EP0150793A2 - Kontinuierlich arbeitende elektromagnetische Induktionsheizanlage für flache Erzeugnisse - Google Patents

Kontinuierlich arbeitende elektromagnetische Induktionsheizanlage für flache Erzeugnisse Download PDF

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Publication number
EP0150793A2
EP0150793A2 EP85100589A EP85100589A EP0150793A2 EP 0150793 A2 EP0150793 A2 EP 0150793A2 EP 85100589 A EP85100589 A EP 85100589A EP 85100589 A EP85100589 A EP 85100589A EP 0150793 A2 EP0150793 A2 EP 0150793A2
Authority
EP
European Patent Office
Prior art keywords
product
transverse
heating
pitch
inductor
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
EP85100589A
Other languages
English (en)
French (fr)
Other versions
EP0150793B1 (de
EP0150793A3 (en
Inventor
Bernard Chaussé
Jean Delassus
Claude Léon
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.)
Alstom SA
Original Assignee
Compagnie Electro Mecanique SA
Alstom SA
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 Compagnie Electro Mecanique SA, Alstom SA filed Critical Compagnie Electro Mecanique SA
Publication of EP0150793A2 publication Critical patent/EP0150793A2/de
Publication of EP0150793A3 publication Critical patent/EP0150793A3/fr
Application granted granted Critical
Publication of EP0150793B1 publication Critical patent/EP0150793B1/de
Expired legal-status Critical Current

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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
    • H05B6/44—Coil arrangements having more than one coil or coil segment

Definitions

  • the invention applies to the frequent case where the heating must be uniform over the entire surface of the product.
  • edge corrections are obtained by various devices (additional magnetic coils or bridges, air gap modifications, etc.) which complicate the production and must be adapted to the armature reaction of the product, this reaction depending on the characteristics of the latter. : thickness, resistivity.
  • square mesh Another known device known as "square mesh” overcomes previous difficulties. It is described in document FR-A-2 538 665 (French patent n ° EN 82 21906 of December 28, 1982).
  • the inductor constituted by the windings and the magnetic circuits realizes a square mesh of the heating flux with a sinusoidal distribution of the magnetic field in two directions parallel to the sides of the squares. If the product has a width containing an integer number of times the pitch of the mesh, the heating is then homogeneous without any correction of edges. But, if the width of the product does not contain an integer number of times the step of the mesh, a temperature heterogeneity appears on the two edges.
  • the device according to the invention comprises the essential elements previously mentioned.
  • Its inductor has a periodic constitution both in the longitudinal direction with a longitudinal pitch, and in the transverse direction with a transverse pitch, so that the variations in the amplitude of the heating flux in the heating plane draw a rectangular mesh constituted by a juxtaposition of rectangular tiles of lengths equal to this longitudinal step and widths equal to this transverse step.
  • the magnetic circuit comprises in each of these tiles at least one central pole piece such that the amplitude of the heating flow is canceled out on the sides of the tile so that the average heating obtained after the product to be heated is the same in all tile widths fully included in the width of this product.
  • the form of this part is also chosen so that this amplitude is maximum in the center of the pane with a distribution substantially in the form of a sinusoid arch as well according to the longitudinal sections as according to the cross sections.
  • the ratio of the transverse pitch to the longitudinal pitch is chosen to cancel the local heterogeneity of heating in each of the tiles which are entirely contained in the width of the product to be heated. This local heterogeneity is the difference in one direction or the other of the temperature of the middle of the width of the tile compared to that of the edges of the tile after the scrolling of this product.
  • the object of the invention is to allow homogeneous heating of a product of any width without special edge correction and using an acceptable manufacturing cost device.
  • the device according to the present invention is characterized in that it comprises first and second said inductors successively longitudinally, and having respectively a first and a second value different from the longitudinal pitch, and consequently a first and a second value d balance of the transverse step.
  • Each of these inductors is constituted by the juxtaposition of several inductor sections successively transversely in a regular manner according to said transverse pitch, each of these sections extending longitudinally by having its own inductor winding and its own magnetic circuit and by presenting said periodicity according to said longitudinal pitch.
  • Mechanical adjustment means control the spacing between said inductor sections and consequently said transverse pitch at the same value in these two inductors. This makes it possible to adapt the device to limited variations in the width of the product to be heated thanks to a variation of this spacing making this width equal to an integer number of transverse steps. We can then make the edges of this product coincide with the edges of two so-called tiles in each inductor, so as to heat the edge areas of this product to the same temperature as its intermediate areas.
  • the common transverse pitch is controllable between said first and second equilibrium values of the transverse pitch.
  • Electrical adjustment means control the ratio of electrical currents supplied to the two inductors.
  • these adjustment means provide the two inductors with electrical intensities capable of canceling out the local heterogeneity of global heating of the device by compensation for the two heterogeneities specific to the two inductors.
  • the device in order to remain within acceptable costs, a configuration varying only in width is adopted according to the invention, so as to always have an integer number of transverse steps in this width, the device then comprising two inductors whose two longitudinal steps define, with the previous common transverse step, two rectangular meshes.
  • the long side of the rectangle is in the direction of transfer for one of the inductors and in the direction perpendicular to the transfer for the other inductor. It is then possible, by adjusting the ratio of the excitation intensities in the two inductors, to obtain an exact compensation for the heterogeneities created by one inductor by heterogeneities equal in magnitude and opposite in sign and created by the other inductor.
  • each of said sections comprises at least one longitudinal bar carrying said parts polar successively longitudinally projecting towards the product to be heated.
  • a winding specific to this bar follows a wavy path passing longitudinally to the right of a first pole piece, then transversely between this piece and a second, then longitudinally to the left of this second, then transversely between this second and a third, and so right now. This allows an easy realization of the inductor edge.
  • the device also comprises electrical switches to allow the excitation windings of the lateral sections of the two inductors to be connected or disconnected and thus to vary the number of transverse steps to adapt the width of the flow of heating to variations in the width of the product to be heated greater than said limited variations.
  • each section has two said bars arranged on either side of the product to be heated.
  • the present invention also relates to a method of heating flat products by electromagnetic induction on parade, according to which the product to be heated is passed longitudinally in the flow of an inductor having a double periodicity in a longitudinal step and in a step transverse, characterized by the fact that this product is passed through the flow of two successive inductors having a common transverse pitch which is adjustable substantially between the two longitudinal pitches of these two inductors, this transverse pitch is adjusted to make the width of this product with an integer number of transverse steps and thus obtain the same heating on the two edge zones of this product as on the intermediate zones, and we regulate on the one hand the ratio of the intensities supplying these two inductors to homogenize the heating in each transverse step, and on the other hand the total power to reach the desired temperature.
  • the heterogeneity of heating in a transverse step has a sinusoidal distribution whose amplitude DT is given substantially by the expression: if T denotes the average temperature obtained, has the short side and b the long side of the rectangle.
  • a is arranged in the direction of the DX transfer and b according to the width of the product, the maxima of the sinusoid or overheating are in the axis of the rectangles and the minima or underheating on the edges of the rectangles as shown in figure 4.
  • the basic configuration comprises two ovens with respectively two inductors IL and IC, one of which forms a longitudinal pitch mesh PL and the other a longitudinal pitch mesh PC. These two steps are fixed by construction.
  • the mesh In the transverse direction DY, that is to say in the width of the product, the mesh has a variable pitch PT.
  • the product width is n.PC.
  • One of the ovens then has a square mesh, leading to heating free of heterogeneity. It is therefore asked for full power while the second oven is not in use.
  • the product width is n.PL.
  • the oven not used in the previous case becomes square mesh and it is now asked for full power, free of heterogeneity, while the other oven is not used.
  • width of the product is less than n.PC, k longitudinal sections of the previous mesh are disconnected in the width of the product, k being determined by the smallest foreseeable width of products to be heated, this by opening switches such as I1, I2 (see figure 14).
  • the windings Ei, Ei + 1 shown in FIG. 8 belong to two successive sections of rank i and i + 1. Their shape is linked to this inseparability.
  • the electrical conductor takes the form of a ripple around the alternating N and S poles of the same row determining three of the four sides CA, CB and CC of a rectangular turn.
  • This same figure shows that the fourth side CE, of the turn is constituted by a conductor of the neighboring section, due to the directions of currents indicated, without preventing the relative displacement of the first section relative to the second to vary the pitch transverse.
  • the two ovens are produced one with a longitudinal pitch of 170 mm according to FIG. 9, the other with a longitudinal pitch of 240 mm according to FIG. 10.
  • Each longitudinal row of the mesh is materialized by a section of inductor with a magnetic circuit in the form of a bar.
  • the pole pieces are shown in P.
  • the longitudinally extreme pole pieces PE have a length of half.
  • each bar consists of a bed of magnetic sheets 1, clamped between cheeks 2 and braced by parts 3 and 4, as shown in Figure 11.
  • the winding associated with a bar is shown in Figure 12.
  • the conductor consists of two copper tubes 5, 25 mm outside diameter, and 19 mm inside diameter connected in parallel and describing around the poles the ripple previously explained.
  • Figure 13 is a cross section of a bar and shows in addition insulating wedges both electrical 6a and thermal 6b.
  • Figure 14 shows the principle q of electrical connection of one of the inductors.
  • the minimum width of 850 mm is covered by five transverse steps of 170 mm.
  • two additional slices are excited outside the product, one on each edge. These seven sections, each forming a row of poles, are supplied through an Io switch which is only open when the inductor is not in service.
  • the five active steps make it possible to heat all the widths between 850 and 1020 mm.
  • heating widths that can range from 1700 to 1870 mm by changing 12 transverse steps, including 10 active from 170 to 187 mm.
  • This second device has the advantage of making it possible to heat wider widths than the first.
  • the first device not using for large widths the full variation of the transverse pitch, leads for these large widths to better distribute the total power between the two ovens and to minimize the power installation, without using an additional row.
  • This example does not limit the method of electrical connection. It is essentially illustrative. In practice, it is advisable to call in certain cases on paralleling.
  • the supply voltages are chosen to obtain the same intensity in all the windings of the same inductor.
  • Said intensity adjustment means RE are incorporated in the source SE.
  • the system for transferring the product to be heated 7 comprises rollers R1, R2, R3, ensuring horizontal scrolling, the support of the product inside the ovens being provided either by the mechanical tension applied between the inlet and the outlet, or, if the product is not ferromagnetic by the magnetic levitation inseparable from the process (see for example the document FR-A-2 509 562). In the latter case, the rollers R1 'R 2 and R 3 can be omitted, which is advantageous if the product must not be subjected to contact during its treatment.
  • Each oven has two inductors symmetrical with respect to the plane of the product to be heated. The inductors with long pitch are represented in IL and the L, those with short pitch in IC and I'C. Adjustable lateral guides G1, G2 ensure the transverse positioning of the product.
  • FIG. 16 represents the solution adopted in the embodiment to obtain the variation of the transverse pitch. It is the cross section of one of the two ovens and represents only a half width, the other being practically symmetrical.
  • the oven is represented in the configuration corresponding to the minimum value of the transverse pitch.
  • the inductor bars BC1 to BC13 and B'C1 to B'C13, designed as described above and subject of Figures 9 to 13, are carried by mobile supports 21a to 27a, 21b to 27b, except that the bars 10a and 10b identical to others are carried by fixed supports 20a and 20b.
  • the supports 21a to 27b are mobile and driven by rotation of two screws 31a and 31b, guided radially by guides 20a and 20b, the thread pitches being 2 mm for the supports 22a and 22b, as well as 21a and 21b, 4 mm for supports 23a and 23b, 6 mm for supports 24a and 24b, 8 mm for supports 25a and 25b, 10 mm for supports 26a and 26b and 12 mm for supports 27a and 27b. Guides not shown ensure the parallelism of the supports.
  • the configuration is practically symmetrical with respect to the fixed supports 20a and 20b, except that the part not shown has 5 pairs of movable bars (including 21a and 21b) instead of 6.
  • the two screws 31a and 31b are controlled by the same member comprising, on the same shaft 41, two bevel gears 51a and 51b and an operating wheel 61.
  • the product to be heated 7 circulates between the bars 11a to 17a and 11b to 17b perpendicular to the plane of the figure.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)
EP85100589A 1984-01-26 1985-01-22 Kontinuierlich arbeitende elektromagnetische Induktionsheizanlage für flache Erzeugnisse Expired EP0150793B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8401187A FR2558941B1 (fr) 1984-01-26 1984-01-26 Dispositif de chauffage de produits plats au defile par induction electromagnetique
FR8401187 1984-01-26

Publications (3)

Publication Number Publication Date
EP0150793A2 true EP0150793A2 (de) 1985-08-07
EP0150793A3 EP0150793A3 (en) 1985-09-25
EP0150793B1 EP0150793B1 (de) 1989-01-04

Family

ID=9300494

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85100589A Expired EP0150793B1 (de) 1984-01-26 1985-01-22 Kontinuierlich arbeitende elektromagnetische Induktionsheizanlage für flache Erzeugnisse

Country Status (5)

Country Link
US (1) US4587392A (de)
EP (1) EP0150793B1 (de)
JP (1) JPS60172195A (de)
DE (1) DE3567349D1 (de)
FR (1) FR2558941B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0308182A1 (de) * 1987-09-15 1989-03-22 Electricity Association Services Limited Induktionsheizgerät
WO1991003916A1 (de) * 1989-08-30 1991-03-21 Otto Junker Gmbh Vorrichtung zum induktiven erwärmen von flachem metallischem gut
FR2663491A1 (fr) * 1990-06-13 1991-12-20 Siderurgie Fse Inst Rech Inducteur pour le rechauffage localise de produits metallurgiques.
WO2012072770A1 (de) * 2010-12-02 2012-06-07 Zenergy Power Gmbh Verfahren und induktionsheizer zum erwärmen eines billets

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE452085B (sv) * 1986-03-03 1987-11-09 Asea Ab Anordning for vermning av emnen, band eller plat
US4751360A (en) * 1987-06-26 1988-06-14 Ross Nicholas V Apparatus for the continuous induction heating of metallic strip
JPH07101633B2 (ja) * 1987-09-28 1995-11-01 株式会社明電舎 平板の誘導加熱装置
FR2661849B1 (fr) * 1990-05-10 1995-03-17 Siderurgie Fse Inst Rech Procede et dispositifs de rechauffage par induction au defile d'un produit metallurgique de forme allongee.
JP2540041Y2 (ja) * 1993-02-08 1997-07-02 富士電子工業株式会社 円柱状ワークの内周面高周波加熱コイル
JP3310920B2 (ja) * 1998-01-26 2002-08-05 三菱重工業株式会社 シートバー接合機
FR2808163B1 (fr) * 2000-04-19 2002-11-08 Celes Dispositif de chauffage par induction a flux transverse a circuit magnetique de largeur variable
US6677561B1 (en) * 2002-10-21 2004-01-13 Outokumpu Oyj Coil for induction heating of a strip or another elongate metal workpiece
US20100038358A1 (en) * 2008-03-20 2010-02-18 Dingle Brad M Inductive soldering device
DE102009026236A1 (de) * 2009-07-23 2011-04-07 Atn Automatisierungstechnik Niemeier Gmbh Verfahren zum stoffschlüssigen Verbinden von Fügepartnern
EP2838123B1 (de) * 2013-08-14 2016-03-16 Komax Holding AG Löteinrichtung zum Verbinden von Solarzellen

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448012A (en) * 1944-09-09 1948-08-31 Westinghouse Electric Corp Induced heating of continuously moving metal strip with pulsating magnetic flux
DE884811C (de) * 1942-10-25 1953-07-30 Deutsche Edelstahlwerke Ag Elektroinduktive Heizvorrichtung zum fortschreitenden Oberflaechenhaerten metallischer Werkstuecke
GB712066A (en) * 1951-02-03 1954-07-14 Asea Ab High-frequency electromagnetic induction means for heating metallic strips
FR1202900A (fr) * 1957-03-05 1960-01-14 Penn Induction Corp Procédé et appareil pour le chauffage par induction de bandes de tôle
DE1158194B (de) * 1962-06-22 1963-11-28 Zd Y Elektrotepelnych Zarizeni Induktoranordnung zur induktiven Erwaermung von durchlaufenden Metallbaendern
FR1347484A (fr) * 1963-02-13 1963-12-27 Bbc Brown Boveri & Cie Dispositif pour échauffer par induction uniformément et au défilement des bandes métalliques
US3444346A (en) * 1966-12-19 1969-05-13 Texas Instruments Inc Inductive heating of strip material
EP0087345A1 (de) * 1982-02-18 1983-08-31 Alsthom Verfahren und Vorrichtungen zum Verkleinern der induzierten Leistung in einem platten leitenden elektromagnetisch ohne Berührung aufgehängten Produkt
FR2527885A1 (fr) * 1982-05-28 1983-12-02 Glaverbel Procede et dispositif pour la fabrication de panneaux vitreux
FR2538665A1 (fr) * 1982-12-28 1984-06-29 Cem Comp Electro Mec Procede et dispositifs de chauffage homogene par induction de produits plats au defile

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH568661A5 (de) * 1973-09-24 1975-10-31 Varta Batterie
US4321444A (en) * 1975-03-04 1982-03-23 Davies Evan J Induction heating apparatus
FR2509562A1 (fr) * 1981-07-10 1983-01-14 Cem Comp Electro Mec Procede et dispositif de chauffage homogene par induction electromagnetique a flux transversal de produits plats, conducteurs et amagnetiques

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE884811C (de) * 1942-10-25 1953-07-30 Deutsche Edelstahlwerke Ag Elektroinduktive Heizvorrichtung zum fortschreitenden Oberflaechenhaerten metallischer Werkstuecke
US2448012A (en) * 1944-09-09 1948-08-31 Westinghouse Electric Corp Induced heating of continuously moving metal strip with pulsating magnetic flux
GB712066A (en) * 1951-02-03 1954-07-14 Asea Ab High-frequency electromagnetic induction means for heating metallic strips
FR1202900A (fr) * 1957-03-05 1960-01-14 Penn Induction Corp Procédé et appareil pour le chauffage par induction de bandes de tôle
DE1158194B (de) * 1962-06-22 1963-11-28 Zd Y Elektrotepelnych Zarizeni Induktoranordnung zur induktiven Erwaermung von durchlaufenden Metallbaendern
FR1347484A (fr) * 1963-02-13 1963-12-27 Bbc Brown Boveri & Cie Dispositif pour échauffer par induction uniformément et au défilement des bandes métalliques
US3444346A (en) * 1966-12-19 1969-05-13 Texas Instruments Inc Inductive heating of strip material
EP0087345A1 (de) * 1982-02-18 1983-08-31 Alsthom Verfahren und Vorrichtungen zum Verkleinern der induzierten Leistung in einem platten leitenden elektromagnetisch ohne Berührung aufgehängten Produkt
FR2527885A1 (fr) * 1982-05-28 1983-12-02 Glaverbel Procede et dispositif pour la fabrication de panneaux vitreux
FR2538665A1 (fr) * 1982-12-28 1984-06-29 Cem Comp Electro Mec Procede et dispositifs de chauffage homogene par induction de produits plats au defile

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0308182A1 (de) * 1987-09-15 1989-03-22 Electricity Association Services Limited Induktionsheizgerät
WO1991003916A1 (de) * 1989-08-30 1991-03-21 Otto Junker Gmbh Vorrichtung zum induktiven erwärmen von flachem metallischem gut
US5336868A (en) * 1989-08-30 1994-08-09 Otto Junker Gmbh Device for inductively heating flat metal materials
FR2663491A1 (fr) * 1990-06-13 1991-12-20 Siderurgie Fse Inst Rech Inducteur pour le rechauffage localise de produits metallurgiques.
WO2012072770A1 (de) * 2010-12-02 2012-06-07 Zenergy Power Gmbh Verfahren und induktionsheizer zum erwärmen eines billets

Also Published As

Publication number Publication date
FR2558941A1 (fr) 1985-08-02
EP0150793B1 (de) 1989-01-04
DE3567349D1 (en) 1989-02-09
JPS60172195A (ja) 1985-09-05
JPS6310541B2 (de) 1988-03-08
FR2558941B1 (fr) 1986-05-02
US4587392A (en) 1986-05-06
EP0150793A3 (en) 1985-09-25

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