EP3713687A1 - Method for cooling a metallic item and cooling bar - Google Patents

Method for cooling a metallic item and cooling bar

Info

Publication number
EP3713687A1
EP3713687A1 EP18804566.0A EP18804566A EP3713687A1 EP 3713687 A1 EP3713687 A1 EP 3713687A1 EP 18804566 A EP18804566 A EP 18804566A EP 3713687 A1 EP3713687 A1 EP 3713687A1
Authority
EP
European Patent Office
Prior art keywords
cooling
slot
sections
bar
width
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
EP18804566.0A
Other languages
German (de)
French (fr)
Other versions
EP3713687B1 (en
Inventor
Frederik Grosse Lordemann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Group GmbH
Original Assignee
SMS Group GmbH
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Filing date
Publication date
Application filed by SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP3713687A1 publication Critical patent/EP3713687A1/en
Application granted granted Critical
Publication of EP3713687B1 publication Critical patent/EP3713687B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
    • 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
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor

Definitions

  • the invention relates to a method for cooling a metallic material by applying a cooling medium from a chilled beam to the material, wherein the cooling medium is discharged through a slot of the cooling beam. Furthermore, the invention relates to a cooling bar for applying a cooling medium to a good to be cooled.
  • a generic chilled beam and a method for cooling a metallic material by such is known, for example from CN 101020196 A.
  • a pressurized cooling medium (usually water) is passed through the cooling bar and exits through a slot (nozzle slot) from the chilled beam to get to the good to be cooled.
  • the desired slot width is set by a ruler-shaped component, which can be screwed to the chilled beam. However, this is then fixed during the ongoing process.
  • the nozzle geometry can indeed be adjusted, but this setting can not be changed during operation. Thus, it is not possible to react to changing process parameters. It is therefore disadvantageous that in the previously known solutions there is no possibility of varying the cooling capacity beyond the previously known extent during the process. This is especially true with regard to adjustment of the volume flow of the cooling medium in the direction transverse to the conveying direction of the metallic Guts (or the cooling bar, if this is moved relative to the material to be cooled).
  • the invention is therefore an object of the invention to provide a method of the type mentioned above and a chilled beam with which it is possible to allow optimal adjustment of the cooling capacity to desired or required boundary conditions, said adjustment should be possible quickly and during the process , The cooling should be improved so far.
  • the solution of this object by the invention according to the method is characterized in that during the cooling process, the width of the slot in the conveying direction of the Guts or the cooling bar (if this is moved relative to the Good) is changed to the cooling capacity of the cooling medium to a desired or to control or regulate the given level.
  • the slot is delimited by at least two sections of the cooling beam, wherein the at least two sections are moved relative to one another in a feed direction.
  • the width of the slot in the direction transverse to the conveying direction and perpendicular to the outlet direction of the cooling medium can also be varied differently according to a development of the invention in sections.
  • the two sections of the cooling bar can, as seen perpendicular to the outlet direction of the cooling medium, have a non-linear course.
  • the two sections of the cooling beam viewed perpendicular to the outlet direction of the cooling medium, each have a concave and a subsequent convex part.
  • the width of the slot can be adjusted so that the width in a central region of the material to be cooled is greater than in the lateral end regions of the material to be cooled.
  • the proposed chilled beam for applying a cooling medium to a good to be cooled is inventively characterized in that electrical, pneumatic or hydraulic adjusting means are provided with which the width of the slot in the conveying direction (of the goods or the cooling beam) can be changed.
  • the adjusting means may be in communication with a controller, wherein at least one sensor in communication with the sensor is arranged, with which a physical property of the Guts can be determined.
  • the slot is preferably delimited by at least two sections of the cooling bar, wherein the at least two sections of the cooling bar, viewed perpendicular to the outlet direction of the cooling medium, have a non-linear course, preferably an S-shaped course.
  • the proposed concept or the proposed cooling beam is suitable for heavy plate rolling mills, in hot strip mills and in heat treatment lines, especially for steel materials. Equally, however, an application for non-ferrous metals is possible. In particular, an application in Quetten with slot jet cooling bars for cooling water is possible. There is thus provided a chilled beam with a slot nozzle and a variable width nozzle geometry. This makes it possible to use Defined specifications to influence the nozzle geometry targeted, during the cooling process itself.
  • the present invention thus provides cooling bars with slot nozzles, wherein the nozzle geometry and thus the volume flow over the width of the material to be cooled during operation can be changed.
  • a control system can be realized, which makes specifications for a proposed actuator.
  • the slot nozzle of the proposed cooling beam consists of at least two parts, wherein at least a part of the nozzle is designed to be movable.
  • the change in the slot geometry can be done for example via a delivery of a nozzle part in the direction of the other. This delivery can be uneven over the nozzle width. For example, less cooling water can be applied to the edges. This helps to eliminate the above-mentioned disadvantage.
  • Another possibility is to provide the nozzle parts with a special contour, in particular with an S-shaped geometry, and then to change the nozzle gap against each other via an axial displacement of the parts.
  • the adjustment of the slot can be done manually or automatically.
  • An actuator system is provided for automatic slot adjustment and the possible variable application of water across the plate width.
  • This actuator system preferably receives the adjustment values from an automation system (control system).
  • the automation system receives information about the sheet metal dimensions and material quality (primary data), target properties (hardness, strength, etc.) data from process sensors (material temperatures, actual flatness, etc.) before, in and behind the cooling device and achieved actual properties after the Process. With this information, the system is able to send adjustment values to the actuators. Through this continuous reflux of the actual properties, it is possible to choose the values such that a homogeneous distribution of the sheet properties especially over the width. But it is also possible to set specifically different properties over the sheet width.
  • the nozzle gap of the slot nozzle can be opened, whereby impurities can be flushed out of the slot, for example in the form of lumps or platelets.
  • the proposed solution makes it possible to variably adjust or adjust the geometry of a slot nozzle. This adjustment can take place during operation also during the cooling of a good (sheet metal). This makes it possible to give the sheet metal head or sheet metal foot a different water supply.
  • a control can be provided which predetermines desired values for the control of the nozzle geometry as a function of various process and default values. Through these measures, a better flatness and optimized material properties can be achieved in the cooling process.
  • the proposed solution makes it possible to specifically control the cooling medium flowing on the side in such a way that a desired cooling takes place across the width of a band.
  • a uniform cooling over the bandwidth can be achieved.
  • FIG. 1 shows schematically the side view of a cooling bar, shown in section, which cools a metallic material passing in the conveying direction
  • 2a shows the slot of the cooling beam, seen in the discharge direction of the cooling medium, in a first relative position of two sections of the cooling beam and
  • FIG. 2b shows the slot of the cooling beam according to FIG. 2a in a second, displaced relative position of the sections of the cooling beam.
  • FIG. 1 shows a cooling bar 2 under which a metallic material 1 in the form of a metal strip runs in a conveying direction F and is cooled by cooling medium which is discharged from the cooling bar 2.
  • the horizontal direction Q transverse to the conveying direction F is perpendicular to the plane of the drawing in FIG.
  • the cooling beam 2 has a slot 3, which extends over the entire width of the metallic Guts 2, ie in the direction Q and thereby - measured in the conveying direction F - has a width B.
  • the outlet direction A of the cooling medium is arranged at a certain angle to the surface of the product 1, which, however, does not change the fact that the width B extends over a certain amount in the conveying direction F.
  • two sections 4 and 5 of the cooling bar 2 can be moved or displaced relative to each other, ie. H. one of the sections, in the embodiment section 5, is moved in a feed direction Z to adjust the width B of the slot 3.
  • a physical variable (it can be the flatness of the product 1 or its temperature) can be determined by means of a sensor 10 detected and the measured value of a controller 9 is supplied. On the basis of an algorithm stored in it, this can then give a control signal to the adjusting means 8, with which a specific width B is set, so that a desired property of the product 1 can be achieved. It can thus be ensured in a closed loop that the width B of the slot 3 of the cooling bar is set so that there is a desired property of the product 1.
  • FIGS. 2a and 2b A specific and preferred embodiment of the sections 4 and 5 of the cooling bar 2 is shown in FIGS. 2a and 2b.
  • FIG. 2 a While in FIG. 2 a the two sections 4 and 5 are in a starting position and the slot 3 has a largely constant (although curved) width B, in FIG. 2 b the two sections 4 and 5 are displaced in the direction Q relative to one another (FIG. the upper portion 4 has been moved to the right in Figure 2 and the lower portion 5 to the left). Accordingly, the shape of the slot 3 has changed.
  • the amount and distribution of the exiting cooling medium can be influenced and thus the cooling process can be controlled or regulated. This is in particular active during the cooling process, so that it is possible to influence changing circumstances with regard to the process by influencing the cooling.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Nozzles (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The invention relates to a method for cooling a metallic item (1) by discharging a cooling medium from a cooling bar (2) onto the item (1), wherein the cooling medium is discharged through a slot (3) in the cooling bar (2). According to the invention, in order to achieve improved cooling, during the cooling process the width (B) of the slot (3) in the conveying direction (F) of the item (1) or the cooling bar (2) is altered in order to bring the cooling power of the cooling medium to a desired or predefined level by open-loop or closed-loop control. In addition, the invention relates to a cooling bar.

Description

Verfahren zum Kühlen eines metallischen Guts und Kühlbalken  Method for cooling a metallic material and cooling beam
Die Erfindung betrifft ein Verfahren zum Kühlen eines metallischen Guts durch Ausbringung eines Kühlmediums aus einem Kühlbalken auf das Gut, wobei das Kühlmedium durch einen Schlitz des Kühlbalkens ausgebracht wird. Des weiteren betrifft die Erfindung einen Kühlbalken zur Ausbringung eines Kühlmediums auf ein zu kühlendes Gut. Ein gattungsgemäßer Kühlbalken sowie ein Verfahren zum Kühlen eines metallischen Guts durch einen solchen ist beispielsweise aus der CN 101020196 A bekannt. Ein unter Druck stehendes Kühlmedium (üblicherweise Wasser) wird dabei durch den Kühlbalken geleitet und tritt durch einen Schlitz (Düsenschlitz) aus dem Kühlbalken aus, um auf das zu kühlende Gut zu gelangen. Dabei wird durch ein linealförmiges Bauteil, welches am Kühlbalken festgeschraubt werden kann, die gewünschte Schlitzbreite eingestellt. Diese liegt dann allerdings während des laufenden Prozesses fest. Variationen in der Kühlleistung sind dann nur noch durch Änderung des Drucks des Kühlmediums möglich. Eine ähnliche Lösung zeigt die EP 1 420 912 B1. Beim Kühlen von Blech wird in der Regel Wasser auf die Blechoberfläche beaufschlagt. Bei einem langen Blech kann das Kühlwasser lediglich über die Blechkanten ablaufen. Das führt dazu, dass bei einer gleichmäßigen Beaufschlagung über die Blechbreite der Volumenstrom des Kühlwassers auf der Blechoberfläche zu den Blechrändern zunimmt. Dies führt zu einer ungleichmäßigen Kühlwirkung bzw. Abkühlung. Des weiteren kann es zu einer prozessbedingten Inhomogenität im Temperaturprofil kommen. Beides führt zu ungleichmäßigen mechanischen Eigenschaften und zur Unebenheit des Blechs. The invention relates to a method for cooling a metallic material by applying a cooling medium from a chilled beam to the material, wherein the cooling medium is discharged through a slot of the cooling beam. Furthermore, the invention relates to a cooling bar for applying a cooling medium to a good to be cooled. A generic chilled beam and a method for cooling a metallic material by such is known, for example from CN 101020196 A. A pressurized cooling medium (usually water) is passed through the cooling bar and exits through a slot (nozzle slot) from the chilled beam to get to the good to be cooled. In this case, the desired slot width is set by a ruler-shaped component, which can be screwed to the chilled beam. However, this is then fixed during the ongoing process. Variations in the cooling capacity are then only possible by changing the pressure of the cooling medium. A similar solution is shown in EP 1 420 912 B1. When cooling sheet metal water is usually applied to the sheet surface. With a long plate, the cooling water can only drain over the plate edges. This leads to the volume flow of the cooling water on the sheet surface increasing towards the sheet metal edges when the sheet width is uniformly applied. This leads to an uneven cooling effect or cooling. Furthermore, there may be a process-related inhomogeneity in the temperature profile. Both result in uneven mechanical properties and unevenness of the sheet.
Bei den vorbekannten Lösungen lässt sich die Düsengeometrie zwar verstellen, diese Einstellung kann aber nicht im laufenden Betrieb geändert werden. Somit kann nicht auf sich ändernde Prozessparameter reagiert werden. Nachteilig ist es also, dass bei den vorbekannten Lösungen keine Möglichkeit besteht, während des Prozesses die Kühlleistung über das vorbekannte Maß hinaus zu variieren. Dies gilt insbesondere auch mit Blick auf Einstellung des Volumenstroms des Kühlmediums in Richtung quer zur Förderrichtung des metallischen Guts (bzw. des Kühlbalkens, falls dieser relativ zum zu kühlenden Gut bewegt wird). In the previously known solutions, the nozzle geometry can indeed be adjusted, but this setting can not be changed during operation. Thus, it is not possible to react to changing process parameters. It is therefore disadvantageous that in the previously known solutions there is no possibility of varying the cooling capacity beyond the previously known extent during the process. This is especially true with regard to adjustment of the volume flow of the cooling medium in the direction transverse to the conveying direction of the metallic Guts (or the cooling bar, if this is moved relative to the material to be cooled).
Der Erfindung liegt daher die A u f g a b e zugrunde, ein Verfahren der eingangs genannten Art sowie einen Kühlbalken bereitzustellen mit dem es möglich wird, eine optimale Einstellung der Kühlleistung an gewünschte bzw. geforderte Randbedingungen zu erlauben, wobei besagte Einstellung schnell und während des Prozesses möglich sein soll. Die Kühlung soll insoweit verbessert werden. The invention is therefore an object of the invention to provide a method of the type mentioned above and a chilled beam with which it is possible to allow optimal adjustment of the cooling capacity to desired or required boundary conditions, said adjustment should be possible quickly and during the process , The cooling should be improved so far.
Die L ö s u n g dieser Aufgabe durch die Erfindung ist verfahrensgemäß dadurch gekennzeichnet, dass während des Kühlvorgangs die Breite des Schlitzes in Förderrichtung des Guts oder des Kühlbalkens (falls dieser relativ zum Gut bewegt wird) verändert wird, um die Kühlleistung des Kühlmediums auf ein gewünschtes oder vorgegebenes Niveau zu steuern oder zu regeln. The solution of this object by the invention according to the method is characterized in that during the cooling process, the width of the slot in the conveying direction of the Guts or the cooling bar (if this is moved relative to the Good) is changed to the cooling capacity of the cooling medium to a desired or to control or regulate the given level.
Dabei wird insbesondere vorgesehen, dass der Schlitz durch mindestens zwei Abschnitte des Kühlbalkens begrenzt wird, wobei die mindestens zwei Abschnitte relativ zueinander in eine Zustellrichtung bewegt werden. It is provided in particular that the slot is delimited by at least two sections of the cooling beam, wherein the at least two sections are moved relative to one another in a feed direction.
Die Breite des Schlitzes in Richtung quer zur Förderrichtung und senkrecht zur Austrittsrichtung des Kühlmediums kann dabei gemäß einer Fortbildung der Erfindung auch abschnittsweise unterschiedlich verändert werden. The width of the slot in the direction transverse to the conveying direction and perpendicular to the outlet direction of the cooling medium can also be varied differently according to a development of the invention in sections.
Die beiden Abschnitte des Kühlbalkens können dabei, gesehen senkrecht zur Austrittsrichtung des Kühlmediums, einen nichtlinearen Verlauf aufweisen. Hierbei ist insbesondere vorgesehen, dass die beiden Abschnitte des Kühlbalkens, gesehen senkrecht zur Austrittsrichtung des Kühlmediums, jeweils einen konkaven und einen sich hieran anschließenden konvexen Teil aufweisen. In diesem Falle ist bevorzugt vorgesehen, dass zwecks Einstellung des Düsenspalts die mindestens zwei Abschnitte des Kühlbalkens zur Veränderung der Breite des Schlitzes in eine Richtung senkrecht zur Austrittsrichtung des Kühlmediums und senkrecht zur Förderrichtung verschoben werden (also in Richtung quer zur Förderrichtung). Die Breite des Schlitzes kann dabei so eingestellt werden, dass die Breite in einem Mittenbereich des zu kühlenden Guts größer ist als in den seitlichen Endbereichen des zu kühlenden Guts. The two sections of the cooling bar can, as seen perpendicular to the outlet direction of the cooling medium, have a non-linear course. In this case, it is provided in particular that the two sections of the cooling beam, viewed perpendicular to the outlet direction of the cooling medium, each have a concave and a subsequent convex part. In this case, it is preferably provided that for the purpose of adjusting the nozzle gap, the at least two Sections of the cooling bar for changing the width of the slot in a direction perpendicular to the outlet direction of the cooling medium and are moved perpendicular to the conveying direction (ie in the direction transverse to the conveying direction). The width of the slot can be adjusted so that the width in a central region of the material to be cooled is greater than in the lateral end regions of the material to be cooled.
Der vorgeschlagene Kühlbalken zur Ausbringung eines Kühlmediums auf ein zu kühlendes Gut zeichnet sich erfindungsgemäß dadurch aus, dass elektrische, pneumatische oder hydraulische Verstellmittel vorhanden sind, mit denen die Breite des Schlitzes in Förderrichtung (des Guts oder des Kühlbalkens) verändert werden kann. Die Verstellmittel können dabei mit einer Steuerung in Verbindung stehen, wobei mindestens ein mit der Steuerung in Verbindung stehender Sensor angeordnet ist, mit dem eine physikalische Eigenschaft des Guts ermittelt werden kann. The proposed chilled beam for applying a cooling medium to a good to be cooled is inventively characterized in that electrical, pneumatic or hydraulic adjusting means are provided with which the width of the slot in the conveying direction (of the goods or the cooling beam) can be changed. The adjusting means may be in communication with a controller, wherein at least one sensor in communication with the sensor is arranged, with which a physical property of the Guts can be determined.
Der Schlitz wird bevorzugt durch mindestens zwei Abschnitte des Kühlbalkens begrenzt, wobei die mindestens zwei Abschnitte des Kühlbalkens, gesehen senkrecht zur Austrittsrichtung des Kühlmediums, einen nichtlinearen Verlauf, vorzugsweise einen S-förmigen Verlauf, aufweisen. The slot is preferably delimited by at least two sections of the cooling bar, wherein the at least two sections of the cooling bar, viewed perpendicular to the outlet direction of the cooling medium, have a non-linear course, preferably an S-shaped course.
Das vorgeschlagene Konzept bzw. der vorgeschlagene Kühlbalken eignet sich für Grobblechwalzwerke, in Warmbandstraßen und in Wärmebehandlungslinien insbesondere für Stahlwerkstoffe. Gleichermaßen ist allerdings auch eine Anwendung für NE-Metalle möglich. Insbesondere ist auch eine Anwendung in Quetten mit Schlitzdüsen-Kühlbalken zur Kühlwasserbeaufschlagung möglich. Es wird somit ein Kühlbalken mit einer Schlitzdüse und einer über die Breite veränderbare Düsengeometrie zur Verfügung gestellt. Damit ist es möglich, anhand definierter Vorgaben die Düsengeometrie gezielt zu beeinflussen, und zwar während des Kühlprozesses selber. The proposed concept or the proposed cooling beam is suitable for heavy plate rolling mills, in hot strip mills and in heat treatment lines, especially for steel materials. Equally, however, an application for non-ferrous metals is possible. In particular, an application in Quetten with slot jet cooling bars for cooling water is possible. There is thus provided a chilled beam with a slot nozzle and a variable width nozzle geometry. This makes it possible to use Defined specifications to influence the nozzle geometry targeted, during the cooling process itself.
Die vorliegende Erfindung stellt also Kühlbalken mit Schlitzdüsen zur Verfügung, wobei die Düsengeometrie und somit der Volumenstrom über der Breite des zu kühlenden Guts im laufenden Betrieb verändert werden kann. Somit kann ein Regelungssystem realisiert werden, welches Vorgaben für eine vorgesehene Aktorik macht. Bevorzugt besteht die Schlitzdüse des vorgeschlagenen Kühlbalkens aus mindestens zwei Teilen, wobei mindestens ein Teil der Düse beweglich ausgeführt ist. Die Veränderung der Schlitzgeometrie kann beispielsweise über eine Zustellung eines Düsenteils in Richtung auf das andere zu erfolgen. Diese Zustellung kann ungleichmäßig über die Düsenbreite erfolgen. So kann beispielsweise zu den Kanten hin weniger Kühlwasser beaufschlagt werden. Dies hilft zur Beseitigung des oben angesprochenen Nachteils. The present invention thus provides cooling bars with slot nozzles, wherein the nozzle geometry and thus the volume flow over the width of the material to be cooled during operation can be changed. Thus, a control system can be realized, which makes specifications for a proposed actuator. Preferably, the slot nozzle of the proposed cooling beam consists of at least two parts, wherein at least a part of the nozzle is designed to be movable. The change in the slot geometry can be done for example via a delivery of a nozzle part in the direction of the other. This delivery can be uneven over the nozzle width. For example, less cooling water can be applied to the edges. This helps to eliminate the above-mentioned disadvantage.
Eine weitere Möglichkeit ist es, die Düsenteile mit einer speziellen Kontur, insbesondere mit einer S-förmigen Geometrie, zu versehen und den Düsenspalt dann über eine axiale Verschiebung der Teile gegeneinander zu verändern. Another possibility is to provide the nozzle parts with a special contour, in particular with an S-shaped geometry, and then to change the nozzle gap against each other via an axial displacement of the parts.
Die Verstellung des Schlitzes kann dabei manuell oder automatisch erfolgen. Für eine automatische Schlitzverstellung und die damit mögliche variable Wasser- Beaufschlagung über die Blechbreite ist eine Aktorik vorgesehen. Diese Aktorik erhält die Anstellwerte bevorzugt von einem Automatisierungssystem (Regelungssystem). Das Automatisierungssystem erhält Informationen über die Blechabmessungen und die Materialgüte (Primärdaten), Soll-Eigenschaften (Härte, Festigkeit etc.) Daten von Prozesssensoren (Materialtemperaturen, Ist-Ebenheiten etc.) vor, in und hinter der Kühleinrichtung und erreichte Ist-Eigenschaften nach dem Prozess. Mit diesen Informationen ist das System in der Lage, Verstellwerte an die Aktorik zu senden. Durch diesen kontinuierlichen Rückfluss der Ist- Eigenschaften ist es möglich, die Werte so zu wählen, dass sich eine homogene Verteilung der Blecheigenschaften insbesondere über der Breite einstellt. Es ist aber auch möglich, gezielt unterschiedliche Eigenschaften über der Blechbreite einzustellen. The adjustment of the slot can be done manually or automatically. An actuator system is provided for automatic slot adjustment and the possible variable application of water across the plate width. This actuator system preferably receives the adjustment values from an automation system (control system). The automation system receives information about the sheet metal dimensions and material quality (primary data), target properties (hardness, strength, etc.) data from process sensors (material temperatures, actual flatness, etc.) before, in and behind the cooling device and achieved actual properties after the Process. With this information, the system is able to send adjustment values to the actuators. Through this continuous reflux of the actual properties, it is possible to choose the values such that a homogeneous distribution of the sheet properties especially over the width. But it is also possible to set specifically different properties over the sheet width.
Es kann (trotz Filter in den Zuläufen der Kühlbalken) immer wieder Vorkommen, dass es zu Verstopfungen bzw. Ablagerungen bei Kühlwasserdüsen kommt. Durch die Verstellung des Düsenspalts der Schlitzdüse kann der Düsenspalt geöffnet werden, wodurch Verunreinigungen beispielsweise in Form von Klumpen oder Plättchen aus dem Schlitz gespült werden können. Die vorgeschlagene Lösung ermöglicht es, die Geometrie eine Schlitzdüse variabel einzustellen bzw. zu verstellen. Diese Verstellung kann im laufenden Betrieb auch während des Kühlens eines Gutes (Blechs) erfolgen. Dadurch ist es möglich, dem Blechkopf bzw. Blechfuß eine unterschiedliche Wasserbeaufschlagung zukommen zu lassen. It can (despite filters in the inlets of the chilled beams) occur again and again that it leads to blockages or deposits in cooling water nozzles. By adjusting the nozzle gap of the slot nozzle, the nozzle gap can be opened, whereby impurities can be flushed out of the slot, for example in the form of lumps or platelets. The proposed solution makes it possible to variably adjust or adjust the geometry of a slot nozzle. This adjustment can take place during operation also during the cooling of a good (sheet metal). This makes it possible to give the sheet metal head or sheet metal foot a different water supply.
Des weiteren kann eine Regelung vorgesehen werden, die abhängig von verschiedenen Prozess- und Vorgabewerten Sollwerte für die Steuerung der Düsengeometrie vorgibt. Durch diese Maßnahmen können eine bessere Ebenheit und optimierte Material eigenschaften beim Kühlprozess erreicht werden. Furthermore, a control can be provided which predetermines desired values for the control of the nozzle geometry as a function of various process and default values. Through these measures, a better flatness and optimized material properties can be achieved in the cooling process.
Durch die vorgeschlagene Lösung wird es möglich, das seitlich ablaufende Kühlmedium gezielt so zu steuern, dass eine gewünschte Kühlung über die Breite eines Bandes erfolgt. Somit kann insbesondere eine gleichmäßige Abkühlung über der Bandbreite erreicht werden. The proposed solution makes it possible to specifically control the cooling medium flowing on the side in such a way that a desired cooling takes place across the width of a band. Thus, in particular a uniform cooling over the bandwidth can be achieved.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt. Es zeigen: Fig. 1 schematisch die Seitenansicht eines Kühlbalkens, dargestellt im Schnitt, der ein in Förderrichtung vorbeilaufendes metallisches Gut kühlt, Fig. 2a den Schlitz des Kühlbalkens, gesehen in Austrittsrichtung des Kühlmediums, in einer ersten Relativposition zweier Abschnitte des Kühlbalkens und In the drawing, an embodiment of the invention is shown. 1 shows schematically the side view of a cooling bar, shown in section, which cools a metallic material passing in the conveying direction, 2a shows the slot of the cooling beam, seen in the discharge direction of the cooling medium, in a first relative position of two sections of the cooling beam and
Fig. 2b den Schlitz des Kühlbalkens gemäß Figur 2a in einer zweiten, verschobenen Relativposition der Abschnitte des Kühlbalkens. FIG. 2b shows the slot of the cooling beam according to FIG. 2a in a second, displaced relative position of the sections of the cooling beam.
In Figur 1 ist ein Kühlbalken 2 zu sehen, unter dem in eine Förderrichtung F ein metallisches Gut 1 in Form eines Metallbandes verläuft und über Kühlmedium, welches vom Kühlbalken 2 ausgebracht wird, gekühlt wird. Die horizontale Richtung Q quer zur Förderrichtung F steht senkrecht auf der Zeichenebene in Figur 1. FIG. 1 shows a cooling bar 2 under which a metallic material 1 in the form of a metal strip runs in a conveying direction F and is cooled by cooling medium which is discharged from the cooling bar 2. The horizontal direction Q transverse to the conveying direction F is perpendicular to the plane of the drawing in FIG.
In an sich bekannter Weise hat der Kühlbalken 2 einen Schlitz 3, der sich über die gesamte Breite des metallischen Guts 2, also in Richtung Q erstreckt und dabei - gemessen in Förderrichtung F - eine Breite B aufweist. In known manner, the cooling beam 2 has a slot 3, which extends over the entire width of the metallic Guts 2, ie in the direction Q and thereby - measured in the conveying direction F - has a width B.
Wie Figur 1 entnommen werden kann, ist die Austrittsrichtung A des Kühlmediums unter einem gewissen Winkel zur Oberfläche des Guts 1 angeordnet, was allerdings nichts am Sachverhalt ändert, dass die Breite B sich über einen gewissen Betrag in Förderrichtung F erstreckt. As can be seen from Figure 1, the outlet direction A of the cooling medium is arranged at a certain angle to the surface of the product 1, which, however, does not change the fact that the width B extends over a certain amount in the conveying direction F.
Wesentlich ist, dass der Schlitz 3 des Kühlbalkens 2 während des Kühlvorgangs in Bezug auf seine Breite B verändert werden kann, wozu Verstellmittel 8 vorgesehen sind. Diese sind nur schematisch in Figur 1 angedeutet und können beliebiger Art (elektrisch, pneumatisch, hydraulisch) sein. It is essential that the slot 3 of the cooling bar 2 during the cooling process in relation to its width B can be changed, for which purpose adjusting means 8 are provided. These are indicated only schematically in Figure 1 and may be of any type (electric, pneumatic, hydraulic).
Durch besagte Verstellmittel können zwei Abschnitte 4 und 5 des Kühlbalkens 2 relativ zueinander bewegt bzw. verstellt werden, d. h. einer der Abschnitte, im Ausführungsbeispiel Abschnitt 5, wird in eine Zustellrichtung Z bewegt, um die Breite B des Schlitzes 3 einzustellen. By means of said adjusting means, two sections 4 and 5 of the cooling bar 2 can be moved or displaced relative to each other, ie. H. one of the sections, in the embodiment section 5, is moved in a feed direction Z to adjust the width B of the slot 3.
In Figur 1 ist angedeutet, dass eine physikalische Größe (es kann sich um die Planheit des Guts 1 oder um dessen Temperatur handeln) mittels eines Sensors 10 erfasst und der gemessene Wert einer Steuerung 9 zugeführt wird. Diese kann aufgrund eines in ihr gespeicherten Algorithmus dann ein Steuersignal an die Verstellmittel 8 geben, mit dem eine bestimmte Breite B eingestellt wird, so dass eine gewünschte Eigenschaft des Guts 1 erreicht werden kann. Es kann also im geschlossenen Regelkreis dafür Sorge getragen werden, dass die Breite B des Schlitzes 3 des Kühlbalkens so eingestellt wird, dass sich eine gewünschte Eigenschaft des Guts 1 ergibt. In FIG. 1, it is indicated that a physical variable (it can be the flatness of the product 1 or its temperature) can be determined by means of a sensor 10 detected and the measured value of a controller 9 is supplied. On the basis of an algorithm stored in it, this can then give a control signal to the adjusting means 8, with which a specific width B is set, so that a desired property of the product 1 can be achieved. It can thus be ensured in a closed loop that the width B of the slot 3 of the cooling bar is set so that there is a desired property of the product 1.
Eine spezielle und bevorzugte Ausgestaltung der Abschnitte 4 und 5 des Kühlbalkens 2 geht aus den Figuren 2a und 2b hervor. A specific and preferred embodiment of the sections 4 and 5 of the cooling bar 2 is shown in FIGS. 2a and 2b.
Gesehen in Austrittsrichtung A des Kühlmediums, die in den Figuren 2a und 2b senkrecht auf der Zeichenebene steht, weisen die beiden Abschnitte 4, 5 konkave Teile 6 und konvexe Teile 7 auf, so dass sich der dargestellte S-förmige Verlauf der Begrenzung des Schlitzes 3 ergibt. Seen in the exit direction A of the cooling medium, which is perpendicular to the plane in Figures 2a and 2b, the two sections 4, 5 concave parts 6 and convex parts 7, so that the illustrated S-shaped course of the boundary of the slot. 3 results.
Während sich in Figur 2a die beiden Abschnitte 4 und 5 in einer Ausgangslage befinden und der Schlitz 3 hierbei eine weitgehend konstante (wenn auch gebogen verlaufende) Breite B aufweist, sind in Figur 2b die beiden Abschnitte 4 und 5 in Richtung Q relativ zueinander verschoben (der obere Abschnitt 4 wurde in Figur 2 nach rechts und der untere Abschnitt 5 nach links verschoben). Demgemäß hat sich die Form des Schlitzes 3 verändert. While in FIG. 2 a the two sections 4 and 5 are in a starting position and the slot 3 has a largely constant (although curved) width B, in FIG. 2 b the two sections 4 and 5 are displaced in the direction Q relative to one another (FIG. the upper portion 4 has been moved to the right in Figure 2 and the lower portion 5 to the left). Accordingly, the shape of the slot 3 has changed.
Wie aus Figur 2b ersichtlich, gelangt nun im mittleren Bereich des zu kühlenden Gutes infolge der größeren Breite B des Schlitzes 3 mehr Kühlmedium auf das Gut, während in den beiden Seitenbereichen des Blechs 1 bzw. Endbereichen des Schlitzes 3 eine geringere Breite vorliegt und somit weniger Kühlmedium austritt. As can be seen from Figure 2b, now passes in the central region of the material to be cooled due to the larger width B of the slot 3 more cooling medium on the good, while in the two side regions of the sheet 1 and end portions of the slot 3 is present a smaller width and thus less Coolant escapes.
Durch entsprechende Verschiebung der beiden Abschnitte 4 und 5 in Richtung Q kann also die Menge und die Verteilung des austretenden Kühlmediums beeinflusst und somit der Kühlprozess gesteuert bzw. geregelt werden. Dies erfolgt insbesondere während des Kühlvorgangs aktiv, so dass auf sich verändernde Umstände hinsichtlich des Prozesses durch Einflussnahme auf die Kühlung Einfluss genommen werden kann. By appropriate displacement of the two sections 4 and 5 in the direction Q, therefore, the amount and distribution of the exiting cooling medium can be influenced and thus the cooling process can be controlled or regulated. This is in particular active during the cooling process, so that it is possible to influence changing circumstances with regard to the process by influencing the cooling.
Bezugszeichenliste: LIST OF REFERENCE NUMBERS
1 metallisches Gut 1 metallic good
2 Kühlbalken 2 chilled beams
3 Schlitz des Kühlbalkens  3 slot of the cooling bar
4 Abschnitt des Kühlbalkens  4 section of the cooling bar
5 Abschnitt des Kühlbalkens  5 section of the cooling beam
6 konkaver Teil  6 concave part
7 konvexer Teil 7 convex part
8 Verstellmittel  8 adjusting means
9 Steuerung  9 control
10 Sensor  10 sensor
B Breite des Schlitzes B width of the slot
F Förderrichtung des Guts / des Kühlbalkens F conveying direction of the material / cooling bar
Z Zustellrichtung Z delivery direction
Q Richtung quer zur Förderrichtung  Q direction transverse to the conveying direction
A Austrittsrichtung des Kühlmediums A Exit direction of the cooling medium

Claims

Patentansprüche: claims:
1. Verfahren zum Kühlen eines metallischen Guts (1 ) durch Ausbringung eines Kühlmediums aus einem Kühlbalken (2) auf das Gut (1 ), wobei das Kühlmedium durch einen Schlitz (3) des Kühlbalkens (2) ausgebracht wird, dadurch gekennzeichnet, dass während des Kühlvorgangs die Breite (B) des Schlitzes (3) in1. A method for cooling a metallic material (1) by applying a cooling medium from a chilled beam (2) to the material (1), wherein the cooling medium through a slot (3) of the cooling beam (2) is applied, characterized in that during the cooling process, the width (B) of the slot (3) in
Förderrichtung (F) des Guts (1 ) oder des Kühlbalkens (2) verändert wird, um die Kühlleistung des Kühlmediums auf ein gewünschtes oder vorgegebenes Niveau zu steuern oder zu regeln. Conveying direction (F) of the material (1) or the cooling bar (2) is changed in order to control or regulate the cooling capacity of the cooling medium to a desired or predetermined level.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass der Schlitz (3) durch mindestens zwei Abschnitte (4, 5) des Kühlbalkens (2) begrenzt wird, wobei die mindestens zwei Abschnitte (4, 5) relativ zueinander in eine Zustellrichtung (Z) bewegt werden. 2. The method according to claim 1, characterized in that the slot (3) by at least two sections (4, 5) of the cooling bar (2) is limited, wherein the at least two sections (4, 5) relative to each other in a feed direction (Z ) are moved.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Breite (B) des Schlitzes (3) in Richtung quer (Q) zur Förderrichtung (F) und senkrecht zur Austrittsrichtung (A) des Kühlmediums abschnittsweise unterschiedlich verändert wird. 3. The method according to claim 1 or 2, characterized in that the width (B) of the slot (3) in the direction transversely (Q) to the conveying direction (F) and perpendicular to the outlet direction (A) of the cooling medium is changed differently in sections.
4. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die beiden Abschnitte (4, 5) des Kühlbalkens (2), gesehen senkrecht zur Austrittsrichtung (A) des Kühlmediums, einen nichtlinearen Verlauf aufweisen. 4. The method according to claim 2 or 3, characterized in that the two sections (4, 5) of the cooling bar (2), as seen perpendicular to the outlet direction (A) of the cooling medium, have a non-linear course.
io io
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die beiden Abschnitte (4, 5) des Kühlbalkens (2), gesehen senkrecht zur Austrittsrichtung (A) des Kühlmediums, jeweils einen konkaven (6) und einen sich hieran anschließenden konvexen (7) Teil aufweisen. 5. The method according to claim 4, characterized in that the two sections (4, 5) of the cooling bar (2), viewed perpendicular to the outlet direction (A) of the cooling medium, each having a concave (6) and a subsequent thereto convex (7) Part have.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die mindestens zwei Abschnitte (4, 5) des Kühlbalkens (2) zur Veränderung der Breite (B) des Schlitzes (3) in eine Richtung senkrecht zur Austrittsrichtung (A) des Kühlmediums und senkrecht zur Förderrichtung (F) verschoben werden. 6. The method according to claim 5, characterized in that the at least two sections (4, 5) of the cooling bar (2) for changing the width (B) of the slot (3) in a direction perpendicular to the outlet direction (A) of the cooling medium and vertically be moved to the conveying direction (F).
7. Verfahren nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass die Breite (B) des Schlitzes (3) so eingestellt wird, dass die Breite in einem Mittenbereich des zu kühlenden Guts (1 ) größer ist als in den seitlichen7. The method according to any one of claims 3 to 6, characterized in that the width (B) of the slot (3) is adjusted so that the width in a central region of the material to be cooled (1) is greater than in the lateral
Endbereichen des zu kühlenden Guts (1 ). End areas of the material to be cooled (1).
8. Kühlbalken (2) zur Ausbringung eines Kühlmediums auf ein zu kühlendes Gut (1 ), wobei der Kühlbalken (2) einen Schlitz (3) aufweist, durch das Kühlmedium ausgebracht wird, dadurch gekennzeichnet, dass elektrische, pneumatische oder hydraulische Verstellmittel (8) vorhanden sind, mit denen die Breite (B) des Schlitzes (3) in Förderrichtung (F) des Guts (1 ) oder des Kühlbalkens (2) verändert werden kann. 8. cooling bar (2) for applying a cooling medium to a material to be cooled (1), wherein the cooling bar (2) has a slot (3) is discharged through the cooling medium, characterized in that electrical, pneumatic or hydraulic adjusting means (8 ) are provided, with which the width (B) of the slot (3) in the conveying direction (F) of the material (1) or the cooling bar (2) can be changed.
9. Kühlbalken nach Anspruch 8, dadurch gekennzeichnet, dass die Verstellmittel9. Chilled beam according to claim 8, characterized in that the adjusting means
(8) mit einer Steuerung (9) in Verbindung stehen, wobei mindestens ein mit der Steuerung (9) in Verbindung stehender Sensor (10) angeordnet ist, mit dem eine physikalische Eigenschaft des Guts (1 ) ermittelt werden kann. (8) are in communication with a controller (9), at least one with the Control (9) is arranged in connection sensor (10), with which a physical property of the Guts (1) can be determined.
10. Kühlbalken nach Anspruch 8 oder 9, dadurch gekennzeichnet, dass der Schlitz10. Chilled beam according to claim 8 or 9, characterized in that the slot
(3) durch mindestens zwei Abschnitte (4, 5) des Kühlbalkens (2) begrenzt wird, wobei die mindestens zwei Abschnitte (4, 5) des Kühlbalkens (2), gesehen senkrecht zur Austrittsrichtung (A) des Kühlmediums, einen nichtlinearen Verlauf, vorzugsweise einen S-förmigen Verlauf, aufweisen (3) is delimited by at least two sections (4, 5) of the cooling beam (2), the at least two sections (4, 5) of the cooling beam (2), viewed perpendicularly to the outlet direction (A) of the cooling medium, having a non-linear course, preferably an S-shaped curve
EP18804566.0A 2017-11-22 2018-11-15 Method for cooling a metallic item and cooling bar Active EP3713687B1 (en)

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WO2019101610A1 (en) 2019-05-31
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DE102017220891A1 (en) 2019-05-23
US20200362427A1 (en) 2020-11-19

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