FR2707901A1 - Method for disintegrating a moulding-sand core - Google Patents
Method for disintegrating a moulding-sand core Download PDFInfo
- Publication number
- FR2707901A1 FR2707901A1 FR9309090A FR9309090A FR2707901A1 FR 2707901 A1 FR2707901 A1 FR 2707901A1 FR 9309090 A FR9309090 A FR 9309090A FR 9309090 A FR9309090 A FR 9309090A FR 2707901 A1 FR2707901 A1 FR 2707901A1
- Authority
- FR
- France
- Prior art keywords
- core
- wire
- sand
- disintegrating
- casting
- 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
Links
Classifications
-
- 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
-
- 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
- B22C9/106—Vented or reinforced cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Description
L'invention a pour ob:ift un procédé pour la déagrégftion des noyaux de sable de fonderie utilisés pour réaliser par moulage des pièces présentant des parties creuses.The object of the invention is: ift a process for the disaggregation of foundry sand cores used to produce by molding parts having hollow parts.
On sait que, pour réaliser de telles pièces, on utilise des noyaux de sable qui occupent la place des parties creuses , ces noyaux étant éliminés après la coulée. Pour effectuer ce dessablage, plusieurs méthodes sont actuellement utilisées.It is known that, to produce such parts, sand cores are used which take the place of the hollow parts, these cores being removed after casting. To do this, several methods are currently used.
On peut par exemple désagréger le sable à l'aide de machines fonctionnant suivant le principe des marteaux piqueurs et éliminer le sable par soufflage: cependant, ces machines ont un coût de maintenance important car elles résistent mal à une atmosphère chargée de sable et, en général, elles manquent d'efficacité,
On a également proposé des procédés consistant à soumettre la pièce à des vibrations et/ou à des chocs. Si l'on obtient une meilleure efficacité de dessablage, ces procédés ne peuvent être utilisés pour des pièces à géométrie complexe comme les collecteurs d'échappement, ni sur des pièces en aluminium tendre, qui ne supportent pas les chocs.We can for example disintegrate the sand using machines operating according to the principle of jackhammers and remove the sand by blowing: however, these machines have a significant maintenance cost because they resist badly to an atmosphere charged with sand and, in general, they are ineffective,
Methods have also been proposed of subjecting the part to vibrations and / or shocks. If a better sanding efficiency is obtained, these methods cannot be used for parts with complex geometry such as exhaust manifolds, nor on soft aluminum parts, which do not withstand impacts.
L'invention a pour but d éliminer les inconvénients ci-dessus en proposant un procédé de désagrégation d un noyau de sable de fonderie qui soit simple et facile à mettre en oeuvre et ne risque pas d'abîmer les pièces.The object of the invention is to eliminate the above drawbacks by proposing a method for disintegrating a foundry sand core which is simple and easy to implement and does not risk damaging the parts.
Selon la principale caractéristique de ce procédé, celui-ci comprend les étapes suivantes consistant à:
a) - introduire dans le noyau, avant la coulée, un objet
filiforme non rectiligne apte à se déformer sous un effort
de traction; et
b) - exercer sur ledit objet un effort de traction après la
coulée afin que, par sa déformation, il provoque la
désagrégation du sable.According to the main characteristic of this process, it comprises the following steps consisting in:
a) - introduce into the core, before casting, an object
filiform non-rectilinear able to deform under stress
traction; and
b) - exert on said object a tensile force after the
casting so that, by its deformation, it causes the
disintegration of the sand.
L' expression se déforme " utilisée ici signifie que l obiet change de géométrie, par exemple en se rapprochant d'une forme rectiligne. The expression deformed "used here means that the object changes geometry, for example by approaching a rectilinear shape.
Ledit objet peut être un fil métallique ou analogue et se présenter par exemple sous la forme d'une ligne brisée ou d'un ressort hélicoïdal.Said object can be a metal wire or the like and can be presented, for example, in the form of a broken line or a helical spring.
Avantageusement, ledit objet est mis en place pendant la fabrication du noyau.Advantageously, said object is put in place during the manufacture of the core.
L'invention apparaîtra mieux à la lecture de la description qui va suivre, donnée uniquement à titre exemple, en référence aux dessins annexés dans lesquels:
- la Figure 1 est une vue schématique en coupe illustrant
un premier mode de mise en oeuvre du procédé objet de
I'invention; et
- la Figure 2 est une vue schématique en coupe et en
perspective illustrant un deuxième mode de mise en oeuvre
de ce procédé, les éléments communs aux deux figures
portant les mêmes numéros de référence.The invention will appear better on reading the description which follows, given solely by way of example, with reference to the appended drawings in which:
- Figure 1 is a schematic sectional view illustrating
a first mode of implementation of the method which is the subject of
The invention; and
- Figure 2 is a schematic sectional view and
perspective illustrating a second mode of implementation
of this process, the elements common to the two figures
with the same reference numbers.
La figure t montre schématiquement une pièce métallique 1 par exemple en aluminium, réalisée en fonderie et présentant un alésage 2 qui la traverse de part en part Pour réaliser une telle pièce, on met en place dans le moule avant la coulée un noyau de sable 3 qui occupe I'emplacement de cet alésage. Selon I'invention, ce noyau 3 contient un fil métallique 4 qui, dans exemple de la figure X, se présente sous la forme d'une ligne brisée et dépasse du noyau à chacune de ses extrémités. Figure t schematically shows a metal part 1 for example made of aluminum, produced in a foundry and having a bore 2 which passes right through it. To produce such a part, a core of sand 3 is placed in the mold before casting. which occupies the location of this bore. According to the invention, this core 3 contains a metal wire 4 which, in the example of FIG. X, is in the form of a broken line and protrudes from the core at each of its ends.
Le fil 4 peut être en tout matériau approprié pourvu qu il résiste aux températures atteintes pendant la coulée.The wire 4 may be of any suitable material provided that it withstands the temperatures reached during casting.
Une fois la pièce 1 solidifiée. on procède au dessablage en tirant sur les deux extrémités du fil 4 comme cela est symbolisé par les flèches F sur la figure 1. Ceci a pour effet de déformer le fil qui tend à se rapprocher d'une forme rectiligne. Les différents segments qui composent la ligne brisée se déplacent à l'intérieur de la masse sableuse et exercent sur cette dernière un effort qui en provoque la désagrégation. Lorsque celle-ci est suffisante, il est facile d'éliminer le sable, par exemple par soufflage.Once part 1 has solidified. sanding is carried out by pulling on the two ends of the wire 4 as is symbolized by the arrows F in FIG. 1. This has the effect of deforming the wire which tends to approach a rectilinear shape. The different segments that make up the broken line move inside the sandy mass and exert an effort on the latter which causes it to disintegrate. When this is sufficient, it is easy to remove the sand, for example by blowing.
Dans le cas de la figure 2, la pièce I présente un trou borgne 5 qui débouche à sa partie supérieure, le noyau 3 occupant l'emplacement de ce trou borgne.In the case of Figure 2, the part I has a blind hole 5 which opens at its upper part, the core 3 occupying the location of this blind hole.
Dans cette variante, le fil 4 a la forme d'un ressort hélicoïdal présentant un certain nombre de spires 6 noyées dans la masse de sable et dont une extrémité 4a dépasse à l'extérieur.In this variant, the wire 4 has the shape of a helical spring having a number of turns 6 embedded in the mass of sand and one end 4a of which protrudes outside.
Après la coulée, on exerce une traction sur l-extrémité 4a du fil (flèche G sur la figure 2). Les spires 6 se déforment, les plus proches de I'extrémité 4a se déformant plus que les autres comme cela est symbolisé par les flèches H. Comme ci-dessuss cette déformation a pour effet de désagréger la masse de sable et donc d-en faciliter l'extraction.After casting, traction is exerted on the end 4a of the wire (arrow G in FIG. 2). The turns 6 are deformed, the closest to the end 4a deforming more than the others as symbolized by the arrows H. As above this deformation has the effect of disaggregating the mass of sand and therefore of facilitating it extraction.
Il est à noter que, dans I'un et lZautre cas, le fil est de préférence intégré à lintérieur du noyau pendant la fabrication de ce dernier.It should be noted that, in one and the other case, the wire is preferably integrated inside the core during the manufacture of the latter.
Ainsi, le procédé objet de l'invention présente des avantages particulièrement intéressants puisqu'il permet un débourrage efficace sans risque d'endommager la pièce: en effet. celle-ci n'est pas soumise à des chocs et les contacts qu'il peut y avoir avec le fil sont sans conséquence. De plus, le fait d'incorporer un fil métallique au noyau augmente la rigidité de ce dernier et le procédé peut s'adapter à tout type de pièce, même à celles qui présentent une géométrie complexe comme les culasses et les collecteurs d'échappement, Enfin, le procédé est utilisable avec tout type de sable ou de résine et il permet la manutention du noyau par l'extrémité du fil pour une éventuelle pose automatique.Thus, the process which is the subject of the invention has particularly advantageous advantages since it allows effective cleaning without the risk of damaging the part: indeed. it is not subjected to shocks and the contacts that there may be with the wire are of no consequence. In addition, the fact of incorporating a metal wire into the core increases the rigidity of the latter and the process can be adapted to any type of part, even those which have a complex geometry such as cylinder heads and exhaust manifolds, Finally, the process can be used with any type of sand or resin and allows handling of the core by the end of the wire for possible automatic laying.
Il est bien entendu que l'invention ne se limite pas aux seuls modes de réalisation décrits et représentés, mais qu'on peut imaginer de nombreuses variantes sans sortir du cadre de linvention, notamment en ce qui concerne le matériau constitutif du fil et la géométrie qu'il convient de lui donner. It is understood that the invention is not limited to the embodiments described and shown, but that one can imagine many variants without departing from the scope of the invention, in particular as regards the material of the wire and the geometry that should be given to him.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9309090A FR2707901B1 (en) | 1993-07-23 | 1993-07-23 | Process for the disintegration of a foundry sand core. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9309090A FR2707901B1 (en) | 1993-07-23 | 1993-07-23 | Process for the disintegration of a foundry sand core. |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2707901A1 true FR2707901A1 (en) | 1995-01-27 |
FR2707901B1 FR2707901B1 (en) | 1995-09-01 |
Family
ID=9449560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR9309090A Expired - Fee Related FR2707901B1 (en) | 1993-07-23 | 1993-07-23 | Process for the disintegration of a foundry sand core. |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2707901B1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6425436B1 (en) * | 2000-06-16 | 2002-07-30 | Amsted Industries Incorporated | Sand core breaking apparatus |
EP1500446A2 (en) * | 2003-07-21 | 2005-01-26 | DaimlerChrysler AG | Reinforced foundry cores for metal casting, method and use |
EP1804984A2 (en) * | 2004-08-25 | 2007-07-11 | Martin Zoldan | Pre-tensioned sand core |
WO2009140775A1 (en) * | 2008-05-22 | 2009-11-26 | Bühler Druckguss AG | Method for producing cores |
WO2009149567A1 (en) * | 2008-06-12 | 2009-12-17 | Bühler Druckguss AG | Lost core having a reinforcing element for the removal thereof |
CN101987347A (en) * | 2010-09-29 | 2011-03-23 | 西安交通大学 | Manufacturing method of core for casting engine exhaust manifold |
DE102014221359A1 (en) * | 2014-10-21 | 2016-04-21 | Volkswagen Aktiengesellschaft | A method of manufacturing a die-cast metallic component using a salt core having an integral support structure and die cast component made therewith |
CN107584080A (en) * | 2017-09-22 | 2018-01-16 | 芜湖火龙动力科技有限公司 | A kind of sand core rod pre-tightening device |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2907084A (en) * | 1956-03-27 | 1959-10-06 | Aluminum Co Of America | Hollow cores for making castings |
JPS5597844A (en) * | 1979-01-17 | 1980-07-25 | Honda Motor Co Ltd | Forming method of cast-out hole |
US4352387A (en) * | 1979-05-24 | 1982-10-05 | Sankyo Oilless Industry, Inc. | Process for producing a hollow cast product |
DE3144958A1 (en) * | 1981-11-12 | 1983-05-19 | Honsel-Werke Ag, 5778 Meschede | Core for the production of narrow channels in castings |
JPS63256262A (en) * | 1987-04-13 | 1988-10-24 | Toyota Motor Corp | Method for removing core sand of casting |
DE3739637A1 (en) * | 1987-11-23 | 1989-06-01 | Dietrich Reinhard | Foundry core and method for recovering the core material when using such a foundry core |
-
1993
- 1993-07-23 FR FR9309090A patent/FR2707901B1/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2907084A (en) * | 1956-03-27 | 1959-10-06 | Aluminum Co Of America | Hollow cores for making castings |
JPS5597844A (en) * | 1979-01-17 | 1980-07-25 | Honda Motor Co Ltd | Forming method of cast-out hole |
US4352387A (en) * | 1979-05-24 | 1982-10-05 | Sankyo Oilless Industry, Inc. | Process for producing a hollow cast product |
DE3144958A1 (en) * | 1981-11-12 | 1983-05-19 | Honsel-Werke Ag, 5778 Meschede | Core for the production of narrow channels in castings |
JPS63256262A (en) * | 1987-04-13 | 1988-10-24 | Toyota Motor Corp | Method for removing core sand of casting |
DE3739637A1 (en) * | 1987-11-23 | 1989-06-01 | Dietrich Reinhard | Foundry core and method for recovering the core material when using such a foundry core |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 13, no. 48 (M - 793)<3396> 3 February 1989 (1989-02-03) * |
PATENT ABSTRACTS OF JAPAN vol. 4, no. 143 (M - 35)<625> 8 October 1980 (1980-10-08) * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6425436B1 (en) * | 2000-06-16 | 2002-07-30 | Amsted Industries Incorporated | Sand core breaking apparatus |
EP1500446A2 (en) * | 2003-07-21 | 2005-01-26 | DaimlerChrysler AG | Reinforced foundry cores for metal casting, method and use |
EP1500446A3 (en) * | 2003-07-21 | 2005-09-28 | DaimlerChrysler AG | Reinforced foundry cores for metal casting, method and use |
EP1804984A2 (en) * | 2004-08-25 | 2007-07-11 | Martin Zoldan | Pre-tensioned sand core |
EP1804984A4 (en) * | 2004-08-25 | 2008-10-15 | Martin Zoldan | Pre-tensioned sand core |
US8397789B2 (en) | 2004-08-25 | 2013-03-19 | Martin Zoldan | Pre-tensioned sand core |
WO2009140775A1 (en) * | 2008-05-22 | 2009-11-26 | Bühler Druckguss AG | Method for producing cores |
WO2009149567A1 (en) * | 2008-06-12 | 2009-12-17 | Bühler Druckguss AG | Lost core having a reinforcing element for the removal thereof |
CN101987347A (en) * | 2010-09-29 | 2011-03-23 | 西安交通大学 | Manufacturing method of core for casting engine exhaust manifold |
CN101987347B (en) * | 2010-09-29 | 2012-07-25 | 西安交通大学 | Manufacturing method of core for casting engine exhaust manifold |
DE102014221359A1 (en) * | 2014-10-21 | 2016-04-21 | Volkswagen Aktiengesellschaft | A method of manufacturing a die-cast metallic component using a salt core having an integral support structure and die cast component made therewith |
CN107584080A (en) * | 2017-09-22 | 2018-01-16 | 芜湖火龙动力科技有限公司 | A kind of sand core rod pre-tightening device |
Also Published As
Publication number | Publication date |
---|---|
FR2707901B1 (en) | 1995-09-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |
Effective date: 20080331 |