EP0206963A1 - Inductor with a variable air gap for induction heating the edges of a metallurgical product - Google Patents

Inductor with a variable air gap for induction heating the edges of a metallurgical product Download PDF

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Publication number
EP0206963A1
EP0206963A1 EP86440042A EP86440042A EP0206963A1 EP 0206963 A1 EP0206963 A1 EP 0206963A1 EP 86440042 A EP86440042 A EP 86440042A EP 86440042 A EP86440042 A EP 86440042A EP 0206963 A1 EP0206963 A1 EP 0206963A1
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EP
European Patent Office
Prior art keywords
branches
cylinder head
inductor
inductors
edges
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Granted
Application number
EP86440042A
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German (de)
French (fr)
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EP0206963B1 (en
Inventor
Philippe Georges
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Rotelec SA
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Institut de Recherches de la Siderurgie Francaise IRSID
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Priority to AT86440042T priority Critical patent/ATE49096T1/en
Priority claimed from EP86440097A external-priority patent/EP0266470B1/en
Publication of EP0206963A1 publication Critical patent/EP0206963A1/en
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Publication of EP0206963B1 publication Critical patent/EP0206963B1/en
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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
    • 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, and in particular of the edges of blanks of flat product on a belt train.
  • the blank After leaving the roughing train and before entering the finishing train, the blank stays on the waiting table for approximately 1 minute to 1 minute 30 minutes. Its average dimensions are then commonly 30 to 50 mm thick, 1 to 2 m in width and up to 70 m in length.
  • the area "affected" by localized cooling can extend over a distance of more than 70 mm from an edge and that the average temperature difference over the thickness reaches about 75 ° C on this distance, the average temperature remaining more or less constant beyond and up to 70 mm from the other edge.
  • inductors with a magnetic cylinder head in the form of a " ⁇ " through the opening of which passes the product to be heated (edges of strips or wires and bars), the ends of the cylinder head facing each other and advantageously serving for supporting the windings of the electric excitation current conductor so as to form wound magnetic poles of opposite polarities: FR-A-2 489 645 - (EDF); FR-A-2 555 353- (CEM) or EP -A-0 170 556 - (EDF).
  • the object of the invention is to propose a new inductive heating device which is more efficient than the known device.
  • the device according to the invention comprises inductors with an "L" shaped magnetic yoke arranged laterally “astride” on the path of the banks, the ends of the yoke facing each other and serving as a support for winding of the conductors so as to constitute wound magnetic poles of opposite polarities, and characterized in that, in order to be able to modify the air gap, this yoke is formed of two lower and upper branches, joined by a pivoting articulation around a horizontal axis, each branch being constituted by a laminate bearing, at least at the level of the joint, two lateral flanges in which are housed two rotation half-shafts which do not pass through the laminate, and a functional play of semi-cylindrical shape is provided between the laminates of the two branches.
  • the yields have been established experimentally for the two devices, under identical conditions (rough 40 mm thick, 15 mm thermal insulation, 15 mm product-insulation distance): the yield is 60 % for the inductor in "C", and approximately 50% for the inductor in "U".
  • the induction is distributed on the pair of poles.
  • the induction is therefore less concentrated and the induced power profile more diffuse than with the "C” inductors according to the invention.
  • the inductors of the invention can adapt to the conformations taken by the moving metal strip to be heated on the banks, better than quickly retracting, if necessary, during the passage of the strip head, or of the tail, generally curved, by simple tilting, towards the rear, of the upper branch of the breech.
  • means for adjusting the degree of opening of the branches are provided, such as a jack, controlled by a set metallurgical product detection and position sensors.
  • the very design of the articulation according to the invention promotes a high electrical efficiency of the inductor, while benefiting from a simple technology, since there is no rotation shaft passing through the laminated from the cylinder head (and which otherwise should be provided with cooling means). It is emphasized, if necessary, that the low functional play of semi-cylindrical shape between the branches at the level of the joint has a double role: not to artificially create additional air gaps, at the same time as ensuring a guiding of the lines of magnetic field in the cylinder head, despite the deformations of the geometry thereof caused during pivoting.
  • the inductor 1 consists of a cylinder head 2, 3 (or core) of laminated ferromagnetic sheet, shaped as "C", and, the ends of which, forming the magnetic poles, face each other and serve as a support for the electrical windings. 4 and 5 placed opposite, wound in the same direction and supplied with alternating current at a frequency of several hundred Hz.
  • a metallurgical product in strip 6 runs in the direction of arrow 7 in the air gap of the inductor 1 (space separating the two poles of the C). The edges of the strip 6 are heated by the eddy currents which develop there.
  • a thermal protection 23, such as a shield 23 made of refractory material, is preferably provided (FIG. 3) to protect the poles from the radiation of the product 6.
  • the magnetic yoke consists of two branches 2 and 3 articulated around an axis 8 located substantially in the middle of the body of the "C".
  • the laminates 2a and 3a of the upper 2 and lower 3 branches are clamped between attached flanges 2b and 3b in which the joint is produced: two half-shafts -or pivots- 8a, 8b, which do not cross the laminate, but aligned on the axis 8 on either side of the laminate, are hooped in the flanges 3b forming a chappe.
  • the half-shafts 8a, 8b carry bearings 9 whose outer cage is hooped in the flanges 2b of the upper branch 2 and which straddle the flanges 3b of the lower branch 3 at the joint.
  • the flanges laterally cover the entire cylinder head. This is not essential. The main thing is that these flanges are provided at least at the location of the joint.
  • the laminates 2a, 3a are shaped as a cylindrical portion of axis 8 at their articulated end, so as to leave between them only a simple functional clearance 10 (approximately 1 mm) resulting in the smallest magnetic leakage flux possible, whatever the geometrical configuration of the inductor.
  • the lower half-branch 3 is supported by an arm 11, itself connected to a spar 12 common to a row of inductors (cf. fig. 2) located, for example, upstream of a finishing train 19.
  • a double-acting cylinder 13 articulated, on the one hand, on the arm 11, on the other hand, on the upper half-branch 2, has its pressure chambers connected to an actuator 14 controlled by a set of sensors 15 for position of the metallurgical product 6.
  • the sensors 15 also control, by means of jacks not shown, the lateral movement of the side members 12 in the direction of one or the other of the arrows 16 (fig. 2).
  • FIGS. 5A and 5B show the steps for placing the inductors.
  • the inductors 1 are in the separated position, and open, so as to leave completely the passage to the strip 6, and in particular to the strip head which can be bent upwards and therefore could not pass normally into the air gap of the inductors in working position.
  • the jacks controlling the movement of the side members 12 are actuated so as to bring the inductors 1, in the direction of the arrows 17 (fig. 5A), to the product 6.
  • the upper half-branches 2 actuated by the jacks 14, tilt in the direction of the arrows 18 (fig. 5B) so as to "close” the inductor, until reaching the desired air gap depending on the nature and geometry of the metallurgical product 6 .
  • any lateral deviations of the product 6 can be taken into account by a consequent lateral displacement of the inductors 1.
  • the upper branch is retracted by tilting backwards using the jacks 13.
  • the lateral guidance of the inductors also makes it possible to adapt the reheating device to different widths of metallurgical product.
  • the lateral guidance of the inductors represents an embodiment, admittedly advantageous, but by no means imperative, if, by example it is always the same product or type of product which scrolls in the air gap and that its scrolling is well controlled.
  • the location of the joint can, of course, be chosen on the body of the " "elsewhere than in the middle.

Abstract

This device for inductively heating the edges of an advancing metallurgical product (6) comprises inductors with a "C"-shaped magnetic yoke with coiled poles, disposed laterally astride the path of the edges; the two branches (2, 3) of the C are hinged in order to be opened more or less, an actuator system regulating the opening of the said hinged branches (2, 3). <IMAGE>

Description

L'invention concerne le réchauffage inductif des rives d'un produit métallurgique, et notamment des rives d'ébauches de produit plat sur un train à bande.The invention relates to the inductive heating of the edges of a metallurgical product, and in particular of the edges of blanks of flat product on a belt train.

Après sa sortie du train dégrossisseur et avant de s'engager dans le train finisseur, l'ébauche séjourne environ 1 min à 1 min 30 sur la table d'attente. Ses dimensions moyennes sont alors couramment de 30 à 50 mm d'épaisseur, 1 à 2 m de largeur et jusqu'à 70 m de longueur.After leaving the roughing train and before entering the finishing train, the blank stays on the waiting table for approximately 1 minute to 1 minute 30 minutes. Its average dimensions are then commonly 30 to 50 mm thick, 1 to 2 m in width and up to 70 m in length.

En plus d'un refroidissement global important (de l'ordre de 100°C), on observe un refroidissement préférentiel des rives dû à une plus grande surface d'échange à ces endroits (effet d'ailette).In addition to significant overall cooling (of the order of 100 ° C), there is a preferential cooling of the banks due to a larger exchange surface at these locations (fin effect).

On s'aperçoit que la zone "affectée" par le refroidissement localisé peut s'étendre sur une distance de plus de 70 mm à partir d'un bord et que l'écart de température moyenne sur l'épaisseur atteint environ 75°C sur cette distance, la température moyenne restant à peu près constante au delà et jusqu'à 70 mm de l'autre bord.We see that the area "affected" by localized cooling can extend over a distance of more than 70 mm from an edge and that the average temperature difference over the thickness reaches about 75 ° C on this distance, the average temperature remaining more or less constant beyond and up to 70 mm from the other edge.

Ce refroidissement localisé induit trois inconvénients majeurs :

  • - pour maintenir une température minimale en tout point de la bande au train finisseur (température de fin de laminage), il convient de surchauffer la brame au four de réchauffage.
  • - un profil thermique hétérogène en fin de laminage conduit à des caractéristiques métallurgiques non homogènes sur la largeur de bande.
  • - les rives froides entraînent une usure plus marquée des cylindres du train finisseur et ce phénomène implique des contraintes d'ordonnancement dans la mise en fabrication des bandes (cône de laminage). Cette règle est une des limites à la progression de l'enfournement chaud.
This localized cooling induces three major drawbacks:
  • - to maintain a minimum temperature at any point on the strip at the finishing train (end of rolling temperature), the slab should be overheated in the reheating oven.
  • - a heterogeneous thermal profile at the end of rolling leads to non-homogeneous metallurgical characteristics over the strip width.
  • - the cold edges lead to more marked wear of the cylinders of the finishing train and this phenomenon implies scheduling constraints in the manufacturing of the strips (rolling cone). This rule is one of the limits to the progress of the hot oven.

Des problèmes analogues se posent pour le laminage des tôles fortes.Similar problems arise for the rolling of heavy plates.

La mise en place d'un tunnel sur la table d'attente pourrait atténuer le gradient de température en rive en freinant le refroidissement global de l'ébauche. De plus, l'adjonction de brûleurs réchauffant préférentiellement les bords diminuerait de façon plus marquée le gradient thermique en rive. Cependant, ce chauffage par flamme ne permet pas de répartir un profil de puissance adapté au problème.The installation of a tunnel on the waiting table could attenuate the temperature gradient at the edge by slowing the overall cooling of the blank. In addition, the addition of burners preferentially heating the edges would reduce the thermal gradient on the shore more markedly. However, this flame heating does not make it possible to distribute a power profile adapted to the problem.

Il a déjà été proposé, pour effacer les hétérogénéités des rives, un réchauffage localisé par induction, avec des inducteurs à culasse magnétique en forme de U disposes sur et sous les rives d'ébauche : le produit défile dans l'entrefer constitué entre deux inducteurs superposés dont les pôles magnétiques de polarité contraire se font face.It has already been proposed, in order to erase the heterogeneities of the edges, localized heating by induction, with inductors with magnetic U-shaped yoke arranged on and under the rough edges: the product passes through the air gap formed between two inductors superimposed whose magnetic poles of opposite polarity face each other.

On connaît, dans des applications similaires, des inducteurs à culasse magnétique en forme de "□" dans l'ouverture duquel passe le produit à chauffer (rives de bandes ou fils et barres), les extrémités de la culasse se faisant face et servant avantageusement de support aux enroulements du conducteur de courant électrique d'excitation de manière à constituer des pôles magnétiques bobinés de polarités opposées : FR-A-2 489 645 - (EDF) ; FR-A-2 555 353-(CEM) ou EP -A-0 170 556 - (EDF).There are known, in similar applications, inductors with a magnetic cylinder head in the form of a "□" through the opening of which passes the product to be heated (edges of strips or wires and bars), the ends of the cylinder head facing each other and advantageously serving for supporting the windings of the electric excitation current conductor so as to form wound magnetic poles of opposite polarities: FR-A-2 489 645 - (EDF); FR-A-2 555 353- (CEM) or EP -A-0 170 556 - (EDF).

Le but de l'invention est de proposer un nouveau dispositif de réchauffage inductif plus performant que le dispositif connu.The object of the invention is to propose a new inductive heating device which is more efficient than the known device.

A cet effet, le dispositif conforme à l'invention comprend des inducteurs à culasse magnétique en forme de "L" disposés latéralement "à cheval" sur le trajet des rives, les extrémités de la culasse se faisant face et servant chacune de support d'enroulement des conducteurs de manière à constituer des pôles magnétiques bobinés de polarités opposées, et caractérisé en ce que, afin de pouvoir modifier l'entrefer, cette culasse est formée de deux branches inférieure et supérieure, réunies par une articulation à pivotement autour d'un axe horizontal, chaque branche étant constituée par un feuilleté portant, au moins au niveau de l'articulation, deux flasques latéraux dans lequels sont logés deux demi-arbres de rotation qui ne traversent pas le feuilleté, et un jeu fonctionnel de forme demi-cylindrique est ménagé entre les feuilletés des deux branches.To this end, the device according to the invention comprises inductors with an "L" shaped magnetic yoke arranged laterally "astride" on the path of the banks, the ends of the yoke facing each other and serving as a support for winding of the conductors so as to constitute wound magnetic poles of opposite polarities, and characterized in that, in order to be able to modify the air gap, this yoke is formed of two lower and upper branches, joined by a pivoting articulation around a horizontal axis, each branch being constituted by a laminate bearing, at least at the level of the joint, two lateral flanges in which are housed two rotation half-shafts which do not pass through the laminate, and a functional play of semi-cylindrical shape is provided between the laminates of the two branches.

On sait que l'entrefer, correspondant schématiquement à la distance parcourue "hors culasse" par le champ magnétique en supposant que celui-ci suit le chemin privilégié qui lui impose la culasse, est le facteur essentiel du rendement électrique de l'inducteur. C'est pourquoi on cherche à minimiser ce paramètre.We know that the air gap, corresponding schematically to the distance traveled "outside the cylinder head" by the magnetic field, assuming that it follows the preferred path which imposes the cylinder head on it, is the essential factor in the electrical efficiency of the inductor. This is why we seek to minimize this parameter.

Or, si on se fixe des contraintes mécaniques identiques pour le dispositif de réchauffage connu et le dispositif de l'invention, c'est à dire une même distance ébauche-pôle magnétique, avec une isolation thermique identique des pôles, il est clair que l'entrefer entre les deux paires de pôles de l'inducteur en "U" est deux fois plus important que l'entrefer entre les deux pôles de l'inducteur en "C" conforme à l'invention. Le rendement de celui-ci est donc meilleur. A titre d'exemple, les rendements ont été établis expérimentalement pour les deux dispositifs, dans des conditions identiques (ébauche de 40 mm d'épaisseur, isolation thermique de 15 mm, distance produit-isolation de 15 mm) : le rendement est de 60 % pour l'inducteur en "C ", et d'environ 50 % pour l'inducteur en "U".However, if identical mechanical stresses are fixed for the known reheating device and the device of the invention, that is to say the same blank-magnetic pole distance, with identical thermal insulation of the poles, it is clear that the 'air gap between the two pairs of poles of the inductor "U" is twice as large as the air gap between the two poles of the inductor "C" according to the invention. The yield thereof is therefore better. By way of example, the yields have been established experimentally for the two devices, under identical conditions (rough 40 mm thick, 15 mm thermal insulation, 15 mm product-insulation distance): the yield is 60 % for the inductor in "C", and approximately 50% for the inductor in "U".

De plus, pour les inducteurs en "U", l'induction se répartit sur la paire de pôles. Pour un même nombre d'ampères- tours de bobines, l'induction est donc moins concentrée et le profil de puissance induite plus diffus qu'avec les inducteurs en "C" conformes à l'invention.In addition, for the inductors in "U", the induction is distributed on the pair of poles. For the same number of ampere-turns of the coils, the induction is therefore less concentrated and the induced power profile more diffuse than with the "C" inductors according to the invention.

Grâce à la possibilité qu'ils offrent de pouvoir modifier leur entrefer, les inducteurs de l'invention peuvent s'adapter aux conformations prises par la bande métallique en défilement à réchauffer en rives, de mieux que s'escamoter rapidement, le cas échéant, lors du passage de la tête de bande, ou de la queue, généralement incurvées, par simple basculement, vers l'arrière, de la branche supérieure de la culasse.Thanks to the possibility that they offer of being able to modify their air gap, the inductors of the invention can adapt to the conformations taken by the moving metal strip to be heated on the banks, better than quickly retracting, if necessary, during the passage of the strip head, or of the tail, generally curved, by simple tilting, towards the rear, of the upper branch of the breech.

A cet effet, des moyens de réglage du degré d'ouverture des branches sont prévus, tel qu'un vérin, asservis à un ensemble de capteurs de détection et de position du produit métallurgique. En outre, la conception même de l'articulation, selon l'invention, favorise un rendement électrique élevé de l'inducteur, tout en bénéficiant d'une technologie simple, puisqu'il n'y a pas d'arbre de rotation traversant le feuilleté de la culasse (et qui, autrement, devrait être pourvu de moyens de refroidissement). On souligne, au besoin, que le faible jeu fonctionnel de forme semi-cylindrique entre les branches au niveau de l'articulation a un double rôle : ne pas créer artificiellement des entrefers supplémentaires, en même temps que d'assurer un guidage des lignes de champ magnétique dans la culasse, malgré les déformations de la géométrie de celle-ci occasionnées lors des pivotements.To this end, means for adjusting the degree of opening of the branches are provided, such as a jack, controlled by a set metallurgical product detection and position sensors. In addition, the very design of the articulation according to the invention promotes a high electrical efficiency of the inductor, while benefiting from a simple technology, since there is no rotation shaft passing through the laminated from the cylinder head (and which otherwise should be provided with cooling means). It is emphasized, if necessary, that the low functional play of semi-cylindrical shape between the branches at the level of the joint has a double role: not to artificially create additional air gaps, at the same time as ensuring a guiding of the lines of magnetic field in the cylinder head, despite the deformations of the geometry thereof caused during pivoting.

D'autres avantages et caractéristiques de l'invention ressortiront de la description ci-après, faisant référence aux dessins annexés sur lesquels :

  • - la figure 1 représente en perspective schématique un mode de réalisation d'inducteur en "C" articulé, selon l'invention,
  • - la figure 2 représente en perspective une implantation d'inducteurs en "C" articulé dans une installation de réchauffage des rives d'ébauches de bandes d'acier,
  • - la figure 3 représente schématiquement en vue latérale un dispositif d'actionnement de l'inducteur en "
    Figure imgb0001
    " articulé, permettant de régler le degré d'ouverture de l'entrefer,
  • - la figure 4 est une section IV-IV de l'inducteur de la figure 3,
  • - les figures 5A et 5B sont deux vues schématiques montrant les étapes de mise en place des inducteurs en "
    Figure imgb0002
    "articulé,
Other advantages and characteristics of the invention will emerge from the description below, referring to the appended drawings in which:
  • FIG. 1 is a diagrammatic perspective view of an embodiment of an articulated "C" inductor according to the invention,
  • FIG. 2 is a perspective view of an implantation of hinged "C" inductors in an installation for heating the edges of blanks of steel strips,
  • - Figure 3 shows schematically in side view an actuator of the inductor in "
    Figure imgb0001
    "articulated, allowing to adjust the degree of opening of the air gap,
  • FIG. 4 is a section IV-IV of the inductor of FIG. 3,
  • - Figures 5A and 5B are two schematic views showing the steps of setting up the inductors in "
    Figure imgb0002
    "Speak clearly,

L'inducteur 1 est constitué d'une culasse 2, 3 (ou noyau) en tôle ferromagnétique feuilletée, conformée en "C", et, dont les extrémités, formant les pôles magnétiques, se font face et servent de support pour les enroulements électriques 4 et 5 placés en vis à vis, bobinés dans le même sens et alimentés en courant alternatif sous une fréquence de plusieurs centaines de Hz. Un produit métallurgique en bande 6 défile dans le sens de la flèche 7 dans l'entrefer de l'inducteur 1 (espace séparant les deux pôles du C). Les rives de la bande 6 sont réchauffées par les courants de Foucault qui s'y développent. Une protection thermique 23, telle qu'un bouclier 23 en matière réfractaire, est de préférence prévue (fig. 3) pour protéger les pôles du rayonnement du produit 6.The inductor 1 consists of a cylinder head 2, 3 (or core) of laminated ferromagnetic sheet, shaped as "C", and, the ends of which, forming the magnetic poles, face each other and serve as a support for the electrical windings. 4 and 5 placed opposite, wound in the same direction and supplied with alternating current at a frequency of several hundred Hz. A metallurgical product in strip 6 runs in the direction of arrow 7 in the air gap of the inductor 1 (space separating the two poles of the C). The edges of the strip 6 are heated by the eddy currents which develop there. A thermal protection 23, such as a shield 23 made of refractory material, is preferably provided (FIG. 3) to protect the poles from the radiation of the product 6.

La culasse magnétique est constituée de deux branches 2 et 3 articulées autour d'un axe 8 situé sensiblement au milieu du corps du "C". Comme on le voit clairement sur la fig. 4 les feuilletés 2a et 3a des branches supérieure 2 et inférieure 3 sont serrés entre des flasques rapportés 2b et 3b dans lequels est réalisée l'articulation : deux demi-arbres -ou pivots- 8a, 8b, qui ne traversent pas le feuilleté, mais alignés sur l'axe 8 de part et d'autre du feuilleté, sont frettés dans les flasques 3b formant une chappe. Les demi-arbres 8a, 8b portent des roulements 9 dont la cage extérieure est frettée dans les flasques 2b de la branche supérieure 2 et qui viennent à califourchon sur les flasques 3b de la branche inférieure 3 au niveau de l'articulation.The magnetic yoke consists of two branches 2 and 3 articulated around an axis 8 located substantially in the middle of the body of the "C". As can be clearly seen in FIG. 4 the laminates 2a and 3a of the upper 2 and lower 3 branches are clamped between attached flanges 2b and 3b in which the joint is produced: two half-shafts -or pivots- 8a, 8b, which do not cross the laminate, but aligned on the axis 8 on either side of the laminate, are hooped in the flanges 3b forming a chappe. The half-shafts 8a, 8b carry bearings 9 whose outer cage is hooped in the flanges 2b of the upper branch 2 and which straddle the flanges 3b of the lower branch 3 at the joint.

Dans l'exemple représenté sur les figures, les flasques recouvrent latéralement l'intégralité de la culasse. Cela n'est pas indispensable. L'essentiel est que ces flasques soient prévus au moins à l'endroit de l'articulation.In the example shown in the figures, the flanges laterally cover the entire cylinder head. This is not essential. The main thing is that these flanges are provided at least at the location of the joint.

Les feuilletés 2a, 3a sont conformés en portion cylindrique d'axe 8 à leur extrémité articulée, de manière à ne laisser entre-eux qu'un simple jeu fonctionnel 10 (environ 1 mm) entrai- nant un flux de fuites magnétiques le plus réduit possible, quelque soit la configuration géométrique de l'inducteur. La demi-branche inférieure 3 est supportée par un bras 11, lui-même relié à un longeron 12 commun à une rangée d'inducteurs (cf. fig. 2) implantés, par exemple, en amont d'un train finisseur 19. Un vérin double-effet 13 articulé, d'une part, sur le bras 11, d'autre part, sur la demi-branche supérieure 2, a ses chambres de pression reliées à un actionneur 14 asservi à un ensemble de capteurs 15 de position du produit métallurgique 6. Les capteurs 15 commandent également, au moyen de vérins non représentés, le déplacement latéral des longerons 12 dans le sens de l'une ou l'autre des flèches 16 (fig. 2).The laminates 2a, 3a are shaped as a cylindrical portion of axis 8 at their articulated end, so as to leave between them only a simple functional clearance 10 (approximately 1 mm) resulting in the smallest magnetic leakage flux possible, whatever the geometrical configuration of the inductor. The lower half-branch 3 is supported by an arm 11, itself connected to a spar 12 common to a row of inductors (cf. fig. 2) located, for example, upstream of a finishing train 19. A double-acting cylinder 13 articulated, on the one hand, on the arm 11, on the other hand, on the upper half-branch 2, has its pressure chambers connected to an actuator 14 controlled by a set of sensors 15 for position of the metallurgical product 6. The sensors 15 also control, by means of jacks not shown, the lateral movement of the side members 12 in the direction of one or the other of the arrows 16 (fig. 2).

Par la combinaison des mouvements de guidage latéral et de pivotement vertical des inducteurs en "C ", il est possible de résoudre les problèmes d'engagement ou de désengagement du produit métallurgique en bande 6, ainsi que les problèmes liés aux variations de position du produit dans l'entrefer en cours de défilement.By the combination of lateral guiding and vertical pivoting movements of the inductors at "C", it is possible to solve the problems of engagement or disengagement of the metallurgical product in strip 6, as well as the problems linked to variations in the position of the product. in the air gap while scrolling.

Les figures 5A et 5B montrent les étapes de mise en place des inducteurs. Les inducteurs 1 sont en position écartée, et ouverte, de manière à laisser complètement le passage à la bande 6, et notamment à la tête de bande qui peut être recourbée vers le haut et ne pourrait donc pas passer normalement dans l'entrefer des inducteurs en position de travail. Quand le produit 6 est en place, les vérins commandant le déplacement des longerons 12 sont actionnés de manière à rapprocher les inducteurs 1, dans le sens des flèches 17 (fig. 5A), du produit 6. Ensuite, les demi-branches supérieures 2, actionnées par les vérins 14, basculent dans le sens des flèches 18 (fig. 5B) de manière à "fermer" l'inducteur, jusqu'à atteindre l'entrefer désiré en fonction de la nature et de la géométrie du produit métallurgique 6.FIGS. 5A and 5B show the steps for placing the inductors. The inductors 1 are in the separated position, and open, so as to leave completely the passage to the strip 6, and in particular to the strip head which can be bent upwards and therefore could not pass normally into the air gap of the inductors in working position. When the product 6 is in place, the jacks controlling the movement of the side members 12 are actuated so as to bring the inductors 1, in the direction of the arrows 17 (fig. 5A), to the product 6. Then, the upper half-branches 2 , actuated by the jacks 14, tilt in the direction of the arrows 18 (fig. 5B) so as to "close" the inductor, until reaching the desired air gap depending on the nature and geometry of the metallurgical product 6 .

En cours de défilement, les éventuelles déviations latérales du produit 6 peuvent être prises en compte par un déplacement latéral conséquent des inducteurs 1.During scrolling, any lateral deviations of the product 6 can be taken into account by a consequent lateral displacement of the inductors 1.

En fin de défilement, là où la queue de bande incurvée pourrait endommager les inducteurs 1, on procède à l'escamotage de la branche supérieure par basculement vers l'arrière à l'aide des vérins 13.At the end of scrolling, where the curved strip tail could damage the inductors 1, the upper branch is retracted by tilting backwards using the jacks 13.

Le guidage latéral des inducteurs permet aussi d'adapter le dispositif de réchauffage à différentes largeurs de produit métallurgique.The lateral guidance of the inductors also makes it possible to adapt the reheating device to different widths of metallurgical product.

Toutefois, contrairement à l'articulation de la culasse, le guidage latéral des inducteurs représente une forme de réalisation, certes avantageuse, mais nullement impérative, si, par exemple c'est toujours le même produit ou type de produit qui défile dans l'entrefer et que son défilement est bien maîtrisé. De même, la localisation de l'articulation peut, bien entendu, être choisie sur le corps du "

Figure imgb0003
" ailleurs qu'en son milieu.However, unlike the cylinder head articulation, the lateral guidance of the inductors represents an embodiment, admittedly advantageous, but by no means imperative, if, by example it is always the same product or type of product which scrolls in the air gap and that its scrolling is well controlled. Similarly, the location of the joint can, of course, be chosen on the body of the "
Figure imgb0003
"elsewhere than in the middle.

Claims (9)

1. Dispositif de réchauffage inductif de rives d'un produit métallurgique en défilement, du type comportant des inducteurs à culasse magnétique en forme d'un "C ", disposés latéralement "à cheval" sur le trajet des rives, les extrémités de la culasse se faisant face et formant des pôles magnétiques bobinés de polarités opposées, dispositif caractérisé en ce que, dans le but de pouvoir modifier l'écartement desdits pôles, la culasse est formée de deux branches (2, 3) réunies par une articulation à pivotement autour d'un axe (8), chaque branche étant constituée par un feuilleté (2a, 3a) portant, au moins au niveau de l'articulation, deux flasques latéraux (2b, 3b) dans lesquels sont logés deux demi-arbres et rotation (8a, 8b) qui ne traversent pas le feuilleté, et en ce que un jeu fonctionnel (10) de forme demi-cylindrique est ménagé entre les feuilletés (2a, 2b) des deux branches.1. Device for inductive heating of the edges of a moving metallurgical product, of the type comprising inductors with a magnetic cylinder head in the shape of a "C", arranged laterally "astride" on the path of the banks, the ends of the cylinder head facing each other and forming wound magnetic poles of opposite polarities, device characterized in that, in order to be able to modify the spacing of said poles, the yoke is formed of two branches (2, 3) joined together by a pivoting articulation around an axis (8), each branch being constituted by a laminate (2a, 3a) carrying, at least at the level of the articulation, two lateral flanges (2b, 3b) in which are housed two half-shafts and rotation ( 8a, 8b) which do not pass through the laminate, and in that a functional clearance (10) of semi-cylindrical shape is formed between the laminates (2a, 2b) of the two branches. 2. Dispositif selon la revendication 1, caractérisé en ce que des moyens (13, 14) de réglage du degré d'écartement des branches articulées (2, 3) sont prévus, asservis à un ensemble de capteurs (15) de position du produit métallurgique (6).2. Device according to claim 1, characterized in that means (13, 14) for adjusting the degree of spacing of the articulated branches (2, 3) are provided, controlled by a set of sensors (15) for the position of the product metallurgical (6). 3. Dispositif selon la revendication 2 caractérisé en ce que lesdits moyens de réglage comprenent un vérin double effet (13)3. Device according to claim 2 characterized in that said adjustment means comprise a double-acting cylinder (13) 4. Dispositif selon la revendication 2 ou 3 caractérisé en ce que lesdits moyens de réglage exercent leur effet sur la branche supérieure (2) de la culasse des inducteurs.4. Device according to claim 2 or 3 characterized in that said adjusting means exert their effect on the upper branch (2) of the cylinder head of the inductors. 5. Dispositif selon la revendication 2, caractérisé en ce que les inducteurs sont pourvus de moyens (11, 12) de guidage latéral.5. Device according to claim 2, characterized in that the inductors are provided with means (11, 12) for lateral guidance. 6. Inducteur destiné à un dispositif de réchauffage inductif des rives d'un produit métallurgique en défilement, et présentant une culasse magnétique en forme de "C", à pôles bobinés se faisant face, caractérisé en ce que ladite culasse est formée de deux branches (2, 3) réunies par une articulation autour d'un axe de rotation (8), chaque branche étant formée par un feuilleté (2a, 3a) de tôles ferromagnétiques portant deux flasques latéraux (2b, 3b) dans lesquels sont logés deux pivots (8a, 8b) de part et d'autre des feuilletés et alignés sur l'axe (8), en ce que un jeu fonctionnel de forme demi-cylindrique (10) et ménagé entre les deux branches, et en ce que des moyens (13, 14) sont prévus pour régler l'écartement des branches.6. Inductor intended for a device for inductive heating of the edges of a moving metallurgical product, and having a magnetic cylinder head in the shape of "C", with wound poles facing each other, characterized in that said cylinder head is formed of two branches (2, 3) joined by an articulation around an axis of rotation (8), each branch being formed by a laminated (2a, 3a) of ferromagnetic sheets carrying two lateral flanges (2b, 3b) in which are housed two pivots (8a, 8b) on either side of the laminated and aligned on the axis (8), in that a functional play of semi-cylindrical shape (10) and formed between the two branches, and in that means (13, 14) are provided for adjusting the spacing of the branches. 7. Inducteur selon la revendication 6, caractérisé en ce que lesdits moyens de réglage comprenent un vérin double effet (13).7. Inductor according to claim 6, characterized in that said adjustment means comprise a double-acting cylinder (13). 8. Inducteur selon la revendication 6 ou 7 caractérisé en ce que lesdits moyens de réglage exerce leur effet sur la branche supérieure (2) de la culasse.8. Inductor according to claim 6 or 7 characterized in that said adjustment means exerts their effect on the upper branch (2) of the cylinder head. 9. Inducteur selon la revendication 6 à 7, caractérisé en ce que ses pôles sont dotés d'une protection thermique (23).9. Inductor according to claim 6 to 7, characterized in that its poles are provided with thermal protection (23).
EP86440042A 1985-06-07 1986-06-02 Inductor with a variable air gap for induction heating the edges of a metallurgical product Expired EP0206963B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86440042T ATE49096T1 (en) 1985-06-07 1986-06-02 INDUCTOR WITH VARIABLE AIR GAP FOR EDGE INDUCTION HEATING OF A METALLURGICAL PRODUCT.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR8508684 1985-06-07
FR8508684A FR2583249B1 (en) 1985-06-07 1985-06-07 DEVICE FOR INDUCTIVELY HEATING THE RIVES OF A METALLURGICAL PRODUCT AND VARIABLE GAP INDUCTOR
EP86440097A EP0266470B1 (en) 1985-11-20 1986-11-06 Inductor and induction heating device for the edges of a metallurgical product

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EP0206963A1 true EP0206963A1 (en) 1986-12-30
EP0206963B1 EP0206963B1 (en) 1989-12-27

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EP (1) EP0206963B1 (en)
JP (1) JPH0690948B2 (en)
AT (1) ATE49096T1 (en)
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DE (1) DE3667893D1 (en)
ES (1) ES8705738A1 (en)
FR (1) FR2583249B1 (en)

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US4810843A (en) * 1986-06-20 1989-03-07 Brown, Boveri & Cie Ag Device for inductively heating the edges of elongated moving workpieces
EP0438130A2 (en) * 1990-01-17 1991-07-24 Sumitomo Heavy Industries, Ltd An electromagnetic induction heater
EP0266470B1 (en) * 1985-11-20 1992-03-11 Rotelec Inductor and induction heating device for the edges of a metallurgical product
DE4207607C1 (en) * 1992-03-10 1993-09-23 Otto Junker Gmbh, 52152 Simmerath, De
CN110506449A (en) * 2017-02-22 2019-11-26 罗特勒克股份有限公司 Heating device for metal product

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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.
US5847370A (en) * 1990-06-04 1998-12-08 Nordson Corporation Can coating and curing system having focused induction heater using thin lamination cores
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US5999077A (en) * 1998-12-10 1999-12-07 The United States Of America As Represented By The Secretary Of The Navy Voltage controlled variable inductor
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KR101254472B1 (en) * 2006-08-31 2013-04-12 개리 앤. 소르티노 Bond head assembly and system
JP4912912B2 (en) * 2007-02-16 2012-04-11 新日本製鐵株式会社 Induction heating device
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JPWO2011074383A1 (en) * 2009-12-14 2013-04-25 新日鐵住金株式会社 Induction heating apparatus control apparatus, induction heating system, and induction heating apparatus control method
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EP0266470B1 (en) * 1985-11-20 1992-03-11 Rotelec Inductor and induction heating device for the edges of a metallurgical product
US4810843A (en) * 1986-06-20 1989-03-07 Brown, Boveri & Cie Ag Device for inductively heating the edges of elongated moving workpieces
EP0438130A2 (en) * 1990-01-17 1991-07-24 Sumitomo Heavy Industries, Ltd An electromagnetic induction heater
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CN110506449A (en) * 2017-02-22 2019-11-26 罗特勒克股份有限公司 Heating device for metal product
CN110506449B (en) * 2017-02-22 2022-04-05 罗特勒克股份有限公司 Heating device for metal products

Also Published As

Publication number Publication date
ES8705738A1 (en) 1987-05-01
FR2583249A1 (en) 1986-12-12
JPH0690948B2 (en) 1994-11-14
CA1272252A (en) 1990-07-31
FR2583249B1 (en) 1989-04-28
ATE49096T1 (en) 1990-01-15
US4708325A (en) 1987-11-24
DE3667893D1 (en) 1990-02-01
ES555786A0 (en) 1987-05-01
EP0206963B1 (en) 1989-12-27
JPS6251188A (en) 1987-03-05

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