EP0317412B1 - Composed die set for drawing press - Google Patents

Composed die set for drawing press Download PDF

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Publication number
EP0317412B1
EP0317412B1 EP19880402846 EP88402846A EP0317412B1 EP 0317412 B1 EP0317412 B1 EP 0317412B1 EP 19880402846 EP19880402846 EP 19880402846 EP 88402846 A EP88402846 A EP 88402846A EP 0317412 B1 EP0317412 B1 EP 0317412B1
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EP
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Prior art keywords
tank
metal
working
press
die
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EP19880402846
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German (de)
French (fr)
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EP0317412A1 (en
Inventor
Gilbert Gorin
Gérard Monza
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CHAUSSON INGENIERIE
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CHAUSSON INGENIERIE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/20—Making tools by operations not covered by a single other subclass

Definitions

  • a stamping press includes a set of tools, the simplest of which consists of a die, a blank holder and a punch.
  • the blank holder serves to keep the peripheral edge of the blank pressed against the peripheral edge of the die when the press is closed, then the punch is then moved relative to the die to deform the blank and give it the required shape by cooperating for that with the matrix.
  • the parts of the stamping tool set also include numerous accessories such as ejectors, bezers, vents, etc. removably mounted.
  • a reference model is used for each part, which is established from a standard model.
  • the reference model is used for the execution of a reproducing model which is used for the machining by copying of a raw piece of foundry produced by casting in a sand mold.
  • Machining includes several roughing passes, generally three, followed by at least one finishing pass.
  • the set of tools for the production of stamped parts constitutes a very high weight unit given the dimensions which certain parts have such as mud flaps, doors, vehicle roofs, etc.
  • the tools must be rectified by a highly competent specialist because it always turns out that there are defects due to machining on large parts which are not centered. identically in the same way on the machining bench and on the press.
  • the present invention creates a new set of composite tools which makes it possible to considerably reduce the manufacturing time and which greatly improves the precision of all the constituent parts of the set of tools while reducing or even eliminating any machining of the working parts of the set of tools.
  • Document FR-A-2 221 201 discloses a set of composite tools for a stamping press comprising plates to cause the relative displacement of a punch relative to a die as well as a blank holder holding a blank against the edge of the die during the relative movement of the punch and the die, the die comprising a working part of metal which cooperates with a working part of the punch also in metal and with a working part of the blank holder also in metal, l at least one of the working parts being supported by a body connected to a sole carried by the press, the matrix and the blank holder being fixed respectively to the lower sole and to the upper sole of the press.
  • the set of tools is characterized in that the body is made of concrete constituted by a synthetic resin loaded with mineral matter and is contained in a metal tank or box connected to one of the soles of the press, the composite matrix and the composite blank holder being fixed respectively to the lower sole and to the upper sole of the press by cleats rigidly connected to the tank or box, itself anchored to the concrete by sealing lugs, the working parts metal of the matrix and the blank holder being rigid parts supported by shims interposed between said metal working parts and concrete and by tubular spacers containing screws connecting the metal working parts to their respective flange.
  • the invention also extends to a method for the production of a set of composite tools and, in this regard, document FR-A-2 221 201 above shows a process for the manufacture of a tool element, die, punch or blank holder a set of composite tools for a piece stamping press, in which a tank or box is placed on and around a metal working part, concrete is poured into the tank or box and on the working part , said concrete constituting the body of the tool and said working part and said body of the tool are assembled to said tank or box.
  • the method is characterized in that a concrete consisting of a synthetic resin loaded with mineral material is used, the working part is placed on a model or model or directly on a corresponding working part of the set of tools, said metal working part being a rigid part, before pouring the concrete, place shims on and around the free surfaces of the working part, a layer of covering resin is poured, l assembly of the body of the tool and the working part to the tank or box being produced by means of screws passed through tabs of said tank or box and in tubular spacers, said screws respectively connecting the body of the tool and the working parts at the soles of the press.
  • Fig. 1 is a schematic sectional elevation of a set of composite tools according to the invention, for a stamping press.
  • Fig. 2 is a schematic sectional elevation illustrating an embodiment of part of the set of tools of FIG. 1.
  • Fig. 3 is a sectional elevation similar to FIG. 2, illustrating the production of another part of the set of tools in FIG. 1.
  • Fig. 4 is a diagram illustrating a particular phase of production of working tool parts.
  • the sole 1 is connected to a matrix designated as a whole by 5. Furthermore, the sole 3 is connected to a blank holder 6 and is crossed by actuating members 7 of a punch designated as a whole by the reference 8, said actuating members 7 being connected to a slide of the press.
  • the blank holder 6 is intended to hold a part 9 on the periphery of the working part of the die 5 when the punch 8 is moved by the actuating members 7 to put shaped said part 9 by pressing it against the die 5.
  • the matrix comprises a tank 10 made of sheet metal, the internal walls of which include sealing tabs 11 to ensure perfect connection between said tank 10 and a concrete 12 constituting the body of the matrix.
  • the concrete 12 is, for example, constituted by a synthetic resin loaded with mineral matter.
  • irons 13 can be placed in the tank 10.
  • passages 14 are cleaned in the body 12 by means of tubes or other suitable elements, said passages 14 being intended for example to contain the body of ejector cylinders of the part 9.
  • the interior of the tank 10 can also be partitioned to reinforce some of its parts.
  • the concrete body 12 also contains spacers 15, for example tubular, which are interposed between the sole 1 and the working part 16 of the matrix.
  • the tank 10 is, moreover, provided in its lateral walls, with tubes 17 allowing the engagement of handling fingers and tabs 18 for fixing the matrix to the sole 1 by means of screws 19 or other suitable members.
  • FIG. 2 shows a model 20 of a shape complementary to that of the working part 16 of the matrix.
  • the model 20 is surrounded at its periphery by a formwork 21, for example made of wood.
  • the formwork 21 is provided, on its top, with covering elements 22, for example made of synthetic resin foam, and, likewise, covering elements 23 are arranged at the periphery of the working part 16.
  • the tank 10 is placed on the covering elements 22 as well as the spacer tubes 15, the passage pipes 14 and other accessories which the matrix must include, for example concrete irons 13.
  • the concrete 12 which must form the body is then poured up near the upper part 10 of the tank.
  • Liquid resin intended to form a covering layer 24, called gelcoat is finally cast, then the sole 1 is put in place and tightened on the tank 10 by means of the screws 19 and possibly of the screws 19a which can be passed through the tubes. - spacers 15 to be screwed into some of the working parts 16.
  • the cover layer 24 is placed in liquid form and in excess, vents 25 being provided to remove the excess resin. It is thus ensured that the sole 1 is in close contact with the concrete body 12 and that the latter is itself in close contact with the working part 16 of the matrix.
  • the prepared part is then turned over, the covering elements 22 and 23 being removed.
  • the space left free by the covering elements 23 is finally filled with liquid resin which is polymerized to ensure a perfect connection between the working part 16 and the body 12 of concrete.
  • the punch 8 is manufactured in a similar manner to what has just been described, that is to say that its working part 26 is placed on a model or model 27 and is then connected to a box 28 provided with cleats 18a for the passage of screws such as 29, connecting it to the working part 26.
  • the box 28 is filled with a concrete body 12a.
  • the box 28 is used, like the tank 10 of the matrix, for fixing various accessories, in particular guide plates 30 which are intended to cooperate with guide plates 31 of the blank holder.
  • the punch 8 When the punch 8 is completed as described above, it is put in place in the die 5 after dressing thereof by a reference piece 9 or by providing it with brass shims of thickness corresponding to the piece 9.
  • the working edges 34 can indifferently be put in place after or before the tank 33.
  • spacers 35 are preferably tubular between the part working and the level corresponding to the upper part of the tank 33.
  • a removable sheath 36 is placed on top of the punch to which the guide plate (s) 31 are also attached, which must cooperate with the guide plate (s) 30 of the punch.
  • concrete forming a body 12b is poured into the tank 33 near the upper part thereof, liquid resin is then poured and then the sole 3 is it -same establishment and pressed on the liquid resin and on the concrete body 12b by screws 19a and possibly other screws passed through the tubular spacers 35.
  • the pressing of the sole 3 is preferably carried out while the latter went up on the press.
  • the sheath 36 can be removed if desired.
  • the embodiment described above means that the parts which are produced from one another provide automatic adjustment with respect to the press which carries them, which then avoids any resumption of machining.
  • each tool part can be made in one or more pieces. It is also possible that some parts have recesses as shown in 37 and 38 with respect to the punch and the die respectively.
  • Some of the working parts can also be reinforced by blades made of particularly hard metals when some of said working parts have to withstand particular wear or pressure stresses.
  • the model 41 is covered by a deformable thermoplastic sheet 42, for example made of polyethylene, which is formed under vacuum to exactly match the model 41.
  • a layer of a refractory material 43 for example zirconium, is then sprayed onto the sheet 42, then the assembly is put in place in a box 44 into which mold sand is vibrated and to which a vacuum is applied pushed by pipes such as 45.
  • Cast iron or another metal suitable for making the parts working of the above tools is then poured through one or more conduits 46, which destroys the model and produces the desired part of the tool at the exact dimensions of said model.
  • the model does not have an undercut, it is removed beforehand.

Description

Une presse à emboutir comporte un jeu d'outils dont le plus simple est constitué par une matrice, un serre-flan et un poinçon. Le serre-flan sert à maintenir pressé le bord périphérique du flan contre le bord périphérique de la matrice lors de la fermeture de la presse puis le poinçon est ensuite déplacé par rapport à la matrice pour déformer le flan et lui donner la forme requise en coopérant pour cela avec la matrice.A stamping press includes a set of tools, the simplest of which consists of a die, a blank holder and a punch. The blank holder serves to keep the peripheral edge of the blank pressed against the peripheral edge of the die when the press is closed, then the punch is then moved relative to the die to deform the blank and give it the required shape by cooperating for that with the matrix.

Les parties du jeu d'outils d'emboutissage comportent, en outre, de nombreux accessoires tels que des éjecteurs, des drageoirs, des évents, etc. montés de façon amovible.The parts of the stamping tool set also include numerous accessories such as ejectors, bezers, vents, etc. removably mounted.

Pour réaliser le jeu d'outils on utilise pour chaque partie une maquette de référence qui est établie à partir d'un modèle étalon. La maquette de référence sert à l'exécution d'un modèle reproducteur qui est utilisé pour l'usinage par copiage d'une pièce brute de fonderie réalisée par coulée dans un moule en sable.To make the set of tools, a reference model is used for each part, which is established from a standard model. The reference model is used for the execution of a reproducing model which is used for the machining by copying of a raw piece of foundry produced by casting in a sand mold.

L'usinage comporte plusieurs passes de dégrossissage, en général trois, suivies au moins d'une passe de finition.Machining includes several roughing passes, generally three, followed by at least one finishing pass.

Le jeu d'outils pour la réalisation de pièces embouties constitue un ensemble de poids très élevé compte tenu de dimensions que présentent certaines pièces telles que des garde-boue, des portes, des pavillons de véhicule, etc. De plus, au moment de leur première mise sous presse, les outils doivent être rectifiés par un spécialiste hautement compétent car il s'avère toujours qu'il existe des défauts dus à l'usinage sur des pièces de grande étendue qui ne sont pas centrées identiquement de même manière sur le banc d'usinage et sur la presse.The set of tools for the production of stamped parts constitutes a very high weight unit given the dimensions which certain parts have such as mud flaps, doors, vehicle roofs, etc. In addition, at the time of their first press, the tools must be rectified by a highly competent specialist because it always turns out that there are defects due to machining on large parts which are not centered. identically in the same way on the machining bench and on the press.

La présente invention crée un nouveau jeu d'outils composites qui permet de réduire considérablement le temps de fabrication et qui améliore beaucoup la précision de l'ensemble des parties constitutives du jeu d'outils tout en réduisant voire en éliminant tout usinage des parties travaillantes du jeu d'outils.The present invention creates a new set of composite tools which makes it possible to considerably reduce the manufacturing time and which greatly improves the precision of all the constituent parts of the set of tools while reducing or even eliminating any machining of the working parts of the set of tools.

On connaît par le document FR-A-2 221 201 un jeu d'outils composites pour presse d'emboutissage comportant des plateaux pour provoquer le déplacement relatif d'un poinçon par rapport à une matrice ainsi qu'un serre-flan maintenant un flan contre le bord de la matrice pendant le déplacement relatif du poinçon et de la matrice, la matrice comportant une partie travaillante en métal qui coopère avec une partie travaillante du poinçon également en métal et avec une partie travaillante du serre-flan également en métal, l'une au moins des parties travaillantes étant supportée par un corps relié à une semelle portée par la presse, la matrice et le serre-flan étant fixés respectivement à la semelle inférieure et à la semelle supérieure de la presse.Document FR-A-2 221 201 discloses a set of composite tools for a stamping press comprising plates to cause the relative displacement of a punch relative to a die as well as a blank holder holding a blank against the edge of the die during the relative movement of the punch and the die, the die comprising a working part of metal which cooperates with a working part of the punch also in metal and with a working part of the blank holder also in metal, l at least one of the working parts being supported by a body connected to a sole carried by the press, the matrix and the blank holder being fixed respectively to the lower sole and to the upper sole of the press.

Conformément à l'invention, le jeu d'outils est caractérisé en ce que le corps est en béton constitué par une résine synthétique chargée de matière minérale et est contenu dans une cuve ou caisse métallique reliée à l'une des semelles de la presse, la matrice composite et le serre-flan composite étant fixés respectivement à la semelle inférieure et à la semelle supérieure de la presse par des taquets rigidement reliés à la cuve ou caisse, elle-même ancrée au béton par des pattes de scellement, les parties travaillantes en métal de la matrice et du serre-flan étant des parties rigides supportées par des cales d'épaisseur interposées entre lesdites parties travaillantes en métal et le béton et par des entretoises tubulaires contenant des vis reliant les parties travaillantes en métal à leur semelle respective.According to the invention, the set of tools is characterized in that the body is made of concrete constituted by a synthetic resin loaded with mineral matter and is contained in a metal tank or box connected to one of the soles of the press, the composite matrix and the composite blank holder being fixed respectively to the lower sole and to the upper sole of the press by cleats rigidly connected to the tank or box, itself anchored to the concrete by sealing lugs, the working parts metal of the matrix and the blank holder being rigid parts supported by shims interposed between said metal working parts and concrete and by tubular spacers containing screws connecting the metal working parts to their respective flange.

L'invention s'étend également à un procédé pour la réalisation d'un jeu d'outils composites et, à ce sujet, le document FR-A-2 221 201 ci-dessus montre un procédé pour la fabrication d'un élément d'outil, matrice, poinçon ou serre-flan d'un jeu d'outils composites pour presse à emboutir une pièce, dans lequel on met en place sur et autour d'une partie travaillante en métal une cuve ou caisse, on coule un béton dans la cuve ou caisse et sur la partie travaillante, ledit béton constituant le corps de l'outil et on assemble ladite partie travaillante et ledit corps de l'outil à ladite cuve ou caisse.The invention also extends to a method for the production of a set of composite tools and, in this regard, document FR-A-2 221 201 above shows a process for the manufacture of a tool element, die, punch or blank holder a set of composite tools for a piece stamping press, in which a tank or box is placed on and around a metal working part, concrete is poured into the tank or box and on the working part , said concrete constituting the body of the tool and said working part and said body of the tool are assembled to said tank or box.

Conformément à cette seconde disposition de l'invention, le procédé est caractérisé en ce qu'on utilise un béton constitué par une résine synthétique chargée de matière minérale, on dispose la partie travaillante sur une maquette ou modèle ou directement sur une partie travaillante correspondante du jeu d'outils, ladite partie travaillante en métal étant une partie rigide, avant de couler le béton on met en place des cales d'épaisseur sur et autour des surfaces libres de la partie travaillante, on coule une couche de résine de couverture, l'assemblage du corps de l'outil et de la partie travaillante à la cuve ou caisse étant réalisé au moyen de vis passées dans des taquets de ladite cuve ou caisse et dans des entretoises tubulaires, lesdites vis reliant respectivement le corps de l'outil et les parties travaillantes aux semelles de la presse.In accordance with this second arrangement of the invention, the method is characterized in that a concrete consisting of a synthetic resin loaded with mineral material is used, the working part is placed on a model or model or directly on a corresponding working part of the set of tools, said metal working part being a rigid part, before pouring the concrete, place shims on and around the free surfaces of the working part, a layer of covering resin is poured, l assembly of the body of the tool and the working part to the tank or box being produced by means of screws passed through tabs of said tank or box and in tubular spacers, said screws respectively connecting the body of the tool and the working parts at the soles of the press.

Diverses autres caractéristiques de l'invention ressortent d'ailleurs de la description détaillée qui suit et des revendications 2 et 3 et 5 à 10 annexées.Various other characteristics of the invention will moreover emerge from the detailed description which follows and from claims 2 and 3 and 5 to 10 appended.

Une forme de réalisation de l'objet de l'invention est représentée, à titre d'exemple non limitatif, au dessin annexé.An embodiment of the object of the invention is shown, by way of nonlimiting example, in the accompanying drawing.

La fig. 1 est une coupe-élévation schématique d'un jeu d'outils composites suivant l'invention, pour presse d'emboutissage.Fig. 1 is a schematic sectional elevation of a set of composite tools according to the invention, for a stamping press.

La fig. 2 est une coupe-élévation schématique illustrant un mode de réalisation d'une partie du jeu d'outils de la fig. 1.Fig. 2 is a schematic sectional elevation illustrating an embodiment of part of the set of tools of FIG. 1.

La fig. 3 est une coupe-élévation analogue à la fig. 2, illustrant la réalisation d'une autre partie du jeu d'outils de la fig. 1.Fig. 3 is a sectional elevation similar to FIG. 2, illustrating the production of another part of the set of tools in FIG. 1.

La fig. 4 est un schéma illustrant une phase particulière de réalisation de parties travaillantes d'outil.Fig. 4 is a diagram illustrating a particular phase of production of working tool parts.

Au dessin, on a représenté en 1 la semelle inférieure d'un outil d'emboutissage destiné à être monté sur le plateau inférieur 2 d'une presse à emboutir. De même manière, on a représenté en 3 la semelle supérieure de l'outil qui est destiné à être reliée au plateau supérieur 4 de la presse.In the drawing, there is shown at 1 the lower sole of a stamping tool intended to be mounted on the lower plate 2 of a stamping press. Similarly, there is shown at 3 the upper sole of the tool which is intended to be connected to the upper plate 4 of the press.

La semelle 1 est reliée à une matrice désignée dans son ensemble par 5. Par ailleurs, la semelle 3 est reliée à un serre-flan 6 et est traversée par des organes d'actionnement 7 d'un poinçon désigné dans son ensemble par la référence 8, lesdits organes d'actionnement 7 étant reliés à un coulisseau de la presse.The sole 1 is connected to a matrix designated as a whole by 5. Furthermore, the sole 3 is connected to a blank holder 6 and is crossed by actuating members 7 of a punch designated as a whole by the reference 8, said actuating members 7 being connected to a slide of the press.

De manière connue dans la technique, le serre-flan 6 est destiné à maintenir une pièce 9 sur la périphérie de la partie travaillante de la matrice 5 lorsque le poinçon 8 est déplacé par les organes d'actionnement 7 pour mettre en forme ladite pièce 9 en la pressant contre la matrice 5.As is known in the art, the blank holder 6 is intended to hold a part 9 on the periphery of the working part of the die 5 when the punch 8 is moved by the actuating members 7 to put shaped said part 9 by pressing it against the die 5.

De même, des éjecteurs que comporte normalement la matrice 5 pour l'extraction de la pièce 9 n'ont pas été illustrés, ces éjecteurs pouvant être réalisés d'une manière quelconque connue dans la technique.Likewise, ejectors normally included in the die 5 for extracting the part 9 have not been illustrated, these ejectors being able to be produced in any manner known in the art.

Pour ne pas compliquer le dessin, les organes d'actionnement du serre-flan 6 n'ont pas été représentés, ces organes étant normalement disposés entre la semelle 3 et le plateau 4 et étant bien connus dans la technique.In order not to complicate the drawing, the actuating members of the blank holder 6 have not been shown, these members being normally arranged between the sole 3 and the plate 4 and being well known in the art.

Comme l'illustre le dessin, la matrice comporte une cuve 10 en tôle dont les parois internes comportent des pattes de scellement 11 pour assurer une liaison parfaite entre ladite cuve 10 et un béton 12 constituant le corps de la matrice. Le béton 12 est, par exemple, constitué par une résine synthétique chargée de matière minérale. Pour renforcer le corps en béton 12, des fers 13 peuvent être disposés dans la cuve 10. En outre, on ménage des passages 14 dans le corps 12 au moyen de tubes ou autres éléments appropriés, lesdits passages 14 étant destinés par exemple à contenir le corps de vérins éjecteurs de la piéce 9.As illustrated in the drawing, the matrix comprises a tank 10 made of sheet metal, the internal walls of which include sealing tabs 11 to ensure perfect connection between said tank 10 and a concrete 12 constituting the body of the matrix. The concrete 12 is, for example, constituted by a synthetic resin loaded with mineral matter. To reinforce the concrete body 12, irons 13 can be placed in the tank 10. In addition, passages 14 are cleaned in the body 12 by means of tubes or other suitable elements, said passages 14 being intended for example to contain the body of ejector cylinders of the part 9.

L'intérieur de la cuve 10 peut aussi être cloisonné pour renforcer certaines de ses parties.The interior of the tank 10 can also be partitioned to reinforce some of its parts.

Le corps en béton 12 contient aussi des entretoises 15, par exemple tubulaires, qui sont interposées entre la semelle 1 et la partie travaillante 16 de la matrice. La cuve 10 est, en outre, munie dans ses parois latérales, de tubes 17 permettant l'engagement de doigts de manutention et de taquets 18 pour la fixation de la matrice à la semelle 1 au moyen de vis 19 ou autres organes appropriés.The concrete body 12 also contains spacers 15, for example tubular, which are interposed between the sole 1 and the working part 16 of the matrix. The tank 10 is, moreover, provided in its lateral walls, with tubes 17 allowing the engagement of handling fingers and tabs 18 for fixing the matrix to the sole 1 by means of screws 19 or other suitable members.

Pour fabriquer la matrice décrite ci-dessus, on procède avantageusement comme représenté à la fig. 2 qui montre une maquette ou modèle 20 de forme complémentaire à celle de la partie travaillante 16 de la matrice. La maquette ou modèle 20 est entouré à sa périphérie par un coffrage 21 par exemple réalisé en bois.To manufacture the matrix described above, the procedure is advantageously as shown in FIG. 2 which shows a model 20 of a shape complementary to that of the working part 16 of the matrix. The model 20 is surrounded at its periphery by a formwork 21, for example made of wood.

Le coffrage 21 est muni, sur son dessus, d'éléments d'habillage 22, par exemple en mousse de résine synthétique, et, de même, des éléments d'habillage 23 sont disposés à la périphérie de la partie travaillante 16. La cuve 10 est mise en place sur les éléments d'habillage 22 ainsi que les tubes entretoises 15, les tubulures de passage 14 et autres accessoires que doit comporter la matrice par exemple les fers à béton 13. Le béton 12 devant former le corps est alors coulé jusqu' à proximité de la partie supérieure 10 de la cuve. De la résine liquide destinée à former une couche de couverture 24, dite gelcoat, est finalement coulée, puis la semelle 1 est mise en place et serrée sur la cuve 10 au moyen des vis 19 et éventuellement de vis 19a pouvant être passées dans les tubes-entretoises 15 pour être vissées dans certaines des parties travaillantes 16.The formwork 21 is provided, on its top, with covering elements 22, for example made of synthetic resin foam, and, likewise, covering elements 23 are arranged at the periphery of the working part 16. The tank 10 is placed on the covering elements 22 as well as the spacer tubes 15, the passage pipes 14 and other accessories which the matrix must include, for example concrete irons 13. The concrete 12 which must form the body is then poured up near the upper part 10 of the tank. Liquid resin intended to form a covering layer 24, called gelcoat, is finally cast, then the sole 1 is put in place and tightened on the tank 10 by means of the screws 19 and possibly of the screws 19a which can be passed through the tubes. - spacers 15 to be screwed into some of the working parts 16.

La couche de couverture 24 est mise en place sous forme liquide et en excès, des évents 25 étant prévus pour éliminer le surplus de résine. On est assuré ainsi que la semelle 1 est en contact étroit avec le corps en béton 12 et que celui-ci est lui-même en contact étroit avec la partie travaillante 16 de la matrice.The cover layer 24 is placed in liquid form and in excess, vents 25 being provided to remove the excess resin. It is thus ensured that the sole 1 is in close contact with the concrete body 12 and that the latter is itself in close contact with the working part 16 of the matrix.

La partie préparée est ensuite retournée, les éléments d'habillage 22 et 23 étant retirés. L'espace laissé libre par les éléments d'habillage 23 est finalement rempli de résine liquide qui est polymérisée pour assurer une liaison parfaite entre la partie travaillante 16 et le corps 12 en béton.The prepared part is then turned over, the covering elements 22 and 23 being removed. The space left free by the covering elements 23 is finally filled with liquid resin which is polymerized to ensure a perfect connection between the working part 16 and the body 12 of concrete.

Comme l'illustre la fig. 3, le poinçon 8 est fabriqué de manière analogue à ce qui vient d'être décrit, c'est-à-dire que sa partie travaillante 26 est mise en place sur une maquette ou modèle 27 puis est reliée à un caisson 28 muni de taquets 18a pour le passage de vis telles que 29, le reliant à la partie travaillante 26.As illustrated in fig. 3, the punch 8 is manufactured in a similar manner to what has just been described, that is to say that its working part 26 is placed on a model or model 27 and is then connected to a box 28 provided with cleats 18a for the passage of screws such as 29, connecting it to the working part 26.

Comme la cuve 10 de la matrice, le caisson 28 est rempli d'un corps en béton 12a. Le caisson 28 sert, de même manière que la cuve 10 de la matrice, à la fixation de divers accessoires notamment de plaques de guidage 30 qui sont destinées à coopérer avec des plaques de guidage 31 du serre-flan.Like the tank 10 of the matrix, the box 28 is filled with a concrete body 12a. The box 28 is used, like the tank 10 of the matrix, for fixing various accessories, in particular guide plates 30 which are intended to cooperate with guide plates 31 of the blank holder.

Lorsque le poinçon 8 est achevé comme décrit ci-dessus, il est mis en place dans la matrice 5 après habillage de celle-ci par une pièce de référence 9 ou en la munissant de cales en laiton d'épaisseur correspondant à la pièce 9.When the punch 8 is completed as described above, it is put in place in the die 5 after dressing thereof by a reference piece 9 or by providing it with brass shims of thickness corresponding to the piece 9.

En se référant de nouveau à la fig. 1, on voit comment il est possible de réaliser finalement le serre-flan 6. On munit la périphérie du corps en béton 12 de la matrice 5 d'éléments d'écartement 32 puis on dispose sur ceux-ci une cuve 33 portant, comme la cuve 10, des accessoires par exemple des tubes 17a pour l'engagement de pièces de manutention, des pattes de scellement 11a, des taquets 18a etc. Une ou des parties travaillantes 34 du serre-flan sont également mises en place pour venir en appui contre la matrice avec interposition du bord de la pièce 9.Referring again to FIG. 1, we see how it is possible to finally make the blank holder 6. We provide the periphery of the concrete body 12 with the matrix 5 of spacing elements 32 and then have thereon a tank 33 carrying, as the tank 10, accessories for example tubes 17a for engaging handling parts, sealing tabs 11a, cleats 18a etc. One or more working parts 34 of the blank holder are also put in place to bear against the die with interposition of the edge of the part 9.

Le ou les bords travaillants 34 peuvent indifféremment être mis en place après ou avant la cuve 33. De la même façon qu'en ce qui concerne la matrice, on dispose des entretoises 35 de préférence tubulaires entre la partie travaillante et le niveau correspondant à la partie supérieure de la cuve 33.Or the working edges 34 can indifferently be put in place after or before the tank 33. In the same way as for the matrix, spacers 35 are preferably tubular between the part working and the level corresponding to the upper part of the tank 33.

Outre de ce qui précède, on met en place sur le dessus du poinçon un fourreau amovible 36 auquel sont fixées de façon également amovible la ou les plaques de guidage 31 qui doivent coopérer avec la ou les plaques de guidage 30 du poinçon. De la même façon qu'expliqué dans ce qui précède, du béton formant un corps 12b est versé dans la cuve 33 jusqu'à proximité de la partie haute de celle-ci, de la résine liquide est ensuite versée puis la semelle 3 est elle-même mise en place et pressée sur la résine liquide et sur le corps en béton 12b par des vis 19a et éventuellement d'autres vis passées dans les entretoises tubulaires 35. Le pressage de la semelle 3 est effectué de préférence alors que celle-ci est montée sur la presse. Lorsque la résine est polymérisée, le fourreau 36 peut être retiré si on le désire.In addition to the foregoing, a removable sheath 36 is placed on top of the punch to which the guide plate (s) 31 are also attached, which must cooperate with the guide plate (s) 30 of the punch. In the same way as explained in the foregoing, concrete forming a body 12b is poured into the tank 33 near the upper part thereof, liquid resin is then poured and then the sole 3 is it -same establishment and pressed on the liquid resin and on the concrete body 12b by screws 19a and possibly other screws passed through the tubular spacers 35. The pressing of the sole 3 is preferably carried out while the latter went up on the press. When the resin is polymerized, the sheath 36 can be removed if desired.

La réalisation décrite ci-dessus fait que les pièces qui sont réalisée les unes à partir des autres assurent un réglage automatique par rapport à la presse qui les porte, ce qui évite ensuite toute reprise d'usinage.The embodiment described above means that the parts which are produced from one another provide automatic adjustment with respect to the press which carries them, which then avoids any resumption of machining.

Les parties travaillantes du jeu d'outils décrit dans ce qui précéde peuvent être réalisées de différentes façons.The working parts of the toolset described in the above can be done in different ways.

Tout d'abord, chaque partie d'outil peut être réalisée en une ou plusieurs pièces. Il est possible aussi que certaines parties présentent des évidements comme montré en 37 et 38 en ce qui concerne respectivement le poinçon et la matrice.First of all, each tool part can be made in one or more pieces. It is also possible that some parts have recesses as shown in 37 and 38 with respect to the punch and the die respectively.

Lorsque de tels évidements sont prévus, il est avantageux que les parties travaillantes telles que 16 et 26 de la matrice et du poinçon soient reliées au béton 12a par des cales d'épaisseur 39, 40, cales d'épaisseur qui ont pour fonction essentielle de transmettre uniformément les efforts de pression au corps en béton 12, 12a.When such recesses are provided, it is advantageous that the working parts such as 16 and 26 of the die and of the punch are connected to the concrete 12a by shims 39, 40, shims which have essential function of uniformly transmitting the pressure forces to the concrete body 12, 12a.

Certaines des parties travaillantes peuvent aussi être renforcées par des lames réalisées en métaux particulièrement durs lorsque certaines desdites parties travaillantes doivent supporter des contraintes d'usure ou de pression particulières.Some of the working parts can also be reinforced by blades made of particularly hard metals when some of said working parts have to withstand particular wear or pressure stresses.

Eu égard au mode de réalisation décrit ci-dessus pour le jeu d'outils de presse, il a été trouvé tout particulièrement avantageux pour la fabrication des parties travaillantes 16, 26 et 34 de réaliser, comme l'illustre la fig. 4, et pour chacune d'elles un modèle 41 en matière fusible ou ne présentant pas de contre-dépouille.With regard to the embodiment described above for the set of press tools, it has been found very particularly advantageous for the manufacture of the working parts 16, 26 and 34 to produce, as illustrated in FIG. 4, and for each of them a model 41 in fusible material or having no undercut.

Le modèle 41 est recouvert par une feuille thermoplastique déformable 42 par exemple en polyéthylène qui est formée sous vide pour épouser très exactement le modèle 41. Une couche d'une matière réfractaire 43, par exemple du zirconium, est ensuite pulvérisée sur la feuille 42, puis l'ensemble est mis en place dans un caisson 44 dans lequel on verse du sable de moulage qui est vibré et auquel on applique un vide poussé par des tubulures telles que 45. De la fonte ou un autre métal approprié à la réalisation des parties travaillantes des outils ci-dessus est alors coulé par un ou des conduits 46, ce qui détruit le modèle et réalise la partie d'outil souhaité aux cotes exactes dudit modèle. Lorsque le modèle ne présente pas de contre-dépouille, il est retiré au préalable.The model 41 is covered by a deformable thermoplastic sheet 42, for example made of polyethylene, which is formed under vacuum to exactly match the model 41. A layer of a refractory material 43, for example zirconium, is then sprayed onto the sheet 42, then the assembly is put in place in a box 44 into which mold sand is vibrated and to which a vacuum is applied pushed by pipes such as 45. Cast iron or another metal suitable for making the parts working of the above tools is then poured through one or more conduits 46, which destroys the model and produces the desired part of the tool at the exact dimensions of said model. When the model does not have an undercut, it is removed beforehand.

Il y a lieu lors de la réalisation du modèle de faire en sorte que les cotes de celui-ci correspondent aux cotes théoriques de l'outil à obtenir tout en tenant compte de la mesure du retrait du métal coulé et refroidi pour l'obtention de la partie travaillante de l'outil. Il devient de la sorte possible de mettre en oeuvre la partie travaillante obtenue directement dans les cuves et caisson propres à chaque élément d'outil décrit dans ce qui précède sans avoir à procéder à des usinages ou rectifications.When making the model, it is necessary to ensure that the dimensions of the latter correspond to the theoretical dimensions of the tool to be obtained while taking into account the measurement of the shrinkage of the cast and cooled metal to obtain the working part of the tool. he thus becomes possible to implement the working part obtained directly in the tanks and casing specific to each tool element described in the foregoing without having to carry out machining or rectifications.

Claims (10)

  1. Composed die set for drawing press comprising plates (2, 4) for causing the relative movement of a male die (8) with respect to a female die (5) as well as a flank-holder (6) for maintaining a flank against the edge of the female die (5) during the relative movement of the male die (8) and female die (5), the female die (5) comprising a working part (16) of metal that cooperates with a working part (26) of the male die (8) also of metal and with a working part (34) of the flank-holder (6) also of metal, one at least of the working parts (16, 26, 34) being supported by a body (12, 12a, 12b) connected to a shoe (1, 3) carried by the press, the female die (5) and the flank-holder (6) being respectively secured to the lower shoe (1) and to the upper shoe (3) of the press, characterized in that the body (12, 12a, 12b) is made of concrete formed by a synthetic resin loaded with mineral material and is contained in a metal tank or case (10, 28, 33) connected to one of the shoes (1, 3) of the press, the composed female die (5) and the composed flank-holder (6) being respectively secured to the lower shoe (1) and to the upper shoe (3) of the press through blocks (18) rigidly connected to the tank or case (10, 28, 33), itself anchored to the concrete by fixing lugs (11), the working parts of metal (26, 34) of the female die (5) and flank-holder (6) being rigid parts supported by spacer members (39, 40) interposed between said working parts of metal (16, 26, 34) and the concrete, and by tubular struts (15, 35) containing screws connecting the working parts of metal (16, 26, 34) with their respective shoe (1, 3).
  2. Composed die set according to claim 1, characterized in that the bodies (12a, 12b) of the male die and flank-holder are provided with complementary guiding plates (30, 31).
  3. Composed die set according to one of claims 1 or 2, characterized in that the tanks or cases (10, 28, 33) of the female die (5), flank-holder (6) and male die (8) are provided with tubes (17, 17a), blocks (18, 18a) etc., at least in part embedded in the body (12, 12a, 12b).
  4. A method for the manufacture of a tool element, female die, male die or flank-holder of a composed die set for a press provided for drawing a part (9), comprising the steps of positioning, on and around a working part (16, 26, 34) of metal, a tank or case (10, 28, 33), pouring a concrete in the tank or case (10, 28, 33) and on the working part (16, 26, 34), said concrete forming the body of the tool, and assembling said working part (16, 26, 34) and said body of the tool to said tank or case (10, 28, 33), characterized in using a concrete formed by a synthetic resin loaded with mineral material, arranging the working part (16, 26, 34) on a design or model, or directly on a corresponding working part (16, 26, 34) of the die set, said working part (16, 26, 34) of metal being a rigid part, positioning spacer members (39, 40) on and around the free surfaces of the working part (16, 26, 34) before the step of pouring the concrete, pouring a gel coat of resin (24), the step of assembling the body of the tool and the working part (16, 26, 34) to the tank or case (10, 28, 33) being made by means of screws inserted in blocks (18, 18a) of said tank or case (10, 28, 33) and in tubular struts (15, 35), said screws respectively connecting the body of the tool and the working parts (16, 26, 34) to the shoes (1, 3) of the press.
  5. Method according to claim 4, characterized in that the resin is poured in a liquid state on said concrete before positioning the shoes (1, 3), the excess of resin being discharged through vents (25) provided in the shoes (1, 3)
  6. Method according to one of claims 4 or 5, characterized in that the working parts (16, 26, 34) are made of cast metal.
  7. Method according to one of claims 4 to 6, characterized in that the working parts (16, 26, 34) are made in a mould designed from a model having sizes that take into account the contraction of the metal used for pouring.
  8. Method according to one of claims 4 to 7, characterized in that the step of moulding the working parts (16, 26, 34) is made under vacuum.
  9. Method according to one of claims 4 to 8, characterized in that the step of positioning at least one shoe (3) is made when this shoe is connected to the press and while the other shoe (1) is already fixed to this press.
  10. Method according to one of claims 4 to 9, characterized in arranging covering elements (22) on casing parts (21) before the step of pouring said concrete in the tank (10), which pouring is made on the side of said tank (10) which is designed to bear against the shoe (1, 3, respectively).
EP19880402846 1987-11-13 1988-11-14 Composed die set for drawing press Expired - Lifetime EP0317412B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8715710 1987-11-13
FR8715710A FR2623111B1 (en) 1987-11-13 1987-11-13 COMPOSITE TOOL SET FOR STAMPING PRESS

Publications (2)

Publication Number Publication Date
EP0317412A1 EP0317412A1 (en) 1989-05-24
EP0317412B1 true EP0317412B1 (en) 1994-05-18

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Application Number Title Priority Date Filing Date
EP19880402846 Expired - Lifetime EP0317412B1 (en) 1987-11-13 1988-11-14 Composed die set for drawing press

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EP (1) EP0317412B1 (en)
DE (1) DE3889630T2 (en)
ES (1) ES2054850T3 (en)
FR (1) FR2623111B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4976400A (en) * 1989-06-16 1990-12-11 General Motors Corporation Plastic tooling with compression adjustment
CN116394002B (en) * 2023-02-23 2023-09-15 深圳市永义模具有限公司 Automatic polishing combined die after molding

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1935916A (en) * 1928-06-06 1933-11-21 Budd Edward G Mfg Co Metal die and method of making the same
US3239590A (en) * 1962-01-29 1966-03-08 Budd Co Method of making composite structure of plastic, especially forming die
FR2221201A1 (en) * 1973-03-15 1974-10-11 Arnaud Stamps dies and matrixes for presses - compositely constructed of metallic working faces on thermal-setting plastic
FR2314803A1 (en) * 1975-06-20 1977-01-14 Matra Engins Copying machining patterns comprising sheet metal profiles - with rigid foam support, for reproducing tools without machining operations
JPS58151925A (en) * 1982-03-03 1983-09-09 Nissan Motor Co Ltd Simplified pressing die
US4601867A (en) * 1984-07-03 1986-07-22 General Motors Corporation Method of making cast-to-size epoxy tools for stamping sheet metal panels

Also Published As

Publication number Publication date
EP0317412A1 (en) 1989-05-24
DE3889630D1 (en) 1994-06-23
DE3889630T2 (en) 1994-12-01
FR2623111B1 (en) 1994-05-27
ES2054850T3 (en) 1994-08-16
FR2623111A1 (en) 1989-05-19

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