FR2487491A1 - Vacuum furnace for continuous heat treatment of metals - esp. for hardening saw blades made of high speed steel - Google Patents
Vacuum furnace for continuous heat treatment of metals - esp. for hardening saw blades made of high speed steel Download PDFInfo
- Publication number
- FR2487491A1 FR2487491A1 FR8016445A FR8016445A FR2487491A1 FR 2487491 A1 FR2487491 A1 FR 2487491A1 FR 8016445 A FR8016445 A FR 8016445A FR 8016445 A FR8016445 A FR 8016445A FR 2487491 A1 FR2487491 A1 FR 2487491A1
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- France
- Prior art keywords
- muffle
- oven
- airlock
- exit
- enclosure
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Classifications
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
- F27B9/028—Multi-chamber type furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
- F27B9/042—Vacuum furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/26—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on or in trucks, sleds, or containers
- F27B9/262—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace on or in trucks, sleds, or containers on or in trucks
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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
- 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
- F27D5/00—Supports, screens, or the like for the charge within the furnace
- F27D5/005—Supports specially adapted for holding elongated articles in an upright position, e.g. sparking plugs
-
- 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
- F27D1/18—Door frames; Doors, lids, removable covers
- F27D1/1858—Doors
- F27D2001/1891—Doors for separating two chambers in 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
- F27D2003/0059—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising tracks, e.g. rails and wagon
- F27D2003/006—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising tracks, e.g. rails and wagon with a return track
-
- 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
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0073—Seals
- F27D2099/0078—Means to minimize the leakage of the furnace atmosphere during charging or discharging
- F27D2099/008—Using an air-lock
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2001/00—Composition, conformation or state of the charge
- F27M2001/15—Composition, conformation or state of the charge characterised by the form of the articles
- F27M2001/1539—Metallic articles
- F27M2001/156—Flat articles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
Description
La présente invention concerne un four à passage sous vide pour le traitement thermique ou thermochimique en continu de métaux. The present invention relates to a vacuum passage furnace for continuous thermal or thermochemical treatment of metals.
Elle a plus particulièrement pour objet, mais non exclusivementwun four destiné à la trempe en continu, de pièces en acier rapide telles que des lames de scie à métaux. It has more particularly, but not exclusively, a furnace intended for the continuous quenching, of high-speed steel parts such as hacksaw blades.
D'une manière générale, on sait que le traitement de trempe consiste à soumettre le métal à un cycle thermique comprenant successivement
- un chauffage au cour duquel on élève le métal à une température de l'ordre de 1 200 C et un maintien à cette température, et
- un refroidissement suivant un mode convenable de la température de trempe à une température plus basse pouvant être différente de la température ambiante.Generally, it is known that the quenching treatment consists in subjecting the metal to a thermal cycle comprising successively
a heating during which the metal is raised to a temperature of the order of 1,200 ° C. and maintenance at this temperature, and
cooling in a suitable mode from the quenching temperature to a lower temperature which may be different from the ambient temperature.
A l'heure actuelle, le milieu de chauffage utiHsé pour effectuer la trempe de pièces telles que des lames de scie b métaux, consiste en des bains de sels fondus. At present, the heating medium used to quench parts such as metal saw blades, consists of molten salt baths.
Cette solution qui permet d'obtenir des bons résultats présente cependant un certain nombre d'inconvénients
- Les bains de sel réagissent avec le métal et sont souvent supercarburants,
- Ils sont le siège de dégagements gazeux très toxiques (scianates) et sont donc excessivement polluants.This solution which makes it possible to obtain good results has however a certain number of drawbacks
- Salt baths react with metal and are often superfuel,
- They are the seat of very toxic gas emissions (scianates) and are therefore excessively polluting.
En outre cette technique est coûteuse en énergie. In addition, this technique is costly in energy.
Ltinvention a donc pour but de supprimer ces incon- vénients. Elle propose à cet effet un four de traitement thermique à passage sous vide, dans lequel le chauffage s'effectue par rayonnement au moyen de résistances électriques. The purpose of the invention is therefore to eliminate these drawbacks. To this end, it offers a vacuum treatment heat treatment oven, in which the heating is carried out by radiation by means of electrical resistors.
D'une façon plus précise,ce four comprend essentiellement
- une enceinte à l'intérieur de laquelle on peut réaliser un vide relatif et qui communique à l'extérieur grâce à un sas d'entrée et un sas de sortie.More specifically, this oven essentially comprises
- an enclosure inside which a relative vacuum can be produced and which communicates outside thanks to an entry airlock and an exit airlock.
- un moufle calorifuge , de forme tubulaire, stéten- dant à l'intérieur de l'enceinte entre le sas d'entrée et le sas de sortie, ce moufle comprenant, dans sa partie inférieure, une ouverture longitudinale s s'étendant d'une extrémité à l'autre, et, à l'intérieur, de part et d'autre de ladite ouverture, deux séries respectives d'éléments de chauffage, ce moufle étant en outre équipé, à chacune de ses extrémités, de cloisons mobiles calorifuges commandant son accès et sa sortie. a heat-insulating muffle, tubular in shape, inside the enclosure between the entry airlock and the exit airlock, this muffle comprising, in its lower part, a longitudinal opening extending from one end to the other, and, inside, on either side of said opening, two respective series of heating elements, this muffle being additionally equipped, at each of its ends, with mobile insulating partitions controlling its entry and exit.
- des éléments de support de charges, mobiles le long d'un chemin de transfert disposé dans la partie inférieure de ltenceinte, auwdessous de l'ouverture longitudinale du moufle , et qui comprennent chacun, dans leur partie supérieure, un socle en matière réfractaire, équipé de moyens de support et/ou de fixation des pièces à traiter, et dont la forme et les dimensions sont prévues de manière à ce qu'ils puissent réaliser, par leur juxtaposition, une sole venant obturer, de façon étanche à la chaleur, l'ou- verture longitudinale du moufle. load bearing elements, movable along a transfer path arranged in the lower part of the enclosure, below the longitudinal opening of the muffle, and which each comprise, in their upper part, a base of refractory material, equipped with means of support and / or fixing of the parts to be treated, and the shape and dimensions of which are provided so that they can produce, by their juxtaposition, a sole closing off, in a heat-tight manner, the longitudinal opening of the muffle.
Selon une autre caractéristique de l'invention, le susdit sas de sortie est équipé d'un dispositif permettant de réaliser une phase de refroidissement par exemple celle d'un traitement de trempe. Par ailleurs, le susdit moufle peut en outre comprendre au moins une cloison mobile calorifuge, divisant son volume interne en deux chambres, dont lune sert au préchauffage des pièces et l'autre sert à les porter à la température de traitement (température de trempe). According to another characteristic of the invention, the above-mentioned outlet airlock is equipped with a device making it possible to carry out a cooling phase, for example that of a quenching treatment. Furthermore, the abovementioned muffle may also comprise at least one mobile heat-insulating partition, dividing its internal volume into two chambers, one of which is used for preheating the parts and the other used for bringing them to the processing temperature (quenching temperature) .
Bien entendu, le four précédemment décrit peut comprendre, à l'extérieur, un dispositif effectuant le transfert des éléments de support de charge de la sortie du four jusqu'à son entrée. Of course, the oven described above may include, outside, a device for transferring the load support elements from the outlet of the oven to its inlet.
Selon une autre caractéristique de l'invention, dans le cas du traitement thermique ou thermochimique de lames de scie à métaux, on dispose ces lames en paquets dans lesquels nulles sont superposées en configuration tête boche entre deux plaquettes de support telles que deux plats métalliques, de longueur supérieure à la longueur desdites lames, de manière à ce qu'elles dépassent d'un côté du paquet. According to another characteristic of the invention, in the case of heat or thermochemical treatment of hacksaw blades, these blades are placed in packages in which none are superimposed in head-to-head configuration between two support plates such as two metal dishes, of length greater than the length of said blades, so that they project from one side of the package.
Pour solidariser les éléments constituant ces paquets, on peut avantageusement utiliser les perçages qui sont habituellement ménagés à chacune des extrémités des lames. Dans ce cas, on prévoit sur les deux plaquettes de support des perçages correspondants et on effectue la liaison par exemple au moyen d'une ligature à l'aide de fils métalliques. To secure the elements constituting these packages, one can advantageously use the holes which are usually formed at each end of the blades. In this case, corresponding holes are provided on the two support plates and the connection is made, for example by means of a ligature using metal wires.
Les extrémités des plaquettes de support dépassant des piquets sont desti * s à venir se piquer dans les logements ménagés dans la face supérieure du socle des susdits éléments de support. Il est à noter que dans le cas ou le susdit socle est réalisé en graphite , les susdits logements peuvent être équipés de manchons en coranique. The ends of the support plates protruding from the stakes are intended to be pricked in the housings formed in the upper face of the base of the above support elements. It should be noted that in the case where the aforementioned base is made of graphite, the aforesaid housings can be equipped with sleeves in Koranic.
Un mode de réalisation de l'invention sera décrit ci-après, à titre d'exemple non limitatif, avec référence aux dessins annexés dans lesquels
La figure 1 est une coupe horizontale schématique d'un four de trempe pour lames de scie, avec son système de transfert extérieur
La figure 2 est une coupe verticale schématique, à plus grande échelle du four représenté figure 1
Les figures 3 et 4 représentent en coupe verticale transversale (figure 3) et en coupe verticale longitudinale (figure 4) la partie supérieure d'un socle dans lequel sont piqués des paquets de lames de scie
La figure 5 est une vue de dessus de la face sup4- rieure du socle représenté figures 3 et 4.An embodiment of the invention will be described below, by way of non-limiting example, with reference to the accompanying drawings in which
Figure 1 is a schematic horizontal section of a quenching furnace for saw blades, with its external transfer system
Figure 2 is a schematic vertical section, on a larger scale of the oven shown in Figure 1
Figures 3 and 4 show in vertical cross section (Figure 3) and in vertical longitudinal section (Figure 4) the upper part of a base in which are stuck bundles of saw blades
FIG. 5 is a top view of the upper face of the base shown in FIGS. 3 and 4.
Avec référence aux figures 1 et 2, le four de trempe comprend une enceinte extérieuw tubulaire 1 sensiblement cylindrique portée par une structure 2,et dont ltentrée et la sortie sont commandées par deux sas 4 respectifs équipés de moyens de pompage de manière à ce que l'on puisse réaliser, à l'intérieur de l'enceinte 1, un vide relatif tout en pouvant charger et décharger le four.A ltintérieur de cette enceinte 1, qui peut comprendre, comme représenté, une double paroi 1', 1 n avec circulation d'eau intermédiaire, est disposé un moufle tubulaire 5 en un matériau réfractait tel que des fibres de céramique, qui présente une section en forme de U inversé, avec de légers retours 6 au niveau des extrémités libres des branches du U, qui délimitent une ouverture longitudinale 7 s'étendant d'une extrémité à 1 autre du moufle 5. With reference to FIGS. 1 and 2, the quenching furnace comprises a substantially cylindrical tubular external enclosure 1 carried by a structure 2, and the inlet and outlet of which are controlled by two respective airlocks 4 equipped with pumping means so that the 'we can achieve, inside the enclosure 1, a relative vacuum while being able to load and unload the oven. Inside this enclosure 1, which may include, as shown, a double wall 1', 1 n with intermediate water circulation, a tubular block 5 is placed in a refracted material such as ceramic fibers, which has an inverted U-shaped section, with slight returns 6 at the free ends of the branches of the U, which delimit a longitudinal opening 7 extending from one end to another of the muffle 5.
Ce moufle 5 est équipé à chacune de ses extrémités ainsi que dans une région intermédiaire, deúne cloison transversale mobile 8, 9, 10 en un matériau réfractaire. This muffle 5 is equipped at each of its ends as well as in an intermediate region, with a movable transverse partition 8, 9, 10 made of a refractory material.
Par ailleurs, de part et d'autre de la fente longitudinale 7, et à l'intérieur du moufle 5sont disposées deux séries respectives de résistances électriques de chauffage 11, 11 par exemple en graphite. Furthermore, on either side of the longitudinal slot 7, and inside the muffle 5 are arranged two respective series of electrical heating resistors 11, 11 for example made of graphite.
Les cloisons 8, 9, 10 délimitent donc à l'intérieur du moufle 5 deux chambres thermiquement isolées, à savoir une chambre de préchauffage 13, située du caté du sas accès 3 et une chambre de chauffage 14 dans laquelle les pièces sont portées à la température de trempe, du côté du sas de sortie 4. The partitions 8, 9, 10 therefore delimit, inside the muffle 5, two thermally insulated chambers, namely a preheating chamber 13, located in the chamber of the airlock access 3 and a heating chamber 14 in which the parts are brought to the quenching temperature, on the outlet side 4.
L'enceinte 1 porte dans sa partie inférieure, en dessous de l'évidement longitudinal 7 du moufle 5, un chemin de transfert 15 sur lequel viennent rouler les éléments de support 16 des pièces. The enclosure 1 carries in its lower part, below the longitudinal recess 7 of the muffle 5, a transfer path 15 on which the support elements 16 of the parts roll.
Ces éléments de support 16 comprennent plus particulièrement, dans leur partie inférieure une structure de chariot 17 munie de roues 18 ou de galets, et dans leur partie supérieure, un socle 19 par exemple en graphite destiné à recevoir les lames de scie 20 à traiter. Ces socles 19 comprennent deux bordures latérales présentant un profil de forme complémentaire à celui des parois de ltouverture longitudinale 7 du moufle 5, au travers duquel ils pénètrent. Disposés bout à bout, ils constituent donc la sole du four et permettent ainsi d' isolerthermiquement le volume intérieur du moufle 5 du milieu extérieur (à l'intérieur de l'enceinte 1). These support elements 16 more particularly comprise, in their lower part a carriage structure 17 provided with wheels 18 or rollers, and in their upper part, a base 19 for example made of graphite intended to receive the saw blades 20 to be treated. These bases 19 comprise two lateral edges having a profile of shape complementary to that of the walls of the longitudinal opening 7 of the block 5, through which they penetrate. Arranged end to end, they therefore constitute the bottom of the oven and thus make it possible to thermally isolate the internal volume of the muffle 5 from the external environment (inside the enclosure 1).
Une telle disposition présente deux avantages essentiels consistant en ce que
- les organes de roulage des éléments de support 16 se trouvent situés dans une partie froide du four (à 1'extérinr du moufle 5)et peuvent être réalisés à l'aide de matériaux traditionnels peu coûteux.Such a provision has two essential advantages, namely that
- The rolling members of the support elements 16 are located in a cold part of the oven (outside the muffle 5) and can be produced using inexpensive traditional materials.
Les déperditions thermiques sont réduites au minimum du fait que les éléments de chauffage 11, 11 n'ont à chauffer que les pièces à traiter et que par ailleurs le volume interne du moufle peut être réduit au strict minimum, compte tenu des dimensions des pièces à traiter. The heat losses are reduced to a minimum because the heating elements 11, 11 only have to heat the parts to be treated and that moreover the internal volume of the muffle can be reduced to the strict minimum, taking into account the dimensions of the parts to be treat.
Avec référence aux figures 3, 4 et 5, les socles 19 comprennent, débouchant sur leur face supérieure, deux séries de logements 22 munis de manchons en céramique 23, dans lesquels viennent se piquer les paquets de lames de scie 20. With reference to FIGS. 3, 4 and 5, the bases 19 comprise, opening onto their upper face, two series of housings 22 provided with ceramic sleeves 23, in which the packets of saw blades 20 are pricked.
Ces paquets sont réalisés par un empilage de lames de scie 20 en configuration tête boche réalisé entre deux plats métalliques 23, 24 et qui présentent une partie 25 dépassant d'un caté dudit empilage. Ces plats 23, 24 comprennent chacun deux perçages correspondant aux perçages des lames de scie 20 de manière à solidariser le paquet par exemple au moyen de ligatures 26 passant au travers des perçages des plats 23, 24 et des lames de scie 20. These packages are produced by a stack of saw blades 20 in bump head configuration made between two metal plates 23, 24 and which have a portion 25 projecting from a side of said stack. These plates 23, 24 each comprise two holes corresponding to the holes in the saw blades 20 so as to secure the package for example by means of ligatures 26 passing through the holes in the dishes 23, 24 and saw blades 20.
Une fois réalisés, ces paquets peuvent venir se piquer comme représenté figures 3 et 4 par les parties 25 des plats 23, 24 dans les manchons 23 dont sont équipés les logements 22. Once produced, these packages can be pricked as shown in FIGS. 3 and 4 by the parts 25 of the dishes 23, 24 in the sleeves 23 with which the housings 22 are fitted.
Le sas 4 de sortie du four est équipé pour effectuer une phase de refroidissement en milieu gazeux et comporte à cet effet un échangeur et un bloc-turbine extérieur non représentés. The airlock 4 of the furnace outlet is equipped to perform a cooling phase in a gaseous medium and for this purpose comprises an exchanger and an external turbine block, not shown.
Par ailleurs, afin de permettre un fonctionnement continu du four, on prévoit un système de transfert extérieur comprenant
- un poste de stockage 27, 28, de stockage des éléments de support 16 disposés a' l'entrée et à la sortie du four, par exemple d'une capacité de six éléments de transport,et
- un dispositif 29 permettant le transfert du poste de stockage 28 disposé à la sortie du four à celui 27 disposé à l'entrée du four.Furthermore, in order to allow continuous operation of the oven, an external transfer system is provided comprising
a storage station 27, 28 for storing the support elements 16 arranged at the inlet and at the outlet of the oven, for example with a capacity of six transport elements, and
- A device 29 allowing the transfer of the storage station 28 disposed at the outlet of the oven to that 27 disposed at the inlet of the oven.
Le fonctionnement de ltensemble précédemment décrit s'établit comme suit
En régime permanent, le four contient six éléments de support 16 munis de leurs paquets de lames de scie 20, a' savoir
- deux éléments de support respectivement disposés dans les sas d'entrée 3 3 et de sortie 4,
- trois éléments de support 16 dans la chambre de préchauffage 13, et
- un élément de support 16 dans la chambre de chauffage 14.The operation of the previously described assembly is established as follows
In steady state, the oven contains six support elements 16 provided with their packages of saw blades 20, namely
- two support elements respectively arranged in the entry airlock 3 3 and exit 4,
three support elements 16 in the preheating chamber 13, and
- a support element 16 in the heating chamber 14.
Le transfert des éléments de support 16 à l'intérieur du four s'effectue par stades successifs, au cours desquels chaque élément de support 16 vient occuper la place de celui qui le précède. La période entre chacun de ces stades de transfert correspond à une unité de traitement. The transfer of the support elements 16 inside the oven takes place in successive stages, during which each support element 16 takes the place of the one preceding it. The period between each of these transfer stages corresponds to one processing unit.
En conséquence, chaque élément de support 16 restera pendant la durée de trois unités de traitement dans la chambre de préchauffage 13 et au maximum pendant une durée de une unité de traitement dans la chambre de chauffage 14 et dans le sas de sorte 4 où s'effectue la phase de refroidissement (les durées de chauffage et de refroidissement pouvant autre raccourcies). Consequently, each support element 16 will remain for the duration of three treatment units in the preheating chamber 13 and at most for a duration of one treatment unit in the heating chamber 14 and in the airlock so that 4 where s' performs the cooling phase (the heating and cooling times may be shortened).
On notera en outre que les opérations de chargement du sas d'entrée 3 et de déchargement du sas de sortie 4 doivent être décalées par rapport au transfert de l'ensemble des charges contenues dans le four de manière à permettre avant le déchargement du sas d'entrée 3 3 et le chargement du sas de sortie 4, de recréer à l'intérieur de ces deux sas un vide suffisant (purge). It will also be noted that the operations of loading the entry airlock 3 and unloading the exit airlock 4 must be offset with respect to the transfer of all the charges contained in the oven so as to allow before the unloading of the airlock d 'inlet 3 3 and the loading of the exit airlock 4, to recreate inside these two airlocks a sufficient vacuum (purge).
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8016445A FR2487491A1 (en) | 1980-07-25 | 1980-07-25 | Vacuum furnace for continuous heat treatment of metals - esp. for hardening saw blades made of high speed steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8016445A FR2487491A1 (en) | 1980-07-25 | 1980-07-25 | Vacuum furnace for continuous heat treatment of metals - esp. for hardening saw blades made of high speed steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2487491A1 true FR2487491A1 (en) | 1982-01-29 |
Family
ID=9244547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8016445A Pending FR2487491A1 (en) | 1980-07-25 | 1980-07-25 | Vacuum furnace for continuous heat treatment of metals - esp. for hardening saw blades made of high speed steel |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2487491A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990012266A1 (en) * | 1989-04-10 | 1990-10-18 | Cambridge Vacuum Engineering Ltd. | Vacuum furnace |
| EP0422353A2 (en) * | 1989-10-12 | 1991-04-17 | Ipsen Industries International Gesellschaft Mit Beschränkter Haftung | Furnace for the partial thermic treatment of tools |
| CN103421935A (en) * | 2012-05-30 | 2013-12-04 | 上海理工大学 | Continuous tempering treatment device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1131132B (en) * | 1960-12-01 | 1962-06-07 | Ludwig Riedhammer G M B H Indu | Tunnel furnace in gas-tight design for firing electro-ceramic materials in a protective gas atmosphere |
| FR1566165A (en) * | 1966-07-13 | 1969-05-09 | ||
| DE2112507B2 (en) * | 1971-03-16 | 1972-09-14 | Bosch Gmbh Robert | COMBUSTION CAPSULES FOR SPARK PLUG STONES |
| FR2206841A5 (en) * | 1972-11-09 | 1974-06-07 | Vaw Ver Aluminium Werke Ag | |
| DE2346909A1 (en) * | 1973-09-18 | 1975-03-27 | Werner Herdieckerhoff Gluehtop | Pusher furnace for heat treating workpieces - has overhead runway shielded from direct heat and continuous through all sections |
| US4047886A (en) * | 1975-11-24 | 1977-09-13 | Commissariat A L'energie Atomique | Furnace for the continuous sintering of pellets of ceramic nuclear fuel material |
| GB2026663A (en) * | 1978-07-26 | 1980-02-06 | Hayes Inc C | Continuous Heat Treating Vacuum Furnace |
-
1980
- 1980-07-25 FR FR8016445A patent/FR2487491A1/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1131132B (en) * | 1960-12-01 | 1962-06-07 | Ludwig Riedhammer G M B H Indu | Tunnel furnace in gas-tight design for firing electro-ceramic materials in a protective gas atmosphere |
| FR1566165A (en) * | 1966-07-13 | 1969-05-09 | ||
| DE2112507B2 (en) * | 1971-03-16 | 1972-09-14 | Bosch Gmbh Robert | COMBUSTION CAPSULES FOR SPARK PLUG STONES |
| FR2206841A5 (en) * | 1972-11-09 | 1974-06-07 | Vaw Ver Aluminium Werke Ag | |
| DE2346909A1 (en) * | 1973-09-18 | 1975-03-27 | Werner Herdieckerhoff Gluehtop | Pusher furnace for heat treating workpieces - has overhead runway shielded from direct heat and continuous through all sections |
| US4047886A (en) * | 1975-11-24 | 1977-09-13 | Commissariat A L'energie Atomique | Furnace for the continuous sintering of pellets of ceramic nuclear fuel material |
| GB2026663A (en) * | 1978-07-26 | 1980-02-06 | Hayes Inc C | Continuous Heat Treating Vacuum Furnace |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990012266A1 (en) * | 1989-04-10 | 1990-10-18 | Cambridge Vacuum Engineering Ltd. | Vacuum furnace |
| EP0422353A2 (en) * | 1989-10-12 | 1991-04-17 | Ipsen Industries International Gesellschaft Mit Beschränkter Haftung | Furnace for the partial thermic treatment of tools |
| EP0422353A3 (en) * | 1989-10-12 | 1991-07-17 | Ipsen Industries International Gesellschaft Mit Beschraenkter Haftung | Furnace for the partial thermic treatment of tools |
| CN103421935A (en) * | 2012-05-30 | 2013-12-04 | 上海理工大学 | Continuous tempering treatment device |
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