EP0353119A1 - Pattern plate for realization of moulds destinate for fabrication of glass jointings or similar pieces with foundry sand by presence of a pad within a counter pattern taper - Google Patents

Pattern plate for realization of moulds destinate for fabrication of glass jointings or similar pieces with foundry sand by presence of a pad within a counter pattern taper Download PDF

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Publication number
EP0353119A1
EP0353119A1 EP89401935A EP89401935A EP0353119A1 EP 0353119 A1 EP0353119 A1 EP 0353119A1 EP 89401935 A EP89401935 A EP 89401935A EP 89401935 A EP89401935 A EP 89401935A EP 0353119 A1 EP0353119 A1 EP 0353119A1
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EP
European Patent Office
Prior art keywords
model plate
movable
plate according
bead
sand
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EP89401935A
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German (de)
French (fr)
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EP0353119B1 (en
Inventor
Claude Georges Daumas
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Mancelle de Fonderie SA
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Mancelle de Fonderie SA
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Priority to AT89401935T priority Critical patent/ATE88930T1/en
Publication of EP0353119A1 publication Critical patent/EP0353119A1/en
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Publication of EP0353119B1 publication Critical patent/EP0353119B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/005—Adjustable, sectional, expandable or flexible patterns

Definitions

  • the invention relates to the manufacture by foundry in sand of parts having undercut parts, and more particularly of glass seals or similar parts having a protrusion in the form of an annular bead.
  • the object of the invention is to eliminate the above drawbacks, that is to say to produce a model plate forming in the sand the location for a bead undercut during the compression of the sand, but not having no undercut during extraction of the mold or model, and whose geometry of the shape thus obtained is perfectly controlled and independent of the vagaries of operating conditions.
  • the invention essentially consists in constituting the deformable part in the form of an annular ring pinched between a fixed external part and an axially movable internal part.
  • each model of the plate into three parts, including a fixed external part having the external profile of the part from the joint plane until the birth of the bead, and having a bore slightly larger inside than that of the part, an interior part embedded in the model plate and movable axially over a short stroke defined by mechanical stops between an extended position, towards which it is returned by elastic means, and a retracted position towards which is pushed back by the pressure of the sand during compaction, this movable inner part having internally a blind bore to the inner diameter of the part to be molded and the bottom of which is in said retracted position at the reference plane of the model plate, the external surface of this internal part being adjusted to slide in the internal bore of the external part over at least the height of the latter and ending at the upper part with a rim projecting towards the outside, and finally an elastomer ring mounted on the periphery of this interior part, between said rim and the end of the exterior part, this elastomer ring having a shape at
  • This annular elastomer ring as well as the location which is intended for it, preferably have a section ensuring its retention, for example a dovetail section.
  • model plate 1 which generally comprises several models of which only one is shown.
  • this plate is fixed by usual means and, possibly, embedded, the external part 2, the part projecting above the reference plane 3 of the model plate 1 has an external profile 4 representing the external form of the part to be obtained. from the reference plane 3 to point 5 which corresponds to the birth of the undercut bead.
  • this outer part 2 is delimited by a bore 6 with a diameter slightly greater than the bore of the part to be molded.
  • the movable inner part 7 has a blind inner bore 13 whose diameter is that of the part to be molded, and the bottom 14 of which is, in the retracted position according to FIG. 2, at the exact level of the reference plane 3 of the model plate 1.
  • the surface outer 15 of this inner part 7 is adjusted to slide inside the bore 6 of the fixed outer part 2, at least over the entire height of the latter, and the cylindrical wall 16 of thin thickness thus formed between the bores 6 and 13 ends at its free end with a flange 17 protruding outward without ever exceeding the diameter of the circle 5 representing the limit of the bead.
  • the upper part of the cylindrical surface 15 of the wall 16 defines, with the facing surfaces 18 of the upper edge of the fixed part 2 and 19 of the rim 17 of the moving part 7, the three sides of a section, preferably in dovetail shape, into which an annular elastomer ring 20 is inserted, the outside diameter of which, in the rest position, that is to say therefore in the extended position shown in FIG. 1, does not not exceed or is less than the diameter of the circle 5 defined above, so as to have no undercut.
  • This outer diameter of the ring 20 is even preferably slightly smaller than that of the circle 5, so as to compensate for an always possible persistence of the deformation of the elastomer.
  • the annular ring 20 resumes its shape without undercut of Figures 1 and 3, thanks to its own elasticity aided by the force of the springs 10, which allows this extraction in an easy manner without risk of damage the form of sand obtained, and without requiring the cohesion of this sand to be particularly hard.
  • the sand mold thus formed is then closed and the metal is poured in the usual way to manufacture the parts which have exactly the desired shape with great precision and great regularity of shape.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Hybrid Cells (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Chaque modèle de la plaque (1) comporte : - une pièce extérieure (2) fixée sur la plaque (1); - une pièce intérieure (7) mobile axialement sur une faible course définie par des butées mécaniques entre une position sortie vers laquelle elle est repoussée par des ressorts (10) et une position rentrée qu'elle vient occuper sous l'effet de la pression de compactage, cette pièce intérieure mobile comportant un rebord (17); - enfin une bague annulaire (20) en élastomère dont la section est telle qu'elle vient se loger exactement dans l'espace défini par la surface extérieure cylindrique (15) de la pièce mobile (7) et les faces en regard (18,19) respectivement de l'extrémité de la pièce fixe (2) et du rebord (17) de la pièce mobile (7) lorsque celle-di est dans sa position sortie, sans dépasser extérieurement dans ces conditions ladite naissance (5) du bourrelet.Each model of the plate (1) comprises: - an external part (2) fixed to the plate (1); - an inner part (7) movable axially over a short stroke defined by mechanical stops between an extended position towards which it is pushed back by springs (10) and a retracted position which it comes to occupy under the effect of the pressure of compaction, this movable interior part comprising a flange (17); - finally an annular ring (20) made of elastomer, the cross section of which is such that it is housed exactly in the space defined by the cylindrical outer surface (15) of the moving part (7) and the facing faces (18, 19) respectively from the end of the fixed part (2) and the rim (17) of the movable part (7) when the latter is in its extended position, without externally exceeding these conditions under said conditions (5) of the bead .

Description

L'invention concerne la fabrication par fonderie au sable de pièces présentant des parties en contre-dépouille, et plus particulièrement de joints-glaces ou pièces similaires présentant une excroissance en forme de bourrelet annulaire.The invention relates to the manufacture by foundry in sand of parts having undercut parts, and more particularly of glass seals or similar parts having a protrusion in the form of an annular bead.

Pour résoudre ce problème, on connaît déjà, d'après le document FR-A-2 147 163 au nom de CATERPILLAR, une plaque modèle dont chaque modèle comporte un enrobage en caoutchouc se terminant à la partie supérieure en contre-dépouille par une partie uniquement en caoutchouc pour être suffisamment flexible afin de permettre l'extraction du modèle sans arrachement du sable entourant cette partie flexible. Toutefois, il faut pour que cette extraction soit possible sans arrachement, que le sable soit suffisamment durci pour avoir la cohésion nécessaire afin d'imposer cette flexion au rebord en caoutchouc.To solve this problem, we already know, from document FR-A-2 147 163 in the name of CATERPILLAR, a model plate each model of which includes a rubber coating ending at the upper part undercut by a part only rubber to be flexible enough to allow the extraction of the model without tearing away the sand surrounding this flexible part. However, it is necessary for this extraction to be possible without removal, that the sand is sufficiently hardened to have the necessary cohesion in order to impose this bending on the rubber edge.

Pour éviter cette contrainte, on connaît également, d'après le document DE-A-29 40 171 au nom de GOETZE, une plaque modèle similaire dans laquelle le rebord flexible présente une forme au repos sans contre-dépouille et se trouve évasé par flexion vers l'extérieur sous le seul effet de la pression du sable lors du compactage du moule. Toutefois, cet évasement par flexion présente un caractère quelque peu aléatoire, le déplacement des particules de sable lors du compactage n'étant pas un phénomène parfaitement homogène, de sorte que la forme obtenue n'est pas parfaitement régulière.To avoid this constraint, we also know, from document DE-A-29 40 171 in the name of GOETZE, a similar model plate in which the flexible flange has a shape at rest without undercut and is flared by bending outwards under the sole effect of the sand pressure during compaction of the mold. However, this flaring by bending has a somewhat random character, the displacement of the sand particles during compaction is not a perfectly homogeneous phenomenon, so that the shape obtained is not perfectly regular.

Le but de l'invention est d'éliminer les inconvénients précédents, c'est-à-dire de réaliser une plaque modèle formant dans le sable l'emplacement pour un bourrelet en contre-dépouille lors de la compression du sable, mais ne présentant plus de contre-dépouille lors de l'extraction du moule ou du modèle, et dont la géométrie de la forme ainsi obtenue soit parfaitement maîtrisée et indépendante des aléas des conditions opératoires.The object of the invention is to eliminate the above drawbacks, that is to say to produce a model plate forming in the sand the location for a bead undercut during the compression of the sand, but not having no undercut during extraction of the mold or model, and whose geometry of the shape thus obtained is perfectly controlled and independent of the vagaries of operating conditions.

Pour cela, l'invention consiste essentiellement à constituer la pièce déformable sous la forme d'une bague annulaire pincée entre une pièce extérieure fixe et une pièce intérieure mobile axialement.For this, the invention essentially consists in constituting the deformable part in the form of an annular ring pinched between a fixed external part and an axially movable internal part.

En particulier l'invention prévoit deréaliser chaque modèle de la plaque en trois parties, dont une pièce extérieure fixe présentant le profil extérieur de la pièce depuis le plan de joint jusqu'à la naissance du bourrelet, et présentant intérieurement un alésage légèrement plus grand que celui de la pièce, une pièce intérieure encastrée dans la plaque modèle et mobile axialement sur une faible course définie par des butées mécaniques entre une position sortie, vers laquelle elle est rappelée par des moyens élastiques, et une position rentrée vers laquelle est est repoussée par la pression du sable lors du compactage, cette pièce intérieure mobile comportant intérieurement un alésage borgne au diamètre intérieur de la pièce à mouler et dont le fond se trouve dans ladite position rentrée au niveau du plan de référence de la plaque modèle, la surface extérieure de cette pièce intérieure s'ajustant pour coulisser dans l'alésage intérieur de la pièce extérieure sur au moins la hauteur de cette dernière et se terminant à la partie supérieure par un rebord dépassant vers l'extérieur, et enfin un anneau d'élastomère monté à la périphérie de cette pièce intérieure, entre ledit rebord et l'extrémité de la pièce extérieure, cet anneau en élastomère ayant une forme au repos remplissant entièrement l'espace compris entre ledit rebord et ladite partie supérieure de la pièce extérieure dans ladite position sortie, sans présenter de contre-dépouille sur l'extérieur, de manière à subir dans la position rentrée une déformation par compression axiale et expansion transversale vers l'extérieur afin de constituer ledit emplacement du bourrelet.In particular, the invention provides for making each model of the plate into three parts, including a fixed external part having the external profile of the part from the joint plane until the birth of the bead, and having a bore slightly larger inside than that of the part, an interior part embedded in the model plate and movable axially over a short stroke defined by mechanical stops between an extended position, towards which it is returned by elastic means, and a retracted position towards which is pushed back by the pressure of the sand during compaction, this movable inner part having internally a blind bore to the inner diameter of the part to be molded and the bottom of which is in said retracted position at the reference plane of the model plate, the external surface of this internal part being adjusted to slide in the internal bore of the external part over at least the height of the latter and ending at the upper part with a rim projecting towards the outside, and finally an elastomer ring mounted on the periphery of this interior part, between said rim and the end of the exterior part, this elastomer ring having a shape at rest entirely filling the space between said flange and said upper part of the outer part in said extended position, without presenting an undercut on the outside, so as to undergo in the retracted position a deformation by axial compression and transverse expansion towards the outside in order to constitute said location of the bead.

Cette bague annulaire en élastomère, ainsi que l'emplacement qui lui est destiné, présentent de préférence une section assurant sa retenue, par exemple une section en queue d'aronde.This annular elastomer ring, as well as the location which is intended for it, preferably have a section ensuring its retention, for example a dovetail section.

D'autres particularités de l'invention apparaîtront dans la description qui va suivre d'un mode de réalisation pris comme exemple et représenté sur le dessin annexé, sur lequel :

  • la figure 1 est une coupe de la plaque modèle selon l'axe d'un des modèles, en position sortie;
  • la figure 2 est une coupe correspondante en position rentrée;
  • les figures 3 et 4 représentent des détails à plus grande échelle, respectivement, des figures 1 et 2.
Other features of the invention will appear in the following description of an embodiment taken as an example and shown in the attached drawing, in which:
  • Figure 1 is a section of the model plate along the axis of one of the models, in the extended position;
  • Figure 2 is a corresponding section in retracted position;
  • Figures 3 and 4 show details on a larger scale, respectively, of Figures 1 and 2.

On voit sur les figures la plaque modèle 1 qui comporte en général plusieurs modèles dont un seul est représenté. Sur cette plaque est fixée par des moyens usuels et, éventuellement, encastrée, la pièce extérieure 2 dont la partie dépassant au-dessus du plan de référence 3 de la plaque modèle 1 présente un profil extérieur 4 représentant la forme extérieure de la pièce à obtenir depuis le plan de référence 3 jusqu'au point 5 qui correspond à la naissance du bourrelet en contre-­dépouille. Intérieurement, cette pièce extérieure 2 est délimitée par un alésage 6 d'un diamètre légèrement supérieur à l'alésage de la pièce à mouler.We see in the figures the model plate 1 which generally comprises several models of which only one is shown. On this plate is fixed by usual means and, possibly, embedded, the external part 2, the part projecting above the reference plane 3 of the model plate 1 has an external profile 4 representing the external form of the part to be obtained. from the reference plane 3 to point 5 which corresponds to the birth of the undercut bead. Internally, this outer part 2 is delimited by a bore 6 with a diameter slightly greater than the bore of the part to be molded.

On voit d'autre part la pièce intérieure 7 qui est partiellement encastrée dans la plaque modèle 1 et qui est montée mobile axialement pour une faible course parfaitement définie entre des butées mécaniques. Par exemple, en position sortie, représentée sur la figure 1, ces butées peuvent être constituées par les têtes 8 de vis épaulées 9 qui viennent buter sur la plaque modèle sous l'effet de ressorts 10, par exemple concentriques aux vis 9. Dans la position rentrée représentée sur la figure 2, ce peut être tout simplement le dessous de la pièce 7 qui vient buter dans le fond du logement d'encastrement prévu dans la plaque 1. Eventuellement, un guidage central 11 coulissant dans un palier longitudinal 12, peut améliorer le parallélisme du mouvement.We see on the other hand the inner part 7 which is partially embedded in the model plate 1 and which is mounted axially movable for a short stroke perfectly defined between mechanical stops. For example, in the extended position, represented in FIG. 1, these stops can be constituted by the heads 8 of shoulder screws 9 which abut on the model plate under the effect of springs 10, for example concentric with the screws 9. In the retracted position shown in Figure 2, it can simply be the underside of the part 7 which abuts in the bottom of the recess housing provided in the plate 1. Optionally, a central guide 11 sliding in a longitudinal bearing 12, can improve the parallelism of the movement.

La pièce intérieure mobile 7 comporte un alésage intérieur borgne 13 dont le diamètre est celui de la pièce à mouler, et dont le fond 14 se trouve, en position rentrée selon la figure 2, au niveau exact du plan de référence 3 de la plaque modèle 1. La surface extérieure 15 de cette pièce intérieure 7 est ajustée pour coulisser à l'intérieur de l'alésage 6 de la pièce extérieure fixe 2, au moins sur toute la hauteur de cette dernière, et la paroi cylindrique 16 de faible épaisseur ainsi ménagée entre les alésages 6 et 13 se termine à son extrémité libre par un rebord 17 dépassant vers l'extérieur sans jamais dépasser le diamètre du cercle 5 représentant la limite du bourrelet.The movable inner part 7 has a blind inner bore 13 whose diameter is that of the part to be molded, and the bottom 14 of which is, in the retracted position according to FIG. 2, at the exact level of the reference plane 3 of the model plate 1. The surface outer 15 of this inner part 7 is adjusted to slide inside the bore 6 of the fixed outer part 2, at least over the entire height of the latter, and the cylindrical wall 16 of thin thickness thus formed between the bores 6 and 13 ends at its free end with a flange 17 protruding outward without ever exceeding the diameter of the circle 5 representing the limit of the bead.

La partie supérieure de la surface cylindrique 15 de la paroi 16 définit, avec les surfaces en regard 18 du bord supérieur de la pièce fixe 2 et 19 du rebord 17 de la pièce mobile 7, les trois côtés d'une section, de préférence en forme de queue d'aronde, dans laquelle vient s'insérer exactement une bague annulaire 20 en élastomère dont le diamètre extérieur, en position de repos, c'est-à-dire par conséquent dans la position sortie représentée sur la figure 1, ne dépasse pas ou est inférieur au diamètre du cercle 5 défini précédemment, de manière à ne présenter aucune contre-dépouille. Ce diamètre extérieur de la bague 20 est même de préférence légèrement inférieur à celui du cercle 5, de manière à pallier une rémanence toujours possible de la déformation de l'élastomère.The upper part of the cylindrical surface 15 of the wall 16 defines, with the facing surfaces 18 of the upper edge of the fixed part 2 and 19 of the rim 17 of the moving part 7, the three sides of a section, preferably in dovetail shape, into which an annular elastomer ring 20 is inserted, the outside diameter of which, in the rest position, that is to say therefore in the extended position shown in FIG. 1, does not not exceed or is less than the diameter of the circle 5 defined above, so as to have no undercut. This outer diameter of the ring 20 is even preferably slightly smaller than that of the circle 5, so as to compensate for an always possible persistence of the deformation of the elastomer.

Lorsque l'on utilise une telle plaque modèle dans le procédé habituel de moulage au sable, la pression de compactage du sable, quels que soient la valeur de cette pression, dès lors qu'elle dépasse une valeur minimale et son degré d'homogénéité, a pour effet, en agissant sur la large surface offerte par la pièce 7, de déplacer celle-ci à l'encontre des ressorts 10 vers sa position rentrée de la figure 2, ce qui a pour conséquence de comprimer axialement la pièce annulaire 20 d'une quantité parfaitement définie, et comme cette pièce annulaire 20 est déjà contenue de manière précise sur trois des côtés de sa section dans des pièces mécaniques précises, elle ne peut se déformer que par expansion vers l'extérieur d'une quantité bien définie et selon une géométrie précise, comme illustré sur la figure 4. Naturellement, lors de la décompression présidant à l'extraction du moule ou de la plaque modèle, la bague annulaire 20 reprend sa forme sans contre-dépouille des figures 1 et 3, grâce à son élasticité propre aidée par la force des ressorts 10, ce qui permet cette extraction d'une manière aisée sans risque d'endommager la forme en sable obtenue, et sans exiger de la cohésion de ce sable une dureté particulière.When such a model plate is used in the usual process of sand molding, the pressure of compacting the sand, whatever the value of this pressure, as soon as it exceeds a minimum value and its degree of homogeneity, has the effect, by acting on the large surface offered by the part 7, to move the latter against the springs 10 towards its retracted position of FIG. 2, which has the consequence of axially compressing the annular part 20 d 'a perfectly defined quantity, and since this annular part 20 is already precisely contained on three of the sides of its section in precise mechanical parts, it can only be deformed by expansion towards the outside by a well-defined quantity and according to a precise geometry, as illustrated in FIG. 4. Naturally, during decompression presiding over the extraction of the mold or of the model plate, the annular ring 20 resumes its shape without undercut of Figures 1 and 3, thanks to its own elasticity aided by the force of the springs 10, which allows this extraction in an easy manner without risk of damage the form of sand obtained, and without requiring the cohesion of this sand to be particularly hard.

Naturellement, le moule en sable ainsi constitué est ensuite refermé et on procéde à la coulée du métal de la manière habituelle pour fabriquer les pièces qui ont exactement la forme voulue avec une grande précision et une grande régularité de forme.Naturally, the sand mold thus formed is then closed and the metal is poured in the usual way to manufacture the parts which have exactly the desired shape with great precision and great regularity of shape.

Claims (10)

1. Plaque modèle pour la réalisation de moule destiné à la fabrication par fonderie au sable de joints-glaces ou pièces similaires présentant un bourrelet en contre-dépouille, grâce à l'utilisation, pour constituer l'emplacement de ce bourrelet, d'une pièce en élastomère sans contre-dépouille déformée vers l'extérieur par utilisation de la pression de compactage du sable, caractérisée par le fait que la pièce en élastomère est une bague annulaire (20) pincée entre une pièce extérieure fixe (2) et une pièce intérieure (7) mobile axialement.1. Model plate for the production of a mold intended for the manufacture by foundry with sand of glass seals or similar parts having a bead undercut, thanks to the use, to constitute the location of this bead, of a elastomer part without undercut deformed towards the outside by using the compaction pressure of the sand, characterized in that the elastomer part is an annular ring (20) pinched between a fixed external part (2) and a part inner (7) axially movable. 2. Plaque modèle selon la revendication 1, caractérisée par le fait que la pièce extérieure (2) est fixée sur la plaque (1) et présente un profil extérieur (4) dont la forme, depuis le plan de référence (3) de la plaque modèle jusqu'à la naissance (5) du bourrelet, correspond au profil extérieur de la pièce à mouler, et dont la surface intérieure (6) est constituée par un alésage légèrement supérieur à celui de la pièce à mouler.2. Model plate according to claim 1, characterized in that the external part (2) is fixed to the plate (1) and has an external profile (4) whose shape, from the reference plane (3) of the model plate until the birth (5) of the bead, corresponds to the external profile of the part to be molded, and the internal surface (6) of which is constituted by a bore slightly greater than that of the part to be molded. 3. Plaque modèle selon la revendication 2, caractérisée par le fait que la pièce intérieure (7) mobile axialement sur une faible course définie par des butées mécaniques entre une position sortie vers laquelle elle est repoussée par des ressorts (10) et une position rentrée qu'elle vient occuper sous l'effet de ladite pression de compactage, la surface extérieure (15) de cette pièce intérieure (7) étant adaptée pour coulisser exactement dans l'alésage (6) de la pièce extérieure fixe (2), au moins sur la hauteur de celle-ci, cette pièce mobile (7) se terminant à son extrémité extérieure par un rebord (17) ne dépassant pas en diamètre ladite naissance (5) du bourrelet.3. Model plate according to claim 2, characterized in that the inner part (7) movable axially over a short stroke defined by mechanical stops between an extended position towards which it is pushed back by springs (10) and a retracted position that it comes to occupy under the effect of said compaction pressure, the external surface (15) of this internal part (7) being adapted to slide exactly in the bore (6) of the fixed external part (2), at less on the height thereof, this movable part (7) ending at its outer end by a flange (17) not exceeding in diameter, said birth (5) of the bead. 4. Plaque modèle selon la revendication 3, caractérisée par le fait que la bague annulaire (20) en élastomère a une section telle qu'elle vient se loger exactement dans l'espace défini par la surface extérieure cylindrique (15) de la pièce mobile (7) et les faces en regard (18,19) respectivement de l'extrémité de la pièce fixe (2) et du rebord (17) de la pièce mobile (7) lorsque celle-ci est dans sa position sortie, sans dépasser extérieurement dans ces conditions ladite naissance (5) du bourrelet.4. Model plate according to claim 3, characterized in that the annular elastomer ring (20) has a section such that it is housed exactly in the space defined by the cylindrical outer surface (15) of the moving part (7) and the facing faces (18,19) respectively of the end of the fixed part (2) and the flange (17) of the movable part (7) when the latter is in its extended position, without exceeding externally under these conditions said birth (5) of the bead. 5. Plaque modèle selon une des revendications 3 et 4, caractérisée par le fait que la pièce intérieure mobile (7) comporte un alésage intérieur borgne (13) au diamètre intérieur de la pièce à mouler et dont le fond, dans ladite position rentrée, se trouve exactement au niveau de la surface de référence (3) de la plaque modèle, de telle manière que la pression de compactage du sable, lors de l'utilisation de cette plaque modèle pour constituer le moule en sable, en agissant sur toute la surface de la pièce mobile (7) ait pour effet d'amener chaque pièce mobile (7) en position rentrée, à l'encontre des ressorts (10) et de comprimer la section de la bague annulaire (20) contenue sur trois côtés, de manière à produire son expansion vers l'extérieur, d'une quantité parfaitement défine, et produire ainsi l'emplacement dudit bourrelet, tout en reprenant sa forme initiale sans dépouille dès le début de l'extraction.5. Model plate according to one of claims 3 and 4, characterized in that the movable inner part (7) has a blind inner bore (13) with the inner diameter of the part to be molded and the bottom of which, in said retracted position, is exactly at the level of the reference surface (3) of the model plate, in such a way that the compaction pressure of the sand, when using this model plate to constitute the mold in sand, acting on the whole surface of the movable part (7) has the effect of bringing each movable part (7) in the retracted position, against the springs (10) and of compressing the section of the annular ring (20) contained on three sides, so as to produce its expansion towards the outside, by a perfectly defined amount, and thus produce the location of said bead, while resuming its initial shape without draft from the start of the extraction. 6. Plaque modèle selon une des revendications précédentes, caractérisée par le fait que la section de la bague annulaire en élastomère (20) ainsi que de l'emplacement qui lui est réservé entre les pièces fixe (2) et mobile (7), est en forme de queue d'aronde.6. Model plate according to one of the preceding claims, characterized in that the section of the annular elastomer ring (20) and of the space reserved for it between the fixed (2) and movable (7) parts, is in the shape of a dovetail. 7. Plaque modèle selon une des revendications 3 à 6, caractérisée par le fait que la butée mécanique axiale définissant la position sortie est assurée par les têtes (8) de vis épaulées (9).7. Model plate according to one of claims 3 to 6, characterized in that the axial mechanical stop defining the extended position is provided by the heads (8) of shouldered screws (9). 8. Plaque modèle selon la revendication 7, caractérisée par le fait que lesdits ressorts de rappel (10) sont des ressorts hélicoïdaux de compression disposés coaxialement autour d'au moins certaines desdites vis épaulées (9).8. Model plate according to claim 7, characterized in that said return springs (10) are helical compression springs arranged coaxially around at least some of said shouldered screws (9). 9. Plaque modèle selon une des revendications 3 à 8, caractérisée par le fait que la butée mécanique de la pièce mobile (7) définissant sa position rentrée est assurée par la butée du dessous de la pièce mobile (7) sur le fond du logement d'encastrement de cette pièce dans la plaque modèle (1).9. Model plate according to one of claims 3 to 8, characterized in that the mechanical stop of the moving part (7) defining its retracted position is ensured by the stop from below the moving part (7) on the bottom of the housing this piece in the model plate (1). 10. Plaque modèle selon une des revendications précédentes, caractérisée par le fait que la pièce mobile (7) comporte en outre un guidage central (11) coulissant axialement dans un palier longitudinal (12) de la plaque modèle (1).10. Model plate according to one of the preceding claims, characterized in that the movable part (7) further comprises a central guide (11) sliding axially in a longitudinal bearing (12) of the model plate (1).
EP89401935A 1988-07-07 1989-07-06 Pattern plate for realization of moulds destinate for fabrication of glass jointings or similar pieces with foundry sand by presence of a pad within a counter pattern taper Expired - Lifetime EP0353119B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89401935T ATE88930T1 (en) 1988-07-07 1989-07-06 MODEL PLATE FOR THE DESIGN OF MOLDS, INTENDED FOR THE MANUFACTURE OF GLASS GASKETS BY MEANS OF FOUNDRY SAND WHERE THE PRESENCE OF A BEAD IN THE COUNTERFORM SLOPE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8809257 1988-07-07
FR8809257A FR2633851B1 (en) 1988-07-07 1988-07-07 MODEL PLATE FOR THE PRODUCTION OF MOLDS FOR THE MANUFACTURE BY SAND FOUNDRY OF ICE JOINTS OR SIMILAR PARTS HAVING A BUCKLE

Publications (2)

Publication Number Publication Date
EP0353119A1 true EP0353119A1 (en) 1990-01-31
EP0353119B1 EP0353119B1 (en) 1993-05-05

Family

ID=9368211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89401935A Expired - Lifetime EP0353119B1 (en) 1988-07-07 1989-07-06 Pattern plate for realization of moulds destinate for fabrication of glass jointings or similar pieces with foundry sand by presence of a pad within a counter pattern taper

Country Status (6)

Country Link
US (1) US4952282A (en)
EP (1) EP0353119B1 (en)
AT (1) ATE88930T1 (en)
DE (1) DE68906323T2 (en)
ES (1) ES2040482T3 (en)
FR (1) FR2633851B1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2183667B1 (en) * 1999-11-19 2004-05-16 Loramendi, S.A. MOTOR MOLDING MACHINE, PERFECTED.
US8373368B2 (en) * 2009-02-09 2013-02-12 Ioan Achiriloaie Energy storage device
CN104985115B (en) * 2015-06-30 2017-12-26 重庆市合川区云天机械制造有限公司 Make the collapsible mold of fuel feed pump plunger sand mo(u)ld
CN106694813A (en) * 2015-11-13 2017-05-24 成都兴宇精密铸造有限公司 Casting assembly mold

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2020157A1 (en) * 1969-04-25 1970-10-29 Caterpillar Tractor Co Composite model and process for making precision sand casting molds
FR2147163A1 (en) * 1971-07-26 1973-03-09 Caterpillar Tractor Co
DE2940171C2 (en) * 1979-10-04 1984-04-05 Goetze Ag, 5093 Burscheid Model for making casting molds
DE3602049A1 (en) * 1986-01-24 1987-07-30 Goetze Ag Pattern for the manufacture of casting moulds

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624758A (en) * 1968-07-12 1971-11-30 Caterpillar Tractor Co Method of making a sand mold with a back draft
US3773100A (en) * 1969-12-01 1973-11-20 Hooker Chemical Corp Molding box comprising pattern frame having internal lining strips
AU544242B2 (en) * 1980-10-20 1985-05-23 Deere & Company Inserting cores

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2020157A1 (en) * 1969-04-25 1970-10-29 Caterpillar Tractor Co Composite model and process for making precision sand casting molds
FR2147163A1 (en) * 1971-07-26 1973-03-09 Caterpillar Tractor Co
DE2940171C2 (en) * 1979-10-04 1984-04-05 Goetze Ag, 5093 Burscheid Model for making casting molds
DE3602049A1 (en) * 1986-01-24 1987-07-30 Goetze Ag Pattern for the manufacture of casting moulds

Also Published As

Publication number Publication date
DE68906323D1 (en) 1993-06-09
US4952282A (en) 1990-08-28
DE68906323T2 (en) 1993-08-19
FR2633851B1 (en) 1991-05-17
EP0353119B1 (en) 1993-05-05
FR2633851A1 (en) 1990-01-12
ATE88930T1 (en) 1993-05-15
ES2040482T3 (en) 1993-10-16

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