WO2001049435A1 - Improved method for making light alloy components - Google Patents

Improved method for making light alloy components Download PDF

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Publication number
WO2001049435A1
WO2001049435A1 PCT/FR2000/003703 FR0003703W WO0149435A1 WO 2001049435 A1 WO2001049435 A1 WO 2001049435A1 FR 0003703 W FR0003703 W FR 0003703W WO 0149435 A1 WO0149435 A1 WO 0149435A1
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WO
WIPO (PCT)
Prior art keywords
preform
casting
temperature
graphite
forging
Prior art date
Application number
PCT/FR2000/003703
Other languages
French (fr)
Inventor
Emile Di Serio
Original Assignee
Saint Jean Industries
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Filing date
Publication date
Application filed by Saint Jean Industries filed Critical Saint Jean Industries
Priority to AT00993697T priority Critical patent/ATE246063T1/en
Priority to EP00993697A priority patent/EP1250204B1/en
Priority to DE60004271T priority patent/DE60004271T2/en
Priority to JP2001549791A priority patent/JP5025870B2/en
Priority to CA002396043A priority patent/CA2396043C/en
Priority to AU28605/01A priority patent/AU771366B2/en
Publication of WO2001049435A1 publication Critical patent/WO2001049435A1/en
Priority to US10/180,878 priority patent/US20020166357A1/en

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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
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
    • B22D31/002—Cleaning, working on castings
    • 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
    • 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
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon

Definitions

  • the invention relates to the technical sector of the manufacture of parts in light alloy, in particular aluminum, obtained in foundry, forging and similar processes.
  • EP 119.365 discloses a specific process called COBAPRESS which combines . foundry and forging techniques for aluminum or aluminum alloy parts.
  • this process consists in casting aluminum or aluminum alloy in a mold and after casting, in demolding the still hot part called a preform at a temperature of the order of 400 ° C.
  • COBAPRESS 2 therefore makes it possible to significantly reduce the production time and the manufacturing cost of the parts, while obtaining the same characteristics of the parts compared to the teaching of the COBAPRESS process described in patent EP 1 19,365.
  • the spraying of the graphite solution on the forging die is an operation which, depending on the complexity of the shapes of the raw final part, is relatively long and costly, which does not systematically make it possible to have spraying homogeneity. in the parts of difficult access of the room, and finally which is very messy for the work station.
  • US Pat. No. 4,683,742 which provides for the preheating of the billets before applying to them a coating of graphite type, then the billets being then forged after passing through a drying installation.
  • the aim sought after according to the invention was therefore to ensure optimization of the initial COBAPRESS process of cast-forged light alloy.
  • a first step was to focus on improving the conditions for depositing graphite in the forging matrix by spraying the graphite solution on the forging matrix, with better control of the distribution using robots.
  • this solution is not very satisfactory, because it still requires human intervention, and the costs and environmental problems are still there.
  • the process for manufacturing the light alloy parts is of the type implementing the following phases: - casting of the preform at a temperature of the order of 250 ° to
  • the improved process for manufacturing light alloy parts is of the type implementing the following phases: - casting of preform at a temperature of the order of 250 ° to 500 ° C;
  • FIG. 1 represents the diagram of implementation of the method according to the invention.
  • the process for manufacturing light alloy parts according to the invention requires an installation with five successive specific zones covering the different stages of the process.
  • the first zone (Zl) corresponds to the casting of the light alloy in a mold (1) allowing a preform (2) to be obtained under the temperature conditions mentioned above.
  • the second zone (Z2) corresponds to the transfer of the heated preform (2) into a tank (3) for immersion and graphitation by coating the preform (2).
  • the bath is a solution of graphite and water.
  • a phase (Z3) of drying the preformed part outside the bath is provided.
  • the following zone (Z4) corresponds to the transfer of the dried graphite preform into the tunnel oven (4) for temperature homogenization.
  • the following zone (Z5) corresponds to the exit of the tunnel furnace of the preform to be then forged in a matrix (5) which is subject to less and faster lubrication limited to the bead bead according to the conditions mentioned above , then cooled to room temperature or accelerated or quenched.
  • the black color resulting from the graphite bath makes it possible to better store calories and therefore to improve the structural and mechanical characteristics of the part; -
  • a shade of color could meet a need for aesthetics and colors. Greater discretion for safety elements and more particularly suspension - chassis to avoid the shine effect under the body visible by the drivers next to the vehicle concerned.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Forging (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

The invention concerns a method for making alloy components characterised in that after casting the preform (2) and before transferring it into a forging matrix (5), said preform, still hot at the end of casting, is transferred and completely immersed in a vessel (3) for graphitization coating, then, on coming out of the vessel, the preform temperature enabling the water to be evaporated so that the preform is homogeneously coated with graphite.

Description

PROCEDE PERFECTIONNE POUR FABRIQUER DES PIECES EN IMPROVED PROCESS FOR MANUFACTURING PARTS IN
ALLIAGE LEGERLIGHT ALLOY
L'invention se rattache au secteur technique de la fabrication de pièces en alliage léger, notamment en aluminium, obtenues en fonderie, forgeage et procédés similaires.The invention relates to the technical sector of the manufacture of parts in light alloy, in particular aluminum, obtained in foundry, forging and similar processes.
On connaît, par le brevet EP 119.365, un procédé spécifique dénommé COBAPRESS qui combine . les techniques de fonderie et de forgeage de pièces en aluminium ou alliages d'aluminium.EP 119.365 discloses a specific process called COBAPRESS which combines . foundry and forging techniques for aluminum or aluminum alloy parts.
On rappelle que ce procédé consiste à couler de l'aluminium ou alliage d'aluminium dans un moule et après la coulée, à démouler la pièce encore chaude dénommée préforme à une température de l'ordre de 400°C àIt is recalled that this process consists in casting aluminum or aluminum alloy in a mold and after casting, in demolding the still hot part called a preform at a temperature of the order of 400 ° C.
500°C, on la place entre deux matrices ou parties d'une matrice définissant une empreinte de dimensions légèrement inférieures à celles du moule, qui correspondent à celles de la. pièce finale, les deux coquilles ou parties étant fortement pressées l'une contre l'autre pour exercer sur la préforme coulée mise entre les parties de matrices un effet combiné de pressage à cœur et de corroyage superficiel.500 ° C, it is placed between two matrices or parts of a matrix defining an imprint of dimensions slightly smaller than those of the mold, which correspond to those of the. final part, the two shells or parts being strongly pressed one against the other in order to exert on the casting preform placed between the parts of the dies a combined effect of core pressing and surface wrought.
On connaît par ailleurs, par le brevet FR 2.778.125, un procédé du type précité amélioré qui vise à profiter de l'opération de préchauffe pour réaliser en même temps l'opération de traitement thermique économisant ainsi sur l'opération de traitement thermique classique postérieure à l'opération de frappe. Entre la coulée de la préforme et le forgeage, on transfère ladite préforme coulée dans un four assurant la mise en solution de ladite préforme coulée à la température de mise en solution du matériau constitutif et placée ensuite entre les deux parties de la matrice de frappe pour l'opération de forgeage avec refroidissement ambiant, en accéléré ou trempé.We also know, from patent FR 2,778,125, a process of the aforementioned improved type which aims to take advantage of the preheating operation to simultaneously carry out the heat treatment operation thus saving on the conventional heat treatment operation after the typing operation. Between the casting of the preform and the forging, said cast preform is transferred to an oven ensuring the dissolution of said preform poured at the dissolution temperature of the constituent material and then placed between the two parts of the impact die for the forging operation with ambient cooling, accelerated or quenched.
Ce procédé amélioré dénommé COBAPRESS 2 permet donc de réduire le temps de production et le coût de fabrication de manière significative des pièces, tout en obtenant les mêmes caractéristiques des pièces par rapport à l'enseignement du procédé COBAPRESS décrit dans le brevet EP 1 19.365.This improved process called COBAPRESS 2 therefore makes it possible to significantly reduce the production time and the manufacturing cost of the parts, while obtaining the same characteristics of the parts compared to the teaching of the COBAPRESS process described in patent EP 1 19,365.
La mise en œuvre du procédé précité dans les deux versions requiert de manière courante dans l'activité de forgeage de pulvériser sur la matrice de forge une solution eau plus graphite à l'état liquide, qui a pour but de faciliter le fluage de la matière ainsi forgée et le démoulage de la pièce finale.The implementation of the aforementioned process in both versions commonly requires in the forging activity to spray on the forging matrix a water solution more graphite in liquid state, which aims to facilitate the creep of the material thus forged and the release of the final part.
En pratique, la pulvérisation de la solution graphite sur la matrice de forge est une opération qui, en fonction de la complexité des formes de la pièce finale brute, est relativement longue et coûteuse, qui ne permet pas systématiquement d'avoir une homogénéité de pulvérisation dans les parties d'accès difficile de la pièce, et enfin qui est très salissante pour le poste de travail.In practice, the spraying of the graphite solution on the forging die is an operation which, depending on the complexity of the shapes of the raw final part, is relatively long and costly, which does not systematically make it possible to have spraying homogeneity. in the parts of difficult access of the room, and finally which is very messy for the work station.
On connaît par ailleurs le brevet US 4683742 qui prévoit le préchauffage des billettes avant de leur appliquer un revêtement de type graphite puis les billettes étant forgées ensuite après passage dans une installation de séchage. Le but recherché selon l'invention était donc d'assurer une optimisation du procédé COBAPRESS initial de coulé-forgé en alliage léger.Furthermore, US Pat. No. 4,683,742 is known, which provides for the preheating of the billets before applying to them a coating of graphite type, then the billets being then forged after passing through a drying installation. The aim sought after according to the invention was therefore to ensure optimization of the initial COBAPRESS process of cast-forged light alloy.
On connaît aussi par le brevet JP 6005433 le forgeage de billettes avec utilisation d'un revêtement graphite.Also known from patent JP 6005433 is the forging of billets with the use of a graphite coating.
Face à l'ensemble de l'art antérieur précité, le demandeur a tenté d'optimiser le procédé du COBAPRESS tel que défini par les brevets antérieurs précités.Faced with all of the aforementioned prior art, the applicant has attempted to optimize the COBAPRESS process as defined by the aforementioned prior patents.
Une première démarche a été de s'orienter sur une amélioration des conditions de dépose du graphite dans la matrice de forgeage par pulvérisation de la solution de graphite sur la matrice de forge, avec un meilleur contrôle de la distribution à l'aide de robots. En pratique, cette solution est peu satisfaisante, car elle nécessite tout de même l'intervention de l'homme, et les coûts et problèmes environnementaux sont toujours là.A first step was to focus on improving the conditions for depositing graphite in the forging matrix by spraying the graphite solution on the forging matrix, with better control of the distribution using robots. In practice, this solution is not very satisfactory, because it still requires human intervention, and the costs and environmental problems are still there.
La démarche du demandeur s'est donc orientée de manière inattendue sur une autre possibilité qui s'intercale entre les deux phases principales de coulée et de forgeage, possibilité qui offre toutes les garanties dans une répartition homogène de la solution graphite sur la préforme, et qui au surplus apporte des caractéristiques particulières intéressantes, en améliorant la productivité du procédé.The applicant's approach was therefore unexpectedly oriented on another possibility which is inserted between the two main phases of casting and forging, a possibility which offers all the guarantees in a homogeneous distribution of the graphite solution on the preform, and which moreover provides interesting particular characteristics, by improving the productivity of the process.
Selon une première caractéristique, le procédé de fabrication des pièces en alliage léger est du type mettant en œuvre les phases suivantes : - coulage de la préforme à une température de l'ordre de 250° àAccording to a first characteristic, the process for manufacturing the light alloy parts is of the type implementing the following phases: - casting of the preform at a temperature of the order of 250 ° to
500°C, - transfert de la préforme chauffée dans une matrice définissant une empreinte de dimensions légèrement inférieures à celle du moule, les deux parties de la matrice étant pressées l'une contre l'autre pour exercer l'effort de forgeage, de matriçage de la pièce brute finale, - refroidissement de la pièce brute à la température ambiante, le procédé étant caractérisé en ce que après coulage de la préforme chauffée et avant le transfert de la préforme dans une matrice de forge, ladite préforme, à température de fin de coulée est transférée et immergée totalement dans un bac pour graphitage par enduction, pour autoriser le dépôt de la solution graphite sur la préforme, puis en sortie de bac, la température de la préforme permettant l'évaporation naturelle de l'eau de sorte que la préforme est recouverte d'une manière homogène de graphite.500 ° C, transfer of the heated preform into a matrix defining an imprint of dimensions slightly smaller than that of the mold, the two parts of the matrix being pressed one against the other to exert the forging effort, forging the blank final, - cooling of the blank to ambient temperature, the process being characterized in that after casting the heated preform and before transferring the preform into a forging die, said preform, at end of casting temperature, is transferred and completely submerged in a tray for graphitation by coating, to allow the deposition of the graphite solution on the preform, then at the outlet of the tray, the temperature of the preform allowing the natural evaporation of water so that the preform is covered homogeneously graphite.
Ainsi on a plus besoin de remettre la pièce en chauffe pour la tenue du produit de revêtement ni d'avoir un système pour faire évaporer l'eau, celle-ci étant naturelle.Thus, there is no longer any need to reheat the part to hold the coating product or to have a system for evaporating the water, the latter being natural.
Selon une autre caractéristique, le procédé, perfectionné de fabrication des pièces en alliage léger est du type mettant en œuvre les phases suivantes : - coulage de préforme à une température de l'ordre de 250° à 500°C ;According to another characteristic, the improved process for manufacturing light alloy parts is of the type implementing the following phases: - casting of preform at a temperature of the order of 250 ° to 500 ° C;
- transfert de la préforme coulée obtenue dans un four assurant la mise en solution de ladite préforme coulée à la température de mise en solution du matériau constitutif ;- Transfer of the casting preform obtained in an oven ensuring the dissolution of said casting preform at the dissolution temperature of the constituent material;
- transfert de la préforme mise en solution en sortie du four dans une matrice définissant une empreinte de dimensions légèrement inférieures à celles du moule, les parties de la matrice étant pressées l'une contre l'autre pour exercer l'effort de forgeage, de matriçage de la pièce brute finale ; - refroidissement de la pièce brute obtenue à la température ambiante, en accéléré ou trempé, le procédé étant caractérisé en ce que, après coulage de la préforme chauffée et avant le transfert dans le four tunnel, ladite préforme, à température de fin de coulée, est transférée et immergée totalement dans un bac pour graphitage par enduction, pour autoriser le dépôt de la solution graphite sur la préforme, puis en sortie de bac, à ce stade, la température de la préforme et celle du procédé en amont permettant l'évaporation naturelle de l'eau, de sorte que la préforme est recouverte d'une manière homogène de graphite, ladite pré forme étant ensuite remise en température dans le four tunnel assurant l'homogénéisation en température de la préforme graphitée.transfer of the preform dissolved in the outlet of the oven into a matrix defining an imprint of dimensions slightly smaller than those of the mold, the parts of the matrix being pressed one against the other to exert the forging effort, stamping of the final blank; - cooling of the raw part obtained at room temperature, accelerated or quenched, the process being characterized in that, after pouring the heated preform and before transfer to the tunnel oven, said preform, at the end of casting temperature, is transferred and completely immersed in a tray for graphitation by coating, to authorize the deposition of the graphite solution on the preform, then at the exit of the tray, at this stage, the temperature of the preform and that of the upstream process allowing evaporation natural water, so that the preform is covered in a homogeneous manner of graphite, said preform is then reheated in the tunnel oven ensuring the temperature homogenization of the graphite preform.
Ces caractéristiques et d'autres encore ressortiront bien de la suite de la description.These characteristics and others will become apparent from the following description.
Pour fixer l'objet de l'invention illustré d'une manière non limitative aux figures du dessin où la figure 1 représente le schéma de mise en œuvre du procédé selon l'invention.To fix the object of the invention illustrated in a nonlimiting manner in the figures of the drawing where FIG. 1 represents the diagram of implementation of the method according to the invention.
Le procédé de fabrication des pièces en alliage léger selon l'invention requiert une installation avec cinq zones spécifiques successives couvrant les différentes étapes du procédé.The process for manufacturing light alloy parts according to the invention requires an installation with five successive specific zones covering the different stages of the process.
La première zone (Zl) correspond à la coulée de l'alliage léger dans un moule (1) permettant l'obtention d'une pré forme (2) dans les conditions de température rappelées précédemment. La seconde zone (Z2) correspond au transfert de la préforme (2) chauffée dans un bac (3) pour immersion et graphitage par enduction de la préforme (2). Le bain est une solution de graphite et eau.The first zone (Zl) corresponds to the casting of the light alloy in a mold (1) allowing a preform (2) to be obtained under the temperature conditions mentioned above. The second zone (Z2) corresponds to the transfer of the heated preform (2) into a tank (3) for immersion and graphitation by coating the preform (2). The bath is a solution of graphite and water.
Adjacent au bac permettant le graphitage par enduction, ou dans son plan supérieur, est prévue une phase (Z3) de séchage de la pièce préformée hors du bain.Adjacent to the tray for graphitation by coating, or in its upper plane, a phase (Z3) of drying the preformed part outside the bath is provided.
La zone (Z4) suivante correspond au transfert de la préforme graphitée séchée dans le four tunnel (4) pour homogénéisation en température. La zone (Z5) suivante correspond à la sortie du four tunnel de la pré forme pour être ensuite forgée dans une matrice (5) qui fait l'objet d'une lubrification moindre et plus rapide limitée au cordon de bavure selon les conditions évoquées précédemment, puis refroidie à température ambiante ou accélérée ou trempée.The following zone (Z4) corresponds to the transfer of the dried graphite preform into the tunnel oven (4) for temperature homogenization. The following zone (Z5) corresponds to the exit of the tunnel furnace of the preform to be then forged in a matrix (5) which is subject to less and faster lubrication limited to the bead bead according to the conditions mentioned above , then cooled to room temperature or accelerated or quenched.
Le procédé optimisé selon l'invention apparaît donner aux pièces ainsi traitées des avantages spécifiques.The optimized process according to the invention appears to give the parts thus treated specific advantages.
Les avantages du procédé optimisé de l'invention sont nombreux .The advantages of the optimized method of the invention are numerous.
On profite de la température de la préforme pour permettre au graphite d'accrocher sur la préforme puis à l'eau de s'évaporer avant les opérations suivantes - une qualité d'état de surface plus affiné de la pièce grâce à une homogénisation du dépôt de solution graphite qui a une influence sur les conditions d'essai de rupture ;We take advantage of the preform temperature to allow the graphite to hang on the preform and then the water to evaporate before the following operations - a more refined surface finish quality of the part thanks to a homogenization of the graphite solution deposit which has an influence on the failure test conditions;
- une meilleure tenue en essai de fatigue ; - une longévité accrue de l'outillage de frappe- better resistance in fatigue test; - increased longevity of striking tools
- une amélioration de l'environnement ;- improvement of the environment;
- un gain de productivité ;- increased productivity;
- une formation humaine moindre et moins complexe, ce qui est important en regard du recrutement de main d'œuvre qualifié, ce qui est toujours difficile ou une automatisation plus simple ;- less and less complex human training, which is important with regard to the recruitment of qualified labor, which is always difficult or simpler automation;
- au moment de l' homogénisation en température dans le four tunnel pour homogénéisation en température, la couleur noire issue du bain graphité permet de mieux emmagasiner les calories et donc d'améliorer les caractéristiques de structure et mécaniques de la pièce ; - De plus, une nuance de couleur pourrait répondre à un besoin d'esthétique et de coloris. Une plus grande discrétion pour des éléments de sécurité et plus particulièrement de suspension - châssis pour éviter l'effet de brillance sous carrosserie visible par les conducteurs voisins au véhicule concerné.- at the time of temperature homogenization in the tunnel oven for temperature homogenization, the black color resulting from the graphite bath makes it possible to better store calories and therefore to improve the structural and mechanical characteristics of the part; - In addition, a shade of color could meet a need for aesthetics and colors. Greater discretion for safety elements and more particularly suspension - chassis to avoid the shine effect under the body visible by the drivers next to the vehicle concerned.
Les avantages sont donc nombreux. Le procédé est optimisé selon l'invention et apporte des améliorations inattendues et récentes qui justifient son développement. The advantages are therefore numerous. The method is optimized according to the invention and provides unexpected and recent improvements which justify its development.

Claims

R E V E N D I C A T I O N S R E V E N D I C A T I O N S
-1- Procédé de fabrication des pièces en alliage léger du type mettant en œuvre les phases suivantes :-1- Process for manufacturing light alloy parts of the type using the following phases:
- coulage de la préforme à une température de l'ordre de 250° à 500°C ;- casting the preform at a temperature of the order of 250 ° to 500 ° C;
- transfert de la préforme dans une matrice définissant une empreinte de dimensions légèrement inférieures à celle du moule, les parties de la matrice de forge, étant pressées l'une contre l'autre pour exercer l'effort de forgeage, de matriçage de la pièce brute finale ;transfer of the preform into a matrix defining an imprint of dimensions slightly smaller than that of the mold, the parts of the forging matrix being pressed one against the other to exert the forging and forging force of the part final gross;
- refroidissement de la pièce brute à la température ambiante, le procédé étant caractérisé en ce qu'après coulage de la préforme chauffée et avant le transfert de la préforme dans une matrice de forge, ladite préforme, à température de fin de coulée est transférée et immergée totalement dans un bac pour graphitage pour enduction, pour autoriser le dépôt de la solution graphite sur la préforme puis en sortie de bac, la température de la préforme permettant l'évaporation naturelle de l'eau de sorte que la préforme est recouverte d'une manière homogène de graphite.cooling the blank to ambient temperature, the process being characterized in that after casting the heated preform and before transferring the preform into a forging die, said preform, at the end of casting temperature, is transferred and fully submerged in a graphitation tank for coating, to allow the graphite solution to be deposited on the preform and then at the tank outlet, the temperature of the preform allowing the natural evaporation of water so that the preform is covered with a homogeneous way of graphite.
-2- Procédé perfectionné de fabrication des pièces en alliage léger est du type mettant en œuvre les phases suivantes :-2- An improved process for manufacturing light alloy parts is of the type implementing the following phases:
- coulage de préforme à une température de l'ordre de 250° à 500°C ;- casting of preform at a temperature of the order of 250 ° to 500 ° C;
- transfert de la préforme coulée obtenue dans un four assurant la mise en solution de ladite préforme coulée à la température de mise en solution du matériau constitutif ;- Transfer of the casting preform obtained in an oven ensuring the dissolution of said casting preform at the dissolution temperature of the constituent material;
- transfert de la préforme mise en solution en sortie du four dans une matrice définissant une empreinte de dimensions légèrement inférieures à celles du moule, les deux parties de la matrice étant pressées l'une contre l'autre pour exercer l'effort de forgeage, de matriçage de la pièce brute finale;- transfer of the preform dissolved in the outlet of the oven into a matrix defining an imprint of dimensions slightly less than those of the mold, the two parts of the die being pressed one against the other to exert the forging effort, forging the final blank;
- refroidissement de la pièce brute obtenue à la température ambiante, en accéléré ou trempé, le procédé étant caractérisé en ce que, après coulage de la préforme et avant le transfert dans le four, ladite préforme, à température en fin de coulée, est transférée et immergée totalement dans un bac pour graphitage par enduction, pour autoriser le dépôt de la solution graphite sur la préforme puis en sortie de bac, la température de la préforme et. celle du procédé en amont permettant l'évaporation naturelle de l'eau, elle est séchée, de sorte que la pré forme est recouverte d'une manière homogène de graphite, ladite préforme étant transférée dans le four assurant la mise en solution de la préforme graphitée.- cooling of the raw part obtained at room temperature, accelerated or quenched, the process being characterized in that, after casting the preform and before transfer to the furnace, said preform, at temperature at the end of casting, is transferred and completely immersed in a tray for graphitation by coating, to allow the deposition of the graphite solution on the preform and then at the outlet of the tray, the temperature of the preform and. that of the upstream process allowing the natural evaporation of the water, it is dried, so that the preform is covered in a homogeneous manner with graphite, said preform being transferred into the oven ensuring the dissolution of the preform graphite.
-3- Procédé selon l'une quelconque des revendications 1 et 2, caractérisé en ce qu'on introduit dans le bac pour graphitage par enduction une nuance de couleur du bain.-3- A method according to any one of claims 1 and 2, characterized in that introduced into the tray for graphitation by coating a shade of bath color.
-4- Installation pour la mise en œuvre du procédé selon l'une quelconque des revendications 1 à 3, caractérisée en ce qu'elle comprend 5 zones successives à savoir :-4- Installation for implementing the method according to any one of claims 1 to 3, characterized in that it comprises 5 successive areas, namely:
- une première zone (Zl) correspondant à la coulée de l'alliage dans un moule (1) permettant l'obtention d'une pré forme (2) ;- A first zone (Zl) corresponding to the casting of the alloy in a mold (1) allowing obtaining a preform (2);
- une seconde zone (Z2) correspondant au transfert de la préforme (2) dans un bac (3) par immersion et graphitage par enduction de la préforme (2) ;- A second zone (Z2) corresponding to the transfer of the preform (2) into a tank (3) by immersion and graphitation by coating the preform (2);
- une étape (Z3) de séchage de la pièce préformée (2) hors du bain graphité se trouvant dans le bac (3) ; - une quatrième zone (Z4) de transfert de la préforme séchée dans un four tunnel (4) avec homogénisation en température ;- A step (Z3) of drying the preformed part (2) out of the graphite bath located in the tank (3); - A fourth zone (Z4) for transferring the dried preform into a tunnel oven (4) with temperature homogenization;
- une cinquième zone (Z5) correspondant à la sortie du four tunnel (4) de la préforme pour être forgée dans une matrice (5) puis refroidie à température ambiante ou accélérée ou trempée. - A fifth zone (Z5) corresponding to the exit of the tunnel oven (4) of the preform to be forged in a die (5) then cooled to room temperature or accelerated or quenched.
PCT/FR2000/003703 1999-12-29 2000-12-27 Improved method for making light alloy components WO2001049435A1 (en)

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AT00993697T ATE246063T1 (en) 1999-12-29 2000-12-27 METHOD FOR PRODUCING LIGHT METAL ALLOY COMPONENTS
EP00993697A EP1250204B1 (en) 1999-12-29 2000-12-27 Method for making light alloy components
DE60004271T DE60004271T2 (en) 1999-12-29 2000-12-27 METHOD FOR PRODUCING LIGHT METAL ALLOY COMPONENTS
JP2001549791A JP5025870B2 (en) 1999-12-29 2000-12-27 Improved method for manufacturing light alloy parts
CA002396043A CA2396043C (en) 1999-12-29 2000-12-27 Improved method for making light alloy components
AU28605/01A AU771366B2 (en) 1999-12-29 2000-12-27 Improved method for making light alloy components
US10/180,878 US20020166357A1 (en) 1999-12-29 2002-06-26 Method for making light alloy components

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FR9916831A FR2803232B1 (en) 1999-12-29 1999-12-29 IMPROVED PROCESS FOR MANUFACTURING LIGHT ALLOY PARTS
FR99/16831 1999-12-29

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AT (1) ATE246063T1 (en)
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FR2803232A1 (en) 2001-07-06
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CA2396043C (en) 2009-04-21
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AU2860501A (en) 2001-07-16
FR2803232B1 (en) 2002-04-26
ATE246063T1 (en) 2003-08-15
EP1250204B1 (en) 2003-07-30
CN1221348C (en) 2005-10-05
CA2396043A1 (en) 2001-07-12
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EP1250204A1 (en) 2002-10-23
JP2003527966A (en) 2003-09-24
JP5025870B2 (en) 2012-09-12
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US20020166357A1 (en) 2002-11-14
KR100730711B1 (en) 2007-06-21

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