EP0013218B1 - Induction heating apparatus for flat metallurgical products - Google Patents

Induction heating apparatus for flat metallurgical products Download PDF

Info

Publication number
EP0013218B1
EP0013218B1 EP79401023A EP79401023A EP0013218B1 EP 0013218 B1 EP0013218 B1 EP 0013218B1 EP 79401023 A EP79401023 A EP 79401023A EP 79401023 A EP79401023 A EP 79401023A EP 0013218 B1 EP0013218 B1 EP 0013218B1
Authority
EP
European Patent Office
Prior art keywords
products
inductor
tunnel
path
flat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP79401023A
Other languages
German (de)
French (fr)
Other versions
EP0013218A1 (en
Inventor
René Courdille
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Publication of EP0013218A1 publication Critical patent/EP0013218A1/en
Application granted granted Critical
Publication of EP0013218B1 publication Critical patent/EP0013218B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
    • H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands

Definitions

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

Description

La présente invention a pour objet une installation de chauffage par induction de produits métallurgiques suivant le préambule de la revendication 1.The subject of the present invention is an installation for the induction heating of metallurgical products according to the preamble of claim 1.

Le document DE-A-1 176 773 fait connaître un four de ce type qui comporte un inducteur en forme de bobine et des moyens de transport qui, pour ne pas traverser la bobine, comprennent au moins un cadre à deux rails s'étendant audelà des extrémités de la bobine animé d'un mouvement cyclique et coopérant avec des rails fixes ou appartenant à un second cadre.Document DE-A-1 176 773 discloses an oven of this type which includes a coil-shaped inductor and transport means which, in order not to pass through the coil, comprise at least one frame with two rails extending beyond ends of the coil driven in a cyclic movement and cooperating with fixed rails or belonging to a second frame.

Cette disposition présente de nombreuses limitations. Elle ne permet de traiter que des produits de petites dimensions, du fait que le cadre n'est supporté qu'à ses extrémités. Elle n'est applicable qu'à des produits ayant une longueur et une hauteur du même ordre, la bobine devant être à peu près circulaire pour que le champ soit homogène. Elle n'est pas adaptable à la hauteur des produits, les fractions de la bobine étant fixes les unes par rapport aux autres.This provision has many limitations. It only allows the treatment of small products, because the frame is only supported at its ends. It is only applicable to products having a length and a height of the same order, the coil having to be roughly circular for the field to be homogeneous. It is not adaptable to the height of the products, the fractions of the coil being fixed relative to each other.

Le four suivant le document FR 2 328 170 est similaire au précédent, le premier cadre ayant un mouvement de va-et-vient longitudinal et coopérant avec des tiges supports traversant la bobine et animées d'un mouvement de va-et-vient vertical. Ce four présente les mêmes inconvénients que le précédent. Au surplus, il exige deux mécanismes mobiles et les tiges supports doivent rester de petites dimensions pour ne pas créer des hétérogénéités de champ.The oven according to document FR 2 328 170 is similar to the previous one, the first frame having a longitudinal reciprocating movement and cooperating with support rods passing through the coil and driven in a vertical reciprocating movement. This oven has the same drawbacks as the previous one. In addition, it requires two mobile mechanisms and the support rods must remain small in order not to create field heterogeneities.

La présente invention vise à fournir une installation de ce type répondant mieux que celles antérieurement connues aux exigences de la pratique, notamment en ce que les inconvénients ci-dessus sont écartés et en ce que l'installation permet de traiter des produits métallurgiques plats de très grandes dimensions, tels que des brames, de façon continue.The present invention aims to provide an installation of this type that better meets those previously known to the requirements of practice, in particular in that the above drawbacks are eliminated and in that the installation makes it possible to treat flat metallurgical products of very large dimensions, such as slabs, continuously.

Ce résultat est atteint grâce aux dispositions définies dans la partie caractérisante de la revendication 1. Les avantages obtenus sont notamment les suivants: des produits très larges et très lourds peuvent être traités, du fait que les inducteurs sont plats et horizontaux, parallèles aux grandes faces des produits. Les produits reposent par gravité sur les supports à une distance de l'inducteur inférieur qui est constante et peut être choisie à la valeur optimale. Les deux inducteurs étant indépendants, leur distance peut être ajustée à l'épaisseur de la pièce et celle-ci peut être très inférieure à la largeur. Les moyens de transport peuvent traverser l'inducteur inférieur sans difficultés, les bobinages présentant des parties longues parallèles à la longueur du four, c'est-à-dire au sens du déplacement.This result is achieved thanks to the provisions defined in the characterizing part of claim 1. The advantages obtained are in particular the following: very wide and very heavy products can be treated, because the inductors are flat and horizontal, parallel to the large faces some products. The products rest by gravity on the supports at a distance from the lower inductor which is constant and can be chosen at the optimum value. The two inductors being independent, their distance can be adjusted to the thickness of the part and it can be much less than the width. The means of transport can pass through the lower inductor without difficulty, the windings having long parts parallel to the length of the oven, that is to say in the direction of movement.

Il a déjà été proposé des inducteurs plats, mais pour traiter des pièces sur chant (FR-A 2 339 316) ou en posant le produit sur l'inducteur inférieur après avoir soulevé l'inducteur supérieur (brevet GB 1 513 241). Jamais l'homme du métier n'a envisagé de déplacer sur plat des produits métallurgiques de grande largeur, tels que des brames, vraisemblablement du fait qu'il lui semblait impossible de le faire par suite de l'importance des masses à soulever et déplacer à partir de moyens traversant longitudinalement le four et de la nécessité de points d'appui rapprochés pour les produits, sauf dans les zones où ils sont très chauds et donc présentent une failbe résistance à la flexion.Flat inductors have already been proposed, but for treating parts on edge (FR-A 2 339 316) or by placing the product on the lower inductor after having raised the upper inductor (GB patent 1,513,241). The skilled person has never considered moving large metallurgical products, such as slabs, on a dish, probably because he thought it impossible to do so because of the importance of the masses to be lifted and moved. from means passing longitudinally through the oven and the need for close points of support for the products, except in areas where they are very hot and therefore have a low resistance to bending.

L'inventeur a conçu une disposition permettant de surmonter ce que l'homme du métier semblait considérer comme une impossibilité, puisque la technique en était restée à un art antérieur représenté par des documents très anciens, tels que DE-A 1 176 773 remontant à 1954. Au surplus, cette approche a impliqué que l'inventeur apprécie les avantages qu'apporterait le déplacement des produits métallurgiques plats de grands taille dans un four à induction en continu de dimensions adaptées à celles des produits en maintenant ces derniers à plat.The inventor has devised a provision which overcomes what the person skilled in the art seemed to regard as an impossibility, since the technique had remained in a prior art represented by very old documents, such as DE-A 1 176 773 dating back to 1954. Furthermore, this approach implied that the inventor appreciated the advantages of moving large flat metallurgical products in a continuous induction furnace of dimensions adapted to those of the products by keeping the latter flat.

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 décrité, 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 great 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 losses thermal. 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 audessous 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 platform 14. It is located below the path traveled by the slabs 15. It is protected from the heat radiated by these slabs by an insulating lining 18, for example made of refractory bricks. The inductor 16, which can be suspended from the envelope or carried by tie rods passing through it, has a similar constitution. The suspension tie rods are advantageously carried by a mechanism making it possible to modify the height of the inductor 16, so as to give the air gap between the inductor 16 and the product 15, an optimal value.

Le four est muni de moyens de supportât d'avancement des brames 15. Dans le mode de réalisation illustré en figures 1 et 2, ces moyens sont constituès par un convoyeur à pas de pélerin de constitution classique. Ce 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 the advancement of the slabs 15. In the embodiment illustrated in FIGS. 1 and 2, these means are constituted by a pilgrim-type conveyor of conventional constitution. This conveyor comprises fixed support feet 19 carried by the platform 14 and distributed longitudinally at sufficiently close intervals to avoid any bending of the slabs. It also has movable feet 20 fixed to a spar 21 placed under the tunnel envelope and to which a mechanism, not shown, allows the movement indicated by the arrow f in FIG. 1 to be imparted and the reverse movement. It can be seen that the movable feet 20 make it possible to advance the slab step by step with a determined advance step.

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 1 5.The feet 20 and 19 being in contact with the products at high temperature must be made of suitable material. In practice, materials at least partially non-magnetic will advantageously be used in the portion of the oven where the temperature does not reach the Curie point. It will often be convenient to constitute these feet, throughout the length of the furnace, in refractory material at least in the part in contact with the products 1 5.

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. Etane 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 mères 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. Etane given that the resistance to bending and to creep of metallurgical products decreases when the temperature increases, it will often be advantageous to reduce the interval between two successive feet in the hottest zones: one can for example use a spacing of several mothers 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'étanchété 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, it will be possible for example to provide the upper inductor 16 with a network of circulation tubes of a refrigerant which penetrates through the casing and leaves it by conduits 22. A pulsed suction may be provided to evacuate the hot air above the inductor 17 in a pulsed manner. This suction will at the same time eliminate any scale that may have formed. The envelope tunnel 13 will usually be made of sheet metal internally lined with refractory. It could constitute an enclosure the sealing of which is sufficient to maintain in the oven the conditioning atmosphere necessary for the treatment of certain special steels.

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 à ceux des figures 1 et 2 portent le même numéro de référence affecté de l'indice a), les moyens de support sont constituès 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'entraînement 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 shielded from the action of the high temperatures prevailing in the oven.

Les mécanismes d'entraînement 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 make it possible to give the discs a back-and-forth movement in the event of the rolling stop leading to the products remaining in place, in order to avoid any deformation. The control mechanisms of the rollers 20a situated in the terminal part of the oven are, for their part, advantageously provided for discharging the products, after heating, at high speed, which makes it possible to dispense with the pinch rollers 11 or organs of other types necessary in most cases for extraction.

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; the products remain permanently flat; the thermal efficiency can be very high given the adjustment possibilities which do not exist in the case of induction furnace with annular inductors; the heating curves can be perfectly adapted to the different shades of metal to be treated.

A titre d'exemple, on peut indiquer qu'il suffit de trois installations du genre défini ci-dessus pour alimenter en brames de 250x 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 can be indicated that three installations of the kind defined above are sufficient to supply slabs of 250 × 1500 mm, 14 m in unit length, to a train of continuous strip rolling 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. Apparatus for induction heating of metallurgical products, comprising a tunnel provided with means for induction heating of the products located along the tunnel and means for progressively advancing the products along the tunnel and for supporting said products independently of the heating means, characterized in that the heating means comprise a flat inductor (16) located above the path of the products and a flat inductor (17) located under the path and traversed by the movable elements (20 or 20a) of the advance means for longitudinally moving the products and provided for wide metallurgical products (15), such as slabs, to rest flat of the advance means.
2. Apparatus according to claim 1, characterized in that the flat inductors are polyphase inductors.
3. Apparatus according to claim 1, characterized in that only the level of that inductor (16) which is located above the path of the product is adjustable.
4. Apparatus according to claim 1, 2 or 3, characterized in that the support or advance means consist of a pelgrim step conveyor having feet (20) supporting the products and passing through the inductor (15) located under the path of the products.
5. Apparatus according to claim 4, characterized in that the feet are actuated by a mechanism located out of the tunnel.
6. Apparatus according to claim 4 or 5, characterized in that the feet at least partially consist of non magnetic refractory material.
7. Apparatus according to claim 1, 2 or 3, characterized in that the support and advance means consist of disks projecting through that inductor which is located under the path of the products and carried by drive shafts located under the tunnel.
8. Apparatus according to any one of claims 1-7, characterized in that the support means (20, 20a) are disposed in two parallel rows, symetrical with respect to the median plane of the tunnel and have a spacing which is smaller in the zones where the products are at the highest temperature.
9. Apparatus according to any one of claims 1-8, characterized in that it is fractionated into several successive sections, provided with separate temperature regulating means which control the power dissipated in inductor sections in 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

Publications (2)

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

Family

ID=9216483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79401023A Expired EP0013218B1 (en) 1978-12-22 1979-12-14 Induction heating apparatus for flat metallurgical products

Country Status (6)

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

Families Citing this family (5)

* 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
US5230822A (en) * 1989-11-15 1993-07-27 Lever Brothers Company, Division Of Conopco, Inc. Wax-encapsulated particles
DE69224544T2 (en) * 1991-04-18 1998-10-15 Alltrista Corp Method and device for drying and curing a coating of a metallic substrate

Family Cites Families (10)

* 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
US3471673A (en) * 1968-02-19 1969-10-07 United States Steel Corp Apparatus for inductively heating a traveling metal slab
US3717740A (en) * 1971-07-09 1973-02-20 Park Ohio Industries Inc Slab heating device
GB1513241A (en) * 1975-05-21 1978-06-07 Nat Res Dev Induction heaters
DE2546563C3 (en) * 1975-10-17 1979-11-29 Aeg-Elotherm Gmbh, 5630 Remscheid Induction conveyor furnace
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
FR2339316A1 (en) * 1976-01-21 1977-08-19 Siderurgie Fse Inst Rech SLIDING FIELD INDUCTION REHEATING OVEN

Also Published As

Publication number Publication date
FR2445085B1 (en) 1981-12-18
DE2966381D1 (en) 1983-12-08
EP0013218A1 (en) 1980-07-09
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

Similar Documents

Publication Publication Date Title
KR102237726B1 (en) Maglev heating of metals with controlled surface quality
EP1148762B1 (en) Induction heating device having transverse flux and variable width inductor
EP0013218B1 (en) Induction heating apparatus for flat metallurgical products
EP2556317B1 (en) Method and device for treatment of continuous or discrete metal products
US4490922A (en) Apparatus for drying and calcinating coated welding electrodes with the use of induction heating
JP2011075132A (en) Continuous baking furnace for solar battery
EP0170585B1 (en) Temperature-homogenizing device for continuously moving metallic products
US4427371A (en) Pusher furnace with soak zone lifter
JPH04147596A (en) Induction heating of metallic thin plate
US2276471A (en) Method of conveying and treating metallic sheets
FR2887707A1 (en) DEVICE AND METHOD FOR GUIDING A METAL STRIP IN CONTINUOUS PROCESS EQUIPMENT
KR101435056B1 (en) Heating apparatus of material
EP0686209B1 (en) Process and system for the continuous treatment of a galvanized steel strip
JP7253558B2 (en) Hot rolling in-line moving thermal insulation heat treatment process and heat treatment line
EP0044787A1 (en) Furnace with interchangeable heating walls for the heat treatment of glass sheets
BE891760A (en) OVEN FOR HEATING BRAMES, BILLETS AND FLANS
JPS6092428A (en) Apparatus for induction-heating metallic strip
EP0129160B1 (en) Continuous-induction-heating arrangement for metallic products
US5245148A (en) Apparatus for and method of heating thick metal slabs
JPH02112816A (en) Air cooler for hot rolled wire rod
KR200181435Y1 (en) A bottom heat cover structure for delay table of hot mill line
JP4391867B2 (en) Induction heating device
FR2495752A1 (en) Induction furnace, esp. for heating long steel slab - using upper and lower row of induction heating modules sepd. by rollers on which slab rests
FR2701493A1 (en) Plant for pickling a metal strip
JPH0474840B2 (en)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE GB NL SE

17P Request for examination filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): DE GB NL SE

REF Corresponds to:

Ref document number: 2966381

Country of ref document: DE

Date of ref document: 19831208

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19841217

Year of fee payment: 6

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19841231

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19851215

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19860701

GBPC Gb: european patent ceased through non-payment of renewal fee
NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19881118

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19910218

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19920901

EUG Se: european patent has lapsed

Ref document number: 79401023.1

Effective date: 19860902