EP3138639A1 - Method for manufacturing a metallic belt by means of endless rolling - Google Patents
Method for manufacturing a metallic belt by means of endless rolling Download PDFInfo
- Publication number
- EP3138639A1 EP3138639A1 EP16186621.5A EP16186621A EP3138639A1 EP 3138639 A1 EP3138639 A1 EP 3138639A1 EP 16186621 A EP16186621 A EP 16186621A EP 3138639 A1 EP3138639 A1 EP 3138639A1
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- EP
- European Patent Office
- Prior art keywords
- flatness
- strip
- rolling
- tension
- measuring
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- 238000005096 rolling process Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 238000005259 measurement Methods 0.000 claims abstract description 35
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims description 5
- 238000013000 roll bending Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims description 2
- 238000004804 winding Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000001105 regulatory effect Effects 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
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- 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
- B21B38/02—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/04—Flatness
Definitions
- the invention relates to a method for producing a metallic strip by endless rolling, in which cast first in a casting the tape and this is then rolled continuously in a rolling mill with at least one rolling mill to the finished tape, wherein in the conveying direction of the belt behind the last stand a conveyor line is present for the strip, which extends to a scraper driver and / or a reel driver, or wherein there is a conveyor line between two stands of the rolling train, wherein behind the scraper driver and / or the reel driver a reel for winding the finished tape is arranged, at least temporarily in the conveyor line a nominal tension in the band is maintained.
- a flatness measurement and control for hot strip behind a hot strip mill is known.
- batch-rolling rolling of individual bands in a row
- the unevenness is optically detected on the draft-free tape head area and usually eliminated with the aid of the dynamic profile actuator of a work roll bend.
- the work roll deflection is reduced and increased at edge waves.
- An optical planarity meter typically used here discloses the DE 197 09 992 C1 ,
- continuous rolling - a casting plant and a rolling mill are connected.
- individual coils are produced by cutting the endless belt with scissors until shortly before the reel.
- An endless casting rolling process can take several hours. Since the strip is under tension between the rolling train and the reel, an optical flatness meter usually does not show a usable result.
- flatness is measured according to a known method with a flatness measuring roll by measuring the tensile stress distribution with a measuring roll and thus indirectly determining the flatness.
- a flatness measuring roller for the application of endless rolling discloses, for example, the DE 37 21 746 A1 .
- Other solutions are in the DE 198 43 899 C1 , in the EP 2 258 492 A1 , in the JP 6319 8809 A and in the US Pat. No. 7,963,136 B2 described.
- the flatness measuring roll is a costly and maintenance-intensive measuring device. If a system is operated in batch and endless mode, an optical flatness meter is often required in addition.
- the invention is therefore the object of further developing a generic method so that with little effort a cost flatness measurement and subsequent flatness control can also be done during continuous rolling.
- the measuring cycle can be repeated periodically. It is preferably provided that the measuring cycle during the execution of the method is repeated every 2 min to 10 min, preferably every 4 min to 6 min.
- the measuring cycle can also be carried out before a change in the rolling thickness of the strip.
- the measuring cycle can be carried out after a change in the rolling thickness of the strip.
- the measuring cycle takes place during the execution of a shear cut in the region of the reel.
- the measuring cycle is triggered by the operating personnel of the production facility for the production of the strip due to the nature of the occasion.
- the implementation of the above steps a) to c) is preferably carried out for a period of between 1 second and 20 seconds.
- the measurement period is minimized taking into account process conditions and plant limits.
- the nominal tensile stress in the band is, depending on the material strength of the band, preferably held between 10 N / mm 2 and 50 N / mm 2 ; However, it is preferably provided that the reduced tension value between 0 N / mm 2 and 15 N / mm 2 (especially: 0 N / mm 2 to 9 N / mm 2 ), more preferably between 0 N / mm 2 and 5 N / mm 2 .
- the nominal tension in the belt is reduced by 40% to 100% during the measurement cycle.
- the strip tension in the conveying path with the flatness measurement remain during the flatness measuring cycle in the adjacent areas - ie within the rolling train and / or between scissors or reel driver and / or reel - preferably unchanged.
- the flatness improvement of parabolic or symmetrical flatness components is carried out by using the work roll bending on at least one rolling stand and / or by using a swivel control and improving the asymmetrical flatness components by changing the setting positions on at least one rolling stand.
- a process and / or control model and / or control can be used to trigger the measurement cycle to set the gauge length, the nominal and reduced tape tensile stresses during the measurement cycle, depending on the hot strip thickness and / or the strip material and / or the final roll temperature to monitor the process and to observe the process limits.
- the predetermined process limits maximum permissible flatness limit (edge waves, center waves, maximum detected waves) and / or maximum permissible midband deviation and / or maximum midband deviation change detected by a measuring device are taken into account and from this a band tension level change, in particular a Bandzugerhöhung, during the flatness measuring cycle is caused.
- the (highly dynamic) profile actuator can be brought as close as possible to the center of its control range, in particular by detachment of the effect by means of CVC displacement or change of the thermal crown.
- an optical flatness measurement in the conveying path defined above is an advantageous and inexpensive possibility for accurate and simple detection of the flatness state of the strip.
- the strip tension between the hot rolling line and the reel driver or scraper driver is advantageously lowered in a metered manner for a specific measuring time.
- the hot rolling mill may be an at least single-standing rolling mill or a multi-stand rolling mill, as described, for example, in US Pat EP 0 889 762 B1 is disclosed.
- the strip is under tension between the last active stand and the reel driver to ensure stable rolling.
- After a certain rolling time it is now provided according to the invention to reduce the strip tension for a predeterminable measuring period.
- the flatness flatness measuring cycle can be run after a predeterminable time or a special Event, it can be driven before a change in thickness in the rolling train, it can be driven after a change in thickness in the rolling train or it can also during the execution of the Scherenites be driven on the reel.
- the complete flatness state over the bandwidth is preferably detected or measured.
- these signals are filtered and decomposed into symmetrical and asymmetrical components.
- the asymmetrical portions are preferably used for automatic or (by the operator) manual pivoting of the employment of the last active rolling stand.
- the symmetric or parabolic parts are in the form of center or edge waves for the Flatness control used on the outfeed stand. The procedure of the flatness regulation can be found below.
- the processing of the asymmetrical components or the control of the swivel control or adjustment takes place in a conventional manner analog.
- the speed of the tape tension change (increase or decrease) is so dimensioned that the flatness measurement and control loops can react and that the thickness control is not disturbed or the thickness tolerance itself is not adversely affected.
- the influence of the change in tension on the belt width must also be taken into account and the width must be within the permissible range.
- the set average minimum allowable Bandzugschreibsi between last active finishing stand and the scissors or the reel driver is preferably selected depending on the hot strip thickness, the strip material and the final rolling temperature and automatically taken into account by the process computer.
- a maximum permissible (positive) edge ripple and a (negative) center ripple and / or the maximum detected unevenness over the width are preferably taken into account, which are dependent on different process parameters.
- FIG. 1 it is schematically shown how a strip 1 is cast in a continuous casting process in a casting machine, not shown, and then rolled in a rolling mill, also not shown, to the finished strip. From the rolling mill, only the last active rolling mill 2 is shown. Behind the rolling mill 2 follows in the conveying direction F a scissors driver 3 and a reel driver 4. In the conveying direction F behind the reel driver 4, a reel 5 is arranged. Between the scissors driver 3 and the reel driver 4, a pair of scissors 7 is placed, with the band 1 can be separated by.
- an optical flatness measuring device 6 is also arranged, with which the flatness of the strip 1 can be measured.
- FIG. 1 This procedure is exemplary in FIG. 1 represented for a flatness regulation.
- a flatness measurement is started.
- the strip tensile stress between the rolling train and the scissors or coiler driver is reduced at a predeterminable rate from the nominal tensile stress level of preferably between 5 and 50 N / mm 2 to a lower belt tensile stress of preferably 0 to 10 N / mm 2 .
- This low band tension is given for a certain time in order to allow a flatness measurement and regulation for a predefinable period.
- the measurement period should be as short as possible. It is preferably between 1 sec and less than or a maximum of 20 sec. A minimal measurement period is desired.
- the tensile stress is raised again to the nominal tensile stress level at a likewise predeterminable rate.
- the Bandzuganhebung and the Bandzugabsenkung can be done at different speeds.
- the level of the train between reel driver and reel remains preferably constant.
- the drawdown is automatically interrupted, as shown in FIG. 1 is representative of B in the measuring period (which is behind the time of a measuring period A). It can also be raised in other cases, the train again something. Since an unevenness is present, the flatness controller further changes the work roll bend (not shown) accordingly. If the measured unevenness loosens from its limit, the strip tension can be lowered further.
- the flatness in the corresponding direction can not be improved. Then the reduction in the train level is interrupted or the train level is raised again to the nominal train level, in order to also minimize the active measurement period.
- the setting limit of the profile actuator for example, the work roll bending
- the highly dynamic profile actuator eg the work roll bend
- the process model (PCFC model) records the conditions in the roll gap by cyclic calculations in this changeover phase, controls this release circuit and thus ensures the quality of the strip contour, flatness and flatness of higher order, etc.
- the signal of the mid-band deviation behind the finishing train is also monitored during the measuring period. This means that when exceeding the maximum permissible midband deviation recorded with a measuring device 10, in the positive or negative direction or when exceeding the permissible amount of mid-band deviation change, the tension level between the finishing line and scissors driver is raised back to the nominal tape tension level.
- the flatness detection between the scaffolds is visually performed by the operators manually controlling the work roll deflection and the swivel amount of the thickness adjustment after the tension reduction has been notified to the operator (a manual operation would generally also be possible behind the finishing train).
- the flatness measurement is arranged as close as possible behind the rolling train.
- the flatness measurement behind the rolling mill and / or before the scraper driver - ie behind the cooling section - to order and hereby perform a planarity control or flatness control.
Abstract
Die Erfindung betrifft ein Verfahren zum Herstellen eines metallisches Bandes (1) durch Endloswalzen, wobei in Förderrichtung (F) des Bandes (1) hinter dem letzten Walzgerüst (2) einer Walzstraße eine Förderstrecke für das Band (1) vorliegt, die bis zu einem Scherentreiber (3) und/oder einem Haspeltreiber (4) reicht, wobei zumindest zeitweise in der Förderstrecke eine Nominal-Zugspannung im Band (1) aufrecht erhalten wird. Um dieses Verfahren so weiterzuentwickeln, dass mit geringem Aufwand eine kostengünstige Planheitsmessung und anschließende Planheitsregelung auch beim Endloswalzen erfolgen kann, sieht die Erfindung vor, dass zu definierten Zeitpunkten folgender Messzyklus zur Bestimmung der Planheit des Bandes (1) gefahren wird: a) Verminderung der Zugspannung in dem sich in der Förderstrecke befindlichen Band (1) von der Nominal-Zugspannung auf einen verminderten Zugspannungs-Wert; b) Nach der Durchführung von Schritt a): Messung des Planheitsgrades des Bandes (1) mittels eines optischen Planheits-Messgeräts (6); c) Nach der Durchführung von Schritt b): Erhöhung der Zugspannung in dem sich in der Förderstrecke befindliche Band (1) von dem verminderten Zugspannungs-Wert auf die Nominal-Zugspannung.The invention relates to a method for producing a metallic strip (1) by endless rolling, wherein in the conveying direction (F) of the strip (1) behind the last rolling stand (2) of a rolling train, a conveyor line for the strip (1) is present, up to a Scissors driver (3) and / or a reel driver (4) is sufficient, wherein at least temporarily in the conveyor line a nominal tension in the belt (1) is maintained. In order to further develop this method so that cost-effective flatness measurement and subsequent flatness control can also take place during continuous rolling, the invention provides that at defined times the following measurement cycle is used to determine the flatness of the strip (1): a) Reduction of the tensile stress in the band (1) located in the conveyor line, from the nominal tensile stress to a reduced tensile stress value; b) After performing step a): measurement of the flatness of the belt (1) by means of an optical flatness measuring device (6); c) After performing step b): increasing the tension in the located in the conveyor line band (1) of the reduced tension value to the nominal tensile stress.
Description
Die Erfindung betrifft ein Verfahren zum Herstellen eines metallisches Bandes durch Endloswalzen, bei dem zunächst in einer Gießanlage das Band gegossen und dieses anschließend kontinuierlich in einer Walzstraße mit mindestens einem Walzgerüst zum fertigen Band gewalzt wird, wobei in Förderrichtung des Bandes hinter dem letzten Walzgerüst eine Förderstrecke für das Band vorliegt, die bis zu einem Scherentreiber und/oder einem Haspeltreiber reicht, oder wobei zwischen zwei Walzgerüsten der Walzstraße eine Förderstrecke vorliegt, wobei hinter dem Scherentreiber und/oder dem Haspeltreiber ein Haspel zum Aufwickeln des fertigen Bandes angeordnet ist, wobei zumindest zeitweise in der Förderstrecke eine Nominal-Zugspannung im Band aufrecht erhalten wird.The invention relates to a method for producing a metallic strip by endless rolling, in which cast first in a casting the tape and this is then rolled continuously in a rolling mill with at least one rolling mill to the finished tape, wherein in the conveying direction of the belt behind the last stand a conveyor line is present for the strip, which extends to a scraper driver and / or a reel driver, or wherein there is a conveyor line between two stands of the rolling train, wherein behind the scraper driver and / or the reel driver a reel for winding the finished tape is arranged, at least temporarily in the conveyor line a nominal tension in the band is maintained.
Eine Planheitsmessung und -regelung für Warmband hinter einer Warmbandstraße ist bekannt. Bei einer sogenannten Batch-Walzung (Walzen von einzelnen Bändern hintereinander) wird die Unplanheit optisch am zuglosen Bandkopfbereich erfasst und in der Regel mit Hilfe des dynamischen Profilstellgliedes einer Arbeitswalzenbiegung beseitigt. Bei Messung von Mittenwellen wird die Arbeitswalzenbiegung vermindert und bei Randwellen erhöht. Ein hierbei typischerweise zum Einsatz kommendes optisches Planheitsmessgerät offenbart die
Beim sogenannten Endloswalzen - gemäß dem gattungsgemäßen Verfahren - sind eine Gießanlage und eine Walzstraße miteinander verbunden. Hier werden einzelne Coils durch Trennen des Endlosbandes mit einer Schere erst kurz vor dem Haspel erzeugt. Ein Endlos-Gieß-Walzvorgang kann dabei mehrere Stunden dauern. Da das Band zwischen der Walzstraße und dem Haspel unter Zug steht, zeigt hierbei in der Regel ein optisches Planheitsmessgerät kein brauchbares Ergebnis an.In so-called continuous rolling - according to the generic method - a casting plant and a rolling mill are connected. Here, individual coils are produced by cutting the endless belt with scissors until shortly before the reel. An endless casting rolling process can take several hours. Since the strip is under tension between the rolling train and the reel, an optical flatness meter usually does not show a usable result.
Um bei dieser langen Zeit die Bandqualität sicherzustellen, wird nach einer bekannten Methode mit einer Planheitsmessrolle die Planheit erfasst, indem mit einer Messrolle die Zugspannungsverteilung gemessen und so indirekt die Planheit bestimmt wird. Eine derartige Planheitsmessrolle für den Anwendungsfall des Endloswalzens offenbart beispielsweise die
Die Planheitsmessrolle ist jedoch ein kostenaufwändiges und wartungsintensives Messgerät. Wenn eine Anlage im Batch- und Endlosmodus betrieben wird, wird häufig zusätzlich ein optisches Planheitsmessgerät gewünscht.However, the flatness measuring roll is a costly and maintenance-intensive measuring device. If a system is operated in batch and endless mode, an optical flatness meter is often required in addition.
Dies liefert beim Endloswalzen allerdings aufgrund des oben dargestellten Sachverhalts kein brauchbares Ergebnis.However, this gives no useful result in endless rolling due to the facts presented above.
Der Erfindung liegt daher die Aufgabe zugrunde, ein gattungsgemäßes Verfahren so weiterzuentwickeln, dass mit geringem Aufwand eine kostengünstige Planheitsmessung und anschließende Planheitsregelung auch beim Endloswalzen erfolgen kann.The invention is therefore the object of further developing a generic method so that with little effort a cost flatness measurement and subsequent flatness control can also be done during continuous rolling.
Die Lösung dieser Aufgabe durch die Erfindung ist dadurch gekennzeichnet, dass zu definierten Zeitpunkten folgender Messzyklus zur Bestimmung der Planheit des Bandes gefahren wird:
- a) Verminderung der Zugspannung in dem sich in der Förderstrecke befindlichen Band von der Nominal-Zugspannung auf einen verminderten Zugspannungs-Wert;
- b) Nach der Durchführung von Schritt a): Messung des Planheitsgrades des Bandes mittels eines optischen Planheits-Messgeräts;
- c) Nach der Durchführung von Schritt b): Erhöhung der Zugspannung in dem sich in der Förderstrecke befindliche Band von dem verminderten Zugspannungs-Wert auf die Nominal-Zugspannung.
- a) reducing the tension in the located in the conveyor line band of the nominal tension to a reduced tension value;
- b) After performing step a): measurement of the flatness of the belt by means of an optical flatness measuring device;
- c) After performing step b): increasing the tensile stress in the band located in the conveyor line from the reduced tensile stress value to the nominal tensile stress.
Der Messzyklus kann dabei periodisch wiederholt werden. Es ist dabei bevorzugt vorgesehen, dass der Messzyklus während der Durchführung des Verfahrens alle 2 min bis 10 min wiederholt wird, vorzugsweise alle 4 min bis 6 min.The measuring cycle can be repeated periodically. It is preferably provided that the measuring cycle during the execution of the method is repeated every 2 min to 10 min, preferably every 4 min to 6 min.
Der Messzyklus kann auch vor einer Änderung der Walzdicke des Bandes durchgeführt werden.The measuring cycle can also be carried out before a change in the rolling thickness of the strip.
Weiterhin kann der Messzyklus nach einer Änderung der Walzdicke des Bandes durchgeführt werden.Furthermore, the measuring cycle can be carried out after a change in the rolling thickness of the strip.
Weiterhin kann vorgesehen sein, dass der Messzyklus während der Durchführung eines Scherenschnitts im Bereich des Haspels erfolgt.Furthermore, it can be provided that the measuring cycle takes place during the execution of a shear cut in the region of the reel.
Schließlich kann auch vorgesehen sein, dass der Messzyklus anlassbedingt vom Bedienpersonal der Fertigungsanlage zur Herstellung des Bandes ausgelöst wird.Finally, it can also be provided that the measuring cycle is triggered by the operating personnel of the production facility for the production of the strip due to the nature of the occasion.
Die Durchführung der obigen Schritte a) bis c) erfolgt bevorzugt während eines Zeitraums zwischen 1 sec und 20 sec.The implementation of the above steps a) to c) is preferably carried out for a period of between 1 second and 20 seconds.
Dabei kann weiter vorgesehen werden, dass der Messzeitraum unter Berücksichtigung von Prozessbedingungen und Anlagengrenzen minimiert wird.It can further be provided that the measurement period is minimized taking into account process conditions and plant limits.
Die Nominal-Zugspannung im Band wird dabei, abhängig von der Materialfestigkeit des Bandes, bevorzugt zwischen 10 N/mm2 und 50 N/mm2 gehalten; indes ist bevorzugt vorgesehen, dass der verminderte Zugspannungs-Wert zwischen 0 N/mm2 und 15 N/mm2 (speziell: 0 N/mm2 bis 9 N/mm2) liegt, besonders bevorzugt zwischen 0 N/mm2 und 5 N/mm2. Vorzugsweise wird die Nominal-Zugspannung im Band während des Messzyklus um 40 % bis 100 % reduziert.The nominal tensile stress in the band is, depending on the material strength of the band, preferably held between 10 N / mm 2 and 50 N / mm 2 ; However, it is preferably provided that the reduced tension value between 0 N / mm 2 and 15 N / mm 2 (especially: 0 N / mm 2 to 9 N / mm 2 ), more preferably between 0 N / mm 2 and 5 N / mm 2 . Preferably, the nominal tension in the belt is reduced by 40% to 100% during the measurement cycle.
Die Bandzüge in der Förderstrecke mit der Planheitsmessung bleiben während des Planheitsmesszyklus in den benachbarten Bereichen - also innerhalb der Walzstraße und/oder zwischen Scheren- bzw. Haspeltreiber und/oder Haspel - bevorzugt unverändert.The strip tension in the conveying path with the flatness measurement remain during the flatness measuring cycle in the adjacent areas - ie within the rolling train and / or between scissors or reel driver and / or reel - preferably unchanged.
Weiterhin kann vorgesehen werden, dass innerhalb des Messzyklus eine Durchführung der Planheitsverbesserung von parabolischen oder symmetrischen Planheitsanteilen durch Einsatz der Arbeitswalzenbiegung an mindestens einem Walzgerüst und/oder durch Einsatz einer Schwenkregelung und Verbesserung der asymmetrischen Planheitsanteile durch Veränderung der Anstellpositionen an mindestens einem Walzgerüst erfolgt.Furthermore, it can be provided that, within the measuring cycle, the flatness improvement of parabolic or symmetrical flatness components is carried out by using the work roll bending on at least one rolling stand and / or by using a swivel control and improving the asymmetrical flatness components by changing the setting positions on at least one rolling stand.
Weiterhin kann ein Prozess- und/oder Regelmodell und/oder eine Steuerung eingesetzt werden, um den Messzyklus auszulösen, um die Messlänge festzulegen, um die nominellen und reduzierten Bandzugspannungen während des Messzyklus abhängig von der Warmbanddicke und/oder vom Bandmaterial und/oder der Endwalztemperatur einzustellen und um den Prozess unter Beachtung vorgegebener Prozessgrenzen zu überwachen. In diesem Falle ist bevorzugt vorgesehen, dass die vorgegebenen Prozessgrenzen (Prozesslimits) maximal zulässige Planheitsgrenze (Randwellen, Mittenwellen, maximal erfasste Wellen) und/oder maximal zulässige Bandmittenabweichung und/oder maximale Bandmittenabweichungsänderung, erfasst durch ein Messgerät, beachtet werden und daraus eine Bandzugniveauveränderung, insbesondere eine Bandzugerhöhung, während des Planheitsmesszyklus veranlasst wird.Furthermore, a process and / or control model and / or control can be used to trigger the measurement cycle to set the gauge length, the nominal and reduced tape tensile stresses during the measurement cycle, depending on the hot strip thickness and / or the strip material and / or the final roll temperature to monitor the process and to observe the process limits. In this case, it is preferably provided that the predetermined process limits (process limits) maximum permissible flatness limit (edge waves, center waves, maximum detected waves) and / or maximum permissible midband deviation and / or maximum midband deviation change detected by a measuring device are taken into account and from this a band tension level change, in particular a Bandzugerhöhung, during the flatness measuring cycle is caused.
Zwischen den Messzeiträumen kann das (hochdynamische) Profilstellglied möglichst in die Nähe der Mitte seines Stellbereichs gebracht werden, insbesondere durch Ablösung des Effektes mittels CVC-Verschiebung oder Veränderung des thermischen Crowns.Between the measurement periods, the (highly dynamic) profile actuator can be brought as close as possible to the center of its control range, in particular by detachment of the effect by means of CVC displacement or change of the thermal crown.
Der nach der vorliegenden Erfindung vorgesehene Einsatz einer optischen Planheitsmessung in der oben definierten Förderstrecke ist eine vorteilhafte und kostengünstige Möglichkeit zur genauen und einfachen Erfassung des Planheitszustandes des Bandes. Um beim Endloswalzen die Bandplanheit erfassen zu können, wird vorteilhafterweise der Bandzug zwischen der Warmwalzstraße und dem Haspeltreiber bzw. Scherentreiber für eine bestimmte Messzeit dosiert abgesenkt.The use of an optical flatness measurement in the conveying path defined above according to the present invention is an advantageous and inexpensive possibility for accurate and simple detection of the flatness state of the strip. In order to be able to record the strip flatness during continuous rolling, the strip tension between the hot rolling line and the reel driver or scraper driver is advantageously lowered in a metered manner for a specific measuring time.
Es kann sich bei der Warmwalzstraße um eine mindestens eingerüstige Walzstraße bzw. um eine mehrgerüstige Walzstraße handeln, wie es beispielsweise in der
Im erfindungsgemäß vorgesehenen Messzyklus wird bevorzugt der komplette Planheitszustand über der Bandbreite erfasst bzw. gemessen. Zur Weiterverarbeitung werden diese Signale gefiltert und in symmetrische und asymmetrische Anteile zerlegt. Die asymmetrischen Anteile werden bevorzugt zum automatischen oder (durch den Bediener) manuellen Schwenken der Anstellung des letzten aktiven Walz-Gerüstes herangezogen. Die symmetrischen oder parabolischen Anteile werden in Form von Mitten- oder Randwellen für die Planheitsregelung am Auslaufgerüst verwendet. Zur Vorgehensweise der Planheitsregelung finden sich unten nähere Angaben. Die Verarbeitung der asymmetrischen Anteile oder die Ansteuerung der Schwenkregelung bzw. Anstellung erfolgt in an sich bekannter Weise analog.In the measurement cycle provided according to the invention, the complete flatness state over the bandwidth is preferably detected or measured. For further processing, these signals are filtered and decomposed into symmetrical and asymmetrical components. The asymmetrical portions are preferably used for automatic or (by the operator) manual pivoting of the employment of the last active rolling stand. The symmetric or parabolic parts are in the form of center or edge waves for the Flatness control used on the outfeed stand. The procedure of the flatness regulation can be found below. The processing of the asymmetrical components or the control of the swivel control or adjustment takes place in a conventional manner analog.
Die Geschwindigkeit der Bandzugveränderung (Erhöhung bzw. Verminderung) wird so bemessen, dass die Planheitsmess- und -regelkreise reagieren können und dass die Dickenregelung nicht gestört wird bzw. die Dickentoleranz selbst nicht negativ beeinträchtigt wird. Auch der Einfluss der Zugspannungsänderung auf die Bandbreite muss berücksichtigt werden und die Breite im zulässigen Bereich liegen.The speed of the tape tension change (increase or decrease) is so dimensioned that the flatness measurement and control loops can react and that the thickness control is not disturbed or the thickness tolerance itself is not adversely affected. The influence of the change in tension on the belt width must also be taken into account and the width must be within the permissible range.
Das einzustellende mittlere minimal zulässige Bandzugspannungsniveau zwischen letztem aktiven Fertiggerüst und der Schere bzw. dem Haspeltreiber wird vorzugsweise abhängig von der Warmbanddicke, dem Bandmaterial und der Endwalztemperatur gewählt und automatisch vom Prozessrechner berücksichtigt.The set average minimum allowable Bandzugspannungsniveau between last active finishing stand and the scissors or the reel driver is preferably selected depending on the hot strip thickness, the strip material and the final rolling temperature and automatically taken into account by the process computer.
Für den Messzeitraum werden weiterhin bevorzugt eine maximal zulässige (positive) Randwelligkeit und eine (negative) Mittenwelligkeit oder/und die maximal erfasste Unplanheit über der Breite (also auch die asymmetrischen Anteile) berücksichtigt, die von verschiedenen Prozessparametern abhängig sind. Dabei erfolgt vorteilhaft der Einsatz von möglichst hochdynamischen Profilstellgliedern, wie z. B. der Arbeitswalzenbiegung, um die entsprechend gemessenen Unplanheiten im Messzeitraum in an sich bekannter Weise zu korrigieren.For the measurement period, furthermore, a maximum permissible (positive) edge ripple and a (negative) center ripple and / or the maximum detected unevenness over the width (ie also the asymmetrical components) are preferably taken into account, which are dependent on different process parameters. The use of highly dynamic as possible profile actuators, such as. As the work roll bending to correct the corresponding measured unevenness in the measurement period in a conventional manner.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es zeigen:
- Fig. 1
- (oben) schematisch den Verlauf einer Bandzugspannung in einem fertig gewalzten Band über der Zeit sowie (unten) den Verlauf der Bandplanheit über der Zeit und
- Fig. 2
- einen Ausschnitt aus einer Gieß-Walz-Anlage zur Herstellung eines metallischen Bandes, wobei der Bereich zwischen einem letzten aktiven Walzgerüst und einem Haspel sowie die Wirkungsweise eines Prozessmodells dargestellt ist.
- Fig. 1
- (top) schematically shows the course of a band tensile stress in a finished rolled strip over time and (below) the course of the band flatness over time and
- Fig. 2
- a section of a casting-rolling plant for the production of a metallic strip, wherein the area between a last active rolling stand and a reel and the operation of a process model is shown.
In den Figuren ist schematisch dargestellt, wie ein Band 1 im Endlos-Walzverfahren in einer nicht dargestellten Gießmaschine gegossen und anschließend in einer ebenfalls nicht dargestellten Walzstraße zum fertigen Band gewalzt wird. Von der Walzstraße ist nur das letzte aktive Walzgerüst 2 dargestellt. Hinter dem Walzgerüst 2 folgt in Fördererrichtung F ein Scherentreiber 3 sowie ein Haspeltreiber 4. In Fördererrichtung F hinter dem Haspeltreiber 4 ist ein Haspel 5 angeordnet. Zwischen dem Scherentreiber 3 und dem Haspeltreiber 4 ist eine Schere 7 platziert, mit der das Band 1 durch getrennt werden kann.In the figures, it is schematically shown how a
Hinter dem letzten Walzgerüst 2 und dem Scherentreiber 3 liegt eine Förderstrecke für das Band 1 vor, in der das Band 1 zumindest zeitweise unter einer Nominal-Zugspannung gehalten wird. In besagter Förderstrecke kann auch eine Bandkühlung 8 angeordnet sein.Behind the
Im Bereich der Förderstrecke ist weiterhin ein optisches Planheits-Messgerät 6 angeordnet, mit dem die Planheit des Bandes 1 gemessen werden kann.In the region of the conveyor line, an optical
Wesentlich ist, dass zu definierten Zeitpunkten ein spezieller Messzyklus gefahren wird, mit dem anhand des optischen Planheits-Messgeräts 6 die Planheit des Bandes 1 bestimmt wird.It is essential that at defined times a special measuring cycle is run, with the basis of the optical
Bei diesem Messzyklus wird zunächst die Zugspannung des Bandes 1 von der Nominal-Zugspannung auf einen verminderten Zugspannungs-Wert vermindert.In this measuring cycle, first the tension of the
Anschließend erfolgt die Messung des Planheitsgrades des Bandes 1 mittels des optischen Planheits-Messgeräts 6.Subsequently, the measurement of the degree of flatness of the
Ist dies erfolgt, findet wieder eine Erhöhung der Zugspannung vom verminderten Zugspannungs-Wert auf die Nominal-Zugspannung statt.Once this has occurred, an increase in the tension from the reduced tension value to the nominal tension again takes place.
Diese Vorgehensweise ist exemplarisch in
Die Bandzuganhebung und die Bandzugabsenkung können unterschiedlich schnell erfolgen. Das Niveau des Zuges zwischen Haspeltreiber und Haspel bleibt dabei bevorzugt konstant.The Bandzuganhebung and the Bandzugabsenkung can be done at different speeds. The level of the train between reel driver and reel remains preferably constant.
Wird die maximal positive oder negative Planheitsgrenze oder die asymmetrische oder maximale Planheitsgrenze erreicht, wird automatisch die Zugabsenkung unterbrochen, wie es in
Stellt sich im vorgesehenen Messzeitraum (siehe beispielsweise den Messzeitraum A in
Bei Erreichung des Stell-Limits des Profilstellgliedes (beispielsweise der Arbeitswalzenbiegung) kann die Planheit in der entsprechenden Richtung nicht mehr verbessert werden. Dann wird die Verminderung des Zugniveaus unterbrochen bzw. das Zugniveau wieder auf das nominelle Zugniveau angehoben, um ebenfalls den aktiven Messzeitraum zu minimieren.Upon reaching the setting limit of the profile actuator (for example, the work roll bending), the flatness in the corresponding direction can not be improved. Then the reduction in the train level is interrupted or the train level is raised again to the nominal train level, in order to also minimize the active measurement period.
Zwischen den Messzeiträumen ist vorgesehen, dass das hochdynamische Profilstellglied (z. B. die Arbeitswalzenbiegung) möglichst weit von seinen Stellgrenzen entfernt eingestellt bzw. in die Mitte ihres Stellbereichs gebracht wird, um für den nächsten Messzeitraum optimal in beide Richtungen agieren zu können. Hierzu wird beispielsweise der Walzspalteffekt der Arbeitswalzenbiegung durch eine langsame Veränderung der CVC-Verschiebung (Änderung des Arbeitswalzencrowns) oder durch Änderung der thermischen Crownform durch Änderung des Wassercrowns, Wasserzonenkühlung oder Wasserniveaus ersetzt (= Ablöseschaltung). Das Prozessmodell (PCFC-Modell) erfasst in dieser Umstellungsphase durch zyklische Berechnungen die Bedingungen im Walzspalt, steuert diese Ablöseschaltung und stellt so die Qualität der Bandkontur, Planheit und Planheit höher Ordnung etc. sicher.Between the measurement periods, it is provided that the highly dynamic profile actuator (eg the work roll bend) is adjusted as far as possible from its setting limits or brought into the middle of its setting range in order to be able to act optimally in both directions for the next measurement period. For this purpose, for example, the roll gap effect of the work roll bending is replaced by a slow change of the CVC shift (change of Arbeitswalzencrowns) or by changing the thermal crown shape by changing the water crown, Wasserzonenkühlung or water level (= release circuit). The process model (PCFC model) records the conditions in the roll gap by cyclic calculations in this changeover phase, controls this release circuit and thus ensures the quality of the strip contour, flatness and flatness of higher order, etc.
Sicherheitshalber wird auch das Signal der Bandmittenabweichung hinter der Fertigstraße während des Messzeitraums überwacht. Das bedeutet, dass bei Überschreitung der maximal zulässigen Bandmittenabweichung, erfasst mit einem Messgerät 10, in positiver oder negativer Richtung oder bei Überschreitung des zulässigen Betrages der Bandmittenabweichungsänderung das Zugniveau zwischen Fertigstraße und Scheren- bzw. Haspeltreiber wieder auf das nominelle Bandzugspannungsniveau angehoben wird.For safety's sake, the signal of the mid-band deviation behind the finishing train is also monitored during the measuring period. This means that when exceeding the maximum permissible midband deviation recorded with a measuring
Die entsprechend teilweise oben bereits genannten Abhängigkeiten, Abläufe, Limits, Minima und Maxima für die Werte sowie die Prozessparameter Planheit, Dicke, Breite, Dickenabweichung etc. werden von einem Prozessmodell gesetzt, gesteuert oder/und geregelt. Die wichtigsten oben erwähnten Komponenten bzw. Einflussgrößen sind aus der Darstellung gemäß
Die obigen Erläuterungen beziehen sich auf die Planheits- und Schwenkregelung und gezielte Zugniveauveränderung zwischen einem aktiven Walzgerüst (und zwar dem letzten aktiven Walzgerüst der Walzstraße) und einem Treiber. Generell gilt, dass diese Vorgehensweise jedoch auch zwischen zwei Fertiggerüsten innerhalb der Warmbandstraße anwendbar ist. Hierzu würde zwischen den Gerüsten ein optisches Planheitsmessgerät installiert.The above explanations relate to the flatness and swivel control and targeted tension level change between an active rolling stand (namely, the last rolling mill active mill) and a driver. In general, however, this procedure can also be used between two finishing stands within the hot strip mill. For this purpose, an optical flatness meter would be installed between the stands.
Alternativ erfolgt die Planheitserfassung zwischen den Gerüsten visuell durch die Bediener, die die Arbeitswalzenbiegung und den Schwenkbetrag der Dickenanstellung manuell steuern, nachdem die Zugspannungsverminderung dem Bediener mitgeteilt wurde (eine manuelle Fahrweise wäre generell auch hinter der Fertigstraße möglich).Alternatively, the flatness detection between the scaffolds is visually performed by the operators manually controlling the work roll deflection and the swivel amount of the thickness adjustment after the tension reduction has been notified to the operator (a manual operation would generally also be possible behind the finishing train).
Bevorzugt ist die Planheitsmessung möglichst dicht hinter der Walzstraße angeordnet. Es ist jedoch auch möglich, bei der Anwendung des oben beschriebenen Verfahrens die Planheitsmessung hinter der Walzstraße oder/und vor dem Scherentreiber - d. h. hinter der Kühlstrecke - anzuordnen und hiermit eine Planheitsregelung bzw. Planheitskontrolle durchzuführen.Preferably, the flatness measurement is arranged as close as possible behind the rolling train. However, it is also possible in the application of the method described above, the flatness measurement behind the rolling mill and / or before the scraper driver - ie behind the cooling section - to order and hereby perform a planarity control or flatness control.
- 11
- Bandtape
- 22
- Walzgerüstrolling mill
- 33
- Scherentreiberscissors driver
- 44
- Haspeltreibercoiler drive
- 55
- Haspelreel
- 66
- optisches Planheits-Messgerätoptical flatness measuring device
- 77
- Scherescissors
- 88th
- Bandkühlungstrip cooling
- 99
- Prozessmodell / RegelmodellProcess Model / Rule Model
- 1010
- Messgerät zur Erfassung der BandmittenabweichungMeasuring device for recording the mid-band deviation
- FF
- Förderrichtungconveying direction
Claims (17)
wobei in Förderrichtung (F) des Bandes (1) hinter dem letzten Walzgerüst (2) eine Förderstrecke für das Band (1) vorliegt, die bis zu einem Scherentreiber (3) und/oder einem Haspeltreiber (4) reicht, oder wobei zwischen zwei Walzgerüsten der Walzstraße eine Förderstrecke vorliegt,
wobei hinter dem Scherentreiber (3) und/oder dem Haspeltreiber (4) ein Haspel (5) zum Aufwickeln des fertigen Bandes (1) angeordnet ist,
wobei zumindest zeitweise in der Förderstrecke eine Nominal-Zugspannung im Band (1) aufrecht erhalten wird,
dadurch gekennzeichnet, dass
zu definierten Zeitpunkten folgender Messzyklus zur Bestimmung der Planheit des Bandes (1) gefahren wird:
wherein in the conveying direction (F) of the belt (1) behind the last rolling stand (2) there is a conveyor line for the belt (1), which extends to a scraper driver (3) and / or a reel driver (4), or wherein between two Rolling mills of the rolling train is a conveyor line,
wherein behind the scraper driver (3) and / or the reel driver (4) a reel (5) for winding up the finished strip (1) is arranged,
wherein a nominal tensile stress in the belt (1) is maintained at least temporarily in the conveying path,
characterized in that
at defined times, the following measuring cycle is used to determine the flatness of the strip (1):
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DE102015216930 | 2015-09-03 | ||
DE102015223600.5A DE102015223600A1 (en) | 2015-09-03 | 2015-11-27 | Method for producing a metallic strip by endless rolling |
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