US3766353A - Apparatus for the induction heating of metal sheets and process for heating such metal sheets - Google Patents

Apparatus for the induction heating of metal sheets and process for heating such metal sheets Download PDF

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Publication number
US3766353A
US3766353A US00217188A US3766353DA US3766353A US 3766353 A US3766353 A US 3766353A US 00217188 A US00217188 A US 00217188A US 3766353D A US3766353D A US 3766353DA US 3766353 A US3766353 A US 3766353A
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United States
Prior art keywords
guideway
inductor
metal sheets
arms
main portion
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Expired - Lifetime
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US00217188A
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English (en)
Inventor
Andre Barbieux
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Elphiac SA
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Elphiac SA
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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
    • H05B6/362—Coil arrangements with flat coil conductors

Definitions

  • ABSTRACT An apparatus for the induction heating of metal sheets.
  • the apparatus comprises generally an alternating current generator, an inductor connected to the generator, and a guideway for the metal sheets to be heated passing through the inductor in a direction such that the lines of force of the magnetic field are parallel to the guideway and to themselves inside the guideway.
  • the inductor is made in the form of a curved loop having two arms and surrounding the guideway.
  • the loop consists of at least one main portion in which the area located between the two arms is crossed by the guideway and at least two secondary portions which are parallel to the lateral edges of the guideway and run along such lateral edges at a predetermined distance therefrom.
  • the process for carrying out the heating of the metal sheets consists in passing the sheets inside the guideway through the inductor.
  • This invention relates to an apparatus for the induction heating of metal sheets which permits to reach a temperature which is perfectly uniform across the whole-section of the metal sheets and to a process for carrying out heating of the metal sheets.
  • the invention permits to prevent the overheating of the lateral edges of the metal sheets and to obtain a heating at a temperature perfectly uniform across the whole section of the metal sheets. It is characterized in that the inductor consists of a curved loop surrounding a guideway for the metal sheets and composed of at least one main portion in which the area located between the two arms of the loop is crossed by the guideway and of two secondary portions placed on each side of the main portion which extend in a direction parallel to the lateral edges of the guideway and at a predetermined distance from such lateral edges, When the inductor comprises two main portions, the loop may be bent in a rectangular shape and if the number of the main portions is higher, the loop is bent in a zigzag form.
  • the invention also concerns a process for heating metal sheets.
  • Such process is characterized in that the metal sheets are passed through the guideway and thus through one or plural inductors as disclosed above and in that the distance between the lateral edges of the metal sheets and the secondary portions of the inductor is adjusted at a predetermined value.
  • FIG. 1 illustrates a perspective view of a schematic embodiment of an apparatus in accordance with the invention
  • FIG. 2 illustrates a plan view of another schematic embodiment of an apparatus in accordance with the invention
  • FIG. 3 illustrates a perspective view of another schematic embodiment of the invention.
  • FIG. 4 illustrates a perspective view, partially in cross-section of an apparatus permitting to realize the schematic embodiment of FIG. 3.
  • an alternating current generator 1 feeds an inductor having two arms 2, 2', 2" and 3, 3', 3" having the form of a curved loop similar to a hair pin.
  • Such inductor is composed of a main portion 2, 3 and of two secondary portions 2', 3', and 2", 3".
  • the area located between the two arms 2, 3 of the main portion is crossed by a guideway 4 for the sheet metals to be heated.
  • the secondary portions extend parallel to the lateral edges of the guideway 4 at a predetermined distance therefrom.
  • the generator 1 also feeds an inductor having two arms but only one of the arms is visible because FIG. 2 is a plan view.
  • Such inductor also has the shape of a curved loop, but instead of being bent in the shape of a C, such as the inductor of FIG. 1, the inductor according to FIG. 2 is bent in a zigzag form made of portions 5 to 13.
  • the portions 6, 8, 10 and 12 are the main portions which cross the guideway 4 whereas the portions 5, 7, 9, l1 and 13 are the secondary portions which run along the lateral edges of the guideway 4.
  • FIG. 3 illustrates schematically an inductor made of an upper arm 15 to 23 and of a lower arm 24 to 32.
  • Such inductor comprises two main portions composed of parts 16, 17, 18 and 29, 30, 31 on the one hand and of parts 20, 21, 22 and 25, 26, 27 on the other hand.
  • the inductor also comprises three secondary portions formed by the parts 15, 32; 19, 28 and 23, 24 of the arms.
  • the main portions are each madeof a central part 17, 30 and 21, 26 and of two end parts 16, 31 18, 29; 27, 33 and 22, 25.
  • the central parts of the main portions are placed facing the central part of the guideway 4 of the metal sheets.
  • the end parts of the main portions are located facing the lateral edges of the guideway 4.
  • the parts of the upper and lower arms forming the end parts of the main portions are located at a distance which is relatively large with respect to each other. Such distance is lower for the parts of the arms forming the central parts of the main portions and still lower for the parts of the arms forming the secondary portions.
  • This arrangement produces the following effects; the stray field of the secondary portions is located in a space closely surrounding the secondary portions.
  • the inductive coupling is very loose at the location of the lateral edges of the metal sheets to be heated and is much stronger at the location of the centra part of the metal sheets.
  • the current flows from the secondary portions of the inductor to the end parts of the main portions and vice versa by means of inclined parts 33 of the arms of the inductor and from the end parts to the central parts of the main portions of the inductor and vice versa by means of inclined parts 34.
  • inclined parts 33 of the arms of the inductor and from the end parts to the central parts of the main portions of the inductor and vice versa by means of inclined parts 34.
  • the width of the main portions is narrowed down at the end parts thereof by means of cutout parts 35.
  • FIG. 4 illustrates a portion of a practical embodiment of the inductor shown in FIG. 3.
  • FIG. 4 illustrates the end parts 18, 29 of FIG. 3.
  • a frame made of copper sheet 36 is placed facing another frame of copper sheet 37.
  • Each of the frames 36 and 37 is cooled by means of a water conduit 38.
  • To the frame 36 is secured a copper flat plate 39 and a copper flat plate 46.
  • To the frame 37 is secured a copper flat plate 41 and a copper flat plate 42.
  • the two flat plates 40 and 42 are separated by a thin insulator 43 and are thicker than flat plates 39 and 41.
  • the flat plates 39 and 41 are placed facing the central part of the guideway 4.
  • the lower surface of flat plate 39 corresponds to the portion 17 of FIG. 3.
  • the guideway for the metal sheets is illustrated as being located in a plane. It is obvious that the metal sheets could also move themselves in a curved guideway and that, in' this case, the frames 36 and 37 would follow the curvature of such guideway.
  • the heating apparatus may comprise not only an alternating current generator but plural generators feeding each an inductor in accordance with the invention. The frequency of the alternating current ischosen in function of the desired depth of penetration of the currents induced in the metal sheets. For thin metal sheets, such frequency is thus chosen 'in the radio frequencies.
  • the metalsheets may be moved either in a continuous way if the full surface of the metal sheets is to be heated,'or step by step if certain portions of the metal sheets only are to be heated.
  • the sheet is passed in a continuous way through one or plural inductors such as disclosed above.
  • the temperature of the metal sheet is measured at the output of the inductors. Such temperature is compared with a reference temperature and the strength of the current and/or the speed of movement of thesheet is controlled to reduce to zero the difference between the measured tempera ture and thevreference temperature.
  • Apparatus for the induction heating of metal sheets comprising an alternating current generator, an inductor connected to said generator, a guideway for a metal sheet to be heatedpassing through said inductor in a direction such that the lines of force of the magnetic field are parallel to the guideway and to themselves inside said guideway, characterized in that the inductor comprises a curved loop having two arms and surrounding said guideway, said loop consisting of at least one main portion in which the area located between said two arms is crossed by the guideway; at least two secondary portions which are parallel to the lateral edges of said guideway and run along said lateral edges at a predetermined distance therefrom; one said secondary portion being adjacent to each extremity of each said main portion; and the main portion of the inductor consisting of flat strips of metal of which the flat strip sides face the guideway, each said flat strip having a median part shorter than the breadth of the guideway disposed close to the guideway and end parts bent to a greater distance from the guideway and connected to said secondary portions.
  • Apparatus for the induction heating of metal sheets comprising an alternating current generator, an inductor connected to said generator, a guideway for a metal sheet to be heated passing through said inductor in a direction such that thelines of force of the magnetic field are parallel to the guideway and to themselves inside said guideway, characterized in that the inductor comprises a curved loop having two arms and surrounding said guideway, said loop consisting of at least one main portion in which the area'located between said two arms is crossed by the guidewaytat' least two secondary portions which are parallel to' the lateral edges of said guideway and run along said lateral edges at a predetermined distance therefrom; one said secondary portion being adjacent to each extremity of each said main portion; and the main portion of the inductor consisting of flat strips of metal of which the flat sides face the guideway, said flat strips being disposed in parallel planes and having metalbars shorter than the breadth of the guideway fixed on a median part of each strip on the sides of the strips facing the guideway, the extremities of said flap strips

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)
US00217188A 1971-01-15 1972-01-12 Apparatus for the induction heating of metal sheets and process for heating such metal sheets Expired - Lifetime US3766353A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE761612A BE761612A (fr) 1971-01-15 1971-01-15 Dispositif de chauffage par induction de toles et procede de chauffage de toles.

Publications (1)

Publication Number Publication Date
US3766353A true US3766353A (en) 1973-10-16

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US00217188A Expired - Lifetime US3766353A (en) 1971-01-15 1972-01-12 Apparatus for the induction heating of metal sheets and process for heating such metal sheets

Country Status (9)

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US (1) US3766353A (de)
JP (1) JPS5234564B1 (de)
BE (1) BE761612A (de)
CH (1) CH559496A5 (de)
DE (1) DE2200473C3 (de)
FR (1) FR2121611B1 (de)
GB (1) GB1372318A (de)
IT (1) IT948204B (de)
SE (1) SE369733B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093349A2 (de) * 1982-04-30 1983-11-09 Hitachi, Ltd. Verfahren zum Heizen eines Rohrteils und Heizwendel
US4740663A (en) * 1987-01-02 1988-04-26 Continental Can Company, Inc. Transverse flux induction heating unit
US4751360A (en) * 1987-06-26 1988-06-14 Ross Nicholas V Apparatus for the continuous induction heating of metallic strip
US4757175A (en) * 1987-01-02 1988-07-12 Continental Can Company, Inc. Induction heating coil
US4788396A (en) * 1986-12-11 1988-11-29 Centre National de la Recherche Scientifique G.I.S. Madylam Method of sintering by induction
US4853510A (en) * 1987-01-02 1989-08-01 Continental Can Company, Inc. Induction heating coil
US5495094A (en) * 1994-04-08 1996-02-27 Inductotherm Corp. Continuous strip material induction heating coil
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
US6365883B1 (en) * 1998-09-11 2002-04-02 Robotron Corporation U-shaped adhesive bonding apparatus
FR3130109A1 (fr) * 2021-12-07 2023-06-09 Fives Celes Element d’un equipement de chauffage par induction apte a recevoir un fluide de refroidissement

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6340733U (de) * 1986-09-02 1988-03-16
US6576878B2 (en) * 2001-01-03 2003-06-10 Inductotherm Corp. Transverse flux induction heating apparatus
KR20080094963A (ko) * 2006-02-22 2008-10-27 인덕터썸코포레이션 횡자속 전기 인덕터

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3058840A (en) * 1959-04-16 1962-10-16 Electric Furnace Co Induction strip heating apparatus
US3301991A (en) * 1963-06-07 1967-01-31 Deutsche Edelstahlwerke Ag Inductor for heating the ends of elongated stock
US3444346A (en) * 1966-12-19 1969-05-13 Texas Instruments Inc Inductive heating of strip material
US3531612A (en) * 1965-08-31 1970-09-29 Acec Means for heating by induction

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2528810A (en) * 1945-07-21 1950-11-07 Chain Belt Co Induction heating and welding
FR1395170A (fr) * 1964-04-27 1965-04-09 Detusche Edelstahlwerke Ag Inducteur pour chauffer les extrémités de pièces allongées
FR1393009A (fr) * 1964-05-05 1965-03-19 Deutsche Edelstahlwerke Ag Inducteur
DE1214812B (de) * 1965-06-25 1966-04-21 Siemens Ag Verfahren und Vorrichtung zur induktiven Erwaermung von Werkstuecken mit verstellbaren Induktoren
FR1497057A (fr) * 1966-10-19 1967-10-06 Appareil et procédé de chauffage par induction
FR1541924A (fr) * 1967-10-26 1968-10-11 Ajax Magnethermic Corp Perfectionnements dans le chauffage par induction

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3058840A (en) * 1959-04-16 1962-10-16 Electric Furnace Co Induction strip heating apparatus
US3301991A (en) * 1963-06-07 1967-01-31 Deutsche Edelstahlwerke Ag Inductor for heating the ends of elongated stock
US3531612A (en) * 1965-08-31 1970-09-29 Acec Means for heating by induction
US3444346A (en) * 1966-12-19 1969-05-13 Texas Instruments Inc Inductive heating of strip material

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0093349A2 (de) * 1982-04-30 1983-11-09 Hitachi, Ltd. Verfahren zum Heizen eines Rohrteils und Heizwendel
EP0093349A3 (en) * 1982-04-30 1984-07-18 Hitachi, Ltd. Method of heating piping arrangement and heating coil
US4788396A (en) * 1986-12-11 1988-11-29 Centre National de la Recherche Scientifique G.I.S. Madylam Method of sintering by induction
US4740663A (en) * 1987-01-02 1988-04-26 Continental Can Company, Inc. Transverse flux induction heating unit
US4757175A (en) * 1987-01-02 1988-07-12 Continental Can Company, Inc. Induction heating coil
US4853510A (en) * 1987-01-02 1989-08-01 Continental Can Company, Inc. Induction heating coil
US4751360A (en) * 1987-06-26 1988-06-14 Ross Nicholas V Apparatus for the continuous induction heating of metallic strip
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
US5495094A (en) * 1994-04-08 1996-02-27 Inductotherm Corp. Continuous strip material induction heating coil
US6365883B1 (en) * 1998-09-11 2002-04-02 Robotron Corporation U-shaped adhesive bonding apparatus
FR3130109A1 (fr) * 2021-12-07 2023-06-09 Fives Celes Element d’un equipement de chauffage par induction apte a recevoir un fluide de refroidissement
WO2023104911A1 (fr) * 2021-12-07 2023-06-15 Fives Celes Element d'un equipement de chauffage par induction apte a recevoir un fluide de refroidissement

Also Published As

Publication number Publication date
BE761612A (fr) 1971-07-15
CH559496A5 (fr) 1975-02-28
FR2121611B1 (fr) 1977-04-01
SE369733B (sv) 1974-09-16
FR2121611A1 (fr) 1972-08-25
DE2200473B2 (de) 1974-07-04
DE2200473A1 (de) 1972-08-24
IT948204B (it) 1973-05-30
GB1372318A (en) 1974-10-30
JPS5234564B1 (en) 1977-09-03
DE2200473C3 (de) 1975-02-20

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