EP1375026B1 - Casted forged parts without ejectortraces - Google Patents

Casted forged parts without ejectortraces Download PDF

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Publication number
EP1375026B1
EP1375026B1 EP03356082A EP03356082A EP1375026B1 EP 1375026 B1 EP1375026 B1 EP 1375026B1 EP 03356082 A EP03356082 A EP 03356082A EP 03356082 A EP03356082 A EP 03356082A EP 1375026 B1 EP1375026 B1 EP 1375026B1
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EP
European Patent Office
Prior art keywords
preform
zones
forging
burr
ejection
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.)
Expired - Lifetime
Application number
EP03356082A
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German (de)
French (fr)
Other versions
EP1375026A3 (en
EP1375026A2 (en
Inventor
Emile Thomas Di Serio
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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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
    • B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/08—Accessories for handling work or tools
    • B21J13/14—Ejecting devices
    • 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
    • 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

Definitions

  • the invention relates to the technical sector of the foundry and forging of aluminum or alloy parts relating thereto.
  • ejectors In known manner, to release a casting from its mold, ejectors are used. To remove a forged piece from its forge die, ejectors are also used.
  • the purpose of the invention was to obviate these disadvantages.
  • the method aims at displacing the receiving zones of the ejectors out of the body of the preform considered, by implanting them on the lateral peripheral edge of the preform, in unsolicited zones, and in that during the forging phase, these areas allowing the ejection are found in the burr of the forged part and are cut and thus evacuated, along with the burr.
  • FIG. 6 a preform (2) of a part obtained by casting aluminum or aluminum alloy castings.
  • This preform is of any shape and size in order to meet the conditions of use and application of the part resulting from said preform.
  • said preform (2) has along its lateral peripheral edge (2a), and externally of the part to be produced, one or more continuous or spaced projecting zones (2b) which are capable of constituting support planes thrust contact of a set of ejectors for the lifting of the preform out of its matrix.
  • the one or more projecting zones (2b) may constitute complementary appendices. This or these protruding zones are placed in non-stressed zones, so that there is no risk of stress concentration in these zones.
  • said areas (2b) for ejection of the preform are found in the burr of the forging and are cut at the same time as the burr. Moreover, since the receiving zones of the ejectors are located outside the preform and the final part, this makes it possible to improve the stability of the latter during the extraction of the impression and its transfer. .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Materials For Medical Uses (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

Ejection of workpieces obtained by casting and forging of light metals, e.g., aluminum and its alloys, involves moving the receiving areas of the ejector pins from the body of the preform (2) to the side peripheral edge. During forging, the zones allowing ejection of the preform are (2b) located in the burr of the forged workpiece and are cut and removed at the same time as the burr. Preferred Features: Along the side peripheral edge of the preform and outside the piece to be produced, there are one or more continuous or spaced projecting zones that can constitute base planes that can make contact with an ejector pin assembly for lifting the preform out of its die. The invented process is applied in a COBAPRESS procedure (outlined in EP119365A) involving successive operations of casting and forging of workpieces.

Description

L'invention se rattache au secteur technique de la fonderie et du forgeage de pièces en aluminium ou alliage s'y rapportant..The invention relates to the technical sector of the foundry and forging of aluminum or alloy parts relating thereto.

Le déposant exploite le procédé dit COBAPRESS ™ tel que défini dans le brevet européen n° 119365 , procédé qui met en oeuvre la réalisation de préformes obtenues par coulage de fonderie et qui sont ensuite transférées pour une opération de forgeage; ce procédé est défini dans le préambule de la revendication 1.The applicant exploits the so-called COBAPRESS ™ process as defined in European patent no. 119365 process which implements the production of preforms obtained by foundry casting and which are then transferred for a forging operation; this process is defined in the preamble of claim 1.

Ce procédé COBAPRESS ™ a fait l'objet de différents développements dont le déposant assure l'exploitation.This COBAPRESS ™ process has been the subject of various developments of which the depositor ensures the exploitation.

De manière connue, pour sortir une pièce de fonderie de son moule, on utilise des éjecteurs. Pour sortir une pièce forgée de sa matrice de forge, on utilise aussi des éjecteurs.In known manner, to release a casting from its mold, ejectors are used. To remove a forged piece from its forge die, ejectors are also used.

Selon le procédé du coulé-forgé dit COBAPRESS TM, l'obtention de préformes nécessite d'assurer la prise en charge de celles-ci et leur transfert vers l'outil de forge. Pour cela, selon l'art antérieur, les préformes sont agencées avec des zones spécifiques permettant le positionnement d'éjecteurs. Il s'agit d'outils vérins qui sont mus par des moyens mécaniques ou hydrauliques ou électriques et qui permettent l'extraction de la pièce moulée de son empreinte située dans le moule ainsi que le soulèvement de la préforme forgée avec sa bavure hors des demi-empreintes de la matrice de forge. Les zones spécifiques précitées se trouvent disposées sur le corps de la préforme. Cela entraîne un certain nombre d'inconvénients qui sont les suivants :

  • La trace d'éjecteur sur la pièce peut être intempestivement ou accidentellement et aléatoirement en creux s'il est trop long ou déformé par la dilatation. On a ainsi un manque matière sur la préforme à cet endroit.
  • La trace d'éjecteur peut être en relief s'il est trop court. On a ainsi un excès de matière à cet endroit.
  • L'éjecteur peut être usé et ceci entraîne la formation d'une bavure en relief sur la pièce. Cette bavure une fois forgée peut faire une amorce de rupture.
On a représenté aux figures 1 et 2 respectivement un petit bout de bavure qu'il reste sur la pièce, et cette même bavure créant un repli sur la pièce forgée.According to the cast-forged process known as COBAPRESS TM , the obtaining of preforms requires to take care of them and their transfer to the forging tool. For this, according to the prior art, the preforms are arranged with specific areas for the positioning of ejectors. These are cylindrical tools that are moved by mechanical or hydraulic or electrical means and that allow the extraction of the molded part of its footprint located in the mold and the lifting of the preform forged with its burr out of the half -prints of the forge matrix. The aforementioned specific areas are located on the body of the preform. This entails a number of disadvantages which are:
  • The ejector trace on the part may be accidentally or accidentally and randomly indented if it is too long or deformed by the expansion. There is thus a lack of material on the preform at this location.
  • The ejector trace may be embossed if it is too short. There is an excess of material at this point.
  • The ejector may be worn and this causes the formation of a raised burr on the part. This burr once forged can make a breakthrough.
Representatives Figures 1 and 2 respectively a small piece of burr remaining on the piece, and this same burr creating a fold on the forged part.

En ayant des éjecteurs sur la préforme, on peut en fait avoir un ensemble de risques de défaut d'éjecteur sur la préforme qui sont autant de risques de concentration de contraintes et rupture potentielle sur la géométrie finale après forgeage lors de sa sollicitation mécanique par l'utilisateur.By having ejectors on the preform, one can in fact have a set of risks of ejector defect on the preform which are as many risks of concentration of stresses and potential rupture on the final geometry after forging during its mechanical stressing. 'user.

D'autre part, en fonction de la configuration dimensionnelle de la préforme, il peut y avoir, selon l'art antérieur, une difficulté à trouver des zones réceptrices des éjecteurs. Il faut savoir qu'une limitation du nombre de ces zones peut focaliser les efforts d'éjection dépassant localement la résistance de la matière à chaud et entraîner un arrachement sur la préforme ou encore une déformation de la préforme lors de son éjection-extraction de l'empreinte qui peut poser un problème de mise en place dans la matrice, voire créer les conditions favorables à un défaut pendant la phase de forgeage ultérieur.On the other hand, depending on the dimensional configuration of the preform, there may be, according to the prior art, a difficulty in finding receiving zones of the ejectors. It should be known that a limitation of the number of these zones can focus the ejection efforts locally exceeding the resistance of the hot material and cause tearing on the preform or a deformation of the preform during its ejection-extraction of the preform. imprint that can pose a problem of implementation in the matrix, or even create favorable conditions for a defect during the subsequent forging phase.

Le but recherché selon l'invention était d'obvier à ces inconvénients.The purpose of the invention was to obviate these disadvantages.

Selon les revendications, le procédé vise à déporter les zones réceptrices des éjecteurs hors du corps de la préforme considérée, en les implantant sur la bordure périphérique latérale de la préforme, en des zones non sollicitées, et en ce que pendant la phase de forgeage, ces zones permettant l'éjection se retrouvent dans la bavure de la pièce forgée et sont découpées et donc évacuées, en même temps que la bavure.According to the claims, the method aims at displacing the receiving zones of the ejectors out of the body of the preform considered, by implanting them on the lateral peripheral edge of the preform, in unsolicited zones, and in that during the forging phase, these areas allowing the ejection are found in the burr of the forged part and are cut and thus evacuated, along with the burr.

Ces caractéristiques et d'autres encore ressortiront bien de la suite de la description.These and other characteristics will be apparent from the rest of the description.

Pour fixer l'objet de l'invention illustré d'une manière non limitative aux figures des dessins où :

  • La figure 1 est une vue de détail illustrant, selon l'art antérieur, un petit bout de bavure qu'il reste sur la préforme.
  • La figure 2 est une vue de détail illustrant, selon l'art antérieur, un petit bout de bavure qu'il reste sur la préforme.
  • La figure 3 est une vue d'une préforme, selon l'art antérieur, avec positionnement des zones d'éjection, dans la mise en oeuvre du procédé coulé / forgé de pièces en aluminium ou alliage aluminium dit COBAPRESS ™.
  • La figure 4 est une vue d'une préforme selon l'invention, avec positionnement des zones d'éjection en bordure périphérique.
  • La figure 5 est une vue, selon la figure 4, de la pièce obtenue après forgeage.
  • La figure 6 représente une préforme d'une pièce obtenue par coulage de fonderie.
  • La figure 7 illustre une zone d'éjection de la préforme après forgeage lorsque la face latérale de la pièce est usinée.
  • La figure 8 illustre la zone d'éjection de la préforme après forgeage lorsque la face latérale de la pièce reste brute.
For fixing the object of the invention illustrated in a nonlimiting manner to the figures of the drawings where:
  • The figure 1 is a detail view illustrating, according to the prior art, a small piece of burr remaining on the preform.
  • The figure 2 is a detail view illustrating, according to the prior art, a small piece of burr remaining on the preform.
  • The figure 3 is a view of a preform, according to the prior art, with positioning of the ejection zones, in the implementation of the cast / forged process of aluminum parts or aluminum alloy said COBAPRESS ™.
  • The figure 4 is a view of a preform according to the invention, with positioning of the ejection zones at the peripheral edge.
  • The figure 5 is a view, according to the figure 4 , of the piece obtained after forging.
  • The figure 6 represents a preform of a piece obtained by foundry casting.
  • The figure 7 illustrates an ejection zone of the preform after forging when the lateral face of the part is machined.
  • The figure 8 illustrates the ejection zone of the preform after forging when the lateral face of the part remains rough.

Afin de rendre plus concret l'objet de l'invention, on le décrit maintenant d'une manière non limitative illustrée aux figures des dessins.In order to make the object of the invention more concrete, it is now described in a nonlimiting manner illustrated in the figures of the drawings.

On a représenté figure 6 une préforme (2) d'une pièce obtenue par coulage de fonderie en aluminium ou alliage aluminium. Cette préforme est de forme et dimensions quelconques en vue de répondre aux conditions d'utilisation et d'application de la pièce découlant de ladite préforme.We have shown figure 6 a preform (2) of a part obtained by casting aluminum or aluminum alloy castings. This preform is of any shape and size in order to meet the conditions of use and application of the part resulting from said preform.

Selon l'invention, ladite préforme (2) présente le long de sa bordure périphérique latérale (2a), et de façon externe de la pièce à produire, une ou des zones en saillie (2b) continues ou espacées qui sont susceptibles de constituer des plans d'appui contact de poussée d'un ensemble d'éjecteurs pour le soulèvement de la préforme hors de sa matrice.According to the invention, said preform (2) has along its lateral peripheral edge (2a), and externally of the part to be produced, one or more continuous or spaced projecting zones (2b) which are capable of constituting support planes thrust contact of a set of ejectors for the lifting of the preform out of its matrix.

La ou lesdites zones en saillie (2b) peuvent constituer des appendices complémentaires. Cette ou ces zones en saillie sont mises dans des zones hors contraintes, de sorte qu'il n'y a pas de risque de concentration de contraintes dans ces zones.The one or more projecting zones (2b) may constitute complementary appendices. This or these protruding zones are placed in non-stressed zones, so that there is no risk of stress concentration in these zones.

Pendant la phase de forgeage, lesdites zones (2b) permettant l'éjection de la préforme se retrouvent dans la bavure de la pièce forgée et sont découpées en même temps que la bavure.
Par ailleurs, du fait que les zones réceptrices des éjecteurs se situent à l'extérieur de la préforme et de la pièce définitive, cela permet d'améliorer la stabilité de celle-ci lors de l'extraction de l'empreinte et de son transfert.During the forging phase, said areas (2b) for ejection of the preform are found in the burr of the forging and are cut at the same time as the burr.
Moreover, since the receiving zones of the ejectors are located outside the preform and the final part, this makes it possible to improve the stability of the latter during the extraction of the impression and its transfer. .

On a représenté figure 7 la zone d'éjection de cette préforme après forgeage dans le cas où la face latérale de la pièce est usinée et le dégagement de la bavure (2d).We have shown figure 7 the ejection zone of this preform after forging in the case where the lateral face of the part is machined and the release of the burr (2d).

On a représenté figure 8, la zone d'éjection de cette préforme après forgeage dans le cas où la face latérale de la pièce reste brute et le dégagement de bavure (2d). Le pincement qui est conçu permet un meilleur découpage de l'éjecteur et de sa bavure (2e) après forgeage.
L'éjecteur est pincé et repoussé au moment de la frappe en même temps que la bavure ce qui fait que l'éjecteur est détouré en même temps que la bavure.We have shown figure 8 , the ejection zone of this preform after forging in the case where the lateral face of the piece remains raw and the flash clearance (2d). The pinch that is designed allows a better cutting of the ejector and its burr (2nd) after forging.
The ejector is pinched and pushed back at the same time as the burr that makes the ejector is cut off at the same time as the burr.

La solution ainsi apportée dans la mise en oeuvre du procédé COBAPRESSTM des pièces en aluminium ou alliage permet de fiabiliser le procédé. On n'a jamais de risque potentiel lié à des problèmes sur les traces d'impacts d'éjecteurs dès la fonderie qui peuvent créer des problèmes sur la pièce forgée et être une amorce de rupture.The solution thus provided in the implementation of the COBAPRESS TM process of aluminum or alloy parts makes the process more reliable. There is never a potential risk associated with problems with ejector strikes from the foundry that can create problems on the forgings and be a breakthrough.

Claims (3)

  1. Method for ejecting parts obtained by casting forging of aluminium or alloy parts, characterized in that it consists in floating the receiving zones of the ejectors outside the body of the preform concerned, by implanting them on the lateral peripheral border (2a) of the preform, and in that during the forging phase, the said zones (2b) for ejecting from the preform are found in the burr of the forged part and are cut and removed at the same time as the burr.
  2. Method according to Claim 1, characterized in that the said preform (2) has, along its lateral peripheral border (2a) and externally to the part to be produced, one or more continuous or spaced projecting zones (2b) which are suitable for constituting thrust contact bearing planes (2c) of a set of ejectors for lifting the preform out of its die.
  3. Method according to Claim 2, characterized in that the said projecting zone or zones (2b) consist of appendages.
EP03356082A 2002-05-31 2003-05-27 Casted forged parts without ejectortraces Expired - Lifetime EP1375026B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0206873 2002-05-31
FR0206873A FR2840242B1 (en) 2002-05-31 2002-05-31 FORGED CASTLES WITHOUT TRACES OF EJECTORS

Publications (3)

Publication Number Publication Date
EP1375026A2 EP1375026A2 (en) 2004-01-02
EP1375026A3 EP1375026A3 (en) 2006-05-24
EP1375026B1 true EP1375026B1 (en) 2008-08-13

Family

ID=29558965

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03356082A Expired - Lifetime EP1375026B1 (en) 2002-05-31 2003-05-27 Casted forged parts without ejectortraces

Country Status (5)

Country Link
EP (1) EP1375026B1 (en)
AT (1) ATE404306T1 (en)
DE (1) DE60322787D1 (en)
ES (1) ES2310646T3 (en)
FR (1) FR2840242B1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2233267A1 (en) * 1971-07-09 1973-01-25 Marshall Fowler Ltd Forging press - arranged for overspill utilisation
EP0119365B1 (en) * 1983-03-14 1987-09-02 Thomas Di Serio Method of producing pieces of aluminium or aluminium alloy
DE3323359C2 (en) * 1983-06-29 1986-11-20 Belzer-Dowidat Gmbh Werkzeug-Union, 5600 Wuppertal Process for the production of forgings with auxiliary bodies for the automated handling of the forgings
JPS60250840A (en) * 1984-05-28 1985-12-11 Daido Steel Co Ltd Taking out device for forging

Also Published As

Publication number Publication date
FR2840242B1 (en) 2005-01-07
FR2840242A1 (en) 2003-12-05
ATE404306T1 (en) 2008-08-15
EP1375026A3 (en) 2006-05-24
EP1375026A2 (en) 2004-01-02
ES2310646T3 (en) 2009-01-16
DE60322787D1 (en) 2008-09-25

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