EP0949348A1 - Process for controlled cooling of aluminium alloy strips and profiles - Google Patents

Process for controlled cooling of aluminium alloy strips and profiles Download PDF

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Publication number
EP0949348A1
EP0949348A1 EP98810309A EP98810309A EP0949348A1 EP 0949348 A1 EP0949348 A1 EP 0949348A1 EP 98810309 A EP98810309 A EP 98810309A EP 98810309 A EP98810309 A EP 98810309A EP 0949348 A1 EP0949348 A1 EP 0949348A1
Authority
EP
European Patent Office
Prior art keywords
cooling
strip
profile
cooling medium
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98810309A
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German (de)
French (fr)
Inventor
Hermann Pont
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3A Composites International AG
Original Assignee
Alusuisse Lonza Services Ltd
Alusuisse Technology and Management Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alusuisse Lonza Services Ltd, Alusuisse Technology and Management Ltd filed Critical Alusuisse Lonza Services Ltd
Priority to EP98810309A priority Critical patent/EP0949348A1/en
Publication of EP0949348A1 publication Critical patent/EP0949348A1/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C29/00—Cooling or heating work or parts of the extrusion press; Gas treatment of work
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • 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

Definitions

  • the invention relates to a method for controlled cooling in one Continuous-flow annealing furnace or strip heated to solution annealing temperature one heated to solution annealing temperature during extrusion Aluminum alloy profile immediately after the tape emerges from the continuous annealing furnace or the profile from the die of an extrusion press, the band or profile by directly applying its Surface is cooled with a cooling medium.
  • EP-A-0343103 describes a method for cooling pressed profiles and Rolling strips are known in which a water mist is generated by means of spray nozzles becomes. This known cooling method using spray nozzles is in EP-A-0429394 described for cooling cast metal strands.
  • EP-A-0578607 describes an inline method for cooling from a Extruded extruded profiles disclosed, in which the from EP-A-0343103 known spray nozzles are installed in modules.
  • EP-A-0695590 describes a method and a device for cooling known from hot-rolled plates and strips made of an aluminum alloy, being cut plates or strips continuously a cooling station run through and directly charged with water via flat jet nozzles become. Immediately after it exits the flat fan nozzle the water jet periodically by means of air or water jets distracted that the water jet hitting the plate or belt surface performs a wiping motion. With the use of flat jet nozzles arises when the water jet hits the plate or belt surface a narrow impact surface with high heat transfer. This locally high heat transfer together with the wiping movement leads to a even heat removal.
  • the invention is therefore based on the object of a method of the beginning to create the type mentioned, with which in a simple manner an over the entire Strip or profile surface with locally independent cooling gradient sufficient cooling rate can be set at the same time can.
  • a cooling medium is used Gas or gas mixture with a boiling point of max. -150 ° C in liquid form is sprayed evenly onto the belt or profile surface.
  • liquid gas as a coolant compared to water Another advantage of a liquid gas as a coolant compared to water is that the liquid gas medium is easier to control.
  • the negative Tendency of water after hitting the strip or profile surface to flow back into the furnace or into the die and there explosive Evaporation can occur when using LPG as the cooling medium be avoided.
  • the cooling capacity can be optimized control what is producing accurate and reproducible cooling conditions enables.
  • For even distribution of the liquid gas on the belt or Profile surface can basically be the well-known for cooling Water nozzle systems are used.
  • Liquid nitrogen is used as the preferred cooling medium.
  • the delivery rate of the cooling medium is expediently set so that the cooling medium hitting the strip or profile surface is complete evaporates.
  • the complete evaporation prevents the formation of heat inhibiting liquid gas film.
  • the inventive Cooling with liquefied gas offers here compared to the usual Water cooling processes have the decisive advantage that faults the band or the profile can be prevented without special measures can. In the less critical temperature range below about 250 ° C can be switched to conventional in a stage following the liquid gas cooling Be further cooled with water or air.

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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)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

A gas or a gas mixture with a boiling point of about 123K in liquid form is sprayed onto the strip or profile surface.

Description

Die Erfindung betrifft ein Verfahren zum kontrollierten Abkühlen eines in einem Banddurchlaufglühofen auf Lösungsglühtemperatur erwärmten Bandes oder eines während des Strangpressens auf Lösungsglühtemperatur erwärmten Profils aus einer Aluminiumlegierung unmittelbar nach dem Austritt des Bandes aus dem Banddurchlaufglühofen bzw. des Profils aus der Matrize einer Strangpresse, wobei das Band oder das Profil durch direkte Beaufschlagung seiner Oberfläche mit einem Kühlmedium abgekühlt wird.The invention relates to a method for controlled cooling in one Continuous-flow annealing furnace or strip heated to solution annealing temperature one heated to solution annealing temperature during extrusion Aluminum alloy profile immediately after the tape emerges from the continuous annealing furnace or the profile from the die of an extrusion press, the band or profile by directly applying its Surface is cooled with a cooling medium.

Zur Erzielung optimaler mechanischer Festigkeitswerte nach einer Kalt- und/oder und/oder Warmauslagerung einer Aluminiumlegierung ist eine möglichst rasche Abkühlung von der Lösungsglühtemperatur bzw. von der Metalltemperatur beim Austritt aus der Matrize einer Strangpresse erforderlich.To achieve optimal mechanical strength values after a cold and / or and / or hot aging of an aluminum alloy is one possible rapid cooling from the solution annealing temperature or from the metal temperature required when leaving the die of an extrusion press.

Aus der EP-A-0343103 ist ein Verfahren zum Kühlen von Pressprofilen und Walzbändern bekannt, bei dem mittels Spraydüsen ein Wassernebel erzeugt wird. Dieses vorbekannte Kühlverfahren mittels Spraydüsen ist in der EP-A-0429394 zum Kühlen gegossener Metallstränge beschrieben.EP-A-0343103 describes a method for cooling pressed profiles and Rolling strips are known in which a water mist is generated by means of spray nozzles becomes. This known cooling method using spray nozzles is in EP-A-0429394 described for cooling cast metal strands.

In der EP-A-0578607 ist ein Inline-Verfahren zum Kühlen von aus einer Strangpresse austretenden Profilen offenbart, bei welchem die aus der EP-A-0343103 bekannten Spraydüsen in Module eingebaut sind.EP-A-0578607 describes an inline method for cooling from a Extruded extruded profiles disclosed, in which the from EP-A-0343103 known spray nozzles are installed in modules.

Aus der EP-A-0695590 ist ein Verfahren sowie eine Vorrichtung zum Kühlen von warmgewalzten Platten und Bändern aus einer Aluminiumlegierung bekannt, wobei abgelängte Platten oder Bänder kontinuierlich eine Kühlstation durchlaufen und in dieser über Flachstrahldüsen direkt mit Wasser beaufschlagt werden. Unmittelbar nach seinem Austritt aus der Flachstrahldüse wird der Wasserstrahl zusätzlich mittels Luft- oder Wasserstrahlen periodisch derart abgelenkt, dass der auf die Platten- oder Bandoberfläche auftreffende Wasserstrahl eine Wischbewegung ausführt. Mit dem Einsatz von Flachstrahldüsen ergibt sich beim Auftreffen des Wasserstrahls auf der Platten- oder Bandoberfläche eine schmale Auftreffläche mit hohem Wärmeübergang. Dieser lokal hohe Wärmeübergang führt zusammen mit der Wischbewegung zu einem gleichmässigen Wärmeentzug.EP-A-0695590 describes a method and a device for cooling known from hot-rolled plates and strips made of an aluminum alloy, being cut plates or strips continuously a cooling station run through and directly charged with water via flat jet nozzles become. Immediately after it exits the flat fan nozzle the water jet periodically by means of air or water jets distracted that the water jet hitting the plate or belt surface performs a wiping motion. With the use of flat jet nozzles arises when the water jet hits the plate or belt surface a narrow impact surface with high heat transfer. This locally high heat transfer together with the wiping movement leads to a even heat removal.

Den vorbekannten Verfahren gemeinsam ist die Verwendung von Wasser als Kühlmedium. Die hohe spezifische Wärme von Wasser führt zwar zu einem starken Wärmeentzug aus dem zu kühlenden Band oder Profil mit entsprechend hoher Abkühlungsgeschwindigkeit. Der Wärmeübergang von der Band- oder oder Profiloberfläche auf das Kühlmittel zeigt jedoch selbst bei Anordnung spezieller Düsen lokale Unterschiede. Es entstehen örtliche Ansammlungen von Kühlmittel, die zu einer unkontrollierten Abkühlung und damit zu unterschiedlichen mechanischen Eigenschaften in Oberflächennähe des Gegenstandes führen können. Derartige Unterschiede in den mechanischen Eigenschaften können sich beispielsweise bei einer späteren Umformoperation infolge eines lokal unterschiedlichen Umformverhaltens störend auf die Oberflächenqualität auswirken.Common to the previously known methods is the use of water as Cooling medium. The high specific heat of water leads to one strong heat withdrawal from the band or profile to be cooled with accordingly high cooling rate. The heat transfer from the belt or or profile surface on the coolant, however, shows more specific even when arranged Local differences nozzles. Local collections of Coolants that lead to an uncontrolled cooling and thus to different mechanical properties near the surface of the object being able to lead. Such differences in mechanical properties can, for example, in a later forming operation as a result of a locally different forming behavior disturbs the surface quality impact.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art zu schaffen, mit welchem auf einfache Weise ein über die gesamte Band- oder Profiloberfläche lokal unabhängiger Abkühlungsgradient bei gleichzeitig ausreichender Abkühlungsgeschwindigkeit eingestellt werden kann.The invention is therefore based on the object of a method of the beginning to create the type mentioned, with which in a simple manner an over the entire Strip or profile surface with locally independent cooling gradient sufficient cooling rate can be set at the same time can.

Zur erfindungsgemässen Lösung der Aufgabe führt, dass als Kühlmedium ein Gas oder Gasgemisch mit einem Siedepunkt von max. -150°C in flüssiger Form gleichmässig auf die Band- oder Profiloberfläche aufgesprüht wird. To achieve the object according to the invention, a cooling medium is used Gas or gas mixture with a boiling point of max. -150 ° C in liquid form is sprayed evenly onto the belt or profile surface.

Mit der erfindungsgemässen Verwendung eines flüssigen Gases als Kühlmedium ergibt sich einerseits ein hoher Temperaturgradient bei der Abkühlung, andererseits ist der Wärmeübergang geringer als beim üblicherweise verwendeten Kühlmittel Wasser. Die Kombination dieser beiden Eigenschaften führt zu einer über die gesamte Band- bzw. Profiloberfläche gleichmässig wirkenden Kühlung.With the use according to the invention of a liquid gas as a cooling medium on the one hand there is a high temperature gradient during cooling, on the other hand, the heat transfer is lower than that of the commonly used one Coolant water. The combination of these two properties leads to a uniformly acting over the entire band or profile surface Cooling.

Ein weiterer Vorteil eines flüssigen Gases als Kühlmittel im Vergleich zu Wasser liegt darin, dass das Flüssiggasmedium einfacher zu steuern ist. Die negative Tendenz von Wasser, nach dem Auftreffen auf der Band- bzw. Profiloberfläche in den Ofen bzw. in die Matrize zurückzufliessen und dort explosionsartige Verdampfungen auszulösen, kann beim Einsatz von Flüssiggas als Kühlmedium vermieden werden.Another advantage of a liquid gas as a coolant compared to water is that the liquid gas medium is easier to control. The negative Tendency of water after hitting the strip or profile surface to flow back into the furnace or into the die and there explosive Evaporation can occur when using LPG as the cooling medium be avoided.

Mit dem erfindungsgemässen Verfahren lässt sich die Kühlleistung optimal steuern, was die Erzeugung genauer und reproduzierbarer Abkühlbedingungen ermöglicht. Zur gleichmässigen Verteilung des flüssigen Gases auf der Band- bzw. Profiloberfläche können grundsätzlich die bekannten, zur Kühlung mit Wasser verwendeten Düsensysteme eingesetzt werden.With the method according to the invention, the cooling capacity can be optimized control what is producing accurate and reproducible cooling conditions enables. For even distribution of the liquid gas on the belt or Profile surface can basically be the well-known for cooling Water nozzle systems are used.

Als bevorzugtes Kühlmedium wird flüssiger Stickstoff verwendet.Liquid nitrogen is used as the preferred cooling medium.

Die Förderleistung des Kühlmediums wird zweckmässigerweise so eingestellt, dass das auf die Band- oder Profiloberfläche auftreffende Kühlmedium vollständig verdampft.The delivery rate of the cooling medium is expediently set so that the cooling medium hitting the strip or profile surface is complete evaporates.

Die vollständige Verdampfung verhindert die Ausbildung eines den Wärmeentzug hemmenden Flüssiggasfilms.The complete evaporation prevents the formation of heat inhibiting liquid gas film.

Um den während der Lösungsglühung in der Legierung erzeugten Gefügezustand für die spätere Kalt- und/oder Warmauslagerung optimal nutzen zu können, ist vor allem ein rasches Durchlaufen der hohen Temperaturbereiche von der Lösungsglühtemperatur bis auf etwa 250°C zwingend erforderlich. Die erfindungsgemässe Abkühlung mit Flüssiggas bietet hier gegenüber den üblichen Wasserkühlverfahren den entscheidenden Vorteil, dass Verwerfungen des Bandes oder des Profils ohne besondere Massnahmen verhindert werden können. Im weniger kritischen Temperaturbereich unterhalb von etwa 250°C kann in einer der Flüssiggaskühlung nachfolgenden Stufe auf konventionelle Weise mit Wasser oder mit Luft weitergekühlt werden.The structural state created in the alloy during solution annealing to be able to use it optimally for later cold and / or warm aging, is above all a quick run through the high temperature ranges of the solution annealing temperature up to about 250 ° C is absolutely necessary. The inventive Cooling with liquefied gas offers here compared to the usual Water cooling processes have the decisive advantage that faults the band or the profile can be prevented without special measures can. In the less critical temperature range below about 250 ° C can be switched to conventional in a stage following the liquid gas cooling Be further cooled with water or air.

Claims (4)

Verfahren zum kontrollierten Abkühlen eines in einem Banddurchlaufglühofen auf Lösungsglühtemperatur erwärmten Bandes oder eines während des Strangpressens auf Lösungsglühtemperatur erwärmten Profils aus einer Aluminiumlegierung unmittelbar nach dem Austritt des Bandes aus dem Banddurchlaufglühofen bzw. des Profils aus der Matrize einer Strangpresse, wobei das Band oder das Profil durch direkte Beaufschlagung seiner Oberfläche mit einem Kühlmedium abgekühlt wird,
dadurch gekennzeichnet, dass als Kühlmedium ein Gas oder Gasgemisch mit einem Siedepunkt von max. -150°C in flüssiger Form gleichmässig auf die Band- oder Profiloberfläche aufgesprüht wird. Process for the controlled cooling of a strip heated to solution annealing temperature in a continuous strip annealing furnace or an aluminum alloy profile heated to solution annealing temperature during extrusion immediately after the strip has exited the continuous strip annealing furnace or the profile from the die of an extruder, the strip or the profile passing through cooling is directly applied to its surface,
characterized in that a gas or gas mixture with a boiling point of max. -150 ° C in liquid form is sprayed evenly onto the strip or profile surface. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass als Kühlmedium flüssiger Stickstoff eingesetzt wird.A method according to claim 1, characterized in that as a cooling medium liquid nitrogen is used. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Förderleistung des Kühlmediums so eingestellt wird, dass das auf die Band- oder Profiloberfläche auftreffende Kühlmedium vollständig verdampft.A method according to claim 1 or 2, characterized in that the Flow rate of the cooling medium is set so that the The cooling medium hitting the strip or profile surface completely evaporates. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet dass das Band oder das Profil unmittelbar nach der Abkühlung mit flüssigem Gas in einer nachfolgenden Stufe-mit Wasser oder Luft weitergekühlt wird.Method according to one of claims 1 to 3, characterized that the tape or profile immediately after cooling with liquid Gas in a subsequent stage - cooled with water or air becomes.
EP98810309A 1998-04-09 1998-04-09 Process for controlled cooling of aluminium alloy strips and profiles Withdrawn EP0949348A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98810309A EP0949348A1 (en) 1998-04-09 1998-04-09 Process for controlled cooling of aluminium alloy strips and profiles

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Application Number Priority Date Filing Date Title
EP98810309A EP0949348A1 (en) 1998-04-09 1998-04-09 Process for controlled cooling of aluminium alloy strips and profiles

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001044532A1 (en) * 1999-12-17 2001-06-21 Alcan International Limited Method of quenching alloy sheet to minimize distortion
DE10207584A1 (en) * 2002-02-22 2003-09-11 Vits Maschb Gmbh I Ins Process for cooling metal strips or plates and cooling device
DE102016102093B3 (en) * 2016-02-05 2017-06-14 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Continuous cooling device and method for cooling a metal strip

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB931865A (en) * 1959-08-18 1963-07-17 British Oxygen Co Ltd Cooling of solid material
US3184349A (en) * 1963-04-08 1965-05-18 Ovitron Corp Heat treatment of precision aluminum assemblies
US3185600A (en) * 1963-06-13 1965-05-25 Grumman Aircraft Engineering C Cryogenic quenching method
JPS5577925A (en) * 1978-12-06 1980-06-12 Nippon Sanso Kk Extrusion forming method for aluminum alloy
DE3234863A1 (en) * 1982-09-21 1984-03-22 Messer Griesheim Gmbh, 6000 Frankfurt METHOD AND DEVICE FOR BLANK GLOWING OF METAL WORKPIECES WITH NITROGEN AS PROTECTIVE GAS
JPS6457911A (en) * 1987-08-28 1989-03-06 Sumitomo Light Metal Ind Extruding method for aluminum
JPH02127916A (en) * 1988-11-04 1990-05-16 Showa Alum Corp Manufacture of 7000 group al alloy extruded material suppressing surface recrystallization

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB931865A (en) * 1959-08-18 1963-07-17 British Oxygen Co Ltd Cooling of solid material
US3184349A (en) * 1963-04-08 1965-05-18 Ovitron Corp Heat treatment of precision aluminum assemblies
US3185600A (en) * 1963-06-13 1965-05-25 Grumman Aircraft Engineering C Cryogenic quenching method
JPS5577925A (en) * 1978-12-06 1980-06-12 Nippon Sanso Kk Extrusion forming method for aluminum alloy
DE3234863A1 (en) * 1982-09-21 1984-03-22 Messer Griesheim Gmbh, 6000 Frankfurt METHOD AND DEVICE FOR BLANK GLOWING OF METAL WORKPIECES WITH NITROGEN AS PROTECTIVE GAS
JPS6457911A (en) * 1987-08-28 1989-03-06 Sumitomo Light Metal Ind Extruding method for aluminum
JPH02127916A (en) * 1988-11-04 1990-05-16 Showa Alum Corp Manufacture of 7000 group al alloy extruded material suppressing surface recrystallization

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 120 (M - 028) 26 August 1980 (1980-08-26) *
PATENT ABSTRACTS OF JAPAN vol. 013, no. 252 (M - 836) 12 June 1989 (1989-06-12) *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 361 (M - 1006) 6 August 1990 (1990-08-06) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001044532A1 (en) * 1999-12-17 2001-06-21 Alcan International Limited Method of quenching alloy sheet to minimize distortion
DE10207584A1 (en) * 2002-02-22 2003-09-11 Vits Maschb Gmbh I Ins Process for cooling metal strips or plates and cooling device
DE102016102093B3 (en) * 2016-02-05 2017-06-14 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Continuous cooling device and method for cooling a metal strip
WO2017133867A1 (en) 2016-02-05 2017-08-10 Bwg Bergwerk- Und Walzwerk-Maschinenbau Gmbh Continuous flow cooling device and method for cooling a metal strip
US11072834B2 (en) 2016-02-05 2021-07-27 Redex S.A. Continuous-flow cooling apparatus and method of cooling strip therewith

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