EP2501498B1 - Cooling and cleaning of strip processing lines - Google Patents

Cooling and cleaning of strip processing lines Download PDF

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Publication number
EP2501498B1
EP2501498B1 EP20100796303 EP10796303A EP2501498B1 EP 2501498 B1 EP2501498 B1 EP 2501498B1 EP 20100796303 EP20100796303 EP 20100796303 EP 10796303 A EP10796303 A EP 10796303A EP 2501498 B1 EP2501498 B1 EP 2501498B1
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EP
European Patent Office
Prior art keywords
gas
liquid mixture
liquid
rolling
rolling material
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Not-in-force
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EP20100796303
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German (de)
French (fr)
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EP2501498A2 (en
Inventor
Arthur Allerdings
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SMS Group GmbH
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SMS Siemag AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/022—Cleaning travelling work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/06—Lubricating, cooling or heating rolls
    • B21B27/10—Lubricating, cooling or heating rolls externally
    • 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
    • B21B45/02—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 for lubricating, cooling, or cleaning
    • B21B45/0203—Cooling
    • B21B45/0209—Cooling devices, e.g. using gaseous coolants
    • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes

Definitions

  • the invention relates to the cooling and cleaning of components in rolling mills.
  • rolling plants are known from the prior art in which a liquid is used for cooling and / or for cleaning the rolls, the rolls and the rolling stock.
  • a liquid is usually used for the lubrication of a roll gap.
  • These are usually emulsions of water and oil.
  • Liquids, especially water have good heat-dissipating properties, which can be further increased by an initial temperature difference relative to the material to be cooled or by the flow rate of the liquids.
  • the cleaning properties are often given in a sufficient degree.
  • a disadvantage is the great moisture or moisture that is present as a result of this method in belt processing plants, especially in the rolling stand and on the rollers, or on the rolling stock.
  • an emulsion as such is that it usually has to have a temperature of at least 50 ° C to 60 ° C, so that it emulsifies sufficiently and has the desired lubricating properties. The necessarily higher temperature of the emulsion is opposed to the cooling. Furthermore, a constant filtration of the emulsion is usually necessary.
  • the international publication discloses WO 2005/120739 a method and a rolling mill for cold rolling of metallic rolling.
  • a nozzle for gaseous media are provided and installed on the other nozzle for liquid treatment media in the rolling stand.
  • individual nozzle rows are directed against the rolling gap or against the rolling stock for lubricating, cleaning and cooling.
  • a minimum quantity lubrication is used. This means that oil is applied in small quantities to the rolling stock.
  • the rolling stock usually has a surface roughness in the micrometer range and the amount, as described in the cited publication, is chosen so that just this roughness is compensated by a thin lubricant film.
  • cryogenic inert gas in particular liquid nitrogen.
  • cryogenic gases as nitrogen on a large scale is expensive. This is due, among other things, to the fact that they are required, on the one hand, in some considerable quantities, in the operation of such a plant and, in addition, cause increased costs for its storage, transport and occupational safety.
  • the publication WO 2009/029659 A1 discloses a method for cooling and cleaning a rolled strip according to the preamble of claim 1.
  • WO 03/051550 A1 discloses a method for cleaning a belt surface by means of two partial beams.
  • One of these rays preferably comprises a liquid, another jet preferably comprises a gas. Both beams are generated separately.
  • the publication WO 03/002277 A1 discloses a method and apparatus for cooling and lubricating rolls of a rolling mill. In this process, inter alia, oil-air mixtures or oil-water-air mixtures are applied as a lubricant.
  • the publication WO 2008/059321 A1 discloses a method and apparatus for cleaning metal bands.
  • two-phase jets are applied to the belt.
  • the patent US 4,344,308 discloses a method for cold rolling and for cleaning steel plates.
  • a cleaning solution is applied to the steel plate, into which also abrasive grains are mixed.
  • Such grains may be formed by iron phosphates, zinc phosphates, calcium phosphates, magnesium phosphates, sand iron powder, iron powder or iron oxides.
  • the invention uses gas and liquid cleaned and cooled at the same time.
  • the disadvantages of pure liquid cooling are overcome, with their biggest disadvantage is that it creates a large amount of moisture or moisture on the rolling or plant components, the quality of the rolling stock and its further processing, or the durability of the plants negative affected.
  • the strip flatness can be improved according to the invention, as can the mechanical properties, such as grain sizes or yield strengths.
  • an improvement in the strip surface produced is also possible, such as allowing for less roughness and greater cleanliness.
  • the process comprises solids in addition to the gas-liquid mixture. Ice crystals or solid phases of other gases or liquids which liquefy and / or evaporate on contact with the rolling stock can further increase the cleaning effect and / or the cooling effect.
  • the cleaning effect is enhanced by a ballistic effect, that is to say by the impact of the solids or particles on the surface of the rolling stock or of the plant component.
  • the phase transitions from solid to liquid and possibly from liquid to gaseous lead to additional temperature reductions of the material to be cooled by the necessary evaporation or sublimation heat in the phase transitions.
  • both the gas and the liquid of the gas-liquid mixture are co-exuded for cooling and cleaning.
  • both the gas and the liquid are applied from a common location to the rolling stock or to a part of the plant.
  • the gas-liquid mixture is emitted by means of a common nozzle or generally by means of a common outlet.
  • a common nozzle or generally by means of a common outlet may be provided.
  • the gas-liquid mixture stream reaches the rolling stock or the plant.
  • a fog out Liquid and gas are applied, that means in particular that are present in the gas droplets of the liquid.
  • air in particular compressed air
  • the cleaning effect and cooling effect can be further improved.
  • water, ethanol, kerosene or oil is used as the liquid of the gas-liquid mixture.
  • kerosene or ethanol increases the cooling and cleaning effect, since these substances evaporate quickly and require phase transformation heat, so that their phase transition from the liquid phase into the gaseous phase for the warm rolling or warm plant components, a significant temperature reduction occurs ,
  • the gas or air of the gas-liquid mixture is set in motion by a fan or a compressor. This can be controlled depending on the specific application, whether the mixture slowly moves in the form of a slowly moving mist on the corresponding material or in the form of a faster moving jet, in particular compressed air jet, meets the object to be cooled and cleaned.
  • a gas mixture is used as the gas of the gas-liquid mixture and / or a liquid mixture is used as the liquid.
  • a plurality of gases or liquids can also be used simultaneously for cooling and cleaning or can be flowed together, which, inter alia, by different phase transition temperatures of the liquids used a more uniform cooling of the material to be cooled can be achieved and not the entire liquid at a certain Temperature evaporates. The quality of the tape can be further increased.
  • the gas-liquid mixture optionally comprises one or more of the following components: gaseous nitrogen, liquid nitrogen, air, argon, water, demineralized water, oil, ethanol, kerosene.
  • the method is carried out in a rolling mill for rolling a metal strip, which comprises at least one pair of rollers or rollers between which the metal strip passes, wherein the cooling and the cleaning and possibly also the lubrication by the gas-liquid mixture on the inlet side a roller and / or on the outlet side of a roll, takes place on the inlet side of the roller pair and / or on the outlet side of the roller pair and / or below the metal strip and / or above the metal strip. Due to the good both cleaning and cooling properties of the method according to the invention, it can be found in particular in many places a rolling mill application. The methods known from the prior art do not allow such a flexible application.
  • the gas-liquid mixture is generated by accelerating the gas or the liquid subsequently introduced into a gas stream before it leaves a common outlet or a common nozzle.
  • FIG. 1 schematically shows an embodiment of the present invention.
  • this illustrated embodiment may not be construed restrictive but only the multiple uses of the method according to the invention should show purely by way of example.
  • outlets 1 to 10 for a gas-liquid mixture for cooling and cleaning a metal strip 17 and / or a rolling mill with rollers 12 to 15 and rollers 16 are shown.
  • the gas-liquid mixture is shown schematically by the black triangles or Sprühfowner.
  • a rolling stand 11 with two support rollers 12, 15 and intermediate work rolls 13, 14 is shown.
  • the work rolls 13, 14 exercise, as usual, a rolling force on the rolling stock 17, which is in accordance with the FIG. 1 moved from left to right.
  • the left side of the frame 11 corresponds to the inlet side of the frame 11, the right side of the frame 11 corresponds to the outlet side.
  • outlets 1 to 10 it is also conceivable to provide an outlet for the gas-liquid mixture only at one of the positions 1 to 10 shown.
  • the outlets 1 to 10 are provided for the gas-liquid mixture at other positions, as they are already known in rolling plants or in casting plants or other belt processing plants.
  • the gas-liquid mixture it is also possible for the gas-liquid mixture to be used for cleaning and cooling as well as possibly for lubrication and surface sealing of machining tools and / or other workpieces of the systems.
  • a gas-liquid mixture is simultaneously emitted through a plurality of said outlets. Regardless, however, it is preferably the case that the gas-liquid mixture is emitted from at least one outlet together.
  • An outlet can, for example, a nozzle be or an outlet opening of a spray bar.
  • the gas-liquid mixture can also be sprinkled or sprayed simultaneously from a row of nozzles, which preferably extends parallel to a roll axis or extends perpendicular to the rolling or casting direction.
  • the gas-liquid mixture may preferably be composed as follows:
  • As the gas of the gas-liquid mixture in particular air, optionally also under pressure, that is compressed air, may be used.
  • the air can be moved by a fan or a compressor.
  • As part of the liquid of the gas-liquid mixture in particular water, ethanol, kerosene or oil are used.
  • the gas-liquid mixture additionally contains solids, in the form of natural solids in the air, such as ice crystals. In addition, other added solids may be included.
  • a gas mixture may be used as the gas of the gas-liquid mixture and / or a liquid mixture may be used instead of a single liquid of the gas-liquid mixture.
  • Other gases and liquids or components or substances used can be, for example, gaseous nitrogen, liquid nitrogen, argon or demineralized water.
  • the construction of corresponding outlets which serve to carry out the method according to the invention is known to the person skilled in the art.
  • the method is applicable to both hot and cold rolling mills.

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  • Metal Rolling (AREA)

Description

Gebiet der ErfindungField of the invention

Die Erfindung betrifft die Kühlung und Reinigung von Komponenten in Walzanlagen.The invention relates to the cooling and cleaning of components in rolling mills.

Stand der TechnikState of the art

Einerseits sind aus dem Stand der Technik Walzanlagen bekannt, in denen zur Kühlung und / oder zur Reinigung der Walzen, der Rollen und des Walzgutes eine Flüssigkeit verwendet wird. Auch für die Schmierung eines Walzspaltes wird üblicherweise eine Flüssigkeit verwendet. Dies sind in der Regel Emulsionen aus Wasser und Öl. Flüssigkeiten, insbesondere Wasser, haben gute wärmeabführende Eigenschaften, die etwa durch eine anfängliche Temperaturdifferenz relativ zu dem zu kühlenden Material oder durch die Fließgeschwindigkeit der Flüssigkeiten weiter erhöht werden können. Auch die reinigenden Eigenschaften sind oft in einem ausreichenden Maß gegeben. Nachteilig ist allerdings die große Feuchtigkeit bzw. Nässe, die als Folge dieser Methode in Bandprozessanlagen, insbesondere im Walzgerüst und auf den Walzen, oder auf dem Walzgut vorliegt. Einerseits kann diese Nässe zu einer erhöhten Korrosion verschiedener Materialien führen und andererseits generell die Qualität des Walzgutes und dessen weitere Bearbeitung negativ beeinflussen. Ein weiterer Nachteil der Verwendung einer Emulsion als solcher ist, dass diese meist eine Temperatur von mindestens 50°C bis 60°C aufweisen muss, damit sie hinreichend emulgiert und die gewünschten Schmiereigenschaften aufweist. Auch die notwendigerweise höhere Temperatur der Emulsion steht der Kühlung entgegen. Desweiteren ist in der Regel eine ständige Filtrierung der Emulsion notwendig.On the one hand, rolling plants are known from the prior art in which a liquid is used for cooling and / or for cleaning the rolls, the rolls and the rolling stock. Also for the lubrication of a roll gap, a liquid is usually used. These are usually emulsions of water and oil. Liquids, especially water, have good heat-dissipating properties, which can be further increased by an initial temperature difference relative to the material to be cooled or by the flow rate of the liquids. Also, the cleaning properties are often given in a sufficient degree. A disadvantage, however, is the great moisture or moisture that is present as a result of this method in belt processing plants, especially in the rolling stand and on the rollers, or on the rolling stock. On the one hand, this wetness can lead to increased corrosion of various materials and on the other hand generally adversely affect the quality of the rolling stock and its further processing. Another disadvantage of using an emulsion as such is that it usually has to have a temperature of at least 50 ° C to 60 ° C, so that it emulsifies sufficiently and has the desired lubricating properties. The necessarily higher temperature of the emulsion is opposed to the cooling. Furthermore, a constant filtration of the emulsion is usually necessary.

So offenbart zum Beispiel die internationale Veröffentlichung WO 2005/120739 ein Verfahren sowie ein Walzgerüst zum Kaltwalzen von metallischem Walzgut. In dieser Vorrichtung sind zum einen Düsen für gasförmige Medien vorgesehen und zum anderen Düsen für flüssige Behandlungsmedien im Walzgerüst installiert. Insbesondere werden jeweils einzelne Düsenreihen zum Schmieren, Reinigen und Kühlen gegen den Walzspalt bzw. gegen das Walzgut gerichtet. In diesem Fall wird, zudem eine Minimalmengen-Schmierung eingesetzt. Das heißt, dass Öl in geringen Mengen auf das Walzgut aufgebracht wird. Dies kann so verstanden werden, dass das Walzgut in der Regel eine Oberflächenrauigkeit im Mikrometerbereich aufweist und die Menge, wie in der zitierten Veröffentlichung beschrieben, so gewählt wird, dass gerade diese Rauigkeit durch einen dünnen Schmiermittelfilm ausgeglichen wird. Die Mengen an verwendetem Öl pro Quadratmeter Walzgut liegen bekannterweise im Milligrammbereich. Diese geringen verwendeten Mengen können also weder der Kühlung noch der Reinigung des Produktes dienlich sein. Weiterhin schlägt die WO 2005/120739 vor, tiefkaltes Inertgas, insbesondere Flüssigstickstoff, aufzubringen. Allerdings ist die Verwendung solcher tiefkalten Gase wie Stickstoff im großindustriellen Maßstab teuer. Dies ist unter anderem darauf zurückzuführen, dass diese zum einen in teils erheblichen Mengen, im Betrieb einer solchen Anlage benötigt werden und zusätzlich erhöhte Kosten für dessen Lagerung, Transport und die Arbeitssicherheit verursachen.For example, the international publication discloses WO 2005/120739 a method and a rolling mill for cold rolling of metallic rolling. In this device, for a nozzle for gaseous media are provided and installed on the other nozzle for liquid treatment media in the rolling stand. In particular, individual nozzle rows are directed against the rolling gap or against the rolling stock for lubricating, cleaning and cooling. In this case, in addition, a minimum quantity lubrication is used. This means that oil is applied in small quantities to the rolling stock. This can be understood that the rolling stock usually has a surface roughness in the micrometer range and the amount, as described in the cited publication, is chosen so that just this roughness is compensated by a thin lubricant film. The quantities of oil used per square meter of rolling stock are known to be in the milligram range. These small amounts used can thus be neither the cooling nor the cleaning of the product useful. Furthermore, the beats WO 2005/120739 to apply cryogenic inert gas, in particular liquid nitrogen. However, the use of such cryogenic gases as nitrogen on a large scale is expensive. This is due, among other things, to the fact that they are required, on the one hand, in some considerable quantities, in the operation of such a plant and, in addition, cause increased costs for its storage, transport and occupational safety.

Bekannterweise wird in Walzanlagen auch reine Luft zur Reinigung verwendet. Die Luft ist dabei insbesondere hilfreich bei der Trocknung von Teilen der Einrichtung oder des Walzgutes. Nachteilig sind jedoch die schlechten wärmeabführenden Eigenschaften der Luft.As is known, pure air is used for cleaning in rolling plants. The air is particularly helpful in the drying of parts of the device or the rolling stock. However, the disadvantage is the poor heat-dissipating properties of the air.

Demnach sind zwar Verfahren zum Kühlen und Reinigen in Bandprozesslinien, insbesondere in Walzstraßen, aus dem Stand der Technik bekannt, diese weisen jedoch die oben beschrieben Nachteile auf.Accordingly, although methods for cooling and cleaning in strip processing lines, in particular in rolling mills, are known from the prior art, but these have the disadvantages described above.

Die Veröffentlichung WO 2009/029659 A1 offenbart ein Verfahren zum Kühlen und Reinigen eines Walzbandes gemäß dem Oberbegriff des Anspruchs 1.The publication WO 2009/029659 A1 discloses a method for cooling and cleaning a rolled strip according to the preamble of claim 1.

Die Veröffentlichung WO 03/051550 A1 offenbart ein Verfahren zum Reinigen einer Bandoberfläche mittels zweier Teilstrahlen. Einer diese Strahlen umfasst bevorzugt eine Flüssigkeit ein anderer Strahl umfasst bevorzugt ein Gas. Beide Strahlen werden separat erzeugt.The publication WO 03/051550 A1 discloses a method for cleaning a belt surface by means of two partial beams. One of these rays preferably comprises a liquid, another jet preferably comprises a gas. Both beams are generated separately.

Die Veröffentlichung US 2002/0162374 A1 offenbart ein Verfahren zum Kaltwalzen eines Metallbandes. Bei dem Verfahren wird unter anderem in einen Walzspalt eine Mischung zweier Phasen aus Gas und Flüssigkeit aufgebracht.The publication US 2002/0162374 A1 discloses a method for cold rolling a metal strip. In the method, inter alia, a mixture of two phases of gas and liquid is applied in a nip.

Die Veröffentlichung WO 03/002277 A1 offenbart ein Verfahren und eine Vorrichtung zum Kühlen und Schmieren von Walzen eines Walzgerüsts. Bei diesem Verfahren werden unter anderem Öl-Luft-Gemische oder Öl-Wasser-Luft-Gemische als Schmiermittel aufgebracht werden.The publication WO 03/002277 A1 discloses a method and apparatus for cooling and lubricating rolls of a rolling mill. In this process, inter alia, oil-air mixtures or oil-water-air mixtures are applied as a lubricant.

Die Veröffentlichung WO 2008/059321 A1 offenbart ein Verfahren und eine Vorrichtung zum Reinigen von Metallbändern. Insbesondere werden zweiphasige Düsenstrahlen auf das Band aufgebracht.The publication WO 2008/059321 A1 discloses a method and apparatus for cleaning metal bands. In particular, two-phase jets are applied to the belt.

Die Patentschrift US 4,344,308 offenbart ein Verfahren zum Kaltwalzen und zur Reinigung von Stahlplatten. Dabei wird eine Reinigungslösung auf die Stahlplatte aufgebracht, in die ebenfalls abrasive Körner gemischt werden. Solche Körner können durch Eisenphosphate, Zinkphosphate, Kalziumphosphate, Magnesiumphosphate, Sand-Eisenpulver, Eisenpulver oder Eisenoxide gebildet sein.The patent US 4,344,308 discloses a method for cold rolling and for cleaning steel plates. A cleaning solution is applied to the steel plate, into which also abrasive grains are mixed. Such grains may be formed by iron phosphates, zinc phosphates, calcium phosphates, magnesium phosphates, sand iron powder, iron powder or iron oxides.

Es stellt sich die technische Aufgabe, zumindest einen der oben genannten Nachteile zu überwinden oder die bekannten Verfahren weiterzuentwickeln.It has the technical task to overcome at least one of the above-mentioned disadvantages or to further develop the known methods.

Offenbarung der ErfindungDisclosure of the invention

Die vorliegende technische Aufgabe wird durch das erfindungsgemäße Verfahren gemäß Anspruch 1 gelöst. Im Gegensatz zu einigen der oben beschriebenen Verfahren aus dem Stand der Technik wird erfindungsgemäß mit Gas und Flüssigkeit gleichzeitig gereinigt und gekühlt. Dadurch entstehen mehrere Vorteile. Dadurch, dass Gas und Flüssigkeit gleichzeitig aufgebracht werden, wird der Nachteil einer Reinigung mit reiner Luft überwunden, da die gleichzeitig vorhandene Flüssigkeit gute Kühleigenschaften gewährleistet. Andererseits werden die Nachteile der reinen Flüssigkeitskühlung überwunden, wobei deren größter Nachteil dadurch gegeben ist, dass durch diese eine große Feuchtigkeitsmenge bzw. Nässe auf dem Walzgut oder den Anlagenkomponenten entsteht, die die Qualität des Walzguts und dessen weitere Bearbeitung, oder die Haltbarkeit der Anlagen negativ beeinflusst. Erfindungsgemäß kann insbesondere die Bandplanheit verbessert werden, wie auch die mechanischen Eigenschaften, wie Korngrößen oder Streckgrenzen. Zusätzlich ist ebenso eine Verbesserung der erzeugten Bandoberfläche möglich, wie etwa das Ermöglichen einer geringeren Rauigkeit und größeren Sauberkeit.The present technical problem is solved by the method according to claim 1. In contrast to some of the prior art methods described above, the invention uses gas and liquid cleaned and cooled at the same time. This creates several advantages. The fact that gas and liquid are applied simultaneously, the disadvantage of cleaning with clean air is overcome, since the coexisting liquid ensures good cooling properties. On the other hand, the disadvantages of pure liquid cooling are overcome, with their biggest disadvantage is that it creates a large amount of moisture or moisture on the rolling or plant components, the quality of the rolling stock and its further processing, or the durability of the plants negative affected. In particular, the strip flatness can be improved according to the invention, as can the mechanical properties, such as grain sizes or yield strengths. In addition, an improvement in the strip surface produced is also possible, such as allowing for less roughness and greater cleanliness.

Das Verfahren umfasst zusätzlich zum Gas-Flüssigkeits-Gemisch Festkörper. Eiskristalle oder feste Phasen anderer Gase oder Flüssigkeiten, die sich bei Berührung mit dem Walzgut verflüssigen und / oder verdampfen, können die Reinigungswirkung und / oder die Kühlwirkung weiter erhöhen. Zum einen wird die Reinigungswirkung durch einen ballistischen Effekt verstärkt, also durch das Auftreffen der Festkörper bzw. Partikel auf die Oberfläche des Walzguts oder des Anlagenbauteils. Zum anderen führen die Phasenübergänge von fest nach flüssig und gegebenenfalls von flüssig nach gasförmig zu zusätzlichen Temperaturerniedrigungen des zu kühlenden Materials durch die notwendigen Verdunstungs- bzw. Sublimationswärmen im Rahmen der Phasenübergänge.The process comprises solids in addition to the gas-liquid mixture. Ice crystals or solid phases of other gases or liquids which liquefy and / or evaporate on contact with the rolling stock can further increase the cleaning effect and / or the cooling effect. On the one hand, the cleaning effect is enhanced by a ballistic effect, that is to say by the impact of the solids or particles on the surface of the rolling stock or of the plant component. On the other hand, the phase transitions from solid to liquid and possibly from liquid to gaseous lead to additional temperature reductions of the material to be cooled by the necessary evaporation or sublimation heat in the phase transitions.

In einer vorteilhaften Ausgestaltung der Erfindung werden sowohl das Gas als auch die Flüssigkeit des Gas-Flüssigkeits-Gemischs gemeinsam zur Kühlung und Reinigung verströmt. Das bedeutet, dass sowohl das Gas als auch die Flüssigkeit von einem gemeinsamen Ort aus auf das Walzgut oder auf einen Teil der Anlage aufgebracht werden. Das heißt zum Beispiel, dass das Gas-Flüssigkeits-Gemisch mittels einer gemeinsamen Düse oder allgemein mit Hilfe eines gemeinsamen Auslasses verströmt wird. Natürlich können vorzugsweise auch mehrere solcher Düsen oder Auslässe vorgesehen sein. Von dort aus gelangt der Gas-Flüssigkeits-Gemisch-Strom auf das Walzgut bzw. die Anlage. Insbesondere kann so auch ein Nebel aus Flüssigkeit und Gas aufgebracht werden, das bedeutet insbesondere, dass sich in dem Gas Tröpfchen der Flüssigkeit befinden.In an advantageous embodiment of the invention, both the gas and the liquid of the gas-liquid mixture are co-exuded for cooling and cleaning. This means that both the gas and the liquid are applied from a common location to the rolling stock or to a part of the plant. This means, for example, that the gas-liquid mixture is emitted by means of a common nozzle or generally by means of a common outlet. Of course, preferably also several such nozzles or outlets may be provided. From there, the gas-liquid mixture stream reaches the rolling stock or the plant. In particular, so can a fog out Liquid and gas are applied, that means in particular that are present in the gas droplets of the liquid.

In einer weiteren bevorzugten Ausführungsform des Verfahrens wird als Gas des Gas-Flüssigkeits-Gemischs Luft, insbesondere Druckluft, verwendet. Durch die Verwendung von Druckluft kann die Reinigungswirkung und Kühlwirkung weiter verbessert werden.In a further preferred embodiment of the method, air, in particular compressed air, is used as the gas of the gas-liquid mixture. By using compressed air, the cleaning effect and cooling effect can be further improved.

In einer weiteren bevorzugten Ausführungsform des Verfahrens wird als Flüssigkeit des Gas-Flüssigkeits-Gemischs Wasser, Ethanol, Kerosin oder Öl verwendet. Insbesondere die Verwendung von Kerosin oder Ethanol erhöht die Kühl- und Reinigungswirkung, da diese Stoffe schnell verdampfen und dafür Phasenumwandlungswärme benötigen, so dass bei deren Phasenübergang von der flüssigen Phase in die gasförmige Phase für das warme Walzgut oder für die warmen Anlagenbauteile eine erhebliche Temperaturreduzierung auftritt.In a further preferred embodiment of the method, water, ethanol, kerosene or oil is used as the liquid of the gas-liquid mixture. In particular, the use of kerosene or ethanol increases the cooling and cleaning effect, since these substances evaporate quickly and require phase transformation heat, so that their phase transition from the liquid phase into the gaseous phase for the warm rolling or warm plant components, a significant temperature reduction occurs ,

In einer weiteren bevorzugten Ausführungsform des Verfahrens wird das Gas oder Luft des Gas-Flüssigkeits-Gemischs durch einen Ventilator oder einen Kompressor in Bewegung gebracht. Damit kann je nach konkreter Anwendung gesteuert werden, ob sich das Gemisch langsam in Form eines sich langsam bewegenden Nebels auf das entsprechende Material hinzu bewegt oder in Form eines sich schneller bewegenden Strahls, insbesondere Druckluftstrahls, auf das zu kühlende und zu reinigende Objekt trifft.In a further preferred embodiment of the method, the gas or air of the gas-liquid mixture is set in motion by a fan or a compressor. This can be controlled depending on the specific application, whether the mixture slowly moves in the form of a slowly moving mist on the corresponding material or in the form of a faster moving jet, in particular compressed air jet, meets the object to be cooled and cleaned.

In einer weiteren bevorzugten Ausführungsform des Verfahrens wird als Gas des Gas-Flüssigkeits-Gemischs ein Gasgemisch verwendet und / oder als Flüssigkeit ein Flüssigkeitsgemisch verwendet. Je nach Anwendung können auch mehrere Gase oder Flüssigkeiten gleichzeitig zur Kühlung und Reinigung eingesetzt werden bzw. gemeinsam verströmt werden, wodurch sich unter anderem durch unterschiedliche Phasenübergangstemperaturen der verwendeten Flüssigkeiten eine gleichmäßigere Abkühlung des zu kühlenden Materials erreicht werden kann und nicht die gesamte Flüssigkeit bei einer bestimmten Temperatur verdampft. Die Qualität des Bandes kann so weiter gesteigert werden.In a further preferred embodiment of the method, a gas mixture is used as the gas of the gas-liquid mixture and / or a liquid mixture is used as the liquid. Depending on the application, a plurality of gases or liquids can also be used simultaneously for cooling and cleaning or can be flowed together, which, inter alia, by different phase transition temperatures of the liquids used a more uniform cooling of the material to be cooled can be achieved and not the entire liquid at a certain Temperature evaporates. The quality of the tape can be further increased.

In einer weiteren bevorzugten Ausführungsform des Verfahrens umfasst das Gas-Flüssigkeits-Gemisch wahlweise eine oder mehrere der folgenden Komponenten: gasförmigen Stickstoff, flüssigen Stickstoff, Luft, Argon, Wasser, vollentsalztes Wasser, Öl, Ethanol, Kerosin.In a further preferred embodiment of the method, the gas-liquid mixture optionally comprises one or more of the following components: gaseous nitrogen, liquid nitrogen, air, argon, water, demineralized water, oil, ethanol, kerosene.

In einer Ausführungsform wird das Verfahren in einer Walzanlage zum Walzen eines Metallbandes durchgeführt, welche mindestens ein Rollenpaar oder Walzenpaar umfasst zwischen dem das Metallband hindurch läuft, wobei die Kühlung und die Reinigung sowie eventuell auch die Schmierung durch das Gas-Flüssigkeits-Gemisch auf der Einlaufseite einer Rolle und / oder auf der Auslaufseite einer Rolle, auf der Einlaufseite des Rollenpaars und / oder auf der Auslaufseite des Rollenpaars erfolgt und / oder unterhalb des Metallbandes und / oder oberhalb des Metallbandes erfolgt. Durch die guten sowohl reinigenden als auch kühlenden Eigenschaften des erfindungsgemäßen Verfahrens kann es insbesondere an vielerlei Stellen einer Walzanlage Anwendung finden. Die aus dem Stand der Technik bekannten Verfahren ermöglichen keine derart flexible Anwendung.In one embodiment, the method is carried out in a rolling mill for rolling a metal strip, which comprises at least one pair of rollers or rollers between which the metal strip passes, wherein the cooling and the cleaning and possibly also the lubrication by the gas-liquid mixture on the inlet side a roller and / or on the outlet side of a roll, takes place on the inlet side of the roller pair and / or on the outlet side of the roller pair and / or below the metal strip and / or above the metal strip. Due to the good both cleaning and cooling properties of the method according to the invention, it can be found in particular in many places a rolling mill application. The methods known from the prior art do not allow such a flexible application.

In einer weiteren bevorzugten Ausführungsform des Verfahrens wird das Gas-Flüssigkeits-Gemisch durch Beschleunigung des Gases erzeugt oder die Flüssigkeit nachträglich in einen Gasstrom eingeleitet bevor es einen gemeinsamen Auslass oder eine gemeinsame Düse verlässt.In a further preferred embodiment of the method, the gas-liquid mixture is generated by accelerating the gas or the liquid subsequently introduced into a gas stream before it leaves a common outlet or a common nozzle.

Kurze Beschreibung der FigurenBrief description of the figures

Im Folgenden wird kurz eine Figur eines Ausführungsbeispiels beschrieben. Weitere Details sind der detaillierten Beschreibung der Ausführungsbeispiele zu entnehmen.

Figur 1
zeigt schematisch ein Ausführungsbeispiel des erfindungsgemäßen Verfahrens, wobei an mehreren Stellen einer Walzanlage gleichzeitig ein Gas-Flüssigkeits-Gemisch verströmt wird.
In the following, a figure of an embodiment will be briefly described. Further details can be found in the detailed description of the embodiments.
FIG. 1
schematically shows an embodiment of the method according to the invention, wherein at several points of a rolling mill at the same time a gas-liquid mixture is emitted.

Detaillierte Beschreibung der AusführungsbeispieleDetailed description of the embodiments

Figur 1 zeigt schematisch ein Ausführungsbeispiel der vorliegenden Erfindung. Zunächst sei festgestellt, dass dieses dargestellte Ausführungsbeispiel nicht einschränkend verstanden werden darf sondern nur die vielfachen Einsatzmöglichkeiten des erfindungsgemäßen Verfahrens rein beispielhaft aufzeigen soll. FIG. 1 schematically shows an embodiment of the present invention. First, it should be noted that this illustrated embodiment may not be construed restrictive but only the multiple uses of the method according to the invention should show purely by way of example.

Insbesondere sind in der Abbildung mehrere Auslässe 1 bis 10 für ein Gas-Flüssigkeits-Gemisch zur Kühlung und Reinigung eines Metallbandes 17 und / oder einer Walzanlage mit Walzen 12 bis 15 und Rollen 16 abgebildet. Das Gas-Flüssigkeits-Gemisch ist schematisch durch die schwarzen Dreiecke bzw. Sprühfächer dargestellt. Im Ausführungsbeispiel ist insbesondere ein Walzgerüst 11 mit zwei Stützwalzen 12, 15 und dazwischen liegenden Arbeitswalzen 13, 14 dargestellt. Die Arbeitswalzen 13, 14 üben, wie üblich, eine Walzkraft auf das Walzgut 17 aus, das sich gemäß der Figur 1 von links nach rechts bewegt. Die linke Seite des Gerüsts 11 entspricht der Einlaufseite des Gerüsts 11, die rechte Seite des Gerüsts 11 entspricht der Auslaufseite.In particular, in the figure, several outlets 1 to 10 for a gas-liquid mixture for cooling and cleaning a metal strip 17 and / or a rolling mill with rollers 12 to 15 and rollers 16 are shown. The gas-liquid mixture is shown schematically by the black triangles or Sprühfächer. In the exemplary embodiment, in particular a rolling stand 11 with two support rollers 12, 15 and intermediate work rolls 13, 14 is shown. The work rolls 13, 14 exercise, as usual, a rolling force on the rolling stock 17, which is in accordance with the FIG. 1 moved from left to right. The left side of the frame 11 corresponds to the inlet side of the frame 11, the right side of the frame 11 corresponds to the outlet side.

Trotz der Vielzahl an dargestellten Auslässen 1 bis 10 ist es auch denkbar, nur an einer der gezeigten Positionen 1 bis 10 einen Auslass für das Gas-Flüssigkeits-Gemisch vorzusehen. Es ist aber darüberhinaus auch möglich, dass die Auslässe 1 bis 10 für das Gas-Flüssigkeits-Gemisch an anderen Positionen vorgesehen sind, wie sie bereits üblicherweise in Walzanlagen oder auch in Gießanlagen oder sonstigen Bandprozessanlagen bekannt sind. Es ist auch möglich, dass das Gas-Flüssigkeits-Gemisch zur Reinigung und Kühlung sowie eventuell zur Schmierung und Oberflächenversiegelung von Bearbeitungswerkzeugen und / oder anderen Werkstücken der Anlagen eingesetzt werden. Es ist insbesondere ebenso möglich, dass durch mehrere der genannten Auslässe gleichzeitig ein Gas-Flüssigkeits-Gemisch verströmt wird. Unabhängig davon ist es jedoch bevorzugt der Fall, dass das Gas-Flüssigkeits-Gemisch aus mindestens einem Auslass gemeinsam verströmt wird. Ein Auslass kann dabei zum Beispiel eine Düse sein oder auch eine Auslassöffnung eines Spritzbalkens. Das Gas-Flüssigkeits-Gemisch kann auch gleichzeitig aus einer Düsenreihe verströmt bzw. versprüht werden, die sich vorzugsweise parallel zu einer Walzenachse erstreckt bzw. sich senkrecht zur Walz- bzw. Gießrichtung erstreckt.Despite the large number of outlets 1 to 10 shown, it is also conceivable to provide an outlet for the gas-liquid mixture only at one of the positions 1 to 10 shown. However, it is also possible that the outlets 1 to 10 are provided for the gas-liquid mixture at other positions, as they are already known in rolling plants or in casting plants or other belt processing plants. It is also possible for the gas-liquid mixture to be used for cleaning and cooling as well as possibly for lubrication and surface sealing of machining tools and / or other workpieces of the systems. It is also possible, in particular, that a gas-liquid mixture is simultaneously emitted through a plurality of said outlets. Regardless, however, it is preferably the case that the gas-liquid mixture is emitted from at least one outlet together. An outlet can, for example, a nozzle be or an outlet opening of a spray bar. The gas-liquid mixture can also be sprinkled or sprayed simultaneously from a row of nozzles, which preferably extends parallel to a roll axis or extends perpendicular to the rolling or casting direction.

Das Gas-Flüssigkeits-Gemisch kann bevorzugt wie folgt zusammengesetzt sein: Als Gas des Gas-Flüssigkeits-Gemischs kann insbesondere Luft, optional auch unter Druck, das heißt Druckluft, verwendet werden. Die Luft kann dabei durch einen Ventilator oder einen Kompressor in Bewegung gebracht werden. Als Bestandteil der Flüssigkeit des Gas-Flüssigkeits-Gemischs finden insbesondere Wasser, Ethanol, Kerosin oder Öl Verwendung. Das Gas-Flüssigkeits-Gemisch enthält zusätzlich Festkörper bzw. Feststoffe, in Form natürlicher Feststoffe der Luft, wie zum Beispiel Eiskristalle. Zusätzlich können auch andere zugesetzte Feststoffe enthalten sein. Darüberhinaus kann als Gas des Gas-Flüssigkeits-Gemischs ein Gasgemisch verwendet werden und / oder anstelle einer einzelnen Flüssigkeit des Gas-Flüssigkeits-Gemischs ein Flüssigkeitsgemisch verwendet werden. Weitere verwendete Gase und Flüssigkeiten, bzw. Komponenten oder Stoffe können zum Beispiel gasförmiger Stickstoff, flüssiger Stickstoff, Argon oder vollentsalztes Wasser sein. Die Konstruktion entsprechender Auslässe, die zur Durchführung erfindungsgemäßen des Verfahrens dienen, ist dem Fachmann bekannt.The gas-liquid mixture may preferably be composed as follows: As the gas of the gas-liquid mixture, in particular air, optionally also under pressure, that is compressed air, may be used. The air can be moved by a fan or a compressor. As part of the liquid of the gas-liquid mixture, in particular water, ethanol, kerosene or oil are used. The gas-liquid mixture additionally contains solids, in the form of natural solids in the air, such as ice crystals. In addition, other added solids may be included. Moreover, a gas mixture may be used as the gas of the gas-liquid mixture and / or a liquid mixture may be used instead of a single liquid of the gas-liquid mixture. Other gases and liquids or components or substances used can be, for example, gaseous nitrogen, liquid nitrogen, argon or demineralized water. The construction of corresponding outlets which serve to carry out the method according to the invention is known to the person skilled in the art.

Insbesondere, aber nicht ausschließlich, ist das Verfahren sowohl für Warm- als auch für Kaltwalzstraßen anwendbar.In particular, but not exclusively, the method is applicable to both hot and cold rolling mills.

Claims (7)

  1. Method of cooling and cleaning in a rolling plant, wherein components of the plant (11, 12, 13, 14, 15) are cooled and cleaned at the same time by a gas-liquid mixture and both the gas and the liquid of the gas-liquid mixture are caused to flow through a common outlet (3, 4, 5, 6, 7, 8) for the cooling and cleaning,
    characterised in that
    the gas-liquid mixture additionally contains a solid phase of air, particularly ice crystals; and
    - the common outlet (3) on the inlet side of a roll stand (11) is arranged above the rolling material (17) and is directed towards working rolls (13) above the rolling material (17), or
    - the common outlet (4) on the inlet side of a roll stand (11) is arranged below the rolling material (17) and directed towards working rolls (14) below the rolling material (17), or
    - the common outlet (5, 6) on the outlet side of a roll stand (11) above or below the rolling material (17) is directed onto a rolling gap of the rolling plant, or
    - the common outlet (7) on the outlet side of a roll stand (11) above the rolling material (17) is directed onto a working roll (13) arranged above the rolling material (17) and onto a backing roll (12) arranged above the rolling material (17), or
    - the common outlet (8) on the outlet side of a roll stand (11) below the rolling material (17) is directed onto a working roll (14) arranged below the rolling material (17) and onto a backing roll (15) arranged above the rolling material.
  2. Method according to claim 1, wherein air, particularly compressed air, is used as the gas of the gas-liquid mixture.
  3. Method according to claim 1, wherein water, ethanol, kerosene or oil is used as the liquid of the gas-liquid mixture.
  4. Method according to claim 1, wherein the gas of the gas-liquid mixture is set in motion by a fan or a compressor.
  5. Method according to any one of the preceding claims, wherein a gas mixture is used as the gas of the gas-liquid mixture or a liquid mixture is used as the liquid.
  6. Method according to claim 1 or 5, wherein the gas-liquid mixture comprises a plurality of the following components: gaseous nitrogen, liquid nitrogen, air, argon, water, deionised water, oil, ethanol, kerosene.
  7. Method according to claim 1, wherein the gas-liquid mixture is produced by accelerating the gas or the liquid is subsequently introduced into a gas flow before the gas-liquid mixture in common leaves an outlet (3, 4, 5, 6, 7, 8).
EP20100796303 2009-11-21 2010-11-16 Cooling and cleaning of strip processing lines Not-in-force EP2501498B1 (en)

Applications Claiming Priority (2)

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DE200910054205 DE102009054205A1 (en) 2009-11-21 2009-11-21 Cooling and cleaning in belt processing lines
PCT/EP2010/067526 WO2011061165A2 (en) 2009-11-21 2010-11-16 Cooling and cleaning of strip processing lines

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EP2501498A2 EP2501498A2 (en) 2012-09-26
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DE102011104452A1 (en) 2011-06-08 2012-12-13 Schletter Gmbh Stand for photovoltaic module, has adjustment device engaged in open longitudinal channel, connected with horizontal hinge pin and defined transverse to beam by opposite side walls of open longitudinal channel
DE102011104455B4 (en) 2011-06-08 2013-01-03 Schletter Gmbh Assembly of a stand for PV modules, holding attachment and method for assembling the assembly
CN102284518A (en) * 2011-08-18 2011-12-21 中冶南方工程技术有限公司 Water mist spraying device used in cold-rolling wet leveling production
GB2495512B (en) * 2011-10-12 2013-12-11 Siemens Plc Rolling apparatus
CN104438382B (en) * 2014-11-25 2016-08-24 山东钢铁股份有限公司 A kind of method improving surface cleanness of cold rolled strip steel and special equipment thereof
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JPS5841923B2 (en) * 1979-07-25 1983-09-16 日本パ−カライジング株式会社 Steel plate cleaning method
US6675622B2 (en) * 2001-05-01 2004-01-13 Air Products And Chemicals, Inc. Process and roll stand for cold rolling of a metal strip
DE10131369A1 (en) * 2001-06-28 2003-01-09 Sms Demag Ag Method and device for cooling and lubricating rolls of a roll stand
AUPR949801A0 (en) * 2001-12-14 2002-01-24 Industrial Automation Services Pty Ltd Process control method and apparatus
DE102004040375A1 (en) 2004-06-09 2005-12-29 Sms Demag Ag Method and rolling stand for cold rolling of metallic rolling stock, in particular of rolled strip, with nozzles for gaseous or liquid treatment media
ITMI20062189A1 (en) * 2006-11-15 2008-05-16 Comodo Italia S R L FURNISHING STRUCTURE FOR THE ASSEMBLY OF AT LEAST ONE PORSONA IN THE ASSISA POSITION E-O SHAPED AND PROCEDURE FOR THE CHANGE OF ITS CONFIGURATION
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WO2011061165A3 (en) 2012-06-14
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EP2501498A2 (en) 2012-09-26

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