US3663782A - Laminated iron core induction corner-heating unit - Google Patents

Laminated iron core induction corner-heating unit Download PDF

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Publication number
US3663782A
US3663782A US151667A US3663782DA US3663782A US 3663782 A US3663782 A US 3663782A US 151667 A US151667 A US 151667A US 3663782D A US3663782D A US 3663782DA US 3663782 A US3663782 A US 3663782A
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United States
Prior art keywords
laminations
workpiece
heating unit
combination
unit
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Expired - Lifetime
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US151667A
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English (en)
Inventor
William A Emerson
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United States Steel Corp
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United States Steel Corp
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Publication date
Application filed by United States Steel Corp filed Critical United States Steel Corp
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating strands
    • 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
    • H05B6/365—Coil arrangements using supplementary conductive or ferromagnetic pieces

Definitions

  • ABSTRACT Us Cl 219/10 43 219/1061 219/1069
  • the unit has a core [51] Int Cl liOSb 5/00 formed of iron laminations, and preferably has occasional Field 69 l O 79 copper laminations interspersed with the iron laminations.
  • i i Each lamination has a pair of windows which define a central leg and webs between the window and workpiece. A winding of copper tubing extends around the leg within the windows.
  • This invention relates to an improved laminated iron-core induction heating unit for the corners of elongated workpieces of rectangular cross section.
  • my heating unit is particularly useful when embodied in a continuous-casting installation.
  • Conventional practice in continuous casting is to pour liquid metal through an open-ended water-cooled mold.
  • a casting of indefinite length emerges continuously from the lower end of the mold and usually travels through bending and straightening rolls which change its direction of movement to horizontal.
  • As the casting leaves the mold it has a liquid metal core surrounded by only a thin skin of solidified metal.
  • intense water sprays are applied to the surface of the casting through a secondary cooling zone which starts immediately beneath the mold and may extend even beyond the straightening rolls.
  • the casting installation includes a reheating means through which the casting travels ahead of the roll stands.
  • the reheating means must raise the surface temperature of the casting quite uniformly to a predetermined value which commonly lies with extremes of about 2,000 to 2,500" F. Both gas-fired furnaces and induction heating means have been used for this purpose.
  • An object of my invention is to provide an improved laminated iron-core heating unit in which the core fully protects the windings against heat and scale from a workpiece.
  • a further object is to provide an improved unit of the foregoing construction in which the core has windows accommodating the windings and webs fully enclosing the windings.
  • a further object is to provide a unit of the foregoing construction which embodies improved water-cooling means for the core.
  • FIG. 1 is a partially diagrammatic vertical sectional view taken between laminations of an induction heating unit constructed in accordance with my invention.
  • FIG. 2 is a similar view showing a modification.
  • FIG. 1 shows left and right laminations 10 and 10a, a plurality of which are stacked in face-to-face relation to form two mating halves of a core in similar fashion to that shown in the aforementioned patent.
  • Most of the laminations are iron, but preferably I intersperse occasional copper laminations, for example every sixth, as hereinafter explained.
  • the two halves may be upper and lower. Since the two halves are alike, but of opposite hand, I describe only the left half.
  • Each left lamination 10 has a cutout 12 at its inner edge facing the right lamination 10a. The cutouts define a passage to accommodate an elongated workpiece W of rectangular cross section as it travels relatively to the unit.
  • Each lamination has pole pieces 13 and 14 which protrude toward the workpiece at the top and bottom of the cutout l2.
  • each lamination 10 has a pair of windows 15 and 16 which define a central leg 17 and integral webs 18 and 19 at the edges facing the workpiece W.
  • I wind a suitable number of turns of electrically conductive tubing 22 (usually copper) around leg 17.
  • the turns of the winding are insulated from one another and from the leg and are water-cooled in the usual fashion.
  • the spaces around the turns may be filled with suitable insulation material such as an epoxy resin.
  • the inner edges of the laminations carry a centrally located countersunk tube 23 welded to the laminations for circulating cooling water.
  • FIG. 2 shows a modification in which the countersunk tube 23 is replaced by a tube 24 welded to the edges of laminations l0 and protruding into the cutout 12.
  • the tube 24 serves as a guide for the workpiece W, as well as for circulating cooling water.
  • the core may also carry an external water-cooling tube 25 welded thereto. in other respects the modification is similar to the embodiment shown in FIG. 1; hence I have not repeated the description.
  • my heating unit serves to heat the corners of the workpiece W as described in the aforementioned patent.
  • the webs 18 form an unbroken wall which fully encloses the winding 24 and thus fully protects the winding from heat and scale of the workpiece.
  • a major portion of the workpiece already may be at a temperature of 2,000 F or higher when it passes through the cornerheating unit.
  • the webs are comparatively thin (on the order of one-fourth inch). Hence they shunt only a relatively small fraction of the total flux before they become saturated, whereupon the windows act as though they were open slots. Since the webs themselves are exposed to high temperatures, it is necessary to remove heat from the core face through tube 23 or 24.
  • the interspersed copper laminations also assist in removing heat from the core face, since they increase the heat conductivity of the core.
  • my invention affords an induction heating unit of simple construction which overcomes difficulties encountered with the unit shown in the aforesaid patent.
  • the windings are covered with plates bolted to the laminations, leaving open spaces along each edge. Scale may accumulate in these spaces and cause arc-overs and failures.
  • an induction heating unit for the corners of an elongated workpiece of rectangular cross section, which unit includes a core formed of iron laminations and a winding formed of turns of water-cooled electrically conductive tubing, said laminations having cutouts defining a passage to accommodate a workpiece traveling relatively to the unit, the combination therewith of an improved construction to protect said winding from exposure to the workpiece, each of said laminations having a pair of windows defining a central leg and integral webs, the tubing which forms said winding being wound within said windows around said leg, said webs lying between said winding and said passage and forming an unbroken wall therebetween.
  • a combination as defined in claim 1 comprising in addition occasional copper laminations interspersed with said iron laminations.
  • a combination as defined in claim 1 comprising in addition a tube fixed to the inside edges of said laminations for circulating cooling water.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Induction Heating (AREA)
  • Heat Treatment Of Articles (AREA)
US151667A 1971-06-10 1971-06-10 Laminated iron core induction corner-heating unit Expired - Lifetime US3663782A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15166771A 1971-06-10 1971-06-10

Publications (1)

Publication Number Publication Date
US3663782A true US3663782A (en) 1972-05-16

Family

ID=22539760

Family Applications (1)

Application Number Title Priority Date Filing Date
US151667A Expired - Lifetime US3663782A (en) 1971-06-10 1971-06-10 Laminated iron core induction corner-heating unit

Country Status (16)

Country Link
US (1) US3663782A (fr)
AT (1) AT314685B (fr)
AU (1) AU465626B2 (fr)
BE (1) BE784432A (fr)
BR (1) BR7203550D0 (fr)
CA (1) CA953370A (fr)
DE (1) DE2227488A1 (fr)
ES (1) ES403739A1 (fr)
FR (1) FR2140510B1 (fr)
GB (1) GB1365228A (fr)
IT (1) IT959097B (fr)
NL (1) NL7207669A (fr)
PL (1) PL79499B1 (fr)
RO (1) RO60766A (fr)
SU (1) SU427539A3 (fr)
ZA (1) ZA723681B (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4317979A (en) * 1980-05-30 1982-03-02 Westinghouse Electric Corp. High current high frequency current transformer
US4458127A (en) * 1981-05-26 1984-07-03 Park-Ohio Industries, Inc. Inductor for annealing work hardened portions of structural beams
FR2590434A1 (fr) * 1985-11-20 1987-05-22 Siderurgie Fse Inst Rech Inducteur et dispositif de rechauffage inductif de rives d'un produit metallurgique
US4673781A (en) * 1984-06-28 1987-06-16 Electricite De France Electromagnetic induction device for heating metal elements
US5138123A (en) * 1989-11-02 1992-08-11 Blum Gmbh Inductively operated heating apparatus for plastic materials
US5412183A (en) * 1990-05-10 1995-05-02 Rotelec Method and devices for induction heating during the passage of a metallurgical product of elongated shape
US6121591A (en) * 1997-03-13 2000-09-19 Aktiebolaget Electrolux Flux guiding and cooling arrangements for induction heating units
US6262402B1 (en) * 1993-12-16 2001-07-17 Kawasaki Steel Corporation Method and apparatus for joining metal pieces using induction heating
US20050092738A1 (en) * 2003-10-31 2005-05-05 Ring Edmund J. Inductive heating device including an inductive coupling assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2457619A2 (fr) * 1979-05-23 1980-12-19 Siderurgie Fse Inst Rech Four de rechauffage a induction a champ glissant
US4714808A (en) * 1986-09-02 1987-12-22 Fmc Corporation Induction heating pressure welding with linear bus bar joint
DE3717742C2 (de) * 1987-05-26 1997-12-18 Blum Gmbh & Co E Vorrichtung zum induktiven Erhitzen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2664541A (en) * 1950-11-24 1953-12-29 Gen Electric Electric ballast
US2832877A (en) * 1956-09-11 1958-04-29 Asea Ab Cross-field furnace having auxiliary poles without coils
US2902572A (en) * 1957-03-05 1959-09-01 Penn Induction Company Induction heating of metal strip
US3562470A (en) * 1969-06-24 1971-02-09 Westinghouse Electric Corp Induction heating apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2664541A (en) * 1950-11-24 1953-12-29 Gen Electric Electric ballast
US2832877A (en) * 1956-09-11 1958-04-29 Asea Ab Cross-field furnace having auxiliary poles without coils
US2902572A (en) * 1957-03-05 1959-09-01 Penn Induction Company Induction heating of metal strip
US3562470A (en) * 1969-06-24 1971-02-09 Westinghouse Electric Corp Induction heating apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4317979A (en) * 1980-05-30 1982-03-02 Westinghouse Electric Corp. High current high frequency current transformer
US4458127A (en) * 1981-05-26 1984-07-03 Park-Ohio Industries, Inc. Inductor for annealing work hardened portions of structural beams
US4673781A (en) * 1984-06-28 1987-06-16 Electricite De France Electromagnetic induction device for heating metal elements
FR2590434A1 (fr) * 1985-11-20 1987-05-22 Siderurgie Fse Inst Rech Inducteur et dispositif de rechauffage inductif de rives d'un produit metallurgique
EP0266470A1 (fr) * 1985-11-20 1988-05-11 Rotelec Inducteur et dispositif de réchauffage inductif de rives d'un produit métallurgique
US5138123A (en) * 1989-11-02 1992-08-11 Blum Gmbh Inductively operated heating apparatus for plastic materials
US5412183A (en) * 1990-05-10 1995-05-02 Rotelec Method and devices for induction heating during the passage of a metallurgical product of elongated shape
US6262402B1 (en) * 1993-12-16 2001-07-17 Kawasaki Steel Corporation Method and apparatus for joining metal pieces using induction heating
US6121591A (en) * 1997-03-13 2000-09-19 Aktiebolaget Electrolux Flux guiding and cooling arrangements for induction heating units
US20050092738A1 (en) * 2003-10-31 2005-05-05 Ring Edmund J. Inductive heating device including an inductive coupling assembly

Also Published As

Publication number Publication date
RO60766A (fr) 1977-10-15
IT959097B (it) 1973-11-10
BR7203550D0 (pt) 1973-05-03
AT314685B (de) 1974-04-25
DE2227488A1 (de) 1972-12-28
ZA723681B (en) 1973-09-26
FR2140510B1 (fr) 1977-08-26
SU427539A3 (ru) 1974-05-05
NL7207669A (fr) 1972-12-12
ES403739A1 (es) 1975-05-01
FR2140510A1 (fr) 1973-01-19
PL79499B1 (fr) 1975-06-30
BE784432A (fr) 1972-12-05
GB1365228A (en) 1974-08-29
AU4297472A (en) 1973-12-06
CA953370A (en) 1974-08-20
AU465626B2 (en) 1975-10-02

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