EP0489772B1 - Vorrichtung zum induktiven erwärmen von flachem metallischem gut - Google Patents

Vorrichtung zum induktiven erwärmen von flachem metallischem gut Download PDF

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Publication number
EP0489772B1
EP0489772B1 EP90912636A EP90912636A EP0489772B1 EP 0489772 B1 EP0489772 B1 EP 0489772B1 EP 90912636 A EP90912636 A EP 90912636A EP 90912636 A EP90912636 A EP 90912636A EP 0489772 B1 EP0489772 B1 EP 0489772B1
Authority
EP
European Patent Office
Prior art keywords
inductor
current
accordance
current conductors
inductors
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.)
Expired - Lifetime
Application number
EP90912636A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0489772A1 (de
Inventor
Dieter 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 EP0489772A1 publication Critical patent/EP0489772A1/de
Application granted granted Critical
Publication of EP0489772B1 publication Critical patent/EP0489772B1/de
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

Definitions

  • the invention relates to a device for inductive heating of flat metallic material, e.g. Bands and plates, with at least one pair of inductors, which forms an intermediate space for the passage of the goods and whose inductors have an iron core formed from transformer sheets, which has grooves in which, in some cases, switchable current conductors are arranged.
  • flat metallic material e.g. Bands and plates
  • inductors which forms an intermediate space for the passage of the goods and whose inductors have an iron core formed from transformer sheets, which has grooves in which, in some cases, switchable current conductors are arranged.
  • Each inductor consists of an iron core with a series of recessed grooves in which the current conductors of the inductor are embedded. These conductors run transversely to or in the transport direction of the goods. The uniformity of the heating across the width of the goods always causes problems with these inductive heating devices, in particular when the device is to work with goods of different widths.
  • EP-PS 0 150 793 In order to get closer to the goal of uniform heating of flat metallic material of different widths, it is proposed in EP-PS 0 150 793 to divide the inductor into several inductor sections arranged next to one another, which extend in the longitudinal direction and each have their own inductor winding and their own magnetic circuit.
  • the spacing of the inductor sections from one another can be changed or adapted in accordance with the respective width of the goods.
  • An adaptation to the crop width can be achieved by switching the outer inductor sections on and off.
  • With this known device are adjustments of the heating energy to different crop widths possible.
  • the construction of the device is very complex due to the numerous inductor sections arranged separately from one another.
  • the approximately rectangular coils create large pole widths, which are disadvantageous for the temperature distribution.
  • an inductive heating device is described in DE-PS 884 811, which has two or more meandering curved inductive heating conductors arranged one behind the other in the feed direction and offset one or more times.
  • a major disadvantage of this known device is that, although uniform heating may be achieved for a certain good width to be heated, satisfactory uniform heating can then no longer be achieved with different good widths.
  • the object of the present invention is to design a device of the type mentioned at the outset in such a way that the disadvantages of the known relevant devices are avoided and that even with different crop widths over the respective width, a uniform heating pattern is achieved with a simple construction of the inductors.
  • the iron cores of at least one inductor run in a zigzag or undulating manner in the transport direction of the goods Have grooves, the inclination of which is a maximum of 60 ° with respect to the transport direction and into which the current conductors are inserted following the course of the groove, and that the inductors of at least one pair of inductors have a plurality of current conductors arranged next to one another and flowing through in the same direction.
  • the zigzag or wavy current conductor in the correspondingly arranged grooves of the iron core ensures that the duration of action of a current conductor on the section of the material to be heated covered by it is uniform, so that uniform heating occurs in this section.
  • the zigzag or wave-shaped course offers particularly advantageous options for arranging adjacent current conductors in a particularly uniform distribution. In this case, spikes or waves of current conductors designed in this way can intervene in corresponding free spaces of adjacent conductors and, in contrast, be offset. Such a uniform arrangement cannot be used, in particular, in the case of such known current conductors which are composed of conductor sections which run essentially at right angles to one another.
  • the device according to the invention can also be designed such that the current conductors through which current flows in the same direction each have a conductor part running in the transport direction of the material and a conductor part running counter to this transport direction.
  • the device according to the invention can also be designed such that the current conductors which are arranged next to one another in the same direction through which the current flows are arranged symmetrically to the longitudinal axis of the inductor. This will in particular an adaptation to different crop widths facilitated.
  • the device according to the invention can also be designed such that there is at least one current conductor in each groove of an iron core.
  • each inductor has two mechanically separated inductor parts which are arranged one behind the other and have grooves for receiving current conductors.
  • each inductor has two mechanically separated inductor parts which are arranged one behind the other and have grooves for receiving current conductors.
  • the device according to the invention can also be designed such that the two inductor parts can be displaced relative to one another essentially transversely to the transport direction. This also makes the influence of the current conductors and thus the heating of the goods more uniform.
  • the device according to the invention can also be designed such that the pole width of the inductors can be changed.
  • the device according to the invention can also be designed such that the current conductor located on a good edge or a plurality of current conductors located on the good edge is or are electrically short-circuited with the current conductor that follows next to the transport direction.
  • a damper winding that promotes equalization is built up here.
  • the device according to the invention can also be designed such that when using a plurality of pairs of inductors, each pair of inductors is connected to a separate current source, each with a different frequency.
  • the use of different, adapted frequencies can also promote uniform heating across the crop width.
  • the device according to the invention can also be designed such that the current conductor (s) located at the edge of the crop is or are connected to a current source with a different frequency than the current conductors located in the middle product zone. In this way too, the equalization can be further promoted.
  • the device according to the invention can also be designed such that the longitudinal center line of at least one inductor is inclined by 3 ° to 6 ° against the transport direction.
  • the device according to the invention can also be designed such that the iron core and current conductor of an inductor are pivoted through 180 ° relative to the iron core and current conductors of the other inductor of a pair of inductors.
  • the device according to the invention can be designed such that the iron cores of a pair of inductors are arranged offset from one another.
  • the embodiment of the device for inductive heating according to the invention shown in FIGS. 1 and 2 has four inductors 1,2,3,4.
  • the inductors 1 and 2 form a pair of inductors and the inductors 3 and 4 form a further pair of inductors.
  • the inductors of a pair of inductors lie on opposite sides of a strip-like material 4 'which is guided through a gap 5 in the pairs of inductors.
  • the inductors 1, 2, 3, 4 are each in two inductor parts 6, 7; 8.9; 10.11; 12, 13 divided.
  • Each inductor part 8.9 has an iron core 14.15.
  • These iron cores 14, 15 are provided with a series of zigzag grooves 17 - 23 and 25 - 31 extending in the transport direction of the goods 4 'shown by the arrow 16.
  • Current conductors 32-38 and 40-46 are arranged in these grooves in accordance with the course of the groove. The formation of the current conductors 32-38 and 40-46 and their arrangement in the grooves 17-23 and 25-31 is carried out in the usual way.
  • the current conductors are usually equipped with an inner cooling channel, not shown, for the flow of a cooling medium.
  • the space between the groove and the current conductor is filled with a suitable casting compound, on the one hand to create a good hold for the current conductor in the groove and on the other hand to ensure good heat transfer between the current conductor and the iron core and thus to ensure intensive cooling of the iron core.
  • the inductor parts 8, 9 are offset from one another transversely to the transport direction 16 and can be displaced relative to one another in this direction by known mechanical means in order to change the offset.
  • the current conductors are then designed to be flexible in the area between the inductor parts 8, 9.
  • the inclination of the grooves 17-23 and 25-31 and thus also the inclination of the current conductors 32-38 and 40-46 with respect to the transport direction 16 is approximately 15 °.
  • the inductor 4 with the inductor parts 12, 13 is laterally offset with respect to the inductor 2 with the inductor parts 8.9 in order to achieve a uniform, optimal temperature distribution in the material 4.
  • the inductor 4 can also be provided with grooves and conductor loops running transversely to the transport direction 16.
  • Each current conductor or conductor loop consists of two conductor parts inserted into a groove in the iron core. These conductor parts are electrically connected to one another at one inductor end via cross connections, while at the other inductor end they can each be connected via switching means to a predetermined phase of a power network RS.
  • the three middle current conductors 51 and 52, 53 and 54 as well as 55 and 56 can be connected to the power network via switches 61, 62 to be operated together.
  • the other current conductors 47 and 60, 48 and 59, 49 and 58 as well as 50 and 57 can be connected independently of one another via switches 63 to 66 to the power network RS.
  • the inductor has the active current conductors 64 and 78, 66 and 76, 69 and 73 and 70 and 72, which are connected via switches 79, 79 '; 80.80 '; 81.81 '; 82.82 'and 83.83' can be connected in pairs and independently of each other to the power supply RS from the other conductors.
  • the current conductors 65, 68, 71, 74 and 77 are not used in this case. They are kept in reserve for other types of switching.
  • the described device in its various embodiments, enables flat metallic material of different widths to be heated uniformly over the entire material width by the zigzag or wave-shaped course of the current conductors in conjunction with the separate switchability of the individual conductor loops.
  • the outer current conductors can be switched on or off in order to achieve the greatest possible temperature uniformity in the heating material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
EP90912636A 1989-08-30 1990-08-27 Vorrichtung zum induktiven erwärmen von flachem metallischem gut Expired - Lifetime EP0489772B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3928629A DE3928629A1 (de) 1989-08-30 1989-08-30 Vorrichtung zum induktiven erwaermen von flachem metallischem gut
DE3928629 1989-08-30
PCT/DE1990/000654 WO1991003916A1 (de) 1989-08-30 1990-08-27 Vorrichtung zum induktiven erwärmen von flachem metallischem gut

Publications (2)

Publication Number Publication Date
EP0489772A1 EP0489772A1 (de) 1992-06-17
EP0489772B1 true EP0489772B1 (de) 1994-08-03

Family

ID=6388155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90912636A Expired - Lifetime EP0489772B1 (de) 1989-08-30 1990-08-27 Vorrichtung zum induktiven erwärmen von flachem metallischem gut

Country Status (8)

Country Link
US (1) US5336868A (ja)
EP (1) EP0489772B1 (ja)
JP (1) JPH081829B2 (ja)
AT (1) ATE109609T1 (ja)
DE (2) DE3928629A1 (ja)
DK (1) DK0489772T3 (ja)
ES (1) ES2060194T3 (ja)
WO (1) WO1991003916A1 (ja)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5847370A (en) * 1990-06-04 1998-12-08 Nordson Corporation Can coating and curing system having focused induction heater using thin lamination cores
CA2049379A1 (en) * 1990-11-30 1992-05-31 Masatomi Inokuma Electromagnetic induction heater capable of realizing a wide variety of heating rates
GB2262420B (en) * 1991-12-03 1995-02-08 Electricity Ass Tech Induction heating apparatus
DE4240700C2 (de) * 1992-12-03 2003-11-06 Carl Kramer Vorrichtung zum schwebend Führen einer bewegten Warenbahn
DE4325868C2 (de) * 1993-08-02 1997-11-13 Junker Gmbh O Vorrichtung zum induktiven Längsfelderwärmen von flachem Metallgut
EP0765591B1 (de) * 1994-06-15 1998-11-25 Otto Junker GmbH Vorrichtung zur induktiven querfelderwärmung von flachem metallischem gut
AU3386497A (en) * 1996-06-06 1998-01-05 Fleetwood Systems Inc. Liner compound curing apparatus with rf induction heating
US5739506A (en) * 1996-08-20 1998-04-14 Ajax Magnethermic Corporation Coil position adjustment system in induction heating assembly for metal strip
DE10013061C2 (de) * 2000-03-19 2003-10-30 Univ Hannover Querfeld-Erwärmungsanlage
EP1314339B1 (de) * 2000-08-29 2004-10-27 Otto Junker GmbH Vorrichtung zur induktiven erwärmung von metallischen bändern
DE10312623B4 (de) 2003-03-19 2005-03-24 Universität Hannover Querfeld-Erwärmungsanlage
JP4786365B2 (ja) * 2005-02-18 2011-10-05 新日本製鐵株式会社 金属板の誘導加熱装置及び誘導加熱方法
TWI326713B (en) * 2005-02-18 2010-07-01 Nippon Steel Corp Induction heating device for heating a traveling metal plate
US9888529B2 (en) * 2005-02-18 2018-02-06 Nippon Steel & Sumitomo Metal Corporation Induction heating device for a metal plate
CN101120617B (zh) * 2005-02-18 2011-01-19 新日本制铁株式会社 用于金属板的感应加热装置
BR112017027680B1 (pt) 2015-06-24 2022-01-25 Novelis Inc Sistema e método para tratamento de metal
DE102019218391A1 (de) * 2019-11-27 2021-05-27 Thyssenkrupp Ag Induktor zum Vorschub-Randschichthärten
EP3941157A1 (de) 2020-07-15 2022-01-19 ABP Induction Systems GmbH Verfahren und anlage zum induktiven erwärmen von flachgut

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE767369C (de) * 1941-06-17 1952-06-19 Deutsche Edelstahlwerke Ag Elektrische Spule oder Leiterschleife zum induktiven Erhitzen von Werkstuecken
DE884811C (de) * 1942-10-25 1953-07-30 Deutsche Edelstahlwerke Ag Elektroinduktive Heizvorrichtung zum fortschreitenden Oberflaechenhaerten metallischer Werkstuecke
GB593195A (en) * 1944-02-05 1947-10-10 Westinghouse Electric Int Co Improvements in or relating to heating of strip metal, and the like by electromagnetic induction
US2722589A (en) * 1950-11-30 1955-11-01 Ohio Crankshaft Co Method and apparatus for uniformly heating intermittently moving metallic material
US2754397A (en) * 1953-05-22 1956-07-10 Allis Chalmers Mfg Co Multiple plate work coil with offset edges for induction heating
DE1224345B (de) * 1962-01-11 1966-09-08 Aeg Induktor fuer das Oberflaechenerwaermen von Zahnraedern
DE1158194B (de) * 1962-06-22 1963-11-28 Zd Y Elektrotepelnych Zarizeni Induktoranordnung zur induktiven Erwaermung von durchlaufenden Metallbaendern
US3424886A (en) * 1966-10-27 1969-01-28 Ajax Magnethermic Corp Induction heating
US3444346A (en) * 1966-12-19 1969-05-13 Texas Instruments Inc Inductive heating of strip material
US4195214A (en) * 1976-06-28 1980-03-25 The Continental Group, Inc. Apparatus for induction heating of metal plates with holes
US4313433A (en) * 1979-10-09 1982-02-02 Cramer Products, Inc. Ankle stabilizer
JPS6321118Y2 (ja) * 1981-03-17 1988-06-10
FR2558941B1 (fr) * 1984-01-26 1986-05-02 Cem Comp Electro Mec Dispositif de chauffage de produits plats au defile par induction electromagnetique
JPS60255930A (ja) * 1984-05-31 1985-12-17 Dai Ichi High Frequency Co Ltd 枝付管の溶接部における残留応力改善のための加熱方法及び加熱装置
FR2573947B1 (fr) * 1984-11-29 1987-01-02 Cem Comp Electro Mec Dispositif de chauffage de produits plats au defile par induction electromagnetique selon un maillage carre
GB8505811D0 (en) * 1985-03-06 1985-04-11 Bekaert Sa Nv Induction heating
US4778971A (en) * 1986-05-23 1988-10-18 Kabushiki Kaisha Meidensha Induction heating apparatus
GB8721663D0 (en) * 1987-09-15 1987-10-21 Electricity Council Induction heating apparatus
US5025122A (en) * 1989-11-03 1991-06-18 Ajax Magnethermic Corporation Induction heater with axially-aligned coils

Also Published As

Publication number Publication date
ATE109609T1 (de) 1994-08-15
DE3928629C2 (ja) 1992-01-09
ES2060194T3 (es) 1994-11-16
DE59006721D1 (de) 1994-09-08
JPH04507324A (ja) 1992-12-17
DK0489772T3 (da) 1994-12-05
WO1991003916A1 (de) 1991-03-21
DE3928629A1 (de) 1991-03-14
JPH081829B2 (ja) 1996-01-10
US5336868A (en) 1994-08-09
EP0489772A1 (de) 1992-06-17

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