EP1502676A1 - Potassium borate foundry core with dissolution cavity - Google Patents

Potassium borate foundry core with dissolution cavity Download PDF

Info

Publication number
EP1502676A1
EP1502676A1 EP04300450A EP04300450A EP1502676A1 EP 1502676 A1 EP1502676 A1 EP 1502676A1 EP 04300450 A EP04300450 A EP 04300450A EP 04300450 A EP04300450 A EP 04300450A EP 1502676 A1 EP1502676 A1 EP 1502676A1
Authority
EP
European Patent Office
Prior art keywords
core
mold
cavity
dissolution
molding
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.)
Granted
Application number
EP04300450A
Other languages
German (de)
French (fr)
Other versions
EP1502676B1 (en
Inventor
André LE NEZET
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.)
Renault SAS
Original Assignee
Renault SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP1502676A1 publication Critical patent/EP1502676A1/en
Application granted granted Critical
Publication of EP1502676B1 publication Critical patent/EP1502676B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores
    • B22C9/105—Salt cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/06—Core boxes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/002—Removing cores by leaching, washing or dissolving

Definitions

  • the invention relates to a core for the production of foundry hollow forms, a mold and a method for realization of such a core.
  • the invention relates more particularly to a core for the creation of hollow shapes by casting, obtained by molding a casting of molten mineral salts in a mold.
  • Document 2.819.205 describes and represents such a core containing inorganic salts such as metaborate or potassium monoborate, potassium diborate, triborate of potassium, potassium tetraborate, or potassium pentaborate.
  • Such a core is compatible with foundry processes under pressure, for the realization of hollow forms of fine geometries, and compatible with all types of alloys used in these processes.
  • It can be used in a foundry process under pressure, but it can also be used in a process of foundry with gravity casting, with a view to improving the state of cavities surface and in order to make cavities of more complex geometries, compared to a foundry process with gravity casting using a sand-based core or classic mineral salts.
  • any nucleus must be removed from the raw demolding in order to use and / or machine said part.
  • This phenomenon is opposed to a rapid dissolution of the kernel, and thereby increases the duration during which the coin coming from foundry is immobilized pending dissolution of his or her nuclei.
  • the invention proposes a core of the type described above comprising means intended to promote the penetration of water into the core and therefore, to accelerate its dissolution.
  • the invention proposes a core of the type described previously, characterized in that it comprises a cavity interior intended to allow, after use of the core for the making a casting, to a solvent to have access to capillarity in the heart of the nucleus in order to accelerate its dissolution.
  • the invention also relates to a method for producing a nucleus of the type previously described, of the type least one molding operation of the core, characterized in that the molding operation is followed by an operation of rapid cooling of the outer surface of the core.
  • the invention also relates to a mold for the production a core having cooling means arranged at near the wall of the mold cavity.
  • this one has internal heating means.
  • FIG. 1 shows a molding operation in cluster of two cores 10 for the realization of a piece of foundry of the type of the piece 12 which has been shown in FIGS. 2 and 3.
  • a casting of mineral salts is carried out in melting in a feed funnel 14 of a mold 16.
  • the feed funnel communicates at its lower end with an impression 18 of the mold 16.
  • At least a part of the mineral salts is chosen by example among potassium borates to obtain a nucleus 10 having high mechanical characteristics.
  • the mineral salts are distributed by gravity in the footprint 18 of the mold 16 according to the arrows "F" to form, after cooling, the core 12.
  • a casting 12 having a hollow shape 20 is obtained by an operation molding with the core 10 previously obtained.
  • the form hollow 20 is complementary to the core 10, and it is necessary to be able to exploit this hollow form 20 to dissolve the core 10 using a solvent, for example water in the case of a core 10 according to the invention comprising salts based on potassium borate.
  • the dissolution operation of the core 10 is a long operation which, in the case of a large production series, generates high capital costs in the workshop where is made the dissolution of the nuclei 10.
  • the invention proposes a core 10 having a interior cavity 26 intended, after use of the core 10 for the making a casting part 12, to allow a solvent to have access by capillarity to the core of the core 10 in order to accelerate the dissolution in the room 12.
  • the solvent enters the cavity 26 as shown in FIG. and propagates from the inside to the outside of the nucleus according to various directions 28 represented by the arrows in FIG.
  • the inner cavity 26 is performed during the molding operation of the core 10.
  • the cavity 10 could, without limitation, the invention, to be carried out by drilling or by introducing, prior to molding the core, a temperature element higher melting point than potassium borate salts, element that would be removed from core 10 prior to the operation of dissolution of the core 10 to form the cavity 26.
  • the cavity 26 consists of an internal shrinkage of the core obtained thanks to a rapid cooling of the surface outer 28 of the core 10 during its molding.
  • a method of manufacturing the core 10 comprises at least one molding operation such that previously mentioned with reference to Figure 1, followed by a rapid cooling operation of the outer surface 28 of the core 10.
  • the mold 16 has cooling means arranged nearby of the wall of the cavity 18 of the mold 16,
  • Such exchangers 34 are distributed according to the entire periphery of the footprint 18, to ensure cooling fast and uniform impression 18.
  • the method may comprise a preliminary operation of heating the mold 16 so as to reduce the initial difference temperature between the mineral salts and the mold 16.
  • the mold 16 comprises internal means of heating 38, for example one or more resistors 40 housed in the mold 16 and intended (s) to allow its temperature rise in a uniform way.
  • the invention thus makes it possible to produce salt cores Potassium borate-based minerals that have the particularity to be quickly dissolvable, which reduces costs and the production times of molded parts 12 with such nuclei.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

A core (10) for the production of hollow foundry moulds, obtained by the moulding of a cast of molten mineral salts in a mould (16), incorporates an inner cavity designed to allow a solvent to have access by capillary action to the heart of the core in order to accelerate the dissolution in the component after usage of the core. Independent claims are also included for: (a) the fabrication of this core; (b) a mould for the production of this core.

Description

L'invention concerne un noyau pour la réalisation de formes creuses par fonderie, un moule et un procédé pour la réalisation d'un tel noyau.The invention relates to a core for the production of foundry hollow forms, a mold and a method for realization of such a core.

L'invention concerne plus particulièrement un noyau pour la réalisation de formes creuses par fonderie, obtenu par moulage d'une coulée de sels minéraux en fusion dans un moule.The invention relates more particularly to a core for the creation of hollow shapes by casting, obtained by molding a casting of molten mineral salts in a mold.

Le document 2.819.205 décrit et représente un tel noyau comportant des sels minéraux tels que du métaborate ou monoborate de potassium, du diborate de potassium, du triborate de potassium, du tétraborate de potassium, ou encore du pentaborate de potassium.Document 2.819.205 describes and represents such a core containing inorganic salts such as metaborate or potassium monoborate, potassium diborate, triborate of potassium, potassium tetraborate, or potassium pentaborate.

Un tel noyau est compatible avec les procédés de fonderie sous pression, pour la réalisation de formes creuses de géométries fines, et compatible avec tous les types d'alliages légers utilisés dans ces procédés.Such a core is compatible with foundry processes under pressure, for the realization of hollow forms of fine geometries, and compatible with all types of alloys used in these processes.

Il permet notamment de réaliser des pièces comportant des formes creuses de géométries complexes et présentant un bon état de surface, tout en garantissant la propreté des cavités.It makes it possible, in particular, to produce parts comprising hollow shapes of complex geometries and presenting a good surface condition, while ensuring the cleanliness of the cavities.

Il peut être utilisé dans un procédé de fonderie sous pression, mais il peut aussi être utilisé dans un procédé de fonderie avec coulée par gravité, en vue d'améliorer l'état de surface des cavités et en vue de réaliser des cavités de géométries plus complexes, par rapport à un procédé de fonderie avec coulée par gravité utilisant un noyau à base de sable ou de sels minéraux classiques.It can be used in a foundry process under pressure, but it can also be used in a process of foundry with gravity casting, with a view to improving the state of cavities surface and in order to make cavities of more complex geometries, compared to a foundry process with gravity casting using a sand-based core or classic mineral salts.

A l'issue du moulage d'une pièce de fonderie à l'aide d'un tel noyau, un noyau, quel qu'il soit, doit être ôté de la pièce brute de démoulage afin de pouvoir utiliser et/ou usiner ladite pièce.After the casting of a casting with the aid of a such a nucleus, any nucleus, must be removed from the raw demolding in order to use and / or machine said part.

Dans le cas particulier des noyaux du type décrit précédemment qui se dissolvent à l'eau, on a constaté que la dissolution du noyau s'opérait selon un front de dissolution s'étendant d'une extrémité du noyau, par laquelle l'eau est acheminée, à l'extrémité opposée du noyau.In the particular case of the nuclei of the type described previously dissolving with water, it has been found that the dissolution of the nucleus operated according to a front of dissolution extending from one end of the core, through which water is routed to the opposite end of the core.

Ce phénomène s'oppose à une dissolution rapide du noyau, et augmente de ce fait la durée pendant laquelle la pièce venant de fonderie est immobilisée dans l'attente de la dissolution de son ou ses noyaux.This phenomenon is opposed to a rapid dissolution of the kernel, and thereby increases the duration during which the coin coming from foundry is immobilized pending dissolution of his or her nuclei.

Pour remédier à cet inconvénient, l'invention propose un noyau du type décrit précédemment comportant des moyens destinés à favoriser la pénétration de l'eau dans le noyau et par conséquent, à accélérer sa dissolution.To remedy this drawback, the invention proposes a core of the type described above comprising means intended to promote the penetration of water into the core and therefore, to accelerate its dissolution.

Dans ce but, l'invention propose un noyau du type décrit précédemment, caractérisé en ce qu'il comporte une cavité intérieure destinée à permettre, après usage du noyau pour la réalisation d'une pièce de fonderie, à un solvant d'avoir accès par capillarité au coeur du noyau afin d'en accélérer la dissolution.For this purpose, the invention proposes a core of the type described previously, characterized in that it comprises a cavity interior intended to allow, after use of the core for the making a casting, to a solvent to have access to capillarity in the heart of the nucleus in order to accelerate its dissolution.

Selon d'autres caractéristiques de l'invention :

  • la cavité intérieure est réalisée lors de l'opération de moulage dudit noyau,
  • la cavité est constituée d'une retassure interne obtenue par un refroidissement rapide de la surface extérieure du noyau.
According to other features of the invention:
  • the internal cavity is made during the molding operation of said core,
  • the cavity consists of an internal shrinkage obtained by rapid cooling of the outer surface of the core.

L'invention concerne aussi un procédé pour la réalisation d'un noyau du type décrit précédemment, du type qui comporte au moins une opération de moulage du noyau, caractérisé en ce que l'opération de moulage est suivie d'une opération de refroidissement rapide de la surface extérieure du noyau.The invention also relates to a method for producing a nucleus of the type previously described, of the type least one molding operation of the core, characterized in that the molding operation is followed by an operation of rapid cooling of the outer surface of the core.

Selon d'autres caractéristiques du procédé :

  • au cours de l'opération de refroidissement rapide de la surface extérieure du noyau, on refroidit rapidement la paroi d'une empreinte du moule au contact avec le noyau,
  • au cours de l'opération de moulage du noyau, on coule les sels minéraux en fusion par gravité dans le moule,
  • le procédé comporte de préférence une opération préliminaire de chauffage du moule préalable à l'opération de moulage, de manière à diminuer la différence initiale de température entre les sels minéraux et le moule,
According to other characteristics of the process:
  • during the rapid cooling operation of the outer surface of the core, the wall of an impression of the mold is rapidly cooled in contact with the core,
  • during the molding operation of the core, the molten mineral salts are cast by gravity into the mold,
  • the process preferably comprises a preliminary operation of heating the mold prior to the molding operation, so as to reduce the initial difference in temperature between the inorganic salts and the mold,

L'invention concerne encore un moule pour la réalisation d'un noyau comportant des moyens de refroidissement agencés à proximité de la paroi de l'empreinte du moule.The invention also relates to a mold for the production a core having cooling means arranged at near the wall of the mold cavity.

Selon une autre caractéristique du moule, celui-ci comporte des moyens internes de chauffage.According to another characteristic of the mold, this one has internal heating means.

D'autres caractéristiques et avantages de l'invention apparaítront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels :

  • la figure 1 est une vue schématique en coupe longitudinale avec arrachement d'un moule et d'un noyau selon l'invention au cours d'une opération de moulage en grappe du noyau conforme à l'invention ;
  • la figure 2 est une vue schématique en coupe longitudinale représentant la dissolution d'un noyau conventionnel dans une pièce de fonderie ;
  • la figure 3 est une vue schématique en coupe longitudinale représentant la dissolution d'un noyau selon l'invention dans une pièce de fonderie ;
Other features and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:
  • Figure 1 is a schematic longitudinal sectional view with tearing of a mold and a core according to the invention during a core molding operation of the core according to the invention;
  • Figure 2 is a schematic longitudinal sectional view showing the dissolution of a conventional core in a casting;
  • Figure 3 is a schematic longitudinal sectional view showing the dissolution of a core according to the invention in a casting;

Dans la description qui va suivre, des chiffres de référence identiques désignent des pièces identiques ou ayant des fonctions similaires.In the following description, reference numerals identical designates identical or functional parts Similar.

On a représenté à la figure 1 une opération de moulage en grappe de deux noyaux 10 destinés à la réalisation d'une pièce de fonderie du type de la pièce 12 qui a été représentée aux figures 2 et 3.FIG. 1 shows a molding operation in cluster of two cores 10 for the realization of a piece of foundry of the type of the piece 12 which has been shown in FIGS. 2 and 3.

Comme l'illustre la figure 1, au cours de l'opération de moulage du noyau 10, on réalise une coulée de sels minéraux en fusion dans un entonnoir d'alimentation 14 d'un moule 16. L'entonnoir d'alimentation communique à son extrémité inférieure avec une empreinte 18 du moule 16. As shown in Figure 1, during the operation of casting of the core 10, a casting of mineral salts is carried out in melting in a feed funnel 14 of a mold 16. The feed funnel communicates at its lower end with an impression 18 of the mold 16.

Au moins une partie des sels minéraux est choisie par exemple parmi les borates de potassium pour obtenir un noyau 10 présentant des caractéristiques mécaniques élevées.At least a part of the mineral salts is chosen by example among potassium borates to obtain a nucleus 10 having high mechanical characteristics.

Dans ces conditions, les sels minéraux se répartissent par gravité dans l'empreinte 18 du moule 16 suivant les flèches "F" pour constituer, après refroidissement, le noyau 12.Under these conditions, the mineral salts are distributed by gravity in the footprint 18 of the mold 16 according to the arrows "F" to form, after cooling, the core 12.

Le résultat obtenu est un noyau 12 analogue à celui qui a été représenté aux figures 2 et 3.The result obtained is a nucleus 12 similar to that which has shown in Figures 2 and 3.

Comme l'illustrent les figures 2 et 3, une pièce de fonderie 12 comportant une forme creuse 20 est obtenue par une opération de moulage avec le noyau 10 précédemment obtenu. La forme creuse 20 est complémentaire du noyau 10, et il, est nécessaire pour pouvoir exploiter cette forme creuse 20 de dissoudre le noyau 10 à l'aide d'un solvant, par exemple de l'eau dans le cas d'un noyau 10 selon l'invention comportant des sels à base de borate de potassium.As illustrated in Figures 2 and 3, a casting 12 having a hollow shape 20 is obtained by an operation molding with the core 10 previously obtained. The form hollow 20 is complementary to the core 10, and it is necessary to be able to exploit this hollow form 20 to dissolve the core 10 using a solvent, for example water in the case of a core 10 according to the invention comprising salts based on potassium borate.

Comme l'illustre la figure 2 qui représente une opération de dissolution d'un noyau 10 conventionnel, le solvant est introduit par une ouverture 22 d'extrémité du moule 12. Avec le noyau 10 conventionnel plein qui a été représenté à la figure 2, le solvant se propage dans le noyau 10 suivant des lignes de front 24 successives, en dissolvant progressivement le noyau 10 de la droite vers la gauche de la figure 2.As illustrated in Figure 2 which represents an operation of dissolution of a conventional core, the solvent is introduced by an end opening 22 of the mold 12. With the core 10 conventional solid which has been shown in Figure 2, the solvent spreads in kernel 10 following front lines 24 successive stages, gradually dissolving the core 10 of the right to the left of Figure 2.

De ce fait, l'opération de dissolution du noyau 10 est une opération longue qui, dans le cas d'une production de grande série, engendre des coûts d'immobilisation élevés dans l'atelier où est effectué la dissolution des noyaux 10.As a result, the dissolution operation of the core 10 is a long operation which, in the case of a large production series, generates high capital costs in the workshop where is made the dissolution of the nuclei 10.

Comme l'illustre la figure 3, pour remédier à cet inconvénient, l'invention propose un noyau 10 comportant une cavité intérieure 26 destinée, après usage du noyau 10 pour la réalisation d'une pièce 12 de fonderie, à permettre à un solvant d'avoir accès par capillarité au coeur du noyau 10 afin d'en accélérer la dissolution dans la pièce 12. As illustrated in Figure 3, to remedy this disadvantage, the invention proposes a core 10 having a interior cavity 26 intended, after use of the core 10 for the making a casting part 12, to allow a solvent to have access by capillarity to the core of the core 10 in order to accelerate the dissolution in the room 12.

Ainsi, lors de l'opération de dissolution du noyau 10, le solvant pénètre dans la cavité 26 comme représenté à la figure 3 et se propage de l'intérieur vers l'extérieur du noyau suivant des directions 28 variées représentées par les flèches de la figure 3.Thus, during the dissolution operation of the core 10, the solvent enters the cavity 26 as shown in FIG. and propagates from the inside to the outside of the nucleus according to various directions 28 represented by the arrows in FIG.

Conformément à l'invention, la cavité intérieure 26 est réalisée lors de l'opération de moulage du noyau 10.According to the invention, the inner cavity 26 is performed during the molding operation of the core 10.

La cavité 10 pourrait, de manière non limitative de l'invention, être réalisée par perçage ou en introduisant, préalablement au moulage du noyau, un élément de température de fusion plus élevée que les sels à base de borate de potassium, élément qui serait ôté du noyau 10 préalablement à l'opération de dissolution du noyau 10 pour former la cavité 26.The cavity 10 could, without limitation, the invention, to be carried out by drilling or by introducing, prior to molding the core, a temperature element higher melting point than potassium borate salts, element that would be removed from core 10 prior to the operation of dissolution of the core 10 to form the cavity 26.

Toutefois, dans le mode de réalisation préféré de l'invention, la cavité 26 est constituée d'une retassure interne du noyau obtenue grâce à un refroidissement rapide de la surface extérieure 28 du noyau 10 lors de son moulage.However, in the preferred embodiment of the invention, the cavity 26 consists of an internal shrinkage of the core obtained thanks to a rapid cooling of the surface outer 28 of the core 10 during its molding.

A cet effet, un procédé de fabrication du noyau 10 comporte au moins une opération de moulage telle que précédemment évoquée en référence à la figure 1, suivie d'une opération de refroidissement rapide de la surface extérieure 28 du noyau 10.For this purpose, a method of manufacturing the core 10 comprises at least one molding operation such that previously mentioned with reference to Figure 1, followed by a rapid cooling operation of the outer surface 28 of the core 10.

Au cours de cette opération de refroidissement rapide de la surface extérieure 28 du noyau 10, on refroidit rapidement la paroi de l'empreinte 18 du moule 16 qui est au contact avec le noyau 10.During this fast cooling operation of the outer surface 28 of the core 10, it quickly cooled the wall of the cavity 18 of the mold 16 which is in contact with the core 10.

A cet effet, comme l'illustre la figure 1, le moule 16 comporte des moyens 30 de refroidissement agencés à proximité de la paroi de l'empreinte 18 du moule 16,For this purpose, as illustrated in Figure 1, the mold 16 has cooling means arranged nearby of the wall of the cavity 18 of the mold 16,

Tous les moyens de refroidissement connus de l'état de la technique peuvent être utilisés pour la bonne réalisation de l'invention.All cooling means known from the state of the technique can be used for the proper the invention.

Sur l'arrachement de la figure 1, on a représenté, à titre d'exemple et de manière non limitative, des moyens 30 de refroidissement constitués d'un échangeur 32 logé dans le moule 16. Comme l'illustrent les flèches, l'échangeur est alimenté en fluide caloporteur par un conduit d'arrivée 34 et ce fluide est évacué par un conduit 36. Cette configuration permet d'évacuer un grand nombre de calories en une durée très réduite.On the tearing of Figure 1, there is shown, as example and in a nonlimiting manner, means 30 of cooling constituted by an exchanger 32 housed in the mold 16. As illustrated by the arrows, the exchanger is powered by heat transfer fluid through an inlet conduit 34 and this fluid is evacuated via a duct 36. This configuration makes it possible to evacuate a large number of calories in a very short time.

De tels échangeurs 34 sont répartis suivant toute la périphérie de l'empreinte 18, pour assurer une refroidissement rapide et uniforme de l'empreinte 18.Such exchangers 34 are distributed according to the entire periphery of the footprint 18, to ensure cooling fast and uniform impression 18.

Enfin, préalablement à l'opération de moulage du noyau 10, le procédé peut comporter une opération préliminaire de chauffage du moule 16 de manière à diminuer la différence initiale de température entre les sels minéraux et le moule 16.Finally, before the core molding operation 10, the method may comprise a preliminary operation of heating the mold 16 so as to reduce the initial difference temperature between the mineral salts and the mold 16.

A cet effet, le moule 16 comporte des moyens internes de chauffage 38, par exemple une ou plusieurs résistances électriques 40 logées dans le moule 16 et destinée(s) à permettre son élévation de température de manière uniforme.For this purpose, the mold 16 comprises internal means of heating 38, for example one or more resistors 40 housed in the mold 16 and intended (s) to allow its temperature rise in a uniform way.

L'invention permet donc de réaliser des noyaux en sels minéraux à base de borates de potassium qui ont la particularité d'être rapidement dissolvables, ce qui permet de réduire les coûts et les temps de production de pièces 12 moulées avec de tels noyaux.The invention thus makes it possible to produce salt cores Potassium borate-based minerals that have the particularity to be quickly dissolvable, which reduces costs and the production times of molded parts 12 with such nuclei.

Claims (9)

Noyau (10) pour la réalisation de formes creuses par fonderie, obtenu par moulage d'une coulée de sels minéraux en fusion dans un moule (16),
   caractérisé en ce qu'il comporte une cavité intérieure (26) destinée à permettre à un solvant d'avoir accès par capillarité au coeur du noyau afin d'en accélérer la dissolution dans la pièce (12) après usage du noyau.Core (10) for producing hollow shapes by casting, obtained by molding a molten mineral salt stream in a mold (16),
characterized in that it comprises an inner cavity (26) for allowing a solvent to have capillary access to the core of the core to accelerate its dissolution in the part (12) after use of the core. Noyau (10) selon la revendication précédente, caractérisé en ce que la cavité (26) intérieure est formée lors du moulage de celui-ci,Core (10) according to the preceding claim, characterized in that the cavity (26) inside is formed during molding thereof, Noyau (10) selon la revendication précédente, caractérisé en ce que la cavité (26) est constituée d'une retassure interne du noyau obtenue suite à un refroidissement rapide de sa surface extérieure (28).Core (10) according to the preceding claim, characterized in that the cavity (26) consists of an inner kerf shrinkage resulting from rapid cooling of its outer surface (28). Procédé de fabrication d'un noyau (10) selon la revendication 3, caractérisé en ce que l'opération de moulage est suivie d'une opération de refroidissement rapide de la surface extérieure (28) du noyau (10).A method of manufacturing a core (10) according to claim 3, characterized in that the molding operation is followed by a rapid cooling operation of the outer surface (28) of the core (10). Procédé de fabrication d'un noyau (10) selon la revendication précédente, caractérisé en ce que, au cours de l'opération de refroidissement rapide de la surface extérieure (28) du noyau (10), on refroidit rapidement la paroi d'une empreinte (18) du moule (10) au contact avec le noyau (10).A method of manufacturing a core (10) according to the preceding claim, characterized in that , during the rapid cooling operation of the outer surface (28) of the core (10), the wall of a core is rapidly cooled. impression (18) of the mold (10) in contact with the core (10). Procédé de fabrication d'un noyau (10) selon l'une des revendications précédentes 4 ou 5, caractérisé en ce que les sels minéraux en fusion sont coulés par gravité dans le moule (16) au cours de l'opération de moulage du noyau.A method of manufacturing a core (10) according to one of the preceding claims 4 or 5, characterized in that the molten mineral salts are gravity-cast in the mold (16) during the molding operation of the core . Procédé de fabrication d'un noyau (10) selon l'une quelconque des revendications 4 à 6, caractérisé en ce qu'il comporte une opération préliminaire de chauffage du moule (16) préalable à l'opération de moulage, en vue de diminuer la différence initiale de température entre les sels minéraux et le moule (16). A method of manufacturing a core (10) according to any one of claims 4 to 6, characterized in that it comprises a preliminary operation of heating the mold (16) prior to the molding operation, in order to reduce the initial difference in temperature between the mineral salts and the mold (16). Moule (16) pour la réalisation d'un noyau (10) selon les revendications 1 à 3 suivant un procédé selon la revendication 5, caractérisé en ce qu'il comporte des moyens (30) de refroidissement agencés à proximité de la paroi de l'empreinte (18) du moule (16).Mold (16) for producing a core (10) according to Claims 1 to 3 according to a process according to Claim 5, characterized in that it comprises cooling means (30) arranged in the vicinity of the wall of the wall. imprint (18) of the mold (16). Moule (16) pour la réalisation d'un noyau (10) selon les revendications 1 à 3 suivant un procédé selon la revendication 7, caractérisé en ce que le moule (16) comporte des moyens internes (38) de chauffage.Mold (16) for producing a core (10) according to claims 1 to 3 according to a method according to claim 7, characterized in that the mold (16) has internal heating means (38).
EP20040300450 2003-07-31 2004-07-19 Potassium borate foundry core with dissolution cavity Expired - Fee Related EP1502676B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0309428A FR2858256B1 (en) 2003-07-31 2003-07-31 POTASSIUM BORATE FOUNDRY CORE HAVING A DISSOLUTION CAVITY
FR0309428 2003-07-31

Publications (2)

Publication Number Publication Date
EP1502676A1 true EP1502676A1 (en) 2005-02-02
EP1502676B1 EP1502676B1 (en) 2009-12-16

Family

ID=33523030

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20040300450 Expired - Fee Related EP1502676B1 (en) 2003-07-31 2004-07-19 Potassium borate foundry core with dissolution cavity

Country Status (4)

Country Link
EP (1) EP1502676B1 (en)
DE (1) DE602004024620D1 (en)
ES (1) ES2336104T3 (en)
FR (1) FR2858256B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004046962A1 (en) * 2004-09-28 2006-04-06 Volkswagen Ag Casting method used in the production of engine parts of vehicles comprises delaying introduction of heat in partial regions in the solidification stage of the melt
DE102005023901A1 (en) * 2005-05-24 2006-11-30 Volkswagen Ag Mold, for gravity and low pressure casting, has an opening to take an electrical heating cartridge to set the mold temperature before and/or during the pouring of hot metal
DE102008037778A1 (en) * 2008-08-14 2010-02-18 Volkswagen Ag Casting device comprises casting units having a mold with a feeder, a rotatable turntable on which the casting units are arranged, means for introducing molten metal in the mold, and a robot apparatus arranged on a rotating device
DE102015118901A1 (en) * 2015-11-04 2017-05-04 Uwe Richter Method of conformal planar temperature control of segmented cup-shaped molds

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01306043A (en) * 1988-05-31 1989-12-11 Tsuchiya Mfg Co Ltd Manufacture of heat fusible core
EP0613742A1 (en) * 1993-03-05 1994-09-07 Puget Corporation Die casting using casting salt cores
WO1998024573A1 (en) * 1996-12-05 1998-06-11 Dynacast Limited Die casting and like moulds
FR2819205A1 (en) * 2001-01-05 2002-07-12 Renault Foundry core for production of hollow cast articles comprises mineral salts including potassium borates

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01306043A (en) * 1988-05-31 1989-12-11 Tsuchiya Mfg Co Ltd Manufacture of heat fusible core
EP0613742A1 (en) * 1993-03-05 1994-09-07 Puget Corporation Die casting using casting salt cores
WO1998024573A1 (en) * 1996-12-05 1998-06-11 Dynacast Limited Die casting and like moulds
FR2819205A1 (en) * 2001-01-05 2002-07-12 Renault Foundry core for production of hollow cast articles comprises mineral salts including potassium borates

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 097 (M - 0940) 22 February 1990 (1990-02-22) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004046962A1 (en) * 2004-09-28 2006-04-06 Volkswagen Ag Casting method used in the production of engine parts of vehicles comprises delaying introduction of heat in partial regions in the solidification stage of the melt
DE102005023901A1 (en) * 2005-05-24 2006-11-30 Volkswagen Ag Mold, for gravity and low pressure casting, has an opening to take an electrical heating cartridge to set the mold temperature before and/or during the pouring of hot metal
DE102008037778A1 (en) * 2008-08-14 2010-02-18 Volkswagen Ag Casting device comprises casting units having a mold with a feeder, a rotatable turntable on which the casting units are arranged, means for introducing molten metal in the mold, and a robot apparatus arranged on a rotating device
DE102015118901A1 (en) * 2015-11-04 2017-05-04 Uwe Richter Method of conformal planar temperature control of segmented cup-shaped molds

Also Published As

Publication number Publication date
FR2858256A1 (en) 2005-02-04
EP1502676B1 (en) 2009-12-16
DE602004024620D1 (en) 2010-01-28
FR2858256B1 (en) 2006-02-10
ES2336104T3 (en) 2010-04-08

Similar Documents

Publication Publication Date Title
FR2524830A1 (en) PROCESS FOR POSITIONING CORES IN MOLDS
CA2837151A1 (en) Method for manufacturing a metal foam provided with channels and resulting metal foam
FR2504828A1 (en) PROCESS FOR THE MANUFACTURE, BY MOLDING, OF A HOLLOW BODY OF COMPLEX SHAPES
EP2895285B1 (en) Foundry model
FR2507513A1 (en) GRAIN SELECTOR DEVICE FOR MOLDING SINGLE CRYSTAL OBJECTS
EP1502676A1 (en) Potassium borate foundry core with dissolution cavity
EP3134219B1 (en) Mould for monocrystalline casting
FR2462261A1 (en) Two component injection moulding with semi interlocking melt interface - produced by ram pressure adjacent to the fresh interface
EP4021663B1 (en) Improved method for manufacturing a ceramic core for manufacturing turbomachine vanes and ceramic core
FR3018710B1 (en) CASTING TREE AND METHOD OF ASSEMBLY
FR3070286A1 (en) CASTING TREE FOR LOST MODEL FOUNDING MANUFACTURING PROCESS AND METHOD OF MANUFACTURE
JP6351319B2 (en) Mold cooling structure and manufacturing method thereof
JP3339503B2 (en) Mold for cast-in pipe
FR2679161A1 (en) Casting method and mould for improving the fineness of grain of moulded metallic components
WO2005097376A2 (en) Mould for casting a liquid metal and associated method
EP3657115B1 (en) Method for manufacturing a heat exchanger module with at least one fluid circulation circuit
EP3657113B1 (en) Method for manufacturing a heat exchanger module with at least one fluid circulation circuit
JP2006216885A (en) Apparatus and method for manufacturing tubing in solenoid
JP2004114334A (en) Mold assembly and molding method
JP2004261842A (en) Method for casting aluminum alloy in metallic mold, and metallic mold
FR2477462A1 (en) PROCESS FOR THE INJECTION MOLDING OF PLASTIC MATERIALS HAVING HOLLOW OR LEFT FORMS UNDEROUT, AND TOOLS USED
TWM645815U (en) Mold for casting steel ingot
FR2505217A1 (en) Composite vertical metal and sand mould for casting rolls - where surface of metal mould is fed with cooling air, esp. to improve surface hardness of chilled cast iron roll barrel
JP5581608B2 (en) Injection molding method
FR2966066A1 (en) Lost model casting models made of sublimable material in container/tank, by embedding models in sand by leaving pouring opening and pouring liquid metal into opening, and positioning cooling element in support against surfaces of model

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL HR LT LV MK

17P Request for examination filed

Effective date: 20050713

AKX Designation fees paid

Designated state(s): BE DE ES GB IT

17Q First examination report despatched

Effective date: 20071008

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE ES GB IT

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REF Corresponds to:

Ref document number: 602004024620

Country of ref document: DE

Date of ref document: 20100128

Kind code of ref document: P

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2336104

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20100917

BERE Be: lapsed

Owner name: RENAULT S.A.S.

Effective date: 20100731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100731

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20150721

Year of fee payment: 12

Ref country code: DE

Payment date: 20150721

Year of fee payment: 12

Ref country code: ES

Payment date: 20150728

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20150727

Year of fee payment: 12

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602004024620

Country of ref document: DE

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20160719

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160719

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160719

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20160720

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20181129