EP1490524B2 - Method and device for convective heat transfer between a heat transfer medium and the surface of a workpiece - Google Patents

Method and device for convective heat transfer between a heat transfer medium and the surface of a workpiece Download PDF

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Publication number
EP1490524B2
EP1490524B2 EP03717150A EP03717150A EP1490524B2 EP 1490524 B2 EP1490524 B2 EP 1490524B2 EP 03717150 A EP03717150 A EP 03717150A EP 03717150 A EP03717150 A EP 03717150A EP 1490524 B2 EP1490524 B2 EP 1490524B2
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Prior art keywords
heat transfer
nozzle
transfer medium
coil
faces
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EP03717150A
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German (de)
French (fr)
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EP1490524B1 (en
EP1490524A2 (en
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Rolf-Josef Schwartz
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SCHWARTZ, EVA
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Priority claimed from DE10227499A external-priority patent/DE10227499A1/en
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    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
    • 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
    • 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

Definitions

  • the invention relates to a method for convective heat transfer between a heat transfer medium and the end faces of a wound metal strip in the form of a coil, wherein the end faces of the metal strip are acted upon by means of at least one rotatable nozzle wall with the heat transfer medium.
  • the invention further relates to an apparatus for carrying out the method for convective heat transfer between a heat transfer medium and the end faces of a wound metal strip.
  • German Patent 35 03 089 C2 is a device for uniform loading of a flat surface of a workpiece with a gas known.
  • the surface of the workpiece is in particular the end face of a cylindrical band collar.
  • the admission of the gas takes place via slot-shaped nozzle openings in a nozzle bottom, wherein the nozzle openings are at an angle to the surface of the band.
  • German Patent 196 50 965 C1 is a device for uniformly applying a flat surface of a workpiece with a fluid known.
  • the surface of the workpiece is preferably also the end face of a cylindrical band collar.
  • the nozzle bottom for the application of the fluid is designed such that at the nozzle openings means for deflecting the nozzle jets are provided in a direction which forms an angle with the perpendicular to the nozzle bottom or at a substantially plane nozzle bottom with its planar reference surface.
  • the object of the invention is therefore to provide a method for convective heat transfer between a heat transfer medium and a surface, in particular the front side of a metal strip in the form of a wound cylindrical coil, through which the most uniform and high heat transfer is realized, without causing adverse effects Workpiece comes.
  • the object of the invention is also to provide a device for carrying out the method.
  • this object is achieved in that in the convective heat transfer between a heat transfer medium and the end faces of a wound metal strip in the form of a coil both end faces of the metal strip are acted upon by the heat transfer means by means of a respective rotatable nozzle wall with the heat transfer medium, wherein the heat transfer medium through a plurality of nozzle openings Nozzle wall flows and move during the heat treatment both nozzle walls and the end faces of the metal strip to each other.
  • a generic device for convective heat transfer between a heat transfer medium and the end faces of a wound metal strip in the form of a coil means for acting on the end faces of the metal strip are provided with the heat transfer means by means of at least one rotatable nozzle wall, wherein on both end sides a rotatable nozzle wall is arranged in each case of the metal strip, and a nozzle wall has a plurality of nozzle openings, and both nozzle walls and the end faces of the metal strip are movable relative to one another during the heat treatment.
  • the nozzle walls are movable while the coil is fixed, or a design includes both movable nozzle walls and moving coils.
  • a design has been selected in which the nozzle walls are movable during the heat treatment and the coil is fixed.
  • a chamber furnace of known design is equipped so that at the two end faces of an inserted cylindrical coil each have a nozzle wall which is rotatable about an axis of rotation, wherein the axis of rotation preferably corresponds to the major axis of the cylindrical coil or substantially parallel to this.
  • the term "substantially” includes angles of the order of 0 ° and 10 °.
  • the rotatable nozzle walls are provided with a plurality of nozzles whose arrangement and design is suitable for the purpose selected. For example, known hole, tube, slot and / or twist nozzles can be used.
  • a gas is conveyed as a heat transfer medium via a pressure box in the nozzle walls and flows through the nozzles on the end faces of the coil to be heated or cooled. Due to the rotation of the nozzle walls, the two end faces are uniformly charged with the gas, so that a very good heat transfer is ensured on the surface. Furthermore, due to the uniform application, there are no local temperature peaks or sinks at which areas of the workpiece to be treated are overheated or undercooled.
  • FIG. 1 is a section through a particularly preferred embodiment of a device for convective heat transfer between a heat transfer medium and a surface, in particular the end face of a wound metal strip in the form of a cylindrical coil shown.
  • a heat transfer medium a fluid or a gas may be used.
  • a gas is used for heat transfer.
  • the device comprises a pressure box 20 into which the coil 30 to be heated or cooled is introduced.
  • the coil is a cylindrically wound metal band.
  • the metal strip shown is wound around an axis 70, which runs horizontally in the figure, so that plane surfaces result on the end faces 31 and 32 of the coil.
  • a nozzle wall 10 and 11 is located substantially parallel to these end faces of the coil.
  • the mobility of the nozzle walls and the end faces of the coil to each other is achieved in the illustrated embodiment by movable nozzle walls, while the coil is fixed during the heat treatment.
  • the nozzle walls 10 and 11 are rotatable about a rotation axis 71, which preferably corresponds to the main axis 70 of the cylindrical coil 30 or extends substantially parallel thereto.
  • the rotation of the nozzle walls via a drive 40, the in Fig. 1 is not shown in detail, but is characterized by ellipsoid motion arrows.
  • the gas for heating or cooling of the coils are introduced into the pressure box 20.
  • the gas may be different types of gas suitable for the particular application.
  • N 2 , N 2 H 2 , air, water vapor, inert gas, hydrogen, exogas, or endogas can be used.
  • the flow of the gas within the pressure box is indicated graphically by arrows.
  • the gas flows through the nozzle walls 10 and 11 on each one end side of the coil.
  • the nozzle walls have for this purpose a plurality of openings, which may be formed differently.
  • slot nozzles 50 were selected, as shown in the figure Fig. 2 can be seen.
  • the gas flows out of the nozzle openings and bounces on the front sides of the coil, where the heat transfer takes place. This applies both to the heating and to the cooling of the coil material.
  • the seal can be adapted to the requirements in various ways.
  • the sealing gap can be low or the seal can be designed as a labyrinth or contact seal.
  • Fig. 2 is a plan to refer to a pressure chamber 20 with a circular nozzle wall 10.
  • the rotating nozzle wall is designed in this embodiment with slot nozzles 50.
  • other types of nozzles such as perforated, tubular or swirl nozzles can be used.
  • Pipe nozzles may be provided, for example, with an inner swirl body, as in Fig. 4 is shown.
  • FIG. 3 In the picture in Fig. 3 is a particularly preferred embodiment of a chamber furnace with integrated erfindunmonuxer device for heat transfer shown.
  • the pressure box 20 is located within the furnace and a coil 30 to be heated or cooled is positioned between the two nozzle walls 10 and 11.
  • the charging of the furnace with a coil takes place in this embodiment from below, which is shown graphically below the chamber of the furnace by dashed lines.
  • the control of the chamber furnace preferably takes place via control means with a program which expediently controls and regulates at least the temperature and the speed of the heat transfer medium in such a way that the best possible heat transfer is achieved. If an embodiment is selected with nozzle walls that are movable along their axis of rotation, the distance between the nozzle wall and end face of the coil can also be controlled and regulated so that the best possible flow adjusts.
  • FIG. 4 A preferred embodiment of one of the nozzles arranged in the nozzle walls 10, 11 is shown in the form of a pipe nozzle 81 with a swirl body 82 arranged therein.
  • the inventive design of a device with nozzle walls which are designed to be movable to the end faces of the coils to be heated or cooled, has various advantages.
  • uniformly charging the coil with the gas there are no temperature peaks or sinks, which could lead to a deterioration of the coil material.
  • the uniform loading of the coil with the heat transfer medium also leads to a better heat transfer than in conventional systems, whereby the residence time of the workpieces can be lowered in the ovens. This allows energy savings and a reduction in throughput times.
  • the installation of a separating nozzle box additionally improves the degree of utilization of the system.

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

Abstract

The invention relates to a method and a device for convective heat transfer between a heat transfer medium and a surface, in particular the front face of a wound metal strip in the form of a coil, said surface being impinged upon by the heat transfer medium by means of at least one nozzle wall. The heat transfer medium can be a fluid or a gas. The device is characterised in that at least one of the nozzle walls (10; 11) and the surface to be impinged are mutually mobile during the heat treatment. In a preferred embodiment of the invention, the nozzle walls can be rotated about a rotational axis (71), which corresponds to the primary axis (70) of the coil, or is substantially parallel to said primary axis.

Description

Die Erfindung betrifft ein Verfahren zur konvektiven Wärmeübertragung zwischen einem Wärmeübertragungsmittel und den Stirnflächen eines gewickelten Metallbandes in Form eines Coils, wobei die Stirnflächen des Metallbandes mittels wenigstens einer drehbaren Düsenwand mit dem Wärmeübertragungsmittel beaufschlagt werden.The invention relates to a method for convective heat transfer between a heat transfer medium and the end faces of a wound metal strip in the form of a coil, wherein the end faces of the metal strip are acted upon by means of at least one rotatable nozzle wall with the heat transfer medium.

Die Erfindung betrifft ferner eine Vorrichtung zur Durchführung des Verfahrens zur konvektiven Wärmeübertragung zwischen einem Wärmeübertragungsmittel und den Stirnflächen eines gewickelten Metallbandes.The invention further relates to an apparatus for carrying out the method for convective heat transfer between a heat transfer medium and the end faces of a wound metal strip.

Bei der Wärmebehandlung von Werkstücken spielt die Wärmeübertragung durch erzwungene Konvektion eine große Rolle, da sich durch sie große Leistungen übertragen und gleichmäßige Temperaturverteilungen erreichen lassen.In the heat treatment of workpieces, forced convection heat transfer plays an important role, as it allows them to transmit high powers and achieve uniform temperature distributions.

In der Praxis ist bei diesem Verfahren des Wärmeübergangs von einem strömenden Fluid oder Gas auf ein Werkstück eine besonders gleichmäßige Beaufschlagung des Werkstücks mit dem jeweiligen Wärmeübertragungsmittel erforderlich, da hier ein gleichmäßiger Wärmeübergang gewährleistet sein muss, ohne dass Unterschiede im örtlichen Wärmeübergang zu einer unterschiedlichen Aufheizung des Werkstücks führen. Die gleichmäßige Beaufschlagung stellt beispielsweise beim Erwärmen von Metallbändern, welche zu zylindrischen Coils aufgewickelt sind, ein großes Problem dar. Die Erwärmung derartiger Coils erfolgt typischerweise in Kammeröfen, in denen zur Verringerung der Glühzeit der Werkstücke ein möglichst hoher Wärmeübergang angestrebt wird. Je nach verwendetem Beblasungssystem im Kammerofen kann es jedoch zu großen örtlichen Unterschieden im Wärmeübergang kommen, was zu lokalen Überhitzungen des Werkstücks führt. Dies wiederum verursacht Werkstoffbeschädigungen beispielsweise in Form von Verfärbungen oder Beeinträchtigungen der angestrebten metallurgischen Eigenschaften der Metallbänder. Eine ähnliche Problematik gilt für den konvektiven Wärmeübergang beim Kühlen eines Werkstücks, bei dem es zu örtlichen Unterkühlungen kommen kann.In practice, in this method of heat transfer from a flowing fluid or gas to a workpiece a particularly uniform loading of the workpiece with the respective heat transfer medium is required, since a uniform heat transfer must be ensured without differences in the local heat transfer to a different heating of the Lead workpiece. The uniform application is, for example, when heating metal strips, which are wound into cylindrical coils, a major problem. The heating of such coils is typically in chamber furnaces in which the highest possible heat transfer is sought to reduce the annealing time of the workpieces. Depending on the Beblasungssystem used in the chamber furnace, however, there may be large local differences in heat transfer, resulting in local overheating of the workpiece. This in turn causes material damage, for example in the form of discoloration or impairment of the desired metallurgical properties of the metal strips. A similar problem applies to the convective heat transfer when cooling a workpiece, which can lead to local undercooling.

Aus der Praxis der konvektiven Erwärmung von Metallbändern in Form von gewickelten Coils sind feststehende Düsenwände bekannt, über die ein Fluid oder Gas auf die Stirnfläche eines zylindrischen Coils geführt wird. Zur Verbesserung des Wärmeübergangs werden beispielsweise Loch-, Rohr-, Schlitz- oder Dralldüsen verwendet.From the practice of convective heating of metal strips in the form of wound coils fixed nozzle walls are known, via which a fluid or gas is fed to the end face of a cylindrical coil. To improve the heat transfer, for example, perforated, tubular, slot or swirl nozzles are used.

Aus der Deutschen Patentschrift 35 03 089 C2 ist eine Vorrichtung zur gleichmäßigen Beaufschlagung einer planen Oberfläche eines Werkstückes mit einem Gas bekannt. Bei der Oberfläche des Werkstücks handelt es sich insbesondere um die Stirnfläche eines zylindrischen Bandbundes. Die Beaufschlagung mit dem Gas erfolgt über schlitzförmige Düsenöffnungen in einem Düsenboden, wobei die Düsenöffnungen in einem Winkel zur Oberfläche des Bandbundes stehen.From the German Patent 35 03 089 C2 is a device for uniform loading of a flat surface of a workpiece with a gas known. The surface of the workpiece is in particular the end face of a cylindrical band collar. The admission of the gas takes place via slot-shaped nozzle openings in a nozzle bottom, wherein the nozzle openings are at an angle to the surface of the band.

Aus der Deutschen Patentschrift 196 50 965 C1 ist eine Vorrichtung zur gleichmäßigen Beaufschlagung einer planen Oberfläche eines Werkstücks mit einem Fluid bekannt. Bei der Oberfläche des Werkstücks handelt es sich vorzugsweise ebenfalls um die Stirnfläche eines zylindrischen Bandbundes. Der Düsenboden zur Beaufschlagung mit dem Fluid ist so ausgestaltet, dass an den Düsenöffnungen Einrichtungen zur Ablenkung der Düsenstrahlen in eine Richtung vorgesehen sind, welche mit der Senkrechten auf den Düsenboden oder bei einem im Wesentlichen planen Düsenboden mit dessen ebener Bezugsfläche einen Winkel bildet.From the German Patent 196 50 965 C1 is a device for uniformly applying a flat surface of a workpiece with a fluid known. The surface of the workpiece is preferably also the end face of a cylindrical band collar. The nozzle bottom for the application of the fluid is designed such that at the nozzle openings means for deflecting the nozzle jets are provided in a direction which forms an angle with the perpendicular to the nozzle bottom or at a substantially plane nozzle bottom with its planar reference surface.

Ferner ist es auf dem Gebiet des Abschreckens metallischer Werkstücke bekannt, abzuschreckende Bauteile auf einem Rost anzuordnen, über dem sich ein rotierendes Düsenfeld befindet, wie es beispielsweise in der Europäischen Patentschrift EP 0 796 920 B1 offenbart ist. In den bekannten Einrichtungen zur Gaserwärmung und Gaskühlung von Coils ist das Problem der lokalen Überhitzung oder Unterkühlung jedoch noch nicht vollständig gelöst, da trotz verschiedener Düsenformen und -anordnungen kein gleichmäßiger Wärmeübergang erreicht wird.Further, in the field of quenching metallic workpieces, it is known to place components to be quenched on a grate over which a rotating nozzle array is located, as shown for example in US Pat European Patent EP 0 796 920 B1 is disclosed. However, in the known devices for gas heating and gas cooling of coils, the problem of local overheating or undercooling has not yet been completely solved since, despite various nozzle shapes and arrangements, no uniform heat transfer is achieved.

Aufgabe der Erfindung ist es daher, ein verfahren zur konvektiven Wärmeübertragung zwischen einem Wärmeübertragungsmittel und einer Oberfläche, insbesondere der Stirnseite eines Metallbands in Form eines gewickelten zylindrischen Coils, bereitzustellen, durch das ein möglichst gleichmäßiger und hoher Wärmeübergang realisiert wird, ohne dass es zu Beeinträchtigungen des Werkstücks kommt.The object of the invention is therefore to provide a method for convective heat transfer between a heat transfer medium and a surface, in particular the front side of a metal strip in the form of a wound cylindrical coil, through which the most uniform and high heat transfer is realized, without causing adverse effects Workpiece comes.

Aufgabe der Erfindung ist es ferner, eine Vorrichtung zur Durchführung des Verfahrens bereitzustellen.The object of the invention is also to provide a device for carrying out the method.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, dass bei der konvektiven Wärmeübertragung zwischen einem Wärmeübertragungsmittel und den Stirnflächen eines gewickelten Metallbandes in Form eines Coils beide Stirnflächen des Metallbandes mit dem Wärmeübertragungsmittel mittels jeweils einer drehbaren Düsenwand mit dem Wärmeübertragungsmittel beaufschlagt werden, wobei das Wärmeübertragungsmittel durch mehrere Düsenöffnungen einer Düsenwand strömt und sich während der Wärmebehandlung beide Düsenwände und die Stirnseiten des Metallbandes zueinander bewegen.According to the invention this object is achieved in that in the convective heat transfer between a heat transfer medium and the end faces of a wound metal strip in the form of a coil both end faces of the metal strip are acted upon by the heat transfer means by means of a respective rotatable nozzle wall with the heat transfer medium, wherein the heat transfer medium through a plurality of nozzle openings Nozzle wall flows and move during the heat treatment both nozzle walls and the end faces of the metal strip to each other.

Die Aufgabe wird ferner dadurch gelöst, dass in einer gattungsgemäßen Vorrichtung zur konvektiven Wärmeübertragung zwischen einem Wärmeübertragungsmittel und den Stirnflächen eines gewickelten Metallbandes in Form eines Coils Mittel zur Beaufschlagung der Stirnflächen des Metallbandes mit dem Wärmeübertragungsmittel mittels wenigstens einer drehbaren Düsenwand vorgesehen sind, wobei an beiden Stirnseiten des Metallbandes jeweils eine drehbare Düsenwand angeordnet ist, und eine Düsenwand mehrere Düsenöffnungen aufweiset und beide Düsenwände und die Stirnseiten des Metallbandes während der Wärmebehandlung zueinander bewegbar sind.The object is further achieved in that in a generic device for convective heat transfer between a heat transfer medium and the end faces of a wound metal strip in the form of a coil means for acting on the end faces of the metal strip are provided with the heat transfer means by means of at least one rotatable nozzle wall, wherein on both end sides a rotatable nozzle wall is arranged in each case of the metal strip, and a nozzle wall has a plurality of nozzle openings, and both nozzle walls and the end faces of the metal strip are movable relative to one another during the heat treatment.

Zur Beweglichkeit der Düsenwände und Stirnflächen eines Coils zueinander während der Wärmebehandlung ergeben sich zwei mögliche Bauformen. Die Düsenwände sind beweglich ausgeführt, während das Coil fest steht, oder eine Bauform beinhaltet sowohl bewegliche Düsenwände als auch bewegliche Coils.For the mobility of the nozzle walls and faces of a coil to each other during the heat treatment, there are two possible designs. The nozzle walls are movable while the coil is fixed, or a design includes both movable nozzle walls and moving coils.

In einem besonders bevorzugten Ausführungsbeispiel der Erfindung, das im Folgenden beschrieben wird, wurde eine Bauform gewählt, bei der die Düsenwände während der Wärmebehandlung beweglich sind und das Coil fest steht. Ein Kammerofen bekannter Bauart ist dazu so ausgestattet, dass sich an den beiden Stirnseiten eines eingebrachten zylindrischen Coils jeweils eine Düsenwand befindet, die um eine Rotationsachse drehbar ist, wobei die Rotationsachse vorzugsweise der Hauptachse des zylindrischen Coils entspricht oder im Wesentlichen parallel zu dieser verläuft. Dabei umfasst der Ausdruck "Im Wesentlichen" Winkel in der Größenordnung von 0° und 10°.In a particularly preferred embodiment of the invention, which will be described below, a design has been selected in which the nozzle walls are movable during the heat treatment and the coil is fixed. A chamber furnace of known design is equipped so that at the two end faces of an inserted cylindrical coil each have a nozzle wall which is rotatable about an axis of rotation, wherein the axis of rotation preferably corresponds to the major axis of the cylindrical coil or substantially parallel to this. The term "substantially" includes angles of the order of 0 ° and 10 °.

Die drehbaren Düsenwände sind mit mehreren Düsen versehen, deren Anordnung und Ausführung geeignet für den Zweck wählbar ist. Es können beispielsweise bekannte Loch-, Rohr-, Schlitz- und/oder Dralldüsen verwendet werden. In dem dargestellten Ausführungsbeispiel der Erfindung wird als Wärmeübertragungsmittel ein Gas über einen Druckkasten in die Düsenwände gefördert und strömt durch die Düsen auf die Stirnflächen des zu erwärmenden oder zu kühlenden Coils. Durch die Rotation der Düsenwände werden die beiden Stirnflächen gleichmäßig mit dem Gas beaufschlagt, so dass an der Oberfläche ein sehr guter Wärmeübergang gewährleistet ist. Ferner ergeben sich durch die gleichmäßige Beaufschlagung keine lokalen Temperaturspitzen oder -senken, bei denen Bereiche des zu behandelnden Werkstücks überhitzt oder unterkühlt werden.The rotatable nozzle walls are provided with a plurality of nozzles whose arrangement and design is suitable for the purpose selected. For example, known hole, tube, slot and / or twist nozzles can be used. In the illustrated embodiment of the invention, a gas is conveyed as a heat transfer medium via a pressure box in the nozzle walls and flows through the nozzles on the end faces of the coil to be heated or cooled. Due to the rotation of the nozzle walls, the two end faces are uniformly charged with the gas, so that a very good heat transfer is ensured on the surface. Furthermore, due to the uniform application, there are no local temperature peaks or sinks at which areas of the workpiece to be treated are overheated or undercooled.

Weitere Vorteile, Besonderheiten und zweckmäßige Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Darstellung eines bevorzugten Ausführungsbeispiels anhand der Abbildungen.Further advantages, features and expedient developments of the invention will become apparent from the dependent claims and the following description of a preferred embodiment with reference to the drawings.

Von den Abbildungen zeigt:

Fig. 1
einen Schnitt durch ein besonders bevorzugtes Ausführungsbeispiel einer Vorrichtung zur konvektiven Wärmeübertragung von einem Wärmeübertragungsmittel auf gewickelte Metallbänder;
Fig. 2
eine Stirnsicht auf eine Vorrichtung zur konvektiven Wärmeübertragung von einem Wärmeübertragungsmittel auf gewickelte Metallbänder;
Fig. 3
ein Ausführungsbeispiel eines Kammerofens mit integrierter erfindungsgemäßer Vorrichtung; und
Fig. 4
Rohrdüse mit innerem Drallkörper.
From the pictures shows:
Fig. 1
a section through a particularly preferred embodiment of a device for convective heat transfer from a heat transfer medium to wound metal bands;
Fig. 2
an end view of a device for convective heat transfer from a heat transfer medium to wound metal bands;
Fig. 3
an embodiment of a chamber furnace with integrated device according to the invention; and
Fig. 4
Pipe nozzle with internal swirl body.

In der Abbildung in Fig. 1 ist ein Schnitt durch ein besonders bevorzugtes Ausführungsbeispiel einer Vorrichtung zur konvektiven Wärmeübertragung zwischen einem Wärmeübertragungsmittel und einer Oberfläche, insbesondere der Stirnfläche eines gewickelten Metallband in Form eines zylindrischen Coils, dargestellt. Als Wärmeübertragungsmittel kann ein Fluid oder ein Gas zur Anwendung kommen. In diesem Ausführungsbeispiel wird zur Wärmeübertragung ein Gas verwendet.In the picture in Fig. 1 is a section through a particularly preferred embodiment of a device for convective heat transfer between a heat transfer medium and a surface, in particular the end face of a wound metal strip in the form of a cylindrical coil shown. As the heat transfer medium, a fluid or a gas may be used. In this embodiment, a gas is used for heat transfer.

Die Vorrichtung umfasst einen Druckkasten 20, in den das zu erwärmende oder zu kühlende Coil 30 eingebracht wird. Bei dem Coil handelt es sich um ein zylindrisch gewickeltes Metallband. Das dargestellte Metallband ist um eine Achse 70 gewickelt, die in der Abbildung waagerecht verläuft, so dass sich an den Stirnseiten 31 und 32 des Coils plane Oberflächen ergeben. Im Wesentlichen parallel zu diesen Stirnseiten des Coils befindet sich jeweils eine Düsenwand 10 und 11.The device comprises a pressure box 20 into which the coil 30 to be heated or cooled is introduced. The coil is a cylindrically wound metal band. The metal strip shown is wound around an axis 70, which runs horizontally in the figure, so that plane surfaces result on the end faces 31 and 32 of the coil. In each case a nozzle wall 10 and 11 is located substantially parallel to these end faces of the coil.

Die Beweglichkeit der Düsenwände und der Stirnflächen des Coils zueinander wird im dargestellten Ausführungsbeispiel durch bewegliche Düsenwände erreicht, während das Coil während der Wärmebehandlung fest steht. Die Düsenwände 10 und 11 sind dabei um eine Rotationsachse 71 drehbar, die vorzugsweise der Hauptachse 70 des zylindrischen Coils 30 entspricht oder im Wesentlichen parallel zu dieser verläuft. Die Rotation der Düsenwände erfolgt über einen Antrieb 40, der in Fig. 1 nicht im Detail dargestellt ist, sondern zeichnerisch durch ellipsoide Bewegungspfeile gekennzeichnet ist.The mobility of the nozzle walls and the end faces of the coil to each other is achieved in the illustrated embodiment by movable nozzle walls, while the coil is fixed during the heat treatment. The nozzle walls 10 and 11 are rotatable about a rotation axis 71, which preferably corresponds to the main axis 70 of the cylindrical coil 30 or extends substantially parallel thereto. The rotation of the nozzle walls via a drive 40, the in Fig. 1 is not shown in detail, but is characterized by ellipsoid motion arrows.

Das Gas zur Erwärmung oder Abkühlung der Coils kann beispielsweise mittels eines nicht dargestellten Ventilators in den Druckkasten 20 eingebracht werden. Bei dem Gas kann es sich um verschiedene Gasarten handeln, die sich für den jeweiligen Anwendungszweck eignen. Beispielsweise kann N2, N2H2, Luft, Wasserdampf, Schutzgas, Wasserstoff, Exogas, oder Endogas verwendet werden. Die Strömung des Gases innerhalb des Druckkastens ist zeichnerisch durch Pfeile gekennzeichnet. Das Gas strömt durch die Düsenwände 10 und 11 auf jeweils eine Stirnseite des Coils. Die Düsenwände weisen dazu mehrere Öffnungen auf, die verschieden ausgeformt sein können. Im dargestellten Ausführungsbeispiel wurden Schlitzdüsen 50 gewählt, wie sie der Abbildung in Fig. 2 zu entnehmen sind. Das Gas strömt aus den Düsenöffnungen und prallt auf die Stirnseiten des Coils, wo der Wärmeübergang stattfindet. Dies gilt sowohl für die Erwärmung als auch für die Abkühlung des Coilmaterials.The gas for heating or cooling of the coils, for example, by means of a fan, not shown, are introduced into the pressure box 20. The gas may be different types of gas suitable for the particular application. For example, N 2 , N 2 H 2 , air, water vapor, inert gas, hydrogen, exogas, or endogas can be used. The flow of the gas within the pressure box is indicated graphically by arrows. The gas flows through the nozzle walls 10 and 11 on each one end side of the coil. The nozzle walls have for this purpose a plurality of openings, which may be formed differently. In the illustrated embodiment, slot nozzles 50 were selected, as shown in the figure Fig. 2 can be seen. The gas flows out of the nozzle openings and bounces on the front sides of the coil, where the heat transfer takes place. This applies both to the heating and to the cooling of the coil material.

Um die Einrichtung beispielsweise auf die Abmessungen verschiedener Coils einstellen zu können, hat es sich als zweckmäßig erwiesen, die Düsenwände 10 und 11 zusätzlich beweglich entlang ihrer Rotationsachse 71 auszuführen. Dadurch lässt sich der Abstand 60 zwischen Düsenwänden und Stirnflächen des Coils auf die optimale Distanz für eine wirkungsvolle Anströmung einstellen. Der Antrieb 40 für diese Bewegung ist in Fig. 1 nicht im Detail dargestellt, sondern durch waagerechte Bewegungspfeile gekennzeichnet.In order to be able to set the device, for example, to the dimensions of different coils, it has proven to be expedient to additionally carry the nozzle walls 10 and 11 along their axis of rotation 71. As a result, the distance 60 between the nozzle walls and end faces of the coil can be adjusted to the optimum distance for an effective flow. The drive 40 for this movement is in Fig. 1 not shown in detail, but by horizontal Movement arrows marked.

Um trotz beweglicher Düsenwände die Dichtigkeit zwischen Düsenwänden und Druckkasten zu gewährleisten, kann die Dichtung auf verschiedene Weisen den Anforderungen angepasst werden. Beispielsweise kann der Dichtungsspalt gering oder die Dichtung als Labyrinth- oder Kontaktdichtung ausgeführt werden.In order to ensure the tightness between the nozzle walls and the pressure box despite the movable nozzle walls, the seal can be adapted to the requirements in various ways. For example, the sealing gap can be low or the seal can be designed as a labyrinth or contact seal.

Der Abbildung in Fig. 2 ist eine Aufsicht auf eine Druckkammer 20 mit einer kreisförmigen Düsenwand 10 zu entnehmen. Die rotierende Düsenwand ist in diesem Ausführungsbeispiel mit Schlitzdüsen 50 ausgeführt. Es können jedoch auch andere Düsentypen wie Loch-, Rohr- oder Dralldüsen verwendet werden. Rohrdüsen können beispielsweise mit einem inneren Drallkörper versehen sein, wie es in Fig. 4 dargestellt ist.The picture in Fig. 2 is a plan to refer to a pressure chamber 20 with a circular nozzle wall 10. The rotating nozzle wall is designed in this embodiment with slot nozzles 50. However, other types of nozzles such as perforated, tubular or swirl nozzles can be used. Pipe nozzles may be provided, for example, with an inner swirl body, as in Fig. 4 is shown.

In der Abbildung in Fig. 3 ist ein besonders bevorzugtes Ausführungsbeispiel eines Kammerofens mit integrierter erfindungemäßer Vorrichtung zur Wärmeübertragung dargestellt. Der Druckkasten 20 befindet sich innerhalb des Ofens und ein zu erwärmendes oder zu kühlendes Coil 30 ist zwischen den beiden Düsenwänden 10 und 11 positioniert. Die Beschickung des Ofens mit einem Coil erfolgt in diesem Ausführungsbeispiel von unten, was zeichnerisch unterhalb der Kammer des Ofens durch gestrichelte Linien dargestellt ist.In the picture in Fig. 3 is a particularly preferred embodiment of a chamber furnace with integrated erfindungemäßer device for heat transfer shown. The pressure box 20 is located within the furnace and a coil 30 to be heated or cooled is positioned between the two nozzle walls 10 and 11. The charging of the furnace with a coil takes place in this embodiment from below, which is shown graphically below the chamber of the furnace by dashed lines.

Im speziellen Fall von Coils mit sehr geringen Breiten kann der Nutzraum des Ofens mittels wenigstens eines nachrüstbaren Düsenkastens geteilt werden. So können zwei oder mehr Coils in den Nutzraum eingebracht und beidseitig beaufschlagt werden. Ein solcher zusätzlicher Düsenkasten ist in den Figuren 1-4 nicht dargestellt.
Die Steuerung des Kammerofens erfolgt vorzugsweise über Steuermittel mit einem Programm, das zweckmäßigerweise wenigstens die Temperatur und die Geschwindigkeit des Wärmeübertragungsmittels so steuert und regelt, dass sich ein möglichst optimaler Wärmeübergang einstellt. Wird eine Ausführungsform mit Düsenwänden gewählt, die entlang ihrer Rotationsachse beweglich sind, kann der Abstand zwischen Düsenwand und Stirnfläche des Coils ebenfalls so gesteuert und geregelt werden, dass sich eine möglichst optimale Anströmung einstellt.In the special case of coils with very small widths of the useful space of the furnace can be shared by means of at least one retrofit nozzle box. Thus, two or more coils can be introduced into the work space and acted upon on both sides. Such an additional nozzle box is in the Figures 1-4 not shown.
The control of the chamber furnace preferably takes place via control means with a program which expediently controls and regulates at least the temperature and the speed of the heat transfer medium in such a way that the best possible heat transfer is achieved. If an embodiment is selected with nozzle walls that are movable along their axis of rotation, the distance between the nozzle wall and end face of the coil can also be controlled and regulated so that the best possible flow adjusts.

In Fig. 4 ist eine bevorzugte Ausführung einer der in den Düserwänden 10,11 angeordneten Düsen in Formeiner Rohrdüse 81 mit darin angeordnetem Drallkörper 82 dargestellt.In Fig. 4 A preferred embodiment of one of the nozzles arranged in the nozzle walls 10, 11 is shown in the form of a pipe nozzle 81 with a swirl body 82 arranged therein.

Die erfindungsgemäße Ausführung einer Vorrichtung mit Düsenwänden, die zu den Stirnflächen des zu erwärmenden oder zu kühlenden Coils beweglich ausgeführt sind, weist verschiedene Vorteile auf. Durch die gleichmäßige Beaufschlagung des Coils mit dem Gas kommt es zu keinen Temperaturspitzen oder -senken, die zu einer Beeinträchtigung des Coilmaterials führen könnten. Es kommt beispielsweise zu keinen Verfärbungen oder Beeinträchtigungen der angestrebten metallurgischen Eigenschaften des gewickelten Metallbandes, so dass die gestellten Qualitätsanforderungen besser und einfacher erfüllt werden können.The inventive design of a device with nozzle walls, which are designed to be movable to the end faces of the coils to be heated or cooled, has various advantages. By uniformly charging the coil with the gas, there are no temperature peaks or sinks, which could lead to a deterioration of the coil material. For example, there is no discoloration or impairment of the desired metallurgical properties of the wound metal strip, so that the quality requirements can be met better and easier.

Die gleichmäßige Beaufschlagung des Coils mit dem Wärmeübertragungsmittel führt ferner zu einem besseren Wärmeübergang als in herkömmlichen Anlagen, wodurch die Verweilzeit der Werkstücke in den Öfen gesenkt werden kann. Dies ermöglicht Energieeinsparungen und eine Verkürzung der Durchlaufzeiten. Der Einbau eines Trenndüsenkastens verbessert den Nutzungsgrad der Anlage zusätzlich.The uniform loading of the coil with the heat transfer medium also leads to a better heat transfer than in conventional systems, whereby the residence time of the workpieces can be lowered in the ovens. This allows energy savings and a reduction in throughput times. The installation of a separating nozzle box additionally improves the degree of utilization of the system.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

10, 1110, 11
Düsenwändenozzle walls
2020
Druckkastenprint case
3030
Coilcoil
31, 3231, 32
Stirnflächen des CoilsEnd faces of the coil
4040
Antriebdrive
5050
Düsenöffnungenorifices
6060
Abstand zwischen Düsenwand und Stirnfläche des CoilsDistance between the nozzle wall and the end face of the coil
7070
Hauptachse des CoilsMain axis of the coil
7171
Rotationsachse der DüsenwändeRotation axis of the nozzle walls
8181
Rohrdüsepipe nozzle
8282
Drallkörperswirler

Claims (13)

  1. A method for convective heat transfer between a heat transfer medium and the faces of a wound metal tape in the form of a coil, whereby the faces of the metal tape are exposed to the heat transfer medium using at least one rotating nozzle wall, characterized in that both faces of the metal tape are each exposed to the heat transfer medium using a rotating nozzle wall (10; 11), whereby the heat transfer medium flows through several nozzle openings of a nozzle wall (10; 11), and both nozzle walls (10; 11) and the faces of the metal tape move towards each other during the heat treatment.
  2. A device for convective heat transfer between a heat transfer medium and the faces of a wound metal tape in the form of a coil, whereby the device has means for exposing the faces of the metal tape to the heat transfer medium using at least one rotating nozzle wall, characterized in that a rotating nozzle wall (10; 11) is arranged on both faces of the metal tape, whereby one nozzle wall (10; 11) has several nozzle openings and both nozzle walls (10; 11) and the faces of the metal tape can be moved towards each other during the heat treatment.
  3. The device according to Claim 2, characterized in that the nozzle walls (10; 11) can be rotated around an axis of rotation (71) that corresponds to the main axis (70) of a coil (30) or runs essentially parallel thereto, whereby the nozzle walls (10; 11) run essentially parallel to the faces (31; 32) of the coil.
  4. The device according to one or more of the preceding Claims 2 and 3, characterized in that the heat transfer medium is a fluid or a gas.
  5. The device according to one or more of Claims 2 to 4, characterized in that the device comprises at least one pressure box (20) containing at least one coil (30) and two nozzle walls (10; 11), whereby the nozzle walls are arranged on the faces (31; 32) of the coil (30).
  6. The device according to Claim 5, characterized in that a heat transfer medium can be fed through the pressure box (20) and the nozzle walls (10; 11) onto the faces (31; 32) of the coil (30).
  7. The device according to Claim 6, characterized in that a fan blows a gas into and/or through the pressure box (20).
  8. The device according to one or more of Claims 2 to 7, characterized in that the nozzle walls (10; 11) have slit, tube, hole and/or swirl nozzles (50).
  9. The device according to Claim 8, characterized in that the nozzle walls have tube nozzles (81), each of which is provided with an inner swirl element (82).
  10. The device according to one or more of Claims 5 to 9, characterized in that the seal between the nozzle walls (10; 11) and the pressure box (20) is configured as a labyrinth seal or contact seal.
  11. The device according to one or more of Claims 2 to 10, characterized in that the device has control means that control at least the temperature and the speed of the heat transfer medium.
  12. The device according to Claim 11, characterized in that the control means encompasses a control and regulation program that controls at least the temperature and the speed of the heat transfer medium.
  13. A kiln installation, characterized in that it has at least one device for convective heat transfer from a heat transfer medium to a surface, whereby the device is described by one or more of Claims 2 to 12.
EP03717150A 2002-03-15 2003-03-17 Method and device for convective heat transfer between a heat transfer medium and the surface of a workpiece Expired - Lifetime EP1490524B2 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10211749 2002-03-15
DE10211749 2002-03-15
DE10227499A DE10227499A1 (en) 2002-03-15 2002-06-19 Method and device for convective heat transfer between a heat transfer medium and the surface of a workpiece
DE10227499 2002-06-19
PCT/DE2003/000864 WO2003078665A2 (en) 2002-03-15 2003-03-17 Method and device for convective heat transfer between a heat transfer medium and the surface of a workpiece

Publications (3)

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EP1490524A2 EP1490524A2 (en) 2004-12-29
EP1490524B1 EP1490524B1 (en) 2005-08-24
EP1490524B2 true EP1490524B2 (en) 2009-01-21

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EP03717150A Expired - Lifetime EP1490524B2 (en) 2002-03-15 2003-03-17 Method and device for convective heat transfer between a heat transfer medium and the surface of a workpiece

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EP (1) EP1490524B2 (en)
AT (1) ATE302858T1 (en)
AU (1) AU2003221601A1 (en)
WO (1) WO2003078665A2 (en)

Citations (3)

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Publication number Priority date Publication date Assignee Title
DE3503089A1 (en) † 1985-01-30 1986-07-31 Carl Prof. Dr.-Ing. 5100 Aachen Kramer DEVICE FOR EVENLY APPLYING A TARGET SURFACE WITH A GAS
EP0796920A1 (en) † 1996-02-21 1997-09-24 Ipsen International GmbH Quenching device for metal workpieces
DE19650965C1 (en) † 1996-12-07 1998-08-13 Kramer Carl Device for uniformly applying a fluid to a flat surface of a workpiece

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05177240A (en) * 1992-01-07 1993-07-20 Nippon Steel Corp Method for cooling hot rolled coil
JP3370562B2 (en) * 1997-03-31 2003-01-27 川崎製鉄株式会社 Method and apparatus for cooling hot-rolled coil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3503089A1 (en) † 1985-01-30 1986-07-31 Carl Prof. Dr.-Ing. 5100 Aachen Kramer DEVICE FOR EVENLY APPLYING A TARGET SURFACE WITH A GAS
EP0796920A1 (en) † 1996-02-21 1997-09-24 Ipsen International GmbH Quenching device for metal workpieces
DE19650965C1 (en) † 1996-12-07 1998-08-13 Kramer Carl Device for uniformly applying a fluid to a flat surface of a workpiece

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* Cited by examiner, † Cited by third party
Title
BOUWMAN J.W.: "Einsatz von Vakuum-Öfen für das Härten von Werkzeugen", FACHBERICHTE HÜTTENPRAXIS METALLWEITERVERARBEITUNG, vol. HEFT 4, 1984, pages 1 - 7 †
BOUWMAN J.W.: "High-Pressure Gas-Quenching in vacuum furnaces - ...", METALLURGIA, vol. 52, no. 2, February 1985 (1985-02-01), pages 52 - 53 †
CONYBEAR J.A.: "Vacuum Hardening of H-13 Die Steels : ...", INDUSTRIAL HEATING, August 1993 (1993-08-01), pages 45 - 48 †
EDENHOFER B.; BOUWMAN J.W.: "Progress in Design and Use of Vacuum Furnaces with High Pressure Gas Quench Systems", INDUSTRIAL HEATING, February 1988 (1988-02-01), ENGLAND, pages 12 - 16 †

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WO2003078665A2 (en) 2003-09-25
AU2003221601A8 (en) 2003-09-29
EP1490524B1 (en) 2005-08-24
ATE302858T1 (en) 2005-09-15
WO2003078665A3 (en) 2003-12-18
EP1490524A2 (en) 2004-12-29
AU2003221601A1 (en) 2003-09-29

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