US3674971A - Induction heating coil constructed to minimize vibration and noise - Google Patents

Induction heating coil constructed to minimize vibration and noise Download PDF

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Publication number
US3674971A
US3674971A US142870A US3674971DA US3674971A US 3674971 A US3674971 A US 3674971A US 142870 A US142870 A US 142870A US 3674971D A US3674971D A US 3674971DA US 3674971 A US3674971 A US 3674971A
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US
United States
Prior art keywords
coil
frame
tubing
tunnel
noise
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
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US142870A
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English (en)
Inventor
William A Emerson
John A Redmond
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United States Steel Corp
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United States Steel Corp
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Filing date
Publication date
Application filed by United States Steel Corp filed Critical United States Steel Corp
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Publication of US3674971A publication Critical patent/US3674971A/en
Anticipated expiration legal-status Critical
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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

Definitions

  • ABSTRACT An induction heating coil which is constructed to minimize vibration and noise despite heavy loads and high voltage.
  • the coil includes a tubing formed into a plurality of turns mounted in a frame.
  • the tubing defines a tunnel through which a workpiece travels continuously in the direction of its length.
  • Sectional water-cooled metal plates are placed over the ends of the tunnel and connected with tie bolts.
  • the bolts carry Belleville washers or springs which are tightened to flatness.
  • our coil is particularly useful for reheating continuously cast metal workpieces preliminary to in-line rolling of the workpiece.
  • Conventional practice in continuous-casting is to pass a partially solidified workpiece of indefinite length through a series of water sprays while it is traveling downwardly immediately after it leaves the mold. Next the workpiece travels through a roll rack which changes its direction of travel from vertical or inclined to horizontal. The sprays chill the surface of the workpiece quite drastically, whereby the workpiece ultimately solidifies throughout. As a result, the surface regions cool below the temperature at which the workpiece can be hotrolled.
  • in-line rolling it is necessary to reheat the workpiece to bring its surface temperature back to about 2,000 F or higher before it enters a work-roll stand.
  • This reheating operation is performed by passing the workpiece continuously through suitable heating means located between the final roll rack and the in-line work rolls. In actual practice gas-fired furnaces or a series of induction coils have been used as the heating means.
  • induction coils used for reheating it to hot-rolling temperature must carry heavy loads at high voltage.
  • a conventional induction coil includes a number of turns of water-cooled insulated copper tubing defining a tunnel" through which the workpiece travels. At the load required, the continual current reversals tend to produce excessive vibrations in the turns of the coil. The resulting noise may exceed the tolerable limit for workmen in the surrounding area.
  • An object of our invention is to provide an improved induction coil of the foregoing type, which coil can carry heavy loads without excessive vibration or noise.
  • a further object is to provide a coil of the foregoing type in which the turns are held against vibration by a novel arrangement of sectional metal end plates and tie bolts, and in which we protect the end plates against overheating.
  • a further object is to provide a coil of the foregoing type which is readily installed in a line or removed with a minimum of parts to be handled.
  • FIG. 1 is a side elevational view with our improved coil
  • FIG. 2 is an end elevational view of our coil.
  • Our coil includes a large number of turns (54 in one example) of tubing of copper or the like shaped to define a tunnel through which a workpiece W may travel continuously in the direction of its length.
  • the workpiece is a billet square in cross section and the turns are square with slightly rounded corners, but the size, shape and number of turns vary with the cross section, composition, and temperature of the workpiece with which the coil is used.
  • the tubing is continuous from end-to-end of the coil and its turns are heavily insulated from one another.
  • the bore of the tubing is divided into sections of a few turns each for cooling purpose.
  • the tubing is mounted within a frame 12.
  • Water inlet and discharge manifolds l3 and 14 are mounted in the lower portion of the frame and extend parallel with the tunnel axis at opposite sides thereof.
  • the inlet manifold 13 has a series of offtakes 15 each connected to a different cooling section of the tubing through respective hoses 16.
  • the cooling sections are connected to the discharge manifold 14 through hoses l7 and intakes 1 8.
  • the upper face of the tubing carries a hose-supporting bracket 19 through which hoses 17 extend.
  • the manifolds carry quick-disconnect fittings 20 depending below the frame 12 through which cooling water enters and leaves the coil.
  • Frame 12 is removably mounted on a supporting structure which includes a base 22.
  • the underside of the frame includes a pair of inwardly facing channels 23.
  • Longitudinally extendparts broken away of ing bars 24 are fixed to the lower flanges of channels 23 and are removably bolted to the base 22.
  • the base carries upstanding tapered locating pins 25 received in corresponding holes in bars 24, whereby we may easily position the frame on the base when installing the coil.
  • the tubing is energized from a pair of terminals 26 and 27 mounted on the underside of frame 12 near one end.
  • Conductors 28 and 29 extend from the respective terminals to locations beneath the ends of the tubing.
  • Flexible connectors 30 and 31 connect the respective conductors 28 and 29 with the tubing to avoid breaking the electrical connection if some vibration occurs.
  • Frame 12 carries insulating blocks 34 of Transite or equivalent material, which blocks cover opposite ends of the tunnel.
  • insulating blocks 34 of Transite or equivalent material which blocks cover opposite ends of the tunnel.
  • each plate is formed of a lower section 35 of U-shape in outline and an upper section 36 of inverted U-shape in outline.
  • tie bolts 37 through the two lower sections 35 outside the turns 10 end-to-end of the coil and parallel with the tunnel axis.
  • tie bolts 38 through the two upper sections 36.
  • Each tie bolt carries nuts 39 and a plurality of Belleville washers or springs 40. We tighten nuts 39 to the extent that the Belleville washers are substantially flat. With this construction we are able to compress the turns 10 tightly enough that there is very little vibration.
  • our invention affords an induction heating coil which can carry heavy loads and yet is free of excessive vibration and noise.
  • our coil is particularly useful for reheating continuously cast workpieces, it is apparent it has broader utility where analogous problems are encountered.
  • an induction heating coil which includes a frame, an insulated electrically conductive tubing mounted in said frame and formed into a plurality of turns defining a tunnel through which a workpiece may travel continuously in the direction of its length, inlet and discharge means for cooling water connected to said tubing, and insulating blocks covering opposite ends of said tunnel, the combination therewith of improved means for minimizing vibration and noise when said coil carries heavy loads at high voltage, said improved means comprising sectional metal end plates covering said blocks, a plurality of tie bolts extending between said end plates end-to-end of the coil, nuts and spring means on said tie bolts capable of being tightened to substantially prevent vibration, and means for water-cooling said end plates.
  • each of said plates is divided into a lower section of U-shape in outline and an upper section of inverted U-shape in outline.
  • a coil as defined in claim 1 further comprising flexible connectors attached to the ends of said tubing through which the tubing is electrically energized.
  • said structure comprising a base to which said frame is bolted, said base having an upstanding tapered locating-pin, said frame having a hole receiving said pin.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
US142870A 1971-05-13 1971-05-13 Induction heating coil constructed to minimize vibration and noise Expired - Lifetime US3674971A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14287071A 1971-05-13 1971-05-13

Publications (1)

Publication Number Publication Date
US3674971A true US3674971A (en) 1972-07-04

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ID=22501622

Family Applications (1)

Application Number Title Priority Date Filing Date
US142870A Expired - Lifetime US3674971A (en) 1971-05-13 1971-05-13 Induction heating coil constructed to minimize vibration and noise

Country Status (12)

Country Link
US (1) US3674971A (enExample)
JP (1) JPS4849039A (enExample)
AR (1) AR192777A1 (enExample)
AU (1) AU459911B2 (enExample)
BE (1) BE783220A (enExample)
BR (1) BR7202935D0 (enExample)
CA (1) CA923982A (enExample)
DE (1) DE2222760A1 (enExample)
FR (1) FR2137811B1 (enExample)
IT (1) IT958862B (enExample)
NL (1) NL7206356A (enExample)
ZA (1) ZA723041B (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860737A (en) * 1974-01-11 1975-01-14 Gte Sylvania Inc Furnace and method for induction heating moving quantities of material
FR2821925A1 (fr) * 2001-03-06 2002-09-13 Celes Enceinte d'etancheite au gaz et au vide d'isolation thermique destinee a un dispositif de chauffage par induction
US20040188424A1 (en) * 2001-08-27 2004-09-30 Thomas Jeffrey R. Method and apparatus for delivery of induction heating to a workpiece

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2587794B1 (fr) * 1985-09-26 1987-12-18 Aces Four a induction a basse ou moyenne frequence

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188440A (en) * 1962-12-26 1965-06-08 Int Harvester Co High frequency inductor assembly
US3320398A (en) * 1964-08-05 1967-05-16 Ohio Crankshaft Co Induction heating coil assembly
US3424886A (en) * 1966-10-27 1969-01-28 Ajax Magnethermic Corp Induction heating
US3485983A (en) * 1967-09-25 1969-12-23 Ajax Magnethermic Corp Apparatus for induction heating of slabs
US3497658A (en) * 1968-03-20 1970-02-24 Ajax Magnethermic Corp Method and apparatus for induction heating of slabs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188440A (en) * 1962-12-26 1965-06-08 Int Harvester Co High frequency inductor assembly
US3320398A (en) * 1964-08-05 1967-05-16 Ohio Crankshaft Co Induction heating coil assembly
US3424886A (en) * 1966-10-27 1969-01-28 Ajax Magnethermic Corp Induction heating
US3485983A (en) * 1967-09-25 1969-12-23 Ajax Magnethermic Corp Apparatus for induction heating of slabs
US3497658A (en) * 1968-03-20 1970-02-24 Ajax Magnethermic Corp Method and apparatus for induction heating of slabs

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860737A (en) * 1974-01-11 1975-01-14 Gte Sylvania Inc Furnace and method for induction heating moving quantities of material
FR2821925A1 (fr) * 2001-03-06 2002-09-13 Celes Enceinte d'etancheite au gaz et au vide d'isolation thermique destinee a un dispositif de chauffage par induction
US6693264B2 (en) 2001-03-06 2004-02-17 Celes Vacuum and gas tight enclosure for induction heating system
US20040188424A1 (en) * 2001-08-27 2004-09-30 Thomas Jeffrey R. Method and apparatus for delivery of induction heating to a workpiece
US7122770B2 (en) * 2001-08-27 2006-10-17 Illinois Tool Works Inc. Apparatus for delivery of induction heating to a workpiece

Also Published As

Publication number Publication date
NL7206356A (enExample) 1972-11-15
BR7202935D0 (pt) 1973-05-15
AU4210672A (en) 1973-11-15
CA923982A (en) 1973-04-03
IT958862B (it) 1973-10-30
BE783220A (fr) 1972-11-09
FR2137811A1 (enExample) 1972-12-29
AU459911B2 (en) 1975-04-10
FR2137811B1 (enExample) 1975-08-01
JPS4849039A (enExample) 1973-07-11
DE2222760A1 (de) 1972-11-30
ZA723041B (en) 1973-02-28
AR192777A1 (es) 1973-03-14

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Legal Events

Date Code Title Description
AS Assignment

Owner name: USX CORPORATION, A CORP. OF DE, STATELESS

Free format text: MERGER;ASSIGNOR:UNITED STATES STEEL CORPORATION (MERGED INTO);REEL/FRAME:005060/0960

Effective date: 19880112