EP0546960A1 - Tubular beam particularly for forge and heat treatment furnaces - Google Patents

Tubular beam particularly for forge and heat treatment furnaces Download PDF

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Publication number
EP0546960A1
EP0546960A1 EP92420316A EP92420316A EP0546960A1 EP 0546960 A1 EP0546960 A1 EP 0546960A1 EP 92420316 A EP92420316 A EP 92420316A EP 92420316 A EP92420316 A EP 92420316A EP 0546960 A1 EP0546960 A1 EP 0546960A1
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EP
European Patent Office
Prior art keywords
chenet
section
refractory
andirons
heat treatment
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.)
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Application number
EP92420316A
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German (de)
French (fr)
Inventor
Charles Pasqualini
Bernard Louessard
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AFE Metal SAS
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AFE Metal SAS
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Publication date
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Publication of EP0546960A1 publication Critical patent/EP0546960A1/en
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/022—Skids
    • F27D3/024—Details of skids, e.g. riders
    • 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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0025—Supports; Baskets; Containers; Covers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D5/00—Supports, screens, or the like for the charge within the furnace
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • F27D1/0009—Comprising ceramic fibre elements

Definitions

  • the object of the invention is to remedy these drawbacks in a simple, safe, efficient, rational and economical manner.
  • each chenet is formed by a straight body of hollow cross section.
  • the section of the body is open, the open part constituting the base of said body.
  • Another problem which the invention proposes to solve is to ensure good stability of the chenet.
  • Another problem which the invention proposes to solve is to delay the oxidizing action of the exposed faces of the andirons.
  • fibrous and refractory materials are placed on the foundry model before the placement of the sand which will form the mold. These fibrous materials are bonded to the metal during the casting of the mold and form the desired protection.
  • the mold andirons are made from a mold executed with molding sand of low refractoriness.
  • the mold imprint undergoes a treatment capable of giving it a surface state with hollows and reliefs, to facilitate, at the time of casting, a surface sizing by residual interpenetration of the metal in the foundry sand, to generate a layer protective vitrified surface.
  • Another problem which the invention proposes to solve is to ensure resistance to creep or crushing, after an oxidative attack on the walls of the chenet, having the effect of reducing their thickness.
  • the material is globular corundum bonded with a refractory cement.
  • the body has, at its base, arrangements obtained directly by foundry and capable of acting as a support for the material.
  • Another problem which the invention proposes to solve is to ensure a metallurgical structure free from lack of compactness by the physical phenomenon of cast steels which forms, in the massive parts, shrinkage and loosening of grains from which corrosion high temperature intergranular accelerates decommissioning.
  • the body of the andirons has walls of constant thickness.
  • the body of the latter has internal vertical ribs.
  • the upper part of the ribs has a recess.
  • Another problem which the invention proposes to solve is to facilitate the handling of the andirons for their installation and their removal, either for cleaning the sole, or for their replacement.
  • the body has at its end, gripping organs of the ear type.
  • the body has very noticeably in its middle part, projecting from its lateral wings, prominences to allow gripping the chenet by pinching in case of emergency hot removal as well as in case of damage to the ears.
  • Another problem which the invention proposes to solve is to avoid any risk of slipping of the product or products placed on the andirons.
  • Figure 1 is a perspective view of the chenet according to the invention.
  • Figure 2 is a longitudinal sectional view of the chenet.
  • Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2.
  • Figure 4 is a cross-sectional view taken along line 4-4 of Figure 2.
  • FIG. 5 is a sectional view showing an example of positioning the andiron on the bottom of an oven, the andirons being lined with insulating refractory material.
  • Figure 6 is a cross-sectional view taken along line 6-6 of Figure 3.
  • the chenet is formed by a rectilinear body (1) of hollow cross section.
  • the body is obtained directly by foundry.
  • the body (1) is of open trapezoidal section, defining two inclined wings (1a) (1b) and an upper horizontal branch (1c). The ends of the body are closed.
  • the open part of the hollow section of the body forms the basis of the latter.
  • the inclination of the branches (1a) and (1b) is determined to ensure perfect stability for the whole body, the opening of the hollow trapezoidal section constituting the large base.
  • the body (1) has, in overflow from each of its ends, prominences (1d) (1e) acting as a stop for the product (s) placed on the andirons.
  • the internal section of the body (1) has vertical ribs (1f). The upper part of the ribs has a recess (1f1).
  • the internal section of the body (1) is filled with an insulating refractory material (M).
  • M insulating refractory material
  • This material is advantageously globular corundum bonded with a refractory cement, so as not to generate the mass capable of altering the energy balance.
  • the refractory material (M) can be maintained in the internal volume of the chenet by a peripheral internal return of the wall of the latter or by crosspieces (2) obtained directly by foundry with the body of the chenet.
  • the body (1) has at its end, gripping members of the ear type (1h). Likewise, the body can present very substantially in its middle part, in overflow of its lateral wings (1a) (1b), prominences (1i) to allow gripping the chenet by pinching in case of emergency hot removal as well as in case of ear damage (1h).
  • the prominences (1i) are obtained directly by molding.
  • fibrous and refractory materials are placed on the foundry model before the placement of the sand which will form the mold. These fibrous materials are bonded to the metal during the casting of the mold and form the desired protection.
  • the andirons (1) are made from a mold executed with molding sand of low refractoriness.
  • the mold imprint undergoes a treatment capable of giving it a surface state with hollows and reliefs, to facilitate, at the time of casting, a surface sizing by residual interpenetration of the metal in the foundry sand, to generate a layer protective vitrified surface.
  • the mold imprint can be scratched by a metal comb.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Abstract

The andiron is made up of a rectilinear body (1) made of refractory cast steel of hollow cross-section. <IMAGE>

Description

Il est connu d'employer notamment dans les fours de forges et fours de traitements thermiques, des chenets destinés à supporter les pièces à traiter.It is known to use in particular in forging ovens and heat treatment ovens, andirons intended to support the parts to be treated.

Dans le cas des fours de forges par exemple, les chenets sont souvent forgés par les utilisateurs dans des nuances d'acier noble, ce qui leur confère un coût très élevé. Ces nuances sont souvent mal adaptées aux hautes températures, dans des atmosphères corosives, telles qu'oxydantes. Il en résulte un nettoyage fréquent des sols de fouts pour éliminer la calamine déposée.In the case of forging ovens for example, the andirons are often forged by users in noble steel grades, which gives them a very high cost. These shades are often ill-suited to high temperatures, in corrosive atmospheres, such as oxidizing. This results in frequent cleaning of the barrel floors to remove the deposited scale.

Ces chenets sont généralement de section pleine et rectangulaire, ce qui leur donne une masse importante préjudiciable à leur coût, engendrant par ailleurs, un besoin énergétique prohébitif pour leur mise en température. En outre, cette section rectangulaire, à partir d'un certain niveau d'usure, rend les chenets sensibles aux déformations par vrillage sous l'effet des charges.These andirons are generally of full and rectangular section, which gives them a large mass detrimental to their cost, generating moreover, a prohébitive energy requirement for their setting in temperature. In addition, this rectangular section, from a certain level of wear, makes the andirons sensitive to deformation by twisting under the effect of loads.

A noter également que la configuration des chenets conduit à ce que le chauffage des pièces à forger ou à traiter thermiquement peut se trouver insuffisant à leur contact. Cela revêt d'une grande importance quant à la qualité des produits, si leur mise en température avant forgeage du traitement n'est pas rigoureusement uniforme. Par exemple, pour une action de forgeage, si la température de la pièce à traiter n'est pas homogène, le fluage sera moindre dans les zônes de plus basse température, avec pour conséquence:

  • des pertes de métal au niveau du chutage des pieds et têtes,
  • des déchirures internes,
  • une mauvaise cohésion des grains de la masse cristalline,
It should also be noted that the configuration of the andirons leads to the fact that the heating of the parts to be forged or to be heat-treated may be insufficient upon contact. This is of great importance for the quality of the products, if their temperature setting before forging the treatment is not strictly uniform. For example, for a forging action, if the temperature of the part to be treated is not homogeneous, the creep will be less in the areas of lower temperature, with the consequence:
  • metal losses in the fall of the feet and heads,
  • internal tears,
  • poor cohesion of the grains of the crystalline mass,

L'invention s'est fixée pour but de remédier à ces inconvénients, de manière simple, sûre efficace, rationnelle et économique.The object of the invention is to remedy these drawbacks in a simple, safe, efficient, rational and economical manner.

Le problème que se propose de résoudre l'invention est de concevoir des chenets :

  • dans des aciers moulés réfractaires dont le choix est adapté aux conditions d'utilisation,
  • de masses minimales pour permettre la mise en température uniforme des produits portés en demandant le minimum d'énergie pour leur propre chauffage,
  • de résistance accrue aux actions agréssives, telle que l'oxydation, par une conception composite protégeant les faces exposées des chenets, dont la résistance au fluage sous la charge reste acquise, même après un usage susceptible d'avoir entraîner une perte d'épaisseur significative.
The problem which the invention proposes to solve is to design andirons:
  • in refractory cast steels, the choice of which is adapted to the conditions of use,
  • minimum masses to allow uniform heating of the products worn while requiring the minimum of energy for their own heating,
  • increased resistance to aggressive actions, such as oxidation, by a composite design protecting the exposed faces of the andirons, whose creep resistance under load remains acquired, even after use likely to have resulted in a significant loss of thickness .

Un tel problème est résolu en ce que chaque chenet est formé par un corps rectiligne de section transversale creuse.Such a problem is solved in that each chenet is formed by a straight body of hollow cross section.

Pour résoudre le problème posé d'assurer l'allégement des chenets, tout en ayant pour objectif d'assurer une bonne stabilité des produits à traiter, la section du corps est ouverte, la partie ouverte constituant la base dudit corps.To resolve the problem posed of lightening the andirons, while having the objective of ensuring good stability of the products to be treated, the section of the body is open, the open part constituting the base of said body.

Un autre problème que se propose de résoudre l'invention est d'assurer une bonne stabilité du chenet.Another problem which the invention proposes to solve is to ensure good stability of the chenet.

Un tel problème est résolu en ce que la section du corps est trapézoïdale.Such a problem is solved in that the section of the body is trapezoidal.

Un autre problème que se propose de résoudre l'invention est de retarder l'action oxydante des faces exposées des chenets.Another problem which the invention proposes to solve is to delay the oxidizing action of the exposed faces of the andirons.

Pour résoudre un tel problème, plusieurs solutions peuvent être envisagées en ayant chacune pour objectif, que sur les faces exposées des chenets, le métal réfractaire soit protégé par des matériaux composites.To solve such a problem, several solutions can be envisaged, each having the objective that, on the exposed faces of the andirons, the refractory metal is protected by composite materials.

Dans une première forme de réalisation, des matériaux fibreux et réfractaires sont placés sur le modèle de fonderie avant la mise en place du sable qui formera le moule. Ces matériaux fibreux sont liés au métal lors de la coulée du moule et forme la protection recherchée.In a first embodiment, fibrous and refractory materials are placed on the foundry model before the placement of the sand which will form the mold. These fibrous materials are bonded to the metal during the casting of the mold and form the desired protection.

Dans une deuxième forme de réalisation, le moule les chenets sont réalisés à partir d'un moule exécuté avec du sable de moulage de faible réfractérité. L'empreinte du moule subit un traitement apte à lui conférer un état de surface avec des creux et reliefs, pour faciliter, au moment de la coulée, un grésage de surface par interpénétration rémanente du métal dans le sable de fonderie, pour générer une couche de surface vitrifiée protectrice.In a second embodiment, the mold andirons are made from a mold executed with molding sand of low refractoriness. The mold imprint undergoes a treatment capable of giving it a surface state with hollows and reliefs, to facilitate, at the time of casting, a surface sizing by residual interpenetration of the metal in the foundry sand, to generate a layer protective vitrified surface.

Dans une autre forme de réalisation, on prévoit d'appliquer dans le fond du moule, une couche réfractaire isolante formée par exemple, par un mélange de chamotte, poudre de verre avec pour support et liant, du silicate de soude.In another embodiment, provision is made to apply to the bottom of the mold, an insulating refractory layer formed for example, by a mixture of chamotte, glass powder with sodium silicate as support and binder.

Un autre problème que se propose de résoudre l'invention est d'assurer la résistance au fluage ou à l'écrasement, après une attaque oxydante des parois du chenet, ayant pour effet de réduire leur épaisseur.Another problem which the invention proposes to solve is to ensure resistance to creep or crushing, after an oxidative attack on the walls of the chenet, having the effect of reducing their thickness.

Un tel problème est résolu en ce que le volume interne du corps est rempli d'un matériau réfractaire isolant de masse volumique très réduite.Such a problem is solved in that the internal volume of the body is filled with an insulating refractory material of very low density.

Avantageusement, le matériau est du corindon globulaire lié avec un ciment réfractaire.Advantageously, the material is globular corundum bonded with a refractory cement.

Pour résoudre le problème posé d'assurer le maintien en position du matériau réfractaire isolant, le corps présente, à sa base, des agencements obtenus directement par fonderie et aptes à faire office d'appui au matériau.To resolve the problem posed of ensuring that the insulating refractory material is kept in position, the body has, at its base, arrangements obtained directly by foundry and capable of acting as a support for the material.

Un autre problème que se propose de résoudre l'invention est d'assurer une structure métallurgique exempte de manque de compacité par le phénomène physique des aciers moulés qui forme, dans les parties massives, des retassures et des desserrement de grains à partir desquels la corrosion intergranulaire à haute température accélère la mise hors d'usage.Another problem which the invention proposes to solve is to ensure a metallurgical structure free from lack of compactness by the physical phenomenon of cast steels which forms, in the massive parts, shrinkage and loosening of grains from which corrosion high temperature intergranular accelerates decommissioning.

Un tel problème est résolu en ce que le corps des chenets présente des parois d'épaisseur constante. Pour augmenter la rigidité des chenets, le corps de ces derniers présente des nervures verticales internes. La partie supérieure des nervures présente un évidement.Such a problem is solved in that the body of the andirons has walls of constant thickness. To increase the rigidity of the andirons, the body of the latter has internal vertical ribs. The upper part of the ribs has a recess.

Un autre problème que se propose de résoudre l'invention est de faciliter la manutention des chenets pour leur mise en place et leur enlèvement, soit pour le nettoyage de la sole, soit pour leur remplacement.Another problem which the invention proposes to solve is to facilitate the handling of the andirons for their installation and their removal, either for cleaning the sole, or for their replacement.

Un tel problème est résolu en ce que le corps présente à son extrémité, des organes de préhension du type oreilles. De même, le corps présente très sensiblement dans sa partie médiane, en débordement de ses ailes latérales, des prohéminences pour permettre de saisir le chenet par pincement en cas d'enlèvement d'urgence à chaud ainsi qu'en cas d'endommagement des oreilles.Such a problem is solved in that the body has at its end, gripping organs of the ear type. Likewise, the body has very noticeably in its middle part, projecting from its lateral wings, prominences to allow gripping the chenet by pinching in case of emergency hot removal as well as in case of damage to the ears.

Un autre problème que se propose de résoudre l'invention est d'éviter tout risque de glissement du ou des produits disposés sur les chenets.Another problem which the invention proposes to solve is to avoid any risk of slipping of the product or products placed on the andirons.

Un tel problème est résolu en ce que le corps présente, en débordement de chacune de ses extrémités, des prohéminences faisant office de butée.Such a problem is solved in that the body has, in overflow from each of its ends, prominences acting as a stop.

L'invention est exposée, ci-après, plus en détail à l'aide des dessins annexés, dans lesquels :The invention is set out below in more detail with the aid of the appended drawings, in which:

La figure 1 est une vue en perspective du chenet selon l'invention.Figure 1 is a perspective view of the chenet according to the invention.

La figure 2 est une vue en coupe longitudinal du chenet.Figure 2 is a longitudinal sectional view of the chenet.

La figure 3 est une vue en coupe transversale considérée selon la ligne 3-3 de la figure 2.Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2.

La figure 4 est une vue en coupe transversale considérée selon la ligne 4-4 de la figure 2.Figure 4 is a cross-sectional view taken along line 4-4 of Figure 2.

La figure 5 est une vue en coupe montrant un exemple de positionnement de chenet sur la sole d'un four, les chenets étant garnis du matériau réfractaire isolant.FIG. 5 is a sectional view showing an example of positioning the andiron on the bottom of an oven, the andirons being lined with insulating refractory material.

La figure 6 est une vue en coupe transversale considérée selon la ligne 6-6 de la figure 3.Figure 6 is a cross-sectional view taken along line 6-6 of Figure 3.

Selon l'invention, le chenet est formé par un corps rectiligne (1) de section transversale creuse. Avantageusement, le corps est obtenu directement par fonderie.According to the invention, the chenet is formed by a rectilinear body (1) of hollow cross section. Advantageously, the body is obtained directly by foundry.

Comme le montrent notamment les figures 1, 3, 4 et 5, le corps (1) est de section trapézoïdale ouverte, délimitant deux ailes inclinées (1a) (1b) et une branche horizontale supérieure (1c). Les extrémités du corps sont fermées. La partie ouverte de la section creuse du corps constitue la base de ce dernier. L'inclinaison des branches (1a) et (1b) est déterminée pour assurer une parfaite stabilité à l'ensemble du corps, l'ouverture de la section creuse trapézoïdale constituant la grande base.As shown in particular in Figures 1, 3, 4 and 5, the body (1) is of open trapezoidal section, defining two inclined wings (1a) (1b) and an upper horizontal branch (1c). The ends of the body are closed. The open part of the hollow section of the body forms the basis of the latter. The inclination of the branches (1a) and (1b) is determined to ensure perfect stability for the whole body, the opening of the hollow trapezoidal section constituting the large base.

Suivant une autre caractéristique, le corps (1) présente, en débordement de chacune de ses extrémités, des prohéminences (1d) (1e) faisant office de butée au(x) produit(s) disposés sur les chenets. De même, la section interne du corps (1) présente des nervures verticales (1f). La partie supérieure des nervures présente un évidement (1f1).According to another characteristic, the body (1) has, in overflow from each of its ends, prominences (1d) (1e) acting as a stop for the product (s) placed on the andirons. Similarly, the internal section of the body (1) has vertical ribs (1f). The upper part of the ribs has a recess (1f1).

Pour assurer la résistance au fluage ou à l'écrasement après une attaque oxydante des parois (1a) (1b) du chenet, on remplit la section interne du corps (1) d'un matériau réfractaire isolant (M). Ce matériau est avantageusement du corindon globulaire lié avec un ciment réfractaire, de manière à ne pas géner la masse susceptible d'altérer le bilan énergétique.To ensure resistance to creep or crushing after an oxidative attack on the walls (1a) (1b) of the chenet, the internal section of the body (1) is filled with an insulating refractory material (M). This material is advantageously globular corundum bonded with a refractory cement, so as not to generate the mass capable of altering the energy balance.

Le matériau réfractaire (M) peut être maintenu dans le volume interne du chenet par un retour intérieur périphérique de la paroi de ce dernier ou par des traverses (2) obtenues directement par fonderie avec le corps du chenet.The refractory material (M) can be maintained in the internal volume of the chenet by a peripheral internal return of the wall of the latter or by crosspieces (2) obtained directly by foundry with the body of the chenet.

Suivant une autre caractéristique, le corps (1) présente à son extrémité, des organes de préhension du type oreilles (1h). De même, le corps peut présenter très sensiblement dans sa partie médiane, en débordement de ses ailes latérales (1a) (1b), des prohéminences (1i) pour permettre de saisir le chenet par pincement en cas d'enlèvement d'urgence à chaud ainsi qu'en cas d'endommagement des oreilles (1h). Les prohéminences (1i) sont obtenues directement par moulage.According to another characteristic, the body (1) has at its end, gripping members of the ear type (1h). Likewise, the body can present very substantially in its middle part, in overflow of its lateral wings (1a) (1b), prominences (1i) to allow gripping the chenet by pinching in case of emergency hot removal as well as in case of ear damage (1h). The prominences (1i) are obtained directly by molding.

Pour résoudre le problème de retarder l'action oxydante des faces exposées (1a) (1b) (1c) du corps du chenet, plusieurs solutions peuvent être envisagées en ayant chacune pour objectif, que sur ces faces, le métal réfractaire soit protégé par des matériaux composites.To solve the problem of delaying the oxidizing action of the exposed faces (1a) (1b) (1c) of the body of the chenet, several solutions can be envisaged, each having the objective that, on these faces, the refractory metal is protected by composite materials.

Dans une première forme de réalisation, des matériaux fibreux et réfractaires sont placés sur le modèle de fonderie avant la mise en place du sable qui formera le moule. Ces matériaux fibreux sont liés au métal lors de la coulée du moule et forme la protection recherchée.In a first embodiment, fibrous and refractory materials are placed on the foundry model before the placement of the sand which will form the mold. These fibrous materials are bonded to the metal during the casting of the mold and form the desired protection.

Dans une deuxième forme de réalisation, les chenets (1) sont réalisés à partir d'un moule exécuté avec du sable de moulage de faible réfractérité. L'empreinte du moule subit un traitement apte à lui conférer un état de surface avec des creux et reliefs, pour faciliter, au moment de la coulée, un grésage de surface par interpénétration rémanente du métal dans le sable de fonderie, pour générer une couche de surface vitrifiée protectrice. Par exemple, l'empreinte du moule peut être griffée par un peigne métallique.In a second embodiment, the andirons (1) are made from a mold executed with molding sand of low refractoriness. The mold imprint undergoes a treatment capable of giving it a surface state with hollows and reliefs, to facilitate, at the time of casting, a surface sizing by residual interpenetration of the metal in the foundry sand, to generate a layer protective vitrified surface. For example, the mold imprint can be scratched by a metal comb.

Dans une autre forme de réalisation, on prévoit d'appliquer dans le fond du moule, une couche réfractaire isolante formée par exemple, par un mélange de chamotte, poudre de verre avec pour support et liant, du silicate de soude.In another embodiment, provision is made to apply to the bottom of the mold, an insulating refractory layer formed for example, by a mixture of chamotte, glass powder with sodium silicate as support and binder.

Les avantages ressortent bien de la description, en particulier on souligne et on rappelle :

  • diminution du poids chargé
  • gain d'énergie
  • perte de métal réduite
  • amélioration de la qualité dûe au chauffage :
    • # déchirure interne,
    • # replis de forge,
    • # cohésion au centre,
    • # brûlure des produits,
    • # diminution de la calamine.
The advantages emerge clearly from the description, in particular it is emphasized and recalled:
  • decrease in loaded weight
  • energy saving
  • reduced metal loss
  • quality improvement due to heating:
    • # internal tear,
    • # folds of forge,
    • # cohesion at the center,
    • # product burns,
    • # decrease in scale.

Claims (11)

-1- Chenet notamment pour fours de forges et fours de traitements thermiques, caractérisé en ce qu'il est formé par un corps rectiligne (1) en acier moulé réfractaire, de section transversale creuse. -1- Chenet especially for forging furnaces and heat treatment furnaces, characterized in that it is formed by a rectilinear body (1) in refractory cast steel, of hollow cross section. -2- Chenet selon la revendication 1, caractérisé en ce que la section du corps (1) est ouverte, la partie ouverte constituant la base dudit corps. -2- Chenet according to claim 1, characterized in that the section of the body (1) is open, the open part constituting the base of said body. -3- Chenet selon la revendication 2, caractérisé en ce que la section du corps (1) est trapézoïdale. -3- Chenet according to claim 2, characterized in that the section of the body (1) is trapezoidal. -4- Chenet selon la revendication 2, caractérisé en ce que la section du corps (1) est remplie d'un matériau réfractaire isolant (M), apte à assurer la résistance au fluage ou écrasement, après attaque oxydante des parois du corps. -4- Chenet according to claim 2, characterized in that the section of the body (1) is filled with an insulating refractory material (M), capable of ensuring resistance to creep or crushing, after oxidative attack on the walls of the body. -5- Chenet selon la revendication 4, caractérisé en ce que le matériau (M) est du corindon globulaire lié avec un ciment réfractaire. -5- Chenet according to claim 4, characterized in that the material (M) is globular corundum bonded with a refractory cement. -6- Chenet selon la revendication 1, caractérisé en ce que le corps (1) présente en débordement de chacune de ses extrémités, des prohéminences (1d) (1e) faisant office de butée. -6- Chenet according to claim 1, characterized in that the body (1) has an overflow from each of its ends, protrusions (1d) (1e) acting as a stop. -7- Chenet selon la revendication 1, caractérisé en ce que le corps (1) présente des nervures verticales internes (1f). -7- Chenet according to claim 1, characterized in that the body (1) has internal vertical ribs (1f). -8- Chenet selon la revendication 1, caractérisé en ce que la partie supérieure des nervures (1f) présente un évidement (1f1). -8- Chenet according to claim 1, characterized in that the upper part of the ribs (1f) has a recess (1f1). -9- Chenet selon l'une quelconque des revendications 1 et 4, caractérisé en ce que les ailes (1a) (1b) du corps (1) présentent à leur base, des agencements (2) aptes à assurer la retenue du matériau (M). -9- Chenet according to any one of claims 1 and 4, characterized in that the wings (1a) (1b) of the body (1) have at their base, arrangements (2) capable of ensuring the retention of the material ( M). -10- Chenet selon la revendication 1, caractérisé en ce que le corps (1) présente à son extrémité, des organes de préhension du type oreilles (1h) et/ou des prohéminences (1i) formées très sensiblement en débordement latérale de la partie médiane dudit corps. -10- Chenet according to claim 1, characterized in that the body (1) has at its end, gripping members of the ears type (1h) and / or prominences (1i) formed very substantially in lateral overflow of the part median of said body. -11- Chenet selon l'une quelconque des revendications 1 à 10, caractérisé en ce que sur les faces exposées des chenets, le métal réfractaire est protégé par des matériaux composites. -11- Chenet according to any one of claims 1 to 10, characterized in that on the exposed faces of the andirons, the refractory metal is protected by composite materials.
EP92420316A 1991-12-12 1992-09-16 Tubular beam particularly for forge and heat treatment furnaces Withdrawn EP0546960A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9115830 1991-12-12
FR9115830A FR2685070B1 (en) 1991-12-12 1991-12-12 CHENET ESPECIALLY FOR FORGING OVENS AND HEAT TREATMENT OVENS.

Publications (1)

Publication Number Publication Date
EP0546960A1 true EP0546960A1 (en) 1993-06-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92420316A Withdrawn EP0546960A1 (en) 1991-12-12 1992-09-16 Tubular beam particularly for forge and heat treatment furnaces

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EP (1) EP0546960A1 (en)
FR (1) FR2685070B1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB328506A (en) * 1929-07-08 1930-05-01 William Shaw Improvements in, or relating to, annealing dishes
US2073724A (en) * 1936-05-08 1937-03-16 Union Steel Casting Company Annealing base
GB1167848A (en) * 1967-08-03 1969-10-22 Huettenwerk Oberhausen Ag Improvements in or relating to Industrial Furnaces.
EP0019184A1 (en) * 1979-05-17 1980-11-26 KELLER OFENBAU GmbH Tunnel kiln truck
EP0274807A1 (en) * 1987-01-16 1988-07-20 Sumitomo Metal Industries, Ltd. Heat-resisting supporting member

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB328506A (en) * 1929-07-08 1930-05-01 William Shaw Improvements in, or relating to, annealing dishes
US2073724A (en) * 1936-05-08 1937-03-16 Union Steel Casting Company Annealing base
GB1167848A (en) * 1967-08-03 1969-10-22 Huettenwerk Oberhausen Ag Improvements in or relating to Industrial Furnaces.
EP0019184A1 (en) * 1979-05-17 1980-11-26 KELLER OFENBAU GmbH Tunnel kiln truck
EP0274807A1 (en) * 1987-01-16 1988-07-20 Sumitomo Metal Industries, Ltd. Heat-resisting supporting member

Also Published As

Publication number Publication date
FR2685070A1 (en) 1993-06-18
FR2685070B1 (en) 1994-04-01

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