EP2656932A1 - Thermo-mechanical rolling of an aluminium panel - Google Patents
Thermo-mechanical rolling of an aluminium panel Download PDFInfo
- Publication number
- EP2656932A1 EP2656932A1 EP20120165758 EP12165758A EP2656932A1 EP 2656932 A1 EP2656932 A1 EP 2656932A1 EP 20120165758 EP20120165758 EP 20120165758 EP 12165758 A EP12165758 A EP 12165758A EP 2656932 A1 EP2656932 A1 EP 2656932A1
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- European Patent Office
- Prior art keywords
- rolling
- aluminum plate
- temperature
- pass
- state variable
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- 238000005096 rolling process Methods 0.000 title claims abstract description 108
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 103
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 230000000930 thermomechanical effect Effects 0.000 title claims description 7
- 239000004411 aluminium Substances 0.000 title 1
- 238000001816 cooling Methods 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 29
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- WPPDFTBPZNZZRP-UHFFFAOYSA-N aluminum copper Chemical compound [Al].[Cu] WPPDFTBPZNZZRP-UHFFFAOYSA-N 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
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- 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 periods of all rolling phases and all cooling phases of the rolling scheme.
- 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.
- An aluminum plate is understood in this application to mean a plate which consists of aluminum or an aluminum alloy.
- a state variable is preferably a temperature averaged over a thickness of the aluminum plate or a surface temperature or a residual solidification or phase fractions or grain sizes or an enthalpy of the aluminum plate.
- 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 becomes.
- 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.
- a preferred embodiment of the invention provides that the characteristics associate at least one rolling pass a waiting thickness of the aluminum plate, and that the stitch 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 its waiting thickness assigned to it.
- a further embodiment of the invention provides that the characteristics of at least one rolling break assign a Wiederanwalztemperatur the aluminum plate, and that the pass schedule provides for the termination of this rolling break, once the temperature of the aluminum plate reaches the Bachanwalztemperatur.
- 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.
- a further embodiment of the invention provides that the characteristic data contain a target temperature, and that the stitching plan determines a duration of a rolling break or a recoil temperature of the aluminum plate after a rolling break in such a way that the temperature of the aluminum plate after the last pass matches 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.
- 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.
- the figure shows a flow chart of a method performed by an automation system for reversely thermo-mechanical rolling of an aluminum plate to a Aluminum sheet in a rolling process with several rolling passes.
- 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.
- 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.
- 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 of the aluminum plate through a rolling stand 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 passively or actively cooled by means of a cooling unit become.
- 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 embodiment of the stitch plan is cyclically updated, for example after each pass of the aluminum plate by a cooling unit, based on 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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- Crystallography & Structural Chemistry (AREA)
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Abstract
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.
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
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.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.
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 dabei 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.In this case, a state variable is preferably a temperature averaged over a thickness of the aluminum plate or a surface temperature or a residual solidification or phase fractions or grain sizes or an enthalpy of the aluminum plate.
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 becomes. 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.
Eine bevorzugte Ausgestaltung der Erfindung sieht vor, dass die Kenndaten wenigstens einem Walzstich eine Wartedicke der Aluminiumplatte zuordnen, und dass der Stichplan den Beginn einer Walzpause vorsieht, sobald die Dicke der Aluminiumplatte in diesem Walzstich die ihm zugeordnete Wartedicke erreicht oder unterschreitet.A preferred embodiment of the invention provides that the characteristics associate at least one rolling pass a waiting thickness of the aluminum plate, and that the stitch 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 its waiting thickness assigned to it.
Auf diese Weise 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 unterbrochen wird.In this way, the insertion of rolling breaks is coupled to the reaching of predetermined thicknesses of the aluminum plate. As a result, advantageously a stepped rolling of the aluminum plate can be achieved, in which the rolls for cooling the aluminum is controlled interrupted by rolling breaks.
Eine weitere Ausgestaltung der Erfindung sieht 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.A further embodiment of the invention provides that the characteristics of at least one rolling break assign a Wiederanwalztemperatur the aluminum plate, and that the pass schedule provides for the termination of this rolling break, once the temperature of the aluminum plate reaches the Wiederanwalztemperatur.
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 weitere 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.A further embodiment of the invention provides that the characteristic data contain a target temperature, and that the stitching plan determines a duration of a rolling break or a recoil temperature of the aluminum plate after a rolling break in such a way that the temperature of the aluminum plate after the last pass matches 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
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
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 a Aluminum sheet in a rolling process with several 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
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
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 of the aluminum plate through a rolling stand 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 passively or actively cooled by means of a cooling unit become. 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 of the stitch plan is cyclically updated, for example after each pass of the aluminum plate by a cooling unit, based on 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
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 (14)
dadurch gekennzeichnet, dass die Kenndaten (4) wenigstens einem Walzstich eine Wartedicke der Aluminiumplatte zuordnen, und dass der Stichplan den Beginn einer Walzpause vorsieht, sobald die Dicke der Aluminiumplatte in diesem Walzstich die ihm zugeordnete Wartedicke erreicht oder unterschreitet.Method according to claim 1,
characterized in that the characteristic data (4) assign a waiting thickness of the aluminum plate to at least one rolling pass, and that the pass schedule 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 the waiting thickness assigned to it.
dadurch gekennzeichnet, dass die Kenndaten (4) 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.Method according to one of the preceding claims,
characterized in that the characteristic data (4) at least one rolling break assign a Wiederanwalztemperatur the aluminum plate, and that the stitch plan provides for ending this rolling break as soon as the temperature of the aluminum plate reaches the Wiederanwalztemperatur.
dadurch gekennzeichnet, dass die Kenndaten (4) 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.Method according to claim 2,
characterized in that the characteristic data (4) include a target temperature, and that the pass schedule determines a duration of a rolling break or a rewinding temperature of the aluminum plate after a rolling break such that the temperature the aluminum plate after the last pass matches the target temperature.
dadurch gekennzeichnet, dass als Zustandsgröße (3) eine über eine Dicke der Aluminiumplatte gemittelte Temperatur oder eine Oberflächentemperatur oder eine Restverfestigung oder Phasenanteile oder Korngrößen oder eine Enthalpie der Aluminiumplatte ermittelt wird.Method according to one of the preceding claims,
characterized in that as state variable (3) a temperature averaged over a thickness of the aluminum plate or a surface temperature or a residual solidification or phase fractions or grain sizes or an enthalpy of the aluminum plate is determined.
dadurch gekennzeichnet, dass die Kenndaten (4) eine Kühltemperatur enthalten, und dass die Aluminiumplatte nach dem letzten Walzstich einem Kühlaggregat zugeführt wird und mittels des Kühlaggregats auf die Kühltemperatur abgekühlt wird.Method according to one of the preceding claims,
characterized in that the characteristic data (4) contain a cooling temperature, and that the aluminum plate is fed to a cooling unit after the last pass and is cooled by means of the cooling unit to the cooling temperature.
dadurch gekennzeichnet, dass die Kenndaten (4) eine Kühlrate enthalten, und dass die Aluminiumplatte nach dem letzten Walzstich mittels des Kühlaggregats bei der Kühlrate auf die Kühltemperatur abgekühlt wird.Method according to claim 6,
characterized in that the characteristic data (4) include a cooling rate, and that the aluminum plate is cooled after the last rolling pass by means of the cooling unit at the cooling rate to the cooling temperature.
dadurch gekennzeichnet, dass während wenigstens einer Walzpause wenigstens ein Walzstich einer anderen Aluminiumplatte durchgeführt wird.Method according to one of the preceding claims,
characterized in that during at least one rolling break at least one rolling pass of another aluminum plate is performed.
dadurch gekennzeichnet, 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.Method according to one of the preceding claims,
characterized in that a rolling force threshold is set 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.
dadurch gekennzeichnet, dass ein Dickeabnahmeschwellenwert als Funktion wenigstens einer Zustandsvariable der Aluminiumplatte vorgegeben wird, und dass der Stichplan die Abnahme einer Dicke der Aluminiumplatte während jedes Walzstiches in Abhängigkeit von den Werten der wenigstens einen Zustandsvariable auf den jeweiligen Dickeabnahmeschwellenwert beschränkt.Method according to one of the preceding claims,
characterized in that a thickness decrease threshold value as a function of at least one state variable of the aluminum plate and that the stitching schedule limits the decrease in a thickness of the aluminum plate during each pass according to the values of the at least one state variable to the respective thickness decrease threshold.
dadurch gekennzeichnet, dass als eine Zustandsvariable eine Dicke der Aluminiumplatte verwendet wird.Method according to claim 9 or 10,
characterized in that a thickness of the aluminum plate is used as a state variable.
dadurch gekennzeichnet, dass die Aluminiumplatte während wenigstens einer Walzpause durch ein Kühlaggregat gekühlt wird.Method according to one of the preceding claims,
characterized in that the aluminum plate is cooled during at least one rolling break by a cooling unit.
dadurch gekennzeichnet, dass laufend Messwerte (1) wenigstens einer mit einer Temperatur der Aluminiumplatte zusammenhängenden Messgröße erfasst werden und die Werte der wenigstens einen Zustandsgröße (3) anhand der erfassten Messwerte (1) mittels eines diese Messwerte (1) auswertenden Temperaturmodells (2) ermittelt werden.Method according to one of the preceding claims,
characterized in that measured values (1) 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 (3) are determined on the basis of the detected measured values (1) by means of a temperature model (2) evaluating these measured values (1) become.
dadurch gekennzeichnet, dass der Stichplan (5) laufend aktualisiert wird.Method according to one of the preceding claims,
characterized in that the pass schedule (5) is updated continuously.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20120165758 EP2656932A1 (en) | 2012-04-26 | 2012-04-26 | Thermo-mechanical rolling of an aluminium panel |
| BR112014026380-9A BR112014026380B1 (en) | 2012-04-26 | 2013-04-17 | method for reversible thermomechanical rolling of an aluminum plate in a rolling process with a plurality of rolling passes |
| US14/397,084 US10131979B2 (en) | 2012-04-26 | 2013-04-17 | Thermomechanical rolling of an aluminum plate |
| EP13719045.0A EP2828011B1 (en) | 2012-04-26 | 2013-04-17 | Thermo-mechanical rolling of an aluminium panel |
| CN201380020354.6A CN104245166B (en) | 2012-04-26 | 2013-04-17 | The thermo-mechanical rolling of aluminium sheet |
| PCT/EP2013/057960 WO2013160162A1 (en) | 2012-04-26 | 2013-04-17 | Thermomechanical rolling of an aluminium plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20120165758 EP2656932A1 (en) | 2012-04-26 | 2012-04-26 | Thermo-mechanical rolling of an aluminium panel |
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| EP2656932A1 true EP2656932A1 (en) | 2013-10-30 |
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| EP20120165758 Withdrawn EP2656932A1 (en) | 2012-04-26 | 2012-04-26 | Thermo-mechanical rolling of an aluminium panel |
| EP13719045.0A Active EP2828011B1 (en) | 2012-04-26 | 2013-04-17 | Thermo-mechanical rolling of an aluminium panel |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13719045.0A Active EP2828011B1 (en) | 2012-04-26 | 2013-04-17 | Thermo-mechanical rolling of an aluminium panel |
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| US (1) | US10131979B2 (en) |
| EP (2) | EP2656932A1 (en) |
| CN (1) | CN104245166B (en) |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016012691A1 (en) * | 2014-07-23 | 2016-01-28 | Constellium Neuf-Brisach | Cooling facility and method |
| US10006724B2 (en) | 2014-03-06 | 2018-06-26 | Constellium Neuf-Brisach | Multiply-clad brazing metal sheet |
| US10131979B2 (en) | 2012-04-26 | 2018-11-20 | Primetals Technologies Germany Gmbh | Thermomechanical rolling of an aluminum plate |
| EP3215643B1 (en) * | 2014-11-07 | 2021-04-07 | SMS group GmbH | Method for controlling a metallurgical plant in an open-loop and/or closed-loop manner |
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| EP2305392A1 (en) * | 2009-10-05 | 2011-04-06 | Siemens Aktiengesellschaft | Method for rolling rolled goods and rolling mill train with at least one roller frame for thermomechanical milling of rolled goods |
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| 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 |
| WO2006126281A1 (en) * | 2005-05-25 | 2006-11-30 | Nippon Light Metal Co., Ltd. | Aluminum alloy sheet and method for manufacturing the same |
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- 2012-04-26 EP EP20120165758 patent/EP2656932A1/en not_active Withdrawn
-
2013
- 2013-04-17 CN CN201380020354.6A patent/CN104245166B/en active Active
- 2013-04-17 EP EP13719045.0A patent/EP2828011B1/en active Active
- 2013-04-17 WO PCT/EP2013/057960 patent/WO2013160162A1/en active Application Filing
- 2013-04-17 US US14/397,084 patent/US10131979B2/en active Active
- 2013-04-17 BR BR112014026380-9A patent/BR112014026380B1/en active IP Right Grant
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| EP1958711A1 (en) * | 2007-02-16 | 2008-08-20 | Siemens VAI Metals Technologies Ltd. | Method and apparatus for thermo-mechanical controlled rolling of metal plates and strips |
| EP2305392A1 (en) * | 2009-10-05 | 2011-04-06 | Siemens Aktiengesellschaft | Method for rolling rolled goods and rolling mill train with at least one roller frame for thermomechanical milling of rolled goods |
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| US10131979B2 (en) | 2012-04-26 | 2018-11-20 | Primetals Technologies Germany Gmbh | Thermomechanical rolling of an aluminum plate |
| US10006724B2 (en) | 2014-03-06 | 2018-06-26 | Constellium Neuf-Brisach | Multiply-clad brazing metal sheet |
| WO2016012691A1 (en) * | 2014-07-23 | 2016-01-28 | Constellium Neuf-Brisach | Cooling facility and method |
| FR3024058A1 (en) * | 2014-07-23 | 2016-01-29 | Constellium France | METHOD AND EQUIPMENT FOR COOLING |
| EP3398696A1 (en) * | 2014-07-23 | 2018-11-07 | Constellium Neuf Brisach | Cooling facility and method |
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| EP3215643B1 (en) * | 2014-11-07 | 2021-04-07 | SMS group GmbH | Method for controlling a metallurgical plant in an open-loop and/or closed-loop manner |
Also Published As
| Publication number | Publication date |
|---|---|
| BR112014026380A2 (en) | 2017-06-27 |
| US20150122375A1 (en) | 2015-05-07 |
| CN104245166A (en) | 2014-12-24 |
| WO2013160162A1 (en) | 2013-10-31 |
| BR112014026380B1 (en) | 2019-11-19 |
| EP2828011A1 (en) | 2015-01-28 |
| BR112014026380A8 (en) | 2018-04-03 |
| US10131979B2 (en) | 2018-11-20 |
| CN104245166B (en) | 2016-11-02 |
| EP2828011B1 (en) | 2017-08-09 |
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