EP2828011B1 - Thermo-mechanical rolling of an aluminium panel - Google Patents

Thermo-mechanical rolling of an aluminium panel Download PDF

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Publication number
EP2828011B1
EP2828011B1 EP13719045.0A EP13719045A EP2828011B1 EP 2828011 B1 EP2828011 B1 EP 2828011B1 EP 13719045 A EP13719045 A EP 13719045A EP 2828011 B1 EP2828011 B1 EP 2828011B1
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EP
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Prior art keywords
rolling
temperature
aluminium plate
pass
state variable
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German (de)
French (fr)
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EP2828011A1 (en
Inventor
Matthias Kurz
Birger Schmidt
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Primetals Technologies Germany GmbH
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Primetals Technologies Germany GmbH
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/001—Aluminium or its alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/06—Thermomechanical rolling
    • 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
    • B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature

Definitions

  • the invention relates to a method for reversely thermomechanical rolling of an aluminum plate in a rolling process with several rolling passes.
  • WO 2008/043684 discloses, for example, a method for tracking the physical condition of a hot plate or strip as part of the control of a rolling line for reversibly processing a hot plate or strip.
  • an initial state of the hot plate or hot strip from which at least one physical state variable is derivable is determined in a model and the state is cyclically updated during the processing of the hot plate using the model, wherein a tracking of the hot plate or hot strip and the condition influencing and / or reproducing operating parameters are taken into account.
  • EP 2 111 309 B1 discloses a method for thermomechanically controlled rolling of a batch of metal slabs into sheets or strips in a rolling mill having at least one rolling stand according to a rolling scheme comprising at least two rolling phases and applied to each slab of the batch.
  • a rolling phase applied to a slab or plate or a strip is followed by another rolling phase which is on another slab or plate or another strip on this rolling stand is applied.
  • the time interval between the start times of their rolling phases is always smaller than the sum of the durations of all rolling phases and all cooling phases of the rolling scheme.
  • EP 1 958 711 A1 discloses a method for thermomechanically controlled rolling of metal slabs in which each metal slab is rolled during at least two rolling phases interrupted by a cooling phase and a plurality of metal slabs are rolled simultaneously.
  • the preamble of claim 1 is based on the document EP 1 958 711 A1 ,
  • EP 2 305 392 A1 discloses a method of rolling rolling in which the rolling process comprises a cooling phase between two hot rolling transformations. During the cooling phase, a temperature difference between a central region and an edge region of the rolling stock is counteracted by heating the edge region.
  • the invention has for its object to provide an improved method for reversing thermomechanical rolling an aluminum plate.
  • characteristic data for the thermal guidance of the rolling process are specified and values of at least one state variable, from which a temperature of the aluminum plate can be derived, are continuously determined.
  • a pass schedule for the rolling process is determined, which provides a rolling break between at least two consecutive rolling passes during which the rolling of the aluminum plate is interrupted for its cooling.
  • the characteristics associate at least one rolling pass with a waiting thickness of the aluminum plate, and the pass plan provides for the beginning of a rolling break as soon as the Thickness of the aluminum plate in this rolling pass reaches or falls below his assigned waiting thickness.
  • An aluminum plate is understood in this application to mean a plate which consists of aluminum or an aluminum alloy.
  • a temperature averaged over a thickness of the aluminum plate or a surface temperature or a residual solidification or phase portions or grain sizes or an enthalpy of the aluminum plate is preferably determined.
  • an aluminum plate is thus rolled temperature-controlled.
  • the temperature of the aluminum plate can be controlled and controlled during the rolling process.
  • the control of the temperature takes place by means of rolling breaks, in which the aluminum plate is cooled.
  • the rolling temperature is known to significantly affect material properties of aluminum plates.
  • the temperature of the aluminum plate during the rolling process can be controlled such that subsequent finishing steps known in the art for thermally generating certain mechanical properties of the aluminum plate material become superfluous to the rolling.
  • Such manufacturing steps are, for example, solution heat treatment, quenching or curing of the aluminum.
  • the invention further provides that the characteristics of at least one rolling break assign a Wiederanwalztemperatur the aluminum plate, and that the stitch plan to stop this Roll break provides as soon as the temperature of the aluminum plate reaches the Bachwalwalztemperatur.
  • the aluminum plate cools during a rolling break to a defined temperature, namely the assigned to it Wiederanwalztemperatur. This advantageously improves the control and control of the temperature of the aluminum plate during the rolling process.
  • An embodiment of the invention provides that the characteristics include a target temperature, and that the stitch plan determines a duration of a rolling break or a Wiederwalwalztemperatur the aluminum plate after a rolling break such that the temperature of the aluminum plate after the last pass match the target temperature.
  • a target temperature of the aluminum plate can be achieved in the last pass. This makes it possible to set advantageous material properties of the aluminum already at the end of the rolling process without expensive finishing.
  • a further embodiment of the invention provides that the characteristic data contain a cooling temperature, and that the aluminum plate is fed after the last rolling pass a cooling unit and cooled by the cooling unit to the cooling temperature.
  • the characteristics preferably also include a cooling rate, and the aluminum plate is cooled to the cooling temperature at the cooling rate after the last rolling pass by means of the cooling unit.
  • a particularly preferred embodiment of the invention provides that at least one rolling pass of another aluminum plate is carried out during at least one rolling break.
  • This is for example one off EP 2 111 309 B1 Known method used for rolling several aluminum plates.
  • rolling breaks can be used advantageously for processing further aluminum plates, so that the utilization of a rolling train can be optimized.
  • a further embodiment of the invention provides that a rolling force threshold value is predetermined as a function of at least one state variable of the aluminum plate, and that the pass schedule restricts the rolling force during rolling to the respective rolling force threshold depending on the values of the at least one state variable.
  • a thickness decrease threshold is set as a function of at least one state variable of the aluminum plate, and the stitch plan reduces the decrease in thickness of the aluminum plate during each roll pass depending on the values of the at least one state variable to the respective thickness decrease threshold.
  • a thickness of the aluminum plate is preferably used.
  • other geometric variables e.g. a curvature or profile of the aluminum plate, or thermodynamic variables, e.g. a temperature of the aluminum plate.
  • the material properties of the aluminum can be further improved and in particular an undesired grain growth in the aluminum plate can be counteracted.
  • a further embodiment of the invention provides that the aluminum plate is cooled by a cooling unit during at least one rolling break.
  • cooling units for cooling the aluminum plate is advantageous because aluminum plates are usually rolled at relatively low temperatures and therefore passive cooling of the aluminum plates would cost too much time.
  • a further embodiment of the invention provides that measured values of at least one measured variable associated with a temperature of the aluminum plate are continuously recorded and the values of the at least one state variable are determined on the basis of the detected measured values by means of a temperature model evaluating these measured values.
  • a temperature model evaluating these measured values.
  • Such methods for determining a current temperature of the aluminum plate using a temperature model are particularly advantageous because a sufficiently accurate direct measurement of a temperature of aluminum plates is usually difficult or too expensive and therefore the use of a model for temperature determination is useful.
  • a further embodiment of the invention provides that the stitch plan is continuously updated, for example, after each pass of the aluminum plate by a cooling unit.
  • measured values 1 of at least one measured variable associated with a temperature of the aluminum plate are recorded.
  • Such measured variables are in particular temperatures at different locations of the aluminum plate and for the aluminum plate characteristic variables such as a microstructure.
  • a current temperature of the aluminum plate is determined on the basis of the detected measured values 1 by means of a temperature model 2 of the aluminum plate evaluating these measured values 1, as is apparent from FIG WO 2008/043684 is known.
  • a pass schedule 5 for the rolling process is determined, which also includes actuators 6 required to achieve the characteristics 4.
  • actuators 6 include a cooling time in air cooling the aluminum plate, a number of rolling passes, a flow rate the aluminum plate through a rolling mill and / or amounts of water of a cooling unit.
  • the aluminum plate is rolled during each rolling pass up to a respective rolling pass associated waiting thickness. Subsequently, the rolling of the aluminum plate is interrupted by a rolling break until it has cooled to a rolling break associated Wiederanwalztemperatur the following roll pass.
  • the aluminum plate can be cooled passively or actively by means of a cooling unit.
  • the waiting thicknesses and re-rolling temperatures depend on the material and the target geometry of the aluminum plate. These quantities are sometimes derivable from phase diagrams, for example in the case of aluminum plates of aluminum-copper or aluminum-magnesium alloys, but are generally determined empirically.
  • the re-rolling temperature of the last rolling pass is determined from the temperature model 2 such that the temperature of the aluminum plate after the last rolling step coincides with the target temperature.
  • the target temperature may e.g. be characterized by an average over the thickness of the aluminum plate temperature, a surface temperature or by an enthalpy.
  • the aluminum plate is fed to a cooling unit and cooled by means of the cooling unit at the cooling rate to the cooling temperature.
  • the stitch plan takes into account, in addition to the characteristic data 4 for the thermal guidance of the rolling process, also further characteristic data, e.g. a maximum rolling force acting on the aluminum plate and / or a maximum thickness decrease of the aluminum plate during the individual rolling passes.
  • the pass schedule is cyclical, For example, after each passage of the aluminum plate through a cooling unit, updated on the basis of the determined instantaneous temperature, in particular, the actuators 6 are updated for further cooling.
  • the target variables in particular a target thickness and the target temperature of the aluminum plate.
  • At least one further aluminum plate is pre-rolled during the cooling of the aluminum plate in a rolling break. That's what it's made of EP 2 111 309 B1 Known method used for staggered rolling multiple aluminum plates.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Control Of Metal Rolling (AREA)
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Description

Die Erfindung betrifft ein Verfahren zum reversierenden thermomechanischen Walzen einer Aluminiumplatte in einem Walzprozess mit mehreren Walzstichen.The invention relates to a method for reversely thermomechanical rolling of an aluminum plate in a rolling process with several rolling passes.

Es sind verschiedene Verfahren zum reversierenden thermomechanischen Walzen bekannt. WO 2008/043684 offenbart beispielsweise ein Verfahren zur Nachverfolgung des physikalischen Zustands eines Warmblechs oder Warmbands im Rahmen der Steuerung einer Walzstrasse zur reversierenden Bearbeitung eines Warmblechs oder Warmbands. Dabei wird zu einem Startpunkt ein initialer Zustand des Warmblechs oder Warmbands, aus dem wenigstens eine physikalische Zustandsgröße ableitbar ist, in einem Modell bestimmt und der Zustand wird während der Bearbeitung des Warmblechs unter Verwendung des Modells zyklisch aktualisiert, wobei eine Wegverfolgung des Warmblechs oder Warmbands und den Zustand beeinflussende und/oder wiedergebende Betriebsparameter berücksichtigt werden.Various methods of reversible thermomechanical rolling are known. WO 2008/043684 discloses, for example, a method for tracking the physical condition of a hot plate or strip as part of the control of a rolling line for reversibly processing a hot plate or strip. In this case, an initial state of the hot plate or hot strip from which at least one physical state variable is derivable is determined in a model and the state is cyclically updated during the processing of the hot plate using the model, wherein a tracking of the hot plate or hot strip and the condition influencing and / or reproducing operating parameters are taken into account.

EP 2 111 309 B1 offenbart ein Verfahren zum thermomechanisch gesteuerten Walzen einer Charge von Metallbrammen zu Platten oder Bändern in einem Walzwerk mit wenigstens einem Walzgerüst nach einem Walzschema, das mindestens zwei Walzphasen umfasst und auf jede Bramme der Charge angewendet wird. Während des Walzens der Charge auf mindestens einem Walzgerüst kommt es mehrmals vor, dass auf eine Walzphase, die auf eine Bramme oder Platte oder ein Band angewendet wird, eine andere Walzphase folgt, die auf eine andere Bramme oder Platte oder ein anderes Band auf diesem Walzgerüst angewendet wird. Dabei ist für zwei aufeinanderfolgend gewalzte Brammen die Zeitspanne zwischen den Anfangszeitpunkten ihrer Walzphasen stets kleiner als die Summe der Zeitdauern aller Walzphasen und aller Abkühlphasen des Walzschemas. EP 1 958 711 A1 offenbart ein Verfahren zum thermomechanisch gesteuerten Walzen von Metallbrammen, bei dem jede Metallbramme während wenigstens zweier Walzphasen, die von einer Kühlphase unterbrochen werden, gewalzt wird und mehrere Metallbrammen gleichzeitig gewalzt werden. Der Oberbegriff von Anspruch 1 basiert auf dem Dokument EP 1 958 711 A1 . EP 2 111 309 B1 discloses a method for thermomechanically controlled rolling of a batch of metal slabs into sheets or strips in a rolling mill having at least one rolling stand according to a rolling scheme comprising at least two rolling phases and applied to each slab of the batch. During the rolling of the batch on at least one rolling stand, it happens several times that a rolling phase applied to a slab or plate or a strip is followed by another rolling phase which is on another slab or plate or another strip on this rolling stand is applied. In this case, for two successively rolled slabs, the time interval between the start times of their rolling phases is always smaller than the sum of the durations of all rolling phases and all cooling phases of the rolling scheme. EP 1 958 711 A1 discloses a method for thermomechanically controlled rolling of metal slabs in which each metal slab is rolled during at least two rolling phases interrupted by a cooling phase and a plurality of metal slabs are rolled simultaneously. The preamble of claim 1 is based on the document EP 1 958 711 A1 ,

EP 2 305 392 A1 offenbart ein Verfahren zum Walzen von Walzgut, bei dem der Walzprozess eine Kühlphase zwischen zwei Warmwalzumformungen umfasst. Während der Kühlphase wird einer Temperaturdifferenz zwischen einem Mittenbereich und einem Kantenbereich des Walzguts durch Heizen des Kantenbereichs entgegengewirkt. EP 2 305 392 A1 discloses a method of rolling rolling in which the rolling process comprises a cooling phase between two hot rolling transformations. During the cooling phase, a temperature difference between a central region and an edge region of the rolling stock is counteracted by heating the edge region.

Der Erfindung liegt die Aufgabe zugrunde, ein verbessertes Verfahren zum reversierenden thermomechanischen Walzen einer Aluminiumplatte anzugeben.The invention has for its object to provide an improved method for reversing thermomechanical rolling an aluminum plate.

Die Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.The object is achieved by the features of claim 1.

Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Advantageous embodiments of the invention are the subject of the dependent claims.

Bei dem erfindungsgemäßen Verfahren zum reversierenden thermomechanischen Walzen einer Aluminiumplatte in einem Walzprozess mit mehreren Walzstichen werden Kenndaten zur thermischen Führung des Walzprozesses vorgegeben und es werden laufend Werte wenigstens einer Zustandsgröße, aus der eine Temperatur der Aluminiumplatte ableitbar ist, ermittelt. In Abhängigkeit von den ermittelten Werten der wenigstens einen Zustandsgröße und den Kenndaten wird ein Stichplan für den Walzprozess ermittelt, der zwischen wenigstens zwei aufeinander folgenden Walzstichen eine Walzpause vorsieht, während derer das Walzen der Aluminiumplatte zu dessen Abkühlung unterbrochen wird. Dabei ordnen die Kenndaten wenigstens einem Walzstich eine Wartedicke der Aluminiumplatte zu, und der Stichplan sieht den Beginn einer Walzpause vor, sobald die Dicke der Aluminiumplatte in diesem Walzstich die ihm zugeordnete Wartedicke erreicht oder unterschreitet.In the method according to the invention for the reversing thermo-mechanical rolling of an aluminum plate in a rolling process with a plurality of rolling passes, characteristic data for the thermal guidance of the rolling process are specified and values of at least one state variable, from which a temperature of the aluminum plate can be derived, are continuously determined. Depending on the determined values of the at least one state variable and the characteristic data, a pass schedule for the rolling process is determined, which provides a rolling break between at least two consecutive rolling passes during which the rolling of the aluminum plate is interrupted for its cooling. At the same time, the characteristics associate at least one rolling pass with a waiting thickness of the aluminum plate, and the pass plan provides for the beginning of a rolling break as soon as the Thickness of the aluminum plate in this rolling pass reaches or falls below his assigned waiting thickness.

Unter einer Aluminiumplatte wird in dieser Anmeldung eine Platte verstanden, die aus Aluminium oder einer Aluminiumlegierung besteht.An aluminum plate is understood in this application to mean a plate which consists of aluminum or an aluminum alloy.

Als Zustandsgröße wird vorzugsweise eine über eine Dicke der Aluminiumplatte gemittelte Temperatur oder eine Oberflächentemperatur oder eine Restverfestigung oder Phasenanteile oder Korngrößen oder eine Enthalpie der Aluminiumplatte ermittelt.As the state quantity, a temperature averaged over a thickness of the aluminum plate or a surface temperature or a residual solidification or phase portions or grain sizes or an enthalpy of the aluminum plate is preferably determined.

Bei dem erfindungsgemäßen Verfahren wird eine Aluminiumplatte also temperaturgeführt gewalzt. Dadurch kann die Temperatur der Aluminiumplatte während des Walzprozesses kontrolliert und gesteuert werden. Die Steuerung der Temperatur erfolgt dabei mittels Walzpausen, in denen die Aluminiumplatte abgekühlt wird. Dies ist vorteilhaft, da die Walztemperatur bekanntermaßen Materialeigenschaften von Aluminiumplatten wesentlich beeinflusst. Insbesondere kann die Temperatur der Aluminiumplatte während des Walzprozesses derart gesteuert werden, dass dem Walzen nachfolgende aus dem Stand der Technik bekannte Nachbearbeitungsschritte zur thermischen Erzeugung bestimmter mechanischer Eigenschaften des Materials der Aluminiumplatte überflüssig werden. Derartige Fertigungsschritte sind beispielsweise Lösungsglühen, Abschrecken oder Aushärten des Aluminiums.In the method according to the invention an aluminum plate is thus rolled temperature-controlled. Thereby, the temperature of the aluminum plate can be controlled and controlled during the rolling process. The control of the temperature takes place by means of rolling breaks, in which the aluminum plate is cooled. This is advantageous because the rolling temperature is known to significantly affect material properties of aluminum plates. In particular, the temperature of the aluminum plate during the rolling process can be controlled such that subsequent finishing steps known in the art for thermally generating certain mechanical properties of the aluminum plate material become superfluous to the rolling. Such manufacturing steps are, for example, solution heat treatment, quenching or curing of the aluminum.

Ferner wird das Einlegen von Walzpausen an das Erreichen vorgegebener Dicken der Aluminiumplatte gekoppelt. Dadurch kann vorteilhaft ein gestuftes Walzen der Aluminiumplatte erreicht werden, bei dem das Walzen zur Abkühlung des Aluminiums kontrolliert durch Walzpausen in Abhängigkeit von Temperatur und Dicke der Aluminiumplatte unterbrochen wird.Further, the insertion of rolling pauses is coupled to the reaching of predetermined thicknesses of the aluminum plate. As a result, a stepped rolling of the aluminum plate can advantageously be achieved, in which the rolling to cool the aluminum is interrupted by rolling breaks as a function of temperature and thickness of the aluminum plate.

Die Erfindung sieht ferner vor, dass die Kenndaten wenigstens einer Walzpause eine Wiederanwalztemperatur der Aluminiumplatte zuordnen, und dass der Stichplan das Beenden dieser Walzpause vorsieht, sobald die Temperatur der Aluminiumplatte die Wiederanwalztemperatur erreicht.The invention further provides that the characteristics of at least one rolling break assign a Wiederanwalztemperatur the aluminum plate, and that the stitch plan to stop this Roll break provides as soon as the temperature of the aluminum plate reaches the Wiederwalwalztemperatur.

Auf diese Weise wird erreicht, dass die Aluminiumplatte während einer Walzpause auf eine definierte Temperatur abkühlt, nämlich auf die ihr zugeordnete Wiederanwalztemperatur. Dadurch wird die Kontrolle und Steuerung der Temperatur der Aluminiumplatte während des Walzprozesses vorteilhaft verbessert.In this way, it is achieved that the aluminum plate cools during a rolling break to a defined temperature, namely the assigned to it Wiederanwalztemperatur. This advantageously improves the control and control of the temperature of the aluminum plate during the rolling process.

Eine Ausgestaltung der Erfindung sieht vor, dass die Kenndaten eine Zieltemperatur enthalten, und dass der Stichplan eine Dauer einer Walzpause oder eine Wiederanwalztemperatur der Aluminiumplatte nach einer Walzpause derart bestimmt, dass die Temperatur der Aluminiumplatte nach dem letzten Walzstich mit der Zieltemperatur übereinstimmt.
Dadurch kann in dem letzten Walzstich neben einer definierten Enddicke auch eine Zieltemperatur der Aluminiumplatte erreicht werden. Dies ermöglicht es, vorteilhafte Materialeigenschaften des Aluminiums bereits am Ende des Walzprozesses ohne eine aufwändige Nachbearbeitung einzustellen. Außerdem kann durch die Zieltemperatur bei geeigneter Stichplanstrategie einem ungewollten Kornwachstum in der Aluminiumplatte entgegenwirkt werden, das sich bei herkömmlichen Verfahren in einer dem Walzprozess folgenden Wärmebehandlung einstellen kann.An embodiment of the invention provides that the characteristics include a target temperature, and that the stitch plan determines a duration of a rolling break or a Wiederwalwalztemperatur the aluminum plate after a rolling break such that the temperature of the aluminum plate after the last pass match the target temperature.
As a result, in addition to a defined final thickness, a target temperature of the aluminum plate can be achieved in the last pass. This makes it possible to set advantageous material properties of the aluminum already at the end of the rolling process without expensive finishing. In addition, can be counteracted by the target temperature at a suitable stitching strategy unwanted grain growth in the aluminum plate, which can adjust in conventional processes in a rolling process following the heat treatment.

Eine weitere Ausgestaltung der Erfindung sieht vor, dass die Kenndaten eine Kühltemperatur enthalten, und dass die Aluminiumplatte nach dem letzten Walzstich einem Kühlaggregat zugeführt und mittels des Kühlaggregats auf die Kühltemperatur abgekühlt wird. Dabei enthalten die Kenndaten vorzugsweise auch eine Kühlrate und die Aluminiumplatte wird nach dem letzten Walzstich mittels des Kühlaggregats bei der Kühlrate auf die Kühltemperatur abgekühlt.A further embodiment of the invention provides that the characteristic data contain a cooling temperature, and that the aluminum plate is fed after the last rolling pass a cooling unit and cooled by the cooling unit to the cooling temperature. The characteristics preferably also include a cooling rate, and the aluminum plate is cooled to the cooling temperature at the cooling rate after the last rolling pass by means of the cooling unit.

Dies ermöglicht vorteilhaft, die Materialeigenschaften des Aluminiums nach dem Walzprozess durch eine kontrollierte Abkühlung weiter zu verbessern.This advantageously makes it possible to further improve the material properties of the aluminum after the rolling process by controlled cooling.

Eine besonders bevorzugte Ausgestaltung der Erfindung sieht vor, dass während wenigstens einer Walzpause wenigstens ein Walzstich einer anderen Aluminiumplatte durchgeführt wird. Dazu wird beispielsweise ein aus EP 2 111 309 B1 bekanntes Verfahren zum Walzen mehrerer Aluminiumplatten angewendet.A particularly preferred embodiment of the invention provides that at least one rolling pass of another aluminum plate is carried out during at least one rolling break. This is for example one off EP 2 111 309 B1 Known method used for rolling several aluminum plates.

Dadurch können Walzpausen vorteilhaft zur Bearbeitung weiterer Aluminiumplatten genutzt werden, so dass die Auslastung einer Walzstraße optimiert werden kann.As a result, rolling breaks can be used advantageously for processing further aluminum plates, so that the utilization of a rolling train can be optimized.

Eine weitere Ausgestaltung der Erfindung sieht vor, dass ein Walzkraftschwellenwert als Funktion wenigstens einer Zustandsvariable der Aluminiumplatte vorgegeben wird, und dass der Stichplan die Walzkraft während des Walzens in Abhängigkeit von den Werten der wenigstens einen Zustandsvariable auf den jeweiligen Walzkraftschwellenwert beschränkt. Alternativ oder zusätzlich wird ein Dickeabnahmeschwellenwert als Funktion wenigstens einer Zustandsvariable der Aluminiumplatte vorgegeben und durch den Stichplan wird die Abnahme einer Dicke der Aluminiumplatte während jedes Walzstiches in Abhängigkeit von den Werten der wenigstens einen Zustandsvariable auf den jeweiligen Dickeabnahmeschwellenwert beschränkt.A further embodiment of the invention provides that a rolling force threshold value is predetermined as a function of at least one state variable of the aluminum plate, and that the pass schedule restricts the rolling force during rolling to the respective rolling force threshold depending on the values of the at least one state variable. Alternatively or additionally, a thickness decrease threshold is set as a function of at least one state variable of the aluminum plate, and the stitch plan reduces the decrease in thickness of the aluminum plate during each roll pass depending on the values of the at least one state variable to the respective thickness decrease threshold.

Als eine Zustandsvariable wird dabei vorzugsweise eine Dicke der Aluminiumplatte verwendet. Alternativ oder zusätzlich eignen sich als Zustandsvariable andere geometrische Variablen, z.B. eine Krümmung oder ein Profil der Aluminiumplatte, oder thermodynamische Variablen, z.B. eine Temperatur der Aluminiumplatte.As a state variable, a thickness of the aluminum plate is preferably used. Alternatively or additionally, other geometric variables, e.g. a curvature or profile of the aluminum plate, or thermodynamic variables, e.g. a temperature of the aluminum plate.

Dadurch können die Materialeigenschaften des Aluminiums weiter verbessert werden und insbesondere einem ungewollten Kornwachstum in der Aluminiumplatte entgegengewirkt werden.As a result, the material properties of the aluminum can be further improved and in particular an undesired grain growth in the aluminum plate can be counteracted.

Eine weitere Ausgestaltung der Erfindung sieht vor, dass die Aluminiumplatte während wenigstens einer Walzpause durch ein Kühlaggregat gekühlt wird.A further embodiment of the invention provides that the aluminum plate is cooled by a cooling unit during at least one rolling break.

Die Verwendung von Kühlaggregaten zum Abkühlen der Aluminiumplatte ist vorteilhaft, da Aluminiumplatten in der Regel bei relativ niedrigen Temperaturen gewalzt werden und eine passive Kühlung der Aluminiumplatten daher zuviel Zeit kosten würde.The use of cooling units for cooling the aluminum plate is advantageous because aluminum plates are usually rolled at relatively low temperatures and therefore passive cooling of the aluminum plates would cost too much time.

Eine weitere Ausgestaltung der Erfindung sieht vor, dass laufend Messwerte wenigstens einer mit einer Temperatur der Aluminiumplatte zusammenhängenden Messgröße erfasst werden und die Werte der wenigstens einen Zustandsgröße anhand der erfassten Messwerte mittels eines diese Messwerte auswertenden Temperaturmodells ermittelt werden. Zur Ermittelung einer momentanen Temperatur der Aluminiumplatte eignet sich insbesondere ein aus WO 2008/043684 bekanntes Verfahren zur Nachverfolgung des physikalischen Zustands der Aluminiumplatte.A further embodiment of the invention provides that measured values of at least one measured variable associated with a temperature of the aluminum plate are continuously recorded and the values of the at least one state variable are determined on the basis of the detected measured values by means of a temperature model evaluating these measured values. For determining a current temperature of the aluminum plate is particularly suitable WO 2008/043684 Known method for tracking the physical state of the aluminum plate.

Derartige Methoden zur Ermittelung einer momentanen Temperatur der Aluminiumplatte anhand eines Temperaturmodells sind insbesondere deshalb vorteilhaft, weil eine hinreichend genaue direkte Messung einer Temperatur von Aluminiumplatten in der Regel schwierig bzw. zu aufwändig ist und deshalb die Heranziehung eines Modells zur Temperaturermittelung nützlich ist.Such methods for determining a current temperature of the aluminum plate using a temperature model are particularly advantageous because a sufficiently accurate direct measurement of a temperature of aluminum plates is usually difficult or too expensive and therefore the use of a model for temperature determination is useful.

Eine weitere Ausgestaltung der Erfindung sieht vor, dass der Stichplan laufend, beispielsweise nach jedem Durchlauf der Aluminiumplatte durch ein Kühlaggregat, aktualisiert wird.A further embodiment of the invention provides that the stitch plan is continuously updated, for example, after each pass of the aluminum plate by a cooling unit.

Eine derartige Aktualisierung ermöglicht es vorteilhaft, bei Abweichungen von Ist-Daten von Plan-Daten korrigierend einzugreifen und den Stichplan den aktuellen Bedingungen anzupassen.Such an update advantageously makes it possible to intervene in the event of deviations from actual data from plan data and to adapt the pass schedule to the current conditions.

Die oben beschriebenen Eigenschaften, Merkmale und Vorteile dieser Erfindung sowie die Art und Weise, wie diese erreicht werden, werden klarer und deutlicher verständlich im Zusammenhang mit der folgenden Beschreibung von Ausführungsbeispielen, die im Zusammenhang mit einer Zeichnung näher erläutert werden.The above-described characteristics, features, and advantages of this invention, as well as the manner in which they will be achieved, will become clearer and more clearly understood in connection with the following description of exemplary embodiments, which will be described in connection with a drawing.

Die Figur zeigt ein Ablaufdiagramm eines mittels eines Automatisierungssystems durchgeführten Verfahrens zum reversierenden thermomechanischen Walzen einer Aluminiumplatte zu einem Aluminiumblech in einem Walzprozess mit mehreren Walzstichen.The figure shows a flow chart of a method performed by an automation system for reversely thermo-mechanical rolling of an aluminum plate to an aluminum sheet in a rolling process with multiple rolling passes.

Bei dem Verfahren werden Messwerte 1 wenigstens einer mit einer Temperatur der Aluminiumplatte zusammenhängenden Messgröße erfasst. Derartige Messgrößen sind insbesondere Temperaturen an verschiedenen Orten der Aluminiumplatte und für die Aluminiumplatte charakteristische Größen wie eine Gefügestruktur.In the method, measured values 1 of at least one measured variable associated with a temperature of the aluminum plate are recorded. Such measured variables are in particular temperatures at different locations of the aluminum plate and for the aluminum plate characteristic variables such as a microstructure.

Als Zustandsgröße 3 der Aluminiumplatte wird eine momentane Temperatur der Aluminiumplatte anhand der erfassten Messwerte 1 mittels eines diese Messwerte 1 auswertenden Temperaturmodells 2 der Aluminiumplatte ermittelt, wie es aus WO 2008/043684 bekannt ist.As a state variable 3 of the aluminum plate, a current temperature of the aluminum plate is determined on the basis of the detected measured values 1 by means of a temperature model 2 of the aluminum plate evaluating these measured values 1, as is apparent from FIG WO 2008/043684 is known.

Ferner werden Kenndaten 4 zur thermischen Führung des Walzprozesses vorgegeben und in dem Automatisierungssystem hinterlegt. Diese Kenndaten umfassen insbesondere Wartedicken, Wiederanwalztemperaturen, eine Zieltemperatur, eine Kühltemperatur und eine Kühlrate.Furthermore, characteristic data 4 are predetermined for the thermal guidance of the rolling process and stored in the automation system. These characteristics include, in particular, waiting thicknesses, re-rolling temperatures, a target temperature, a cooling temperature, and a cooling rate.

Anhand der ermittelten momentanen Temperatur der Aluminiumplatte und den Kenndaten 4 wird ein Stichplan 5 für den Walzprozess ermittelt, der auch zur Erreichung der Kenndaten 4 benötigte Stellglieder 6 umfasst. Solche Stellglieder 6 umfassen eine Abkühlzeit bei Luftkühlung der Aluminiumplatte, eine Anzahl von Walzstichen, eine Durchlaufgeschwindigkeit der Aluminiumplatte durch ein Walzgerüst und/oder Wassermengen eines Kühlaggregates.On the basis of the determined instantaneous temperature of the aluminum plate and the characteristic data 4, a pass schedule 5 for the rolling process is determined, which also includes actuators 6 required to achieve the characteristics 4. Such actuators 6 include a cooling time in air cooling the aluminum plate, a number of rolling passes, a flow rate the aluminum plate through a rolling mill and / or amounts of water of a cooling unit.

Anhand des Stichplanes 5 wird die Aluminiumplatte während jedes Walzstiches bis zu einer dem jeweiligen Walzstich zugeordneten Wartedicke gewalzt. Anschließend wird das Walzen der Aluminiumplatte durch eine Walzpause unterbrochen, bis sie zu einer der Walzpause zugeordneten Wiederanwalztemperatur des folgenden Walzstiches abgekühlt ist. Dabei kann die Aluminiumplatte passiv oder aktiv mittels eines Kühlaggregates abgekühlt werden. Die Wartedicken und Wiederanwalztemperaturen hängen vom Material und der Zielgeometrie der Aluminiumplatte ab. Diese Größen sind mitunter aus Phasendiagrammen ableitbar, beispielsweise im Falle von Aluminiumplatten aus Aluminium-Kupfer- oder Aluminium-Magnesium-Legierungen, werden aber im Allgemeinen empirisch ermittelt.Using the stitch plan 5, the aluminum plate is rolled during each rolling pass up to a respective rolling pass associated waiting thickness. Subsequently, the rolling of the aluminum plate is interrupted by a rolling break until it has cooled to a rolling break associated Wiederanwalztemperatur the following roll pass. The aluminum plate can be cooled passively or actively by means of a cooling unit. The waiting thicknesses and re-rolling temperatures depend on the material and the target geometry of the aluminum plate. These quantities are sometimes derivable from phase diagrams, for example in the case of aluminum plates of aluminum-copper or aluminum-magnesium alloys, but are generally determined empirically.

Die Wiederanwalztemperatur des letzten Walzstiches wird anhand des Temperaturmodells 2 derart bestimmt, dass die Temperatur der Aluminiumplatte nach dem letzten Walzschritt mit der Zieltemperatur übereinstimmt. Die Zieltemperatur kann z.B. durch eine über die Dicke der Aluminiumplatte gemittelte Temperatur, eine Oberflächentemperatur oder durch eine Enthalpie charakterisiert werden.The re-rolling temperature of the last rolling pass is determined from the temperature model 2 such that the temperature of the aluminum plate after the last rolling step coincides with the target temperature. The target temperature may e.g. be characterized by an average over the thickness of the aluminum plate temperature, a surface temperature or by an enthalpy.

Nach dem letzten Walzstich wird die Aluminiumplatte einem Kühlaggregat zugeführt und mittels des Kühlaggregats bei der Kühlrate auf die Kühltemperatur abgekühlt.After the last pass, the aluminum plate is fed to a cooling unit and cooled by means of the cooling unit at the cooling rate to the cooling temperature.

In einer Ausgestaltung des Ausführungsbeispiels berücksichtigt der Stichplan neben den Kenndaten 4 zur thermischen Führung des Walzprozesses auch weitere Kenndaten, z.B. eine maximale auf die Aluminiumplatte wirkende Walzkraft und/oder eine maximale Dickeabnahme der Aluminiumplatte während der einzelnen Walzstiche.In an embodiment of the exemplary embodiment, the stitch plan takes into account, in addition to the characteristic data 4 for the thermal guidance of the rolling process, also further characteristic data, e.g. a maximum rolling force acting on the aluminum plate and / or a maximum thickness decrease of the aluminum plate during the individual rolling passes.

In einer weiteren, alternativen oder zusätzlichen Ausgestaltung des Ausführungsbeispiels wird der Stichplan zyklisch, z.B. nach jedem Durchlauf der Aluminiumplatte durch ein Kühlaggregat, anhand der ermittelten momentanen Temperatur aktualisiert, wobei insbesondere auch die Stellglieder 6 für das weitere Kühlen aktualisiert werden. Insbesondere kann so bei einer Abweichung der Ist-Daten von den Plan-Daten immer wieder korrigierend eingegriffen werden, um die Zielgrößen (insbesondere eine Zieldicke und die Zieltemperatur der Aluminiumplatte) zu erreichen.In a further, alternative or additional embodiment of the embodiment, the pass schedule is cyclical, For example, after each passage of the aluminum plate through a cooling unit, updated on the basis of the determined instantaneous temperature, in particular, the actuators 6 are updated for further cooling. In particular, in the case of a deviation of the actual data from the plan data, corrective action can always be taken to achieve the target variables (in particular a target thickness and the target temperature of the aluminum plate).

In einer weiteren, alternativen oder zusätzlichen Ausgestaltung des Ausführungsbeispiels wird während der Abkühlung der Aluminiumplatte in einer Walzpause mindestens eine weitere Aluminiumplatte vorgewalzt. Dazu wird das aus EP 2 111 309 B1 bekannte Verfahren zum gestaffelten Walzen mehrerer Aluminiumplatten verwendet.In a further, alternative or additional embodiment of the embodiment, at least one further aluminum plate is pre-rolled during the cooling of the aluminum plate in a rolling break. That's what it's made of EP 2 111 309 B1 Known method used for staggered rolling multiple aluminum plates.

Obwohl die Erfindung im Detail durch ein bevorzugtes Ausführungsbeispiel näher illustriert und beschrieben wurde, so ist die Erfindung nicht durch die offenbarten Beispiele eingeschränkt und andere Variationen können vom Fachmann hieraus abgeleitet werden, ohne den Schutzumfang der Erfindung zu verlassen.Although the invention has been further illustrated and described in detail by way of a preferred embodiment, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

Claims (12)

  1. Method for reversing thermomechanical rolling of an aluminium plate in a rolling process comprising a plurality of rolling passes, wherein
    - characteristic data (4) for thermally controlling the rolling process is specified,
    - a pass schedule (5) is determined for the rolling process, and
    - the pass schedule (5) makes provision for a rolling pause between at least two successive rolling passes, during which rolling pause the rolling of the aluminium plate is interrupted to allow the plate to cool down,
    characterised in that
    - values of at least one state variable (3) from which a temperature of the aluminium plate can be derived are determined continuously,
    - the pass schedule (5) for the rolling process is determined as a function of the determined values of the at least one state variable (3) and the characteristic data (4),
    - the characteristic data (4) assigns a waiting thickness of the aluminium plate to at least one rolling pass, and
    - the pass schedule makes provision for a rolling pause to start as soon as the thickness of the aluminium plate reaches or falls below its assigned waiting thickness in said rolling pass,
    - the characteristic data (4) assigns a rolling restart temperature of the aluminium plate to at least one rolling pause and the pass schedule makes provision for said rolling pause to terminate as soon as the temperature of the aluminium plate reaches the rolling restart temperature.
  2. Method according to claim 1,
    characterised in that the characteristic data (4) includes a target temperature, and in that the pass schedule determines a duration of a rolling pause or a rolling restart temperature of the aluminium plate after a rolling pause such that the temperature of the aluminium plate after the final rolling pass coincides with the target temperature.
  3. Method according to one of the preceding claims,
    characterised in that the determined state variable (3) is a temperature averaged over a thickness of the aluminium plate or a surface temperature or a residual hardening or phase fractions or grain sizes or an enthalpy of the aluminium plate.
  4. Method according to one of the preceding claims,
    characterised in that the characteristic data (4) includes a cooling temperature, and in that after the final rolling pass the aluminium plate is supplied to a cooling unit and cooled down to the cooling temperature by means of the cooling unit.
  5. Method according to claim 4,
    characterised in that the characteristic data (4) includes a cooling rate, and in that after the final rolling pass the aluminium plate is cooled down to the cooling temperature at the cooling rate by means of the cooling unit.
  6. Method according to one of the preceding claims,
    characterised in that at least one rolling pass of another aluminium plate is performed during at least one rolling pause.
  7. Method according to one of the preceding claims,
    characterised in that a rolling force threshold value is predefined as a function of at least one state variable of the aluminium plate, and in that the pass schedule limits the rolling force during the rolling operation to the respective rolling force threshold value as a function of the values of the at least one state variable.
  8. Method according to one of the preceding claims,
    characterised in that a thickness reduction threshold value is predefined as a function of at least one state variable of the aluminium plate, and in that the pass schedule limits the reduction of a thickness of the aluminium plate during each rolling pass to the respective thickness reduction threshold value as a function of the values of the at least one state variable.
  9. Method according to claim 7 or 8,
    characterised in that a thickness of the aluminium plate is used as a state variable.
  10. Method according to one of the preceding claims,
    characterised in that the aluminium plate is cooled by means of a cooling unit during at least one rolling pause.
  11. Method according to one of the preceding claims,
    characterised in that measured values (1) of at least one measurement variable associated with a temperature of the aluminium plate are acquired continuously and the values of the at least one state variable (3) are determined on the basis of the acquired measured values (1) by means of a temperature model (2) evaluating said measured values (1).
  12. Method according to one of the preceding claims,
    characterised in that the pass schedule (5) is constantly updated.
EP13719045.0A 2012-04-26 2013-04-17 Thermo-mechanical rolling of an aluminium panel Active EP2828011B1 (en)

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EP20120165758 EP2656932A1 (en) 2012-04-26 2012-04-26 Thermo-mechanical rolling of an aluminium panel
PCT/EP2013/057960 WO2013160162A1 (en) 2012-04-26 2013-04-17 Thermomechanical rolling of an aluminium plate
EP13719045.0A EP2828011B1 (en) 2012-04-26 2013-04-17 Thermo-mechanical rolling of an aluminium panel

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EP2656932A1 (en) 2012-04-26 2013-10-30 Siemens Aktiengesellschaft Thermo-mechanical rolling of an aluminium panel
FR3018213B1 (en) 2014-03-06 2016-10-21 Constellium France MULTI-PLASTER SOLDERING SHEET
FR3024058B1 (en) 2014-07-23 2016-07-15 Constellium France METHOD AND EQUIPMENT FOR COOLING
DE102014222827A1 (en) * 2014-11-07 2016-05-12 Sms Group Gmbh Method for controlling and / or regulating a metallurgical plant

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FR2529578B1 (en) * 1982-07-02 1986-04-11 Cegedur METHOD FOR IMPROVING BOTH FATIGUE RESISTANCE AND TENACITY OF HIGH RESISTANCE AL ALLOYS
JP3376195B2 (en) * 1995-12-26 2003-02-10 川崎製鉄株式会社 Method for producing high-strength thick steel sheet with excellent in-plate homogeneity and having both brittle crack propagation arrestability and weldability
JPH10192950A (en) * 1997-01-17 1998-07-28 Nkk Corp Heat treatment device of thick steel plate and production of thick steel plate
DE19758108C1 (en) * 1997-12-17 1999-01-14 Mannesmann Ag Method and installation for continuous production of hot rolled thin flat products
CA2607497C (en) * 2005-05-25 2014-08-26 Pizhi Zhao Aluminum alloy sheet and method for manufacturing the same
DE102006047718A1 (en) 2006-10-09 2008-04-17 Siemens Ag Method for tracking the physical condition of a hot plate or hot strip as part of the control of a plate rolling mill for processing a hot plate or hot strip
CN101631630A (en) * 2007-02-16 2010-01-20 西门子Vai金属科技有限公司 The hot mechanical controlled rolling method and the device of metallic plate and band
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US10131979B2 (en) 2018-11-20
US20150122375A1 (en) 2015-05-07
BR112014026380B1 (en) 2019-11-19
BR112014026380A2 (en) 2017-06-27
BR112014026380A8 (en) 2018-04-03
CN104245166B (en) 2016-11-02
CN104245166A (en) 2014-12-24
EP2828011A1 (en) 2015-01-28
WO2013160162A1 (en) 2013-10-31

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