EP0324840B1 - Method and device for fabricating moulds from granular material - Google Patents
Method and device for fabricating moulds from granular material Download PDFInfo
- Publication number
- EP0324840B1 EP0324840B1 EP88907004A EP88907004A EP0324840B1 EP 0324840 B1 EP0324840 B1 EP 0324840B1 EP 88907004 A EP88907004 A EP 88907004A EP 88907004 A EP88907004 A EP 88907004A EP 0324840 B1 EP0324840 B1 EP 0324840B1
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- European Patent Office
- Prior art keywords
- plates
- armature
- envelope
- moulds
- pattern plates
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- 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.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C11/00—Moulding machines characterised by the relative arrangement of the parts of same
- B22C11/10—Moulding machines characterised by the relative arrangement of the parts of same with one or more flasks forming part of the machine, from which only the sand moulds made by compacting are removed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C21/00—Flasks; Accessories therefor
- B22C21/02—Sectional flasks, i.e. with divided, articulated, or interchangeable side sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
Definitions
- the subject of the present invention is a device for the manufacture of foundry molds made of granular material according to the preamble of claim 1 and the implementation process according to the preamble of claim 6 .
- a gas-impermeable sheet such as a plastic film
- a so-called model form itself placed on a support allowing, by suction, the thermoforming of the plastic film;
- a "frame" frame is placed over it, equipped with air suction devices and filters intended to retain the sand, the volume thus determined is filled with granular material which can be compacted by vibration;
- a new sheet of plastic film is placed over it, then, through the chassis, the air trapped between the two plastic films and the chassis is sucked in, which has the effect of giving cohesion to the grains.
- the chassis is composed of two identical upper and lower parts, each comprising air evacuation tubes connected to a communication passage, itself connected to a vacuum pump.
- the tubes are distributed regularly, so as to cover a large surface.
- French patent application No. 2,307,596 relates to a frame of foundry molds in which there is provided a means for introducing and recovering the granular material used.
- the means consists of a volume of substantially frustoconical shape, the small base being provided with a hatch through which the filling tube can be introduced. This hatch is airtight and remains closed throughout the use of the chassis. After molding, the vacuum is broken, the chassis being turned over, the hatch opens and lets the material flow by gravity.
- the casting is carried out with the mold produced by assembling the two frames, which immobilizes two expensive frames for obtaining a single mold.
- Two separate plastic films are brought vertically onto two model plates, which are themselves held vertically.
- the present invention aims to remedy these drawbacks.
- the invention as characterized in the claims, solves the problem of creating a device for manufacturing clodding molds, from a granular material, using (vacuum cohesion effect in a polymer envelope conforming to the shape of two model plates placed face to face, with which it is possible to obtain, on a single clod, the two faces necessary for making casting impressions by juxtaposition of identical clods, to allow continuous casting with very reduced handling.
- the process is semi-continuous, but the casting can be continuous by juxtaposing the lumps.
- the number of parts required is reduced, as is the volume of granular material used.
- Figures 1 to 7 constitute the block diagram of manufacturing according to the method and with a device according to the invention.
- These plates are also each provided with a connector 101 , 120 , 111 , 130 , allowing the connection with a vacuum source and / or compressed air, in known manner.
- the plates are made from bored plates, or made of porous material, so as to allow the suction during thermoforming and the subsequent blowing for demolding.
- a polymeric envelope 17 of planar initial shape, is placed on the surface, which is adapted by thermoforming under suction to the profile of the model plates.
- the plates 10-13 are mounted so that the two model plates are face to face, the shape being oriented inward.
- the sealing plate 12 serves as a lower support and receives the frame 20 .
- the sealing plate 13 remains open to the outside.
- the frame 20 consists of two opposite plates 21,22 connected by two tubes 23,24 , the plates being provided with grooves 28,29 .
- the tubes are thick enough to give the frame great rigidity.
- the tubes 23 and 24 open out inside a volume 25 inside the plate 21 , forming a common chamber, and outside this plate, an external connector 26 is provided.
- This connector can be connected by any flexible pipe to a vacuum source.
- Handling lugs such as 260 are also provided for transporting the frame.
- These tubes 23 and 24 are provided with perforations 27 of a diameter such that they allow the passage of air but not that of the grains of the granular material which will be dealt with later.
- the opposite plates 21 and 22 are connected by a single conduit 230 of rectangular section, the sides of which have a screened surface 270 .
- Figure 4 shows diagrammatically the filling device consisting of plates, the envelope and the reinforcement by siliceous sand 30, of the type used in molding, or any other suitable granular material.
- This filling is carried out, for example, using an extension 31 , while the device and sand assembly is subjected to compaction by means of a vibrating table (not shown), symbolized by the arrows 32 .
- a vibrating table not shown
- the amplitude and frequency will be adapted according to the granular material, the characteristics and the shapes of the model plates.
- a vacuum was maintained on the surface of the plates by means of a vacuum source and fittings 101 , 120 , 111 , 130 , which aims to keep the polymer envelope perfectly pressed on the shapes to be reproduce.
- the assembly is subjected to any compaction by the lower closure plate and a vacuum is applied inside the closed volume 41 by the tubes 23 and 24 connected to a vacuum source by the connector 26 .
- Figure 6 shows the removal of the model plates and sealing plates. This withdrawal is carried out by removing the depression and, if necessary, by introducing, this time, a slight overpressure to facilitate detachment. This removal is carried out by rotation, as shown in FIG. 6, or by translation, as shown in FIG. 8.
- the frame 20 and sand 30 assembly in the polymer envelope forms the clod which can be transported.
- the clods push each other on the pouring area, after installation of any cores.
- Casting is carried out conventionally by conduits reserved for this use, with or without a counterweight.
- the batch is transferred to the release station which will, by removing the vacuum, recover the cast product on the one hand, the reinforcement and the sand on the other.
- a continuous process can be provided with transfer and clod supply one by one.
- additional tightening can be provided by at least the lower sealing plate 12 and, optionally, the upper sealing plate 13 .
- a mechanical or pneumatic device for example, intended to deform, is placed on the lower 12 and upper 13 sealing plates. the polymeric envelope 17 and pushing back the sand 30 . This operation is especially useful in complex forms.
- the polymeric envelope can be covered with a layer of a particular product, intended to facilitate release, for example.
- the direction of the vibrations can be varied to obtain a better quality of compaction.
- a variant of the invention proposes to produce a peripheral groove on the end plates of the frame, which is put in relation with the common depression room.
- the support it comprises, on the corresponding edges, an inflatable seal.
- the process consists, before the introduction of the sand, in pressing the edge of the polymeric envelope in the groove by the inflatable seal, in carrying out the operations of filling, compacting, leveling, welding, then in depressurizing the sand and the common room, which plates the edge of the envelope in the groove, the support and the plates can be easily removed.
- the invention proposes a variant for producing the tubes.
- These can be hollow, of square or rectangular section.
- a microporous or bored plate is added at a certain distance from the surface of the tube, in particular by means of threaded lugs. Two corridors parallel to the central tube are thus defined.
- the method makes it possible to use a three-sided reinforcement, with two model plates articulated around a closure plate, two polymer sheets, which are welded in the upper part after filling and compacting, before vacuum the contents.
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- Casting Devices For Molds (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
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- Formation And Processing Of Food Products (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
Description
La présente invention a pour objet un dispositif pour la fabrication de moules de fonderies en matériau granulaire suivant le préambule de la revendication 1 et le procédé de mise en oeuvre suivant le préambule de la revendication 6.The subject of the present invention is a device for the manufacture of foundry molds made of granular material according to the preamble of
La fabrication des moules de fonderie, notamment en sable siliceux, par mise en forme d'un volume de sable est bien connue.The manufacture of foundry molds, in particular silica sand, by shaping a volume of sand is well known.
On place une feuille imperméable au gaz, telle qu'un film plastique, sur une forme dite modèle, elle-même placée sur un support permettant, par aspiration, le thermoformage du film plastique ; on place par dessus un cadre dit "châssis", équipé de dispositifs d'aspiration de l'air et de filtres destinés à retenir le sable, on remplit le volume ainsi déterminé de matériau granulaire que l'on peut compacter par vibrations; on place par dessus une nouvelle feuille de film plastique, puis, au travers du châssis, on aspire l'air emprisonné entre les deux films plastique et le châssis, ce qui a pour effet de donner de la cohésion aux grains.A gas-impermeable sheet, such as a plastic film, is placed on a so-called model form, itself placed on a support allowing, by suction, the thermoforming of the plastic film; a "frame" frame is placed over it, equipped with air suction devices and filters intended to retain the sand, the volume thus determined is filled with granular material which can be compacted by vibration; a new sheet of plastic film is placed over it, then, through the chassis, the air trapped between the two plastic films and the chassis is sucked in, which has the effect of giving cohesion to the grains.
L'empreinte est alors réalisée pour sa première moitié; on opère de façon identique pour réaliser la deuxième moitié et obtenir un moule prêt à la coulée. Une fois celle-ci réalisée, et après solidification du matériau coulé, la dépression est supprimée. Le sable est recyclé et le cycle recommence.The impression is then made for its first half; we operate identically to make the second half and get a mold ready for casting. Once this has been done, and after solidification of the cast material, the depression is eliminated. The sand is recycled and the cycle begins again.
On peut citer, pour illustrer une telle méthode, la demande de brevet français n° 2 156 138, qui décrit un dispositif pour l'obtention de moules de coulée de métal fondu.Mention may be made, to illustrate such a method, of French patent application No. 2 156 138 , which describes a device for obtaining molds for casting molten metal.
Dans ce cas, le châssis est composé de deux parties supérieure et inférieure identiques, comportant chacune des tubes d'évacuation d'air reliés à un passage à communication, lui-même relié à une pompe à vide.In this case, the chassis is composed of two identical upper and lower parts, each comprising air evacuation tubes connected to a communication passage, itself connected to a vacuum pump.
Les tubes sont répartis régulièrement, de façon à couvrir une surface importante.The tubes are distributed regularly, so as to cover a large surface.
La demande de brevet français n° 2 307 596 concerne un châssis de moules de fonderie dans lequel il est prévu un moyen d'introduction et de récupération du matériau granulaire utilisé. Le moyen est constitué d'un volume de forme sensiblement tronconique, la petite base étant munie d'une trappe à travers laquelle on peut introduire le tube de remplissage. Cette trappe est étanche à l'air et elle reste fermée durant toute l'utilisation du châssis. Après moulage, le vide est cassé, le châssis étant retourné, la trappe s'ouvre et laisse s'écouler le matériau par gravité.French patent application No. 2,307,596 relates to a frame of foundry molds in which there is provided a means for introducing and recovering the granular material used. The means consists of a volume of substantially frustoconical shape, the small base being provided with a hatch through which the filling tube can be introduced. This hatch is airtight and remains closed throughout the use of the chassis. After molding, the vacuum is broken, the chassis being turned over, the hatch opens and lets the material flow by gravity.
De tels méthodes et dispositifs ne confèrent au moulage que des cadences lentes, car il est nécessaire d'effectuer de nombreuses manutentions.Such methods and devices confer only slow rates on the molding, since it is necessary to carry out numerous handling operations.
Par ailleurs, la coulée s'effectue avec le moule réalisé par l'assemblage des deux châssis, ce qui immobilise deux châssis coûteux pour l'obtention d'un seul moule. De même, il est nécessaire d'effectuer deux fois l'opération de mise en forme pour obtenir les parties supérieure et inférieure du moule, seule cette double opération conduisant à l'obtention d'un moule complet. Deux films plastique distincts sont amenés verticalement sur deux plaques-modèles, elles-mêmes maintenues verticalement.Furthermore, the casting is carried out with the mold produced by assembling the two frames, which immobilizes two expensive frames for obtaining a single mold. Likewise, it is necessary to carry out the shaping operation twice to obtain the upper and lower parts of the mold, only this double operation leading to the production of a complete mold. Two separate plastic films are brought vertically onto two model plates, which are themselves held vertically.
On connaît déjà un dispositif et un procédé correspondant respectivement aux revendications 1 et 6 des brevets allemands DE-A-2.305.229 et DE-B-2.407.878. L'armature utilisée dans le dispositif est complexe, avec sa double paroi intérieure et les deux membranes qui l'entourent, l'aspiration d'air se faisant uniquement par les faces latérales ne peut intéresser de façon homogène, l'ensemble du matériau granulaire, compte-tenu des fuites qui se produisent. L'absence d'armatures pour la mise en oeuvre du procédé fait que l'aspiration quasi ponctuelle sur un ou deux côtés de la motte est très hétérogène et que la manutention de telles mottes, en vue de leur juxtaposition pour constituer les empreintes de coulée, est très délicate.There is already known a device and a method corresponding respectively to
La présente invention a pour but de remédier à ces inconvénients. L'invention, telle qu'elle est caractérisée dans les revendications, résout le problème consistant à créer un dispositif de fabrication de moules de fonderie en motte, à partir d'un matériau granulaire, en utilisant (effet de cohésion par le vide dans une enveloppe polymère épousant la forme de deux plaques-modèles disposées face à face, avec lequel il soit possible d'obtenir, sur une seule motte, les deux faces nécessaires à la réalisation d'empreintes de coulée par juxtaposition de mottes identiques, pour permettre une coulée continue avec une manutention très réduite.The present invention aims to remedy these drawbacks. The invention, as characterized in the claims, solves the problem of creating a device for manufacturing clodding molds, from a granular material, using (vacuum cohesion effect in a polymer envelope conforming to the shape of two model plates placed face to face, with which it is possible to obtain, on a single clod, the two faces necessary for making casting impressions by juxtaposition of identical clods, to allow continuous casting with very reduced handling.
Les avantages obtenus, grâce à cette invention, consistent essentiellement en ceci que :
seules l'armature et l'enveloppe polymère consommable sont utilisées au poste de coulée et l'armature selon l'invention étant de conception beaucoup plus simple que les châssis existants, le coût et l'investissement sont réduits d'autant.The advantages obtained, thanks to this invention, essentially consist in that:
only the armature and the consumable polymeric envelope are used at the casting station and the armature according to the invention being of a much simpler design than the existing frames, the cost and the investment are reduced accordingly.
Une seule opération permet d'obtenir avec une seule motte les deux faces nécessaires à la réalisation d'une empreinte de coulée ; seules les extrémités de l'alignement sont inutilisées, mais le rendement est néanmoins amélioré de près de 50% : on aura (n-1) empreintes pour n mottes.A single operation makes it possible to obtain with a single clod the two faces necessary for the production of a casting imprint; only the ends of the alignment are unused, but the yield is nevertheless improved by almost 50% : there will be (n-1) fingerprints for n clods.
Le procédé est semi-continu, mais la coulée peut être continue en juxtaposant les mottes. Le nombre de pièces nécessaires est réduit, tout comme le volume de matériau granulaire mis en oeuvre.The process is semi-continuous, but the casting can be continuous by juxtaposing the lumps. The number of parts required is reduced, as is the volume of granular material used.
L'invention va maintenant être décrite suivant un mode de réalisation particulier non limitatif en regard des figures annexées qui représentent :
- figure 1 : support articulé développé avec enveloppe polymère thermoformée en place,
- figure 2 : armature et montage sur le support représenté en trait mixte sur la figure 1,
- figure 3 : redressage des plaques-modèles du support articulé,
- figure 4 : remplissage, compactage, arasement,
- figure 5 : repliage de l'enveloppe, soudure, fermeture et mise sous-vide,
- figure 6 : ouverture du support articulé pour libérer la motte,
- figure 7 : juxtaposition des mottes pour former les empreintes complètes,
- figure 8 : variante d'ouverture du support par translation,
- figure 9 : variante de réalisation de l'armature.
- Figure 1: articulated support developed with thermoformed polymer envelope in place,
- FIG. 2: reinforcement and mounting on the support shown in phantom in FIG. 1,
- FIG. 3: straightening of the model plates of the articulated support,
- Figure 4: filling, compacting, leveling,
- Figure 5: folding of the envelope, welding, closing and evacuating,
- FIG. 6: opening of the articulated support to release the root ball,
- Figure 7: juxtaposition of clods to form the complete imprints,
- FIG. 8: variant of opening the support by translation,
- Figure 9: alternative embodiment of the frame.
Les figures 1 à 7 constituent le schéma synoptique de fabrication selon le procédé et avec un dispositif selon l'invention.Figures 1 to 7 constitute the block diagram of manufacturing according to the method and with a device according to the invention.
Sur la figure 1, on voit l'ensemble des 4 plaques constituant le support 1, deux plaques-modèles 10 et 11 et deux plaques d'étanchéité 12 et 13. Les plaques-modèles sont placées dans des logements 100 et 110 dans le support, de façon à ce que l'on puisse les changer en conservant la structure de base de ce support.In Figure 1, we see all 4 plates constituting the
Ces logements sont reliés aux plaques d'étanchéïté par des articulations 14, 15 et 16.These housings are connected to the sealing plates by
Ces plaques sont également munies chacune d'un raccord 101, 120, 111, 130, permettant la liaison avec une source à vide et/ou d'air comprimé, de façon connue. Les plaques sont réalisées à partir de plaques alésées, ou réalisées en matériau poreux, de façon à permettre l'aspiration lors du thermoformage et le'soufflage ultérieur pour le démoulage.These plates are also each provided with a
Les plaques étant placées horizontalement, on dispose à la surface une enveloppe polymère 17, de forme initiale plane, que l'on adapte par thermoformage sous aspiration au profil des plaques-modèles. Les plaques 10-13 sont montées de façon que les deux plaques-modèles soient face à face, la forme étant orientée vers l'intérieur. La plaque d'étanchéité 12 sert d'appui inférieur et reçoit l'armature 20. La plaque d'étanchéité 13 reste ouverte vers l'extérieur.The plates being placed horizontally, a
L'armature 20 est constituée de deux plaques opposées 21,22 reliées par deux tubes 23,24, les plaques étant munies de gorges 28,29. Les tubes sont d'une épaisseur suffisante pour donner à l'armature une grande rigidité.The
Les tubes 23 et 24 sont débouchants à l'intérieur d'un volume 25 à l'intérieur de la plaque 21, formant chambre commune, et à l'extérieur de cette plaque, il est prévu un raccord externe 26.The
Ce raccord peut être relié par toute conduite souple à une source à vide.This connector can be connected by any flexible pipe to a vacuum source.
On prévoit également des ergots de manutention, tels que 260, permettant le transport de l'armature.Handling lugs, such as 260 , are also provided for transporting the frame.
Ces tubes 23 et 24 sont munis de perforations 27 d'un diamètre tel qu'elles permettent le passage de l'air mais pas celui des grains du matériau granulaire dont il s'agira ultérieurement.These
On assure alors l'étanchéité entre l'armature et l'enveloppe par les gorges 28 et 29.Sealing is then ensured between the frame and the envelope by the
Selon une variante de réalisation de l'armature 201 (Fig.9), les plaques opposées 21 et 22 sont reliées par un unique conduit 230 de section rectangulaire, dont les flancs comportent une surface grillagée 270.According to an alternative embodiment of the frame 201 (FIG. 9), the
A la figure 4, on a schématisé le remplissage du dispositif constitué des plaques, de l'enveloppe et de l'armature par du sable 30 siliceux, du type de celui utilisé en fonderie, ou de tout autre matériau granulaire adapté. Ce remplissage s'effectue, par exemple, à l'aide d'une rehausse 31, tandis que l'ensemble dispositif et sable est soumis au compactage grâce à une table vibrante (non représentée), symbolisée par les flèches 32. De façon usuelle, on adaptera l'amplitude et la fréquence en fonction du matériau granulaire, des caractéristiques et des formes des plaques-modèles.In Figure 4 shows diagrammatically the filling device consisting of plates, the envelope and the reinforcement by
Simultanément, on a maintenu une dépression à la surface des plaques par l'intermédiaire d'une source à vide et des raccords 101, 120, 111, 130, ce qui a pour but de maintenir parfaitement plaquée l'enveloppe polymère sur les formes à reproduire.Simultaneously, a vacuum was maintained on the surface of the plates by means of a vacuum source and
L'effet combiné de ces deux actions conduit à la mise en forme du sable 30. On arase ensuite la face supérieure.The combined effect of these two actions leads to the shaping of the
A la figure 5, on rabat la dernière partie de l'enveloppe polymère sur le dessus de la motte avec la plaque d'étanchéité et l'on effectue une soudure 40 pour obtenir un volume fermé 41.In FIG. 5, the last part of the polymer envelope is folded over the top of the root ball with the sealing plate and a
On fait subir à l'ensemble un éventuel compactage par la plaque de fermeture inférieure et on applique une dépression à l'intérieur du volume fermé 41 par les tubes 23 et 24 reliés à une source à vide par le raccord 26.The assembly is subjected to any compaction by the lower closure plate and a vacuum is applied inside the closed volume 41 by the
A la figure 6, on a montré le retrait des plaques-modèles et des plaques d'étanchéité. Ce retrait est réalisé en supprimant la dépression et, au besoin, en introduisant, cette fois, une légère surpression pour faciliter le décollement. Ce retrait s'effectue par rotation, comme représenté à la figure 6, ou par translation, comme représenté à la figure 8.Figure 6 shows the removal of the model plates and sealing plates. This withdrawal is carried out by removing the depression and, if necessary, by introducing, this time, a slight overpressure to facilitate detachment. This removal is carried out by rotation, as shown in FIG. 6, or by translation, as shown in FIG. 8.
L'ensemble armature 20 et sable 30 dans l'enveloppe polymère forme la motte qui peut être transportée.The
Dans tous les cas, la dépression devra être maintenue jusqu'à solidification, pour compenser les fuites éventuelles, notamment celles dues à la détérioration de l'enveloppe polymère au moment de la coulée. Les mottes sont alors juxtaposées pour constituer des empreintes complètes, ainsi que représentées figure 7.In all cases, the vacuum must be maintained until solidification, to compensate for any leaks, in particular those due to the deterioration of the polymeric envelope at the time of casting. The clods are then juxtaposed to form complete imprints, as shown in Figure 7.
Les mottes se poussent les unes les autres sur l'aire de coulée, après mise en place de noyaux éventuels.The clods push each other on the pouring area, after installation of any cores.
On réalise, de façon classique, la coulée par des conduits réservés à cet usage, avec ou sans masselotte.Casting is carried out conventionally by conduits reserved for this use, with or without a counterweight.
Après solidification, le lot est transféré au poste de décochage qui permettra, par suppression de la dépression, de récupérer le produit coulé d'une part, l'armature et le sable d'autre part.After solidification, the batch is transferred to the release station which will, by removing the vacuum, recover the cast product on the one hand, the reinforcement and the sand on the other.
Ce dernier est recyclé, tandis que l'armature est ramenée au poste de fabrication des mottes.The latter is recycled, while the reinforcement is brought back to the clod manufacturing station.
On peut prévoir un procédé continu avec transfert et alimentation en motte une à une.A continuous process can be provided with transfer and clod supply one by one.
Dans ce type de fabrication de moules, on peut prévoir un serrage complémentaire par au moins la plaque d'étanchéité inférieure 12 et, éventuellement, la plaque d'étanchéité supérieure 13.In this type of mold making, additional tightening can be provided by at least the
Dans ce but, on place, sur les plaques d'étanchéité inférieure 12 et supérieure 13, un dispositif mécanique, ou pneumatique par exemple, destiné à déformer l'enveloppe polymère 17 et à refouler le sable 30. Cette opération est surtout utile dans les formes complexes.For this purpose, a mechanical or pneumatic device, for example, intended to deform, is placed on the lower 12 and upper 13 sealing plates. the
De même, les opérations connues dans la fonderie peuvent compléter le procédé selon l'invention.Likewise, the operations known in the foundry can complete the process according to the invention.
Ainsi, l'enveloppe polymère peut être recouverte d'une couche d'un produit particulier, destiné à faciliter le décochage par exemple.Thus, the polymeric envelope can be covered with a layer of a particular product, intended to facilitate release, for example.
De même, lors du compactage, on pourra faire varier la direction des vibrations pour obtenir'une meilleure qualité de compactage.Likewise, during compaction, the direction of the vibrations can be varied to obtain a better quality of compaction.
Quant aux procédé et dispositif pour assurer l'étanchéïté entre l'armature et l'enveloppe, une variante de l'invention propose de réaliser une gorge périphérique sur les plaques d'extrémité de l'armature, que l'on met en relation avec la chambre commune de mise en dépression. Quant au support, il comporte, sur les bords correspondants, un joint gonflable.As for the method and device for ensuring the seal between the frame and the envelope, a variant of the invention proposes to produce a peripheral groove on the end plates of the frame, which is put in relation with the common depression room. As for the support, it comprises, on the corresponding edges, an inflatable seal.
Le procédé consiste, avant l'introduction du sable, à presser le bord de l'enveloppe polymère dans la gorge par le joint gonflable, à effectuer les opérations de remplissage, compactage, arasement, soudage, puis à mettre en dépression le sable et la chambre commune, ce qui plaque le bord de l'enveloppe dans la gorge, le support et les plaques peuvent être aisément retirés.The process consists, before the introduction of the sand, in pressing the edge of the polymeric envelope in the groove by the inflatable seal, in carrying out the operations of filling, compacting, leveling, welding, then in depressurizing the sand and the common room, which plates the edge of the envelope in the groove, the support and the plates can be easily removed.
De même, l'invention propose une variante pour la réalisation des tubes. Ceux-ci peuvent être creux, de section carrée ou rectangulaire. Sur les faces latérales, on rapporte une plaque microporeuse, ou alésée, à une certaine distance de la surface du tube, notamment grâce à des ergots filants. On définit ainsi deux couloirs parallèles au tube central.Likewise, the invention proposes a variant for producing the tubes. These can be hollow, of square or rectangular section. On the lateral faces, a microporous or bored plate is added at a certain distance from the surface of the tube, in particular by means of threaded lugs. Two corridors parallel to the central tube are thus defined.
La maintenance en est facilitée et la plaque filtrante peut être changée facilement, quant aux coûts, ils sont réduits, puisque la plaque est plane.Maintenance is facilitated and the filter plate can be changed easily, as for costs, they are reduced, since the plate is flat.
De la même façon, le procédé permet d'utiliser une armature à trois faces, avec deux plaques-modèles articulées autour d'une plaque de fermeture, deux feuilles polymères, que l'on soude en partie supérieure après remplissage et compactage, avant de mettre le contenu sous vide.In the same way, the method makes it possible to use a three-sided reinforcement, with two model plates articulated around a closure plate, two polymer sheets, which are welded in the upper part after filling and compacting, before vacuum the contents.
Claims (8)
- Device for manufacturing foundry moulds as boxless moulds, from a granular material such as silica sand (30), using the cohesion-by-vacuum effect in a polymer envelope matching the shape of two pattern plates (10, 11) arranged face to face, the said device comprising, in addition to the pattern plates (10, 11), gasket sheets (12, 13) interposed between the pattern plates (10, 11), an armature (20) intended to retain the pattern plates (10, 11) and the gasket sheets (12, 13) and to allow the manipulation of the boxless mould, at least one polymer envelope (17), evacuating tubes (23, 24) integrated with the armature (20), a means for filling with granular material and external evacuating means, characterised in that it comprises at least two pattern plates (10, 11) placed in housings (100, 110) of a support (1) including a bottom gasket sheet (12) placed between the housings (100, 110) of the pattern plates (10, 11), in that the armature comprises at most three faces delimiting, with the pattern plates (10, 11), the form of the boxless mould and in that the polymer envelope (17) is unique and covers the surface of the pattern plates (10, 11) and of the gasket sheets (12, 13).
- Device according to Claim 1, characterised in that it comprises an upper gasket sheet (12).
- Device according to Claim 1, characterised in that the housings (100, 110) of the pattern plates (10, 11) and the gasket sheets (12, 13) are articulated to one another.
- Device according to Claim 1, characterised in that the armature (20) comprises two opposing plates (21, 22), connected together by tubes (23, 24) or by a duct (230) with a grillage (270) for the evacuation of air.
- Device according to Claim 1, characterised in that the support (1) of the plates and sheets (10, 11, 12, 13) comprises an inflatable seal which is intended to flatten the polymer envelope (17) into grooves (28, 29) made on the sides of the opposed plates (21, 22) of the armature (20) under the effect of the suction exerted by the perforated (27) tubes (23, 24) via a volume (25) made in one of the plates (21) of the armature (20).
- Method for implementing the device according to Claims 1 to 5, in order to obtain, on a single boxless mould, two faces necessary for producing a casting cavity by juxtaposing two identical boxless moulds, characterised in that it comprises the following steps:- mounting two corresponding pattern plates (10, 11) in their respective housings (100, 110),- positioning, on the pattern plates (10, 11) and gasket sheets (12, 13), a polymer envelope (17), by thermoforming and suction through the plates,- positioning pattern plates (10, 11) and gasket sheets (12, 13) around an armature (20) comprising two plates (21, 22),- achieving sealing between the armature (20) and the plates and sheets (10, 11, 12, 13) by clamping or by flattening the envelope (17) into the grooves (28, 29) of the plates (21, 22) of the armature by inflating the seal,- filling with the granular material, compacting and strickling,- assembling the ends of the polymer envelope, by welding two ends of the sheet,- evacuating the volume contained in the envelope via the armature,- withdrawing the plates,- assembling by juxtaposition of boxless moulds obtained, in order to constitute a series of cavities.
- Method according to Claim 6, characterised in that complementary clamping is achieved on the sand/envelope assembly by exerting a thrust on at least one of the gasket sheets in a portion provided so as to be flexible, so that, under the effect of the depression, this additional deformation remains permanent.
- Method according to Claim 7, characterised in that this thrust is exerted at the same time as additional compacting, with or without vibration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88907004T ATE84736T1 (en) | 1987-07-22 | 1988-07-20 | METHOD AND DEVICE FOR THE MANUFACTURE OF MOLDS WITH GRANULATED MATERIAL. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8710514 | 1987-07-22 | ||
| FR8710514A FR2618358B1 (en) | 1987-07-22 | 1987-07-22 | METHOD AND DEVICE FOR MANUFACTURING MOLDS FROM GRANULAR MATERIAL |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0324840A1 EP0324840A1 (en) | 1989-07-26 |
| EP0324840B1 true EP0324840B1 (en) | 1993-01-20 |
Family
ID=9353522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88907004A Expired - Lifetime EP0324840B1 (en) | 1987-07-22 | 1988-07-20 | Method and device for fabricating moulds from granular material |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4940071A (en) |
| EP (1) | EP0324840B1 (en) |
| JP (1) | JPH02500096A (en) |
| AT (1) | ATE84736T1 (en) |
| AU (1) | AU2121688A (en) |
| CA (1) | CA1334782C (en) |
| DE (1) | DE3877736T2 (en) |
| FR (1) | FR2618358B1 (en) |
| WO (1) | WO1989000467A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2672233B1 (en) * | 1991-02-01 | 1993-05-07 | Mazeran Jean Jacques | DEVICE AND METHOD FOR MANUFACTURING FOUNDRY MOLDS OF GRANULAR MATERIAL. |
| ZA923274B (en) * | 1991-05-06 | 1993-11-08 | Du Pont | Process for the manufacture of pentafluoroethane |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE789785A (en) * | 1971-10-08 | 1973-02-01 | Akita Kk | MOLD PRODUCTION APPARATUS |
| DE2305229C3 (en) * | 1972-02-04 | 1975-04-17 | Sintokogio, Ltd., Nagoya, Aichi (Japan) | Molding box |
| DE2407878C2 (en) * | 1974-02-19 | 1975-12-18 | Heinrich Wagner, Maschinenfabrik, 5928 Laasphe | Boxless mold |
| JPS5111018A (en) * | 1974-07-19 | 1976-01-28 | Janome Sewing Machine Co Ltd | INBESUTOMENTOCHUZOHONIOKERU MOKEIKUMITATEHOHO |
| DE2516158C3 (en) * | 1975-04-14 | 1978-06-22 | Heinrich Wagner Maschinenfabrik, 5928 Laasphe | Molding box for vacuum-bound casting molds |
| SU534291A1 (en) * | 1975-07-25 | 1976-11-05 | Институт Проблем Литья Ан Украинской Сср | Foundry tooling |
| JPS5570442A (en) * | 1978-11-20 | 1980-05-27 | Sintokogio Ltd | Forming method of film for vacuum core making |
| JPS58221631A (en) * | 1982-06-18 | 1983-12-23 | Hitachi Ltd | Casting method |
| DE3320881A1 (en) * | 1983-06-09 | 1984-12-13 | Buderus Ag, 6330 Wetzlar | Process for the production of a casting mould |
| SU1311840A1 (en) * | 1985-03-07 | 1987-05-23 | Предприятие П/Я Г-4874 | Casting tool for making,,particularly,,large-size cores by vacuum-film moulding |
-
1987
- 1987-07-22 FR FR8710514A patent/FR2618358B1/en not_active Expired - Fee Related
-
1988
- 1988-07-20 JP JP63506221A patent/JPH02500096A/en active Pending
- 1988-07-20 WO PCT/FR1988/000377 patent/WO1989000467A1/en active IP Right Grant
- 1988-07-20 AU AU21216/88A patent/AU2121688A/en not_active Abandoned
- 1988-07-20 US US07/350,734 patent/US4940071A/en not_active Expired - Fee Related
- 1988-07-20 DE DE8888907004T patent/DE3877736T2/en not_active Expired - Fee Related
- 1988-07-20 AT AT88907004T patent/ATE84736T1/en not_active IP Right Cessation
- 1988-07-20 EP EP88907004A patent/EP0324840B1/en not_active Expired - Lifetime
-
1989
- 1989-01-13 CA CA000588173A patent/CA1334782C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| AU2121688A (en) | 1989-02-13 |
| EP0324840A1 (en) | 1989-07-26 |
| JPH02500096A (en) | 1990-01-18 |
| DE3877736D1 (en) | 1993-03-04 |
| WO1989000467A1 (en) | 1989-01-26 |
| CA1334782C (en) | 1995-03-21 |
| FR2618358A1 (en) | 1989-01-27 |
| DE3877736T2 (en) | 1993-08-19 |
| US4940071A (en) | 1990-07-10 |
| ATE84736T1 (en) | 1993-02-15 |
| FR2618358B1 (en) | 1991-01-18 |
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