EP0637897A2 - Longitudinal field induction heating device for flat metallic pieces - Google Patents

Longitudinal field induction heating device for flat metallic pieces Download PDF

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Publication number
EP0637897A2
EP0637897A2 EP94111752A EP94111752A EP0637897A2 EP 0637897 A2 EP0637897 A2 EP 0637897A2 EP 94111752 A EP94111752 A EP 94111752A EP 94111752 A EP94111752 A EP 94111752A EP 0637897 A2 EP0637897 A2 EP 0637897A2
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EP
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Prior art keywords
inductors
inductor
conductor loops
another
effective sections
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EP94111752A
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German (de)
French (fr)
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EP0637897A3 (en
EP0637897B1 (en
Inventor
Dieter Dipl.-Ing. Schluckebier
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Otto Junker GmbH
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Otto Junker GmbH
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
    • H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/36—Coil arrangements

Definitions

  • the invention relates to a device for inductive longitudinal field heating of flat metal, such as Strips, plates or the like made of non-ferrous metal, steel or a ferromagnetic material, with at least two inductors fed with alternating current, in particular medium-frequency alternating current, which are each provided with conductor loops, the effective sections of which each generate an alternating magnetic field.
  • flat metal such as Strips, plates or the like made of non-ferrous metal, steel or a ferromagnetic material
  • a device for longitudinal field heating of steel strips is already known from US Pat. No. 2,448,011, in which the steel strip to be heated is guided through the interior of a cylindrical induction coil ("inductor") which generates an alternating magnetic field in the metal material, the lines of force of which are parallel run to the level of the metal goods (“longitudinal field principle”).
  • inductor cylindrical induction coil
  • the main advantage of the known device lies in the high uniformity of the heating over the entire width of the metal material, it being possible to achieve a uniform temperature distribution even with different widths of the metal material.
  • this device also has some disadvantages.
  • satisfactory heating efficiencies cannot be achieved if metal goods with different widths and thicknesses are to be heated.
  • replacement inductors are required in the known device in order to achieve good electrical efficiency even with different dimensions of the metal goods.
  • this is a very cumbersome and uneconomical process, since the entire system must be shut down and, for example, the metal strips usually attached to one another for continuous operation must be disconnected and reconnected after installing the replacement inductor. This results in significant production downtimes.
  • stray fields occur in the known device on the induction coil, which further reduce the electrical efficiency of this heating device.
  • inductors coil formers
  • this device it is possible to remove the inductors attached to a frame from the continuous metal material by means of a rail system. This makes the inductors easily accessible, for example for maintenance purposes, without having to cut through the metal material. In this device, however, no adaptation to different widths of metal is provided.
  • an induction device for longitudinal field heating of metallic material is known from US Pat. No. 37 25 629, in which individual conductor loops connected in parallel surround the material to be heated.
  • the inductor formed by these conductor loops is open on one side, so that the material to be heated can be introduced laterally through this opening into the inductor.
  • no adaptation to different metal goods widths is provided here either.
  • the present invention has for its object to design a device of the type mentioned in such a way that it can be adapted to the respective metal material width and is easily accessible from outside for cleaning and maintenance work in order to largely avoid production downtimes. It should also be achieved that the device can be manufactured inexpensively due to its design.
  • Such an arrangement of the inductors allows, on the one hand, an adaptation to the respective metal material width, since seen in this direction there is no spatial limitation of the inductor arrangement.
  • this device is easily accessible for maintenance work, for example.
  • an iron core By using an iron core, an increase in performance of the inductor for heating is ultimately achieved and, due to the bundling of the force lines that can be achieved thereby, a very compact design is also possible at the same time.
  • the effective sections of the conductor loops can have a straight or a course deviating from a straight line.
  • the device according to the invention can also be designed such that the effective sections of the conductor loops are arranged in grooves in the inductor cores. On the one hand, this enables an even more compact design of the inductor, and on the other hand improves the coupling of the magnetic lines of force to the iron core.
  • the device according to the invention can also be designed such that the inductors and the flat metal material can be moved relative to one another.
  • the inductors can be moved relative to plates or the like. It is equally possible to arrange the inductors statically and to move the flat metal material in the form of a band or the like.
  • the device according to the invention can also be designed such that the effective sections of the conductor loops of the inductors run longitudinally, transversely or at an angle to them in the direction of movement.
  • the individual pairs of inductors can each be brought into the optimal position for the material in question and its dimensions in order to bring about the desired uniformity of the heating in the metal material.
  • the device according to the invention can also be designed such that a plurality of pairs of inductors are arranged next to one another, their inductor cores being clamped to one another or being formed in one piece with one another.
  • the range of action of an inductor unit can thus be adapted to the respective requirements.
  • Such a unit then consists of several pairs of inductors, wherein the current direction in the effective sections of the conductor loops of adjacent inductors can be the same or opposite.
  • the electrical efficiency can be increased by such a type of arrangement of a plurality of inductors placed next to one another. With different electrical polarities of adjacent inductors, several areas are formed in the metal material in accordance with the number of inductors, in which closed eddy currents flow. Compared to a single closed eddy current path, this leads to an increased electrical power density in the metal material. By using several inductors next to each other, a good adjustment to the respective width of the metal is finally possible.
  • the device according to the invention can be designed such that inductor pairs can be clocked and switched at different times.
  • inductor pairs are used, one of which has only a small number of conductor loops and which is in the peripheral or intermediate position to other inductors. In this way, the formation of undesirable temperature shadows in the metal can be counteracted.
  • the device according to the invention can also be designed such that a plurality of inductor cores are arranged one behind the other in the direction of movement.
  • the effective sections of the conductor loops of the successive inductors in the direction of movement can have the same or different inclinations to the direction of transport, in order in this way to further help to even out the heating.
  • the device according to the invention can also be designed such that trim cores are assigned to the intermediate regions of two adjacent inductors. In this way, any temperature shadows in the area between inductors are compensated for.
  • the device according to the invention can also be designed such that the effective sections of the conductor loops of an inductor are connected in parallel with one another. In this way, the number of returns can be reduced and thus the construction costs can be reduced.
  • the device according to the invention can also be designed such that the effective sections of the conductor loops of an inductor pair lie in a common circuit.
  • the device according to the invention can also be designed such that the conductor loops for feedback are guided laterally on the respective inductor core.
  • the device according to the invention can also be designed such that the conductor loops form effective sections in two adjacent inductors.
  • the device according to the invention can be designed such that conductor loops of at least one inductor can be switched separately.
  • the device can be adapted to the width of the material to be heated, without requiring any modifications.
  • the inductors 1, 2 are identical to one another and each have an iron core 4, 5.
  • a receptacle 6 is provided, in which the active sections 7 of conductor loops (not shown here) are arranged to run parallel to one another. All active sections 7 of the conductor loops of the upper inductor 1 have current flowing through them in the same direction. This also applies to all effective sections 7 of the lower inductor 2, with the exception that the current direction is reversed here.
  • the active sections 7, the conductor loops can be embedded in the receptacles 6 in a suitable material or run in grooves, not shown here.
  • the embodiment of the device according to the invention according to FIG. 1 can be understood as a juxtaposition of two pairs of inductors according to FIG. 3.
  • the iron cores 4,5 are in one piece for the inductors 1,1 'and 2,2'.
  • all effective sections 7 of the conductor loops are arranged in grooves 9 of the iron cores 4, 5, the current direction in the effective sections 7 of the inductors 1, 2 'is the same.
  • the effective sections 7 in the inductors 2, 1 ' have the same current direction with one another, with the exception that the current flows here in the opposite direction to that in the inductors 1, 2'.
  • the effective sections 7 in the inductors 1 ', 2' have opposite polarity compared to inductors 1, 2. However, it is also possible to select the polarity of the inductors 1 ', 2' to be the same as that of the inductors 1, 2 and thus to bring about the same polarity above and below the metal material 3 in adjacent inductors.
  • the embodiment of the device according to FIG. 1 can be followed by a trimming core 10 in the region of the transition between the inductors 1, 1 'or 2.2' in order to compensate for temperature shadows that may occur here.
  • a trimming core 10 in the region of the transition between the inductors 1, 1 'or 2.2' in order to compensate for temperature shadows that may occur here. This is illustrated in FIG. 2, in which the arrow 11, like in FIG. 1, indicates the direction of movement of the metal material 3.
  • FIG. 4 is to be understood as a supplement to FIG. 1 by not only identifying the effective sections 7 of the conductor loops, but also their return. This takes place on the sides of the iron cores 4, 5 in recesses 19 provided there.
  • FIG. 5 shows an upper inductor 1 with an iron core 4 and a lower inductor 2 with an iron core 5. Grooves 9 are provided in the iron cores 4, 5, in which there are effective sections 7 of conductor loops. In this case, all active sections 7 of the upper inductor 1 are connected in parallel to one another in a circuit in which all active sections 7 are also connected in parallel to one another, but with opposite polarity.
  • Fig. 6 finally shows schematically two arranged one behind the other in the direction of movement (arrow 11) of the metal goods 3 Inductors 1, in which the effective sections of the conductor loops are offset from one another by 90 °.
  • All inductors are connected to a medium frequency AC source.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)
  • Furnace Details (AREA)

Abstract

The inductive heating device uses at least 2 inductors (1,2), each supplied with a MF current, the effective sections (7) of the inductor conductor loops extend parallel to one another, with the current flowing in the same direction. The inductors are arranged in opposing pairs, lying on opposite sides of the treated metal goods (3), the currents in their conductor loop sections flowing in opposite directions. Preferably the conductor loop sections of each inductor are located in a single channel in the surface of the inductor core (4,5), or in separate reception grooves, spaced across the surface of each core.

Description

Die Erfindung betrifft eine Vorrichtung zum induktiven Längsfelderwärmen von flachem Metallgut, wie z.B. Bändern, Platten oder dergleichen aus Nichteisenmetall, Stahl oder einem ferromagnetischen Werkstoff, mit mindestens zwei mit Wechselstrom, insbesondere mittelfrequentem Wechselstrom, gespeisten Induktoren, die jeweils mit Leiterschleifen versehen sind, deren wirksame Abschnitte je ein magnetisches Wechselfeld erzeugen.The invention relates to a device for inductive longitudinal field heating of flat metal, such as Strips, plates or the like made of non-ferrous metal, steel or a ferromagnetic material, with at least two inductors fed with alternating current, in particular medium-frequency alternating current, which are each provided with conductor loops, the effective sections of which each generate an alternating magnetic field.

Aus der US-Patentschrift 2 448 011 ist bereits eine Vorrichtung zur Längsfelderwärmung von Stahlbändern bekannt, bei der das zu erwarmende Stahlband durch den Innenraum einer zylindrischen Induktionsspule ("Induktor") geführt wird, welche in dem Metallgut ein magnetisches Wechselfeld erzeugt, dessen Kraftlinien parallel zur Ebene des Metallguts verlaufen ("Längsfeld-Prinzip").A device for longitudinal field heating of steel strips is already known from US Pat. No. 2,448,011, in which the steel strip to be heated is guided through the interior of a cylindrical induction coil ("inductor") which generates an alternating magnetic field in the metal material, the lines of force of which are parallel run to the level of the metal goods ("longitudinal field principle").

Der Hauptvorteil der bekannten Vorrichtung liegt in der hohen Gleichmäßigkeit der Erwärmung über die gesamte Metallgutbreite, wobei sich auch bei unterschiedlichen Breiten des Metallgutes eine gleichmäßige Temperaturverteilung erreichen läßt.The main advantage of the known device lies in the high uniformity of the heating over the entire width of the metal material, it being possible to achieve a uniform temperature distribution even with different widths of the metal material.

Demgegenüber weist diese Vorrichtung aber auch einige Nachteile auf. Zum einen können keine befriedigenden Wirkungsgrade bei der Erwärmung erzielt werden, wenn Metallgut mit unterschiedlichen Breiten und Dicken erwärmt werden soll. Beim Wechsel auf Metallgut anderer Breite und/oder Dicke sind bei der bekannten Vorrichtung Austauschinduktoren erforderlich, um auch bei unterschiedlichen Abmessungen des Metallgutes einen guten elektrischen Wirkungsgrad zu erzielen. Dies ist aber ein sehr umständliches und unwirtschaftliches Verfahren, da hierbei die gesamte Anlage stillgesetzt werden muß und beispielsweise die für den kontinuierlichen Betrieb üblicherweise aneinandergehefteten Metallbänder getrennt und nach dem Einbau des Austauschinduktors wieder verbunden werden müssen. Es entstehen somit erhebliche Produktionsausfälle. Ferner treten bei der bekannten Vorrichtung an der Induktionsspule Streufelder auf, die den elektrischen Wirkungsgrad dieser Erwärmungsvorrichtung weiter herabsetzen.In contrast, this device also has some disadvantages. On the one hand, satisfactory heating efficiencies cannot be achieved if metal goods with different widths and thicknesses are to be heated. When changing to metal goods of different widths and / or thicknesses, replacement inductors are required in the known device in order to achieve good electrical efficiency even with different dimensions of the metal goods. However, this is a very cumbersome and uneconomical process, since the entire system must be shut down and, for example, the metal strips usually attached to one another for continuous operation must be disconnected and reconnected after installing the replacement inductor. This results in significant production downtimes. Furthermore, stray fields occur in the known device on the induction coil, which further reduce the electrical efficiency of this heating device.

Es ist daneben aus der PCT/US 88/00981 bereits ein Induktionsofen zur Verzinkung von Stahlband bekannt, bei dem das flache Metallgut vollständig von Spulenkörpern (=Induktoren) umgeben ist. Allerdings besteht bei dieser Vorrichtung die Möglichkeit, die an einem Rahmen befestigten Induktoren mittels eines Schienensystems von dem kontinuierlichen Metallgut zu entfernen. Damit sind die Induktoren beispielsweise zu Wartungszwecken leicht zugänglich, ohne daß dabei das Metallgut durchtrennt werden muß. Bei dieser Vorrichtung ist allerdings noch keine Anpassung an unterschiedliche Metallgutbreiten vorgesehen.In addition, an induction furnace for galvanizing steel strip is already known from PCT / US 88/00981, in which the flat metal material is completely surrounded by coil formers (= inductors). However, with this device it is possible to remove the inductors attached to a frame from the continuous metal material by means of a rail system. This makes the inductors easily accessible, for example for maintenance purposes, without having to cut through the metal material. In this device, however, no adaptation to different widths of metal is provided.

Des weiteren ist aus der US-Patentschrift 37 25 629 eine Induktionsvorrichtung zur Längsfelderwärmung von metallischem Gut bekannt, bei der einzelne, parallel geschaltete Leiterschleifen das zu erwärmende Gut umgeben. Der durch diese Leiterschleifen gebildete Induktor ist an einer Seite offen, so daß das zu erwärmende Gut seitlich durch diese Öffnung in den Induktor eingeführt werden kann. Hier ist allerdings ebenfalls keine Anpassung an unterschiedliche Metallgutbreiten vorgesehen.Furthermore, an induction device for longitudinal field heating of metallic material is known from US Pat. No. 37 25 629, in which individual conductor loops connected in parallel surround the material to be heated. The inductor formed by these conductor loops is open on one side, so that the material to be heated can be introduced laterally through this opening into the inductor. However, no adaptation to different metal goods widths is provided here either.

Schließlich ist aus der DE 39 28 629 A1 eine Vorrichtung zum induktiven Erwärmen von flachem metallischen Gut bekannt, die mindestens zwei Induktoren aufweist, welche sich an gegenüberliegenden Seiten des Metallgutes jeweils paarweise gegenüberliegen. Diese Vorrichtung erlaubt durch getrennte Schaltung einzelner Leiterschleifen eine Anpassung an unterschiedliche Breiten des metallischen Gutes. Mit dieser Vorrichtung wird jedoch eine Querfelderwärmung durchgeführt, die gegenüber der Längsfelderwärmung eine geringere Gleichmäßigkeit der Erwärmung über die gesamte Metallgutbreite bewirkt.Finally, from DE 39 28 629 A1 a device for inductive heating of flat metallic material is known, which has at least two inductors, which are opposite each other in pairs on opposite sides of the metal material. By means of separate switching of individual conductor loops, this device allows adaptation to different widths of the metallic material. With this device, however, cross-field heating is carried out, which is lower than that of longitudinal field heating Uniformity of heating across the entire width of the metal material.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs erwähnten Art so zu gestalten, daß sie an die jeweilige Metallgutbreite anpaßbar ist und für Reinigungs- und Wartungsarbeiten von außen her gut zugänglich ist, um Produktionsausfälle weitgehend zu vermeiden. Ferner soll erreicht werden, daß sich die Vorrichtung aufgrund ihrer Bauart kostengünstig herstellen läßt.The present invention has for its object to design a device of the type mentioned in such a way that it can be adapted to the respective metal material width and is easily accessible from outside for cleaning and maintenance work in order to largely avoid production downtimes. It should also be achieved that the device can be manufactured inexpensively due to its design.

Diese Aufgabe wird bei einer Vorrichtung der eingangs genannten Art erfindungsgemäß dadurch gelöst, daß die wirksamen Abschnitte der Leiterschleifen jedes Induktors parallel zueinander verlaufen und in gleicher Richtung von Strom durchflossen sind, daß jeweils zwei Induktoren paarweise einander zugeordnet sind derart, daß sie einander gegenüberliegen und auf verschiedenen Seiten des flachen Metallgutes angeordnet sind und daß die wirksamen Abschnitte der Leiterschleifen der beiden Induktoren eines Paares in entgegengesetzten Richtungen von Strom durchflossen sind.This object is achieved according to the invention in a device of the type mentioned at the outset in that the effective sections of the conductor loops of each inductor run parallel to one another and through which current flows in the same direction, that two inductors are assigned to one another in pairs in such a way that they lie opposite one another and on are arranged on different sides of the flat metal material and that the effective sections of the conductor loops of the two inductors of a pair have current flowing through them in opposite directions.

Eine derartige Anordnung der Induktoren erlaubt einerseits eine Anpassung an die jeweilige Metallgutbreite, da in dieser Richtung gesehen keine räumliche Begrenzung der Induktoranordnung besteht. Aufgrund der getrennten Anordnung ist diese Vorrichtung andererseits beispielsweise für Wartungsarbeiten gut zugänglich. Durch die Verwendung eines Eisenkerns wird letztlich eine Leistungssteigerung des Induktors für die Erwärmung erzielt und ebenso aufgrund der hierdurch erreichbaren Bündelung der Kraftlinien gleichzeitig eine sehr kompakte Bauweise möglich.Such an arrangement of the inductors allows, on the one hand, an adaptation to the respective metal material width, since seen in this direction there is no spatial limitation of the inductor arrangement. On the other hand, due to the separate arrangement, this device is easily accessible for maintenance work, for example. By using an iron core, an increase in performance of the inductor for heating is ultimately achieved and, due to the bundling of the force lines that can be achieved thereby, a very compact design is also possible at the same time.

Die wirksamen Abschnitte der Leiterschleifen können dabei einen geradlinigen oder einen von einer Geraden abweichenden Verlauf haben.The effective sections of the conductor loops can have a straight or a course deviating from a straight line.

Die erfindungsgemäße Vorrichtung kann weiter so ausgebildet sein, daß die wirksamen Abschnitte der Leiterschleifen in Nuten der Induktorkerne angeordnet sind. Hierdurch wird zum einen eine noch kompaktere Bauweise des Induktors ermöglicht, zum anderen die Ankopplung der magnetischen Kraftlinien an den Eisenkern verbessert.The device according to the invention can also be designed such that the effective sections of the conductor loops are arranged in grooves in the inductor cores. On the one hand, this enables an even more compact design of the inductor, and on the other hand improves the coupling of the magnetic lines of force to the iron core.

Die erfindungsgemäße Vorrichtung kann ferner so ausgebildet sein, daß die Induktoren und das flache Metallgut relativ zueinander bewegbar sind. Dabei können die Induktoren relativ zu Platten oder dergleichen bewegt werden. Es ist gleichermaßen möglich, die Induktoren statisch anzuordnen und das flache Metallgut in Form eines Bandes oder dergleichen zu bewegen.The device according to the invention can also be designed such that the inductors and the flat metal material can be moved relative to one another. The inductors can be moved relative to plates or the like. It is equally possible to arrange the inductors statically and to move the flat metal material in the form of a band or the like.

Die erfindungsgemäße Vorrichtung kann ferner so ausgebildet sein, daß die wirksamen Abschnitte der Leiterschleifen der Induktoren in Bewegungsrichtung längs, quer oder geneigt dazu verlaufen. Somit können die einzelnen Induktorpaare jeweils in die für das betreffende Gut und dessen Abmessungen optimale Position gebracht werden, um die gewünschte Gleichmäßigkeit der Erwärumung im Metallgut herbeizuführen.The device according to the invention can also be designed such that the effective sections of the conductor loops of the inductors run longitudinally, transversely or at an angle to them in the direction of movement. Thus, the individual pairs of inductors can each be brought into the optimal position for the material in question and its dimensions in order to bring about the desired uniformity of the heating in the metal material.

Die erfindungsgemäße Vorrichtung kann ferner so ausgebildet sein, daß mehrere Induktorpaare nebeneinander angeordnet sind, wobei ihre Induktorkerne miteinander verklemmt oder miteinander einstückig ausgebildet sind. Somit kann der Einwirkungsbereich einer Induktoreinheit den jeweiligen Erfordernissen angepaßt werden. Eine solche Einheit besteht dann aus mehreren Induktorpaaren, wobei die Stromrichtung in den wirksamen Abschnitten der Leiterschleifen benachbarter Induktoren gleich oder entgegengesetzt sein kann. Durch eine solche Art der Anordnung mehrerer nebeneinander plazierter Induktoren kann der elektrische Wirkungsgrad erhöht werden. Bei unterschiedlicher elektrischer Polarität benachbarter Induktoren bilden sich entsprechend der Anzahl der Induktoren mehrere Bereich im Metallgut aus, in denen geschlossene Wirbelströme fließen. Dies führt gegenüber einer einzigen geschlossenen Wirbelstrombahn zu einer erhöhten elektrischen Leistungsdichte in dem Metallgut. Durch Verwendung mehrerer Induktoren nebeneinander ist schließlich auch eine gute Abstimmung auf jeweiligen Metallgutbreiten möglich.The device according to the invention can also be designed such that a plurality of pairs of inductors are arranged next to one another, their inductor cores being clamped to one another or being formed in one piece with one another. The range of action of an inductor unit can thus be adapted to the respective requirements. Such a unit then consists of several pairs of inductors, wherein the current direction in the effective sections of the conductor loops of adjacent inductors can be the same or opposite. The electrical efficiency can be increased by such a type of arrangement of a plurality of inductors placed next to one another. With different electrical polarities of adjacent inductors, several areas are formed in the metal material in accordance with the number of inductors, in which closed eddy currents flow. Compared to a single closed eddy current path, this leads to an increased electrical power density in the metal material. By using several inductors next to each other, a good adjustment to the respective width of the metal is finally possible.

Die erfindungsgemäße Vorrichtung kann so ausgebildet sein, daß Induktorpaare getaktet und zeitversetzt zueinander schaltbar sind. Insbesondere kommen dabei Induktorpaare zum Einsatz, von denen eines nur eine geringe Zahl von Leiterschleifen hat und sich in Rand- oder Zwischenlage zu anderen Induktoren befindet. Auf diese Weise kann der Bildung von unerwünschten Temperaturschatten im Metallgut entgegengewirkt werden.The device according to the invention can be designed such that inductor pairs can be clocked and switched at different times. In particular, inductor pairs are used, one of which has only a small number of conductor loops and which is in the peripheral or intermediate position to other inductors. In this way, the formation of undesirable temperature shadows in the metal can be counteracted.

Die erfindungsgemäße Vorrichtung kann ferner so ausgebildet sein, daß mehrere Induktorkerne in Bewegungsrichtung hintereinander angeordnet sind. Dabei können die wirksamen Abschnitte der Leiterschleifen der in Bewegungsrichtung aufeinander folgenden Induktoren gleiche oder voneinander abweichende Neigungen zur Transportrichtung haben, um auf diese Weise zur Vergleichmäßigung der Erwärmung weiter beizutragen.The device according to the invention can also be designed such that a plurality of inductor cores are arranged one behind the other in the direction of movement. The effective sections of the conductor loops of the successive inductors in the direction of movement can have the same or different inclinations to the direction of transport, in order in this way to further help to even out the heating.

Die erfindungsgemäße Vorrichtung kann ferner so ausgebildet sein, daß den Zwischenbereichen zweier benachbarter Induktoren Trimmkerne zugeordnet sind. Auf diese Weise wird ein Ausgleich von etwaigen Temperaturschatten im Bereich zwischen Induktoren bewirkt.The device according to the invention can also be designed such that trim cores are assigned to the intermediate regions of two adjacent inductors. In this way, any temperature shadows in the area between inductors are compensated for.

Die erfindungsgemäße Vorrichtung kann ferner so ausgebildet sein, daß die wirksamen Abschnitte der Leiterschleifen eines Induktors parallel zueinander geschaltet sind. Auf diese Weise kann die Zahl der Rückführungen reduziert und damit der Bauaufwand gesenkt werden.The device according to the invention can also be designed such that the effective sections of the conductor loops of an inductor are connected in parallel with one another. In this way, the number of returns can be reduced and thus the construction costs can be reduced.

Die erfindungsgemäße Vorrichtung kann ferner so ausgebildet sein, daß die wirksamen Abschnitte der Leiterschleifen eines Induktorpaares in einem gemeinsamen Stromkreis liegen.The device according to the invention can also be designed such that the effective sections of the conductor loops of an inductor pair lie in a common circuit.

Die erfindungsgemäße Vorrichtung kann ferner so ausgebildet, daß die Leiterschleifen zur Rückführung seitlich am jeweiligen Induktorkern geführt sind.The device according to the invention can also be designed such that the conductor loops for feedback are guided laterally on the respective inductor core.

Die erfindungsgemäße Vorrichtung kann ferner so ausgebildet sein, daß die Leiterschleifen wirksame Abschnitte in zwei benachbarten Induktoren bilden.The device according to the invention can also be designed such that the conductor loops form effective sections in two adjacent inductors.

Schließlich kann die erfindungsgemäße Vorrichtung so ausgebildet sein, daß Leiterschleifen mindestens eines Induktors getrennt schaltbar sind. Somit kann die Vorrichtung an die Breite des zu erwärmenden Gutes angepaßt werden, ohne dafür irgendwelche Umbauten zu erfordern.Finally, the device according to the invention can be designed such that conductor loops of at least one inductor can be switched separately. Thus, the device can be adapted to the width of the material to be heated, without requiring any modifications.

Im folgenden Teil der Beschreibung sind einige Ausführungsformen der erfindungsgemäßen Vorrichtung anhand von Zeichnungen beschrieben. Es zeigen:

Fig. 1:
eine Ausführungsform der erfindungsgemäßen Vorrichtung mit zwei Induktoren auf jeder Seite des zu erwärmenden Gutes,
Fig. 2:
eine Draufsicht auf die in Fig. 1 dargestellte Ausführungsform mit zusätzlichem Trimmkern,
Fig. 3:
eine Ausführungsform der erfindungsgemäßen Vorrichtung mit jeweils einem Induktor auf jeder Seite des zu erwärmenden Gutes,
Fig. 4:
eine Ausführungsform der Erfindung, bei der die Leiterschleifen seitlich eines Induktorkerns zurückgeführt sind,
Fig. 5:
eine perspektivische Ansicht einer weiteren Ausführungsform der erfindungsgemäßen Vorrichtung mit zwei übereinander angeordneten Induktoren, wobei die wirksamen Abschnitte der Leiterschleifen parallel zueinander geschaltet sind und
Fig. 6:
eine Draufsicht auf eine weitere Ausführungsform der erfindungsgemäßen Vorrichtung, bei der zwei Induktoren in Bewegungsrichtung des Gutes hintereinander angeordnet sind.
In the following part of the description, some embodiments of the device according to the invention are described with reference to drawings. Show it:
Fig. 1:
one embodiment of the device according to the invention with two inductors on each side of the material to be heated,
Fig. 2:
2 shows a top view of the embodiment shown in FIG. 1 with an additional trim core,
Fig. 3:
one embodiment of the device according to the invention, each with an inductor on each side of the material to be heated,
Fig. 4:
an embodiment of the invention in which the conductor loops are fed back to the side of an inductor core,
Fig. 5:
a perspective view of a further embodiment of the device according to the invention with two inductors arranged one above the other, the effective sections of the conductor loops being connected in parallel with one another and
Fig. 6:
a plan view of a further embodiment of the device according to the invention, in which two inductors are arranged one behind the other in the direction of movement of the material.

Fig.3 zeigt zwei paarweise übereinander angeordnete Induktoren 1, 2, zwischen denen ein flaches Metallgut 3 zum Zwecke der Erwärmung hindurchgeführt werden kann. Die Induktoren 1,2 sind untereinander gleich ausgebildet und haben je einen Eisenkern 4,5. An den einander zugewandten Seiten der Eisenkerne 4,5 ist je eine Aufnahme 6 vorgesehen, in der die wirksamen Abschnitte 7 von hier nicht weiter dargestellten Leiterschleifen parallel zueinander verlaufend angeordnet sind. Alle wirksamen Abschnitte 7 der Leiterschleifen des oberen Induktors 1 sind in gleicher Richtung stromdurchflossen. Dies gilt auch für alle wirksamen Abschnitte 7 des unteren Induktors 2 mit der Ausnahme, daß die Stromrichtung hier umgekehrt ist.3 shows two inductors 1, 2 arranged one above the other in pairs, between which a flat metal material 3 can be passed for the purpose of heating. The inductors 1, 2 are identical to one another and each have an iron core 4, 5. On the mutually facing sides of the iron cores 4, 5, a receptacle 6 is provided, in which the active sections 7 of conductor loops (not shown here) are arranged to run parallel to one another. All active sections 7 of the conductor loops of the upper inductor 1 have current flowing through them in the same direction. This also applies to all effective sections 7 of the lower inductor 2, with the exception that the current direction is reversed here.

Die wirksamen Abschnitte 7, der Leiterschleifen können in den Aufnahmen 6 in geeignetes Material eingebettet sein oder in hier nicht dargestellten Nuten verlaufen.The active sections 7, the conductor loops can be embedded in the receptacles 6 in a suitable material or run in grooves, not shown here.

Sie können dabei gradlinig, wellen- oder zickzackförmig verlaufen.You can run straight, wavy or zigzag.

Die Ausführungsform der erfindungsgemäßen Vorrichtung gemäß Fig. 1 kann als ein Nebeneinander von zwei Induktorpaaren gemäß Fig. 3 verstanden werden. Die Eisenkerne 4,5 sind dabei einstückig für die Induktoren 1,1' bzw. 2,2'. Gemäß Fig. 1 sind alle wirksamen Abschnitte 7 der Leiterschleifen in Nuten 9 der Eisenkerne 4, 5 angeordnet, wobei die Stromrichtung in den wirksamen Abschnitten 7 der Induktoren 1,2' gleich ist. Untereinander gleiche Stromrichtung haben auch die wirksamen Abschnitte 7 in den Induktoren 2,1' mit der Ausnahme, daß hier der Strom in entgegengesetzter Richtung fließt wie in den Induktoren 1,2'.The embodiment of the device according to the invention according to FIG. 1 can be understood as a juxtaposition of two pairs of inductors according to FIG. 3. The iron cores 4,5 are in one piece for the inductors 1,1 'and 2,2'. 1, all effective sections 7 of the conductor loops are arranged in grooves 9 of the iron cores 4, 5, the current direction in the effective sections 7 of the inductors 1, 2 'is the same. The effective sections 7 in the inductors 2, 1 'have the same current direction with one another, with the exception that the current flows here in the opposite direction to that in the inductors 1, 2'.

Die wirksamen Abschnitte 7 in den Induktoren 1',2' haben entgegengesetzte Polarität im Vergleich zu Induktoren 1,2. Es ist aber auch möglich, die Polarität der Induktoren 1',2' gleich derjenigen der Induktoren 1,2 zu wählen und damit jeweils oberhalb und unterhalb des Metallgutes 3 in benachbarten Induktoren gleiche Polarität herbeizuführen.The effective sections 7 in the inductors 1 ', 2' have opposite polarity compared to inductors 1, 2. However, it is also possible to select the polarity of the inductors 1 ', 2' to be the same as that of the inductors 1, 2 and thus to bring about the same polarity above and below the metal material 3 in adjacent inductors.

Der Ausführungsform der Vorrichtung gemäß Fig. 1 kann im Bereich des Übergangs zwischen den Induktoren 1,1' bzw. 2,2' ein Trimmkern 10 nachgeschaltet sein, um hier eventuell auftretende Temperturschatten auszugleichen. Dies ist in Fig. 2 veranschaulicht, in der der Pfeil 11 ebenso wie in Fig. 1 die Bewegungsrichtung des Metallgutes 3 anzeigt.The embodiment of the device according to FIG. 1 can be followed by a trimming core 10 in the region of the transition between the inductors 1, 1 'or 2.2' in order to compensate for temperature shadows that may occur here. This is illustrated in FIG. 2, in which the arrow 11, like in FIG. 1, indicates the direction of movement of the metal material 3.

Fig. 4 ist als Ergänzung zu Fig. 1 zu verstehen, indem sie nicht nur die wirksamen Abschnitte 7 der Leiterschleifen, sondern auch deren Rückführung kenntlich macht. Diese geschieht an den Seiten der Eisenkerne 4,5 in dort vorgesehenen Ausnehmungen 19.FIG. 4 is to be understood as a supplement to FIG. 1 by not only identifying the effective sections 7 of the conductor loops, but also their return. This takes place on the sides of the iron cores 4, 5 in recesses 19 provided there.

Die Ausführungsform nach Fig. 5 zeigt einen oberen Induktor 1 mit einem Eisenkern 4 und einen unteren Induktor 2 mit einem Eisenkern 5. In den Eisenkernen 4,5 sind Nuten 9 vorgesehen, in denen sich wirksame Abschnitte 7 von Leiterschleifen befinden. Dabei sind alle wirksamen Abschnitte 7 des oberen Induktors 1 parallel zueinander in einem Stromkreis geschaltet, in dem auch alle wirksamen Abschnitte 7 parallel zueinander, aber mit entgegengesetzter Polarität geschaltet sind.The embodiment according to FIG. 5 shows an upper inductor 1 with an iron core 4 and a lower inductor 2 with an iron core 5. Grooves 9 are provided in the iron cores 4, 5, in which there are effective sections 7 of conductor loops. In this case, all active sections 7 of the upper inductor 1 are connected in parallel to one another in a circuit in which all active sections 7 are also connected in parallel to one another, but with opposite polarity.

Fig. 6 schließlich zeigt schematisch zwei in Bewegungsrichtung (Pfeil 11) des Metallgutes 3 hintereinander angeordnete Induktoren 1, bei denen die wirksamen Abschnitte der Leiterschleifen um 90° gegeneinander versetzt sind.Fig. 6 finally shows schematically two arranged one behind the other in the direction of movement (arrow 11) of the metal goods 3 Inductors 1, in which the effective sections of the conductor loops are offset from one another by 90 °.

Alle Induktoren sind an eine mittelfrequente Wechselstromquelle angeschlossen.All inductors are connected to a medium frequency AC source.

Claims (13)

Vorrichtung zum induktiven Längsfelderwärmen von flachem Metallgut (3), wie z.B. Bändern, Platten oder dergleichen aus Nichteisenmetall, Stahl oder einem ferromagnetischen Werkstoff, mit mindestens zwei mit Wechselstrom, insbesondere mittelfrequentem Wechselstrom, gespeisten Induktoren (1,2,1',2'), die jeweils mit Leiterschleifen versehen sind, deren wirksame Abschnitte (7) je ein magnetisches Wechselfeld erzeugen,
dadurch gekennzeichnet,
daß die wirksamen Abschnitte (7) der Leiterschleifen jedes Induktors (1,2,1',2') parallel zueinander verlaufen und in gleicher Richtung von Strom durchflossen sind, daß jeweils zwei Induktoren (1,2,1',2') paarweise einander zugeordnet sind derart, daß sie einander gegenüberliegen und auf verschiedenen Seiten des flachen Metallgutes (3) angeordnet sind und
daß die wirksamen Abschnitte (7) der Leiterschleifen der beiden Induktoren (1,2,1',2') eines Paares in entgegengesetzten Richtungen von Strom durchflossen sind.Device for inductive longitudinal field heating of flat metal material (3), such as strips, plates or the like made of non-ferrous metal, steel or a ferromagnetic material, with at least two inductors (1, 2, 1 ', 2') fed with alternating current, in particular medium-frequency alternating current. , which are each provided with conductor loops, the effective sections (7) of which each generate an alternating magnetic field,
characterized,
that the effective sections (7) of the conductor loops of each inductor (1, 2, 1 ', 2') run parallel to one another and through which current flows in the same direction, that two inductors (1, 2, 1 ', 2') each in pairs are assigned to one another in such a way that they lie opposite one another and are arranged on different sides of the flat metal material (3) and
that the effective sections (7) of the conductor loops of the two inductors (1, 2, 1 ', 2') of a pair have current flowing through them in opposite directions. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die wirksamen Abschnitte (7) der Leiterschleifen in Nuten (9;13) der Induktorkerne (4,5,12) angeordnet sind.Device according to claim 1, characterized in that the effective sections (7) of the conductor loops are arranged in grooves (9; 13) of the inductor cores (4,5,12). Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Induktoren (1,2,1',2') und das flache Metallgut (3) relativ zueinander bewegbar sind.Device according to claim 1 or 2, characterized in that the inductors (1, 2, 1 ', 2') and the flat metal material (3) can be moved relative to one another. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die wirksamen Abschnitte (7) der Leiterschleifen der Induktoren (1,2,1',2') in Bewegungsrichtung (11) längs, quer oder geneigt dazu verlaufen.Apparatus according to claim 3, characterized in that the effective sections (7) of the conductor loops of the inductors (1, 2, 1 ', 2') run in the direction of movement (11) longitudinally, transversely or inclined thereto. Vorrichtung nach einem vorhergehenden Ansprüche, dadurch gekennzeichnet, daß mehrere Induktorpaare nebeneinander angeordnet sind, wobei ihre Induktorkerne (4,5,12) miteinander verklemmt oder miteinander einstückig ausgebildet sind.Device according to one of the preceding claims, characterized in that a plurality of pairs of inductors are arranged next to one another, their inductor cores (4, 5, 12) being clamped together or formed in one piece with one another. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß Induktorpaare getaktet und zeitversetzt zueinander schaltbar sind.Device according to one of the preceding claims, characterized in that inductor pairs are clocked and can be switched at different times. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß mehrere Induktorkerne (4,5,12) in Bewegungsrichtung (11) hintereinander angeordnet sind.Device according to one of the preceding claims, characterized in that a plurality of inductor cores (4, 5, 12) are arranged one behind the other in the direction of movement (11). Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß den Zwischenbereichen zweier benachbarter Induktoren (1,2,1',2') Trimmkerne (10) zugeordnet sind.Device according to one of the preceding claims, characterized in that trim cores (10) are assigned to the intermediate areas of two adjacent inductors (1, 2, 1 ', 2'). Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die wirksamen Abschnitte (7) der Leiterschleifen eines Induktors (1,2,1',2') parallel zueinander geschaltet sind.Device according to one of the preceding claims, characterized in that the effective sections (7) of the conductor loops of an inductor (1, 2, 1 ', 2') are connected in parallel to one another. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die wirksamen Abschnitte (7) der Leiterschleifen eines Induktorpaares in einem gemeinsamen Stromkreis liegen.Device according to one of the preceding claims, characterized in that the effective sections (7) the conductor loops of an inductor pair lie in a common circuit. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Leiterschleifen zur Rückführung seitlich am jeweiligen Induktorkern (4,5,12) geführt sind.Device according to one of the preceding claims, characterized in that the conductor loops for the return are guided laterally on the respective inductor core (4, 5, 12). Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Leiterschleifen wirksame Abschnitte (7) in zwei benachbarten Induktoren (1,2,1',2') bilden.Device according to one of the preceding claims, characterized in that the conductor loops form effective sections (7) in two adjacent inductors (1, 2, 1 ', 2'). Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß Leiterschleifen mindestens eines Induktors (1,2,1',2') getrennt schaltbar sind.Device according to one of the preceding claims, characterized in that conductor loops of at least one inductor (1, 2, 1 ', 2') can be switched separately.
EP94111752A 1993-08-02 1994-07-28 Longitudinal field induction heating device for flat metallic pieces Expired - Lifetime EP0637897B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4325868 1993-08-02
DE4325868A DE4325868C2 (en) 1993-08-02 1993-08-02 Device for inductive longitudinal field heating of flat metal

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EP0637897A2 true EP0637897A2 (en) 1995-02-08
EP0637897A3 EP0637897A3 (en) 1995-09-20
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EP (1) EP0637897B1 (en)
JP (1) JPH07153560A (en)
AT (1) ATE189097T1 (en)
DE (2) DE4325868C2 (en)
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Cited By (2)

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EP0763962A2 (en) * 1995-09-08 1997-03-19 Inductotherm Corp. Induction heating coil assembly for prevention of circulating currents in induction heating lines for continuous-cast products
EP0965685A3 (en) * 1998-06-20 2001-03-14 ABG Allgemeine Baumaschinen-Gesellschaft mbH Tamping beam for a road finisher

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KR100998962B1 (en) * 2003-07-21 2010-12-09 매그나칩 반도체 유한회사 Method for manufacturing inductor incorporating thereinto core portion
JP2008226780A (en) * 2007-03-15 2008-09-25 Mitsui Eng & Shipbuild Co Ltd Induction heating device
KR102196842B1 (en) 2016-03-30 2020-12-30 닛폰세이테츠 가부시키가이샤 Induction heating device and induction heating method

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US3725629A (en) * 1971-07-16 1973-04-03 Park O Ind Inc Slab heating device
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EP0763962A2 (en) * 1995-09-08 1997-03-19 Inductotherm Corp. Induction heating coil assembly for prevention of circulating currents in induction heating lines for continuous-cast products
EP0763962A3 (en) * 1995-09-08 1997-04-09 Inductotherm Corp
EP0965685A3 (en) * 1998-06-20 2001-03-14 ABG Allgemeine Baumaschinen-Gesellschaft mbH Tamping beam for a road finisher

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ES2144020T3 (en) 2000-06-01
EP0637897A3 (en) 1995-09-20
ATE189097T1 (en) 2000-02-15
DE4325868C1 (en) 1995-01-12
DE59409084D1 (en) 2000-02-24
DE4325868C2 (en) 1997-11-13
EP0637897B1 (en) 2000-01-19
DK0637897T3 (en) 2000-07-10
JPH07153560A (en) 1995-06-16

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