EP0988405A1 - Method and installation for producing hot rolled aluminium tape intended for can making - Google Patents

Method and installation for producing hot rolled aluminium tape intended for can making

Info

Publication number
EP0988405A1
EP0988405A1 EP98932008A EP98932008A EP0988405A1 EP 0988405 A1 EP0988405 A1 EP 0988405A1 EP 98932008 A EP98932008 A EP 98932008A EP 98932008 A EP98932008 A EP 98932008A EP 0988405 A1 EP0988405 A1 EP 0988405A1
Authority
EP
European Patent Office
Prior art keywords
rolling
strip
hot
reversing
collar
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.)
Ceased
Application number
EP98932008A
Other languages
German (de)
French (fr)
Inventor
Reimar Finck
Jürgen HIRSCH
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.)
SMS Siemag AG
Vaw Aluminium AG
Original Assignee
Mannesmann AG
Vereinigte Aluminium Werke AG
Vaw Aluminium AG
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 Mannesmann AG, Vereinigte Aluminium Werke AG, Vaw Aluminium AG filed Critical Mannesmann AG
Publication of EP0988405A1 publication Critical patent/EP0988405A1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • 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
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product

Definitions

  • Process and plant for the production of hot-rolled AI can strip
  • the invention relates to a method and a plant for carrying out the method for producing hot-rolled Al-can strip, especially in rolling mills, whose annual production capacity is below 250,000 tons, with a reversing roughing of the raw material used hot and immediately subsequent finishing rolling of the strip, which is a heat treatment of the coiled reel follows.
  • Pre-rolled reversing stand and then finish-rolled on a multi-stand mill Pre-rolled reversing stand and then finish-rolled on a multi-stand mill.
  • Four-high mill stands are usually used in the finishing train, whereby care must be taken to ensure that constant temperature conditions are maintained within the mill so that the strip that is coiled up into a bundle is given the desired optimal rolling structure.
  • a reel temperature of approx. 320 ° C should be aimed for.
  • the finished rolled Al strip is given the structure with cube texture which is known in specialist circles and which is particularly well suited for deep-drawing aluminum cans due to its low tip formation.
  • the other practiced method for the production of aluminum can strip provides a reversing rolling mill with reels arranged on both sides for the final rolling of the strip.
  • the method has the disadvantage that there is an uneven temperature distribution over the length when the tape is wound up and unwound of the strip and therefore the desired even structure in the rolled out bundle cannot be achieved.
  • an intermediate annealing is carried out in the subsequent cold rolling process, which improves the deep-drawing ability of the aluminum can strip somewhat, but does not form the cube texture in the strip material that is favorable for the deformation process.
  • the aim of the present invention is to provide a practicable and economical solution for producing high-quality canned strip on hot rolling mills with an annual capacity of less than 250,000 tons, in which the cube texture which is favorable for forming the Al strip is formed.
  • the last, preferably three, hot rolling passes of the finishing train on a reversing roll stand from bundle to bundle are not recrystallized in the uncritical temperature range from 260 ° C. to 280 ° C. and each coiled finished bundle is fed to a bundle piercing furnace immediately afterwards and using the rolling heat in which the finished bundles on
  • Recrystallization temperature (315 320 ° C) are heated.
  • the last three hot rolling passes are carried out from bundle to bundle on a finishing mill especially for a minimill concept.
  • a finishing mill consists of a single reversing roll stand with reels arranged on both sides, so that initially the high investments for the four-high finishing stands of a multi-stand mill are eliminated. Since the temperature control and the rolling and pause times are critical, especially in the case of minimill concepts, the invention provides for the strip to be rolled in the uncritical range from 260 ° C. to 280 ° C. and only then and using the rolling heat in a subsequent furnace to the recrystallization temperature to warm up.
  • Such an oven then only has to apply the temperature difference of approx. 40 ° -60 C between the rolling temperature and the recrystallization temperature and thus achieves a favorable energy balance.
  • An annealing during or before cold rolling can be omitted by the method according to the invention.
  • the microstructure (the cube texture) corresponds to the product produced on multi-stand hot strip finishing mills without the high investments required there.
  • a system for carrying out the method according to the invention is characterized in that the finish rolling is carried out on a four-high reversing stand with winding devices arranged on both sides, that one of the winding devices corresponds to a coil transport device for the finished coil, which is connected to a coil piercing furnace, into which the coil is fed Heat treatment can be introduced.
  • the system thus essentially consists of two reversing stands, one of which, as a roughing stand, pre-rolls the block heated to the rolling temperature in a conventional manner, and that second reversing stand is provided with reel devices arranged on both sides, in which the strip is wound up and unwound into bundles in several reversing stitches.
  • the finished coil is transferred to the coil transport device with a coil transfer device, with which the finished coil is transported to an adjacent coil piercing furnace.
  • the introduction of the bundle piercing furnace is carried out to heat the bundle to the recrystallization temperature outside the rolling mill so that the desired structure is obtained.
  • the collision piercing furnace is preferably equipped with a pallet transport system in which a plurality of pallets which are arranged on the end face and receive the bundles can be transported through the furnace by moving these pallets.
  • pallet transport systems are known per se; by the cyclical shifting of the first pallet by means of a shifting device, for example a hydraulic cylinder, the row of pallets behind it is also shifted, so that with each pallet inserted into the furnace and covered with a collar, a pallet with a finished heat-treated collar on the discharge side of the Collision piercing furnace is ejected. After cooling, the coil is fed to the cold rolling mill without the need for further heat treatment.
  • a roughly schematic representation of a plant according to the invention is shown in the single drawing figure. It consists of the four-high reversing stand 1, the four-high reversing finishing stand 2 following in the rolling direction and the coil piercing furnace 3.
  • the raw material used in the form of a heated aluminum block at 4 is, as indicated at 5, rolled out in several reversing stitches in the four-high stand 1 of the roughing train to a preliminary strip 6 and immediately thereafter inserted into the finishing train consisting of the four-high reversing stand 2.
  • the preliminary strip 6 is rolled out into a finished strip in several reversing stitches 7, the strip being wound up on both sides of the four-high reversing stand 2 after each rolling pass, as indicated at 8 and 9.
  • At least three hot rolling passes are preferably provided according to this procedure.
  • the coil B wound at 9 is transferred from a transfer device, not shown, to a coil transport device, indicated at 10, which transports the coil B to the coil piercing furnace 3.
  • a coil transport device indicated at 10
  • the collar B is placed on a pallet 11, of which a large number of similar pallets 11 can be moved through the collar piercing furnace 3.
  • the pallet 1 with the collar B is pushed into the furnace with the furnace door 3a open, and at the same time a pallet 13 with a heat-treated collar B is ejected through the likewise opened furnace door 3b at the front end of the collar piercing furnace 3.
  • inside the furnace there are end-to-end pallets 11 with an equal number of bundles B which, when passing through the bundle piercing furnace 3, reach a temperature above the recrystallization temperature of the aluminum strip, i.e. 315-320 ° C.
  • the reversing rolling passes 7 were carried out in the four-high reversing finishing stand 2 at a temperature below the recrystallization temperature of approx. 260-280 ° C.

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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)
  • Metal Rolling (AREA)

Abstract

The present invention relates to a method for producing hot rolled aluminium tape for can making, including in rolling units with a production capacity per annum lower to 250.000 units, with reversing breaking-down of the raw material, directly followed by the final rolling pass and then a hot process of the tape which is unwound in strips. When making the last stitches during the final rolling pass, the temperature of the hot tape is controlled so as to prevent recrystallation in the rolling stock, said recrystallation being triggered in a targeted manner right after the final rolling pass. The invention also relates to an installation for implementing the method concerned.

Description

Verfahren und Anlage zur Erzeugung von warmgewalztem AI-DosenbandProcess and plant for the production of hot-rolled AI can strip
Beschreibungdescription
Die Erfindung betrifft ein Verfahren und eine Anlage zur Durchführung des Verfahrens zur Erzeugung von warmgewalztem AI-Dosenband, insbesondere in Walzanlagen, deren Jahresproduktionskapazität unterhalb 250.000 Tonnen liegt, mit einer reversierenden Vorwalzung des warm eingesetzten Vormaterials und unmittelbar daran anschließender Fertigwalzung des Bandes, der eine Wärmebehandlung des zu Bunden aufgehaspelten Bandes folgt.The invention relates to a method and a plant for carrying out the method for producing hot-rolled Al-can strip, especially in rolling mills, whose annual production capacity is below 250,000 tons, with a reversing roughing of the raw material used hot and immediately subsequent finishing rolling of the strip, which is a heat treatment of the coiled reel follows.
Für die Warmfertigung von AI-Dosenband sind im wesentlichen zwei Verfahren bekannt, die weltweit zur Anwendung kommen. Gute Qualitäten erreicht man nach dem einen Verfahren, wenn der auf Walztemperatur erwärmte Aluminiumblock zunächst reversierend in einer Vorstraße, beispielsweise einen Quarto-There are essentially two processes known for the hot production of AI can strip that are used worldwide. Good qualities can be achieved in one process if the aluminum block heated to the rolling temperature is first reversed in a roughing train, for example a four-high
Reversiergerüst vorgewalzt und im Anschluß daran auf einer mehrgerüstigen Straße fertiggewalzt wird. In der Fertigstraße werden gewöhnlich Quarto-Walzgerüste eingesetzt, wobei darauf zu achten ist, daß innerhalb der Straße konstante Temperaturbedingungen eingehalten werden, damit das am Ende zu einem Bund aufgehaspelte Band das gewünschte optimale Walzgefüge erhält. Anzustreben ist eine Haspeltemperatur von ca. 320°C. Das fertiggewalzte AI-Band erhält bei entsprechend eingestellter Temperatur das in Fachkreisen bekannte Gefüge mit Würfeltextur, das sich wegen geringer Zipfelbildung besonders gut zum Tiefziehen von Aluminiumdosen eignet.Pre-rolled reversing stand and then finish-rolled on a multi-stand mill. Four-high mill stands are usually used in the finishing train, whereby care must be taken to ensure that constant temperature conditions are maintained within the mill so that the strip that is coiled up into a bundle is given the desired optimal rolling structure. A reel temperature of approx. 320 ° C should be aimed for. When the temperature is set appropriately, the finished rolled Al strip is given the structure with cube texture which is known in specialist circles and which is particularly well suited for deep-drawing aluminum cans due to its low tip formation.
Das andere praktizierte Verfahren zur Herstellung von Aluminiumdosenband sieht für die Fertigwalzung des Bandes ein Reversierwalzwerk mit beidseitig angeordneten Haspeln vor. Das Verfahren hat aber den Nachteil, daß sich bei dem Auf- und Abwickeln des Bandes eine ungleichmäßige Temperaturverteilung über die Länge des Bandes einstellt und deshalb die erwünschte gleichmäßige Gefügeausbildung im ausgewalzten Bund nicht erreichbar ist. Aus diesem Grund führt man bei diesem Verfahren eine Zwischgenglühung beim anschließenden Kaltwalzprozeß durch, die zwar die Tiefziehfähigkeit des AI-Dosenbandes etwas verbessert, nicht jedoch die für den Verformungsvorgang günstige Würfeltextur im Bandmaterial ausbildet.The other practiced method for the production of aluminum can strip provides a reversing rolling mill with reels arranged on both sides for the final rolling of the strip. However, the method has the disadvantage that there is an uneven temperature distribution over the length when the tape is wound up and unwound of the strip and therefore the desired even structure in the rolled out bundle cannot be achieved. For this reason, in this process an intermediate annealing is carried out in the subsequent cold rolling process, which improves the deep-drawing ability of the aluminum can strip somewhat, but does not form the cube texture in the strip material that is favorable for the deformation process.
Während das zuletzt genannte Verfahren aus den geschilderten Gründen für die Dosenbandherstellung nur eingeschränkt verwendbar ist, besteht der Nachteil des zuerst beschriebenen Verfahrens in den hohen Investitionskosten, insbesondere für die mehrgerüstige Fertigstraße. Aus diesem Grund ist dieses Verfahrens nur dann wirtschaftlich sinnvoll anwendbar, wenn das betreffende Walzwerk eine Jahresproduktion von mehr als 500.000 tpa leisten kann. Für kleinere Walzwerke, sogenannte Minimills, ist das bekannte Verfahren nicht rentabel einsetzbar.While the latter method can only be used to a limited extent for the production of canned strips, the disadvantage of the method described first is the high investment costs, in particular for the multi-stand finishing train. For this reason, this method can only be used economically if the rolling mill in question can produce more than 500,000 tpa per year. The known method cannot be used profitably for smaller rolling mills, so-called minimills.
Ausgehend von den beschriebenen Nachteilen des Standes der Technik ist es dasBased on the disadvantages of the prior art described, it is
Ziel der vorliegenden Erfindung, eine praktikable und wirtschaftliche Lösung zur Herstellung von qualitativ hochwertigem Dosenband auf Warmwalzwerken mit einer Jahreskapazität unter 250.000 Tonnen bereitzustellen, bei der die zum Umformen des AI-Bandes günstige Würfeltextur ausgebildet ist.The aim of the present invention is to provide a practicable and economical solution for producing high-quality canned strip on hot rolling mills with an annual capacity of less than 250,000 tons, in which the cube texture which is favorable for forming the Al strip is formed.
Zur Lösung der Aufgabe wird, ausgehend von einem Verfahren, bei dem das reversierend vorgewalzte Vormaterial unmittelbar daran fertiggewalzt wird, vorgeschlagen, durch gesteuerte Temperaturführung des Warmbandes während der letzten Fertigwalzstiche die Rekristallisation im Walzgut zu unterdrücken und die Rekristallisation erst im unmittelbaren Anschluß an die Fertigwalzung außerhalb der Walzstraße gezielt herbeizuführen. Es hat sich gezeigt, daß ein AI-Dosenband die bei gattungsgemäßen mehrgerüstigen Walzstraßen günstige Würfeltextur auch dann erhält, wenn während der letzten Fertigstiche keine Rekristallisation im Walzgut stattfindet, also die Temperatur entsprechend niedrig gehalten wird. Statt dessen findet die Rekristallisation erst im Anschluß an die Fertigwalzung außerhalb der Walzstraße statt und wird dort durch Erwärmen des zu Bunden aufgehaspelten Bandes herbeigeführt. Günstigerweise ist vorgesehen, daß die letzten, vorzugsweise drei Warmwalzstiche der Fertigstraße auf einem Reversierwalzgerüst von Bund zu Bund im unkritischen Temperaturbereich von 260 C bis 280 C nicht rekristallisierend ausgeführt werden und jedes aufgehaspelte Fertigbund unmittelbar im Anschluß daran und unter Ausnutzung der Walzhitze einem Bunddurchstoßofen zugeführt wird, in dem die Fertigbunde aufTo solve the problem, starting from a method in which the reversely pre-rolled primary material is directly rolled on it, it is proposed to suppress the recrystallization in the rolling stock by controlled temperature control of the hot strip during the last finish rolling passes and the recrystallization only immediately after the finish rolling outside to bring about the rolling mill in a targeted manner. It has been shown that an Al-can strip maintains the cube texture that is favorable in generic multi-stand rolling mills even if no recrystallization takes place in the rolling stock during the last finishing pass, that is to say the temperature is kept correspondingly low. Instead, the recrystallization only takes place after the finish rolling outside the rolling mill and is brought about there by heating the strip wound up into coils. It is advantageously provided that the last, preferably three, hot rolling passes of the finishing train on a reversing roll stand from bundle to bundle are not recrystallized in the uncritical temperature range from 260 ° C. to 280 ° C. and each coiled finished bundle is fed to a bundle piercing furnace immediately afterwards and using the rolling heat in which the finished bundles on
Rekristallisationstemperatur (315 320 °C) erwärmt werden.Recrystallization temperature (315 320 ° C) are heated.
Unter Berücksichtigung der Erkenntnis, daß der Warmprozeß für die Erzeugung des AI-Dosenbandes in mehrfacher Hinsicht von entscheidender Bedeutung für die Performance des Endproduktes ist, werden speziell für ein Minimill-Konzept die letzten drei Warmwalzstiche von Bund zu Bund auf einem Fertigwalzwerk ausgeführt. Ein solches Fertigwalzwerk besteht aus einem einzelnen Reversierwalzgerüst mit beidseitig angeordneten Haspeln, so daß zunächst die hohen Investitionen für die Quarto-Fertiggerüste einer mehrgerüstigen Straße entfallen. Da die Temperaturführung und die Walz- und Pausenzeiten -speziell bei Minimill-Konzepten- kritisch sind, sieht die Erfindung vor, das Band im unkritischen Bereich von 260 C bis 280 C zu walzen und erst und unter Ausnutzung der Walzhitze in einem anschließenden Ofen auf Rekristallisationstemperatur zu erwärmen. Ein solcher Ofen muß dann lediglich die Temperaturdifferenz von ca. 40°-60 C zwischen der Walztemperatur und der Rekristallisationstemperatur aufbringen und erreicht somit eine günstige Energiebilanz. Ein Glühen beim bzw. vor dem Kaltwalzen kann durch das erfindungsgemäße Verfahren entfallen. Die Gefügestruktur (die Würfeltextur) entspricht dem auf mehrgerüstigen Warmbandfertigwalzwerken erzeugten Produkt, ohne daß die dort notwendigen hohen Investitionen erforderlich sind.Taking into account the knowledge that the hot process for the production of the AI can band is of crucial importance for the performance of the end product in several respects, the last three hot rolling passes are carried out from bundle to bundle on a finishing mill especially for a minimill concept. Such a finishing mill consists of a single reversing roll stand with reels arranged on both sides, so that initially the high investments for the four-high finishing stands of a multi-stand mill are eliminated. Since the temperature control and the rolling and pause times are critical, especially in the case of minimill concepts, the invention provides for the strip to be rolled in the uncritical range from 260 ° C. to 280 ° C. and only then and using the rolling heat in a subsequent furnace to the recrystallization temperature to warm up. Such an oven then only has to apply the temperature difference of approx. 40 ° -60 C between the rolling temperature and the recrystallization temperature and thus achieves a favorable energy balance. An annealing during or before cold rolling can be omitted by the method according to the invention. The microstructure (the cube texture) corresponds to the product produced on multi-stand hot strip finishing mills without the high investments required there.
Eine Anlage zur Durchführung des erfindungsgemäßen Verfahrens ist dadurch gekennzeichnet, daß die Fertigwalzung auf einem Quarto-Reversiergerüst mit beidseitig angeordneten Aufwickelvorrichtungen erfolgt, daß eine der Aufwickelvorrichtungen mit einer Bundtransportvorrichtung für das Fertigbund korrespondiert, die andererseits mit einem Bunddurchstoßofen verbunden ist, in den das Bund zur Wärmebehandlung einführbar ist. Die Anlage besteht somit im wesentlichen aus zwei Reversiergerüsten, von denen das eine als Vorgerüst in konventioneller Weise den auf Walztemperatur erwärmten Block vorwalzt und das zweite Reversiergerüst mit beidseitig angeordneten Haspeleinrichtungen versehen ist, in denen das Band in mehreren Reversierstichen jeweils zu Bunden auf- und abgewickelt wird. Nach dem letzten Walzstich wird das Fertigbund mit einer Bundübergabevorrichtung auf die Bundtransportvorrichtung überführt, mit der das Fertigbund zu einem benachbarten Bunddurchstoßofen transportiert wird. NachA system for carrying out the method according to the invention is characterized in that the finish rolling is carried out on a four-high reversing stand with winding devices arranged on both sides, that one of the winding devices corresponds to a coil transport device for the finished coil, which is connected to a coil piercing furnace, into which the coil is fed Heat treatment can be introduced. The system thus essentially consists of two reversing stands, one of which, as a roughing stand, pre-rolls the block heated to the rolling temperature in a conventional manner, and that second reversing stand is provided with reel devices arranged on both sides, in which the strip is wound up and unwound into bundles in several reversing stitches. After the last rolling pass, the finished coil is transferred to the coil transport device with a coil transfer device, with which the finished coil is transported to an adjacent coil piercing furnace. To
Einführung in den Bunddurchstoßofen erfolgt die Erwärmung des Bundes auf Rekristallisationstemperatur außerhalb der Walzstraße, so daß das gewünschte Gefüge erhalten wird.The introduction of the bundle piercing furnace is carried out to heat the bundle to the recrystallization temperature outside the rolling mill so that the desired structure is obtained.
Vorzugsweise ist der Bunddurchstoßofen mit einem Palettentransportsystem ausgestattet, bei dem mehrere stirnseitig aneinanderliegende, die Bunde aufnehmende Paletten durch Verschieben dieser Paletten durch den Ofen transportierbar sind. Solche Palettentransportsysteme sind an sich bekannt; durch das taktweise Verschieben der ersten Palette mittels einer Verschiebeeinrichtung, beispielsweise einem Hydraulikzylinder, wird die Reihe dahinter liegender Paletten jeweils mit verschoben, so daß mit jeder in den Ofen eingeführten, mit einem Bund belegten Palette eine Palette mit einem fertig wärmebehandelten Bund auf der Austragseite des Bunddurchstoßofens ausgestoßen wird. Das Bund wird nach Abkühlung dem Kaltwalzwerk zugeleitet, ohne daß eine weitere Wärmebehandlung erfolgen muß.The collision piercing furnace is preferably equipped with a pallet transport system in which a plurality of pallets which are arranged on the end face and receive the bundles can be transported through the furnace by moving these pallets. Such pallet transport systems are known per se; by the cyclical shifting of the first pallet by means of a shifting device, for example a hydraulic cylinder, the row of pallets behind it is also shifted, so that with each pallet inserted into the furnace and covered with a collar, a pallet with a finished heat-treated collar on the discharge side of the Collision piercing furnace is ejected. After cooling, the coil is fed to the cold rolling mill without the need for further heat treatment.
Ein Ausführungsbeispiel der erfindungsgemäßen Anlage ist in der Zeichnung schematisch dargestellt und wird nachfolgend beschrieben.An embodiment of the system according to the invention is shown schematically in the drawing and is described below.
In der einzigen Zeichnungsfigur ist in grob schematischer Darstellung eine Anlage nach der Erfindung abgebildet. Sie besteht aus dem Quarto-Reversiergerüst 1 , dem in Walzrichtung folgenden Quarto-Reversier-Fertiggerüst 2 sowie dem Bunddurchstoßofen 3.A roughly schematic representation of a plant according to the invention is shown in the single drawing figure. It consists of the four-high reversing stand 1, the four-high reversing finishing stand 2 following in the rolling direction and the coil piercing furnace 3.
Das in Form eines erwärmten Aluminiumblockes bei 4 eingesetzte Vormaterial wird, wie bei 5 angedeutet, in mehreren Reversierstichen in dem Quarto-Gerüst 1 der Vorstraße zu einem Vorband 6 ausgewalzt und unmittelbar im Anschluß daran in die aus dem Quarto-Reversiergerüst 2 bestehende Fertigstraße eingeführt. In dem Quarto-Reversiergerüst wird das Vorband 6 in mehreren Reversierstichen 7 zu einem Fertigband ausgewalzt, wobei nach jedem Walzstich das Band beidseitig des Quarto- Reversiergerüstes 2, wie bei 8 und 9 angedeutet, aufgehaspelt wird. Vorzugsweise sind mindestens drei Warmwalzstiche nach dieser Verfahrensweise vorgesehen. Nach dem letzten Walzstich wird das bei 9 aufgewickelte Bund B von einer nicht dargestellten Übergabevorrichtung an eine bei 10 angedeutete Bundtransportvorrichtung übergeben, die das Bund B zu dem Bunddurchstoßofen 3 transportiert. Vor der stirnseitigen Ofentür, die bei 3a angedeutet ist, wird das Bund B auf einer Palette 11 abgelegt, von denen eine Vielzahl gleichartiger Paletten 11 durch den Bunddurchstoßofen 3 verschiebbar sind. Mit Hilfe der Verschiebeeinrichtung 12 inThe raw material used in the form of a heated aluminum block at 4 is, as indicated at 5, rolled out in several reversing stitches in the four-high stand 1 of the roughing train to a preliminary strip 6 and immediately thereafter inserted into the finishing train consisting of the four-high reversing stand 2. By doing Four-high reversing stand, the preliminary strip 6 is rolled out into a finished strip in several reversing stitches 7, the strip being wound up on both sides of the four-high reversing stand 2 after each rolling pass, as indicated at 8 and 9. At least three hot rolling passes are preferably provided according to this procedure. After the last rolling pass, the coil B wound at 9 is transferred from a transfer device, not shown, to a coil transport device, indicated at 10, which transports the coil B to the coil piercing furnace 3. In front of the front-side furnace door, which is indicated at 3a, the collar B is placed on a pallet 11, of which a large number of similar pallets 11 can be moved through the collar piercing furnace 3. With the help of the displacement device 12 in
Form einer Kolben-Zylindereinheit wird die Palette 1 mit dem Bund B bei geöffneter Ofentür 3a in den Ofen eingeschoben und gleichzeitig wird eine Palette 13 mit einem fertig wärmebehandelten Bund B durch die ebenfalls geöffnete Ofentür 3b am stirnseitigen Ende des Bunddurchstoßofens 3 ausgestoßen. Innerhalb des Ofens befinden sich im dargestellten Ausführungsbeispiel 7 stirnseitig aneinanderliegende Paletten 11 mit einer gleichen Anzahl von Bunden B, die beim Durchgang durch den Bunddurchstoßofen 3 auf eine Temperatur oberhalb der Rekristallisationstemperatur des Aluminiumbandes, d.h. ca. 315-320 °C erwärmt werden. Hingegen erfolgten die Reversierwalzstiche 7 im Quarto-Reversier-Fertiggerüst 2 bei einer Temperatur unterhalb der Rekristallisationstemperatur von ca. 260-280 °C. In the form of a piston-cylinder unit, the pallet 1 with the collar B is pushed into the furnace with the furnace door 3a open, and at the same time a pallet 13 with a heat-treated collar B is ejected through the likewise opened furnace door 3b at the front end of the collar piercing furnace 3. In the illustrated embodiment 7, inside the furnace there are end-to-end pallets 11 with an equal number of bundles B which, when passing through the bundle piercing furnace 3, reach a temperature above the recrystallization temperature of the aluminum strip, i.e. 315-320 ° C. On the other hand, the reversing rolling passes 7 were carried out in the four-high reversing finishing stand 2 at a temperature below the recrystallization temperature of approx. 260-280 ° C.

Claims

Patentansprüche claims
1. Verfahren zur Erzeugung von warmgewalztem AI-Dosenband, insbesondere in Walzanlagen, deren Jahresproduktionskapazität unterhalb 250.000 t liegt, mit einer reversierenden Vorwalzung des warm eingesetzten Vormaterials und unmittelbar daran anschließender Fertigwalzung des Bandes, der eine1. A process for the production of hot-rolled Al-can strip, especially in rolling mills, whose annual production capacity is below 250,000 t, with a reversing roughing of the hot material used and immediately subsequent finishing rolling of the strip, the one
Wärmebehandlung des zu Bunden aufgehaspelten Bandes folgt, dadurch gekennzeichnet, daß während der letzten Fertigwalzstiche die Rekristallisation im Walzgut durch gesteuerte Temperaturführung des Warmbandes unterdrückt und die Rekristallisation erst im unmittelbaren Anschluß an die Fertigwalzung außerhalb der Walzstraße gezielt herbeigeführt wird.Heat treatment of the strip coiled into coils follows, characterized in that during the last finishing rolling passes the recrystallization in the rolling stock is suppressed by controlled temperature control of the hot strip and the recrystallization is only brought about directly after the finishing rolling outside the rolling mill.
2. Verfahren zur Erzeugung von warmgewalztem AI-Dosenband nach Anspruch2. The method for producing hot-rolled AI can strip according to claim
1 , dadurch gekennzeichnet, daß die letzten, vorzugsweise drei Warmwalzstiche der Fertigwalzung auf einem Reversierwalzgerüst von Bund zu Bund im unkritischen Temperaturbereich von 260°-280°C nichtrekristallisierend ausgeführt werden und jedes aufgehaspelte Fertigbund unmittelbar im Anschluß daran und unter Ausnutzung der Walzhitze einem Bunddurchstoßofen zugeführt wird, in dem die Fertigbunde auf Rekristallisationstemperatur (315 320°) erwärmt werden.1, characterized in that the last, preferably three hot rolling passes of the finish rolling on a reversing roll stand from bundle to bundle are carried out non-recrystallizing in the uncritical temperature range of 260 ° -280 ° C and each coiled finished bundle is fed to a bundle piercing furnace immediately afterwards and using the rolling heat in which the finished bundles are heated to recrystallization temperature (315 320 °).
3. Anlage zur Durchführung eines Verfahrens zur Erzeugung von warmgewalztem AI-Dosenband, insbesondere in Walzanlagen mit Jahresproduktionskapazität unterhalb 250.000 1, mit einer reversierenden3. Plant for carrying out a process for the production of hot-rolled AI can strip, in particular in rolling plants with an annual production capacity below 250,000 1, with a reversing
Vorwalzung des warm eingesetzten Vormaterials und unmittelbar daran anschließender Fertigwalzung, der eine Wärmebehandlung des zu Bunden aufgehaspelten Bandes folgt, dadurch gekennzeichnet, daß die Fertigwalzung auf einem Quarto-Reversiergerüst (2) mit beidseitig angeordneten Aufwickelvorrichtungen (8,9) erfolgt, daß eine der Aufwickelvorrichtungen (9) mit einer Bundtransportvorrichtung (10) für das Fertigbund korrespondiert, die andererseits mit dem Bunddurchstoßofen (3) verbunden ist, in den das Bund (B) einführbar ist.Pre-rolling of the input material used warm and immediately following finishing rolling, which is followed by a heat treatment of the strip coiled into coils, characterized in that the finishing rolling takes place on a four-high reversing stand (2) with winding devices (8, 9) arranged on both sides, that one of the winding devices (9) with a coil transport device (10) for the Finished collar corresponds, which on the other hand is connected to the collar piercing furnace (3) into which the collar (B) can be inserted.
4. Anlage zur Durchführung eines Verfahrens zur Erzeugung von warmgewalztem AI-Dosenband nach Anspruch 3 dadurch gekennzeichnet, daß der Bunddurchstoßofen (3) mit einem Palettentransportsystem ausgestattet ist, bei dem mehrere aneinanderiiegende Paletten (11) die Bunde (B) aufnehmen, die durch Verschieben der Paletten (11) durch den Bunddurchstoßofen (3) transportierbar sind. 4. Plant for carrying out a method for producing hot-rolled AI can band according to claim 3, characterized in that the collar piercing furnace (3) is equipped with a pallet transport system in which a plurality of adjacent pallets (11) accommodate the bundles (B), which by moving the pallets (11) can be transported through the collar piercing furnace (3).
EP98932008A 1997-05-16 1998-04-22 Method and installation for producing hot rolled aluminium tape intended for can making Ceased EP0988405A1 (en)

Applications Claiming Priority (3)

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DE19721866A DE19721866B4 (en) 1997-05-16 1997-05-16 Process for the production of hot-rolled Al-tape and apparatus for carrying out the method
DE19721866 1997-05-16
PCT/DE1998/001162 WO1998053111A1 (en) 1997-05-16 1998-04-22 Method and installation for producing hot rolled aluminium tape intended for can making

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DE10349950A1 (en) * 2003-10-24 2005-05-25 Sms Demag Ag Rolling mill for warm rolling of metals, including a hot strip roll chain, and blooming and finishing roll chains useful in rolling Al
DE102004034090A1 (en) 2004-07-15 2006-02-02 Sms Demag Ag Rolling plant for rolling metallic material
DE102007016100A1 (en) * 2006-09-01 2008-03-06 Sms Demag Ag Device for keeping hot slabs emerging from a continuous casting plant
EP3875629A1 (en) 2020-03-03 2021-09-08 Elvalhalcor Hellenic Copper and Aluminium Industry S.A. Method and installation for producing aluminum can sheet
CN112077149B (en) * 2020-08-05 2022-08-19 首钢京唐钢铁联合有限责任公司 Control system for hot rolling heating furnace tapping rhythm

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DE19721866B4 (en) 2006-03-16
US20070062621A1 (en) 2007-03-22
US20020062889A1 (en) 2002-05-30
CA2289663A1 (en) 1998-11-26
DE19721866A1 (en) 1998-11-19
AU8207798A (en) 1998-12-11
JP2001525731A (en) 2001-12-11

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