EP1336437A1 - Flatness-control of strip-edges - Google Patents
Flatness-control of strip-edges Download PDFInfo
- Publication number
- EP1336437A1 EP1336437A1 EP03003777A EP03003777A EP1336437A1 EP 1336437 A1 EP1336437 A1 EP 1336437A1 EP 03003777 A EP03003777 A EP 03003777A EP 03003777 A EP03003777 A EP 03003777A EP 1336437 A1 EP1336437 A1 EP 1336437A1
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- EP
- European Patent Office
- Prior art keywords
- work rolls
- flatness
- heat
- metal strip
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
- B21B37/32—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control by cooling, heating or lubricating the rolls
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
- B21B27/106—Heating the rolls
Definitions
- the invention relates to a method and a device for controlling the flatness of a metal strip during rolling, especially with reducing rolling, with the help at least one roll stand with work rolls, means for at least partially heating the work rolls and a controller in which the Areas of the work rolls close to the belt edge require heat is determined and the corresponding areas of Work rolls are heated.
- the conventional method uses mechanical Flatness actuators such as work roll bending, inflatable back-up rolls Work rolls tried the flatness of the strip edges to positively influence. These methods can do that improve the general flatness of the rolled product, avoiding or reducing belt edge errors is not possible with them.
- a disadvantage of the previously known methods is that due to the scheme with the help of a Flat position detection only one adjustment already resulting band edge error can occur. The Belt edge errors can therefore not be prevented.
- the "hot edge spray" process provided a relatively high heating output to actually influence band edge errors because in the above method due to the follow-up regulation to larger temperature gradients that comes using high heat outputs must be corrected.
- the The invention is therefore based on the object of a method or a device for performing the method for To make available with which or with which Band edge defects more effectively prevented can be.
- the method according to the invention is therefore a precontrol procedure, which does not apply to a subsequent measurement of the flatness of the strip edge is instructed to suppress banker errors.
- Is according to an embodiment of the invention Method for controlling the flatness of a metal strip in Rolling the heat requirement of the next to the belt Zones of the work rolls predetermined, so it can Warm the work rolls on the next to the belt zones can be restricted. Only the exactly the amount of energy required to feed the roll gap to keep flat at the edge of the belt.
- a particularly exact flatness control is according to one next advantageous embodiment of the achieved method in that the Controlled by an at least partially continuous Process simulation predetermines the heat requirement.
- deviations can occur during operation of the rollers for predetermining the heat requirement be taken into account.
- the accuracy of the prediction of the heat demand can be further increased by according to a further developed embodiment, the process simulation the energy balance, especially the energy flows, calculated between the metal strip and the work rolls, to predict the heat requirement.
- the process simulation the energy balance, especially the energy flows, calculated between the metal strip and the work rolls, to predict the heat requirement.
- the work done the resulting Frictional heat and heat conduction from the metal strip the work rolls and vice versa.
- This embodiment can advantageously be further developed become dependent on the energy flows
- Material data of the metal strip and / or data of the Roll stand and / or data of the current rolling situation and / or the flatness measurement value can be determined.
- the method according to the invention is therefore neither based on certain material of the metal strip, for example Aluminum or an aluminum alloy, limited, yet there is limitation on which to use Rolling mills.
- the procedure is almost all Rolling operations can be used, which flatness errors in Have near the strip edge as a potential source of error.
- Heat is at least partially supplied continuously, there is no formation of large temporal Temperature fluctuations in the next to the band zones of the work roll that are corrected Need to become.
- the one to be introduced per roller revolution Heat for compensation is relatively low, which insufficient heating power to be installed and leads according to inexpensive designs.
- the heat is applied before the metal strip runs in or behind the nip, the heat can be right next to it the areas of the work rolls are fed, which next contact with the metal strip to be rolled to have.
- the heating of the Work roll directly behind the roll gap, as that in the Area of the work rolls introduced heat profile is already smoothed by heat dissipation before the Area of the work roll with the metal strip to be rolled comes into contact.
- the method according to the invention is the supply of heat by induction and / or convection and / or radiation.
- this ensures that the heat supply, for example by means of resistance heating Current flow through the work rolls themselves, Infrared radiation, laser radiation or that Spray on with hot lubricants, particularly precisely can be controlled and dosed and on the other hand, that the required heat sources are correspondingly small and can be made compact.
- the previously known devices to control flatness when rolling a metal strip at least one roll stand with work rolls and means for at least partially heating the work rolls improved by having an accurate dose of energy guaranteeing agents, especially inductive ones Means for at least partially heating the Work rolls are provided.
- an exact Dosing of the heat supplied can also be done so far known device for flatness control clearly can be improved since the previously known systems only allow inaccurate temperature control.
- the thermal profile can be improved of the work rolls closer to the edge of the strip and the band edge errors are reduced.
- inductively working means for partial heating of the work rolls for use in a device according to the invention since it can provide required amounts of energy, a allow precise dosing of these amounts of energy and are also not susceptible to interference.
- the heat demand to the Areas of the work rolls close to the belt edge predetermined and the means to at least partially Heating the work roll control provided the heat demand to the Areas of the work rolls close to the belt edge predetermined and the means to at least partially Heating the work roll control provided , the occurrence of ribbon edge defects can be effective be prevented and the quality of the rolled products be further increased.
- Predetermination of the heat requirement of the edge near the belt edge Areas of the work rolls can be further improved by continuing according to a next Embodiment of the embodiment of the invention device according to the invention.
- a flatness measuring roller for flatness detection of the metal strip after rolling is provided.
- the subsequent checking of the flatness of the parameters for Predetermination of the heat requirement can be adjusted.
- the means to at least partially heat the Work rolls before the entry of the metal strip and / or arranged behind the roll gap so can be easily Way of the work roll in the areas close to the belt edge the heat before contact with the metal strip to be rolled are fed.
- the arrangement of the means at least partial heating behind the nip as the Dissipation of the heat supplied until contact of the Work rolls with the metal strip to be rolled into one particularly homogeneous thermal profile of the work rolls leads.
- FIG. 1 Flatness control device for rolling a Metal strip 1 has two work rolls 2, 3 in one Roll stand, means 4 for at least partial heating the work roll 2, a controller 5 and a Flatness measuring roller 6. Now the metal strip 1 with of this device, the controller 5 calculates in a simulation of the rolling process ideal rolling work that has to be done. This sets together from the forming work Material thickness reduction, the resulting Forming heat and the frictional heat actually Rolling process. In the process simulation is now for the Energy conversion in the roll gap that the strip or Work roll supplied specific heat output related calculated on the contact area. From the sum of these Thermal output then results in the thermal output that the Work roll 2 must be fed to jump in thermal profile of the work roll 2 in the area of Compensate band edge.
- the controller 5 intervenes the means 4 for at least partially heating the Work roll 2 in the predetermination of the heat requirement via a process simulation on the data 8 of the Roll stand and material data 9 of the to be rolled Material back.
- a means 4 to at least partially Heating the work rolls 2 is an inductive one Heat source provided, which is behind the nip 7th is arranged. This arrangement allows a smoothing of the thermal profile arising on the work roll in Circumferential direction by heat dissipation, which by the exactly working inductive heat source is influenced. The thermal profile of the work roll 2 is therefore also almost constant in the axial direction.
- the process simulation results in ideal rolling work of 919 kW.
- the simulation of the energy conversion in the roll gap shows that the strip has a specific heat output of 44.6 W / mm 2 and the roller has a heat output of 7.8 W / mm 2 based on the contact area is supplied.
- the calculation shows that the means 4 for at least partially heating the work roll must supply the work roll 2 with a power of 52 W / mm 2 in addition to the strip edge.
- Fig. 2 shows the area of a strip edge of a metal strip 1 as well as the thermal profile 11.12 of the work rolls in Band edge area 10 with and without edge heating.
- the thermal profile of the work rolls without edge heating 11 is not homogeneous in the area of the band edge because due to the decreasing temperature towards the outside Work roll the diameter of the work roll already in Area of the strip edge decreases.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Magnetic Heads (AREA)
- Wire Bonding (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Planheitssteuerung eines Metallbandes beim Walzen, insbesondere beim reduzierenden Walzen, mit Hilfe mindestens eines Walzgerüstes mit Arbeitswalzen, Mitteln zum zumindest teilweisen Erwärmen der Arbeitswalzen und einer Steuerung, bei welchem bzw. bei welcher der Wärmebedarf bandkantennaher Bereiche der Arbeitswalzen bestimmt wird und die entsprechenden Bereiche der Arbeitswalzen erwärmt werden.The invention relates to a method and a device for controlling the flatness of a metal strip during rolling, especially with reducing rolling, with the help at least one roll stand with work rolls, means for at least partially heating the work rolls and a controller in which the Areas of the work rolls close to the belt edge require heat is determined and the corresponding areas of Work rolls are heated.
Beim Walzen, insbesondere beim reduzierenden Walzen, von Metallen ist die Ausbildung von Bandkantenfehlern ein bekanntes Problem. Aufgrund der aus der Umformarbeit zur Materialdickenreduzierung entstehenden Umformwärme und der Reibungswärme bildet sich beim Walzen ein thermisches Profil in den Arbeitswalzen aus. Infolge des sich ausbildenden thermischen Profils in den Arbeitswalzen kommt es zu einer lokalen Wärmedehnung und somit zu unterschiedlichen Durchmesserzuwächsen der Arbeitswalzen. Die aus dem Sprung des thermischen Profils an der Bandkante resultierenden senkrecht zur Walzrichtung verlaufenden Inhomogenitäten der Verformung der Arbeitswalzen lokalisieren sich insbesondere im Bereich der Bandkanten. Diese führen zu typischen Planheitsfehlern der Bandkanten nach dem Walzen.When rolling, especially reducing rolling, from Metals is the formation of strip edge defects known problem. Because of the work from forming Forming heat and the resulting reduction in material thickness the frictional heat forms a thermal one during rolling Profile in the work rolls. As a result of the forming thermal profile in the work rolls there is a local thermal expansion and thus different diameter increases of the work rolls. The jump from the thermal profile to the Strip edge resulting perpendicular to the rolling direction running inhomogeneities of the deformation of the Work rolls are particularly localized in the area the band edges. These lead to typical ones Flatness errors of the strip edges after rolling.
Bei den konventionellen Verfahren wird über mechanische Planheitsstellglieder wie Arbeitswalzenbiegung, aufblasbare Stützwalzen oder hinterschliffene Arbeitswalzen versucht, die Planheit der Bandkanten positiv zu beeinflussen. Diese Verfahren können zwar das allgemeine Planheitsbild des Walzproduktes verbessern, eine Vermeidung oder Reduzierung von Bandkantenfehlern ist mit ihnen jedoch nicht möglich.The conventional method uses mechanical Flatness actuators such as work roll bending, inflatable back-up rolls Work rolls tried the flatness of the strip edges to positively influence. These methods can do that improve the general flatness of the rolled product, avoiding or reducing belt edge errors is not possible with them.
Bei neueren noch in der Entwicklung befindlichen Verfahren werden zur Lösung des Problems die Walzenränder mit heißen Schmierstoffen, zumeist durch Aufsprühen (hot edge spray), beaufschlagt, wobei die Beaufschlagung abhängig von einem Planheitsmesswert einer hinter dem Walzspalt angeordneten Planlageerfassung gesteuert wird. Durch die zusätzliche Energiezufuhr in den bandkantennahen Bereichen der Arbeitswalzen kann das sich ausbildende thermische Profil der Arbeitswalzen derart beeinflusst werden, dass die Inhomogenitäten der Verformung der Arbeitswalzen außerhalb des zu walzenden Metallbandes liegen. Aufgrund der schlechten Temperaturführung bei diesem Verfahren gelingt dies jedoch nur eingeschränkt.With newer ones still under development Processes are used to solve the problem of roller edges with hot lubricants, usually by spraying (hot edge spray), applied, the loading depending on a flatness measurement one behind the Roll gap arranged flatness detection is controlled. Due to the additional energy supply in the Areas of the work rolls near the belt edge can do this forming thermal profile of the work rolls in such a way be influenced that the inhomogeneities of the Deformation of the work rolls outside of the one to be rolled Metal band lie. Because of the bad Temperature control succeeds in this process however only to a limited extent.
Nachteilig bei den bisher bekannten Verfahren ist nun, dass aufgrund der Regelung mit Hilfe einer Planlageerfassung nur eine Ausregelung bereits entstandener Bandkantenfehler erfolgen kann. Die Bandkantenfehler können somit nicht unterbunden werden. Darüber hinaus muss bei dem "hot-edge-spray" Verfahren eine relativ hohe Heizleistung zur Verfügung gestellt werden, um Bandkantenfehler tatsächlich zu beeinflussen, da es bei dem oben genannten Verfahren aufgrund der nachführenden Regelung zu größeren Temperaturgradienten kommt, die unter Verwendung hoher Heizleistungen ausgeregelt werden müssen. A disadvantage of the previously known methods is that that due to the scheme with the help of a Flat position detection only one adjustment already resulting band edge error can occur. The Belt edge errors can therefore not be prevented. In addition, the "hot edge spray" process provided a relatively high heating output to actually influence band edge errors because in the above method due to the follow-up regulation to larger temperature gradients that comes using high heat outputs must be corrected.
Ausgehend von dem erläuterten Stand der Technik liegt der Erfindung somit die Aufgabe zugrunde, ein Verfahren bzw. eine Vorrichtung zur Durchführung des Verfahrens zur Verfügung zu stellen, mit welchem bzw. mit welcher das Auftreten von Bandkantenfehlern effektiver verhindert werden kann.Based on the explained prior art, the The invention is therefore based on the object of a method or a device for performing the method for To make available with which or with which Band edge defects more effectively prevented can be.
Erfindungsgemäß ist die zuvor hergeleitete und aufgezeigte Aufgabe für ein Verfahren zur Planheitssteuerung eines Metallbandes beim Walzen dadurch gelöst, dass der Wärmebedarf der bandkantennahen Bereiche der Arbeitswalzen vorherbestimmt und abhängig davon die Mittel zum zumindest teilweisen Erwärmen der Arbeitswalzen gesteuert werden. Das erfindungsgemäße Vorherbestimmen des Wärmebedarfs der bandkantennahen Bereiche der Arbeitswalzen und die entsprechende Steuerung der Mittel zum zumindest teilweisen Erwärmen der Arbeitswalzen gewährleistet, dass sich die Arbeitswalzen über die Bandkante hinaus homogen thermisch ausdehnen und der Walzspalt damit auch im Bereich der Bandkanten konstant bleibt. Das Auftreten von Bandkantenfehlern kann somit effektiv unterdrückt werden.According to the previously derived and Outlined task for a method for Flatness control of a metal strip during rolling solved that the heat requirement of the areas close to the belt edge predetermined of the work rolls and depending on that Means for at least partially heating the Work rolls are controlled. The invention Predetermining the heat requirement of the edge near the belt edge Areas of the work rolls and the corresponding Control of the means for at least partial heating of the work rolls ensures that the Work rolls homogeneously thermally beyond the belt edge expand and the roll gap in the area of Band edges remains constant. The appearance of Belt edge errors can thus be effectively suppressed.
Das erfindungsgemäße Verfahren ist daher ein vorsteuerndes Verfahren, welches nicht auf einen nachfolgende Messung der Planheit der Bandkante angewiesen ist, um Bankantenfehler zu unterdrücken.The method according to the invention is therefore a precontrol procedure, which does not apply to a subsequent measurement of the flatness of the strip edge is instructed to suppress banker errors.
Wird gemäß einer Ausführungsform des erfindungsgemäßen Verfahrens zur Planheitssteuerung eines Metallbandes beim Walzen der Wärmebedarf der neben dem Band befindlichen Zonen der Arbeitswalzen vorherbestimmt, so kann das Erwärmen der Arbeitswalzen auf die neben dem Band befindlichen Zonen beschränkt werden. Dabei wird nur die exakt benötigte Energiemenge zugeführt, um den Walzspalt an der Bandkante eben zu halten.Is according to an embodiment of the invention Method for controlling the flatness of a metal strip in Rolling the heat requirement of the next to the belt Zones of the work rolls predetermined, so it can Warm the work rolls on the next to the belt zones can be restricted. Only the exactly the amount of energy required to feed the roll gap to keep flat at the edge of the belt.
Dadurch, dass gemäß einer weitergebildeten Ausführungsform des erfindungsgemäßen Verfahrens eine Planlageerfassung zur Verbesserung der Vorherbestimmung des Wärmebedarfs einen Planheitsmesswert des Metallbandes nach dem Walzen, insbesondere mit einer Planheitsmessrolle, ermittelt, kann die Planheit des gewalzten Metallbandes überprüft werden und Parameter zur Vorherbestimmung des Wärmebedarfs gegebenenfalls angepasst werden.The fact that according to a trained Embodiment of the method according to the invention Flatness detection to improve predetermination a flatness measurement of the metal strip after rolling, especially with a Flatness measuring roller, determined, the flatness of the rolled metal strip are checked and parameters for Predetermination of the heat requirement if necessary be adjusted.
Eine besonders exakte Planheitssteuerung wird gemäß einer nächsten vorteilhaften Ausführungsform des erfindungsgemäßen Verfahrens dadurch erreicht, dass die Steuerung durch eine zumindest teilweise kontinuierliche Prozesssimulation den Wärmebedarf vorherbestimmt. Zusätzlich können auch Abweichungen im laufenden Betrieb der Walzen zur Vorherbestimmung des Wärmebedarfs berücksichtigt werden.A particularly exact flatness control is according to one next advantageous embodiment of the achieved method in that the Controlled by an at least partially continuous Process simulation predetermines the heat requirement. In addition, deviations can occur during operation of the rollers for predetermining the heat requirement be taken into account.
Die Genauigkeit der Vorherbestimmung des Wärmebedarfs kann dadurch weitergesteigert werden, indem gemäß einer weitergebildeten Ausführungsform die Prozesssimulation die Energiebilanz, insbesondere die Energieflüsse, zwischen dem Metallband und den Arbeitswalzen berechnet, um den Wärmebedarf vorherzubestimmen. Insbesondere können so die geleistete Umformarbeit, die entstehende Reibungswärme sowie die Wärmeleitung vom Metallband auf die Arbeitswalzen und umgekehrt berücksichtigt werden. The accuracy of the prediction of the heat demand can be further increased by according to a further developed embodiment, the process simulation the energy balance, especially the energy flows, calculated between the metal strip and the work rolls, to predict the heat requirement. In particular can so the work done, the resulting Frictional heat and heat conduction from the metal strip the work rolls and vice versa.
Vorteilhaft kann diese Ausführungsform weitergebildet werden, indem die Energieflüsse abhängig von Materialdaten des Metallbandes und/oder Daten des Walzgerüstes und/oder Daten der aktuellen Walzsituation und/oder des Planheitsmesswertes bestimmt werden. Das erfindungsgemäße Verfahren ist damit weder auf ein bestimmtes Material des Metallbandes, beispielsweise Aluminium oder eine Aluminiumlegierung, beschränkt, noch gibt es Einschränkung bezüglich der zu verwendenden Walzgerüste. Das Verfahren ist damit bei nahezu allen Walzvorgängen einsetzbar, welche Planheitsfehler in Bandkantennähe als potentielle Fehlerquelle besitzen.This embodiment can advantageously be further developed become dependent on the energy flows Material data of the metal strip and / or data of the Roll stand and / or data of the current rolling situation and / or the flatness measurement value can be determined. The The method according to the invention is therefore neither based on certain material of the metal strip, for example Aluminum or an aluminum alloy, limited, yet there is limitation on which to use Rolling mills. The procedure is almost all Rolling operations can be used, which flatness errors in Have near the strip edge as a potential source of error.
Dadurch, dass gemäß einer weitergebildeten nächsten Ausführungsform des erfindungsgemäßen Verfahrens die Wärme zumindest teilweise kontinuierlich zugeführt wird, kommt es nicht zur Ausbildung großer zeitlicher Temperaturschwankungen in den neben dem Band befindlichen Zonen der Arbeitswalze, die ausgeregelt werden müssen. Die pro Walzenumdrehung einzubringende Wärme zur Kompensation ist damit relativ gering, welches zu geringen zu installierenden Heizleistungen und entsprechend kostengünstigen Bauweisen führt.In that according to a trained next Embodiment of the method according to the invention Heat is at least partially supplied continuously, there is no formation of large temporal Temperature fluctuations in the next to the band zones of the work roll that are corrected Need to become. The one to be introduced per roller revolution Heat for compensation is relatively low, which insufficient heating power to be installed and leads according to inexpensive designs.
Erfolgt die Wärmezufuhr vor dem Einlauf des Metallbandes oder hinter dem Walzspalt, kann die Wärme direkt neben den Bereichen der Arbeitswalzen zugeführt werden, welche als nächstes Kontakt mit dem zu walzenden Metallband haben. Bevorzugt wird dabei die Erwärmung der Arbeitswalze direkt hinter dem Walzspalt, da das in den Bereich der Arbeitswalzen eingebrachte Wärmeprofil bereits durch Wärmedissipation geglättet ist, bevor der Bereich der Arbeitswalze mit dem zu walzenden Metallband in Kontakt tritt. The heat is applied before the metal strip runs in or behind the nip, the heat can be right next to it the areas of the work rolls are fed, which next contact with the metal strip to be rolled to have. The heating of the Work roll directly behind the roll gap, as that in the Area of the work rolls introduced heat profile is already smoothed by heat dissipation before the Area of the work roll with the metal strip to be rolled comes into contact.
Gemäß einer nächsten vorteilhaften Ausführungsform des erfindungsgemäßen Verfahrens erfolgt die Wärmezufuhr durch Induktion und/oder Konvektion und/oder Strahlung. Dies gewährleistet einerseits, dass die Wärmezufuhr, beispielsweise durch Widerstandserwärmung mittels Stromfluss durch die Arbeitswalzen selbst, Infrarotstrahlung, Laserstrahlung oder aber das Aufsprühen mit heißen Schmierstoffen, besonders genau kontrolliert und dosiert werden kann und andererseits, dass die benötigten Wärmequellen entsprechend klein und kompakt ausgeführt werden können.According to a next advantageous embodiment of the The method according to the invention is the supply of heat by induction and / or convection and / or radiation. On the one hand, this ensures that the heat supply, for example by means of resistance heating Current flow through the work rolls themselves, Infrared radiation, laser radiation or that Spray on with hot lubricants, particularly precisely can be controlled and dosed and on the other hand, that the required heat sources are correspondingly small and can be made compact.
Erfindungsgemäß werden die bisher bekannten Vorrichtungen zur Planheitssteuerung beim Walzen eines Metallbandes mit mindestens einem Walzgerüst mit Arbeitswalzen und Mitteln zum zumindest teilweisen Erwärmen der Arbeitswalzen dadurch verbessert, dass eine genaue Energiedosis gewährleistende Mittel, insbesondere induktiv arbeitende Mittel, zum zumindest teilweisen Erwärmen der Arbeitswalzen vorgesehen sind. Durch eine genaue Dosierung der zugeführten Wärme können auch bisher bekannte Vorrichtung zur Planheitssteuerung deutlich verbessert werden, da die bisher bekannten Systeme nur eine ungenaue Temperaturführung zulassen. Durch die verbesserte Temperaturführung kann das thermische Profil der Arbeitswalzen in Bandkantennähe genauer eingestellt und die Bandkantenfehler reduziert werden. Dabei eignen sich insbesondere induktiv arbeitende Mittel zum teilweisen Erwärmen der Arbeitswalzen zum Einsatz in einer erfindungsgemäßen Vorrichtung, da sie die benötigten Energiemengen bereitstellen können, eine genaue Dosierung dieser Energiemengen zulassen und darüber hinaus nicht störanfällig sind. According to the invention, the previously known devices to control flatness when rolling a metal strip at least one roll stand with work rolls and means for at least partially heating the work rolls improved by having an accurate dose of energy guaranteeing agents, especially inductive ones Means for at least partially heating the Work rolls are provided. By an exact Dosing of the heat supplied can also be done so far known device for flatness control clearly can be improved since the previously known systems only allow inaccurate temperature control. Through the the thermal profile can be improved of the work rolls closer to the edge of the strip and the band edge errors are reduced. Are suitable especially inductively working means for partial heating of the work rolls for use in a device according to the invention, since it can provide required amounts of energy, a allow precise dosing of these amounts of energy and are also not susceptible to interference.
In dem bei einer weitergebildeten Ausführungsform der erfindungsgemäßen Vorrichtung zur Planheitssteuerung beim Walzen eines Metallbandes, eine den Wärmebedarf an den bandkantennahen Bereichen der Arbeitswalzen vorherbestimmende und die Mittel zum zumindest teilweisen Erwärmen der Arbeitswalzen steuernde Steuerung vorgesehen ist, kann das Auftreten von Bandkantenfehlern effektiv unterbunden werden und die Qualität der Walzprodukte weitergesteigert werden.In a further developed embodiment of the Device according to the invention for flatness control Rolling a metal strip, the heat demand to the Areas of the work rolls close to the belt edge predetermined and the means to at least partially Heating the work roll control provided , the occurrence of ribbon edge defects can be effective be prevented and the quality of the rolled products be further increased.
Die Vorherbestimmung des Wärmebedarfs der bandkantennahen Bereiche der Arbeitswalzen kann weiter verbessert werden, indem gemäß einer nächsten weitergebildeten Ausführungsform der erfindungsgemäßen Ausführungsform der erfindungsgemäßen Vorrichtung, eine Planheitsmessrolle zur Planlageerfassung des Metallbandes nach dem Walzen vorgesehen ist. Wie bereits geschildert, können durch die nachträgliche Überprüfung der Planheit die Parameter zur Vorherbestimmung des Wärmebedarfs angepasst werden.Predetermination of the heat requirement of the edge near the belt edge Areas of the work rolls can be further improved by continuing according to a next Embodiment of the embodiment of the invention device according to the invention, a flatness measuring roller for flatness detection of the metal strip after rolling is provided. As already described, the subsequent checking of the flatness of the parameters for Predetermination of the heat requirement can be adjusted.
Werden die Mittel zum zumindest teilweisen Erwärmen der Arbeitswalzen vor dem Einlauf des Metallbandes und/oder hinter dem Walzspalt angeordnet, so kann auf einfache Weise der Arbeitswalze in den bandkantennahen Bereichen die Wärme vor dem Kontakt mit dem zu walzenden Metallband zugeführt werden. Bevorzugt wird, wie oben bereits erwähnt, dabei die Anordnung der Mittel zum zumindest teilweisen Erwärmen hinter dem Walzspalt, da die Dissipation der zugeführten Wärme bis zum Kontakt der Arbeitswalzen mit dem zu walzenden Metallband zu einem besonders homogenen thermischen Profil der Arbeitswalzen führt. Will the means to at least partially heat the Work rolls before the entry of the metal strip and / or arranged behind the roll gap, so can be easily Way of the work roll in the areas close to the belt edge the heat before contact with the metal strip to be rolled are fed. Preference is given, as already above mentioned, the arrangement of the means at least partial heating behind the nip as the Dissipation of the heat supplied until contact of the Work rolls with the metal strip to be rolled into one particularly homogeneous thermal profile of the work rolls leads.
Eine besonders genaue und schnelle Vorherbestimmung des Wärmebedarfs an den bandkantennahen Bereichen der Arbeitswalzen wird gemäß einer nächsten Ausführungsform dadurch erreicht, dass ein Prozessrechner mit integriertem Simulationsmodul als Steuerung vorgesehen ist.A particularly precise and quick prediction of the Heat requirements at the areas near the belt edge Work rolls will be according to a next embodiment achieved by having a process computer with Integrated simulation module provided as a control is.
Es gibt nun eine Vielzahl von Möglichkeiten zur Ausgestaltung des erfindungsgemäßen Verfahrens bzw. der erfindungsgemäßen Vorrichtung zur Planheitssteuerung beim Walzen eines Metallbandes. Hierzu wird beispielsweise einerseits verwiesen auf die den Patentansprüchen 1 und 10 nachgeordneten Patentansprüche und andererseits auf die Beschreibung eines Ausführungsbeispiels in Verbindung mit der Zeichnung. In der Zeichnung zeigt
- Fig. 1
- schematisch ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung zur Planheitssteuerung beim Walzen eines Metallbandes und
- Fig. 2
- den Verlauf des thermischen Profils einer Arbeitswalze im Bereich der Bandkante.
- Fig. 1
- schematically an embodiment of a device according to the invention for flatness control when rolling a metal strip and
- Fig. 2
- the course of the thermal profile of a work roll in the area of the belt edge.
Das in Figur 1 dargestellte Ausführungsbeispiel einer Vorrichtung zur Planheitssteuerung beim Walzen eines Metallbandes 1 weist zwei Arbeitswalzen 2,3 in einem Walzgerüst, Mittel 4 zum zumindest teilweisen Erwärmen der Arbeitswalze 2, eine Steuerung 5 sowie eine Planheitsmessrolle 6 auf. Wird nun das Metallband 1 mit dieser Vorrichtung gewalzt, so berechnet die Steuerung 5 in einer Simulation des Walzprozesses zunächst die ideelle Walzarbeit die geleistet werden muss. Diese setzt sich zusammen aus der Umformarbeit zur Materialdickenreduzierung, der dabei entstehenden Umformwärme und der Reibungswärme im eigentlichen Walzprozess. In der Prozesssimulation wird nun für den Energieumsatz im Walzspalt die dem Band bzw. der Arbeitswalze zugeführte spezifische Wärmeleistung bezogen auf die Kontaktfläche berechnet. Aus der Summe dieser Wärmeleistung ergibt sich dann die Wärmeleistung, die der Arbeitswalze 2 zugeführt werden muss, um einen Sprung im thermischen Profil der Arbeitswalze 2 im Bereich der Bandkante zu kompensieren. Dabei greift die Steuerung 5 der Mittel 4 zum zumindest teilweisen Erwärmen der Arbeitswalze 2 bei der Vorherbestimmung des Wärmebedarfs über eine Prozesssimulation auf die Daten 8 des Walzgerüstes sowie Materialdaten 9 des zu walzenden Werkstoffes zurück. Als Mittel 4 zum zumindest teilweisen Erwärmen der Arbeitswalzen 2 ist hier eine induktive Wärmequelle vorgesehen, welche hinter dem Walzspalt 7 angeordnet ist. Diese Anordnung erlaubt eine Glättung des auf der Arbeitswalze entstehenden thermischen Profils in Umfangrichtung durch Wärmedissipation, welches durch die exakt arbeitende induktive Wärmequelle beeinflusst wird. Das thermische Profil der Arbeitswalze 2 ist damit auch in axialer Richtung nahezu konstant. Zusätzlich kann mit Hilfe der Planheitsmessrolle 6, die hinter dem Walzspalt 7 angeordnet ist, eine Planlageerfassung durchgeführt werden, deren Daten zur Verbesserung der Vorherbestimmung des Wärmebedarfs herangezogen werden können. Ein Bandkantenfehler kann somit durch die Korrektur des Profils der Arbeitswalze bereits vor seiner Entstehung unterbunden werden.The embodiment shown in Figure 1 Flatness control device for rolling a Metal strip 1 has two work rolls 2, 3 in one Roll stand, means 4 for at least partial heating the work roll 2, a controller 5 and a Flatness measuring roller 6. Now the metal strip 1 with of this device, the controller 5 calculates in a simulation of the rolling process ideal rolling work that has to be done. This sets together from the forming work Material thickness reduction, the resulting Forming heat and the frictional heat actually Rolling process. In the process simulation is now for the Energy conversion in the roll gap that the strip or Work roll supplied specific heat output related calculated on the contact area. From the sum of these Thermal output then results in the thermal output that the Work roll 2 must be fed to jump in thermal profile of the work roll 2 in the area of Compensate band edge. The controller 5 intervenes the means 4 for at least partially heating the Work roll 2 in the predetermination of the heat requirement via a process simulation on the data 8 of the Roll stand and material data 9 of the to be rolled Material back. As a means 4 to at least partially Heating the work rolls 2 is an inductive one Heat source provided, which is behind the nip 7th is arranged. This arrangement allows a smoothing of the thermal profile arising on the work roll in Circumferential direction by heat dissipation, which by the exactly working inductive heat source is influenced. The thermal profile of the work roll 2 is therefore also almost constant in the axial direction. In addition, with Help of the flatness measuring roller 6, which is behind the roll gap 7 is arranged, a flat position detection is carried out will be, their data to improve predestination of the heat requirement can be used. On Band edge errors can thus be corrected by Profile of the work roll before it is created be prevented.
Die Vorherbestimmung des Wärmebedarfs soll nun anhand
einer Beispielrechnung erläutert werden. Zu Grunde gelegt
werden dabei folgende typische Daten eines
Aluminiumbandstiches:
Anhand dieser Daten ergibt die Prozesssimulation eine ideelle Walzarbeit von 919 kW. Aus der Energiebilanz der Umformarbeit zur Materialdickenreduzierung, der dabei entstehenden Umformwärme und der Reibungswärme im Walzprozess ergibt sich aus der Simulation des Energieumsatzes im Walzspalt, dass dem Band eine spezifische Wärmeleistung von 44,6 W/mm2 und der Walze eine Wärmeleistung von 7,8 W/mm2 bezogen auf die Kontaktfläche zugeführt wird. Die Berechnung ergibt, dass die Mittel 4 zum zumindest teilweisen Erwärmen der Arbeitswalze der Arbeitswalze 2 neben der Bandkante eine Leistung von 52 W/mm2 zuführen muss.Based on this data, the process simulation results in ideal rolling work of 919 kW. From the energy balance of the forming work to reduce the material thickness, the resulting forming heat and the frictional heat in the rolling process, the simulation of the energy conversion in the roll gap shows that the strip has a specific heat output of 44.6 W / mm 2 and the roller has a heat output of 7.8 W / mm 2 based on the contact area is supplied. The calculation shows that the means 4 for at least partially heating the work roll must supply the work roll 2 with a power of 52 W / mm 2 in addition to the strip edge.
Die Wirkung dieser Wärmezuführung wird in der
schematischen Darstellung des bandkantennahen Bereichs
der Arbeitswalzen 10 in Fig. 2 dargestellt. Fig. 2 zeigt
dabei den Bereich einer Bandkante eines Metallbandes 1
sowie das thermische Profil 11,12 der Arbeitswalzen im
Bandkantenbereich 10 mit und ohne Kantenerwärmung. Das
thermische Profil der Arbeitswalzen ohne Kantenerwärmung
11 ist im Bereich der Bandkante nicht homogen, da
aufgrund der nach außen hin abnehmenden Temperatur der
Arbeitswalze der Durchmesser der Arbeitswalze bereits im
Bereich der Bandkante abnimmt. Wird nun eine zusätzliche
Heizzone 4 im Bandkantenbereich 10, insbesondere direkt
neben den Zonen der Arbeitswalze, welche im Kontakt mit
dem Metallband stehen, angeordnet, so kann durch gezielte
Zuführung von Wärme das thermische Profil der
Arbeitswalzen verändert werden. Wie das thermische Profil
der Arbeitswalzen mit Kantenerwärmung 12 zeigt, ist durch
die zusätzliche Wärmezufuhr mittels der Wärmequelle 4 das
thermische Profil im Bereich der Bandkanten konstant. Das
komplette Metallband unterliegt damit den gleichen
Walzbedingungen, so dass Bandkantenfehler verhindert
werden. Durch die zusätzliche Wärmezufuhr wird der ebene
Teil der Walzspaltöffnung um die in Fig. 2 mit δX
bezeichnete Strecke über die Berührfläche mit dem
Metallband 1 hinausgezogen.The effect of this heat supply is in the
schematic representation of the area near the strip edge
of the work rolls 10 shown in Fig. 2. Fig. 2 shows
the area of a strip edge of a metal strip 1
as well as the thermal profile 11.12 of the work rolls in
Claims (14)
dadurch gekennzeichnet, dass
der Wärmebedarf der bandkantennahen Bereiche der Arbeitswalzen vorherbestimmt und abhängig davon die Mittel zum zumindest teilweisen Erwärmen der Arbeitswalzen gesteuert werden.Method for controlling the flatness of a metal strip during rolling, in particular during reducing rolling, with the aid of at least one roll stand with work rolls, means for at least partially heating the work rolls and a control in which the heat requirement of areas of the work rolls near the strip edges is determined and the corresponding areas of the work rolls are heated .
characterized in that
the heat requirement of the areas of the work rolls near the strip edges is predetermined and depending on this the means for at least partially heating the work rolls are controlled.
dadurch gekennzeichnet, dass
der Wärmebedarf der neben dem Band befindlichen Zonen der Arbeitswalzen vorherbestimmt wird.The method of claim 1
characterized in that
the heat requirement of the zones of the work rolls located next to the belt is predetermined.
dadurch gekennzeichnet, dass
eine Planlageerfassung zur Verbesserung der Vorherbestimmung des Wärmebedarfs einen Planheitsmesswert des Metallbandes nach dem Walzen insbesondere mit einer Planheitsmessrolle ermittelt. The method of claim 1 or 2
characterized in that
a flat position detection to improve the predetermination of the heat requirement determines a flatness measured value of the metal strip after rolling, in particular with a flatness measuring roller.
dadurch gekennzeichnet, dass
die Steuerung durch eine zumindest teilweise kontinuierliche Prozesssimulation den Wärmebedarf vorherbestimmt.Method according to one of claims 1 to 3
characterized in that
the control predetermines the heat requirement by means of an at least partially continuous process simulation.
dadurch gekennzeichnet, dass
die Prozesssimulation die Energiebilanz, insbesondere die Energieflüsse, zwischen dem Metallband und den Arbeitswalzen berechnet, um den Wärmebedarf vorherzubestimmen.Method according to claim 4
characterized in that
the process simulation calculates the energy balance, in particular the energy flows, between the metal strip and the work rolls in order to predict the heat requirement.
dadurch gekennzeichnet, dass
die Energieflüsse abhängig von Materialdaten des Metallbandes und/oder Daten des Walzgerüstes und/oder Daten der aktuellen Walzsituation und/oder des Planheitsmesswertes bestimmt werden.Method according to claim 5
characterized in that
the energy flows are determined as a function of material data of the metal strip and / or data of the roll stand and / or data of the current rolling situation and / or the flatness measured value.
dadurch gekennzeichnet, dass
die Wärme zumindest teilweise kontinuierlich zugeführt wird.Method according to one of claims 1 to 6
characterized in that
the heat is supplied at least partially continuously.
dadurch gekennzeichnet, dass
die Wärmezufuhr vor dem Einlauf des Metallbandes oder hinter dem Walzspalt erfolgt.Method according to one of claims 1 to 7
characterized in that
the heat is supplied before the metal strip runs in or behind the roll gap.
dadurch gekennzeichnet, dass
die Wärmezufuhr durch Induktion und/oder Konvektion und/oder Strahlung und/oder Wärmeleitung erfolgt. Method according to one of claims 1 to 8
characterized in that
the heat is supplied by induction and / or convection and / or radiation and / or heat conduction.
dadurch gekennzeichnet, dass
eine genaue Energiedosis gewährleistende Mittel, insbesondere induktiv arbeitende Mittel, zum zumindest teilweisen Erwärmen der Arbeitswalzen vorgesehen sind.Device for controlling flatness when rolling a metal strip with at least one roll stand with work rolls and means for at least partially heating the work rolls
characterized in that
means ensuring a precise energy dose, in particular inductive means, are provided for at least partially heating the work rolls.
dadurch gekennzeichnet, dass
eine den Wärmebedarf an den bandkantennahen Bereichen der Arbeitswalzen vorherbestimmende und die Mittel zum zumindest teilweisen Erwärmen der Arbeitswalzen steuernde Steuerung vorgesehen ist.Apparatus according to claim 10
characterized in that
a control which predetermines the heat requirement at the areas of the work rolls near the strip edges and which controls the means for at least partially heating the work rolls is provided.
dadurch gekennzeichnet, dass
eine Planheitsmessrolle zur Planlageerfassung des Metallbandes nach dem Walzen vorgesehen ist.Apparatus according to claim 10 or 11
characterized in that
a flatness measuring roller is provided for flatness detection of the metal strip after rolling.
dadurch gekennzeichnet, dass
die Mittel zum zumindest teilweisen Erwärmen der Arbeitswalzen vor dem Einlauf des Metallbandes und/oder hinter dem Walzspalt angeordnet sind.Device according to one of claims 10 to 12
characterized in that
the means for at least partially heating the work rolls are arranged in front of the inlet of the metal strip and / or behind the roll gap.
dadurch gekennzeichnet, dass
ein Prozessrechner mit integriertem Simulationsmodul als Steuerung vorgesehen ist.Device according to one of claims 11 to 13
characterized in that
a process computer with an integrated simulation module is provided as a control.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10206758 | 2002-02-19 | ||
| DE10206758A DE10206758B4 (en) | 2002-02-19 | 2002-02-19 | Strip edge flatness control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1336437A1 true EP1336437A1 (en) | 2003-08-20 |
| EP1336437B1 EP1336437B1 (en) | 2005-10-19 |
Family
ID=27618755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03003777A Expired - Lifetime EP1336437B1 (en) | 2002-02-19 | 2003-02-19 | Flatness-control of strip-edges |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1336437B1 (en) |
| AT (1) | ATE306992T1 (en) |
| DE (2) | DE10206758B4 (en) |
| ES (1) | ES2251632T3 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114728315A (en) * | 2020-01-29 | 2022-07-08 | 普锐特冶金技术日本有限公司 | Rolling mill and method for rolling metal plate |
| DE102023200055A1 (en) | 2022-08-24 | 2024-02-29 | Sms Group Gmbh | Method, computer program product and cold rolling stand for cold rolling a metal strip |
| WO2024041892A1 (en) | 2022-08-24 | 2024-02-29 | Sms Group Gmbh | Method, computer program product and cold rolling stand for the cold rolling of a metal strip |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114798755B (en) * | 2022-04-26 | 2023-02-17 | 东北大学 | Method for analyzing influence of hot crown on plate shape in cold continuous rolling process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2743130A1 (en) * | 1976-12-28 | 1978-06-29 | Voest Ag | DEVICE FOR ROLLING STRIP OR TABLE-SHAPED ROLLED MATERIAL |
| JPS63171209A (en) * | 1987-01-07 | 1988-07-15 | Nippon Steel Corp | Method and device for controlling shape in sheet rolling |
| GB2306362A (en) * | 1995-10-31 | 1997-05-07 | Davy Mckee | Rolling of metal strip |
| DE19830034A1 (en) * | 1998-06-26 | 1999-12-30 | Mannesmann Ag | Method for hot rolling metal especially steel strips |
-
2002
- 2002-02-19 DE DE10206758A patent/DE10206758B4/en not_active Expired - Fee Related
-
2003
- 2003-02-19 DE DE50301385T patent/DE50301385D1/en not_active Expired - Fee Related
- 2003-02-19 EP EP03003777A patent/EP1336437B1/en not_active Expired - Lifetime
- 2003-02-19 ES ES03003777T patent/ES2251632T3/en not_active Expired - Lifetime
- 2003-02-19 AT AT03003777T patent/ATE306992T1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2743130A1 (en) * | 1976-12-28 | 1978-06-29 | Voest Ag | DEVICE FOR ROLLING STRIP OR TABLE-SHAPED ROLLED MATERIAL |
| JPS63171209A (en) * | 1987-01-07 | 1988-07-15 | Nippon Steel Corp | Method and device for controlling shape in sheet rolling |
| GB2306362A (en) * | 1995-10-31 | 1997-05-07 | Davy Mckee | Rolling of metal strip |
| DE19830034A1 (en) * | 1998-06-26 | 1999-12-30 | Mannesmann Ag | Method for hot rolling metal especially steel strips |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 012, no. 437 (M - 765) 17 November 1988 (1988-11-17) * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114728315A (en) * | 2020-01-29 | 2022-07-08 | 普锐特冶金技术日本有限公司 | Rolling mill and method for rolling metal plate |
| EP4074430A4 (en) * | 2020-01-29 | 2023-01-04 | Primetals Technologies Japan, Ltd. | Rolling machine and method for rolling metal sheet |
| DE102023200055A1 (en) | 2022-08-24 | 2024-02-29 | Sms Group Gmbh | Method, computer program product and cold rolling stand for cold rolling a metal strip |
| WO2024041892A1 (en) | 2022-08-24 | 2024-02-29 | Sms Group Gmbh | Method, computer program product and cold rolling stand for the cold rolling of a metal strip |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2251632T3 (en) | 2006-05-01 |
| EP1336437B1 (en) | 2005-10-19 |
| ATE306992T1 (en) | 2005-11-15 |
| DE10206758B4 (en) | 2006-05-18 |
| DE10206758A1 (en) | 2003-08-28 |
| DE50301385D1 (en) | 2005-11-24 |
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