension during the flexible rolling of metal strips |
| DE102019215265A1 (en) * | 2018-12-06 | 2020-06-10 | Sms Group Gmbh | Method for operating a roll stand for step rolling |
| CN114074121B (en) * | 2021-11-18 | 2023-05-26 | 东北大学 | Speed compensation method for constant-speed rolling of variable-thickness plate and strip |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE556915A (en) * | 1956-04-23 | |||
| JPH1034204A (en) * | 1996-07-29 | 1998-02-10 | Kawasaki Steel Corp | Tension controller for reversible rolling mill |
| DE19818207C2 (en) * | 1998-04-23 | 2000-05-31 | Schloemann Siemag Ag | Steckel hot rolling mill |
-
2000
- 2000-02-02 DE DE10004532A patent/DE10004532A1/en not_active Withdrawn
-
2001
- 2001-02-01 AT AT01102289T patent/ATE327058T1/en not_active IP Right Cessation
- 2001-02-01 DE DE50109838T patent/DE50109838D1/en not_active Expired - Lifetime
- 2001-02-01 EP EP01102289A patent/EP1121990B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP1121990A2 (en) | 2001-08-08 |
| EP1121990B2 (en) | 2012-02-29 |
| EP1121990A3 (en) | 2004-01-14 |
| ATE327058T1 (en) | 2006-06-15 |
| DE50109838D1 (en) | 2006-06-29 |
| DE10004532A1 (en) | 2001-08-30 |
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