EP2382064B1 - Press tooling - Google Patents

Press tooling Download PDF

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Publication number
EP2382064B1
EP2382064B1 EP10701002A EP10701002A EP2382064B1 EP 2382064 B1 EP2382064 B1 EP 2382064B1 EP 10701002 A EP10701002 A EP 10701002A EP 10701002 A EP10701002 A EP 10701002A EP 2382064 B1 EP2382064 B1 EP 2382064B1
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EP
European Patent Office
Prior art keywords
armature
tube
insert
housing
recess
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP10701002A
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German (de)
French (fr)
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EP2382064A1 (en
Inventor
Gérard DELETTE
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Commissariat a lEnergie Atomique CEA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/022—Moulds for compacting material in powder, granular of pasta form
    • B30B15/024—Moulds for compacting material in powder, granular of pasta form using elastic mould parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B22F3/03—Press-moulding apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds

Definitions

  • the subject of the invention is a press tool according to the preamble of claim 1.
  • the manufacture of mechanical parts by powder pressing to give a compact blank, followed by sintering may involve the use of uniaxial compression machines comprising a die consisting of a housing into which the powder is poured and a punch s engaging in the housing to effect compression of the powder or, alternatively, a pair of punches engaging two opposite ends of the housing in two opposite directions. These presses operate at relatively high rates.
  • the applications are numerous: they may concern mechanical metal or ceramic parts such as gears, magnets, nuclear fuel pellets, etc.
  • Still other methods include adding rubber or other flexible materials to the matrix that facilitate demolding and are then sacrificed, but this is also expensive.
  • a variation of this design is to clamp the die by springs, external pressure, or any other means to reduce its diameter during pressing; it is exposed in the documents EP - A - 1,602,473 , US - A - 5,694,640 and in the article of Holownia "Balanced die method for metal powder compaction", published in Powder Metallurgy, vol.39, No. 3, Money Publishing .
  • the clamping is stopped after pressing, which allows the die to expand to reduce the extraction friction of the formed part and thus facilitate demolding.
  • the technical problem is somewhat different, and these methods do not contribute to improving the transition of the constraints at the exit of the matrix between the unmolded portion and the portion still retained in the matrix. It should also be noted that, in these examples, the centripetal pressure is applied only to the center of the matrix, while the edges are held rigidly in the apparatus and therefore have no flexibility.
  • the invention has been designed to obviate these disadvantages and allow automatic compression and reliable parts at high rates while reducing the risk of damage to the mold and subsequent defects in shape and size.
  • the invention thus relates to a press tool comprising a die, an armature external to the die, a flexible tube delimiting a central recess in which coin pressings are made, and an insert disposed between the flexible tube. and the frame and mobile under the action of a mechanism, characterized in that the insert slides on the tube and extends to an end of the tube through which the pressed pieces are extracted from the housing, and in that that the insert releases said end, which remains separated from the armature by a game, in another position.
  • This arrangement has the effect of allowing the tube to flex by expanding near the release orifice, and thus partially yield to the internal compressive stresses of the part. These internal stresses partially relax before demolding, with a progression towards the demolding orifice, so that the transition between the demolded parts and the parts still present in the housing is greatly attenuated when the part is demolded, and the concentrations traditionally observed strain at the junction between these two states of the room are extremely reduced or even disappeared.
  • the flexible tube is superior to the traditional chamfer or rounding at the top of the housing as it flexes according to the distribution of the internal stresses in the demolding direction and thus that it takes of itself a profile to greatly reduce the stress concentrations. And it gives a simpler design matrix than the segmented dies, and without the risk of a bad closure of the housing.
  • the tube is joined to the frame by a flange at one end of the armature opposite to the extraction location, the frame includes a recess partially delimited by the collar, and the insert comprises a movable protrusion in the recess between stop states on opposite walls of the recess.
  • the figure 1 represents a press comprising a control system 1, an upper punch 2, a lower punch 3 and a tool 4 specific to the invention which comprises a die 5.
  • the upper punch 2 and the lower punch 3 comprise rods 6 and 7 directed towards each other.
  • the matrix 5 comprises a housing 8 in the alignment of the rods 6 and 7, which can penetrate between the orifices 9 and 10 opposite.
  • the lower piston 3 and its rod 7 comprise a needle 37 which slides therein, and the rod 6 of the upper piston 2 comprises a housing 11 in front of the needle 37, which can enter therein. This arrangement makes it possible to compress hollow pieces of annular shape.
  • the invention is not limited to this situation and also relates to presses without a needle, possibly with a single punch; the dwelling would then be provided with a single orifice and would include a bottom on the other side.
  • the control system 1 governs the movement of the punches 2 and 3 and the needle 37.
  • the matrix 5 is composed of an armature 15 which is a main portion thereof, a flexible tube 16 surrounded by the frame 15 with a clearance and which delimits the housing 8, and an insert 17 of cylindrical shape and introduced between the two previous under a slippery fit.
  • the tube 16 is joined to the armature 15 by a lower flange 18 (on the side of the lower punch 3), and which delimits a recess 19 with the armature 15.
  • the insert 17 comprises a radial protrusion 20 present in the recess 19, in which it can move in the vertical direction to abut on opposite surfaces of the recess 19.
  • a control mechanism 21 acts on the insert 17 allowing it to move vertically between the two stop positions mentioned above. It may be a rod penetrating into a passage 22 of the armature 15 and attached to the protrusion 20. The rod is controlled by a means such as a jack connected to the armature 15.
  • the tube 16 An essential property of the tube 16 is that it must be flexible enough to be able to expand, this flexibility is dictated by its thickness. It must be thin, for example of thickness between 0.5 and 1 mm if it is constructed of tungsten carbide, which has good wear resistance.
  • the insert 17 is normally thicker, but its dimensions are not critical, and it can consist of a steel tube 2 to 10 mm thick.
  • the armature 15 may be in the form of a cylindrical sleeve 10 to 15 mm thick, still made of steel.
  • the insert completely withdraws from contact with the tube so as to eliminate the friction forces during demolding. It is then necessary to develop a sliding zone large enough to disengage these two elements from one another.

Description

Le sujet de l'invention est un outillage de presse selon le préambule de la revendication 1.The subject of the invention is a press tool according to the preamble of claim 1.

La fabrication des pièces mécaniques par un pressage de poudres pour donner une ébauche compacte, suivi d'un frittage, peut impliquer l'emploi de machines de compression uniaxiale comprenant une matrice constituée d'un logement dans lequel la poudre est versée et un poinçon s'engageant dans le logement pour réaliser la compression de la poudre ou, en variante, une paire de poinçons s'engageant par deux extrémités opposées du logement dans deux sens opposés. Ces presses fonctionnent à des cadences relativement élevées. Les applications sont nombreuses: elles peuvent concerner des pièces mécaniques en métal ou en céramique comme les engrenages, les aimants, les pastilles des combustibles nucléaires, etc.The manufacture of mechanical parts by powder pressing to give a compact blank, followed by sintering, may involve the use of uniaxial compression machines comprising a die consisting of a housing into which the powder is poured and a punch s engaging in the housing to effect compression of the powder or, alternatively, a pair of punches engaging two opposite ends of the housing in two opposite directions. These presses operate at relatively high rates. The applications are numerous: they may concern mechanical metal or ceramic parts such as gears, magnets, nuclear fuel pellets, etc.

Ce genre de procédé présente toutefois des inconvénients. L'un des plus importants apparaît au démoulage de la pièce comprimée en la sortant progressivement du logement par un mouvement axial de poussée du poinçon. La compression a produit des contraintes radiales dans la pièce, qui se libèrent à mesure qu'elle sort du logement en produisant une dilatation radiale. Les risques d'endommagement de la pièce par fissuration ou rupture sont fréquents à l'orifice du logement, entre les portions encore contraintes et les portions subitement relâchées, où des concentrations de contrainte apparaissent. Divers procédés ont été employés pour améliorer la qualité des pièces. On peut citer l'utilisation d'additifs lubrifiants ou liants dans les poudres ou le choix de séquences particulières de compression par les poinçons; mais les additifs nuisent au frittage puisqu'ils sont volatils et peuvent être polluants, et les seconds procédés ralentissent beaucoup les cadences de production. Ces deux groupes de procédés remédient d'ailleurs plutôt à d'autres défauts, comme une cohésion insuffisante de la matière après la compression.This kind of process, however, has disadvantages. One of the most important appears in the release of the compressed part gradually out of the housing by an axial movement of pushing the punch. The compression has produced radial stresses in the workpiece, which are released as it exits the housing producing radial expansion. The risks of damage to the part by cracking or rupture are frequent at the orifice of the housing, between the portions still constrained and the portions suddenly released, where stress concentrations appear. Various processes have been employed to improve the quality of the parts. Mention may be made of the use of lubricant additives or binders in powders or the choice of particular compression sequences by the punches; but the additives interfere with sintering since they are volatile and can be pollutants, and the second processes slow down the production rates considerably. These two groups of processes moreover remedy other defects, such as insufficient cohesion of the material after compression.

D'autres procédés consistent à pourvoir l'orifice du logement de la matrice d'un chanfrein ou d'un rayon de raccordement pour éviter à la pièce en cours de démoulage une transition brusque entre l'état contraint et l'état relâché, mais ce procédé est efficace seulement avec des profils d'orifice bien déterminés et particuliers à chaque variétés de pièces, de sorte qu'il est difficile à mettre en oeuvre.Other methods consist in providing the orifice of the housing of the matrix of a chamfer or a connecting radius to avoid the part being demolded an abrupt transition between the constrained state and the relaxed state, but this method is effective only with well defined orifice profiles and particular to each variety of parts, so that it is difficult to implement.

D'autres procédés encore consistent à ajouter dans la matrice des tubes de caoutchouc ou d'autres matières souples qui facilitent le démoulage et sont ensuite sacrifiés, mais cela est aussi coûteux.Still other methods include adding rubber or other flexible materials to the matrix that facilitate demolding and are then sacrificed, but this is also expensive.

Enfin, un autre genre de procédés, décrit par exemple dans le document US-B-7 128 547 , consiste à diviser la matrice en secteurs qui sont assemblés pendant l'exécution de la compression et écartés ensuite de manière à relâcher les contraintes de compression résiduelle à la fois pour toute la pièce. Les réalisations de tels procédés souvent ne comprennent pas de moyen pour retenir les secteurs de matrice une fois qu'elle a été desserrée, ce qui les rend inaptes à l'automatisation. D'autres comportent un mécanisme de commande des mouvements des secteurs permettant d'automatiser le procédé, mais ils sont complexes, imposant l'emploi d'actionneurs des secteurs, et ils ne garantissent pas vraiment que les secteurs sont bien jointifs quand la poudre est versée, ce qui est nécessaire pour une bonne fabrication.Finally, another kind of process, described for example in the document US-B-7 128,547 consists in dividing the matrix into sectors that are assembled during compression execution and then discarded so as to release the residual compressive stresses both for the whole part. The achievements of such processes often do not There is no way to restrain the die sectors once it has been loosened, rendering them unsuitable for automation. Others have a sector motion control mechanism to automate the process, but they are complex, requiring the use of sector actuators, and they do not really guarantee that the sectors are well joined when the powder is paid, which is necessary for good manufacturing.

Une variante de cette conception consiste à serrer la matrice par des ressorts, une pression externe ou tout autre moyen pour réduire son diamètre pendant le pressage ; elle est exposée dans les documents EP - A - 1 602 473 , US - A - 5 694 640 et dans l'article de Holownia « Balanced die method for metal powder compaction », paru dans Powder Metallurgy, vol.39, n°3, Money Publishing . Le serrage est arrêté après le pressage, ce qui permet à la matrice de se dilater pour réduire le frottement d'extraction de la pièce formée et faciliter ainsi le démoulage. Le problème technique est quelque peu différent, et ces procédés ne contribuent pas à améliorer la transition des contraintes à la sortie de la matrice entre la portion démoulée et la portion encore retenue dans la matrice. Il est d'ailleurs à remarquer que, dans ces exemples, la pression centripète est appliquée seulement au centre de la matrice, alors que les bords sont retenus rigidement dans l'appareil et ne possèdent donc aucune souplesse.A variation of this design is to clamp the die by springs, external pressure, or any other means to reduce its diameter during pressing; it is exposed in the documents EP - A - 1,602,473 , US - A - 5,694,640 and in the article of Holownia "Balanced die method for metal powder compaction", published in Powder Metallurgy, vol.39, No. 3, Money Publishing . The clamping is stopped after pressing, which allows the die to expand to reduce the extraction friction of the formed part and thus facilitate demolding. The technical problem is somewhat different, and these methods do not contribute to improving the transition of the constraints at the exit of the matrix between the unmolded portion and the portion still retained in the matrix. It should also be noted that, in these examples, the centripetal pressure is applied only to the center of the matrix, while the edges are held rigidly in the apparatus and therefore have no flexibility.

L'invention a été conçue pour obvier à ces inconvénients et permettre une compression automatique et fiable de pièces à cadence élevée tout en réduisant les risques de dommages au démoulage et les défauts ultérieurs de forme et de dimension.The invention has been designed to obviate these disadvantages and allow automatic compression and reliable parts at high rates while reducing the risk of damage to the mold and subsequent defects in shape and size.

Sous une forme générale, l'invention concerne ainsi un outillage de presse comprenant une matrice, une armature extérieure à la matrice, un tube flexible délimitant un logement central dans lequel des pressages de pièces sont effectués, et un insert, disposé entre le tube flexible et l'armature et mobile sous l'action d'un mécanisme, caractérisé en ce que l'insert glisse sur le tube et s'étend jusqu'à une extrémité du tube par laquelle les pièces pressées sont extraites du logement, et en ce que l'insert dégage ladite extrémité, qui reste separée de l'armature par un jeu, dans une autre position.In a general form, the invention thus relates to a press tool comprising a die, an armature external to the die, a flexible tube delimiting a central recess in which coin pressings are made, and an insert disposed between the flexible tube. and the frame and mobile under the action of a mechanism, characterized in that the insert slides on the tube and extends to an end of the tube through which the pressed pieces are extracted from the housing, and in that that the insert releases said end, which remains separated from the armature by a game, in another position.

Cette disposition a pour effet de permettre au tube de fléchir en se dilatant à proximité de l'orifice de démoulage, et de céder ainsi partiellement aux contraintes internes de compression de la pièce. Ces contraintes internes se relâchent partiellement avant le démoulage, avec une progression vers l'orifice de démoulage, de sorte que la transition entre les parties démoulées et les parties encore présentes dans le logement est beaucoup atténuée au démoulage de la pièce, et que les concentrations de contrainte traditionnellement observées à la jonction entre ces deux états de la pièce sont extrêmement réduites ou même ont disparu.This arrangement has the effect of allowing the tube to flex by expanding near the release orifice, and thus partially yield to the internal compressive stresses of the part. These internal stresses partially relax before demolding, with a progression towards the demolding orifice, so that the transition between the demolded parts and the parts still present in the housing is greatly attenuated when the part is demolded, and the concentrations traditionally observed strain at the junction between these two states of the room are extremely reduced or even disappeared.

Le tube flexible est supérieur au chanfrein ou à l'arrondi traditionnel au sommet du logement en tant qu'il fléchit en fonction de la répartition des contraintes internes dans la direction de démoulage et donc qu'il prend de lui-même un profil permettant de réduire fortement les concentrations de contrainte. Et il donne une matrice de conception plus simple que les matrices segmentées, et dépourvue du risque d'une mauvaise fermeture du logement.The flexible tube is superior to the traditional chamfer or rounding at the top of the housing as it flexes according to the distribution of the internal stresses in the demolding direction and thus that it takes of itself a profile to greatly reduce the stress concentrations. And it gives a simpler design matrix than the segmented dies, and without the risk of a bad closure of the housing.

Dans un mode préféré de réalisation de l'invention, le tube est uni à l'armature par une collerette à une extrémité de l'armature opposée à l'emplacement d'extraction, l'armature englobe un évidement délimité partiellement par la collerette, et l'insert comprend une excroissance mobile dans l'évidement entre des états de butée sur des parois opposées de l'évidement.In a preferred embodiment of the invention, the tube is joined to the frame by a flange at one end of the armature opposite to the extraction location, the frame includes a recess partially delimited by the collar, and the insert comprises a movable protrusion in the recess between stop states on opposite walls of the recess.

L'invention sera maintenant décrite en liaison aux figures suivantes:

  • la figure 1 illustre une presse munie d'un outillage,
  • la figure 2 illustre le phénomène qu'on rencontre,
  • la figure 3 illustre la matrice,
  • la figure 4 illustre un autre état de la matrice,
  • et la figure 5 illustre le démoulage.
The invention will now be described with reference to the following figures:
  • the figure 1 illustrates a press equipped with tools,
  • the figure 2 illustrates the phenomenon we encounter,
  • the figure 3 illustrates the matrix,
  • the figure 4 illustrates another state of the matrix,
  • and the figure 5 illustrates the demolding.

La figure 1 représente une presse comprenant un système de commande 1, un poinçon supérieur 2, un poinçon inférieur 3 et un outillage 4 spécifique à l'invention qui comprend une matrice 5. Le poinçon supérieur 2 et le poinçon inférieur 3 comprennent des tiges 6 et 7 dirigées l'une vers l'autre. La matrice 5 comprend un logement 8 dans l'alignement des tiges 6 et 7, qui peuvent y pénétrer entre des orifices 9 et 10 opposés. Le piston inférieur 3 et sa tige 7 comprennent une aiguille 37 qui y coulisse, et la tige 6 du piston supérieur 2 comprend un logement 11 en face de l'aiguille 37, qui peut y pénétrer. Cette disposition permet de comprimer des pièces creuses, de forme annulaire. L'invention n'est pas limitée à cette situation et concerne aussi des presses dépourvues d'aiguille, éventuellement à poinçon unique; le logement serait alors pourvu d'un seul orifice et comprendrait un fond de l'autre côté. Le système de commande 1 régit le mouvement des poinçons 2 et 3 et de l'aiguille 37.The figure 1 represents a press comprising a control system 1, an upper punch 2, a lower punch 3 and a tool 4 specific to the invention which comprises a die 5. The upper punch 2 and the lower punch 3 comprise rods 6 and 7 directed towards each other. The matrix 5 comprises a housing 8 in the alignment of the rods 6 and 7, which can penetrate between the orifices 9 and 10 opposite. The lower piston 3 and its rod 7 comprise a needle 37 which slides therein, and the rod 6 of the upper piston 2 comprises a housing 11 in front of the needle 37, which can enter therein. This arrangement makes it possible to compress hollow pieces of annular shape. The invention is not limited to this situation and also relates to presses without a needle, possibly with a single punch; the dwelling would then be provided with a single orifice and would include a bottom on the other side. The control system 1 governs the movement of the punches 2 and 3 and the needle 37.

Le problème affronté au cours du démoulage est illustré à la figure 2, dans le cas où le piston inférieur 3 effectue le démoulage, la pièce étant référencée par 12. En dépassant l'orifice 13 du logement 8, la libération des contraintes internes en direction radiale produit une dilatation en forme de coin 14, qui cause des concentrations de contrainte importantes et qu'on cherche à éviter avec l'invention.The problem faced during demolding is illustrated in figure 2 , in the case where the lower piston 3 demolding, the part being referenced by 12. Exceeding the orifice 13 of the housing 8, the release of the internal stresses in the radial direction produces a wedge-shaped expansion 14, which causes important stress concentrations and that one seeks to avoid with the invention.

On se reporte à la figure 3. La matrice 5 est composée d'une armature 15 qui en est une portion principale, un tube 16 flexible entouré par l'armature 15 avec un jeu et qui délimite le logement 8, et un insert 17 de forme cylindrique et introduit entre les deux précédents sous un ajustement glissant. Le tube 16 est uni à l'armature 15 par une collerette 18 inférieure (du côté du poinçon inférieur 3), et qui délimite un évidement 19 avec l'armature 15. L'insert 17 comprend une excroissance 20 radiale présente dans l'évidement 19, dans lequel elle peut se déplacer en direction verticale jusqu'à entrer en butée sur des surfaces opposées de l'évidement 19. Un mécanisme de commande 21 agit sur l'insert 17 en lui permettant de se déplacer verticalement entre les deux positions de butée évoquées ci-dessus. Il peut s'agir d'une tige pénétrant dans un passage 22 de l'armature 15 et attachée à l'excroissance 20. La tige est commandée par un moyen tel qu'un vérin lié à l'armature 15.We refer to the figure 3 . The matrix 5 is composed of an armature 15 which is a main portion thereof, a flexible tube 16 surrounded by the frame 15 with a clearance and which delimits the housing 8, and an insert 17 of cylindrical shape and introduced between the two previous under a slippery fit. The tube 16 is joined to the armature 15 by a lower flange 18 (on the side of the lower punch 3), and which delimits a recess 19 with the armature 15. The insert 17 comprises a radial protrusion 20 present in the recess 19, in which it can move in the vertical direction to abut on opposite surfaces of the recess 19. A control mechanism 21 acts on the insert 17 allowing it to move vertically between the two stop positions mentioned above. It may be a rod penetrating into a passage 22 of the armature 15 and attached to the protrusion 20. The rod is controlled by a means such as a jack connected to the armature 15.

Pendant la plus grande partie du processus de fabrication, l'état est celui de la figure 3, où l'insert 17 est relevé et arrive au ras du tube 16, affleurant à l'orifice 13 du logement, l'excroissance 20 butant contre la face supérieure de l'évidement 19. Et quand le démoulage est entrepris, l'insert 17 est abaissé jusqu'à entrer en butée avec la face inférieure de l'évidement 19. Cet état est représenté à la figure 4. Il apparait un jeu 23 entre le sommet du tube 16 et l'armature 15. Quand le démoulage se produit, ce qu'on a illustré à la figure 5, le sommet du tube 16, situé devant le jeu 23, a la faculté de se dilater quand la pièce 12 arrive à sa hauteur puis subit le démoulage, ce qui réduit les concentrations de contrainte à l'orifice 13 du logement 8.During most of the manufacturing process, the condition is that of figure 3 , where the insert 17 is raised and comes flush with the tube 16, flush with the hole 13 of the housing, the protrusion 20 abutting against the upper face of the recess 19. And when the mold is removed, the insert 17 is lowered to abut with the underside of the recess 19. This state is shown in FIG. figure 4 . There appears a clearance 23 between the top of the tube 16 and the frame 15. When the demolding occurs, what has been illustrated in the figure 5 , the top of the tube 16, located in front of the game 23, has the ability to expand when the piece 12 reaches its height and undergoes demolding, which reduces the stress concentrations at the orifice 13 of the housing 8.

Une propriété essentielle du tube 16 est qu'il doit être suffisamment souple pour pouvoir se dilater, cette souplesse est dictée par son épaisseur. Il doit donc être fin, par exemple d'épaisseur comprise entre 0,5 et 1 mm s'il est construit en carbure de tungstène, qui présente une bonne résistance à l'usure. L'insert 17 est normalement plus épais, mais ses dimensions ne sont pas critiques, et il peut consister en un tube en acier de 2 à 10 mm d'épaisseur. Enfin, l'armature 15 peut être en forme de manchon cylindrique de 10 à 15 mm d'épaisseur, encore en acier.An essential property of the tube 16 is that it must be flexible enough to be able to expand, this flexibility is dictated by its thickness. It must be thin, for example of thickness between 0.5 and 1 mm if it is constructed of tungsten carbide, which has good wear resistance. The insert 17 is normally thicker, but its dimensions are not critical, and it can consist of a steel tube 2 to 10 mm thick. Finally, the armature 15 may be in the form of a cylindrical sleeve 10 to 15 mm thick, still made of steel.

Selon un développement de l'invention, dans le cadre de son fonctionnement, on peut prévoir que l'insert se retire totalement du contact avec le tube de manière à éliminer les forces de friction lors du démoulage. Il convient alors d'aménager une zone de glissement suffisamment importante pour dégager ces deux éléments l'un de l'autre.According to a development of the invention, in the context of its operation, it can be provided that the insert completely withdraws from contact with the tube so as to eliminate the friction forces during demolding. It is then necessary to develop a sliding zone large enough to disengage these two elements from one another.

Claims (2)

  1. A press tool including a die (5), an armature (15) external to the die, a flexible tube (16) forming a central housing (8) in which part pressings (12) are accomplished, and an insert (17), positioned between the flexible tube and the armature, and which is mobile when moved by a mechanism (21), characterised in that the insert slides over the tube and extends as far as one end of the tube, by which the pressed parts are extracted from the housing, and in that the insert releases the said end, which remains separated from the armature by a gap, in another position.
  2. A tool according to claim 1, characterised in that the tube is joined to the armature by a skirt (18) at one end of the armature opposite the extraction position, the armature encompasses a recess (19) partially formed by the skirt, and the insert (17) includes a moving protruberance (20) in the recess between stop states on facing walls of the recess.
EP10701002A 2009-01-23 2010-01-19 Press tooling Not-in-force EP2382064B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0950407A FR2941636B1 (en) 2009-01-23 2009-01-23 PRESS TOOLS
PCT/EP2010/050555 WO2010084110A1 (en) 2009-01-23 2010-01-19 Press tooling

Publications (2)

Publication Number Publication Date
EP2382064A1 EP2382064A1 (en) 2011-11-02
EP2382064B1 true EP2382064B1 (en) 2012-11-07

Family

ID=40823500

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10701002A Not-in-force EP2382064B1 (en) 2009-01-23 2010-01-19 Press tooling

Country Status (7)

Country Link
US (1) US8647563B2 (en)
EP (1) EP2382064B1 (en)
JP (1) JP5627605B2 (en)
KR (1) KR101698077B1 (en)
ES (1) ES2399334T3 (en)
FR (1) FR2941636B1 (en)
WO (1) WO2010084110A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102189706B (en) * 2011-01-28 2014-10-08 南京理工大学 High-pressure shearing deformation method and device for tubular materials
KR101493974B1 (en) * 2013-05-24 2015-02-17 한국전기연구원 Production method of silicon-busbar
CN106077634B (en) * 2016-08-24 2018-06-12 广州晶体科技有限公司 Beading cold stamping die and the beading production method using the cold stamping die
CN106077633B (en) * 2016-08-24 2018-06-12 广州晶体科技有限公司 Beading cold stamping die and the beading production method using the cold stamping die
CN111590069A (en) * 2020-06-28 2020-08-28 南安市铭基金刚石工具有限公司 Cold pressing equipment and cold pressing method of bead stringing machine

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Publication number Priority date Publication date Assignee Title
US2558823A (en) * 1949-05-27 1951-07-03 Henry L Crowley Apparatus for molding articles
US2942298A (en) * 1954-12-28 1960-06-28 Unexcelled Chemical Corp Molding apparatus
SU454133A1 (en) * 1973-01-26 1974-12-25 Предприятие П/Я В-8469 Mold for isostatic pressing of products
SU1303436A1 (en) * 1985-03-04 1987-04-15 Пермский политехнический институт Press mould for compression moulding of powdery materials with friction coefficient
SU1315135A1 (en) * 1986-01-02 1987-06-07 Всесоюзный научно-исследовательский и проектный институт тугоплавких металлов и твердых сплавов Die-casting mould
GB9318581D0 (en) * 1993-09-08 1993-10-27 Manganese Bronze Ltd Method of and apparatus for producing a compression product
US7128547B2 (en) 2004-01-13 2006-10-31 Chien-Min Sung High pressure split die and associated methods
DE102004026969A1 (en) * 2004-06-02 2005-12-29 Sms Meer Gmbh Device for producing a molded part from powder
ATE413256T1 (en) * 2005-07-19 2008-11-15 Abrasive Tech Inc METHOD AND DEVICE FOR PRODUCING GRINDING TOOLS
US7381046B2 (en) * 2006-06-27 2008-06-03 Fu Chin Kuo Lipstick making device
AT505947B1 (en) * 2007-11-14 2016-04-15 Miba Sinter Austria Gmbh COMPRESSION TOOL

Also Published As

Publication number Publication date
KR20110112814A (en) 2011-10-13
JP5627605B2 (en) 2014-11-19
FR2941636B1 (en) 2012-12-07
KR101698077B1 (en) 2017-01-19
US20110280982A1 (en) 2011-11-17
US8647563B2 (en) 2014-02-11
WO2010084110A1 (en) 2010-07-29
FR2941636A1 (en) 2010-08-06
JP2012515652A (en) 2012-07-12
ES2399334T3 (en) 2013-03-27
EP2382064A1 (en) 2011-11-02

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