EP0497650B1 - Installation of and method for producing foundry moulds with granulated material - Google Patents
Installation of and method for producing foundry moulds with granulated material Download PDFInfo
- Publication number
- EP0497650B1 EP0497650B1 EP92400134A EP92400134A EP0497650B1 EP 0497650 B1 EP0497650 B1 EP 0497650B1 EP 92400134 A EP92400134 A EP 92400134A EP 92400134 A EP92400134 A EP 92400134A EP 0497650 B1 EP0497650 B1 EP 0497650B1
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- Prior art keywords
- grate
- boxes
- pattern
- box
- plates
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- 239000008187 granular material Substances 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 238000009434 installation Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 5
- 229920006255 plastic film Polymers 0.000 claims description 4
- 239000002985 plastic film Substances 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 239000004576 sand Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 238000003856 thermoforming Methods 0.000 claims description 2
- 230000000181 anti-adherent effect Effects 0.000 claims 1
- 239000003911 antiadherent Substances 0.000 claims 1
- 238000005520 cutting process Methods 0.000 claims 1
- 239000004033 plastic Substances 0.000 claims 1
- 229920006254 polymer film Polymers 0.000 abstract description 5
- 238000005192 partition Methods 0.000 abstract 2
- 230000002787 reinforcement Effects 0.000 description 7
- 238000007789 sealing Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 241001508691 Martes zibellina Species 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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 and a method for continuously manufacturing foundry molds made of granular material.
- French patent application No. 2,307,596 describes a frame of foundry molds, in which there is provided a means for introducing and recovering the granular material used.
- This means consists of a volume of substantially frustoconical shape, the small base of which is provided with a hatch through which the filling tube can be introduced; this hatch is airtight and remains closed throughout the period of use of the chassis. After molding, the vacuum is broken, the chassis being turned over, and the hatch opens, letting the material flow by gravity.
- Such a device and such a method confer, on molding, only slow rates, because it is necessary to carry out numerous handling operations. Furthermore, the casting takes place with the mold held in the assembly of the two chassis, which immobilizes two expensive chassis 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, this double operation leading to obtaining a complete mold.
- the device in question is distinguished from the similar ones by the fact that 'It consists of at least two model plates, placed in the corresponding housings of a support, and at least one sealing plate and a frame comprising two faces.
- the model plate support elements and the sealing plates are hinged together.
- the polymer sheet is unique and corresponds to the surface of the sealing plates and the model plates.
- the process essentially consists of preparing the model plates in the support, placing on them a polymeric envelope by thermoforming and aspiration through the plates, placing the model plates around of a reinforcement comprising, at most, three faces, to ensure the seal between the polymer envelope and the reinforcement, by clamping the film between reinforcement and plates, or by plating thereof on the reinforcement by inflation d '' a joint, to ensure the filling with granular material, to assemble, by welding, the ends of said envelope, over the upper frame, to evacuate the space delimited by the polymeric envelope through of the armature, to remove the plates and to assemble the lumps, thus obtained, for the constitution of imprints.
- This process and this device make it possible to obtain movements with reduced handling.
- only the reinforcement and the polymeric envelope are used at the casting station and the reinforcement is much simpler than the chassis previously used, hence a fairly reduced investment.
- a single operation makes it possible to obtain the two parts of a mold, which therefore improves the yield by almost 50%.
- 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.
- the device and the method according to the invention aim to remedy these drawbacks by proposing a support for model plates with sliding and pivoting boxes, connected to a vacuum source, capable of pressing against the frame, after interposition of a polymer film, with plating, in superposition, of the upper ends thereof against the top of the frame, under the effect of air pressure and depression.
- the device according to the invention is characterized mainly by the fact that the support for model plates consists mainly of two boxes, with two compartments, each connected to a source of vacuum, capable of sliding and pivoting. 'towards each other, relative to a frame surrounding a vibrating table on which is placed a three-sided frame, connected to the vacuum source.
- each box is made to the dimensions of a model plate, which ensures closing by embedding in a rebate provided for this purpose in the edge of the opening of said box.
- each box is completely closed and has, in its wall located in the extension of the model plate, air passage holes.
- the width of the small compartment is determined according to that of the frame and corresponds approximately to 2/3 of it.
- the boxes slide and pivot by means of two pins, arranged laterally in the median plane of each box, and of lights, forming slides, arranged at the upper part of the frame.
- the frame is formed of the three faces of a rectangular parallelogram, the upper face of which is absent, the vertical faces of which, connected by a hollow central rib covered with a microperforated filter, each comprise, in addition to a filtering device, a mouthpiece vacuum, equipped with a non-return valve, a handling pin, a support shoe, for clamping on the vibrating table, and a machined surface, intended to serve as a geometric reference for the molded parts.
- the figures represent a device for the continuous production of foundry molds in granular material, according to the invention, comprising a frame 10 with lights 11 , supporting, by means of pins 31 , 41 , boxes 30 and 40 at large compartments 32 , 42 with rebates 321 , 421 , in which the model plates 50 , 60 fit, and with small compartments 33 , 43 with air passage orifices 331 , 431 ; said boxes being connected to a vacuum source, respectively, by flexible pipes 322 , 422 and 332 , 432 central, by solenoid valves 323 , 423 , 333 , 433 ; the assembly being arranged around a frame 70 with faces 71 , 72 , 73 , connected by a hollow rib 74 with a microperforated filter 741 , placed in communication with the vacuum source by means of a nozzle 75 , provided with trunnions handling 76 , support shoes 77 and a machined surface 78 .
- pins 31 and 41 on the sides of the boxes 30 and 40 and the introduction of these into the slots 11 of the frame 10 allow, as shown in FIGS. 2 to 4, easy tilting and sliding of the boxes 30 and 40 supporting the model plates 50 and 60 , which allow their approximation or their spacing relative to the frame 70 resting, by its base 73 , on the vibrating table 80 .
- the ends 911 and 921 of the polymer films can be folded over the upper part 101 of the clod 100 made of granular material, with superimposition of the edges before application of the vacuum in the hollow rib 74 of the frame by means of the end pieces 75 , and after the vibrating table is put into operation, following the filling of the gap between model plates with granular material.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
Description
La présente invention a pour objet un dispositif et un procédé de fabrication, en continu, de moules de fonderie en matériau granulaire.The subject of the present invention is a device and a method for continuously manufacturing foundry molds made of granular material.
La demande de brevet français n° 2 307 596 décrit un châssis de moules de fonderie, dans lequel il est prévu un moyen d'introduction et de récupération du matériau granulaire utilisé. Ce moyen est constitué d'un volume de forme sensiblement tronconique, dont la petite base est munie d'une trappe à travers laquelle on peut introduire le tube de remplissage ; cette trappe est étanche à l'air et reste fermée durant toute la durée d'utilisation du châssis. Après moulage, le vide est cassé, le châssis étant retourné, et la trappe s'ouvre, laissant s'écouler le matériau par gravité.French patent application No. 2,307,596 describes a frame of foundry molds, in which there is provided a means for introducing and recovering the granular material used. This means consists of a volume of substantially frustoconical shape, the small base of which is provided with a hatch through which the filling tube can be introduced; this hatch is airtight and remains closed throughout the period of use of the chassis. After molding, the vacuum is broken, the chassis being turned over, and the hatch opens, letting the material flow by gravity.
Un tel dispositif et une telle méthode ne confèrent, au moulage, que des cadences lentes, car il est nécessaire d'effectuer de nombreuses manutentions. Par ailleurs, la coulée s'effectue avec le moule maintenu dans l'ensemble 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, cette double opération conduisant à l'obtention d'un moule complet.Such a device and such a method confer, on molding, only slow rates, because it is necessary to carry out numerous handling operations. Furthermore, the casting takes place with the mold held in the assembly of the two chassis, which immobilizes two expensive chassis 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, this double operation leading to obtaining a complete mold.
On connaît déjà un dispositif et un procédé permettant de pallier, en partie, à ces inconvénients, tels que ceux décrits dans la demande de brevet français n° 2 618 358. Le dispositif dont il s'agit se distingue des similaires par le fait qu'il est constitué d'au moins deux plaques-modèles, placées dans les logements correspondants d'un support, et d'au moins une plaque d'étanchéité et d'une armature comportant deux faces. Les éléments du support de plaques-modèles et les plaques d'étanchéité sont articulés entre eux. La feuille polymère est unique et correspond à la surface des plaques d'étanchéité et des plaques-modèles.A device and a method are already known which make it possible to overcome, in part, these drawbacks, such as those described in French patent application No. 2 618 358. The device in question is distinguished from the similar ones by the fact that 'It consists of at least two model plates, placed in the corresponding housings of a support, and at least one sealing plate and a frame comprising two faces. The model plate support elements and the sealing plates are hinged together. The polymer sheet is unique and corresponds to the surface of the sealing plates and the model plates.
Le procédé consiste, pour l'essentiel, à préparer les plaques-modèles dans le support, à mettre en place, sur celles-ci, une enveloppe polymère par thermoformage et aspiration à travers les plaques, à mettre en place les plaques-modèles autour d'une armature comportant, au plus, trois faces, à assurer l'étanchéité entre l'enveloppe polymère et l'armature, par serrage du film entre armature et plaques, ou par placage de celui-ci sur l'armature par gonflage d'un joint, à assurer le remplissage avec du matériau granulaire, à assembler, par soudage, les extrémités de la dite enveloppe, par dessus l'armature supérieure, à mettre sous vide l'espace délimité par l'enveloppe polymère par l'intermédiaire de l'armature, à retirer les plaques et à assembler les mottes, ainsi obtenues, pour la constitution d'empreintes.The process essentially consists of preparing the model plates in the support, placing on them a polymeric envelope by thermoforming and aspiration through the plates, placing the model plates around of a reinforcement comprising, at most, three faces, to ensure the seal between the polymer envelope and the reinforcement, by clamping the film between reinforcement and plates, or by plating thereof on the reinforcement by inflation d '' a joint, to ensure the filling with granular material, to assemble, by welding, the ends of said envelope, over the upper frame, to evacuate the space delimited by the polymeric envelope through of the armature, to remove the plates and to assemble the lumps, thus obtained, for the constitution of imprints.
Ce procédé et ce dispositif permettent d'obtenir des mouvements avec des manutentions réduites. Par ailleurs, seules l'armature et l'enveloppe polymère sont utilisées au poste de coulée et l'armature est beaucoup plus simple que les châssis utilisés antérieurement, d'où un investissement assez réduit. De plus, une seule opération permet d'obtenir les deux parties d'un moule, ce qui améliore donc le rendement de près de 50 %. 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.This process and this device make it possible to obtain movements with reduced handling. In addition, only the reinforcement and the polymeric envelope are used at the casting station and the reinforcement is much simpler than the chassis previously used, hence a fairly reduced investment. In addition, a single operation makes it possible to obtain the two parts of a mold, which therefore improves the yield by almost 50%. 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.
Toutefois, l'utilisation d'une armature à deux faces ne se prête guère à la manutention sur rouleaux et l'importance des courses et des masses à mouvoir limite les performances.However, the use of a two-sided frame hardly lends itself to handling on rollers and the importance of the strokes and of the masses to move limits the performances.
Le dispositif et le procédé selon l'invention visent à remédier à ces inconvénients en proposant un support de plaques-modèles à caissons coulissants et pivotants, reliés à une source de vide, susceptibles de venir se plaquer contre l'armature, après interposition d'un film polymère, avec placage, en superposition, des extrémités supérieures de celui-ci contre le dessus de l'armature, sous l'effet d'une pression et d'une dépression d'air.The device and the method according to the invention aim to remedy these drawbacks by proposing a support for model plates with sliding and pivoting boxes, connected to a vacuum source, capable of pressing against the frame, after interposition of a polymer film, with plating, in superposition, of the upper ends thereof against the top of the frame, under the effect of air pressure and depression.
Le dispositif selon l'invention se caractérise, principalement, en ce que le support de plaques-modèles est constitué, principalement, de deux caissons, à deux compartiments, reliés, chacun, à une source de vide, capables de coulisser et de pivoter l'un vers l'autre, par rapport à un bâti entourant une table vibrante sur laquelle est placée une armature à trois faces, reliée à la source de vide.The device according to the invention is characterized mainly by the fact that the support for model plates consists mainly of two boxes, with two compartments, each connected to a source of vacuum, capable of sliding and pivoting. 'towards each other, relative to a frame surrounding a vibrating table on which is placed a three-sided frame, connected to the vacuum source.
Le grand compartiment de chaque caisson est réalisé aux dimensions d'une plaque-modèle, qui en assure la fermeture par encastrement dans une feuillure prévue à cet effet dans le bord de l'ouverture dudit caisson.The large compartment of each box is made to the dimensions of a model plate, which ensures closing by embedding in a rebate provided for this purpose in the edge of the opening of said box.
Le petit compartiment de chaque caisson est entièrement clos et comporte, dans sa paroi située dans le prolongement de la plaque-modèle, des orifices de passage d'air.The small compartment of each box is completely closed and has, in its wall located in the extension of the model plate, air passage holes.
La largeur du petit compartiment est déterminée en fonction de celle de l'armature et correspond environ aux 2/3 de celle-ci.The width of the small compartment is determined according to that of the frame and corresponds approximately to 2/3 of it.
Les caissons coulissent et pivotent par l'intermédiaire de deux tourillons, disposés latéralement dans le plan médian de chaque caisson, et de lumières, formant glissières, aménagées à la partie supérieure du bâti.The boxes slide and pivot by means of two pins, arranged laterally in the median plane of each box, and of lights, forming slides, arranged at the upper part of the frame.
L'armature est formée des trois faces d'un parallélogramme rectangle, dont la face supérieure est absente, dont les faces verticales, reliées par une nervure centrale creuse recouverte d'un filtre microperforé, comportent, chacune, outre un dispositif de filtrage, un embout de mise sous vide, muni d'un clapet anti-retour, un tourillon de manutention, un sabot d'appui, pour le bridage sur la table vibrante, et une surface usinée, destinée à servir de référence géométrique aux pièces moulées.The frame is formed of the three faces of a rectangular parallelogram, the upper face of which is absent, the vertical faces of which, connected by a hollow central rib covered with a microperforated filter, each comprise, in addition to a filtering device, a mouthpiece vacuum, equipped with a non-return valve, a handling pin, a support shoe, for clamping on the vibrating table, and a machined surface, intended to serve as a geometric reference for the molded parts.
Le procédé de mise en oeuvre du dispositif selon l'invention se caractérise, principalement, en ce qu'il consiste, après avoir disposé le bâti autour de la table vibrante, à :
- mettre les caissons en position horizontale,
- encastrer une plaque-modèle dans chacune des feuillures des grands compartiments de chaque caisson,
- thermoformer, sur chaque plaque-modèle, un film en matière plastique, débordant par dessus chaque petit compartiment des caissons,
- mettre les deux compartiments de chaque caisson en communication avec la source de vide, par action sur les électrovannes,
- pulvériser, éventuellement, sur la surface de chaque film, un produit anti-adhérent,
- disposer l'armature sur la table vibrante, après avoir écarté, puis fait pivoter les caissons en position verticale,
- plaquer les plaques-modèles contre l'armature, par coulissement des tourillons dans les lumières du bâti,
- solidariser les caissons à la table vibrante, soit directement, soit grâce à un bâti intermédiaire,
- remplir, avec un matériau granulaire, l'espace laissé libre entre les deux plaques-modèles, la table vibrante étant en action,
- mettre le petit compartiment de chaque caisson à la pression atmosphérique, par action sur les électrovannes,
- replier chacune des extrémités du film plastique, qui recouvrait chaque petit compartiment du caisson, contre le dessus de la motte de sable,
- mettre la nervure creuse de l'armature en communication avec la source de vide, pour obtenir la rigidification de la motte,
- couper le vide dans les grands compartiments des caissons par l'intermédiaire des électrovannes correspondantes et reculer ceux-ci afin de libérer l'armature,
- évacuer la motte vers la ligne de coulée, en maintenant l'armature sous dépression,
- ramener les caissons en position horizontale pour un nouveau cycle d'opération.
- put the boxes in a horizontal position,
- embed a model plate in each of the rebates of the large compartments of each box,
- thermoform, on each model plate, a plastic film, overflowing over each small compartment of the boxes,
- put the two compartments of each box in communication with the vacuum source, by action on the solenoid valves,
- spray, if necessary, on the surface of each film, a non-stick product,
- place the frame on the vibrating table, after having moved away, then rotates the boxes in a vertical position,
- press the model plates against the frame, by sliding the pins in the lights of the frame,
- secure the boxes to the vibrating table, either directly or through an intermediate frame,
- fill, with a granular material, the space left free between the two model plates, the vibrating table being in action,
- put the small compartment of each box at atmospheric pressure, by action on the solenoid valves,
- fold each end of the plastic film, which covered each small compartment of the box, against the top of the clod of sand,
- put the hollow rib of the armature in communication with the vacuum source, in order to stiffen the root ball,
- cut the vacuum in the large compartments of the boxes through the corresponding solenoid valves and move them back in order to release the armature,
- evacuate the root ball towards the casting line, keeping the reinforcement under vacuum,
- return the boxes to the horizontal position for a new operating cycle.
Les avantages obtenus grâce à cette invention consistent, essentiellement, en ceci que, grâce à la réduction des courses et des masses en mouvement, les performances sont améliorées. La présence d'une face de fond sur l'armature facilite, par ailleurs, un certain nombre de manutention.The advantages obtained thanks to this invention consist, essentially, in that, thanks to the reduction of the strokes and of the masses in movement, the performances are improved. The presence of a bottom face on the frame also facilitates a certain number of handling operations.
Les caractéristiques et avantages apparaîtront dans la description qui va suivre du dispositif mis en oeuvre selon le procédé de l'invention, donné à titre d'exemple non limitatif au regard des dessins annexés sur lesquels :
- la figure 1 représente le dispositif en position initiale, film plastique en place,
- la figure 2 représente la seconde étape du procédé, correspondant au basculement, à la verticale, des plaques-modèles et à la mise en place de l'armature,
- la figure 3 représente la troisième étape du procédé, correspondant au rapprochement des plaques-modèles et au repliage de l'extrémité du film,
- la figure 4 représente la quatrième étape du procédé, correspondant à la libération de l'armature, par recul des plaques-modèles, après constitution de la motte,
- la figure 5 représente une vue en perspective de l'armature.
- FIG. 1 represents the device in the initial position, plastic film in place,
- FIG. 2 represents the second step of the process, corresponding to the tilting, vertically, of the model plates and to the positioning of the frame,
- FIG. 3 represents the third step of the process, corresponding to the approximation of the model plates and to the folding of the end of the film,
- FIG. 4 represents the fourth step of the method, corresponding to the release of the frame, by retraction of the model plates, after constitution of the root ball,
- Figure 5 shows a perspective view of the frame.
Les figures représentent un dispositif de fabrication, en continu, de moules de fonderie en matière granulaire, selon l'invention, comportant un bâti 10 à lumières 11, supportant, par l'intermédiaire de tourillons 31, 41, des caissons 30 et 40 à grands compartiments 32, 42 à feuillures 321, 421, dans lesquelles s'encastrent les plaques-modèles 50, 60, et à petits compartiments 33, 43 à orifices de passage d'air 331, 431 ; les dits caissons étant reliés à une source de vide, respectivement, par des tuyauteries souples 322, 422 et 332, 432 centrales, par des électrovannes 323, 423, 333, 433 ; l'ensemble étant disposé autour d'une armature 70 à faces 71, 72, 73, reliés par une nervure creuse 74 à filtre microperforé 741, mise en communication avec la source de vide par l'intermédiaire d'un embout 75, muni de tourillons de manutention 76, de sabots d'appui 77 et d'une surface usinée 78.The figures represent a device for the continuous production of foundry molds in granular material, according to the invention, comprising a
En examinant plus en détail les figures 1 à 4, on remarque que la mise en position horizontale des caissons 30 et 40 permet un encastrement aisé des plaques-modèles 50 et 60 dans les feuillures 321 et 421 des grands compartiments 32 et 42 et une mise en place facile d'un film polymère 91, 92 sur les plaques-modèles et sur les petits compartiments 33 et 43, à l'aide de la dépression exercée dans l'ensemble des compartiments par l'intermédiaire des tuyauteries souples 322, 422, 332, 432, par action sur les électrovannes 323, 423, 333, 433. La pulvérisation d'un produit sur la surface du film polymère, suivie d'un séchage rapide, sont d'autant facilités par cette présentation horizontale.By examining Figures 1 to 4 in more detail, it can be seen that the placing of the
L'existence de tourillons 31 et 41 sur les côtés des caissons 30 et 40 et l'introduction de ceux-ci dans les lumières 11 du bâti 10 permettent, comme le montre les figures 2 à 4, un basculement et un coulissement aisés des caissons 30 et 40 supportant les plaques-modèles 50 et 60, qui permettent leur rapprochement ou leur écartement par rapport à l'armature 70 reposant, par sa base 73, sur la table vibrante 80.The existence of
En examinant plus particulièrement la figure 3, on remarque que, sous réserve d'avoir, préalablement, cassé le vide dans les petits compartiments 33 et 43 des caissons, les extrémités 911 et 921 des films polymères peuvent être rabattues sur la partie supérieure 101 de la motte 100 en matériau granulaire, avec superposition des bords avant application du vide dans la nervure creuse 74 de l'armature par l'intermédiaire des embouts 75, et après mise en fonction de la table vibrante, faisant suite au remplissage de l'intervalle entre plaques-modèles avec du matériau granulaire.By examining more particularly FIG. 3, it is noted that, subject to having previously broken the vacuum in the
Claims (7)
- Device for the production of foundry moulds, made in particular from granular material, comprising pattern-plates, tightness plates, a grate, at least one polymer envelope, a means for supplying granular material, and means for placing under vacuum consisting of at least two pattern-plates, placed in the housings of a support, the grate comprising, at most, three faces, characterized in that the support of the pattern-plates (50, 60) consists, principally, of two boxes (30,40) having two compartments (32, 42 and 33, 43) each connected to a vacuum source, capable of sliding and pivoting one towards the other, relative to a frame (10) surrounding a vibrating table (80) on which is placed a grate (70) having three faces (71, 72, 73), connected to the vacuum source.
- Device according to claim 1, characterized in that the large compartment (32, 42) of each box (30, 40) is made with the dimensions of a pattern-plate (50, 60), which ensures its closure by means of fitting into a rebate (321, 421) provided for this purpose in the edge of the opening of the said compartment (32, 42).
- Device according to claim 1, characterized in that the small compartment (33, 43) of each box (30, 40) is entirely enclosed and includes, in its wall situated in the extension of the pattern-plate, air-passage orifices (331, 431).
- Device according to claim 3, characterized in that the width of the small compartment (33, 43) of each box (30, 40) corresponds approximately to 2/3 of the width of the grate (70).
- Device according to claim 1, characterized in that the boxes (30, 40) slide and pivot by means of two journals (31, 41) disposed laterally in the median plane of each box (30, 40), and horizontal holes (11), forming slides, worked in the upper part of the frame (10).
- Device according to claim 1, characterized in that the grate is formed by three faces (71, 72, 73) of a rectangular parallelogram, the upper face of which is absent, and the vertical faces (71, 72) of which, connected by a hollow central rib (74) covered by a microperforated film (741), each comprise, apart from a filtering device, a mouthpiece (75) for placing under vacuum fitted with a non-return valve, a handling journal (76), a support block (77) for clamping on the vibrating table, and a machined surface (78), intended to serve as a geometric reference for the moulded articles.
- Process for using the device according to claims 1 to 6, characterized in that, after having disposed the frame (10) around the vibrating table (80), it principally comprises:- placing the boxes in a horizontal position,- fitting a pattern-plate (50, 60) into each of the rebates (321, 421) of the large compartments of each box (30, 40),- thermoforming, on each pattern-plate (50, 60), a film of plastic material (91, 92), extending above beyond each small compartment (33, 43),- placing the two compartments of each box in communication with the vacuum source, by acting on the electro-valves (323, 423, 333, 433),- optionally, spraying an anti-adherent product onto the surface of each film (91, 92),- arranging the grate (70) on the vibrating table (80), after having moved away and then pivoted the boxes into a vertical position,- sticking the pattern-plates against the grate, by sliding the journals (31, 41) of the boxes (30, 40) into the holes (11) of the frame (10),- integrating the boxes (30, 40) with the vibrating table (80), either directly or by means of an intermediate frame (not shown),- filling the space left free between the two pattern-plates (50, 60) with a granular material, the vibrating table being in action,- setting the small compartments (33, 43) of each box (30, 40) to atmospheric pressure, by acting on the electro-valves (333, 433),- folding each of the extremities of the plastic film, which covered each small compartment of the box, against the top of the mass of sand,- placing the hollow rib (74) of the grate in communication with the vacuum source, to obtain the rigidification of the mass,- cutting off the vacuum in the large compartments (32, 42) of the boxes (30, 40) by means of the corresponding electrovalves (323, 423) and moving these back in order to free the grate,- removing the mass to the casting line, keeping the grate under reduced pressure,- returning the boxes (30, 40) to a horizontal position for a new operating cycle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9101180 | 1991-02-01 | ||
| FR9101180A FR2672233B1 (en) | 1991-02-01 | 1991-02-01 | DEVICE AND METHOD FOR MANUFACTURING FOUNDRY MOLDS OF GRANULAR MATERIAL. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0497650A1 EP0497650A1 (en) | 1992-08-05 |
| EP0497650B1 true EP0497650B1 (en) | 1994-07-27 |
Family
ID=9409295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92400134A Expired - Lifetime EP0497650B1 (en) | 1991-02-01 | 1992-01-20 | Installation of and method for producing foundry moulds with granulated material |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5219014A (en) |
| EP (1) | EP0497650B1 (en) |
| JP (1) | JP2740702B2 (en) |
| AT (1) | ATE109045T1 (en) |
| DE (1) | DE69200262T2 (en) |
| ES (1) | ES2061318T3 (en) |
| FR (1) | FR2672233B1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102009135A (en) * | 2010-12-01 | 2011-04-13 | 张和啟 | Vacuum negative pressure moulding method for double-axle automobile balance suspension support |
| CN102009136A (en) * | 2010-12-01 | 2011-04-13 | 张和啟 | Method for molding twin-bridge auto balance suspension leaf-spring seat through vacuum negative pressure |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2741520A1 (en) * | 1995-11-27 | 1997-05-30 | Podia France Sarl | Foot imprint device used e.g. to model a foot prosthesis |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2305229C3 (en) * | 1972-02-04 | 1975-04-17 | Sintokogio, Ltd., Nagoya, Aichi (Japan) | Molding box |
| DE2352492B2 (en) * | 1973-10-19 | 1977-08-25 | Wittmoser, Adalbert, Prof Dr-Ing, 6840 Lampertheim | METHOD FOR MANUFACTURING VACUUM-STABILIZED CASTING FORMS |
| DE2516158C3 (en) * | 1975-04-14 | 1978-06-22 | Heinrich Wagner Maschinenfabrik, 5928 Laasphe | Molding box for vacuum-bound casting molds |
| DE3318112A1 (en) * | 1983-05-18 | 1984-11-22 | Achinger, Michael, 8900 Augsburg | METHOD AND DEVICE FOR PRODUCING CASTING MOLDS |
| FR2618358B1 (en) * | 1987-07-22 | 1991-01-18 | Mazeran Jean Jacques | METHOD AND DEVICE FOR MANUFACTURING MOLDS FROM GRANULAR MATERIAL |
-
1991
- 1991-02-01 FR FR9101180A patent/FR2672233B1/en not_active Expired - Fee Related
-
1992
- 1992-01-20 DE DE69200262T patent/DE69200262T2/en not_active Expired - Fee Related
- 1992-01-20 ES ES92400134T patent/ES2061318T3/en not_active Expired - Lifetime
- 1992-01-20 AT AT92400134T patent/ATE109045T1/en not_active IP Right Cessation
- 1992-01-20 EP EP92400134A patent/EP0497650B1/en not_active Expired - Lifetime
- 1992-01-23 US US07/824,075 patent/US5219014A/en not_active Expired - Fee Related
- 1992-01-31 JP JP4016888A patent/JP2740702B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102009135A (en) * | 2010-12-01 | 2011-04-13 | 张和啟 | Vacuum negative pressure moulding method for double-axle automobile balance suspension support |
| CN102009136A (en) * | 2010-12-01 | 2011-04-13 | 张和啟 | Method for molding twin-bridge auto balance suspension leaf-spring seat through vacuum negative pressure |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69200262T2 (en) | 1995-03-09 |
| ATE109045T1 (en) | 1994-08-15 |
| DE69200262D1 (en) | 1994-09-01 |
| EP0497650A1 (en) | 1992-08-05 |
| FR2672233A1 (en) | 1992-08-07 |
| JP2740702B2 (en) | 1998-04-15 |
| JPH04313444A (en) | 1992-11-05 |
| FR2672233B1 (en) | 1993-05-07 |
| ES2061318T3 (en) | 1994-12-01 |
| US5219014A (en) | 1993-06-15 |
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