US2897328A - Method of progressively heating sheet metal and an induction coil for performing the method - Google Patents

Method of progressively heating sheet metal and an induction coil for performing the method Download PDF

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Publication number
US2897328A
US2897328A US721916A US72191658A US2897328A US 2897328 A US2897328 A US 2897328A US 721916 A US721916 A US 721916A US 72191658 A US72191658 A US 72191658A US 2897328 A US2897328 A US 2897328A
Authority
US
United States
Prior art keywords
strip
induction coil
sheet metal
heating sheet
sheet
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
US721916A
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English (en)
Inventor
Alf Fritz
Seul Vincenz
Lenze Josef
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.)
Deutsche Edelstahlwerke AG
AEG AG
Original Assignee
Deutsche Edelstahlwerke AG
AEG AG
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 Deutsche Edelstahlwerke AG, AEG AG filed Critical Deutsche Edelstahlwerke AG
Application granted granted Critical
Publication of US2897328A publication Critical patent/US2897328A/en
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
    • H05B6/36—Coil arrangements

Definitions

  • the invention relates to a method of progressively heating ferritic sheet, more particularly in the form of strip, by induction.
  • the inductiveheating of sheet and strip is known to call for the observance of special conditions when thin sheet or strip is being heated, and more particularly if it is only 0.5 mm. or less, say 0.10 to 0.35 mm., thick.
  • the heating of sheet and strip may be necessary for various reasons. It is a treatment of outstanding importance in the production of tinned sheet or strip.
  • strip . (which term shall hereinafter and in the claims'ihereofbe understood to include sheet) has been galvanically tinned, the tin must be flowed on the strip.
  • the temperatures required for this purpose are under 500 C., more particularly between 200 and 300 C.
  • the power density should be less than 10 watts/sq. cm. and that the frequency should be 10,000 cycles per second.
  • the efficiencies that can then be achieved are, outstanding. This is due to the fact that the reduction in power density brings about a concomitant increase in permeability improving the susceptibility of the sheet above that of the surrounding air to such an extent that despite an indifferent coupling factor the greater part of the magnetic field emanating from the coil will be drawn into the strip.
  • the resultant electric coupling factor becomes more favourable, the efiiciency improves, and a favourable power factor ensues. Even in the case of strip only 0.15 mm. thick at good heating efficiency can be achieved even with a frequency of only 5000 cycles per second.
  • the method according to the invention especially if it is performed with the help of an inductor of the kind herein proposed and described permits ferritic sheet and strip to be satisfactorily heated in continuous progression with low installed power by the application of frequencies between 5000 and 10,000 cycles per second, to the temperatures required for flowing a previously applied coating of tin. Temperatures of 200 to 300 can be readily produced even if the velocity of travel is as high as metres per minute and even more.
  • Method of progressively inductively heating ferritic strip of a thickness not less than 0.10 mm. or more than 0.35 mm. to a temperature not less than 200 C. or more than 300 C. by means of at least one induction coil embracing the strip and operating with current at medium frequency, and at a power density of not exceeding 20 watts/ sq. cm.
  • An induction coil for carrying out the method according to claim 1, comprising conductor sections arranged to cross the sheet or strip at right angles in relation to its edges and having connecting portions to extend around the edges of the sheet or strip from one side to the other of the latter at an angle of pitch not less than 25.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
US721916A 1957-03-23 1958-03-17 Method of progressively heating sheet metal and an induction coil for performing the method Expired - Lifetime US2897328A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED25240A DE1044303B (de) 1957-03-23 1957-03-23 Verfahren zum fortschreitenden Erwaermen von ferritischen Blechen und Induktionsspule zur Ausuebung des Verfahrens

Publications (1)

Publication Number Publication Date
US2897328A true US2897328A (en) 1959-07-28

Family

ID=7038468

Family Applications (1)

Application Number Title Priority Date Filing Date
US721916A Expired - Lifetime US2897328A (en) 1957-03-23 1958-03-17 Method of progressively heating sheet metal and an induction coil for performing the method

Country Status (4)

Country Link
US (1) US2897328A (ro)
BE (1) BE565971A (ro)
DE (1) DE1044303B (ro)
GB (1) GB855847A (ro)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3008025A (en) * 1958-08-09 1961-11-07 Deutsche Edelstahlwerke Ag Method of progressively induction heating metal strip and an apparatus for performing the same
US3031555A (en) * 1959-07-15 1962-04-24 Magnethermic Corp Induction heating
US3041434A (en) * 1958-09-19 1962-06-26 Deutsche Edelstahlwerke Ag Method of and apparatus for inductively heating metal
US3125655A (en) * 1964-03-17 Inductions heating coil
US3313907A (en) * 1963-09-06 1967-04-11 Deutsche Edelstahlwerke Ag Apparatus for inductively heating metal strip
US3329591A (en) * 1963-09-21 1967-07-04 Muller Hans-Heinz Method and apparatus for heating metal strip
US3384732A (en) * 1964-01-08 1968-05-21 Taylor Winfield Corp Induction annealing of strip joints
US3833207A (en) * 1971-07-22 1974-09-03 Gen Electric Apparatus for alloy microstructure control
US5175406A (en) * 1990-10-25 1992-12-29 Centre Technique Industriel Dit: Institut Textile De France Resonant high-frequency or micro-wave applicator for thermal treatment of continuously moving flat material
WO2006088067A1 (en) * 2005-02-18 2006-08-24 Nippon Steel Corporation Induction heating device for a metal plate
US20090127254A1 (en) * 2007-11-16 2009-05-21 Mtu Aero Engines Gmbh Induction coil, method and device for inductive heating of metallic components
EP2157193A1 (en) * 2007-04-16 2010-02-24 Nippon Steel Corporation Metal plate induction heating device and induction heating method
US20100155390A1 (en) * 2005-02-18 2010-06-24 Yoshiaki Hirota 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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1135586B (de) * 1959-06-02 1962-08-30 Glyco Metall Werke Verfahren und Vorrichtung zum Gluehen von Stahlband, das mit einem Material, insbesondere einer Metallegierung plattiert ist

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2408190A (en) * 1944-01-27 1946-09-24 Westinghouse Electric Corp Magnetic induction heating of thinwalled nonmagnetic metallic tubes
US2448011A (en) * 1944-09-09 1948-08-31 Westinghouse Electric Corp Method and apparatus for induction heating of metal strips

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1646498A (en) * 1925-12-29 1927-10-25 Gen Electric Electric heating
US2005901A (en) * 1932-07-29 1935-06-25 Westinghouse Electric & Mfg Co Induction sheet heater
DE767369C (de) * 1941-06-17 1952-06-19 Deutsche Edelstahlwerke Ag Elektrische Spule oder Leiterschleife zum induktiven Erhitzen von Werkstuecken

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2408190A (en) * 1944-01-27 1946-09-24 Westinghouse Electric Corp Magnetic induction heating of thinwalled nonmagnetic metallic tubes
US2448011A (en) * 1944-09-09 1948-08-31 Westinghouse Electric Corp Method and apparatus for induction heating of metal strips

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125655A (en) * 1964-03-17 Inductions heating coil
US3008025A (en) * 1958-08-09 1961-11-07 Deutsche Edelstahlwerke Ag Method of progressively induction heating metal strip and an apparatus for performing the same
US3041434A (en) * 1958-09-19 1962-06-26 Deutsche Edelstahlwerke Ag Method of and apparatus for inductively heating metal
US3031555A (en) * 1959-07-15 1962-04-24 Magnethermic Corp Induction heating
US3313907A (en) * 1963-09-06 1967-04-11 Deutsche Edelstahlwerke Ag Apparatus for inductively heating metal strip
US3329591A (en) * 1963-09-21 1967-07-04 Muller Hans-Heinz Method and apparatus for heating metal strip
US3384732A (en) * 1964-01-08 1968-05-21 Taylor Winfield Corp Induction annealing of strip joints
US3833207A (en) * 1971-07-22 1974-09-03 Gen Electric Apparatus for alloy microstructure control
US5175406A (en) * 1990-10-25 1992-12-29 Centre Technique Industriel Dit: Institut Textile De France Resonant high-frequency or micro-wave applicator for thermal treatment of continuously moving flat material
WO2006088067A1 (en) * 2005-02-18 2006-08-24 Nippon Steel Corporation Induction heating device for a metal plate
US20080264932A1 (en) * 2005-02-18 2008-10-30 Nippon Steel Corporation , Induction Heating Device for a Metal Plate
KR100899252B1 (ko) * 2005-02-18 2009-05-27 신닛뽄세이테쯔 카부시키카이샤 금속판용 유도 가열장치
US20100155390A1 (en) * 2005-02-18 2010-06-24 Yoshiaki Hirota 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
US8536498B2 (en) 2005-02-18 2013-09-17 Nippon Steel & Sumitomo Metal Corporation Induction heating device for a metal plate
US9888529B2 (en) 2005-02-18 2018-02-06 Nippon Steel & Sumitomo Metal Corporation Induction heating device for a metal plate
EP2157193A1 (en) * 2007-04-16 2010-02-24 Nippon Steel Corporation Metal plate induction heating device and induction heating method
EP2157193A4 (en) * 2007-04-16 2013-07-31 Nippon Steel & Sumitomo Metal Corp DEVICE FOR INDUCTION HEATING OF A METAL PLATE AND INDUCTION HEATING METHOD
US20090127254A1 (en) * 2007-11-16 2009-05-21 Mtu Aero Engines Gmbh Induction coil, method and device for inductive heating of metallic components

Also Published As

Publication number Publication date
GB855847A (en) 1960-12-07
BE565971A (ro)
DE1044303B (de) 1958-11-20

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