EP0013218A1 - Induction heating apparatus for flat metallurgical products - Google Patents

Induction heating apparatus for flat metallurgical products Download PDF

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Publication number
EP0013218A1
EP0013218A1 EP79401023A EP79401023A EP0013218A1 EP 0013218 A1 EP0013218 A1 EP 0013218A1 EP 79401023 A EP79401023 A EP 79401023A EP 79401023 A EP79401023 A EP 79401023A EP 0013218 A1 EP0013218 A1 EP 0013218A1
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Prior art keywords
products
tunnel
installation according
inductors
support
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EP79401023A
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German (de)
French (fr)
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EP0013218B1 (en
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René Courdille
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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
    • 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 induction heating of flat metallurgical products, comprising a tunnel provided with means for supporting the products arranged flat along the tunnel in the direction of their great length and means of heating by electrical induction, placed one above and the other below the products.
  • the present invention aims to provide a continuous operation installation, which avoids the passage of very hot slabs in the open air, is applicable even for very large widths and allows support for slabs at very close intervals, a factor favorable to the maintenance of 'excellent linearity.
  • the invention provides in particular an installation of the above kind, characterized in that the support means are distinct from the lower heating means and constitute means for the progressive advancement of the products along the tunnel.
  • the heating means will generally be polyphase plane inductors and will provide a sliding field.
  • the lower inductor will advantageously be crossed by the support and advancement means.
  • the inductors can obviously be provided to dissipate in the product a variable power along the path. For example, it may be desirable to dissipate a high power in the upstream part of the oven, to quickly bring the products to a required temperature. In the downstream part, a lower power is sufficient to maintain this temperature. It will generally be advantageous to split the oven, lengthwise, into several sections provided with separate temperature control means, making it possible to adjust the powers dissipated in fractions of inductors occupying the successive sections. The temperature rise curves can thus be adapted to the various shades of metal to be treated and create, if necessary, a final homogenization zone.
  • the support and advancement means may in particular be constituted by a pilgrim pitch conveyor supporting the products by fingers crossing that of the inductors which is placed below the path of the products. These fingers are integral with a mechanism which is below the inductor, which makes it possible to place the latter in the immediate vicinity of the product to be heated.
  • the support and advancement means can also be constituted by disks crossing that of the inductors which is placed below the path of the products and wedged on shafts situated outside the tunnel, with continuous advancement or step by step.
  • 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 long length.
  • the oven 9 advantageously comprises an envelope tunnel 13 intended to limit the heat losses.
  • 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 plate 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 and advancing the slabs 15.
  • these means are constituted by a conveyor with crawl steps of conventional constitution.
  • This conveyor comprises fixed support legs 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 shell 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.
  • 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, of refractory material at least in the part in contact with the products 15.
  • the width of which hardly exceeds two meters two longitudinal rows are sufficient. 20 feet apart for example by one meter. Since the flexural and creep resistance of metallurgical products decreases as the temperature increases, it will often be advantageous to reduce the interval between two successive feet in the hottest areas: one can for example use a spacing of several meters in the entry zone of the furnace where the metal is at moderate temperature, and go down to a value of the order of a meter in the hottest zones.
  • the inductors 16 and 17 Despite the thermal insulation of the inductors 16 and 17, it will often be necessary to cool them.
  • 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 whose sealing is sufficient to maintain in the furnace 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 removed from the action of the high temperatures prevailing in the oven.
  • the drive mechanisms of the shafts are advantageously provided to enable the discs to move back and forth 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; professionals duits 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.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Induction Heating (AREA)
  • Tunnel Furnaces (AREA)
  • Furnace Details (AREA)

Abstract

Une installation de chauffage par induction de produits métallurgiques plats, tels que lopins et brames, comporte un tunnel muni d'un convoyeur (20,21) de support et d'avancement pas à pas des produits le long du tunnel, dans le sens de la grande longueur dés produits. Des moyens de chauffage électriques comportant au moins deux inducteurs polyphasés (16,17) de création de champ glissant dans le sens longitudinal du four sont placés l'un au-dessus, l'autre àu-dessous, du trajet des produits (15) à plat.An installation for induction heating of flat metallurgical products, such as slabs and slabs, comprises a tunnel provided with a conveyor (20,21) for support and step-by-step advancement of the products along the tunnel, in the direction of the great length of the products. Electric heating means comprising at least two polyphase inductors (16,17) for creating a sliding field in the longitudinal direction of the oven are placed one above, the other below, the path of the products (15) flat.

Description

La présente invention a pour objet une installation de chauffage par induction de produits métallurgiques plats, comportant un tunnel muni de moyens de support des produits disposés à plat le long du tunnel dans le sens de leur grande longueur et des moyens de chauffage par induction électrique, placés l'un au-dessus et l'autre au-dessous des produits.The subject of the present invention is an installation for induction heating of flat metallurgical products, comprising a tunnel provided with means for supporting the products arranged flat along the tunnel in the direction of their great length and means of heating by electrical induction, placed one above and the other below the products.

De telles installations sont décrites dans les brevets GB 1 513 241 et FR 2 339 316, Suivant le second document, le produit, brame par exemple, est posé sur chant sur un chariot muni d'un socle. Le socle lève la brame dans le four. Une fois la brane chauffée, le socle redescend, le chariot vient sous un second four dans lequel le socle introduit la brame, et ainsi de suite. Un tel processus a de nombreux inconvénients : il n'est pas continu ; il exige de basculer la brame, placée sur plat dans les laminoirs ; il n'utilise pas l'ensemble des possibilités offertes par le chauffage par induction ; les manutentions sont très importantes ; les brames très chaudes circulent à l'air libre et s'oxydent en surface ; l'installation n'est pratiquement pas utilisable pour des brames de très grande longueur ou comportant des chants qui ne sont pas rigoureusement plans et d'équerre avec les faces. Suivant le brevet GB 1 513 241, la brame en cours de chauffage est posée à plat sur les inducteurs inférieurs : on retrouve la plupart des problèmes précédents et, de plus, la manutention des brames, non décrite dans le brevet, apparait très difficile.Such installations are described in patents GB 1,513,241 and FR 2,339,316. According to the second document, the product, slab for example, is placed on edge on a trolley provided with a base. The base raises the slab in the oven. Once the brane is heated, the base descends, the carriage comes under a second oven into which the base introduces the slab, and so on. Such a process has many drawbacks: it is not continuous; it requires tilting the slab, placed on the flat in the rolling mills; it does not use all the possibilities offered by induction heating; handling is very important; very hot slabs circulate in the open air and oxidize on the surface; the installation is practically not usable for slabs of very long length or comprising edges which are not strictly planar and square with the faces. According to patent GB 1,513,241, the slab being heated is laid flat on the lower inductors: we find most of the previous problems and, moreover, handling the slabs, not described in the patent, appears very difficult.

Il existe également depuis longtemps des installations de chauffage destinées aux produits longs de relativement faible section : le produit circule à travers des inducteurs successifs appartenant à des chauffeuses distinctes et il est supporté par des moyens, généralement des rouleaux, placés entre les chauffeuses.There have also long been heating installations for long products of relatively small cross section: the product circulates through successive inductors belonging to separate fireside chairs and it is supported by means, generally rollers, placed between the fireside chairs.

Cette solution n'est pas transposable aux produits de grande largeur tels que les brames. Ces produits exigent d'être supportés en des zones dont l'écartement longitudinal est faible et diminue encore au fur et à mesure de l'échauffement du métal. L'espace disponible pour les inducteurs entre deux supports successifs est faible et l'encombrement que représenteraient les rouleaux, du fait de leur nombre et de leur diamètre, augmenterait de façon démesurée la longueur du four.This solution cannot be transposed to very wide products such as slabs. These products require to be supported in areas whose spacing longitudinal is weak and decreases further as the metal heats up. The space available for the inductors between two successive supports is small and the space that the rollers would represent, because of their number and their diameter, would increase the length of the oven disproportionately.

La présente invention vise à fournir une installation à fonctionnement continu, qui évite le passage des brames très chaudes à l'air libre, est applicable même pour des largeurs très élevées et permet un support des brames à intervalles très rapprochés, facteur favorable au maintien d'une excellente rcrtilinéarité.The present invention aims to provide a continuous operation installation, which avoids the passage of very hot slabs in the open air, is applicable even for very large widths and allows support for slabs at very close intervals, a factor favorable to the maintenance of 'excellent linearity.

Dans ce but, l'invention propose notamment une installation du genre ci-dessus, caractérisée en ce que les moyens de support sont distincts des moyens de chauffage inférieurs et constituent des moyens d'avancement progressif des produits le long du tunnel.To this end, the invention provides in particular an installation of the above kind, characterized in that the support means are distinct from the lower heating means and constitute means for the progressive advancement of the products along the tunnel.

Les moyens de chauffage seront généralement des inducteurs plans polyphasés et fourniront un champ glissant. L'inducteur inférieur sera avantageusement traversé par les moyens de support et d'avancement.The heating means will generally be polyphase plane inductors and will provide a sliding field. The lower inductor will advantageously be crossed by the support and advancement means.

Les inducteurs peuvent évidemment être prévus pour dissiper dans le produit une puissance variable le long du trajet. Par exemple, il peut être souhaitable de dissiper une puissance élevée dans la partie amont du four, pour amener rapidement les produits à une température requise. Dans la partie aval, une puissance plus faible est suffisante pour maintenir cette température. Il sera généralement avantageux de fractionner le four, dans le sens de la longueur, en plusieurs sections munies de moyens de régulation de température distincts, permettant d'ajuster les puissances dissipées dans des fractions d'inducteurs occupant les sections successives. Les courbes de montée en température peuvent ainsi être adaptées aux diverses nuances de métal à traiter et créer, si besoin est, une zone finale d'homogénéisation.The inductors can obviously be provided to dissipate in the product a variable power along the path. For example, it may be desirable to dissipate a high power in the upstream part of the oven, to quickly bring the products to a required temperature. In the downstream part, a lower power is sufficient to maintain this temperature. It will generally be advantageous to split the oven, lengthwise, into several sections provided with separate temperature control means, making it possible to adjust the powers dissipated in fractions of inductors occupying the successive sections. The temperature rise curves can thus be adapted to the various shades of metal to be treated and create, if necessary, a final homogenization zone.

Les moyens de support et d'avancement peuvent notamment être constitués par un convoyeur à pas de pélerin supportant les produits par des doigts traversant celui des inducteurs qui est placé au-dessous du trajet des produits. Ces doigts sont solidaires d'un mécanisme qui, lui, est au-dessous de l'inducteur, ce qui permet de placer celui-ci à proximité immédiate du produit à chauffer.The support and advancement means may in particular be constituted by a pilgrim pitch conveyor supporting the products by fingers crossing that of the inductors which is placed below the path of the products. These fingers are integral with a mechanism which is below the inductor, which makes it possible to place the latter in the immediate vicinity of the product to be heated.

Les moyens de support et d'avancement peuvent également être constitués par des disques traversant celui des inducteurs qui est placé au-dessous du trajet des produits et calés sur des arbres situés hors du tunnel, à avancement continu ou pas à pas.The support and advancement means can also be constituted by disks crossing that of the inductors which is placed below the path of the products and wedged on shafts situated outside the tunnel, with continuous advancement or step by step.

L'invention sera mieux comprise à la lecture de la description qui suit d'une installation qui en constitue un mode particulier de réalisation donné à titre d'exemple non limitatif. La description se réfère aux dessins qui l'accompagnent, dans lesquels :

  • - la figure 1 est un schéma de principe, en coupe suivant un plan longitudinal, de l'ensemble de l'installation ;
  • - la figure 2 est une coupe schématique suivant la ligne II-II de la figure 1 ;
  • - la figure 3, similaire à la figure 2, montre une variante de réalisation.
The invention will be better understood on reading the following description of an installation which constitutes a particular embodiment given by way of non-limiting example. The description refers to the accompanying drawings, in which:
  • - Figure 1 is a block diagram, in section along a longitudinal plane, of the entire installation;
  • - Figure 2 is a schematic section along the line II-II of Figure 1;
  • - Figure 3, similar to Figure 2, shows an alternative embodiment.

Pour plus de clarté, l'échelle n'a pas été respectée sur les figures 1 à 3.For clarity, the scale has not been respected in Figures 1 to 3.

L'installation montrée schématiquement en figures 1 et 2 est destinée au traitement de brames. Le four proprement dit, dont seule une fraction est montrée sur la figure 1, est associé à une table d'alimentation 10 à longerons et une table à rouleaux de défournement 12 sur laquelle les brames sont amenées par des rouleaux pinceurs 11. Plusieurs fours peuvent évidemment être disposés côte à côté, les tables à rouleaux 12 de tous le les fours alimentant le même chariot de distribution aux laminoirs circulant sur des voies transversales au four. Dans l'installation décrite, les produits circulent dans le four dans la direction de leur grande longueur.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. In the installation described, the products circulate in the oven in the direction of their long length.

Le four 9 comporte avantageusement un tunnel enveloppe 13 destiné à limiter les pertes thermiques. La partie inférieure de l'enveloppe 13 peut constituer un platelage 14.The oven 9 advantageously comprises an envelope tunnel 13 intended to limit the heat losses. The lower part of the envelope 13 can constitute a deck 14.

L'enveloppe 13 contient deux inducteurs 16 et 17 destinés à fournir des champs électriques glissants dans le sens longitudinal du four. L'inducteur inférieur 17 est fixe et porté par le platelage 14. Il est situé au-dessous du trajet parcouru par les brames 15. Il est protégé de la chaleur rayonnée par ces brames par un garnissage isolant 18, par exemple en briques réfractaires. L'inducteur 16, qui peut être suspendu à l'enveloppe ou porté par des tirants traversant celle-ci, a une constitution similaire. Les tirants de suspension sont avantageusement portés par un mécanisme permettant de modifier la hauteur de l'inducteur 16, de façon à donner à l'entrefer entre l'inducteur 16 et le produit 15, une valeur optimale.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 plate 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.

Le four est muni de moyens de support et d'avancement des brames 15. Dans le mode de réalisation illustré en figures 1 et 2, ces moyens sont constitués par un convoyeur à pas de pélerin de constitution classique. Cé convoyeur comporte des pieds supports fixes 19 portés par le platelage 14 et répartis longitudinalement à intervalles suffisamment rapprochés pour éviter toute flexion des brames. Il comporte encore des pieds mobiles 20 fixés à un longeron 21 placé sous l'enveloppe tunnel et auquel un mécanisme, non représenté, permet d'imprimer le mouvement indiqué par la flèche f sur la figure 1 et le mouvement inverse. On voit que les pieds mobiles 20 permettent d'avancer pas à pas la brame avec un pas d'avance déterminé.The oven is provided with means for supporting and advancing the slabs 15. In the embodiment illustrated in FIGS. 1 and 2, these means are constituted by a conveyor with pilgrim steps of conventional constitution. This conveyor comprises fixed support legs 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 shell 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.

Les pieds 20 et 19 étant en contact avec les produits à haute température doivent être constitués en matériau approprié. Dans la pratique, on utilisera avantageusement des matériaux au moins en partie non magnétiques dans la portion du four où la température n'atteint pas le point de Curie. Il sera souvent commode de constituer ces pieds, dans toute la longueur du four, en matériau réfractaire au moins dans la partie en contact avec les produits 15.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, of refractory material at least in the part in contact with the products 15.

Lorsque les produits à traiter sont des produits métallurgiques courants, dont la largeur ne dépasse guère deux mètres, il suffit de deux files longitudinales. de pieds 20 écartées par exemple de un mètre. Etant donné que la résistance à la flexion et au fluage des produits métallurgiques diminue lorsque la température augmente, il sera souvent avantageux de réduire l'intervalle entre deux pieds successifs dans les zones les plus chaudes : on peut par exemple utiliser un écartement de plusieurs mètres dans la zone d'entrée du four où le métal est à température modérée, et descendre jusqu'à une valeur de l'ordre du mètre dans les zones les plus chaudes.When the products to be treated are standard metallurgical products, the width of which hardly exceeds two meters, two longitudinal rows are sufficient. 20 feet apart for example by one meter. Since the flexural and creep resistance of metallurgical products decreases as the temperature increases, it will often be advantageous to reduce the interval between two successive feet in the hottest areas: one can for example use a spacing of several meters in the entry zone of the furnace where the metal is at moderate temperature, and go down to a value of the order of a meter in the hottest zones.

En dépit du calorifugeage des inducteurs 16 et 17, il sera souvent nécessaire de les refroidir. Pour cela, on pourra par exemple munir l'inducteur supérieur 16 d'un réseau de tubes de circulation d'un réfrigérant qui pénètre à travers l'enveloppe et en sort par des conduits 22. Une aspiration pulsée pourra être prévue pour évacuer l'air chaud au-dessus de l'inducteur 17 de façon pulsée. Cette aspiration permettra en même temps d'éliminer la calamine éventuellement formée. Le tunnel enveloppe 13 sera habituellement constitué en tôle doublée intérieurement de réfractaire. Il pourra constituer une enceinte dont l'étanchéité est suffisante pour maintenir dans le four l'atmosphère de conditionnement nécessaire au traitement de certains aciers spéciaux.Despite the thermal insulation of the inductors 16 and 17, it will often be necessary to cool them. For this, we can for example provide the upper inductor 16 with a network of circulation tubes of a refrigerant which penetrates through the casing and leaves it through 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 whose sealing is sufficient to maintain in the furnace the conditioning atmosphere necessary for the treatment of certain special steels.

On peut utiliser des dispositifs de support autres que le convoyeur à pas de pélerin montré en figures 1 et 2. Dans la variante de réalisation montrée en figure 3 (où les organes correspondant a ceux des figures 1 et 2 portent le même numéro de référence affecté de l'indice a), les moyens de support sont constitués par deux files de disques 20a dont seules les parties supérieures traversent l'inducteur inférieur 17a. Les disques 20a sont calés par paire sur des arbres d'entrainement 21a placés au-dessous du tunnel et, en conséquence, sont soustraits à l'action des hautes températures qui règnent dans le four.Support devices other than the pilgrim pitch conveyor shown in FIGS. 1 and 2 can be used. In the alternative embodiment shown in FIG. 3 (where the members corresponding to those of FIGS. 1 and 2 have the same reference number assigned of index a), 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 removed from the action of the high temperatures prevailing in the oven.

Les mécanismes d'entrainement des arbres sont avantageusement prévus pour permettre de donner aux disques un mouvement de va-et-vient en cas d'arrêt du laminage conduisant à laisser séjourner les produits en place, afin d'éviter toute déformation. Les mécanismes de commande des rouleaux 20a situés dans la partie terminale du four sont, de leur côté, avantageusement prévus pour évacuer les produits, après chauffage, à vitesse élevée, ce qui permet de se dispenser des rouleaux pinceurs 11 ou des organes d'autres types nécessaires dans la plupart des cas à l'extraction.The drive mechanisms of the shafts are advantageously provided to enable the discs to move back and forth 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.

Les avantages de l'installation apparaissent immédiatement : la longueur du four est utilisée en totalité, de sorte qu'elle peut être réduite ; les produits restent en permanence à plat ; le rendement thermique peut être très élevé étant donné les possibilités de réglage qui n'existent pas dans le cas de four à induction à inducteurs annulaires ; les courbes de chauffage peuvent être parfaitement adaptées aux différentes nuances de métal à traiter.The advantages of the installation appear immediately: the length of the oven is used in full, so that it can be reduced; professionals duits 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.

A titre d'exemple, on peut indiquer qu'il suffit de trois installations du genre défini ci-dessus pour alimenter en brames de 250 x 1500 mm, de 14 m de longueur unitaire, un train de laminoirs continus à bande produisant 6 000 000 de tonnes par an. Chacune des trois installations demande une puissance installée de l'ordre de 100 MW. Pour les brames d'épaisseur courante de 250 mm environ, les inducteurs peuvent être alimentés à la fréquence du réseau.By way of example, it may be indicated that three installations of the kind defined above are sufficient to supply slabs of 250 x 1500 mm, 14 m in unit length, to a train of continuous strip mills producing 6,000,000 tonnes per year. Each of the three installations requires an installed capacity of around 100 MW. For slabs with a current thickness of approximately 250 mm, the inductors can be supplied at the network frequency.

Claims (9)

1. Installation de chauffane par induction de produits métallurgiques plats, comportant un tunnel muni de moyens de support des produits disposés à plat le long du tunnel dans le sens de leur grande longueur et des moyens de chauffage par induction électrique, placés l'un au-dessus et l'autre au-dessous des produits, caractérisée en ce que les moyens de support (20, 20a) sont distincts des moyens de chauffage inférieurs (17) et constituent des moyens d'avancement progressif des produits le long du tunnel.1. Installation of a boiler by induction of flat metallurgical products, comprising a tunnel provided with means for supporting the products arranged flat along the tunnel in the direction of their great length and means of heating by electric induction, placed one at the above and the other below the products, characterized in that the support means (20, 20a) are distinct from the lower heating means (17) and constitute means for the progressive advancement of the products along the tunnel. 2. Installation suivant la revendication 1, caractérisée en ce que les inducteurs plans sont des inducteurs polyphasés.2. Installation according to claim 1, characterized in that the planar inductors are polyphase inductors. 3. Installation suivant la revendication 1, caractérisée en ce que la hauteur de l'inducteur (16) placé au-dessus du trajet du produit est seule réglable.3. Installation according to claim 1, characterized in that the height of the inductor (16) placed above the path of the product is only adjustable. 4. Installation suivant la revendication 1, 2 ou 3, caractérisée en ce que les moyens de support ou d'avancement sont constitués par un convoyeur à pas de pélerin supportant les produits par des pieds (20) traversant l'inducteur (15) placé au-dessous du trajet des produits.4. Installation according to claim 1, 2 or 3, characterized in that the support or advancement means are constituted by a pilgrim step conveyor supporting the products by feet (20) passing through the inductor (15) placed below the product path. 5. Installation suivant la revendication 4, caractérisée en ce que les pieds sont commandés par un mécanisme (21) situé hors du tunnel.5. Installation according to claim 4, characterized in that the feet are controlled by a mechanism (21) located outside the tunnel. 6. Installation suivant la revendication 4 ou 5, caractérisée en ce que les pieds sont constitués au moins partiellement de matériau réfractaire non magnétique.6. Installation according to claim 4 or 5, characterized in that the feet consist at least partially of non-magnetic refractory material. 7. Installation suivant la revendication 1, 2 ou 3, caractérisée en ce que les moyens de support et d'avancement sont constitués par des disques traversant l'inducteur placé au-dessous du trajet des produits et calés sur des arbres d'entrainement placés au-dessous du tunnel.7. Installation according to claim 1, 2 or 3, characterized in that the support and advancement means consist of discs passing through the inductor placed below the path of the products and wedged on drive shafts placed below the tunnel. 8. Installation suivant l'une quelconque des revendications 1 à 7, caractérisée en ce que les moyens de support (20,20a) sont disposés en deux files parallèles, symétriques par rapport au plan médian du tunnel, à un écartement longitudinal plus faible dans les zones où les produits sont à température plus élevée.8. Installation according to any one of claims 1 to 7, characterized in that the support means (20,20a) are arranged in two parallel rows, symmetrical with respect to the median plane of the tunnel, at a smaller longitudinal spacing in areas where products are at higher temperatures. 9. Installation suivant l'une quelconque des revendications 1 à 8, caractérisée en ce qu'elle est fractionnée en plusieurs sections successives, munies de moyens de régulation de température distincts commandant la puissance dissipée dans des fractions d'inducteurs occupant les sections successives.9. Installation according to any one of claims 1 to 8, characterized in that it is divided into several successive sections, provided with separate temperature control means controlling the power dissipated in fractions of inductors occupying the successive sections.
EP79401023A 1978-12-22 1979-12-14 Induction heating apparatus for flat metallurgical products Expired EP0013218B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7836230 1978-12-22
FR7836230A FR2445085A1 (en) 1978-12-22 1978-12-22 INDUCTION HEATING SYSTEM FOR FLAT METALLURGICAL PRODUCTS

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EP0013218A1 true EP0013218A1 (en) 1980-07-09
EP0013218B1 EP0013218B1 (en) 1983-11-02

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US (1) US4321449A (en)
EP (1) EP0013218B1 (en)
JP (1) JPS5590097A (en)
BE (1) BE880706A (en)
DE (1) DE2966381D1 (en)
FR (1) FR2445085A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0509374A1 (en) * 1991-04-18 1992-10-21 Alltrista Corporation Method and apparatus for coating a metal substrate and for drying and curing said coating
US5230822A (en) * 1989-11-15 1993-07-27 Lever Brothers Company, Division Of Conopco, Inc. Wax-encapsulated particles

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2547402B1 (en) * 1983-06-13 1988-08-12 Cem Comp Electro Mec DEVICE FOR HEATING METAL PRODUCTS BY INDUCTION
GB8319660D0 (en) * 1983-07-21 1983-08-24 Force Eng Ltd Travelling wave induction heater
FR2568359B1 (en) * 1984-07-27 1987-01-09 Siderurgie Fse Inst Rech DEVICE FOR THE INDUCTIVE TEMPERATURE HOMOGENEIZATION OF RUNNING METAL PRODUCTS

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FR1079698A (en) * 1952-07-30 1954-12-01 Siemens Ag Device for transporting metal parts through one or more induction coils
FR1283314A (en) * 1960-12-22 1962-02-02 Acec Induction heater for forges
DE1176773B (en) * 1954-03-29 1964-08-27 Deutsche Edelstahlwerke Ag Device for conveying work-pieces through an inductor
DE1182373B (en) * 1963-05-30 1964-11-26 Siemens Ag Cross-field induction furnace
FR2002190A1 (en) * 1968-02-19 1969-10-17 United States Steel Corp
US3717740A (en) * 1971-07-09 1973-02-20 Park Ohio Industries Inc Slab heating device
FR2328170A1 (en) * 1975-10-17 1977-05-13 Aeg Elotherm Gmbh CONTINUOUS INDUCTION OVEN WITH LIFTING PARTS SUPPORT MOUNTED BACK AND BACK
FR2339316A1 (en) * 1976-01-21 1977-08-19 Siderurgie Fse Inst Rech SLIDING FIELD INDUCTION REHEATING OVEN
GB1513241A (en) * 1975-05-21 1978-06-07 Nat Res Dev Induction heaters

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DE2556057C2 (en) * 1975-12-12 1982-04-01 Sundwiger Eisenhütte Maschinenfabrik Grah & Co, 5870 Hemer Method and device for heating metal strips, in particular non-ferrous metal strips

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1079698A (en) * 1952-07-30 1954-12-01 Siemens Ag Device for transporting metal parts through one or more induction coils
DE1176773B (en) * 1954-03-29 1964-08-27 Deutsche Edelstahlwerke Ag Device for conveying work-pieces through an inductor
FR1283314A (en) * 1960-12-22 1962-02-02 Acec Induction heater for forges
DE1182373B (en) * 1963-05-30 1964-11-26 Siemens Ag Cross-field induction furnace
FR2002190A1 (en) * 1968-02-19 1969-10-17 United States Steel Corp
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
FR2328170A1 (en) * 1975-10-17 1977-05-13 Aeg Elotherm Gmbh CONTINUOUS INDUCTION OVEN WITH LIFTING PARTS SUPPORT MOUNTED BACK AND BACK
FR2339316A1 (en) * 1976-01-21 1977-08-19 Siderurgie Fse Inst Rech SLIDING FIELD INDUCTION REHEATING OVEN

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5230822A (en) * 1989-11-15 1993-07-27 Lever Brothers Company, Division Of Conopco, Inc. Wax-encapsulated particles
EP0509374A1 (en) * 1991-04-18 1992-10-21 Alltrista Corporation Method and apparatus for coating a metal substrate and for drying and curing said coating
US5321896A (en) * 1991-04-18 1994-06-21 Alltrista Corporation Apparatus for coating a metal substrate and for drying and curing said coating
US5325601A (en) * 1991-04-18 1994-07-05 Alltrista Corporation Method for drying and curing a coated metal substrate

Also Published As

Publication number Publication date
EP0013218B1 (en) 1983-11-02
FR2445085B1 (en) 1981-12-18
DE2966381D1 (en) 1983-12-08
JPS5590097A (en) 1980-07-08
JPH0127554B2 (en) 1989-05-30
BE880706A (en) 1980-06-19
US4321449A (en) 1982-03-23
FR2445085A1 (en) 1980-07-18

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