EP0935004A1 - Improved annealing device for sheet metal - Google Patents

Improved annealing device for sheet metal Download PDF

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Publication number
EP0935004A1
EP0935004A1 EP99400142A EP99400142A EP0935004A1 EP 0935004 A1 EP0935004 A1 EP 0935004A1 EP 99400142 A EP99400142 A EP 99400142A EP 99400142 A EP99400142 A EP 99400142A EP 0935004 A1 EP0935004 A1 EP 0935004A1
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EP
European Patent Office
Prior art keywords
strip
rollers
formats
heating elements
heating
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.)
Granted
Application number
EP99400142A
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German (de)
French (fr)
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EP0935004B1 (en
Inventor
Rummeng Song
Patrick Dubois
Michel Boyer
Françoise Onno
Charlie Lespagnol
Akli Elias
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.)
Sollac SA
Fives Stein SA
Original Assignee
Stein Heurtey SA
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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Application filed by Stein Heurtey SA, Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Stein Heurtey SA
Publication of EP0935004A1 publication Critical patent/EP0935004A1/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/573—Continuous furnaces for strip or wire with cooling
    • C21D9/5735—Details
    • C21D9/5737—Rolls; Drums; Roll arrangements

Definitions

  • the present invention relates to improvements made to furnaces cooling implemented in thermal treatment installations strip metal products, in particular in annealing furnace systems or continuous galvanizing through which the strip to be treated is conveyed by through rollers.
  • the technical problem which the present invention proposes to solve is that the elimination of this risk of folds forming in the new strip, during the change of tape format, in such cooling chambers strip products.
  • rollers such as 14 have a homogeneous temperature when changing band formats.
  • it either cool the central part of the roll across the width of the strip, which is extremely difficult to achieve, either heating the parts of the roll outside the bandwidth.
  • the invention proposes to provide a simple, effective and inexpensive solution to the problem mentioned above of the formation of folds when changing formats of bands.
  • the invention relates to a device making it possible to avoid the risk of formation of folds on a strip conveyed in a cooling oven of a continuous heat treatment installation, in particular an annealing or galvanizing, through which the strip is conveyed by rollers, these being heated by contact with the strip across its width, the risk of formation of folds occurring when changing band formats, when the next strip is wider, this then passing on rollers having retained the imprint of thermal expansion due to the previous strip, this device being characterized in that one positions: heating elements close rolls, and below them, over the entire width of the oven and, on the side of the rollers opposite said heating elements, aligned panels of so as to form with the wall of the oven, a warm chamber, the moving band continuous serving as a heat shield so that only the part of the roll not covered by the strip is heated by said heating elements.
  • said elements heaters are made in the form of electric candles.
  • the heating of the rollers, by said elements heating can be carried out continuously or discontinuously depending on the frequency of changing band formats, said heating elements operating continuously during frequent format and format changes discontinuously during infrequent format changes, heating being used for a fixed period, immediately before the change of formats.
  • the operation of said heating elements is controlled by a real-time calculator.
  • FIG. 4 represents a cooling oven to which applied the present invention.
  • the device which is the subject of the invention therefore comprises heating elements such as 18 which are positioned near the rollers 14 as seen in Figure 4, in below these, over the entire width of the oven, these heating elements 18 can be made in the form of electric candles for example.
  • the device further includes panels such as 20 which are aligned on the side of the rollers 14, opposite the heating elements 18, these panels being designed and arranged so as to form a warm chamber with the wall of the oven in order to increase heating efficiency.
  • the panels 20 can be produced, inter alia, in ceramic fibers taken between stainless sheets.
  • the heating system such as 18 of the rollers 14 can be controlled by a real-time computer.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Coating With Molten Metal (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Tunnel Furnaces (AREA)

Abstract

A device that allows the avoidance of the formation of wrinkles on strip passing through a cooling furnace in a thermal treatment installation is characterised in that the device is positioned with some heating elements (18) close to the rollers (14) over the width of the furnace (10) and, on the side of the rollers opposite these heating elements, some panels (20) aligned to form with the furnace wall, a tepid chamber, the strip (12) in continuous displacement acting as a thermal screen in a manner such that only the part of the roller not covered by the strip may be heated by the heating elements.

Description

La présente invention concerne des perfectionnements apportés à des fours de refroidissement mis en oeuvre dans des installations de traitement thermique de produits métalliques en bande, notamment dans des systèmes de fours de recuit ou de galvanisation en continu au travers desquels la bande à traiter est véhiculée par l'intermédiaire de rouleaux.The present invention relates to improvements made to furnaces cooling implemented in thermal treatment installations strip metal products, in particular in annealing furnace systems or continuous galvanizing through which the strip to be treated is conveyed by through rollers.

Sur la figure 1 des dessins annexés, on a représenté, de façon très schématique, un four de refroidissement désigné dans son ensemble par la référence 10 au travers duquel la bande 12 circule en continu en passant sur des rouleaux tels que 14.In Figure 1 of the accompanying drawings, there is shown, very schematically, a cooling furnace designated as a whole by the reference 10 through from which the strip 12 circulates continuously by passing over rollers such as 14.

Dans l'enceinte du four de refroidissement 10, il existe une différence de température entre la bande 12, qui est chaude, et les rouleaux 14. Lorsque la bande 12 passe sur les rouleaux 14, elle chauffe ceux-ci, par contact, dans une zone qui correspond à la largeur de la bande. On peut à cet égard se reporter à la figure 2 des dessins annexés qui représente en perspective l'enroulement de la bande 12 sur un rouleau 14.In the enclosure of the cooling oven 10, there is a difference in temperature between the strip 12, which is hot, and the rollers 14. When the strip 12 passes over the rollers 14, it heats them, by contact, in a area that corresponds to the width of the strip. In this regard, we can refer to the Figure 2 of the accompanying drawings which shows in perspective the winding of the strip 12 on a roll 14.

La répartition de températures selon l' axe longitudinal du rouleau prend alors la forme d'un chapeau melon. Sur la figure 3a des dessins annexés, on a représenté la variation de température du rouleau le long de son axe longitudinal. Il résulte d'une telle répartition de température que la table du rouleau prend également une forme en chapeau melon sous l'effet de la dilatation thermique. Sur la figure 3b des dessins annexés, on a représenté la variation du diamètre du rouleau sous l'effet de cette dilatation thermique (avec amplification pour mieux faire ressortir ce phénomène) le long de l'axe longitudinal du rouleau.The temperature distribution along the longitudinal axis of the roller then takes the shaped like a bowler hat. In Figure 3a of the accompanying drawings, there is shown the temperature variation of the roller along its longitudinal axis. It results from such temperature distribution that the roller table also takes shape in a bowler hat under the effect of thermal expansion. In Figure 3b attached drawings, the variation in the diameter of the roller has been shown under the effect of this thermal expansion (with amplification to better highlight this phenomenon) along the longitudinal axis of the roller.

Lorsque l'on procède à un changement de format de la bande 12, et si la bande suivante présente une largeur plus importante, elle passe alors sur des rouleaux 14 qui ont conservé « l'empreinte » de la dilatation thermique due à la bande précédente et il existe alors un risque de formation de plis dans la nouvelle bande.When changing the format of the tape 12, and if the tape next has a larger width, it then passes on rollers 14 who have retained the "imprint" of thermal expansion due to the strip previous and there is then a risk of creases in the new strip.

Le problème technique que se propose de résoudre la présente invention est celui de la suppression de ce risque de formation de plis dans la nouvelle bande, lors du changement de format de bande, dans de telles enceintes de refroidissement de produits en bande.The technical problem which the present invention proposes to solve is that the elimination of this risk of folds forming in the new strip, during the change of tape format, in such cooling chambers strip products.

Le risque de formation de plis disparaít si les rouleaux tels que 14 présentent une température homogène lors des changements de formats de bandes. Pour obtenir une température homogène sur les rouleaux 14 de l'enceinte de refroidissement, il faut soit refroidir la partie centrale du rouleau dans la largeur de la bande, ce qui est extrêmement difficile à réaliser, soit chauffer les parties du rouleau en dehors de la largeur de bande.The risk of folds disappears if the rollers such as 14 have a homogeneous temperature when changing band formats. To get a uniform temperature on the rollers 14 of the cooling enclosure, it either cool the central part of the roll across the width of the strip, which is extremely difficult to achieve, either heating the parts of the roll outside the bandwidth.

Afin de diminuer le risque de formation de plis de bandes durant le changement de formats, on utilise à l'heure actuelle, notamment les techniques suivantes :

  • ralentissement du défilement de la bande pendant le changement de formats : cette technique présente l'inconvénient d'impliquer une perte de production en raison de ce ralentissement;
  • chauffage des rouleaux à l'intérieur de ceux-ci, notamment par une résistance électrique interne: il en résulte en général une fabrication des rouleaux complexe et coûteuse et cette technique n'est utilisable que pour quelques formats de bandes ; par ailleurs, cette technique nécessite une très grande stabilité de la position de la bande sur les rouleaux.
In order to reduce the risk of formation of folds of bands during the change of formats, the following techniques are currently used:
  • slower running of the tape during the change of formats: this technique has the disadvantage of involving a loss of production due to this slowing;
  • heating the rollers inside them, in particular by an internal electrical resistance: this generally results in a complex and costly manufacture of the rollers and this technique can only be used for a few strip formats; moreover, this technique requires very great stability of the position of the strip on the rollers.

L'invention se propose d'apporter une solution simple, efficace et peu coûteuse au problème évoqué ci-dessus de la formation de plis lors du changement de formats de bandes. The invention proposes to provide a simple, effective and inexpensive solution to the problem mentioned above of the formation of folds when changing formats of bands.

En conséquence, l'invention concerne un dispositif permettant d'éviter le risque de formation de plis sur une bande véhiculée dans un four de refroidissement d'une installation de traitement thermique en continu, notamment un four de recuit ou de galvanisation, au-travers duquel la bande est véhiculée par des rouleaux, ceux-ci étant chauffés par contact avec la bande dans la largeur de celle-ci, le risque de formation de plis se présentant lors d'un changement de formats de bandes, lorsque la bande suivante est plus large, celle-ci passant alors sur des rouleaux ayant conservé l'empreinte de la dilatation thermique due à la bande précédente, ce dispositif étant caractérisé en ce que l'on positionne : des éléments chauffants près des rouleaux, et en dessous de ces derniers, sur toute la largeur du four et, sur le côté des rouleaux opposé auxdits éléments chauffants, des panneaux alignés de manière à former avec la paroi du four, une chambre tiède, la bande en déplacement continu servant d'écran thermique de manière que seule la partie du rouleau non recouverte par la bande soit chauffée par lesdits éléments chauffants.Consequently, the invention relates to a device making it possible to avoid the risk of formation of folds on a strip conveyed in a cooling oven of a continuous heat treatment installation, in particular an annealing or galvanizing, through which the strip is conveyed by rollers, these being heated by contact with the strip across its width, the risk of formation of folds occurring when changing band formats, when the next strip is wider, this then passing on rollers having retained the imprint of thermal expansion due to the previous strip, this device being characterized in that one positions: heating elements close rolls, and below them, over the entire width of the oven and, on the side of the rollers opposite said heating elements, aligned panels of so as to form with the wall of the oven, a warm chamber, the moving band continuous serving as a heat shield so that only the part of the roll not covered by the strip is heated by said heating elements.

Selon un mode de réalisation préféré de la présente invention, lesdits éléments chauffants sont réalisés sous la forme de bougies électriques.According to a preferred embodiment of the present invention, said elements heaters are made in the form of electric candles.

Selon la présente invention, le chauffage des rouleaux, par lesdits éléments chauffants peut être réalisé de façon continue ou discontinue en fonction de la fréquence de changement de formats de bande, lesdits éléments chauffants fonctionnant de façon continue lors de changements fréquents de formats et de façon discontinue lors de changements peu fréquents de formats, le chauffage étant utilisé pendant une durée déterminée, immédiatement avant le changement de formats.According to the present invention, the heating of the rollers, by said elements heating can be carried out continuously or discontinuously depending on the frequency of changing band formats, said heating elements operating continuously during frequent format and format changes discontinuously during infrequent format changes, heating being used for a fixed period, immediately before the change of formats.

Selon la présente invention le fonctionnement desdits éléments chauffants est piloté par un calculateur en temps réel.According to the present invention the operation of said heating elements is controlled by a real-time calculator.

D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-après en référence aux dessins annexés qui en illustrent un exemple de réalisation dépourvu de tout caractère limitatif. Other characteristics and advantages of the present invention will emerge from the description given below with reference to the accompanying drawings which illustrate one exemplary embodiment devoid of any limiting character.

Sur les dessins :

  • La figure 1 est une vue schématique d'une enceinte de refroidissement à laquelle s'applique la présente invention ;
  • La figure 2 est une vue partielle en perspective représentant l'enroulement de la bande à traiter sur un rouleau, cette figure ayant été utilisée dans le préambule de la présente description afin d'expliquer les motifs du risque de formation de plis de bande;
  • La figure 3a représente la répartition de la température le long de l'axe longitudinal des rouleaux;
  • La figure 3b représente la variation du diamètre du rouleau sous l'effet de la dilatation thermique (avec amplification) le long de l'axe longitudinal de ce rouleau, ces figures 3a et 3b ayant été commentées dans le préambule de la présente description et,
  • La figure 4 est une vue partielle schématique représentant le dispositif objet de l'invention.
In the drawings:
  • Figure 1 is a schematic view of a cooling enclosure to which the present invention applies;
  • FIG. 2 is a partial perspective view showing the winding of the strip to be treated on a roll, this figure having been used in the preamble to the present description in order to explain the reasons for the risk of the formation of folds in the strip;
  • Figure 3a shows the temperature distribution along the longitudinal axis of the rollers;
  • FIG. 3b represents the variation in the diameter of the roller under the effect of thermal expansion (with amplification) along the longitudinal axis of this roller, these FIGS. 3a and 3b having been commented on in the preamble to this description and,
  • Figure 4 is a partial schematic view showing the device object of the invention.

On se réfère à la figure 4 qui représente un four de refroidissement auquel est appliquée la présente invention.Reference is made to FIG. 4 which represents a cooling oven to which applied the present invention.

Sur cette figure 4 on voit la bande 12 qui circule en continu dans l'enceinte du four 10 en passant sur les rouleaux tels que 14. La référence 16 désigne la sole du four. Le principe essentiel à la base de l'invention consiste à utiliser la bande 12 comme écran thermique et à chauffer uniquement la partie des rouleaux 14 qui n' est pas recouverte par cette bande.In this figure 4 we see the strip 12 which circulates continuously in the oven enclosure 10 passing over the rollers such as 14. The reference 16 designates the bottom of the oven. The essential principle underlying the invention consists in using the strip 12 as heat shield and to heat only the part of the rollers 14 which is not covered by this strip.

Le dispositif objet de l'invention comporte donc des éléments chauffants tels que 18 qui sont positionnés à proximité des rouleaux 14 comme on le voit sur la figure 4, en dessous de ces derniers, sur toute la largeur du four, ces éléments chauffants 18 pouvant être réalisés sous la forme de bougies électriques par exemple. Le dispositif comporte en outre des panneaux tels que 20 qui sont alignés du côté des rouleaux 14, opposé aux éléments chauffants 18, ces panneaux étant conçus et disposés de manière à former avec la paroi du four une chambre tiède afin d'augmenter l'efficacité du chauffage.The device which is the subject of the invention therefore comprises heating elements such as 18 which are positioned near the rollers 14 as seen in Figure 4, in below these, over the entire width of the oven, these heating elements 18 can be made in the form of electric candles for example. The device further includes panels such as 20 which are aligned on the side of the rollers 14, opposite the heating elements 18, these panels being designed and arranged so as to form a warm chamber with the wall of the oven in order to increase heating efficiency.

Selon la présente invention, les panneaux 20 peuvent être réalisés, entre autres, en fibres céramiques prises entre des tôles inoxydables.According to the present invention, the panels 20 can be produced, inter alia, in ceramic fibers taken between stainless sheets.

Selon la présente invention, la mise en oeuvre du chauffage des rouleaux 14 décrit ci-dessus peut être continue ou discontinue en fonction de la fréquence des changements de format. Ainsi, deux cas peuvent se présenter :

  • Premier cas : changements fréquents de formats de bande : utilisation en continu du chauffage ;
  • Deuxième cas : changements peu fréquents de formats de bande : le chauffage est utilisé pendant une durée déterminée, immédiatement avant le changement de format.
    • According to the present invention, the implementation of the heating of the rollers 14 described above can be continuous or discontinuous depending on the frequency of format changes. Thus, two cases can arise:
  • First case : frequent changes of tape formats: continuous use of heating;
  • Second case : infrequent changes of tape formats: heating is used for a fixed period, immediately before the format change.

    • Selon la présente invention, le système de chauffage tel que 18 des rouleaux 14 peut être piloté par un calculateur en temps réel.According to the present invention, the heating system such as 18 of the rollers 14 can be controlled by a real-time computer.

    On remarquera, que le chauffage de la bande telle que 12 dans un four de refroidissement diminue la capacité de refroidissement du four. Cependant, cette diminution est insignifiante et elle ne nuit en aucun cas à l'efficacité du dispositif objet de la présente invention.It will be noted that the heating of the strip such as 12 in an oven of cooling decreases the cooling capacity of the oven. However, this reduction is insignificant and in no way detracts from the effectiveness of the device object of the present invention.

    Il demeure bien entendu que la présente invention n'est pas limitée aux exemples de réalisation décrits et/ou représentés mais qu'elle en englobe toutes les variantes qui entrent dans le cadre de la portée des revendications annexéesIt remains to be understood that the present invention is not limited to the examples of realization described and / or represented but that it includes all the variants which fall within the scope of the appended claims

    Claims (7)

    Dispositif permettant d'éviter le risque de formation de plis sur une bande véhiculée dans un four de refroidissement d'une installation de traitement thermique en continu, notamment un four de recuit ou de galvanisation, au-travers duquel la bande est véhiculée par des rouleaux, ceux-ci étant chauffés par contact avec la bande dans la largeur de celle-ci, le risque de formation de plis se présentant lors d'un changement de formats de bandes, lorsque la bande suivante est plus large, celle-ci passant alors sur des rouleaux ayant conservé l'empreinte de la dilatation thermique due à la bande précédente, ce dispositif étant caractérisé en ce que l'on positionne : des éléments chauffants (18) près des rouleaux (14), et en dessous de ces derniers, sur toute la largeur du four (10) et, sur le côté des rouleaux opposé auxdits éléments chauffants, des panneaux (20) alignés de manière à former avec la paroi du four, une chambre tiède, la bande (12) en déplacement continu servant d'écran thermique de manière que seule la partie du rouleau non recouverte par la bande soit chauffée par lesdits éléments chauffants.Device to avoid the risk of folds forming on a strip conveyed in a cooling furnace of a thermal treatment installation continuously, in particular an annealing or galvanizing oven, through which the strip is conveyed by rollers, these being heated by contact with the strip across its width, the risk of wrinkles occurring during a change of band formats, when the next band is wider, this then passing on rollers having retained the imprint of the expansion thermal due to the previous strip, this device being characterized in that one positions: heating elements (18) near the rollers (14), and below these over the entire width of the oven (10) and on the opposite side of the rollers to said heating elements, panels (20) aligned so as to form with the wall of the oven, a warm chamber, the continuously moving strip (12) serving heat shield so that only the part of the roll not covered by the strip is heated by said heating elements. Dispositif selon la revendication 1 caractérisé en ce que lesdits éléments chauffants (18) sont réalisés sous la forme de bougies électriques.Device according to claim 1 characterized in that said elements heaters (18) are made in the form of electric candles. Dispositif selon l'une des revendications 1 ou 2 caractérisé en ce que le chauffage des rouleaux, par lesdits éléments chauffants (18) est continu ou discontinu en fonction de la fréquence de changement de formats de bande.Device according to one of claims 1 or 2 characterized in that the heating of the rollers by said heating elements (18) is continuous or discontinuous depending on the frequency of changing tape formats. Dispositif selon la revendication 3 caractérisé en ce que lesdits éléments chauffants (18) fonctionnent de façon continue lors de changements fréquents de formats.Device according to claim 3 characterized in that said elements heaters (18) operate continuously during frequent changes of formats. Dispositif selon la revendication 3 caractérisé en ce que lesdits éléments chauffants (18) fonctionnent de façon discontinue lors de changements peu fréquents de formats le chauffage étant utilisé pendant une durée déterminée, immédiatement avant le changement de formats de bande. Device according to claim 3 characterized in that said elements heaters (18) operate discontinuously at low changes frequent formats the heating being used for a fixed period, immediately before changing tape formats. Dispositif selon l'une quelconque des revendications précédentes caractérisé en ce que le fonctionnement desdits éléments chauffants (18) est piloté par un calculateur en temps réel.Device according to any one of the preceding claims, characterized in that the operation of said heating elements (18) is controlled by a calculator in real time. Dispositif selon l'une quelconque des revendications précédentes caractérisé en ce que lesdits panneaux (20) sont réalisés en fibres céramiques prises entre des tôles inoxydables.Device according to any one of the preceding claims, characterized in that said panels (20) are made of ceramic fibers taken between stainless sheets.
    EP99400142A 1998-02-09 1999-01-21 Improved annealing device for sheet metal Expired - Lifetime EP0935004B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9801497 1998-02-09
    FR9801497A FR2774700B1 (en) 1998-02-09 1998-02-09 IMPROVEMENTS TO COOLING OVENS FOR STRIP PRODUCTS

    Publications (2)

    Publication Number Publication Date
    EP0935004A1 true EP0935004A1 (en) 1999-08-11
    EP0935004B1 EP0935004B1 (en) 2003-09-03

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    EP99400142A Expired - Lifetime EP0935004B1 (en) 1998-02-09 1999-01-21 Improved annealing device for sheet metal

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    US (1) US6023048A (en)
    EP (1) EP0935004B1 (en)
    JP (1) JP3274843B2 (en)
    DE (2) DE935004T1 (en)
    ES (1) ES2138579T3 (en)
    FR (1) FR2774700B1 (en)

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    Title
    PATENT ABSTRACTS OF JAPAN vol. 012, no. 139 (C - 491) 27 April 1988 (1988-04-27) *
    PATENT ABSTRACTS OF JAPAN vol. 015, no. 043 (C - 0801) 31 January 1991 (1991-01-31) *
    PATENT ABSTRACTS OF JAPAN vol. 096, no. 005 31 May 1996 (1996-05-31) *

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    ES2138579T3 (en) 2004-03-16
    US6023048A (en) 2000-02-08
    FR2774700A1 (en) 1999-08-13
    ES2138579T1 (en) 2000-01-16
    FR2774700B1 (en) 2000-04-07
    DE69910854D1 (en) 2003-10-09
    DE69910854T2 (en) 2004-07-15
    EP0935004B1 (en) 2003-09-03
    DE935004T1 (en) 2000-03-02
    JPH11315331A (en) 1999-11-16
    JP3274843B2 (en) 2002-04-15

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