EP0266470B1 - Inductor and induction heating device for the edges of a metallurgical product - Google Patents

Inductor and induction heating device for the edges of a metallurgical product Download PDF

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Publication number
EP0266470B1
EP0266470B1 EP86440097A EP86440097A EP0266470B1 EP 0266470 B1 EP0266470 B1 EP 0266470B1 EP 86440097 A EP86440097 A EP 86440097A EP 86440097 A EP86440097 A EP 86440097A EP 0266470 B1 EP0266470 B1 EP 0266470B1
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EP
European Patent Office
Prior art keywords
poles
axis
edges
product
inductor
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
EP86440097A
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German (de)
French (fr)
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EP0266470A1 (en
Inventor
Philippe Georges
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.)
Rotelec SA
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Rotelec SA
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
Priority to FR8517193A priority Critical patent/FR2590434A1/en
Priority to EP86440042A priority patent/EP0206963B1/en
Application filed by Rotelec SA filed Critical Rotelec SA
Priority to AT86440097T priority patent/ATE73599T1/en
Priority to DE8686440097T priority patent/DE3684323D1/en
Priority to EP86440097A priority patent/EP0266470B1/en
Priority to ES198686440097T priority patent/ES2029997T3/en
Publication of EP0266470A1 publication Critical patent/EP0266470A1/en
Application granted granted Critical
Publication of EP0266470B1 publication Critical patent/EP0266470B1/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
    • H05B6/10—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
    • H05B6/102—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces the metal pieces being rotated while induction heated
    • 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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product

Definitions

  • the invention relates to the inductive heating of the edges of a metallurgical product.
  • the thermal deficit or average temperature difference in the thickness of a slab, between the center and the banks can be of the order of 120 ° C at the outlet of continuous casting, due to the preferential cooling of the banks ( fin effect).
  • the patent document US-A-2,010,622 discloses an inductive heating device for a car crankcase.
  • the cylinder head of this device comprises two movable arms which can be applied against this casing, and a central part, which is also brought closer to the casing to be heated.
  • Two induction coils arranged on either side of this central part of the cylinder head create two partial flows in the two arms which close through the casing on said central part.
  • the object of the invention is to propose a new type of inductor more efficient than known inductors, for reheating the edges of metallurgical products, such as continuous casting slabs.
  • the device for inductive heating of the edges of a moving metallurgical product in accordance with the invention comprises an inductor which consists of an E-shaped cylinder head with wound poles, having two extreme poles aligned on a first axis and facing each other at a distance so as to define between aux an air gap, and a median pole oriented along a second axis perpendicular to the first axis and recessed with respect to the two extreme poles so as not to not encroach on said air gap, the windings of the three poles being arranged so that, in operation, the sum of the fluxes entering or leaving both by the extreme poles is equal to the flux leaving or entering by the middle pole.
  • the inductors are installed so that the path of the edges intersects the air gap of said inductors, the extreme poles being oriented in the direction of the thickness of the product.
  • a magnetic yoke 4 which, in the heating position, has the shape of the capital letter E, in the sense that it defines three poles 5, 6, 7 converging towards the banks 1 of the slab and respectively provided with coils 8, 9, 10.
  • the middle pole 5 is oriented in the width direction of the slab 2 (axis 13), while the extreme poles 6 and 7 are oriented in the thickness direction (axis 14) and is face distance so as to define between them, when empty (that is to say in the absence of product to be heated) an air gap in which a bank of the product to be heated will pass.
  • the extension of the middle pole 5 from its location on the main branch of the cylinder head is such that this pole remains recessed with respect to the extreme poles 6 and 7 so as not to encroach on the air gap.
  • the coils 8, 9, 10 are connected in accordance with the diagram in FIG. 2 so that the intensity of the current flowing in the coil 8 of the middle pole is equal to the sum of the intensities flowing in the coils 9 and 10 of the opposite poles, which intensities are in principle equal. Under these conditions, if the coils have the same number of turns, and if the direction of each winding is appropriate, the incoming flow from the middle pole 5 is equal to the sum of the outgoing flows from poles 6 and 7, and the lines of induction pass through the edge of the slab as shown by the arrows 11, producing the desired local heating.
  • the frequency of supply of the inductors is close to 300 HZ.
  • the inductors 3 are supported by chassis (not shown) making it possible to move them transversely (in the direction of the arrows 12 and in the opposite direction) so as to be able to adapt the position of the inductors to different widths of product.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)

Abstract

The inductor consists of an ''E'' - shaped yoke (4) with wound poles, having two end poles (6, 7) aligned with a first axis (13) and facing one another, thus defining between them a free no-load air-gap for the passage of one edge of the product, and a central pole (5) pointing along a second axis (14) perpendicular to the first axis (13) and set back relative to the end poles so as not to overlap the said air-gap, the windings (8, 9, 10) of these poles being configured so that, whilst operating, the sum of both the fluxes entering or leaving through the end poles (6, 7) is equal to the flux leaving or entering through the central pole (5). <IMAGE>

Description

L'invention concerne le réchauffage inductif des rives d'un produit métallurgique.The invention relates to the inductive heating of the edges of a metallurgical product.

Pour une installation de laminage de brames couplée directement à une installation de coulée continue, il s'avère souhaitable de réchauffer les bords des brames, afin d'obtenir un produit thermiquement homogène à l'entrée du train dégrossisseur. En effet, le déficit thermique ou écart de température moyenne dans l'épaisseur d'une brame, entre le centre et les rives peut être de l'ordre de 120°C en sortie de coulée continue, en raison du refroidissement préférentiel des rives (effet d'ailette).For a slab rolling installation directly coupled to a continuous casting installation, it is desirable to reheat the edges of the slabs, in order to obtain a thermally homogeneous product at the entry of the roughing train. Indeed, the thermal deficit or average temperature difference in the thickness of a slab, between the center and the banks can be of the order of 120 ° C at the outlet of continuous casting, due to the preferential cooling of the banks ( fin effect).

Il a déjà été proposé, pour effacer les hétérogénéités des rives d'un produit métallurgique, un réchauffage par induction, localisé aux rives, à l'aide d'inducteurs à culasse magnétique en forme de U disposés au dessus et au dessous du produit, celui-ci défilant à l'horizontale dans l'entrefer constitué entre deux inducteurs superposés dont les pôles magnétiques contraires se font face.It has already been proposed, to erase the heterogeneities of the edges of a metallurgical product, an induction heating, located on the edges, using inductors with magnetic U-shaped yoke arranged above and below the product, the latter parading horizontally in the air gap formed between two superimposed inductors whose opposite magnetic poles face each other.

Par le document de brevet US-A-2.010.622 on connaît un dispositif de réchauffage inductif d'un carter de voitures. La culasse de ce dispositif comporte deux bras mobiles qui peuvent être appliqués contre ce carter, et une partie centrale, qui est également rapprochée du carter à réchauffer. Deux bobines d'induction disposées de part et autre de cette partie centrale de la culasse créent deux flux partiels dans les deux bras qui se referment à travers le carter sur ladite partie centrale.The patent document US-A-2,010,622 discloses an inductive heating device for a car crankcase. The cylinder head of this device comprises two movable arms which can be applied against this casing, and a central part, which is also brought closer to the casing to be heated. Two induction coils arranged on either side of this central part of the cylinder head create two partial flows in the two arms which close through the casing on said central part.

Le but de l'invention est de proposer un nouveau type d'inducteur plus performant que les inducteurs connus, pour le réchauffage de rives des produits métallurgiques, tels que les brames de coulée continue.The object of the invention is to propose a new type of inductor more efficient than known inductors, for reheating the edges of metallurgical products, such as continuous casting slabs.

Le dispositif de réchauffage inductif des rives d'un produit métallurgique en déplacement conforme à l'invention comporte un inducteur qui est constitué d'une culasse en E à pôles bobinés, ayant deux pôles extrêmes alignés sur un premier axe et se faisant face à distance de manière à définir entre aux un entrefer, et un pôle médian orienté selon un second axe perpendiculaire au premier axe et disposé en retrait par rapport aux deux pôles extrêmes afin de ne pas empiéter ledit entrefer, les bobinages des trois pôles étant agencés de manière que, en fonctionnement, la somme des flux entrant ou sortant tous deux par les pôles extrêmes soit égale au flux sortant ou entrant par le pôle médian.The device for inductive heating of the edges of a moving metallurgical product in accordance with the invention comprises an inductor which consists of an E-shaped cylinder head with wound poles, having two extreme poles aligned on a first axis and facing each other at a distance so as to define between aux an air gap, and a median pole oriented along a second axis perpendicular to the first axis and recessed with respect to the two extreme poles so as not to not encroach on said air gap, the windings of the three poles being arranged so that, in operation, the sum of the fluxes entering or leaving both by the extreme poles is equal to the flux leaving or entering by the middle pole.

Une telle constitution réduit au minimum l'entrefer, correspondant à la distance parcourue hors culasse par le champ magnétique, en supposant que celui-ci suit le chemin privélégié que lui impose la culasse. D'autre part, cette disposition permet une meilleure concentration du flux dans le produit. Dans le dispositif de réchauffage conforme à l'invention, les inducteurs sont implantés de manière que le trajet des rives coupe l'entrefer desdits inducteurs, les pôles extrêmes étant orientés dans le sens de l'épaisseur du produit.Such a constitution minimizes the air gap, corresponding to the distance traveled outside the cylinder head by the magnetic field, assuming that the latter follows the preferred path imposed by the cylinder head. On the other hand, this arrangement allows a better concentration of the flow in the product. In the heating device according to the invention, the inductors are installed so that the path of the edges intersects the air gap of said inductors, the extreme poles being oriented in the direction of the thickness of the product.

D'autres caractéristiques et avantages ressortiront de la description suivante d'un mode préféré de réalisation. Il sera fait référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue schématique transversale d'une installation de réchauffage inductif des rives d'une brame montrant deux inducteurs en E conformes à l'invention.
  • la figure 2 est un schéma de branchement des bobines d'un inducteur conforme à l'invention.
Other characteristics and advantages will emerge from the following description of a preferred embodiment. Reference will be made to the appended drawings in which:
  • Figure 1 is a schematic transverse view of an installation for inductive heating of the edges of a slab showing two inductors in E according to the invention.
  • Figure 2 is a connection diagram of the coils of an inductor according to the invention.

Sur la figure 1, on voit que les rives 1 de la brame 2, laquelle défile dans le sens perpendiculaire au plan du dessin, passent dans l'entrefer des inducteurs 3.In FIG. 1, it can be seen that the edges 1 of the slab 2, which scrolls in the direction perpendicular to the plane of the drawing, pass through the air gap of the inductors 3.

Ceux-ci comportent une culasse magnétique 4 qui, en position de chauffage, a la forme de la lettre majuscule E, en ce sens qu'elle définit trois pôles 5, 6, 7 convergeant vers les rives 1 de la brame et dotés respectivement de bobines 8, 9, 10. Le pôle médian 5 est orienté dans le sens de la largeur de la brame 2 (axe 13), tandis que les pôles extrêmes 6 et 7 sont orientés dans le sens de son épaisseur (axe 14) et se font face à distance de manière à définir entre eux, à vide (c'est-à-dire en l'absence de produit à chauffer) un entrefer dans lequel défilera une rive du produit à chauffer. A cet effet, l'extension du pôle médian 5 depuis son implantation sur la branche principale de la culasse est telle que ce pôle reste en retrait par rapport aux pôles extrêmes 6 et 7 afin de ne pas empiéter sur l'entrefer.These comprise a magnetic yoke 4 which, in the heating position, has the shape of the capital letter E, in the sense that it defines three poles 5, 6, 7 converging towards the banks 1 of the slab and respectively provided with coils 8, 9, 10. The middle pole 5 is oriented in the width direction of the slab 2 (axis 13), while the extreme poles 6 and 7 are oriented in the thickness direction (axis 14) and is face distance so as to define between them, when empty (that is to say in the absence of product to be heated) an air gap in which a bank of the product to be heated will pass. To this end, the extension of the middle pole 5 from its location on the main branch of the cylinder head is such that this pole remains recessed with respect to the extreme poles 6 and 7 so as not to encroach on the air gap.

Les bobines 8, 9, 10 sont branchées conformément au schéma de la figure 2 de sorte que l'intensité du courant circulant dans la bobine 8 du pôle médian soit égale à la somme des intensités circulant dans les bobines 9 et 10 des pôles opposés, lesquelles intensités sont en principe égales. Dans ces conditions, si les bobines comportent un même nombre de spires, et si le sens de chaque enroulement est approprié, le flux rentrant du pôle médian 5 est égal à la somme des flux sortants des pôles 6 et 7, et les lignes d'induction passent au travers du bord de la brame comme représenté par les flèches 11, en y produisant le réchauffement local désiré. La fréquence d'alimentation des inducteurs est voisine de 300 HZ.The coils 8, 9, 10 are connected in accordance with the diagram in FIG. 2 so that the intensity of the current flowing in the coil 8 of the middle pole is equal to the sum of the intensities flowing in the coils 9 and 10 of the opposite poles, which intensities are in principle equal. Under these conditions, if the coils have the same number of turns, and if the direction of each winding is appropriate, the incoming flow from the middle pole 5 is equal to the sum of the outgoing flows from poles 6 and 7, and the lines of induction pass through the edge of the slab as shown by the arrows 11, producing the desired local heating. The frequency of supply of the inductors is close to 300 HZ.

Les inducteurs 3 sont supportés par des châssis non représentés permettant de les déplacer transversalement (dans le sens des flèches 12 et en sens inverse) de manière à pouvoir adapter la position des inducteurs à différentes largeurs de produit.The inductors 3 are supported by chassis (not shown) making it possible to move them transversely (in the direction of the arrows 12 and in the opposite direction) so as to be able to adapt the position of the inductors to different widths of product.

Claims (2)

  1. A device for inductively heating the edges (1) of a moving metallurgical product (2), said device comprising inductors and being characterised in that each inductor (3) is composed of an E-shaped yoke (4) with three wire-wound poles, the yoke having two end poles (6, 7) aligned on a first axis (14) and facing each other in such a way as to define an air gap between them which is empty when unloaded to receive an edge of the product (2), and a middle pole (5) pointing along a second axis (13) perpendicular to the first axis (14), the middle pole being set back relative to the end poles in such a way as not to overlap the said air gap; the coils (8, 9, & 10) of these poles being arranged in such a way that, in operation, the total magnetic flux entering or leaving the two end poles (6, 7) is equal to the flux leaving or entering the middle pole (5).
  2. A device according to claim 1, characterised in that the inductors (3) are mounted on supports which are movable transversally to the structure through which the metallurgical product moves.
EP86440097A 1985-06-07 1986-11-06 Inductor and induction heating device for the edges of a metallurgical product Expired - Lifetime EP0266470B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
FR8517193A FR2590434A1 (en) 1985-11-20 1985-11-20 Inductor and device for inductive reheating of edges of a metallurgical product
EP86440042A EP0206963B1 (en) 1985-06-07 1986-06-02 Inductor with a variable air gap for induction heating the edges of a metallurgical product
AT86440097T ATE73599T1 (en) 1985-11-20 1986-11-06 INDUCTOR AND INDUCTION HEATING PLANT OF THE EDGES OF A METALLURGICAL PRODUCT.
DE8686440097T DE3684323D1 (en) 1985-11-20 1986-11-06 INDUCTOR AND INDUCTION HEATING SYSTEM OF THE EDGES OF A METALLURGICAL PRODUCT.
EP86440097A EP0266470B1 (en) 1985-11-20 1986-11-06 Inductor and induction heating device for the edges of a metallurgical product
ES198686440097T ES2029997T3 (en) 1985-11-20 1986-11-06 INDUCTOR AND INDUCTIVE HEATING DEVICE OF EDGES OF A METALLURGICAL PRODUCT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8517193A FR2590434A1 (en) 1985-11-20 1985-11-20 Inductor and device for inductive reheating of edges of a metallurgical product
EP86440097A EP0266470B1 (en) 1985-11-20 1986-11-06 Inductor and induction heating device for the edges of a metallurgical product

Publications (2)

Publication Number Publication Date
EP0266470A1 EP0266470A1 (en) 1988-05-11
EP0266470B1 true EP0266470B1 (en) 1992-03-11

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EP86440097A Expired - Lifetime EP0266470B1 (en) 1985-06-07 1986-11-06 Inductor and induction heating device for the edges of a metallurgical product

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EP (1) EP0266470B1 (en)
JP (1) JPS6324584A (en)
AT (1) ATE73599T1 (en)
DE (1) DE3684323D1 (en)
ES (1) ES2029997T3 (en)
FR (1) FR2590434A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190133965A (en) * 2018-05-24 2019-12-04 주식회사 다원시스 Induction Heating Apparatus

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2590434A1 (en) * 1985-11-20 1987-05-22 Siderurgie Fse Inst Rech Inductor and device for inductive reheating of edges of a metallurgical product
FR2661849B1 (en) * 1990-05-10 1995-03-17 Siderurgie Fse Inst Rech METHOD AND DEVICES FOR INDUCTION HEATING OF A METALLURGICAL PRODUCT IN AN ELONGATE SHAPE.
US5841023A (en) * 1993-08-31 1998-11-24 Boehringer Mannheim Corporation Magnet for medical instrument
CN101438620B (en) * 2006-04-24 2011-12-07 感应加热有限公司 Electric induction heat treatment of an end of tubular material
DE102007051144B4 (en) * 2007-07-26 2010-06-02 Zenergy Power Gmbh Induction heater and method for adjusting the width of the wells of such induction heater
FR3035766B1 (en) * 2015-04-29 2019-10-11 Sncf Mobilites INDUCTION HEATING DEVICE FOR METALLIC PARTS AND RAILWAY VEHICLE COMPRISING SUCH A DEVICE
DE102015112293A1 (en) * 2015-07-28 2017-02-02 Hydro Aluminium Rolled Products Gmbh Method and apparatus for the adaption of temperature-adapting metal bands
IT201700020203A1 (en) * 2017-02-22 2018-08-22 Rotelec Sa HEATING SYSTEM FOR METAL PRODUCTS

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206963A1 (en) * 1985-06-07 1986-12-30 Institut De Recherches De La Siderurgie Francaise (Irsid) Inductor with a variable air gap for induction heating the edges of a metallurgical product

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Publication number Priority date Publication date Assignee Title
US2010622A (en) * 1933-03-20 1935-08-06 Ray A Brown Housing heater
FR2118330A5 (en) * 1970-12-17 1972-07-28 Westinghouse Electric Corp
US3663782A (en) * 1971-06-10 1972-05-16 United States Steel Corp Laminated iron core induction corner-heating unit
FR2590434A1 (en) * 1985-11-20 1987-05-22 Siderurgie Fse Inst Rech Inductor and device for inductive reheating of edges of a metallurgical product

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0206963A1 (en) * 1985-06-07 1986-12-30 Institut De Recherches De La Siderurgie Francaise (Irsid) Inductor with a variable air gap for induction heating the edges of a metallurgical product

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190133965A (en) * 2018-05-24 2019-12-04 주식회사 다원시스 Induction Heating Apparatus

Also Published As

Publication number Publication date
ATE73599T1 (en) 1992-03-15
JPS6324584A (en) 1988-02-01
FR2590434A1 (en) 1987-05-22
DE3684323D1 (en) 1992-04-16
EP0266470A1 (en) 1988-05-11
ES2029997T3 (en) 1992-10-16

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