EP2797704B1 - Method of coating a forge die in the implementation of parts obtained by two successive operations of foundry casting followed by forging - Google Patents

Method of coating a forge die in the implementation of parts obtained by two successive operations of foundry casting followed by forging Download PDF

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Publication number
EP2797704B1
EP2797704B1 EP12812292.6A EP12812292A EP2797704B1 EP 2797704 B1 EP2797704 B1 EP 2797704B1 EP 12812292 A EP12812292 A EP 12812292A EP 2797704 B1 EP2797704 B1 EP 2797704B1
Authority
EP
European Patent Office
Prior art keywords
preform
foundry
forging
coating
forge die
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.)
Not-in-force
Application number
EP12812292.6A
Other languages
German (de)
French (fr)
Other versions
EP2797704A1 (en
Inventor
Emile Di Serio
Fabien SOUBRAS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Jean Industries SAS
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Saint Jean Industries SAS
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Filing date
Publication date
Application filed by Saint Jean Industries SAS filed Critical Saint Jean Industries SAS
Priority to PL12812292T priority Critical patent/PL2797704T3/en
Publication of EP2797704A1 publication Critical patent/EP2797704A1/en
Application granted granted Critical
Publication of EP2797704B1 publication Critical patent/EP2797704B1/en
Priority to HRP20160035TT priority patent/HRP20160035T1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J3/00—Lubricating during forging or pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002—Hybrid process, e.g. forging following casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening

Definitions

  • the invention relates to the technical sector of the parts obtained by casting operations of foundry, forging and also parts undergoing two successive operations casting foundry and forging.
  • this method consists of producing a preform in the foundry casting of aluminum or aluminum alloy parts and then transferring it to a forge die whose imprint is substantially smaller in size than the dimensions of the preform and exerting a striking operation to obtain a part with the shapes and dimensions chosen with superior mechanical characteristics.
  • the foundry casting preform is immersed in a bath containing a graphite coating and then transferred into a tunnel oven at a temperature of the order of 400 to 500 °.
  • This Transfer operation in the tunnel furnace is intended to make particularly malleable the preform for the next forging operation.
  • the forge matrix also has a prior emulsion type poteyage to facilitate the creep of the material in the area of the burr and prevent the alloy from adhering to the tools.
  • foundry poteyage is the action of depositing a protective coating to facilitate the release of the part.
  • This practice is known for sand casting, metal casting, gravitational casting.
  • the poteyage can be permanent (ex casting metal mold) or applied between each casting.
  • the poteyage is done through nozzles or brushes.
  • Foundry is also known in the foundry to oil by manifold or robot and also the dry poteyage in the particular case of the foundry under pressure.
  • the invention consists in implementing in a casting process a preform in shapes of desired dimensions, to transfer said foundry preform in a tunnel oven and then a preheating operation at a temperature of the order of 500 °, to transfer the preheated foundry preform in a forge matrix to dimensions and substantially less shape and perform the striking operation at a pressure of the order of 600 to 700 MPa, the method being characterized in that prior to transferring the preheated foundry preform into the forging die, said forging die and pin-shaped preform positioning means are subjected to a powder-spraying operation over the entire surface inside of the forge die capable of receiving the preheated foundry preform and on the pins.
  • the spraying can be done with or without electrostatic deposition.
  • the electrostatic deposition ensures homogeneous deposition and makes it possible to reach inaccessible areas on the forge die with respect to the configuration of the preform.
  • the powder which is sprayed and sprayed contains a wax as a carrier for the release agents and melts at 100 ° C.
  • the powder may include a composition based on graphite particles or not in very limited proportions in the case of electrostatic deposition of the order of 10% maximum.
  • the solution provided by the invention has many advantages over the technology developed by the Applicant. It is no longer necessary to have a retention tray graphited coating and there is more water to use. There is no longer a need to monitor the dilution ratio which significantly reduces the cost of monitoring and maintenance. The noise made for the projection of the liquid potting on the matrix is reduced to the environmental level, as for the suppression of the coating tanks, there is no longer any liquid discharge and there is no fouling of the network. Aspiration related to the projection of liquid potting on the matrix.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Mold Materials And Core Materials (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

L'invention se rattache au secteur technique des pièces obtenues suivant des opérations de coulage de fonderie, de forgeage et aussi de pièces subissant deux opérations successives de coulage de fonderie puis de forge.The invention relates to the technical sector of the parts obtained by casting operations of foundry, forging and also parts undergoing two successive operations casting foundry and forging.

Cette dernière technologie a été développée et décrite dans le brevet EP 119 365 exploitée par le Demandeur, en particulier pour le traitement de pièces en aluminium et/ou alliage d'aluminium, et alliages légers.This latter technology was developed and described in the patent EP 119,365 operated by the Applicant, in particular for the treatment of aluminum and / or aluminum alloy parts, and light alloys.

Ainsi ce procédé consiste à réaliser en coulage de fonderie de pièces en aluminium ou en alliage d'aluminium une préforme puis à la transférer dans une matrice de forge dont l'empreinte est de dimensions sensiblement inférieure aux dimensions de la préforme et d'exercer une opération de frappe afin d'obtenir une pièce aux formes et aux dimensions choisies avec des caractéristiques mécaniques supérieures.Thus, this method consists of producing a preform in the foundry casting of aluminum or aluminum alloy parts and then transferring it to a forge die whose imprint is substantially smaller in size than the dimensions of the preform and exerting a striking operation to obtain a part with the shapes and dimensions chosen with superior mechanical characteristics.

Le Demandeur a développé de nombreux perfectionnements dans cette technologie et en particulier celui d'une enduction graphite après l'obtention de la préforme de fonderie. Cette technologie d'une dépose d'une enduction graphite a été décrite en particulier dans le brevet FR 2 803 232 .The Applicant has developed many improvements in this technology and in particular that of a graphite coating after obtaining the foundry preform. This technology of a deposit of a graphite coating has been described in particular in the patent FR 2 803 232 .

En pratique, la préforme obtenue de coulage de fonderie est immergée dans un bain contenant une enduction graphite puis transférée dans un four tunnel à une température de l'ordre de 400 à 500°. Cette opération de transfert dans le four tunnel a pour but de rendre notamment plus malléable la préforme pour l'opération suivante de forge.In practice, the foundry casting preform is immersed in a bath containing a graphite coating and then transferred into a tunnel oven at a temperature of the order of 400 to 500 °. This Transfer operation in the tunnel furnace is intended to make particularly malleable the preform for the next forging operation.

Puis la préforme ainsi enduite est transférée dans la matrice de forge pour l'exécution de la frappe. La matrice de forge a aussi un poteyage préalable type émulsion pour faciliter le fluage de la matière dans la zone de la bavure et éviter l'adhésion de l'alliage sur les outils.Then the preform thus coated is transferred into the forge die for execution of the strike. The forge matrix also has a prior emulsion type poteyage to facilitate the creep of the material in the area of the burr and prevent the alloy from adhering to the tools.

Cette solution technique est largement exploitée par le Demandeur. Ceci étant, et en pratique, elle entraîne des surcoûts à deux niveaux :

  • Tout d'abord l'utilisation de l'enduction graphite nécessite un contrôle des bains et de la dilution car le graphite utilisé est dilué dans de l'eau. Le contrôle reste donc contraignant en exigeant la mise en oeuvre de moyens correcteurs et de stabilisation du bain de l'enduction graphite.
  • Ensuite, il est nécessaire d'utiliser une émulsion à pulvériser sur la matière de forge, émulsion qui refroidit la matrice à chaque fois et génère des chocs thermiques ce qui diminue la durée de vie de la matrice.
This technical solution is widely exploited by the Applicant. This being so, and in practice, it involves additional costs on two levels:
  • First of all, the use of the graphite coating requires a control of the baths and the dilution because the graphite used is diluted in water. The control therefore remains binding by requiring the implementation of correcting means and stabilization of the bath of the graphite coating.
  • Then, it is necessary to use a spray emulsion on the forge material, emulsion which cools the matrix each time and generates thermal shocks which reduces the life of the matrix.

Face à cette problématique inhérente à l'exploitation de cette technologie du coulé-forgé connue sous la marque 'COBAPRESS' du Demandeur, c'est-à-dire de la fabrication de pièces en aluminium ou alliage d'aluminium ou alliages légers par deux opérations successives de coulage d'une préforme puis de forgeage de celle-ci, le Demandeur a tenté de réfléchir et de rechercher une solution qui améliore la phase d'enduction graphitée ou qui puisse se substituer à celle-ci.Faced with this problematic inherent in the exploitation of this casting-forged technology known under the brand name 'COBAPRESS' of the Applicant, that is to say the manufacture of aluminum parts or aluminum alloy or light alloys by two successive operations pouring a preform and forging thereof, the Applicant has tried to think and seek a solution that improves the graphitized coating phase or can be substituted for it.

La démarche du Demandeur a donc été de s'intéresser à la technique du poteyage connue de manière courante séparément dans le domaine de la fonderie puis celle de la forge, totalement indépendantes l'une de l'autre à la connaissance du Demandeur.The Applicant's approach was therefore to be interested in the technique of poteyage commonly known separately in the field of foundry and then that of the forge, totally independent of each other to the knowledge of the Applicant.

Succinctement, et à titre de rappel, en fonderie le poteyage est l'action consistant à déposer un revêtement protecteur pour faciliter le démoulage de la pièce. Cette pratique est connue pour le moulage au sable, le moulage métallique, la fonderie gravitée. Le poteyage peut être permanent (ex fonderie moule métallique) ou appliqué entre chaque coulée. Le poteyage s'effectue par le biais de buses ou de pinceaux.Briefly, and as a reminder, foundry poteyage is the action of depositing a protective coating to facilitate the release of the part. This practice is known for sand casting, metal casting, gravitational casting. The poteyage can be permanent (ex casting metal mold) or applied between each casting. The poteyage is done through nozzles or brushes.

On connaît aussi en fonderie le poteyage à l'huile par manifold ou par robot et aussi le poteyage à sec dans le cas particulier de la fonderie sous pression.Foundry is also known in the foundry to oil by manifold or robot and also the dry poteyage in the particular case of the foundry under pressure.

Dans le domaine de la forge traditionnelle, on utilise aussi des poteyages pour aider au fluage de la matière et éviter l'adhésion du métal sur les matrices. Ainsi sont utilisées des huiles graphites, des solutions aqueuses graphitées ou non pour pulvérisation ou enduction, des céramiques, des lubrifiants solides type poteyage à sec.In the field of traditional forging, we also use poteyages to help creep the material and prevent the adhesion of metal on the dies. Thus are used graphite oils, aqueous solutions graphite or not for spraying or coating, ceramics, dry type solid lubricants type.

Si aussi bien dans la fonderie et la forge prises séparément on connaît la mise en oeuvre du poteyage à sec, la mise en oeuvre de cette solution n'a jamais été appliquée dans un procédé susceptible de combiner les deux opérations successives de coulage de fonderie puis de forgeage. Le Demandeur a lui-même été à l'origine du procédé 'COBAPRESS' défini dans le brevet EP 119 365 , a développé la mise en oeuvre d'une enduction graphite comme rappelé précédemment dans le brevet FR 2 803 232 .If both the foundry and the forge separately taken into account the implementation of dry potting, the implementation of this solution has never been applied in a process likely to combine the two successive foundry casting operations and then forging. The Applicant was himself at the origin of the process 'COBAPRESS' defined in the patent EP 119,365 , has developed the implementation of a graphite coating as recalled previously in the patent FR 2 803 232 .

En pratique, c'est par la nature de ce procédé 'COBAPRESS' du coulé-forgé qu'il y avait l'impossibilité d'utiliser la technique de poteyage dans ses solutions traditionnelles et des techniques connues utilisées en fonderie traditionnelle et en forge traditionnelle.In practice, it is by the nature of this cast-poured 'COBAPRESS' process that it was impossible to use the potting technique in its traditional solutions and known techniques used in traditional foundry and traditional forging. .

Le Demandeur qui s'est longuement intéressé à cette problématique en examinant toutes les incidences du coût et de mise en oeuvre a découvert une solution particulièrement intéressante dans le cadre d'une sélection particulière de l'opération de poteyage et ainsi une maîtrise des coûts de fabrication et des conditions d'intervention sans être une gêne pour un coût d'investissement rédhibitoire.The Applicant, who has been interested in this problem for a long time by examining all the cost and implementation implications, has discovered a particularly interesting solution in the context of a particular selection of the poteyage operation and thus a control of the costs of manufacturing and conditions of intervention without being a hindrance for a prohibitive investment cost.

Les tests effectués confirment l'intérêt de la solution apportée par le Demandeur.The tests carried out confirm the interest of the solution provided by the Applicant.

Ainsi selon l'invention, celle-ci consiste à mettre en oeuvre dans un procédé consistant à couler en fonderie une préforme selon des formes à dimensions souhaitées, à transférer la dite préforme de fonderie dans un four tunnel puis une opération de préchauffage à une température de l'ordre de 500°, à transférer la préforme de fonderie préchauffée dans une matrice de forge aux dimensions et forme sensiblement moindre et effectuer l'opération de frappe à une pression de l'ordre de 600 à 700 MPa, le procédé étant caractérisé en ce que avant le transfert de la préforme de fonderie préchauffée dans la matrice de forge, la dite matrice de forge et les moyens de positionnement de la préforme constitués par des broches sont soumises à une opération de pulvérisation d'une poudre sur toute la surface intérieure de la matrice de forge susceptible de recevoir la préforme de fonderie préchauffée et sur les broches.Thus according to the invention, it consists in implementing in a casting process a preform in shapes of desired dimensions, to transfer said foundry preform in a tunnel oven and then a preheating operation at a temperature of the order of 500 °, to transfer the preheated foundry preform in a forge matrix to dimensions and substantially less shape and perform the striking operation at a pressure of the order of 600 to 700 MPa, the method being characterized in that prior to transferring the preheated foundry preform into the forging die, said forging die and pin-shaped preform positioning means are subjected to a powder-spraying operation over the entire surface inside of the forge die capable of receiving the preheated foundry preform and on the pins.

Selon une autre caractéristique de l'invention, la pulvérisation peut se faire avec ou sans dépôt électrostatique.According to another characteristic of the invention, the spraying can be done with or without electrostatic deposition.

Le dépôt électrostatique assure un dépôt homogène et permet d'atteindre des zones inaccessibles sur la matrice de forge en égard de la configuration de la préforme. La poudre qui est projetée et pulvérisée contient une cire servant de vecteur aux agents démoulant et elle fond à 100°C. La poudre peut inclure une composition à base de particules graphitées ou non dans des proportions très limitées dans le cas du dépôt électrostatique de l'ordre de 10% maximum.The electrostatic deposition ensures homogeneous deposition and makes it possible to reach inaccessible areas on the forge die with respect to the configuration of the preform. The powder which is sprayed and sprayed contains a wax as a carrier for the release agents and melts at 100 ° C. The powder may include a composition based on graphite particles or not in very limited proportions in the case of electrostatic deposition of the order of 10% maximum.

La solution apportée par l'invention présente de nombreux avantages par rapport à la technologie développée par le Demandeur. Il n'est plus nécessaire d'avoir de bac de rétention de l'enduction graphitée et il n'y a plus d'eau à utiliser. Il n'y a plus nécessité d'assurer un suivi du taux de dilution ce qui réduit considérablement le coût de suivi et d'entretien. On réduit au niveau environnemental le bruit fait pour la projection du poteyage liquide sur la matrice, quant à la suppression des bacs d'enduction, il n'y a plus de rejet liquide et il n'y a pas d'encrassement du réseau d'aspiration lié à la projection de poteyage liquide sur la matrice.The solution provided by the invention has many advantages over the technology developed by the Applicant. It is no longer necessary to have a retention tray graphited coating and there is more water to use. There is no longer a need to monitor the dilution ratio which significantly reduces the cost of monitoring and maintenance. The noise made for the projection of the liquid potting on the matrix is reduced to the environmental level, as for the suppression of the coating tanks, there is no longer any liquid discharge and there is no fouling of the network. Aspiration related to the projection of liquid potting on the matrix.

Au niveau technique, on améliore le fluage de la préforme lors de l'opération de forgeage, on diminue l'encrassement des outils utilisés lors du forgeage et on a une augmentation de la durée de vie de la matrice de frappe qui est soumise à moins de chocs thermiques.At the technical level, it improves the creep of the preform during the forging operation, it reduces the fouling of the tools used during forging and has an increase in the life of the striking matrix that is subject to less thermal shocks.

Claims (5)

  1. Method consisting in implementing in a foundry a preform to the desired sized shapes, in transferring this foundry preform to a tunnel oven then preheating it to a temperature of around 400 to 500°, transferring the preheated foundry preform into a forge die with a substantially smaller size and shape and performing the die punching operation at a pressure of between 600 and 700 MPA, the method being characterized in that, before the transfer of the preheated foundry preform to the forge die, the forge die and the means of positioning the preform, consisting of pins, are put through a powder-spraying operation on the entire in a surface of the forge die which is likely to receive the preheated foundry preform, and on the pins.
  2. Method according to claim 1, characterized in that the spraying of the powder is made by electrostatic depositing.
  3. Method according to claim 2, characterized in that the powder contains particles.
  4. Method according to claim 3, characterized in that the particles are graphite particles.
  5. Method according to either of claims 3 and 4 characterized in that the powder includes a composition of particles in a proportion of approximately 10% maximum.
EP12812292.6A 2011-12-29 2012-12-05 Method of coating a forge die in the implementation of parts obtained by two successive operations of foundry casting followed by forging Not-in-force EP2797704B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL12812292T PL2797704T3 (en) 2011-12-29 2012-12-05 Method of coating a forge die in the implementation of parts obtained by two successive operations of foundry casting followed by forging
HRP20160035TT HRP20160035T1 (en) 2011-12-29 2016-01-13 Method of coating a forge die in the implementation of parts obtained by two successive operations of foundry casting followed by forging

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1162512A FR2985205B1 (en) 2011-12-29 2011-12-29 METHOD OF POTEYING OF FORGE MATRIX IN THE IMPLEMENTATION OF PIECES OBTAINED BY TWO SUCCESSIVE FOUNDRY CASTING AND THEN FORGING PROCEDURES
PCT/FR2012/052804 WO2013098501A1 (en) 2011-12-29 2012-12-05 Method of dressing a forge die in the implementation of parts obtained by two successive operations of foundry casting followed by forging

Publications (2)

Publication Number Publication Date
EP2797704A1 EP2797704A1 (en) 2014-11-05
EP2797704B1 true EP2797704B1 (en) 2015-10-14

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US (1) US10369619B2 (en)
EP (1) EP2797704B1 (en)
CN (1) CN104080558B (en)
BR (1) BR112014015689A2 (en)
ES (1) ES2557190T3 (en)
FR (1) FR2985205B1 (en)
HR (1) HRP20160035T1 (en)
HU (1) HUE026340T2 (en)
IN (1) IN2014KN01357A (en)
MX (1) MX343436B (en)
PL (1) PL2797704T3 (en)
RU (1) RU2609159C2 (en)
WO (1) WO2013098501A1 (en)

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FR3030370B1 (en) * 2014-12-17 2018-04-20 Saint Jean Industries METHOD FOR MANUFACTURING A HYBRID WHEEL IN TWO LIGHT ALLOY PARTS ESPECIALLY ALUMINUM INCLUDING EVIDENCE IN ONE OF THE PNEUMATIC HEEL SEATS
CN109013994A (en) * 2018-07-20 2018-12-18 哈尔滨工业大学 A kind of nearly isothermal precision forging method of titanium alloy forging based on temperature-compensating

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Publication number Publication date
WO2013098501A1 (en) 2013-07-04
MX2014007943A (en) 2014-11-21
US20140373592A1 (en) 2014-12-25
PL2797704T3 (en) 2016-03-31
RU2014125852A (en) 2016-01-27
EP2797704A1 (en) 2014-11-05
FR2985205B1 (en) 2014-01-10
ES2557190T3 (en) 2016-01-22
RU2609159C2 (en) 2017-01-30
CN104080558B (en) 2016-10-05
MX343436B (en) 2016-11-04
US10369619B2 (en) 2019-08-06
HUE026340T2 (en) 2016-05-30
FR2985205A1 (en) 2013-07-05
CN104080558A (en) 2014-10-01
HRP20160035T1 (en) 2016-02-12
IN2014KN01357A (en) 2015-10-16
BR112014015689A2 (en) 2017-06-13

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