EP1502676A1 - Noyau de fonderie à base de borates de potassium comportant une cavité de dissolution. - Google Patents
Noyau de fonderie à base de borates de potassium comportant une cavité de dissolution. Download PDFInfo
- 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
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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
Description
- 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.
- 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,
- 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 ;
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. - Noyau (10) selon la revendication précédente, caractérisé en ce que la cavité (26) intérieure est formée lors du moulage de celui-ci,
- 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).
- 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).
- 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).
- 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.
- 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).
- 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).
- 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.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0309428 | 2003-07-31 | ||
FR0309428A FR2858256B1 (fr) | 2003-07-31 | 2003-07-31 | Noyau de fonderie a base de borates de potassium comportant une cavite de dissolution |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1502676A1 true EP1502676A1 (fr) | 2005-02-02 |
EP1502676B1 EP1502676B1 (fr) | 2009-12-16 |
Family
ID=33523030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20040300450 Expired - Lifetime EP1502676B1 (fr) | 2003-07-31 | 2004-07-19 | Noyau de fonderie à base de borates de potassium comportant une cavité de dissolution. |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1502676B1 (fr) |
DE (1) | DE602004024620D1 (fr) |
ES (1) | ES2336104T3 (fr) |
FR (1) | FR2858256B1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004046962A1 (de) * | 2004-09-28 | 2006-04-06 | Volkswagen Ag | Gießverfahren |
DE102005023901A1 (de) * | 2005-05-24 | 2006-11-30 | Volkswagen Ag | Einsatz von Heizpatronen im Schwerkraft und Niederdruckkokillenguss |
DE102008037778A1 (de) * | 2008-08-14 | 2010-02-18 | Volkswagen Ag | Gießvorrichtung und Kokille für eine Gießvorrichtung |
DE102015118901A1 (de) * | 2015-11-04 | 2017-05-04 | Uwe Richter | Verfahren der konturnahen flächenhaften Temperierung von segmentierten schalenförmigen Formwerkzeugen |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01306043A (ja) * | 1988-05-31 | 1989-12-11 | Tsuchiya Mfg Co Ltd | 熱可融性中子の製造方法 |
EP0613742A1 (fr) * | 1993-03-05 | 1994-09-07 | Puget Corporation | Noyaux de sel coulés pour coulée sous pression |
WO1998024573A1 (fr) * | 1996-12-05 | 1998-06-11 | Dynacast Limited | Moule tel qu'un moule de coulee sous pression |
FR2819205A1 (fr) * | 2001-01-05 | 2002-07-12 | Renault | Noyau de fonderie a base de borates de potassium et procede de fabrication d'un tel noyau |
-
2003
- 2003-07-31 FR FR0309428A patent/FR2858256B1/fr not_active Expired - Fee Related
-
2004
- 2004-07-19 DE DE200460024620 patent/DE602004024620D1/de not_active Expired - Lifetime
- 2004-07-19 EP EP20040300450 patent/EP1502676B1/fr not_active Expired - Lifetime
- 2004-07-19 ES ES04300450T patent/ES2336104T3/es not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01306043A (ja) * | 1988-05-31 | 1989-12-11 | Tsuchiya Mfg Co Ltd | 熱可融性中子の製造方法 |
EP0613742A1 (fr) * | 1993-03-05 | 1994-09-07 | Puget Corporation | Noyaux de sel coulés pour coulée sous pression |
WO1998024573A1 (fr) * | 1996-12-05 | 1998-06-11 | Dynacast Limited | Moule tel qu'un moule de coulee sous pression |
FR2819205A1 (fr) * | 2001-01-05 | 2002-07-12 | Renault | Noyau de fonderie a base de borates de potassium et procede de fabrication d'un tel noyau |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 014, no. 097 (M - 0940) 22 February 1990 (1990-02-22) * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004046962A1 (de) * | 2004-09-28 | 2006-04-06 | Volkswagen Ag | Gießverfahren |
DE102005023901A1 (de) * | 2005-05-24 | 2006-11-30 | Volkswagen Ag | Einsatz von Heizpatronen im Schwerkraft und Niederdruckkokillenguss |
DE102008037778A1 (de) * | 2008-08-14 | 2010-02-18 | Volkswagen Ag | Gießvorrichtung und Kokille für eine Gießvorrichtung |
DE102015118901A1 (de) * | 2015-11-04 | 2017-05-04 | Uwe Richter | Verfahren der konturnahen flächenhaften Temperierung von segmentierten schalenförmigen Formwerkzeugen |
Also Published As
Publication number | Publication date |
---|---|
FR2858256A1 (fr) | 2005-02-04 |
EP1502676B1 (fr) | 2009-12-16 |
ES2336104T3 (es) | 2010-04-08 |
DE602004024620D1 (de) | 2010-01-28 |
FR2858256B1 (fr) | 2006-02-10 |
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