EP0695590A1 - Method and device for cooling hot-rolled metal plates and strips - Google Patents

Method and device for cooling hot-rolled metal plates and strips Download PDF

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Publication number
EP0695590A1
EP0695590A1 EP95810449A EP95810449A EP0695590A1 EP 0695590 A1 EP0695590 A1 EP 0695590A1 EP 95810449 A EP95810449 A EP 95810449A EP 95810449 A EP95810449 A EP 95810449A EP 0695590 A1 EP0695590 A1 EP 0695590A1
Authority
EP
European Patent Office
Prior art keywords
water
strips
nozzle
air
flat jet
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.)
Granted
Application number
EP95810449A
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German (de)
French (fr)
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EP0695590B1 (en
Inventor
Miroslaw Plata
Malcom Hill
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
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Filing date
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Publication of EP0695590A1 publication Critical patent/EP0695590A1/en
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0861—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with one single jet constituted by a liquid or a mixture containing a liquid and several gas jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0884—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point the outlet orifices for jets constituted by a liquid or a mixture containing a liquid being aligned
    • 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
    • B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
    • 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
    • C21D1/62—Quenching devices
    • C21D1/667—Quenching devices for spray quenching
    • 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 and a device for cooling hot-rolled plates and strips made of metal, in particular of aluminum or an aluminum alloy, a hot-rolled strip being cut into plates or strips immediately after it emerges from a hot rolling mill.
  • a hot rolling strip usually has a temperature in the range between approximately 300 and 500 ° C. when it exits a hot rolling mill. To produce plates, these are cut immediately after the hot-rolled strip emerges from the hot rolling mill. Since there is no suitable sealing material for vacuum suction cups that can be used at temperatures above 300 ° C, the hot plates must be removed from the roller table for stacking with gripping tools. This handling of the plates is labor-intensive on the one hand, and on the other hand unwanted traces of the gripping tools can remain on the surface of the plates. A rapid cooling of the plates could in principle take place through the roller emulsion when carrying out empty runs without stitch acceptance. The resulting large temperature differences on the hot rolled strip would lead to unacceptable deviations from the flatness of the plates.
  • EP-A-0 578 607 discloses an inline method for cooling profiles emerging from an extrusion press, in which the spray nozzles known from EP-A-0 343 103 are installed in modules.
  • the inventors have set themselves the task of creating a method and a device of the type mentioned at the outset, with which plates and strips can be checked and cooled as quickly as possible to a temperature of at most about 250 ° C. without the plates Flatness deviations occur.
  • the plates or strips continuously pass through a cooling station immediately after being cut to length, and water is directly applied to them in the flat jet nozzles, the water jet emerging from the flat jet nozzles essentially directed towards the plate or strip surface Forms a plane and the water jet is deflected periodically by air or water jets immediately after it emerges from the flat jet nozzle in such a way that the water jet striking the plate or strip surface performs a wiping movement.
  • the water jet emerging from the flat jet nozzle is preferably pivoted through an angle in a range between 30 and 120 °.
  • the distance from the outlet opening of the flat jet nozzle to the plate or strip surface is preferably set to approximately 100 to 200 mm.
  • the impact surface of the water jet on the plate or strip surface preferably has a width of approximately 5 to 10 mm, the length: width ratio being between approximately 5: 1 and 100: 1.
  • a frequency for the wiping movement which is suitable for the method according to the invention is between approximately 0.1 and 20 Hz.
  • the wiping movement is preferably carried out at a frequency of approximately 0.5 to 2 Hz.
  • the flat jet nozzles are arranged on nozzle strips running in the running direction of the plates or strips.
  • the nozzle strips preferably comprise a longitudinal water channel and two longitudinal air channels, branch channels branching from the water channel to the flat jet nozzles and the air channels ending in air gaps directed towards the nozzle outlet openings.
  • the nozzle strips can be separated into water-feedable modules be divided or built up from such modules.
  • the nozzle strips or modules have a preferably extruded base body, in which the flat jet nozzles are interchangeably inserted.
  • covers which form an air chamber, are preferably placed on the base body with an air gap directed at the nozzle outlet openings, and the air chambers are connected to the air channels via connecting channels.
  • a hot rolling strip 12 emerges from a hot rolling mill 10, which is cut into plates 16 by means of scissors or saw 14 and is moved via a roller table 18 in the transport direction x through a cooling station 20.
  • the in the Cooling station 20 cooled plates 16 are temporarily stored as a stack 22 until further processing.
  • a cut hot rolling strip 12a passes through the cooling station 20, which is arranged here in front of the tandem mill stand 21 of a finishing train.
  • a reversing stand could also be used.
  • lower and upper nozzle strips 24 are arranged inside the cooling station 20 in the plate or tape transport direction x. 3 and 4, modules 26 with three flat jet nozzles 52 are shown.
  • the nozzle outlet openings 53 visible from the flat jet nozzles 52 which are at a distance of, for example, 150 mm from the surface 32 of the plate 16 or the band 12a, are arranged at regular intervals of, for example, 100 to 200 mm.
  • Covers 34, 36 for air chambers 38, 40 are visible on both sides adjacent to the nozzle outlet openings 52.
  • Additional water nozzles 60 are optionally provided. These water nozzles 60 are then switched on when the cooling effect of the flat jet nozzles 52 is inadequate in the case of thicker plates 16 or belts 12a at the predetermined transport speed.
  • the modules 26 With their end faces 27 directly adjacent to one another or lined up at a short distance from one another, the modules 26 form the lower and upper nozzle strips 24. Each module 26 can be fed separately with water and air. As can be seen in particular from FIG. 5, the module 26 has a preferably extruded base body 42 with a longitudinal central water channel 46 and longitudinal air channels 48, 50 arranged on both sides of the water channel 46.
  • the air channels 48, 50 are connected to air chambers 38, 40 via connecting channels 62, 64.
  • These air chambers 38, 40 are formed by covers 34, 36 screwed to the base body 42. Between the cover 34, 36 and the by about 45 ° An inclined surface of the base body 42 is an air gap 54, 56 directed toward the nozzle outlet opening 53.
  • the water channel 46 is connected to the flat jet nozzles 52 via branch channels 58. If required, the additional water nozzles 60 are supplied via a further water channel, not shown in the drawing.
  • the air pressure ratios for the two air jets A, B as a function of time t are shown in FIGS. 6 and 7.
  • the air pressure p is set in each case in the corresponding air duct 48 or 50.
  • the water jet W is first deflected from its normal position by the first air jet A to the maximum and returned to the normal position. Now the water jet W is deflected by the second air jet B in the other direction to the maximum deflection and then back to the normal position.
  • This mutual periodic deflection with a period T takes place, for example, at a frequency of approximately 1 Hz.
  • the air jets A and B for deflecting the water jet W can in principle be replaced by water jets, in which case the total amount of water composed of the water jet W and the deflecting water jets is preferably kept constant.
  • the wiping movement of the water jet W emerging from the flat jet nozzles 52 runs transversely to the transport direction x of the plates 16 or the belt 12a, successive nozzles each carrying out opposite wiping movements.
  • the length 1 of the impact surface 30 of the water jet W on the surface 32 of the plates 16 or the band 12a is, for example, 200 mm, the width b, for example, 5 mm.
  • the flat jet nozzles 52 are arranged in the nozzle strips 24 or modules 26 in such a way that the impingement surfaces 30 of adjacent water jets W approximately touch during the wiping movement.

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

Abstract

Hot rolled strip or plate is passed beneath banks of water spray nozzles (26) which each produce a spray pattern (30) on the surface of the strip. As the water leaves the nozzle it is subjected to lateral air or water spray beams (A, B) which periodically deflect the main spray back and forth across the width of the strip.

Description

Die Erfindung betrifft ein Verfahren sowie eine Vorrichtung zum Kühlen von warmgewalzten Platten und Bändern aus Metall, insbesondere aus Aluminium oder einer Aluminiumlegierung, wobei ein warmgewalztes Band unmittelbar nach seinem Austritt aus einem Warmwalzwerk zu Platten oder Bändern abgelängt wird.The invention relates to a method and a device for cooling hot-rolled plates and strips made of metal, in particular of aluminum or an aluminum alloy, a hot-rolled strip being cut into plates or strips immediately after it emerges from a hot rolling mill.

Ein Warmwalzband weist bei seinem Austritt aus einem Warmwalzwerk üblicherweise eine Temperatur im Bereich zwischen etwa 300 und 500°C auf. Zur Herstellung von Platten werden diese unmittelbar nach dem Austritt des warmgewalzten Bandes aus dem Warmwalzwerk zugeschnitten. Da es kein geeignetes Dichtungsmaterial für Vakuumsaugnäpfe gibt, das bei Temperaturen oberhalb von 300°C eingesetzt werden kann, müssen die heissen Platten zum Stapeln mit Greifwerkzeugen vom Rollgang genommen werden. Dieses Handling der Platten ist einerseits personalintensiv, andererseits können auf der Plattenoberfläche unerwünschte Spuren von den Greifwerkzeugen zurückbleiben. Eine rasche Abkühlung der Platten könnte zwar grundsätzlich durch die Walzemulsion bei Durchführung von Leerdurchgängen ohne Stichabnahme erfolgen. Die daraus resultierenden grossen Temperaturdifferenzen am Warmwalzband würden jedoch zu unakzeptablen Abweichungen von der Planheit der Platten führen.A hot rolling strip usually has a temperature in the range between approximately 300 and 500 ° C. when it exits a hot rolling mill. To produce plates, these are cut immediately after the hot-rolled strip emerges from the hot rolling mill. Since there is no suitable sealing material for vacuum suction cups that can be used at temperatures above 300 ° C, the hot plates must be removed from the roller table for stacking with gripping tools. This handling of the plates is labor-intensive on the one hand, and on the other hand unwanted traces of the gripping tools can remain on the surface of the plates. A rapid cooling of the plates could in principle take place through the roller emulsion when carrying out empty runs without stitch acceptance. The resulting large temperature differences on the hot rolled strip would lead to unacceptable deviations from the flatness of the plates.

Oftmals ist es auch vorteilhaft, zum Weiterwalzen eines warmgewalzten Bandes dieses beim Einführen in das Tandemgerüst einer Fertigstrasse oder in ein Reversiergerüst abzukühlen. Dabei ist es wichtig, dass am Band keine Planheitsabweichungen auftreten.It is often also advantageous to cool a hot-rolled strip further when it is introduced into the tandem stand of a finishing train or into a reversing stand. It is important that there are no flatness deviations on the belt.

Aus der EP-A-0 343 103 ist ein Verfahren zum Kühlen von Pressprofilen und Walzbändern bekannt, bei welchen mittels Spraydüsen ein Wassernebel erzeugt wird. Dieses Verfahren ist jedoch für das rasche Inline-Kühlen von Warmwalzplatten einer Dicke von mehr als etwa 5 mm wegen des zu geringen Wärmeübergangs nicht geeignet. Dieses vorbekannte Kühlverfahren mittels Spraydüsen ist in der EP-A-0 429 394 zum Kühlen gegossener Metallstränge beschrieben.From EP-A-0 343 103 a method for cooling pressed profiles and rolled strips is known, in which by means of spray nozzles a water mist is generated. However, this method is not suitable for the rapid inline cooling of hot rolled plates with a thickness of more than about 5 mm because of the insufficient heat transfer. This known cooling method using spray nozzles is described in EP-A-0 429 394 for cooling cast metal strands.

In der EP-A-0 578 607 ist ein Inline-Verfahren zum Kühlen von aus einer Strangpresse austretenden Profilen offenbart, bei welchem die aus der EP-A-0 343 103 bekannten Spraydüsen in Module eingebaut sind.EP-A-0 578 607 discloses an inline method for cooling profiles emerging from an extrusion press, in which the spray nozzles known from EP-A-0 343 103 are installed in modules.

Angesichts dieser Gegebenheiten haben sich die Erfinder die Aufgabe gestellt, ein Verfahren sowie eine Vorrichtung der eingangs erwähnten Art zu schaffen, mit welchem Platten und Bänder kontrolliert und möglichst rasch auf eine Temperatur von maximal etwa 250°C abgekühlt werden können, ohne dass an den Platten Planheitsabweichungen auftreten.In view of these circumstances, the inventors have set themselves the task of creating a method and a device of the type mentioned at the outset, with which plates and strips can be checked and cooled as quickly as possible to a temperature of at most about 250 ° C. without the plates Flatness deviations occur.

Zur erfindungsgemässen Lösung der Aufgabe führt beim Verfahren, dass die Platten oder Bänder unmittelbar nach dem Ablängen kontinuierlich eine Kühlstation durchlaufen und in dieser über Flachstrahldüsen direkt mit Wasser beaufschlagt werden, wobei der aus den Flachstrahldüsen austretende Wasserstrahl im wesentlichen eine auf die Platten- oder Bandoberfläche gerichtete Ebene bildet und der Wasserstrahl unmittelbar nach seinem Austritt aus der Flachstrahldüse mittels Luft oder Wasserstrahlen periodisch derart abgelenkt wird, dass der auf die Platten- oder Bandoberfläche auftreffende Wasserstrahl eine Wischbewegung ausführt.To achieve the object according to the invention in the method, the plates or strips continuously pass through a cooling station immediately after being cut to length, and water is directly applied to them in the flat jet nozzles, the water jet emerging from the flat jet nozzles essentially directed towards the plate or strip surface Forms a plane and the water jet is deflected periodically by air or water jets immediately after it emerges from the flat jet nozzle in such a way that the water jet striking the plate or strip surface performs a wiping movement.

Spezielle und weiterführende Ausführungsarten des erfindungsgemässen Verfahrens und der Vorrichtung sind Gegenstand von abhängigen Patentansprüchen.Special and further embodiments of the method and device according to the invention are the subject of dependent patent claims.

Mit dem erfindungsgemässen 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. Die Inline-Abkühlung der Platten oder Bänder auf eine Temperatur von weniger als 300°C führt zu einer erhebli-chen Produktionssteigerung. Zudem können Platten nach dem Durchlaufen der Kühlstation mit konventionellen Vakuumsystemen vom Rollgang genommen und gestapelt werden.With the use of flat jet nozzles according to the invention, 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 even heat removal. The inline cooling of the plates or strips to a temperature of less than 300 ° C leads to a significant increase in production. After passing through the cooling station, plates can also be removed from the roller table and stacked using conventional vacuum systems.

Zur Ausführung der Wischbewegung wird der aus der Flachstrahldüse austretende Wasserstrahl bevorzugt um einen Winkel in einem Bereich zwischen 30 und 120° geschwenkt.To carry out the wiping movement, the water jet emerging from the flat jet nozzle is preferably pivoted through an angle in a range between 30 and 120 °.

Der Abstand von der Austrittsöffnung der Flachstrahldüse zur Platten- oder Bandoberfläche wird bevorzugt auf etwa 100 bis 200 mm eingestellt.The distance from the outlet opening of the flat jet nozzle to the plate or strip surface is preferably set to approximately 100 to 200 mm.

Die Auftreffläche des Wasserstrahls auf der Platten- oder Bandoberfläche weist eine vorzugsweise Breite von etwa 5 bis 10 mm auf, wobei das Verhältnis Länge: Breite zwischen etwa 5 : 1 und 100 : 1 liegt.The impact surface of the water jet on the plate or strip surface preferably has a width of approximately 5 to 10 mm, the length: width ratio being between approximately 5: 1 and 100: 1.

Eine für das erfindungsgemässe Verfahren geeignete Frequenz für die Wischbewegung liegt zwischen etwa 0,1 und 20 Hz. Bevorzugt wird die Wischbewegung mit einer Frequenz von etwa 0,5 bis 2 Hz ausgeführt.A frequency for the wiping movement which is suitable for the method according to the invention is between approximately 0.1 and 20 Hz. The wiping movement is preferably carried out at a frequency of approximately 0.5 to 2 Hz.

Bei einer zur Durchführung des erfindungsgemässen Verfahrens mit Flachstrahldüsen bevorzugten Vorrichtung sind die Flachstrahldüsen auf in Laufrichtung der Platten oder Bänder verlaufenden Düsenleisten angeordnet. Bevorzugt umfassen die Düsenleisten einen längslaufenden Wasserkanal und zwei längslaufende Luftkanäle, wobei vom Wasserkanal Stichkanäle zu den Flachstrahldüsen abzweigen und die Luftkanäle in auf die Düsenaustrittsöf fnungen gerichteten Luftspalten enden.In a device preferred for carrying out the method according to the invention with flat jet nozzles, the flat jet nozzles are arranged on nozzle strips running in the running direction of the plates or strips. The nozzle strips preferably comprise a longitudinal water channel and two longitudinal air channels, branch channels branching from the water channel to the flat jet nozzles and the air channels ending in air gaps directed towards the nozzle outlet openings.

Die Düsenleisten können in seperat mit Wasser speisbare Module unterteilt oder aus solchen Modulen aufgebaut sein.The nozzle strips can be separated into water-feedable modules be divided or built up from such modules.

Bei einer bevorzugten Ausgestaltung der erfindungsgemässen Vorrichtung weisen die Düsenleisten oder Module einen vorzugsweise stranggepressten Grundkörper auf, in welchen die Flachstrahldüsen auswechselbar eingesetzt sind. Hierbei sind dem Grundkörper bevorzugt Luftkammer bildende Abdeckungen mit einem auf die Düsenaustrittsöffnungen gerichteten Luftspalt aufgesetzt und die Luftkammern über Verbindungskanäle mit den Luftkanälen verbunden.In a preferred embodiment of the device according to the invention, the nozzle strips or modules have a preferably extruded base body, in which the flat jet nozzles are interchangeably inserted. In this case, covers, which form an air chamber, are preferably placed on the base body with an air gap directed at the nozzle outlet openings, and the air chambers are connected to the air channels via connecting channels.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnung; diese zeigt schematisch in

- Fig. 1a
eine Uebersichtsdarstellung eines Warmwalzwerks mit anschliessender Kühlstation;
- Fig. 1b
einen Teil einer Fertigstrasse mit einer Kühlstation;
- Fig. 2
einen Querschnitt durch die Kühlstation von Fig. 1a;
- Fig. 3
eine Schrägsicht auf ein Modul einer Düsenleiste von Fig. 2;
- Fig. 4
eine Ansicht eines Moduls entgegen der Strahlrichtung;
- Fig. 5
einen Schnitt durch Fig. 4 entlang deren Linie I-I;
- Fig. 6
den zeitlichen Verlauf des Luftdrucks in einem ersten Luftkanal;
- Fig. 7
den zeitlichen Verlauf des Luftdrucks in einem zweiten Luftkanal.
Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawing; this shows schematically in
- Fig. 1a
a general view of a hot rolling mill with subsequent cooling station;
- Fig. 1b
part of a finishing train with a cooling station;
- Fig. 2
a cross section through the cooling station of Fig. 1a;
- Fig. 3
an oblique view of a module of a nozzle bar of Fig. 2;
- Fig. 4
a view of a module against the beam direction;
- Fig. 5
a section through Figure 4 along the line II.
- Fig. 6
the time course of the air pressure in a first air duct;
- Fig. 7
the time course of the air pressure in a second air duct.

Aus einem Warmwalzwerk 10 tritt gemäss Fig. la ein Warmwalzband 12 aus, welches mittels einer Schere oder Säge 14 zu Platten 16 abgelängt und über einen Rollgang 18 in Transportrichtung x durch eine Kühlstation 20 bewegt wird. Die in der Kühlstation 20 abgekühlten Platten 16 werden bis zur Weiterverarbeitung als Stapel 22 zwischengelagert.According to FIG. 1 a, a hot rolling strip 12 emerges from a hot rolling mill 10, which is cut into plates 16 by means of scissors or saw 14 and is moved via a roller table 18 in the transport direction x through a cooling station 20. The in the Cooling station 20 cooled plates 16 are temporarily stored as a stack 22 until further processing.

In Fig. 1b durchläuft ein abgelängtes Warmwalzband 12a die Kühlstation 20, welche hier vor dem Tandemwalzgerüst 21 einer Fertigstrasse angeordnet ist. Anstelle des Tandemwalzgerüstes 21 könnte auch ein Reversiergerüst stehen.In Fig. 1b a cut hot rolling strip 12a passes through the cooling station 20, which is arranged here in front of the tandem mill stand 21 of a finishing train. Instead of the tandem roll stand 21, a reversing stand could also be used.

Innerhalb der Kühlstation 20 sind gemäss Fig. 2 untere und obere Düsenleisten 24 in Platten- oder Bandtransportrichtung x angeordnet. In den Fig. 3 und 4 sind Module 26 mit drei Flachstrahldüsen 52 dargestellt. Die von den Flachstrahldüsen 52 sichtbaren Düsenaustrittsöffnungen 53, die einen Abstand von beispielsweise 150 mm zur Oberfläche 32 der Platte 16 oder des Bandes 12a aufweisen, sind in regelmässigen Abständen von beispielsweise 100 bis 200 mm angeordnet. Den Düsenaustrittsöffnungen 52 benachbart sind beidseits Abdeckungen 34, 36 für Luftkammern 38, 40 sichtbar. Wahlweise sind zusätzliche Wasserdüsen 60 vorgesehen. Diese Wasserdüsen 60 werden dann zugeschaltet, wenn bei dickeren Platten 16 oder Bändern 12a bei der vorgegebenen Transportgeschwindigkeit die Kühlwirkung der Flachstrahldüsen 52 ungenügend ist.According to FIG. 2, lower and upper nozzle strips 24 are arranged inside the cooling station 20 in the plate or tape transport direction x. 3 and 4, modules 26 with three flat jet nozzles 52 are shown. The nozzle outlet openings 53 visible from the flat jet nozzles 52, which are at a distance of, for example, 150 mm from the surface 32 of the plate 16 or the band 12a, are arranged at regular intervals of, for example, 100 to 200 mm. Covers 34, 36 for air chambers 38, 40 are visible on both sides adjacent to the nozzle outlet openings 52. Additional water nozzles 60 are optionally provided. These water nozzles 60 are then switched on when the cooling effect of the flat jet nozzles 52 is inadequate in the case of thicker plates 16 or belts 12a at the predetermined transport speed.

Mit ihren Stirnseiten 27 direkt aneinanderliegend oder in kurzem Abstand zueinander aufgereiht bilden die Module 26 die unteren und oberen Düsenleisten 24. Jedes Modul 26 ist seperat mit Wasser und Luft speisbar. Wie insbesondere aus Fig. 5 hervorgeht, weist das Modul 26 einen vorzugsweise stranggepressten Grundkörper 42 mit einem längslaufenden zentralen Wasserkanal 46 sowie beidseitig des Wasserkanals 46 angeordnete längslaufende Luftkanäle 48, 50 auf.With their end faces 27 directly adjacent to one another or lined up at a short distance from one another, the modules 26 form the lower and upper nozzle strips 24. Each module 26 can be fed separately with water and air. As can be seen in particular from FIG. 5, the module 26 has a preferably extruded base body 42 with a longitudinal central water channel 46 and longitudinal air channels 48, 50 arranged on both sides of the water channel 46.

Die Luftkanäle 48, 50 sind über Verbindungskanäle 62, 64 mit Luftkammern 38, 40 verbunden. Diese Luftkammern 38, 40 werden durch am Grundkörper 42 angeschraubte Abdeckungen 34, 36 gebildet. Zwischen der Abdeckung 34, 36 und der um etwa 45° geneigten Fläche des Grundkörpers 42 ist ein auf die Düsenaustrittsöffnung 53 gerichteter Luftspalt 54, 56 angeordnet.The air channels 48, 50 are connected to air chambers 38, 40 via connecting channels 62, 64. These air chambers 38, 40 are formed by covers 34, 36 screwed to the base body 42. Between the cover 34, 36 and the by about 45 ° An inclined surface of the base body 42 is an air gap 54, 56 directed toward the nozzle outlet opening 53.

Der Wasserkanal 46 ist über Stichkanäle 58 mit den Flachstrahldüsen 52 verbunden. Die Speisung der zusätzlichen Wasserdüsen 60 erfolgt im Bedarfsfall über einen weiteren, in der Zeichnung nicht dargestellten Wasserkanal.The water channel 46 is connected to the flat jet nozzles 52 via branch channels 58. If required, the additional water nozzles 60 are supplied via a further water channel, not shown in the drawing.

Nachfolgend wird die Betriebsweise eines Moduls 26 anhand der Fig. 5 bis 7 näher erläutert.The mode of operation of a module 26 is explained in more detail below with reference to FIGS. 5 to 7.

Aus den Flachstrahldüsen 52 tritt ein im wesentlichen ebener Wasserstrahl W aus. Dieser Wasserstrahl W wird nun wechselweise mit Luftstrahlen A, B, die aus den Luftspalten 54 bzw. 56 austreten, in seiner Richtung abgelenkt, sodass sich insgesamt ein Schwenkwinkel α ergibt.An essentially flat water jet W emerges from the flat jet nozzles 52. This water jet W is now alternately deflected in its direction with air jets A, B, which emerge from the air gaps 54 and 56, so that a swivel angle α results overall.

Die Luftdruckverhältnisse für die beiden Luftstrahlen A, B in Abhängigkeit von der Zeit t sind in den Fig. 6 und 7 dargestellt. Die Einstellung des Luftdrucks p erfolgt jeweils im entsprechenden Luftkanal 48 bzw. 50. Der Wasserstrahl W wird zunächst aus seiner Normalstellung durch den ersten Luftstrahl A maximal ausgelenkt und wieder in die Normallage zurückgeführt. Nun folgt die Auslenkung des Wasserstrahls W durch den zweiten Luftstrahl B in die andere Richtung bis zur maximalen Auslenkung und hernach wieder zurück in die Normalstellung. Diese wechselseitige periodische Auslenkung mit einer Periodendauer T erfolgt beispielsweise mit einer Frequenz von etwa 1 Hz.The air pressure ratios for the two air jets A, B as a function of time t are shown in FIGS. 6 and 7. The air pressure p is set in each case in the corresponding air duct 48 or 50. The water jet W is first deflected from its normal position by the first air jet A to the maximum and returned to the normal position. Now the water jet W is deflected by the second air jet B in the other direction to the maximum deflection and then back to the normal position. This mutual periodic deflection with a period T takes place, for example, at a frequency of approximately 1 Hz.

Die Luftstrahlen A und B zur Ablenkung des Wasserstrahls W können grundsätzlich durch Wasserstrahlen ersetzt werden, wobei in diesem Fall die sich aus dem Wasserstrahl W und den ablenkenden Wasserstrahlen zusammensetzende Gesamtwassermenge bevorzugt konstant gehalten wird.The air jets A and B for deflecting the water jet W can in principle be replaced by water jets, in which case the total amount of water composed of the water jet W and the deflecting water jets is preferably kept constant.

Wie insbesondere aus Fig. 3 hervorgeht, verläuft die Wischbewegung des aus den Flachstrahldüsen 52 austretenden Wasserstrahls W quer zur Transportrichtung x der Platten 16 oder des Bandes 12a, wobei aufeinanderfolgende Düsen jeweils gegenläufige Wischbewegungen ausführen.As can be seen in particular from FIG. 3, the wiping movement of the water jet W emerging from the flat jet nozzles 52 runs transversely to the transport direction x of the plates 16 or the belt 12a, successive nozzles each carrying out opposite wiping movements.

Die Länge 1 der Auftreffläche 30 des Wasserstrahls W auf der Oberfläche 32 der Platten 16 oder des Bandes 12a beträgt beispielsweise 200 mm, die Breite b beispielsweise 5 mm. Die Flachstrahldüsen 52 sind in den Düsenleisten 24 bzw. Modulen 26 derart angeordnet, dass sich die Auftrefflächen 30 benachbarter Wasserstrahlen W bei der Wischbewegung etwa berühren.The length 1 of the impact surface 30 of the water jet W on the surface 32 of the plates 16 or the band 12a is, for example, 200 mm, the width b, for example, 5 mm. The flat jet nozzles 52 are arranged in the nozzle strips 24 or modules 26 in such a way that the impingement surfaces 30 of adjacent water jets W approximately touch during the wiping movement.

Claims (10)

Verfahren zum Kühlen von warmgewalzten Platten (16) und Bändern (12a) aus Metall, insbesondere aus Aluminium oder einer Aluminiumlegierung, wobei ein warmgewalztes Band (12) unmittelbar nach seinem Austritt aus einem Warmwalzwerk (10) zu Platten (16) oder Bändern (12a) abgelängt wird,
dadurch gekennzeichnet,
dass die Platten (16) oder Bänder (12a) unmittelbar nach dem Ablängen kontinuierlich eine Kühlstation (20) durchlaufen und in dieser über Flachstrahldüsen (52) direkt mit Wasser beaufschlagt werden, wobei der aus den Flachstrahldüsen (52) austretende Wasserstrahl (W) im wesentlichen eineauf die Platten- oder Bandoberfläche (32) gerichtete Ebene (E) bildet und der Wasserstrahl (W) unmittelbar nach seinem Austritt aus der Flachstrahldüse (52) mittels Luft- oder Wasserstrahlen (A,B) periodisch deart abgelenkt wird, dass der auf die Platten-oder Bandoberfläche (32) auftreffende Wasserstrahl (W) eine Wischbewegung ausführt.Method for cooling hot-rolled plates (16) and strips (12a) made of metal, in particular aluminum or an aluminum alloy, wherein a hot-rolled strip (12) immediately after it leaves a hot rolling mill (10) to form plates (16) or strips (12a ) is cut to length,
characterized,
that the plates (16) or strips (12a) immediately after cutting to length pass through a cooling station (20) and water is directly applied to them via flat jet nozzles (52), the water jet (W) emerging from the flat jet nozzles (52) in essentially forms a plane (E) directed towards the plate or belt surface (32) and the water jet (W) is periodically deflected by air or water jets (A, B) immediately after it emerges from the flat jet nozzle (52) such that it the water jet (W) striking the plate or belt surface (32) performs a wiping movement. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass zur Ausführung der Wischbewegung der aus der Flachstrahldüse (52) austretende Wasserstrahl (W) um einen Winkel (α) in einem Bereich zwischen 30 und 120° geschwenkt wird.A method according to claim 1, characterized in that for executing the wiping movement the water jet (W) emerging from the flat jet nozzle (52) is pivoted through an angle (α) in a range between 30 and 120 °. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Abstand (a) von der Austrittsöffnung (53) der Flachstrahldüse (52) zur Platten- oder Bandoberfläche (32) 100 bis 200 mm beträgt.Method according to claim 1 or 2, characterized in that the distance (a) from the outlet opening (53) of the flat jet nozzle (52) to the plate or strip surface (32) is 100 to 200 mm. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Auftreffläche (30) des Wasserstrahls W) auf der Platten- oder Bandoberfläche (32) eine Breite (b) von etwa 5 bis 10 mm und ein Verhältnis Länge (1) : Breite (b) von 5 : 1 bis 100 : 1 aufweist.Method according to one of claims 1 to 3, characterized in that that the impact surface (30) of the water jet W) on the plate or belt surface (32) has a width (b) of approximately 5 to 10 mm and a length (1): width (b) ratio of 5: 1 to 100: 1 having. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Wischbewegung mit einer Frequenz von 0,1 bis 20 Hz, vorzugsweise 0,5 bis 2 Hz, ausgeführt wird.Method according to one of claims 1 to 4, characterized in that the wiping movement is carried out at a frequency of 0.1 to 20 Hz, preferably 0.5 to 2 Hz. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 5 mit Flachstrahldüsen (52), dadurch gekennzeichnet, dass die Flachstrahldüsen (52) auf in Laufrichtung (x) der Platten (16) oder Bänder (12a) verlaufenden Düsenleisten (24) angeordnet sind.Device for carrying out the method according to one of claims 1 to 5 with flat jet nozzles (52), characterized in that the flat jet nozzles (52) are arranged on nozzle strips (24) running in the running direction (x) of the plates (16) or belts (12a) . Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Düsenleisten (24) einen längslaufenden Wasserkanal (46) und zwei längslaufende Luftkanäle (48, 50) umfassen, wobei vom Wasserkanal (46) Stichkanäle (58) zu den Flachstrahldüsen (52) abzweigen und die Luftkanäle (48,50) in auf die Düsenaustrittsöffnungen (53) gerichteten Luftspalten (54,56) enden.Apparatus according to claim 6, characterized in that the nozzle strips (24) comprise a longitudinal water channel (46) and two longitudinal air channels (48, 50), branch channels (58) branching from the water channel (46) to the flat jet nozzles (52) and the Air channels (48, 50) end in air gaps (54, 56) directed towards the nozzle outlet openings (53). Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die Düsenleisten (24) in seperat mit Wasser speisbare Module (26) unterteilt oder aus solchen Modulen (26) aufgebaut sind.Device according to Claim 7, characterized in that the nozzle strips (24) are subdivided into modules (26) which can be fed separately with water or are constructed from such modules (26). Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass die Düsenleisten (24) oder Module (26) einen vorzugsweise stranggepressten Grundkörper (42) aufweisen, in welchen die Flachstrahldüsen (52) auswechselbar eingesetzt sind.Device according to claim 7 or 8, characterized in that the nozzle strips (24) or modules (26) have a preferably extruded base body (42) in which the flat jet nozzles (52) are interchangeably inserted. Vorrichtung nach einem der Ansprüch 7 bis 9, dadurch gekennzeichnet, dass dem Grundkörper (42) Luftkammern (38,40) bildende Abdeckungen (34,36) mit einem auf die Düsenaustrittsöffnungen (53) gerichteten Luftspalt (54,56) aufgesetzt sind und die Luftkammern (38,40) über Verbindungskanäle (62,64) mit den Luftkanälen (48, 50) verbunden sind.Device according to one of claims 7 to 9, characterized in that the base body (42) air chambers (38,40) forming covers (34,36) with an air gap (54,56) directed towards the nozzle outlet openings (53) and the air chambers (38,40) via connecting channels (62,64) with the air channels (48, 50) are connected.
EP95810449A 1994-07-20 1995-07-07 Device for cooling hot-rolled metal plates and strips Expired - Lifetime EP0695590B1 (en)

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CH229794 1994-07-20
CH2297/94 1994-07-20

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EP (1) EP0695590B1 (en)
AT (1) ATE177031T1 (en)
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DE (1) DE59505170D1 (en)
HU (1) HUT72285A (en)
NO (1) NO311203B1 (en)

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EP0839918A1 (en) 1996-11-01 1998-05-06 Alusuisse Technology & Management AG Method and apparatus for cooling an object
DE10207584A1 (en) * 2002-02-22 2003-09-11 Vits Maschb Gmbh I Ins Process for cooling metal strips or plates and cooling device
EP1624078A1 (en) 2004-08-04 2006-02-08 Ebner Industrieofenbau Gesellschaft m.b.H. Apparatus for cooling sheet metal strip
ITMI20111092A1 (en) * 2011-06-17 2012-12-18 Eagle Tech S R L REFINED HOOD FOR THE CONTROLLED COOLING OF EXTRUDED ALUMINUM PROFILES OR OTHER METALS OUTPUT FROM THE EXTRUSION LINE.
WO2017017150A1 (en) * 2015-07-28 2017-02-02 Hydro Aluminium Rolled Products Gmbh Method and device for changing the temperature of metal strips in a flatness-adaptive manner
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
WO2023148771A1 (en) 2022-02-03 2023-08-10 Hindalco Industries Limited Apparatus for cooling of hot rolled sheet coils

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CN101293229B (en) * 2008-01-16 2010-06-02 东北大学 Dual-purpose refrigerating device for spraying gas and mist
FR3060021B1 (en) * 2016-12-14 2018-11-16 Fives Stein METHOD AND RAPID COOLING SECTION OF A CONTINUOUS LINE OF TREATMENT OF METAL STRIP
DE102017107549A1 (en) * 2017-04-07 2018-10-11 Schwartz Gmbh Temperature control station for the partial heat treatment of a metallic component
DE102018109579A1 (en) * 2018-04-20 2019-10-24 Schwartz Gmbh Temperature control device for partial cooling of a component
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US5902543A (en) * 1996-11-01 1999-05-11 Alusuisse Technology & Management Ltd. Process and device for cooling an article
DE10207584A1 (en) * 2002-02-22 2003-09-11 Vits Maschb Gmbh I Ins Process for cooling metal strips or plates and cooling device
EP1624078A1 (en) 2004-08-04 2006-02-08 Ebner Industrieofenbau Gesellschaft m.b.H. Apparatus for cooling sheet metal strip
US7582251B2 (en) 2004-08-04 2009-09-01 Ebner Industrieofenbau Gesellschaft M.B.H. Apparatus for cooling a strip of sheet metal
ITMI20111092A1 (en) * 2011-06-17 2012-12-18 Eagle Tech S R L REFINED HOOD FOR THE CONTROLLED COOLING OF EXTRUDED ALUMINUM PROFILES OR OTHER METALS OUTPUT FROM THE EXTRUSION LINE.
EP2535431A1 (en) * 2011-06-17 2012-12-19 Eagle Tech S.r.l. Improved hood assembly for controllably cooling extruded section members of aluminium and other metal materials at an output of an extruding line therefor.
WO2017017150A1 (en) * 2015-07-28 2017-02-02 Hydro Aluminium Rolled Products Gmbh Method and device for changing the temperature of metal strips in a flatness-adaptive manner
US10676807B2 (en) 2015-07-28 2020-06-09 Hydro Aluminium Rolled Products Gmbh Method and device for changing the temperature of metal strips in a flatness-adaptive manner
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
WO2023148771A1 (en) 2022-02-03 2023-08-10 Hindalco Industries Limited Apparatus for cooling of hot rolled sheet coils

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ATE177031T1 (en) 1999-03-15
HUT72285A (en) 1996-04-29
NO952845D0 (en) 1995-07-18
EP0695590B1 (en) 1999-03-03
DE59505170D1 (en) 1999-04-08
CA2154044A1 (en) 1996-01-21
NO952845L (en) 1996-01-22
HU9502139D0 (en) 1995-09-28
NO311203B1 (en) 2001-10-29
US5640872A (en) 1997-06-24

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