EP0376832A1 - Automatic thermal treatment installations - Google Patents

Automatic thermal treatment installations Download PDF

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Publication number
EP0376832A1
EP0376832A1 EP89403635A EP89403635A EP0376832A1 EP 0376832 A1 EP0376832 A1 EP 0376832A1 EP 89403635 A EP89403635 A EP 89403635A EP 89403635 A EP89403635 A EP 89403635A EP 0376832 A1 EP0376832 A1 EP 0376832A1
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EP
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Prior art keywords
treatment
temperature
parts
heating
order
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EP89403635A
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German (de)
French (fr)
Inventor
Olivier Schwebel
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Fives Stein SA
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Stein Heurtey SA
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Publication of EP0376832A1 publication Critical patent/EP0376832A1/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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • 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

Definitions

  • the present invention relates to a system for heat treatment of parts of any shape, preferably parts for the mechanical industry such as in particular parts for the automotive industry.
  • French patent 86 01 913 filed on February 12, 1986 and published under the number 2,594,102 by the present holder describes an installation for thermochemical treatment of parts in particular for the mechanical industry, which is characterized in that it includes an airlock. transfer of parts under a controlled atmosphere, a plurality of parts processing modules such as in particular preheating modules, thermochemical treatment modules, quenching modules, all these modules being connected to the transfer airlock, a loading airlock, an unloading airlock and a parts handling robot placed in the transfer airlock to ensure successive transfers of the parts to be treated to the different modules.
  • parts processing modules such as in particular preheating modules, thermochemical treatment modules, quenching modules, all these modules being connected to the transfer airlock, a loading airlock, an unloading airlock and a parts handling robot placed in the transfer airlock to ensure successive transfers of the parts to be treated to the different modules.
  • French patent 87 13 217 filed on September 24, 1987 by the present holder also describes an automatic installation of fast thermochemical treatment of a load made up of parts intended in particular for the mechanical industry, which includes a plurality of treatment modules such as in particular induction preheating module, thermochemical treatment modules, quenching module, a means for loading and unloading of the pieces stacked in columns and a means for transferring said columns of pieces between the different treatment modules.
  • a plurality of treatment modules such as in particular induction preheating module, thermochemical treatment modules, quenching module, a means for loading and unloading of the pieces stacked in columns and a means for transferring said columns of pieces between the different treatment modules.
  • the present invention proposes to apply the installations described above to treatments of parts in particular of mechanical parts, with a view to obtaining the results mentioned above, these treatments being characterized by the following operations: heating , temperature maintenance and controlled cooling.
  • This treatment may include degassing. Indeed, even if the surface of the product is free of deposits, it may contain adsorbed gaseous species and by raising the temperature, placing under vacuum and maintaining under vacuum for a sufficient time, it is possible to significantly reduce the content. of these gaseous species in the product finally obtained;
  • Degreasing can also be carried out, which can be carried out by means of rapid heating under a gaseous stream of hydrogen and water vapor.
  • the treatments concerning the maintenance of the surface finish of the treated parts may include other operations such as blueing, etc.
  • the invention therefore proposes to carry out operations which make it possible to avoid these drawbacks in order to maintain the dimensional stability of the parts treated.
  • These treatments can be as follows: - homogenization annealing at a temperature below the temperature at which the ferrite completes to transform into austenite during heating, and maintenance at this temperature - stress relief annealing performed by maintaining at a temperature of the order of 650 ° C. for a period of one hour relaxation annealing carried out by heating to a temperature of the order of 100 to 200 ° C. with maintenance at this temperature then slow cooling and - Stabilization annealing carried out by heating to a temperature at which the austenite begins to form, for example at around 200 ° C., this heating being followed by rapid cooling.
  • This treatment essentially involves a softening annealing.
  • the different types of treatment which have just been mentioned in order to maintain the quality of the products which are to be or have undergone heat treatment essentially comprise three types of operation: heating, temperature maintenance and controlled cooling, which, according to the invention, are carried out on an installation of the type described in the patent applications cited above.
  • the heating necessary for annealing or tempering can be carried out in the induction heating chambers provided in these installations or in one or more treatment chambers in the case of specific temperature cycles.
  • thermochemical treatment chambers Keeping at temperature can be performed according to the cycles concerned, either: - in the induction heating chamber - in the thermochemical treatment chambers if the maintenance takes place at a temperature at which the ferrite is transformed into austenite during heating - in rooms with suitable temperature, when the temperature is maintained at a temperature different from that indicated above.
  • the cooling can be carried out either in the quenching chamber, or by convection, by radiation alone or using a neutral gas at a suitable temperature or by any other suitable means.
  • thermochemical treatment When the treatment is preliminary or consecutive to the thermochemical treatment, it can be carried out directly and automatically in the installation without it being necessary to carry out a removal of the parts from the latter.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Furnace Details (AREA)

Abstract

Automatic automated installation for processing parts, designed in particular for the engineering industry where processing modules are being used, for example preheating modules, thermochemical processing modules and hardening modules. Said installation is used in heating, temperature-holding and controlled-cooling processes in order to preserve or improve surface condition, dimensional stability and metallurgical structure as well as the mechanical properties of the processed parts.

Description

La présente invention est relative à un système de traitement thermique de pièces de forme quelconque, de préférence des pièces pour l'industrie mécanique telles que notamment des pièces pour l'industrie automobile.The present invention relates to a system for heat treatment of parts of any shape, preferably parts for the mechanical industry such as in particular parts for the automotive industry.

Le brevet français 86 01 913 déposé le 12 Février 1986 et publié sous le numéro 2 594 102 par la présente titulaire décrit une installation de traitement thermochimique de pièces notamment pour l'industrie mécanique, qui est caractérisée en ce qu'elle comporte un sas de transfert des pièces sous atmosphère contrôlée, uné pluralité de modules de traitement de pièces tels que notamment modules de préchauffage, modules de traitement thermochimique, modules de trempe, tous ces modules étant connectés au sas de transfert, un sas de chargement, un sas de déchargement et un robot de manipulation des pièces disposé dans le sas de transfert pour assurer les transferts successifs des pièces à traiter aux différents modules.French patent 86 01 913 filed on February 12, 1986 and published under the number 2,594,102 by the present holder describes an installation for thermochemical treatment of parts in particular for the mechanical industry, which is characterized in that it includes an airlock. transfer of parts under a controlled atmosphere, a plurality of parts processing modules such as in particular preheating modules, thermochemical treatment modules, quenching modules, all these modules being connected to the transfer airlock, a loading airlock, an unloading airlock and a parts handling robot placed in the transfer airlock to ensure successive transfers of the parts to be treated to the different modules.

Le brevet français 87 13 217 déposé le 24 Septembre 1987 par la présente titulaire décrit également une installation automatique de traitement thermochimique rapide d'une charge constituée de pièces destinées notamment à l'industrie mécanique, qui comprend une pluralité de modules de traitement tels que notamment module de préchauffage par induction, modules de traitement thermochimique, module de trempe, un moyen pour effectuer le chargement et le déchargement des pièces empilées en colonnes et un moyen de transfert desdites colonnes de pièces entre les différents modules de traitement.French patent 87 13 217 filed on September 24, 1987 by the present holder also describes an automatic installation of fast thermochemical treatment of a load made up of parts intended in particular for the mechanical industry, which includes a plurality of treatment modules such as in particular induction preheating module, thermochemical treatment modules, quenching module, a means for loading and unloading of the pieces stacked in columns and a means for transferring said columns of pieces between the different treatment modules.

L'expérience a montré que le type d'installation objet des brevets mentionnés ci-dessus peut être appliqué à d'autres types de traitement que ceux décrits dans ces brevets.Experience has shown that the type of installation which is the subject of the patents mentioned above can be applied to other types of treatment than those described in these patents.

On sait que la qualité des produits faisant l'objet d'un traitement thermique doit répondre aux exigences suivantes :
- tenue d'un état de surface
- maintien de la stabilité dimensionnelle des produits traités et
- maintien ou amélioration ou restauration de la structure métallurgique et des propriétés mécaniques des produits traités.We know that the quality of products subject to heat treatment must meet the following requirements:
- maintenance of a surface finish
- maintaining the dimensional stability of the products treated and
- maintenance or improvement or restoration of the metallurgical structure and mechanical properties of the products treated.

En conséquence, la présente invention se propose d'appliquer les installations décrites ci-dessus à des traitements de pièces notamment de pièces mécaniques, en vue de l'obtention des résultats mentionnés ci-dessus, ces traitements étant caractérisés par les opérations suivantes : chauffage, maintien en température et refroidissement contrôlé.Consequently, the present invention proposes to apply the installations described above to treatments of parts in particular of mechanical parts, with a view to obtaining the results mentioned above, these treatments being characterized by the following operations: heating , temperature maintenance and controlled cooling.

On comprend que pour obtenir la qualité requise des produits traités finalement obtenus, l'invention se propose d'envisager plusieurs types de traitement sur les installations décrites dans les brevets mentionnés ci-dessus.It is understood that in order to obtain the required quality of the treated products finally obtained, the invention proposes to envisage several types of treatment on the installations described in the patents mentioned above.

1) Traitement en vue du maintien et de l'amélioration de l'état de surface des pièces ;1) Treatment with a view to maintaining and improving the surface condition of the parts;

Ce traitement peut comporter un dégazage. En effet, même si la surface du produit est exempte de dépôts, elle peut contenir des espèces gazeuses adsorbées et par élévation de la température, mise sous vide et maintien sous vide pendant un temps suffisant, il est possible de réduire de façon importante la teneur de ces espèces gazeuses dans le produit finalement obtenu ;This treatment may include degassing. Indeed, even if the surface of the product is free of deposits, it may contain adsorbed gaseous species and by raising the temperature, placing under vacuum and maintaining under vacuum for a sufficient time, it is possible to significantly reduce the content. of these gaseous species in the product finally obtained;

On peut également réaliser un dégraissage qui peut être opéré par l'intermédiaire d'un chauffage rapide sous un courant gazeux d'hydrogène et de vapeur d'eau.Degreasing can also be carried out, which can be carried out by means of rapid heating under a gaseous stream of hydrogen and water vapor.

Enfin, on peut également contribuer à l'amélioration de l'état de surface des pièces par une réduction des oxydes superficiels, réalisée par un chauffage sous courant d'hydrogène ou une restauration de carbone de pièces décarburées superficiellement, opérée par chauffage sous courants de gaz tels que CnHn ou CnHnOn.Bien entendu, Ies traitements concernant la tenue d'état de surface des pièces traitées peuvent comporter d'autres opérations telles que notamment bleuissage etc.Finally, one can also contribute to the improvement of the surface condition of the parts by a reduction of surface oxides, carried out by heating under a stream of hydrogen or a carbon restoration of decarburized parts superficially, operated by heating under streams of gases such as CnHn or CnHnOn. Of course, the treatments concerning the maintenance of the surface finish of the treated parts may include other operations such as blueing, etc.

2) Traitement en vue du maintien de la stabilité dimensionnelle des pièces traitées.2) Treatment in order to maintain the dimensional stability of the treated parts.

On sait que les déformations des pièces lors du traitement thermique constituent un souci constant pour le producteur. L'origine de ces déformations résulte de trois causes majeures :
- Les hétérogénéités de matières (ségrégation, etc.)
- Les contraintes générées pendant le formage et l'usinage
- Les hétérogénéités dues au traitement.We know that the deformations of the parts during the heat treatment constitute a constant concern for the producer. The origin of these deformations results from three major causes:
- Heterogeneities of materials (segregation, etc.)
- Constraints generated during forming and machining
- Heterogeneities due to treatment.

L'invention se propose donc de réaliser des opérations permettant d'éviter ces inconvénients pour conserver la stabilité dimensionnelle des pièces traitées. Ces traitements peuvent être les suivants :
- recuit d'homogénéisation à une température inférieure à la température à laquelle la ferrite achève de se transformer en austénite au cours du chauffage, et maintien à cette température
- recuit de détente réalisé par maintien à une température de l'ordre de 650°C pendant une durée d'une heure
- recuit de relaxation réalisé par chauffage à une température de l'ordre de 100 à 200°C avec maintien à cette température puis refroidissement lent et
- recuit de stabilisation effectué par chauffage à une température à laquelle l'austénite commence à se former, par exemple à environ 200°C, ce chauffage étant suivi d'un refroidissement rapide.The invention therefore proposes to carry out operations which make it possible to avoid these drawbacks in order to maintain the dimensional stability of the parts treated. These treatments can be as follows:
- homogenization annealing at a temperature below the temperature at which the ferrite completes to transform into austenite during heating, and maintenance at this temperature
- stress relief annealing performed by maintaining at a temperature of the order of 650 ° C. for a period of one hour
relaxation annealing carried out by heating to a temperature of the order of 100 to 200 ° C. with maintenance at this temperature then slow cooling and
- Stabilization annealing carried out by heating to a temperature at which the austenite begins to form, for example at around 200 ° C., this heating being followed by rapid cooling.

3) Traitement en vue de la conservation de la structure métallurgique et des propriétés mécaniques des pièces traitées3) Treatment with a view to preserving the metallurgical structure and the mechanical properties of the treated parts

Ce traitement comporte essentiellement un recuit d'adoucissement. Comme on l'a précisé ci-dessus, les différents types de traitement qui viennent d'être mentionnés pour maintenir la qualité des produits devant faire ou ayant fait l'objet d'un traitement thermique comportent essentiellement trois types d'opération : chauffage, maintien en température et refroidissement contrôlé, qui, selon l'invention, sont effectués sur une installation du type décrit dans les demandes de brevet citées ci-dessus.This treatment essentially involves a softening annealing. As stated above, the different types of treatment which have just been mentioned in order to maintain the quality of the products which are to be or have undergone heat treatment essentially comprise three types of operation: heating, temperature maintenance and controlled cooling, which, according to the invention, are carried out on an installation of the type described in the patent applications cited above.

Les chauffages nécessaires aux recuits ou revenus peuvent être opérés dans les chambres de chauffage par induction prévues dans ces installations ou dans une ou des chambres de traitement dans le cas de cycles de températures particuliers.The heating necessary for annealing or tempering can be carried out in the induction heating chambers provided in these installations or in one or more treatment chambers in the case of specific temperature cycles.

Le maintien à température peut être exécuté en fonction des cycles concernés, soit :
- dans la chambre de chauffage par induction
- dans les chambres de traitement thermochimique si le maintien a lieu à une température à laquelle la ferrite est transformée en austénite au cours du chauffage
- dans des chambres à température adaptée, lorsque le maintien à température a lieu à une température différente de celle indiquée ci-­dessus.Keeping at temperature can be performed according to the cycles concerned, either:
- in the induction heating chamber
- in the thermochemical treatment chambers if the maintenance takes place at a temperature at which the ferrite is transformed into austenite during heating
- in rooms with suitable temperature, when the temperature is maintained at a temperature different from that indicated above.

Le refroidissement peut être opéré soit dans la chambre de trempe, soit par convection, par rayonnement seul ou à l'aide d'un gaz neutre à température convenable ou par tout autre moyen approprié.The cooling can be carried out either in the quenching chamber, or by convection, by radiation alone or using a neutral gas at a suitable temperature or by any other suitable means.

Lorsque le traitement est préliminaire ou consécutif au traitement thermochimique, il peut être effectué directement et automatiquement dans l'installation sans qu'il soit nécessaire de procéder à une sortie des pièces de celle-ci.When the treatment is preliminary or consecutive to the thermochemical treatment, it can be carried out directly and automatically in the installation without it being necessary to carry out a removal of the parts from the latter.

Bien entendu, et selon l'invention, l'ensemble des traitements est effectué de façon automatique à l'aide d'un logiciel approprié, l'automate ainsi programmé gérant les cycles suivants :
- la circulation des charges dans la machine, en fonction des différents cycles envisagés ;
- les indexations adéquates :
* puissance, temps en chauffage par induction ;
* température en maintien
* modulation en refroidissement
Il résulte de la description qui précède que l'invention permet de réaliser simultanément à l'aide d'une même installation et de façon alternative des traitements de cémentation (température et atmosphère appropriées), recuit et/ou dégraissage-dégazage, le système de gestion de l'installation gérant de deux ou plusieurs cycles différents.Of course, and according to the invention, all the processing is carried out automatically using appropriate software, the automaton thus programmed managing the following cycles:
- the circulation of the charges in the machine, according to the different cycles envisaged;
- adequate indexing:
* power, time in induction heating;
* holding temperature
* cooling modulation
It follows from the foregoing description that the invention makes it possible to simultaneously carry out, using the same installation and alternatively, carburizing treatments (appropriate temperature and atmosphere), annealing and / or degreasing-degassing, the management of the installation managing two or more different cycles.

Il demeure bien entendu que la présente invention n'est pas limitée aux exemples de mise en oeuvre décrits ici mais qu'elle en englobe toutes les variantes.It remains to be understood that the present invention is not limited to the exemplary embodiments described here but that it encompasses all variants thereof.

Claims (12)

1- Installation automatique automatisée de traitement de pièces, notamment pour l'industrie mécanique du type comportant des modules de traitement tels que notamment modules de préchauffage, modules de traitement thermochimique et modules de trempe, caractérisée en ce qu'elle est appliquée à des traitements de chauffage, maintien en température et refroidissement contrôlé, en vue de maintenir ou d'améliorer l'état de surface, la stabilité dimensionnelle et la structure métallurgique ainsi que les propriétés mécaniques des pièces traitées.1- Automatic automated installation for processing parts, in particular for the mechanical industry of the type comprising processing modules such as in particular preheating modules, thermochemical treatment modules and quenching modules, characterized in that it is applied to treatments heating, temperature maintenance and controlled cooling, in order to maintain or improve the surface condition, dimensional stability and metallurgical structure as well as the mechanical properties of the treated parts. 2- Installation selon la revendication 1, appliquée au traitement des pièces en vue d'en améliorer l'état de surface, caractérisée en ce que ce traitement comporte un dégazage réalisé par élévation de température et mise sous vide pendant un temps désiré.2- Installation according to claim 1, applied to the treatment of parts in order to improve the surface condition, characterized in that this treatment includes degassing carried out by raising the temperature and placing under vacuum for a desired time. 3- Installation selon la revendication 1, appliquée au traitement des pièces en vue d'en améliorer l'état de surface, caractérisée en ce que ce traitement comporte un dégraissage opéré par chauffage rapide sous courant gazeux d'hydrogène et de vapeur d'eau.3- Installation according to claim 1, applied to the treatment of parts with a view to improving the surface condition, characterized in that this treatment comprises a degreasing carried out by rapid heating under gaseous current of hydrogen and water vapor . 4- Installation selon la revendication 1, appliquée au traitement des pièces en vue d'en améliorer l'état de surface, caractérisée en ce que ce traitement comporte une réduction des oxydes superficiels opérée par chauffage sous courant d'hydrogène, ou une restauration de carbone de pièces décarburées superficiellement opérée par chauffage sous courants de gaz tels que Cn Hn ou Cn Hn On.4- Installation according to claim 1, applied to the treatment of parts in order to improve the surface condition, characterized in that this treatment comprises a reduction of surface oxides operated by heating under a stream of hydrogen, or a restoration of carbon from decarburized parts superficially operated by heating under gas streams such as Cn Hn or Cn Hn On. 5 - Installation selon la revendication 1, appliquée au traitement des pièces en vue de maintenir leur stabilité dimensionnelle, caractérisée en ce que ce traitement comporte un recuit d'homogénéisation opéré à une température à laquelle la ferrite est transformée en austénite au cours du chauffage et maintien à cette température.5 - Installation according to claim 1, applied to the treatment of parts in order to maintain their dimensional stability, characterized in that this treatment comprises an annealing of homogenization operated at a temperature at which the ferrite is transformed into austenite during heating and maintain at this temperature. 6- Installation selon la revendication 1, appliquée au traitement des pièces en vue de maintenir leur stabilité dimensionnelle, caractérisée en ce que ce traitement comporte un recuit de détente opéré par un maintien à une température de l'ordre de 650°C pendant une heure.6- Installation according to claim 1, applied to the treatment of parts in order to maintain their dimensional stability, characterized in that this treatment comprises a stress relief annealing effected by maintaining at a temperature of the order of 650 ° C for one hour. 7- Installation selon la revendication 1, appliquée au traitement des pièces en vue de maintenir leur stabilité dimensionnelle, caractérisée en ce que ce traitement comporte un recuit de relaxation opéré par chauffage à une température de l'ordre de 100 à 200°C avec maintien et refroidissement lent.7- Installation according to claim 1, applied to the treatment of parts in order to maintain their dimensional stability, characterized in that this treatment comprises a relaxation annealing operated by heating at a temperature of the order of 100 to 200 ° C with maintenance and slow cooling. 8- Installation selon la revendication 1, appliquée au traitement des pièces en vue de maintenir leur stabilité dimensionnelle, caractérisée en ce que ce traitement comporte un recuit de stabilisation réalisé par un chauffage à une température inférieure à la température à laquelle l'austénite commence à se former au cours du chauffage et un refroidissement rapide.8- Installation according to claim 1, applied to the treatment of parts in order to maintain their dimensional stability, characterized in that this treatment comprises a stabilization annealing performed by heating at a temperature below the temperature at which the austenite begins to form during rapid heating and cooling. 9- Installation selon la revendication 1 appliquée au traitement des pièces en vue du maintien de leur structure métallurgique et de leurs propriétés mécaniques, caractérisée en ce que ce traitement consiste en un recuit d'adoucissement.9- Installation according to claim 1 applied to the treatment of parts in order to maintain their metallurgical structure and their mechanical properties, characterized in that this treatment consists of a softening annealing. 10- Installation selon l'une quelconque des revendication précédentes, caractérisée en ce que les chauffages nécessaires aux opérations de recuit et de revenu sont opérées dans les chambres de chauffage par induction de l'installation.10- Installation according to any one of the preceding claims, characterized in that the heating necessary for annealing and tempering operations are carried out in the induction heating chambers of the installation. 11- Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que le maintien à température est réalisé en fonction des cycles concernés, soit dans la chambre de chauffage par induction, soit dans les chambres de traitement thermochimiques lorsque le maintien a lieu à une température supérieure à celle à laquelle la phase alpha achève de se transformer en austénite au cours du chauffage, soit dans des chambres à température adaptée, si ce maintien à température a lieu à une température différente.11- Installation according to any one of the preceding claims, characterized in that the temperature maintenance is carried out according to the cycles concerned, either in the induction heating chamber, or in the thermochemical treatment chambers when the maintenance takes place at a temperature higher than that at which the alpha phase completes to transform into austenite during heating, or in chambers at suitable temperature, if this temperature maintenance takes place at a different temperature. 12- Installation selon l'une quelconque des revendications précédentes, caractérisée en ce que le refroidissement est opéré dans la chambre de trempe, soit par convection, par rayonnement seul ou à l'aide d'un gaz neutre à température appropriée.12- Installation according to any one of the preceding claims, characterized in that the cooling is carried out in the quenching, either by convection, by radiation alone or using a neutral gas at an appropriate temperature.
EP89403635A 1988-12-27 1989-12-22 Automatic thermal treatment installations Withdrawn EP0376832A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8817245 1988-12-27
FR8817245A FR2640999A1 (en) 1988-12-27 1988-12-27

Publications (1)

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EP0376832A1 true EP0376832A1 (en) 1990-07-04

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EP89403635A Withdrawn EP0376832A1 (en) 1988-12-27 1989-12-22 Automatic thermal treatment installations

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EP (1) EP0376832A1 (en)
JP (1) JPH03503187A (en)
KR (1) KR910700358A (en)
CN (1) CN1043958A (en)
CA (1) CA2004761A1 (en)
DD (1) DD290665A5 (en)
DE (1) DE376832T1 (en)
ES (1) ES2016785A4 (en)
FR (1) FR2640999A1 (en)
GR (1) GR900300153T1 (en)
WO (1) WO1990007583A1 (en)

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KR100349809B1 (en) * 2000-03-15 2002-08-23 (주)현광금속개발 Heat-processing method of metal materials
CN106148653A (en) * 2016-08-31 2016-11-23 成都真火科技有限公司 A kind of material treatment systems

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Publication number Priority date Publication date Assignee Title
FR2355261A1 (en) * 1976-06-17 1978-01-13 Daido Steel Co Ltd CONTINUOUS OVEN WITH CONTROLLED ATMOSPHERE AND THERMAL TREATMENT PROCESS
FR2537260A1 (en) * 1982-12-02 1984-06-08 Traitement Sous Vide Multicellular oven for heat treatment, thermochemical treatment or electrothermal treatment of metals in a rarified atmosphere
EP0209408A1 (en) * 1985-06-25 1987-01-21 Stein Heurtey Apparatus for thermochemical treatments at various temperatures and atmospheres, especially for car manufacturing
EP0236639A1 (en) * 1986-02-12 1987-09-16 Stein Heurtey Flexible automatic installation for performing a fast thermochemical treatment
EP0296102B1 (en) * 1987-06-03 1993-05-05 Pierre Beuret Device with several components for heat treatment

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2355261A1 (en) * 1976-06-17 1978-01-13 Daido Steel Co Ltd CONTINUOUS OVEN WITH CONTROLLED ATMOSPHERE AND THERMAL TREATMENT PROCESS
FR2537260A1 (en) * 1982-12-02 1984-06-08 Traitement Sous Vide Multicellular oven for heat treatment, thermochemical treatment or electrothermal treatment of metals in a rarified atmosphere
EP0209408A1 (en) * 1985-06-25 1987-01-21 Stein Heurtey Apparatus for thermochemical treatments at various temperatures and atmospheres, especially for car manufacturing
EP0236639A1 (en) * 1986-02-12 1987-09-16 Stein Heurtey Flexible automatic installation for performing a fast thermochemical treatment
EP0296102B1 (en) * 1987-06-03 1993-05-05 Pierre Beuret Device with several components for heat treatment

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
HÄRTEREI-TECHNISCHE MITTEILUNGEN (HTM), vol. 42, no. 1, janvier/février 1987, pages 56-60, Carl Hanser Verlag, Munich, DE; K. MAY: "Dreikammer-Automaten als technische und wirtschaftliche Alternative zu Durchstoss-Anlagen" *
HÄRTEREI-TECHNISCHE MITTEILUNGEN (HTM), vol. 42, no. 3, mai/juin 1987, pages 169-173, Carl Hanser Verlag, Munich, DE; K. HEUERTZ: "Mehrzweck-Schachtofen-Automat mit gasdichter beheizter Umsetzvorrichtung" *

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DD290665A5 (en) 1991-06-06
KR910700358A (en) 1991-03-14
GR900300153T1 (en) 1991-09-27
ES2016785A4 (en) 1990-12-01
JPH03503187A (en) 1991-07-18
FR2640999A1 (en) 1990-06-29
CN1043958A (en) 1990-07-18
DE376832T1 (en) 1991-01-17
WO1990007583A1 (en) 1990-07-12
CA2004761A1 (en) 1990-06-27

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