EP0637897A2 - Dispositif pour le chauffage inductif par champ longitudinal de pièces métalliques planes - Google Patents

Dispositif pour le chauffage inductif par champ longitudinal de pièces métalliques planes 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
Authority
EP
European Patent Office
Prior art keywords
inductors
inductor
conductor loops
another
effective sections
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94111752A
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German (de)
English (en)
Other versions
EP0637897B1 (fr
EP0637897A3 (fr
Inventor
Dieter Dipl.-Ing. Schluckebier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Otto Junker GmbH
Original Assignee
Otto Junker GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Otto Junker GmbH filed Critical Otto Junker GmbH
Publication of EP0637897A2 publication Critical patent/EP0637897A2/fr
Publication of EP0637897A3 publication Critical patent/EP0637897A3/fr
Application granted granted Critical
Publication of EP0637897B1 publication Critical patent/EP0637897B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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)
EP94111752A 1993-08-02 1994-07-28 Dispositif pour le chauffage inductif par champ longitudinal de pièces métalliques planes Expired - Lifetime EP0637897B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4325868 1993-08-02
DE4325868A DE4325868C2 (de) 1993-08-02 1993-08-02 Vorrichtung zum induktiven Längsfelderwärmen von flachem Metallgut

Publications (3)

Publication Number Publication Date
EP0637897A2 true EP0637897A2 (fr) 1995-02-08
EP0637897A3 EP0637897A3 (fr) 1995-09-20
EP0637897B1 EP0637897B1 (fr) 2000-01-19

Family

ID=6494253

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94111752A Expired - Lifetime EP0637897B1 (fr) 1993-08-02 1994-07-28 Dispositif pour le chauffage inductif par champ longitudinal de pièces métalliques planes

Country Status (6)

Country Link
EP (1) EP0637897B1 (fr)
JP (1) JPH07153560A (fr)
AT (1) ATE189097T1 (fr)
DE (2) DE4325868C2 (fr)
DK (1) DK0637897T3 (fr)
ES (1) ES2144020T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0763962A2 (fr) * 1995-09-08 1997-03-19 Inductotherm Corp. Bobine de chauffage par induction pour la prévention des courants circulants dans des chaînes de chauffage par induction pour des produits fabriqués de coulée continu
EP0965685A3 (fr) * 1998-06-20 2001-03-14 ABG Allgemeine Baumaschinen-Gesellschaft mbH Poutre dameuse pour finisseuse

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100998962B1 (ko) * 2003-07-21 2010-12-09 매그나칩 반도체 유한회사 코어부를 삽입한 인덕터 제조방법
JP2008226780A (ja) * 2007-03-15 2008-09-25 Mitsui Eng & Shipbuild Co Ltd 誘導加熱装置
JP6665928B2 (ja) 2016-03-30 2020-03-13 日本製鉄株式会社 誘導加熱装置および誘導加熱方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE501964A (fr) *
US2902572A (en) * 1957-03-05 1959-09-01 Penn Induction Company Induction heating of metal strip
US3725629A (en) * 1971-07-16 1973-04-03 Park O Ind Inc Slab heating device
US3731040A (en) * 1971-09-24 1973-05-01 Park Ohio Industries Inc Billet heating coil
GB2262420A (en) * 1991-12-03 1993-06-16 Electricity Ass Tech Induction heating apparatus

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448011A (en) * 1944-09-09 1948-08-31 Westinghouse Electric Corp Method and apparatus for induction heating of metal strips
CA1320900C (fr) * 1986-08-06 1993-08-03 Jerome B. Zeldis Dosage pour determiner la presence d'un virus vivant in vitro
US4761530A (en) * 1987-04-03 1988-08-02 National Steel Corporation Electric induction heat treating furnace
DE3928629A1 (de) * 1989-08-30 1991-03-14 Junker Gmbh O Vorrichtung zum induktiven erwaermen von flachem metallischem gut

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE501964A (fr) *
US2902572A (en) * 1957-03-05 1959-09-01 Penn Induction Company Induction heating of metal strip
US3725629A (en) * 1971-07-16 1973-04-03 Park O Ind Inc Slab heating device
US3731040A (en) * 1971-09-24 1973-05-01 Park Ohio Industries Inc Billet heating coil
GB2262420A (en) * 1991-12-03 1993-06-16 Electricity Ass Tech Induction heating apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5844213A (en) * 1990-01-31 1998-12-01 Inductotherm Corp. Induction heating coil assembly for prevention of circulating currents in induction heating lines for continuous-cast products
EP0763962A2 (fr) * 1995-09-08 1997-03-19 Inductotherm Corp. Bobine de chauffage par induction pour la prévention des courants circulants dans des chaînes de chauffage par induction pour des produits fabriqués de coulée continu
EP0763962A3 (fr) * 1995-09-08 1997-04-09 Inductotherm Corp
EP0965685A3 (fr) * 1998-06-20 2001-03-14 ABG Allgemeine Baumaschinen-Gesellschaft mbH Poutre dameuse pour finisseuse

Also Published As

Publication number Publication date
DE59409084D1 (de) 2000-02-24
DE4325868C1 (de) 1995-01-12
ES2144020T3 (es) 2000-06-01
DE4325868C2 (de) 1997-11-13
ATE189097T1 (de) 2000-02-15
DK0637897T3 (da) 2000-07-10
EP0637897B1 (fr) 2000-01-19
EP0637897A3 (fr) 1995-09-20
JPH07153560A (ja) 1995-06-16

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