EP0013218B1 - Installation de chauffage par induction de produits métallurgiques plats - Google Patents

Installation de chauffage par induction de produits métallurgiques plats Download PDF

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Publication number
EP0013218B1
EP0013218B1 EP79401023A EP79401023A EP0013218B1 EP 0013218 B1 EP0013218 B1 EP 0013218B1 EP 79401023 A EP79401023 A EP 79401023A EP 79401023 A EP79401023 A EP 79401023A EP 0013218 B1 EP0013218 B1 EP 0013218B1
Authority
EP
European Patent Office
Prior art keywords
products
inductor
tunnel
path
flat
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
Application number
EP79401023A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0013218A1 (fr
Inventor
René Courdille
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0013218A1 publication Critical patent/EP0013218A1/fr
Application granted granted Critical
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Expired 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
    • H05B6/10—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

Definitions

  • the subject of the present invention is an installation for the induction heating of metallurgical products according to the preamble of claim 1.
  • Document DE-A-1 176 773 discloses an oven of this type which includes a coil-shaped inductor and transport means which, in order not to pass through the coil, comprise at least one frame with two rails extending beyond ends of the coil driven in a cyclic movement and cooperating with fixed rails or belonging to a second frame.
  • This provision has many limitations. It only allows the treatment of small products, because the frame is only supported at its ends. It is only applicable to products having a length and a height of the same order, the coil having to be roughly circular for the field to be homogeneous. It is not adaptable to the height of the products, the fractions of the coil being fixed relative to each other.
  • the oven according to document FR 2 328 170 is similar to the previous one, the first frame having a longitudinal reciprocating movement and cooperating with support rods passing through the coil and driven in a vertical reciprocating movement.
  • This oven has the same drawbacks as the previous one. In addition, it requires two mobile mechanisms and the support rods must remain small in order not to create field heterogeneities.
  • the present invention aims to provide an installation of this type that better meets those previously known to the requirements of practice, in particular in that the above drawbacks are eliminated and in that the installation makes it possible to treat flat metallurgical products of very large dimensions, such as slabs, continuously.
  • the installation shown schematically in Figures 1 and 2 is intended for the treatment of slabs.
  • the oven proper of which only a fraction is shown in FIG. 1, is associated with a feed table 10 with side members and a table with unloading rollers 12 on which the slabs are brought by pinch rollers 11.
  • Several ovens can obviously be arranged side by side, the roller tables 12 of all the ovens supplying the same distribution carriage to the rolling mills circulating on paths transverse to the furnace.
  • the products circulate in the oven in the direction of their great length.
  • the oven 9 advantageously comprises an envelope tunnel 13 intended to limit losses thermal.
  • the lower part of the envelope 13 can constitute a deck 14.
  • the casing 13 contains two inductors 16 and 17 intended to provide sliding electric fields in the longitudinal direction of the furnace.
  • the lower inductor 17 is fixed and carried by the platform 14. It is located below the path traveled by the slabs 15. It is protected from the heat radiated by these slabs by an insulating lining 18, for example made of refractory bricks.
  • the inductor 16, which can be suspended from the envelope or carried by tie rods passing through it, has a similar constitution.
  • the suspension tie rods are advantageously carried by a mechanism making it possible to modify the height of the inductor 16, so as to give the air gap between the inductor 16 and the product 15, an optimal value.
  • the oven is provided with means for supporting the advancement of the slabs 15.
  • these means are constituted by a crawl-type conveyor of conventional constitution.
  • This conveyor comprises fixed support feet 19 carried by the platform 14 and distributed longitudinally at sufficiently close intervals to avoid any bending of the slabs.
  • It also has movable feet 20 fixed to a spar 21 placed under the tunnel envelope and to which a mechanism, not shown, allows the movement indicated by the arrow f in FIG. 1 to be imparted and the reverse movement. It can be seen that the movable feet 20 make it possible to advance the slab step by step with a determined advance step.
  • the feet 20 and 19 being in contact with the products at high temperature must be made of suitable material. In practice, materials at least partially non-magnetic will advantageously be used in the portion of the oven where the temperature does not reach the Curie point. It will often be convenient to constitute these feet, throughout the length of the furnace, in refractory material at least in the part in contact with the products 1 5.
  • the inductors 16 and 17 Despite the thermal insulation of the inductors 16 and 17, it will often be necessary to cool them. For this, it will be possible for example to provide the upper inductor 16 with a network of circulation tubes of a refrigerant which penetrates through the casing and leaves it by conduits 22. A pulsed suction may be provided to evacuate the hot air above the inductor 17 in a pulsed manner. This suction will at the same time eliminate any scale that may have formed.
  • the envelope tunnel 13 will usually be made of sheet metal internally lined with refractory. It could constitute an enclosure the sealing of which is sufficient to maintain in the oven the conditioning atmosphere necessary for the treatment of certain special steels.
  • Support devices other than the pilgrim pitch conveyor shown in FIGS. 1 and 2 can be used.
  • the support means consist of two rows of discs 20a of which only the upper parts pass through the lower inductor 17a.
  • the discs 20a are wedged in pairs on drive shafts 21a placed below the tunnel and, consequently, are shielded from the action of the high temperatures prevailing in the oven.
  • the drive mechanisms of the shafts are advantageously provided to make it possible to give the discs a back-and-forth movement in the event of the rolling stop leading to the products remaining in place, in order to avoid any deformation.
  • the control mechanisms of the rollers 20a situated in the terminal part of the oven are, for their part, advantageously provided for discharging the products, after heating, at high speed, which makes it possible to dispense with the pinch rollers 11 or organs of other types necessary in most cases for extraction.
  • the length of the oven is used in full, so that it can be reduced; the products remain permanently flat; the thermal efficiency can be very high given the adjustment possibilities which do not exist in the case of induction furnace with annular inductors; the heating curves can be perfectly adapted to the different shades of metal to be treated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Furnace Details (AREA)
  • Tunnel Furnaces (AREA)
EP79401023A 1978-12-22 1979-12-14 Installation de chauffage par induction de produits métallurgiques plats Expired EP0013218B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7836230 1978-12-22
FR7836230A FR2445085A1 (fr) 1978-12-22 1978-12-22 Installation de chauffage par induction de produits metallurgiques plats

Publications (2)

Publication Number Publication Date
EP0013218A1 EP0013218A1 (fr) 1980-07-09
EP0013218B1 true EP0013218B1 (fr) 1983-11-02

Family

ID=9216483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79401023A Expired EP0013218B1 (fr) 1978-12-22 1979-12-14 Installation de chauffage par induction de produits métallurgiques plats

Country Status (6)

Country Link
US (1) US4321449A (ja)
EP (1) EP0013218B1 (ja)
JP (1) JPS5590097A (ja)
BE (1) BE880706A (ja)
DE (1) DE2966381D1 (ja)
FR (1) FR2445085A1 (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2547402B1 (fr) * 1983-06-13 1988-08-12 Cem Comp Electro Mec Dispositif de chauffage de produits metalliques au defile par induction
GB8319660D0 (en) * 1983-07-21 1983-08-24 Force Eng Ltd Travelling wave induction heater
FR2568359B1 (fr) * 1984-07-27 1987-01-09 Siderurgie Fse Inst Rech Dispositif pour l'homogeneisation en temperature par voie inductive de produits metalliques en defilement
US5230822A (en) * 1989-11-15 1993-07-27 Lever Brothers Company, Division Of Conopco, Inc. Wax-encapsulated particles
DE69224544T2 (de) * 1991-04-18 1998-10-15 Alltrista Corp Verfahren und Vorrichtung zur Trocknung und Härtung einer Beschichtung eines metallischen Substrats

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1079698A (fr) * 1952-07-30 1954-12-01 Siemens Ag Dispositif pour le transport de pièces métalliques à travers une ou plusieurs bobines d'induction
DE1176773B (de) * 1954-03-29 1964-08-27 Deutsche Edelstahlwerke Ag Vorrichtung zum Hindurchfoerdern von Werk-stuecken durch einen Induktor
FR1283314A (fr) * 1960-12-22 1962-02-02 Acec Chauffeuse à induction pour forges
DE1182373B (de) * 1963-05-30 1964-11-26 Siemens Ag Querfeld-Induktionsofen
US3471673A (en) * 1968-02-19 1969-10-07 United States Steel Corp Apparatus for inductively heating a traveling metal slab
US3717740A (en) * 1971-07-09 1973-02-20 Park Ohio Industries Inc Slab heating device
GB1513241A (en) * 1975-05-21 1978-06-07 Nat Res Dev Induction heaters
DE2546563C3 (de) * 1975-10-17 1979-11-29 Aeg-Elotherm Gmbh, 5630 Remscheid Induktions-Durchlaufofen
DE2556057C2 (de) * 1975-12-12 1982-04-01 Sundwiger Eisenhütte Maschinenfabrik Grah & Co, 5870 Hemer Verfahren und Vorrichtung zum Erwärmen von Metallbändern, insbesondere Nichteisen-Metallbändern
FR2339316A1 (fr) * 1976-01-21 1977-08-19 Siderurgie Fse Inst Rech Four de rechauffage a induction a champ glissant

Also Published As

Publication number Publication date
JPH0127554B2 (ja) 1989-05-30
EP0013218A1 (fr) 1980-07-09
DE2966381D1 (en) 1983-12-08
FR2445085B1 (ja) 1981-12-18
JPS5590097A (en) 1980-07-08
US4321449A (en) 1982-03-23
FR2445085A1 (fr) 1980-07-18
BE880706A (fr) 1980-06-19

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