EP3240650A1 - Electrohydraulic forming apparatus - Google Patents

Electrohydraulic forming apparatus

Info

Publication number
EP3240650A1
EP3240650A1 EP15823172.0A EP15823172A EP3240650A1 EP 3240650 A1 EP3240650 A1 EP 3240650A1 EP 15823172 A EP15823172 A EP 15823172A EP 3240650 A1 EP3240650 A1 EP 3240650A1
Authority
EP
European Patent Office
Prior art keywords
piston
zone
electro
hydroforming device
mold
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.)
Granted
Application number
EP15823172.0A
Other languages
German (de)
French (fr)
Other versions
EP3240650B1 (en
Inventor
Eran PLAUT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ADM28 SARL
Original Assignee
ADM28 SARL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ADM28 SARL filed Critical ADM28 SARL
Publication of EP3240650A1 publication Critical patent/EP3240650A1/en
Application granted granted Critical
Publication of EP3240650B1 publication Critical patent/EP3240650B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/06—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure by shock waves
    • B21D26/12—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure by shock waves initiated by spark discharge

Definitions

  • the present invention relates to an electro-hydroforming device.
  • Electro-hydroforming devices are increasingly used for the production of mechanical parts. Indeed, these forming devices make it possible to obtain parts of relatively complex appearance while controlling production costs. For example, the automotive and aerospace industries use such devices.
  • a hydroforming process is a process of manufacture by deformation. It allows the plastic deformation of a metal part of a relatively small thickness. To achieve this deformation, a fluid is used which, when pressurized, allows the deformation of said piece on a mold. Several techniques are used to pressurize the fluid.
  • electro-hydroforming process One of the processes used is a so-called electro-hydroforming process. This process is based on the principle of an electric discharge in the fluid stored in a tank. The amount of electrical energy released generates a wave whose propagation in the fluid is very fast and allows the plastic deformation of the mechanical part against the mold. To do this, electrodes positioned in the fluid released an electric charge stored in energy storage capacities.
  • the deformation of the part is proportional to the volume of water displaced during the explosion generated by the electric arc.
  • a step of emptying the tank is necessary after each explosion to recover the formed part.
  • US Pat. No. 7,437,787 discloses an electro-hydroforming device in which a membrane is used to retain two volumes of liquid.
  • a device adapted to generate a high voltage pulse is coupled to electrodes to create a shock wave in one of the liquid volumes.
  • the shock wave thus generated is transferred through the membrane to the other volume of liquid for deforming a piece against a mold. Thanks to the use of the membrane separating the two volumes of liquid, only the volume of liquid in which the part to be deformed is to be emptied during a change of room, which improves productivity.
  • the workpiece is protected from particles from electrode wear.
  • such a device is of relatively complex design because composed of at least three parts.
  • the strength of the membrane directly affects the reliability of the device.
  • the use of the membrane allows only a simple transmission of the shock wave.
  • the present invention therefore aims to provide an electro-hydroforming device of relatively simple design that is to say preferably comprising only two parts with improved reliability compared to devices of the prior art.
  • the present invention advantageously provides an electro-hydroforming device having a controlled manufacturing cost while complying with the standards in force.
  • the part to be formed is protected from the particles resulting from the wear of the electrodes, which makes it possible to obtain parts with a desired surface state.
  • the present invention proposes an electro-hydroforming device comprising a mold with an upper part and a lower part, an enclosure having a first zone, a second zone, a mold cavity positioned in the second zone and electrodes. having electrode ends positioned in the first zone, characterized in that a piston is movably mounted in translation in a sealed conduit and separates the first zone from the second zone of the enclosure.
  • the piston may have first complementary guide means second guide means of the conduit.
  • the guide means have three ribs for limiting to one the degrees of freedom of the piston.
  • the second guide means have three grooves, thus making it possible to optimize displacements in translation of the piston in the conduit.
  • the piston has a first face having a flat shape and directed towards the mold cavity.
  • the piston may have a first face having a shape selected from the set of concave and convex shapes and directed towards the mold cavity.
  • the piston has a second face adapted to the shape of the chamber and directed towards the first zone.
  • the piston has for example a second face having a shape selected from the set of concave and convex shapes and directed towards the first zone.
  • the conduit may have a stop adapted to hold the piston.
  • a spring can be positioned between the piston and the abutment to improve the reproducibility of details on parts to be deformed. Indeed, thanks to the presence of the spring, the piston is reduced to a determined altitude and identical after each emptying of the mold.
  • FIG. 1 is a schematic cross-sectional schematic view of an electro-hydroforming device according to the present invention
  • FIG. 2 is a simplified schematic view corresponding to the figure 1 in another position
  • FIG. 3 is an enlarged and simplified schematic view of a detail of embodiment of another embodiment of the invention.
  • Figure 4 shows different forms of pistons.
  • FIG. 1 is a schematic representation of an electro-hydroforming device 2 comprising a mold 4 having an upper part 6, a lower part 8, an enclosure 10, a conduit 12, a mold cavity 14 positioned in the lower part. 8 and electrodes 16.
  • Such an electro-hydroforming device 2 can be arranged on a frame
  • the upper part 6 of the mold 4 is in the embodiment shown in the drawing placed above the lower part 8 of the mold 4.
  • the lower part 8 is fixed to the upper part 6 by means of, for example, tightening (not shown in the figures).
  • the mold 4 (comprising the upper part 6 and the lower part 8) is composed of a high density material such as a metal or a metal alloy.
  • the enclosure 10 has a first zone 18, a second zone 20 and the conduit 12. As illustrated in FIG. 1, the enclosure 10 has a first wall 22 having a shape of revolution with respect to an axis AA 'and is example of cylindrical shape with a determined diameter.
  • the enclosure 10 also has a second wall 24 of frustoconical shape connected to the first wall 22 and the other to the conduit 12.
  • the chamber 10 is also adapted to receive in the first zone 18 of the ends 26 of the electrodes 16.
  • the electrodes 16 are high voltage electrodes (several tens of kV). These are here maintained perpendicular to the axis of revolution A-A '( Figure 1).
  • an insulating sleeve 28 is used.
  • the electrodes 16 also have an inter-electrode gap adjustable and modifiable which makes it possible to control a tripping of an electric arc between them.
  • an electrical storage device (not shown in the figures) adapted to store a sufficient amount of electrical energy to generate at least one electric arc between the electrodes 16.
  • a pulse generator (not shown in the figures) is coupled to the energy storage device.
  • the pulse generator and the electrical storage device being known to those skilled in the art, they are not presented in the present description.
  • the duct 12 has a cylindrical circular shape and has a determined length sufficient to allow displacements of a piston 30 corresponding to the deformation to be made to a part placed facing the mold cavity 14.
  • duct 12 is also adapted to the mold cavity 14.
  • the lower part 8 receives the mold cavity 14 which defines the final shape to be given to the part 32 that it is desired to achieve by Electro-Hydro-Forming (EHF).
  • EHF Electro-Hydro-Forming
  • the mold cavity 14 may have, depending on the complexity of the shape of the part 32 to deform a large form factor with details of great accuracy.
  • the lower portion 8 may comprise a pipe (not shown in the figures) coupled to means for evacuating (not shown in the figures) to eliminate any presence of air between the piece 32 and the mold cavity 14
  • a pipe not shown in the figures
  • means for evacuating not shown in the figures
  • the piston 30 is movably mounted in translation in the duct 12 with sealing and forms the separation between the first zone 18 and the second zone 20 of the enclosure 10.
  • the first zone 18 is filled with a first fluid and the second zone 20 is filled with a second fluid.
  • the first fluid and the second fluid are water.
  • the water contained in the first zone 18 is isolated from the water contained in the second zone 20 of the enclosure 10.
  • particles torn from the ends 26 of the electrodes 16 are stopped by the piston 30 and do not reach the piece 32.
  • the first zone 18 and the second zone 20 vary depending on the positioning of the piston 30 in the leads 12.
  • the piston 30 is for example made of a material identical to the material of the mold 4.
  • the piston 30 has a diameter identical to the diameter of the conduit 12.
  • piston 30 is movably mounted in translation in the conduit 12 thus allowing translational movements along the axis of symmetry AA 'of a first position (Figure 1) to a second position ( Figure 2).
  • sealing means such as, for example, elastic rings 38 positioned between the piston 30 and the conduit 12.
  • FIG. 3 represents a partial sectional view of the electro-hydroforming device 2 with the two elastic rings 38.
  • the latter may comprise grooves (not shown in the figures) of shape and depth adapted to receive and maintain the elastic rings 38 which form a seal between the piston 30 and the duct 12.
  • the conduit 12 comprises at least one groove (not shown in the figures) and that the piston 30 has at least one rib.
  • the groove of the duct 12 is adapted to cooperate with the rib of the piston 30.
  • the piston 30 may comprise three equi-distributed ribs around the piston 30, and the duct 12 may comprise three equi-distributed grooves, the ribs being placed opposite the grooves.
  • the piston 30 has a single degree of freedom and the forces are better distributed during the transition from the first position (Figure 1) to the second position ( Figure 2) which improves the life of the electro-hydroforming device 2.
  • the latter has a stop 40 as illustrated in FIG. 3.
  • the stop 40 is positioned on a lower part of the duct 12.
  • this stop 40 also prevents the piston 30 from exiting and / or falling out of the conduit 12 when the second zone 20 of the enclosure 10 is drained.
  • a spring (not shown in the figures) can be used.
  • the spring is for example positioned on an outer edge of a first face 42 of the piston 30 and bears on the abutment 40. The spring then makes it possible to return the piston 30 to its first position after a process step of EHF of the piece 32 placed in the mold cavity 14.
  • the passage from the first position to the second position of the piston 30 as previously described in the description is achieved by the propagation of a first wave generated by an electric arc at the level of the electrodes 16.
  • the first wave thus generated propagates in the first wave.
  • zone 18 perpendicular to the axis AA 'to the piston 30 and more precisely to a second face 44 of the piston 30.
  • the first wave presents an energy which depends inter alia on the power of the electric arc.
  • the displacement of the piston 30 in the duct 12 makes it possible to transfer almost all the energy of the first wave to the water contained in the second zone 20 giving rise to a second wave.
  • the second wave thus created propagates towards the mold cavity 14 in order to deform the piece 32 disposed thereon.
  • an electro-hydroforming device 2 with the piston 30 positioned in the duct 12 to isolate the first zone 18 of the second zone 20 enables the quality of the part 32 to be improved.
  • a relatively small amount of material is torn off from the electrodes and forms particles which fall into the fluid, in this case water. These particles once torn fall by gravity on the piston 30 and do not reach the piece 32 unlike devices of the prior art which comprise a single volume of fluid.
  • the use of the piston 30 in the duct 12 to isolate the water contained in the first zone 18 of the water contained in the second zone 20 advantageously makes it possible to reduce the time required for the filling and emptying of the water. water contained in the second zone 20.
  • the movement of the piston 30 from its first position to its second position is without resistance and can thus be achieved in a relatively short time, for example less than a millisecond, which allows to obtain a rapid deformation of the piece 32 and thus obtain a better deformation of the piece 32.
  • the second face 44 of the piston 30 may have, for example, a concave shape and the first face 42 of the piston 30 may have a convex shape (FIG. 4d). .
  • the propagation of the second wave in the lower part 8 is optimized improving the deformation quality of the part 32 after deformation.
  • the first face 42 may have a greater or smaller radius of curvature.
  • the selected radius of curvature it is possible to improve the focusing of the second wave on the part 32 in order to optimize its deformation.
  • the first face 42 and the second face 44 may also have other shapes as illustrated in Figures 4a to 4c with more or less significant curvatures to optimize the deformation of the piece 32.
  • the piston 30 may have a shape rectangular to avoid any rotations in the conduit 12.
  • first face 42 is of a shape adapted to the deformation to be made on the piece 32 and the second face 44 is of a shape adapted to the shape of the first zone 18.
  • the present invention therefore provides an electro-hydroforming device comprising a mold having an enclosure with a conduit and a piston positioned in said conduit and a mold cavity.
  • the mold proposed here is composed only of two parts facilitating its assembly and limiting its cost of manufacture.
  • the use of the piston in the conduit to separate a first zone from a second zone makes it possible to limit the volume of fluid to be emptied between two manufacturing phases and to improve the productivity gain.
  • the manufacturing time of a part corresponds to the time required to position a part on the mold cavity, fill the chamber with fluid, close the chamber and trigger an electric arc before the fluid is emptied.
  • the particles torn from the electrodes during the triggering of the electric arc do not fall on the workpiece which allows not to alter the quality.

Abstract

The invention relates to an electrohydraulic forming apparatus (2) comprising a mold (4) that has a top piece (6) and a bottom piece (8), a chamber (10) that includes a first region (18) and a second region (20), a mold impression (14) in the second region (20), and electrodes (16), the end (26) of each of which is located in the first region (18); a piston (30) is sealingly mounted in a duct (12) in such a way as to be translatable and separates the first region (18) from the second region (20) of the chamber (10).

Description

DISPOSITIF D'ÉLECTRO-HYDROFORMAGE  ELECTRO-HYDROFORMING DEVICE
La présente invention concerne un dispositif d'électro-hydroformage. The present invention relates to an electro-hydroforming device.
Les dispositifs d'électro-hydroformage sont de plus en plus utilisés pour la réalisation de pièces mécaniques. En effet, ces dispositifs de formage permettent d'obtenir des pièces d'aspect relativement complexe tout en maîtrisant les coûts de production. Ainsi, les industries de l'automobile et de l'aéronautique par exemple utilisent de tels dispositifs. Electro-hydroforming devices are increasingly used for the production of mechanical parts. Indeed, these forming devices make it possible to obtain parts of relatively complex appearance while controlling production costs. For example, the automotive and aerospace industries use such devices.
Un procédé d'hydroformage est un procédé de fabrication par déformation. Il permet la déformation plastique d'une pièce en métal d'une épaisseur relativement faible. Pour réaliser cette déformation, on utilise un fluide qui, lorsqu'il est mis sous pression, permet la déformation de ladite pièce sur un moule. Plusieurs techniques sont utilisées pour mettre le fluide sous pression.  A hydroforming process is a process of manufacture by deformation. It allows the plastic deformation of a metal part of a relatively small thickness. To achieve this deformation, a fluid is used which, when pressurized, allows the deformation of said piece on a mold. Several techniques are used to pressurize the fluid.
Un des procédés utilisés est un procédé dit par électro-hydroformage. Ce procédé repose sur le principe d'une décharge électrique dans le fluide stocké dans une cuve. La quantité d'énergie électrique libérée engendre une onde dont la propagation dans le fluide est très rapide et permet la déformation plastique de la pièce mécanique contre le moule. Pour ce faire, des électrodes positionnées dans le fluide libérèrent une charge électrique stockée dans des capacités de stockage d'énergie.  One of the processes used is a so-called electro-hydroforming process. This process is based on the principle of an electric discharge in the fluid stored in a tank. The amount of electrical energy released generates a wave whose propagation in the fluid is very fast and allows the plastic deformation of the mechanical part against the mold. To do this, electrodes positioned in the fluid released an electric charge stored in energy storage capacities.
Pour réaliser cette déformation, une quantité non négligeable d'eau est nécessaire. En effet, la déformation de la pièce est proportionnelle au volume d'eau déplacée lors de l'explosion générée par l'arc électrique. De plus, une étape de vidange de la cuve est nécessaire après chaque explosion pour récupérer la pièce formée. Ainsi, de tels dispositifs sont généralement préférés pour la fabrication de pièce en petites séries.  To achieve this deformation, a significant amount of water is needed. Indeed, the deformation of the part is proportional to the volume of water displaced during the explosion generated by the electric arc. In addition, a step of emptying the tank is necessary after each explosion to recover the formed part. Thus, such devices are generally preferred for the manufacture of parts in small series.
Cependant, la génération d'arcs électriques engendre l'arrachement de matière au niveau des électrodes et provoque l'apparition de petites particules qui tombent par gravité sur la pièce positionnée au fond du moule. Ces particules provoquent alors des défauts dans la pièce déformée.  However, the generation of electric arcs causes material to tear out at the electrodes and causes the appearance of small particles that fall by gravity onto the part positioned at the bottom of the mold. These particles then cause defects in the deformed part.
Le brevet US7493787 décrit un dispositif d'électro-hydroformage dans lequel une membrane est utilisée pour retenir deux volumes de liquide. Un dispositif adapté pour générer une impulsion haute tension est couplé à des électrodes pour créer une onde de choc dans l'un des volumes de liquide. L'onde de choc ainsi générée est transférée à travers la membrane à l'autre volume de liquide permettant de déformer une pièce contre un moule. Grâce à l'utilisation de la membrane séparant les deux volumes de liquide, seulement le volume de liquide dans lequel est placée la pièce à déformer est à vidanger lors d'un changement de pièce, ce qui améliore la productivité. En outre, la pièce à former est protégée des particules provenant de l'usure des électrodes. Cependant, un tel dispositif est de conception relativement complexe car composé d'au moins trois parties. De plus, la solidité de la membrane affecte directement la fiabilité du dispositif. De surcroit, l'utilisation de la membrane ne permet qu'une transmission simple de l'onde de choc. US Pat. No. 7,437,787 discloses an electro-hydroforming device in which a membrane is used to retain two volumes of liquid. A device adapted to generate a high voltage pulse is coupled to electrodes to create a shock wave in one of the liquid volumes. The shock wave thus generated is transferred through the membrane to the other volume of liquid for deforming a piece against a mold. Thanks to the use of the membrane separating the two volumes of liquid, only the volume of liquid in which the part to be deformed is to be emptied during a change of room, which improves productivity. In addition, the workpiece is protected from particles from electrode wear. However, such a device is of relatively complex design because composed of at least three parts. In addition, the strength of the membrane directly affects the reliability of the device. In addition, the use of the membrane allows only a simple transmission of the shock wave.
La présente invention a alors pour but de fournir un dispositif d'électro- hydroformage de conception relativement simple c'est-à-dire ne comprenant de préférence que deux parties avec une fiabilité améliorée par rapport aux dispositifs de l'art antérieur. De plus, la présente invention fournit avantageusement un dispositif d'électro-hydroformage ayant un coût de fabrication maîtrisé tout en respectant les normes en vigueur. Avantageusement, la pièce à former est protégée des particules provenant de l'usure des électrodes ce qui permet d'obtenir des pièces avec un état de surface souhaité.  The present invention therefore aims to provide an electro-hydroforming device of relatively simple design that is to say preferably comprising only two parts with improved reliability compared to devices of the prior art. In addition, the present invention advantageously provides an electro-hydroforming device having a controlled manufacturing cost while complying with the standards in force. Advantageously, the part to be formed is protected from the particles resulting from the wear of the electrodes, which makes it possible to obtain parts with a desired surface state.
A cet effet, la présente invention propose un dispositif d'électro- hydroformage comportant un moule avec une partie supérieure et une partie inférieure, une enceinte présentant une première zone, une seconde zone, une empreinte de moule positionnée dans la seconde zone et des électrodes présentant des extrémités d'électrodes positionnées dans la première zone, caractérisé en ce qu'un piston est monté mobile en translation dans un conduit avec étanchéité et sépare la première zone de la seconde zone de l'enceinte.  For this purpose, the present invention proposes an electro-hydroforming device comprising a mold with an upper part and a lower part, an enclosure having a first zone, a second zone, a mold cavity positioned in the second zone and electrodes. having electrode ends positioned in the first zone, characterized in that a piston is movably mounted in translation in a sealed conduit and separates the first zone from the second zone of the enclosure.
Grâce à l'utilisation du piston, la fiabilité du dispositif d'électro- hydroformage est améliorée. De plus, la productivité est également améliorée car il n'est pas nécessaire de vidanger la totalité du liquide contenu dans le moule du dispositif d'électro-hydroformage. Pour éviter un potentiel risque de blocage du piston dans le conduit, le piston peut présenter des premiers moyens de guidage complémentaires de seconds moyens de guidage du conduit. Thanks to the use of the piston, the reliability of the electroforming device is improved. In addition, the productivity is also improved because it is not necessary to drain all the liquid contained in the mold of the electro-hydroforming device. To avoid a potential risk of blocking the piston in the conduit, the piston may have first complementary guide means second guide means of the conduit.
Dans un exemple de réalisation, les moyens de guidage présentent trois nervures permettant de limiter à un les degrés de liberté du piston.  In an exemplary embodiment, the guide means have three ribs for limiting to one the degrees of freedom of the piston.
En variante, les seconds moyens de guidage présentent trois rainures permettant ainsi d'optimiser des déplacements en translation du piston dans le conduit.  In a variant, the second guide means have three grooves, thus making it possible to optimize displacements in translation of the piston in the conduit.
Pour optimiser la déformation d'une pièce positionnée sur l'empreinte de moule, le piston présente une première face ayant une forme plane et dirigée vers l'empreinte de moule.  To optimize the deformation of a part positioned on the mold cavity, the piston has a first face having a flat shape and directed towards the mold cavity.
Dans une variante, le piston peut présenter une première face ayant une forme choisie parmi l'ensemble des formes concaves et convexes et dirigée vers l'empreinte de moule.  In a variant, the piston may have a first face having a shape selected from the set of concave and convex shapes and directed towards the mold cavity.
Pour optimiser le déplacement du piston dans l'enceinte, le piston présente une seconde face adaptée à la forme de l'enceinte et dirigée vers la première zone.  To optimize the movement of the piston in the chamber, the piston has a second face adapted to the shape of the chamber and directed towards the first zone.
Dans une variante, le piston présente par exemple une seconde face ayant une forme choisie parmi l'ensemble des formes concaves et convexes et dirigée vers la première zone.  In a variant, the piston has for example a second face having a shape selected from the set of concave and convex shapes and directed towards the first zone.
Pour éviter que le piston tombe dans la partie inférieure du moule, le conduit peut présenter une butée adaptée pour maintenir le piston. Dans cet un exemple de réalisation, un ressort peut être positionné entre le piston et la butée permettant d'améliorer la reproductibilité des détails sur des pièces à déformer. En effet, grâce à la présence du ressort, le piston est ramené à une altitude déterminée et identique après chaque vidange du moule.  To prevent the piston from falling into the lower part of the mold, the conduit may have a stop adapted to hold the piston. In this embodiment, a spring can be positioned between the piston and the abutment to improve the reproducibility of details on parts to be deformed. Indeed, thanks to the presence of the spring, the piston is reduced to a determined altitude and identical after each emptying of the mold.
Des détails et avantages de la présente invention apparaîtront mieux de la description qui suit, faite en référence au dessin schématique annexé sur lequel :  Details and advantages of the present invention will become more apparent from the description which follows, given with reference to the appended schematic drawing in which:
La figure 1 est une vue schématique simplifiée en coupe transversale d'un dispositif d'électro-hydroformage selon la présente invention,  FIG. 1 is a schematic cross-sectional schematic view of an electro-hydroforming device according to the present invention,
La figure 2 est une vue schématique simplifiée correspondant à la figure 1 dans une autre position, FIG. 2 is a simplified schematic view corresponding to the figure 1 in another position,
La figure 3 est une vue schématique agrandie et simplifiée d'un détail de réalisation d'un autre mode de réalisation de l'invention, et  FIG. 3 is an enlarged and simplified schematic view of a detail of embodiment of another embodiment of the invention, and
La figure 4 représente différentes formes de pistons.  Figure 4 shows different forms of pistons.
La figure 1 est une représentation schématique d'un dispositif d'électro-hydroformage 2 comportant un moule 4 présentant une partie supérieure 6, une partie inférieure 8, une enceinte 10, un conduit 12, une empreinte de moule 14 positionnée dans la partie inférieure 8 et des électrodes 16.  FIG. 1 is a schematic representation of an electro-hydroforming device 2 comprising a mold 4 having an upper part 6, a lower part 8, an enclosure 10, a conduit 12, a mold cavity 14 positioned in the lower part. 8 and electrodes 16.
Un tel dispositif d'électro-hydroformage 2 peut être disposé sur un bâti Such an electro-hydroforming device 2 can be arranged on a frame
(non représenté sur les figures) réalisé en un métal ou en un alliage métallique comme par exemple en acier trempé. (Not shown in the figures) made of a metal or a metal alloy such as hardened steel.
La partie supérieure 6 du moule 4 est dans l'exemple de réalisation illustré au dessin placée au-dessus de la partie inférieure 8 du moule 4. La partie inférieure 8 est fixée à la partie supérieure 6 à l'aide par exemple de moyens de serrage (non représentés sur les figures). Préférentiellement, le moule 4 (comprenant la partie supérieure 6 et la partie inférieure 8) est composé d'un matériau à forte densité comme par exemple un métal ou un alliage métallique.  The upper part 6 of the mold 4 is in the embodiment shown in the drawing placed above the lower part 8 of the mold 4. The lower part 8 is fixed to the upper part 6 by means of, for example, tightening (not shown in the figures). Preferably, the mold 4 (comprising the upper part 6 and the lower part 8) is composed of a high density material such as a metal or a metal alloy.
L'enceinte 10 présente une première zone 18, une seconde zone 20 et le conduit 12. Comme illustré à la figure 1 , l'enceinte 10 présente une première paroi 22 ayant une forme de révolution par rapport à un axe A-A' et est par exemple de forme cylindrique avec un diamètre déterminé.  The enclosure 10 has a first zone 18, a second zone 20 and the conduit 12. As illustrated in FIG. 1, the enclosure 10 has a first wall 22 having a shape of revolution with respect to an axis AA 'and is example of cylindrical shape with a determined diameter.
L'enceinte 10 présente également une seconde paroi 24 de forme tronconique raccordée à d'une part la première paroi 22 et d'autre part au conduit 12.  The enclosure 10 also has a second wall 24 of frustoconical shape connected to the first wall 22 and the other to the conduit 12.
L'enceinte 10 est également adaptée pour recevoir dans la première zone 18 des extrémités 26 des électrodes 16. Les électrodes 16 sont des électrodes haute tension (plusieurs dizaines de kV). Celles-ci sont ici maintenues perpendiculairement à l'axe de révolution A-A' (figure 1 ). Afin d'isoler les électrodes 16 du moule 4 un manchon isolant 28 est utilisé.  The chamber 10 is also adapted to receive in the first zone 18 of the ends 26 of the electrodes 16. The electrodes 16 are high voltage electrodes (several tens of kV). These are here maintained perpendicular to the axis of revolution A-A '(Figure 1). In order to isolate the electrodes 16 from the mold 4, an insulating sleeve 28 is used.
Les électrodes 16 présentent également un espace inter-électrodes réglable et modifiable qui permet de maîtriser un déclenchement d'un arc électrique entre celles-ci. The electrodes 16 also have an inter-electrode gap adjustable and modifiable which makes it possible to control a tripping of an electric arc between them.
Il est utilisé un dispositif de stockage électrique (non représenté sur les figures) adapté pour stocker une quantité d'énergie électrique suffisante à la génération d'au moins un arc électrique entre les électrodes 16. Afin de maîtriser la quantité d'énergie électrique délivrée par le dispositif de stockage électrique sur les électrodes 16, un générateur d'impulsions (non représenté sur les figures) est couplé au dispositif de stockage d'énergie. Le générateur d'impulsions ainsi que le dispositif de stockage électrique étant connus de l'homme de l'art, ils ne sont pas présentés dans la présente description.  It is used an electrical storage device (not shown in the figures) adapted to store a sufficient amount of electrical energy to generate at least one electric arc between the electrodes 16. In order to control the amount of electrical energy delivered by the electrical storage device on the electrodes 16, a pulse generator (not shown in the figures) is coupled to the energy storage device. The pulse generator and the electrical storage device being known to those skilled in the art, they are not presented in the present description.
Dans un mode de réalisation préféré, le conduit 12 présente une forme circulaire cylindrique et présente une longueur déterminée suffisante pour permettre des déplacements d'un piston 30 correspondant à la déformation à apporter à une pièce placée face à l'empreinte de moule 14. Le conduit 12 est également adapté à l'empreinte de moule 14.  In a preferred embodiment, the duct 12 has a cylindrical circular shape and has a determined length sufficient to allow displacements of a piston 30 corresponding to the deformation to be made to a part placed facing the mold cavity 14. duct 12 is also adapted to the mold cavity 14.
La partie inférieure 8 reçoit l'empreinte de moule 14 qui définit la forme finale à donner à la pièce 32 que l'on souhaite réaliser par Electro-Hydro- Formage (EHF). L'empreinte de moule 14 peut présenter en fonction de la complexité de la forme de la pièce 32 à déformer un grand facteur de forme avec des détails d'une grande précision.  The lower part 8 receives the mold cavity 14 which defines the final shape to be given to the part 32 that it is desired to achieve by Electro-Hydro-Forming (EHF). The mold cavity 14 may have, depending on the complexity of the shape of the part 32 to deform a large form factor with details of great accuracy.
Également, la partie inférieure 8 peut comporter une canalisation (non représentée sur les figures) couplée à des moyens pour faire le vide (non représentés sur les figures) pour supprimer toute présence d'air entre la pièce 32 et l'empreinte de moule 14. Ainsi, pendant un procédé de formage de la pièce 32, aucune contre réaction (provoquée par la présence d'air entre la pièce 26 et l'empreinte de moule 14) ne s'oppose à la déformation de la pièce 32.  Also, the lower portion 8 may comprise a pipe (not shown in the figures) coupled to means for evacuating (not shown in the figures) to eliminate any presence of air between the piece 32 and the mold cavity 14 Thus, during a forming process of the piece 32, no counter-reaction (caused by the presence of air between the piece 26 and the mold cavity 14) opposes the deformation of the piece 32.
Le piston 30 est monté mobile en translation dans le conduit 12 avec étanchéité et forme la séparation entre la première zone 18 et la seconde zone 20 de l'enceinte 10. La première zone 18 est remplie d'un premier fluide et la seconde zone 20 est remplie d'un second fluide.  The piston 30 is movably mounted in translation in the duct 12 with sealing and forms the separation between the first zone 18 and the second zone 20 of the enclosure 10. The first zone 18 is filled with a first fluid and the second zone 20 is filled with a second fluid.
Dans un mode de réalisation préféré considéré ici, le premier fluide et le second fluide sont de l'eau. Avantageusement, grâce à la présence du piston 30 dans le conduit 12, l'eau contenue dans la première zone 18 est isolée de l'eau contenue dans la seconde zone 20 de l'enceinte 10. Ainsi, des particules arrachées des extrémités 26 des électrodes 16 sont arrêtées par le piston 30 et n'atteignent pas la pièce 32. Il est à noter, comme illustré aux figures 1 et 2, que la première zone 18 et la seconde zone 20 varient en fonction du positionnement du piston 30 dans le conduit 12. In a preferred embodiment considered here, the first fluid and the second fluid are water. Advantageously, thanks to the presence of the piston 30 in the conduit 12, the water contained in the first zone 18 is isolated from the water contained in the second zone 20 of the enclosure 10. Thus, particles torn from the ends 26 of the electrodes 16 are stopped by the piston 30 and do not reach the piece 32. It should be noted, as illustrated in Figures 1 and 2, that the first zone 18 and the second zone 20 vary depending on the positioning of the piston 30 in the leads 12.
Le piston 30 est par exemple en un matériau identique au matériau du moule 4. Avantageusement, afin d'assurer l'étanchéité entre la première zone 18 et la seconde zone 20, le piston 30 présente un diamètre identique au diamètre du conduit 12. Le piston 30 est monté mobile en translation dans le conduit 12 permettant ainsi des mouvements en translation selon l'axe de symétrie A-A' d'une première position (figure 1 ) à une seconde position (figure 2).  The piston 30 is for example made of a material identical to the material of the mold 4. Advantageously, in order to ensure the seal between the first zone 18 and the second zone 20, the piston 30 has a diameter identical to the diameter of the conduit 12. piston 30 is movably mounted in translation in the conduit 12 thus allowing translational movements along the axis of symmetry AA 'of a first position (Figure 1) to a second position (Figure 2).
Pour optimiser l'étanchéité entre la première zone 18 et la seconde zone 20, il peut être utilisé des moyens d'étanchéité comme par exemple des anneaux élastiques 38 positionnés entre le piston 30 et le conduit 12.  To optimize the seal between the first zone 18 and the second zone 20, it is possible to use sealing means such as, for example, elastic rings 38 positioned between the piston 30 and the conduit 12.
La figure 3 représente une vue partielle en coupe du dispositif d'électro-hydroformage 2 avec les deux anneaux élastiques 38. Dans une variante de réalisation, pour améliorer la tenue des anneaux élastiques 38 sur le piston 30, ce dernier peut comporter des rainures (non représentées sur les figures) de forme et de profondeur adaptées pour recevoir et maintenir les anneaux élastiques 38 qui forment un joint d'étanchéité entre le piston 30 et le conduit 12.  FIG. 3 represents a partial sectional view of the electro-hydroforming device 2 with the two elastic rings 38. In an alternative embodiment, to improve the resistance of the elastic rings 38 to the piston 30, the latter may comprise grooves ( not shown in the figures) of shape and depth adapted to receive and maintain the elastic rings 38 which form a seal between the piston 30 and the duct 12.
Également, pour éviter une rotation autour de l'axe A-A' lors des mouvements de translation du piston 30 dans le conduit 12, et ainsi éviter tout risque de blocage du piston 30, il est, dans un mode de réalisation, prévu que le conduit 12 comporte au moins un rainure (non représentée sur les figures) et que le piston 30 comporte au moins une nervure. La rainure du conduit 12 est adaptée pour coopérer avec la nervure du piston 30.  Also, to avoid rotation about the axis AA 'during the translation movements of the piston 30 in the conduit 12, and thus avoid any risk of locking the piston 30, it is, in one embodiment, provided that the conduit 12 comprises at least one groove (not shown in the figures) and that the piston 30 has at least one rib. The groove of the duct 12 is adapted to cooperate with the rib of the piston 30.
Dans un souci d'amélioration de la fiabilité du dispositif d'électro- hydroformage 2, le piston 30 peut comporter trois nervures équi-réparties autour du piston 30, et le conduit 12 peut comporter trois rainures équi- réparties, les nervures étant placées en face des rainures. Ainsi, le piston 30 a un seul degré de liberté et les forces sont mieux réparties lors du passage de la première position (figure 1 ) à la seconde position (figure 2) ce qui améliore la durée de vie du dispositif d'électro-hydroformage 2. In the interest of improving the reliability of the electro-hydroforming device 2, the piston 30 may comprise three equi-distributed ribs around the piston 30, and the duct 12 may comprise three equi-distributed grooves, the ribs being placed opposite the grooves. Thus, the piston 30 has a single degree of freedom and the forces are better distributed during the transition from the first position (Figure 1) to the second position (Figure 2) which improves the life of the electro-hydroforming device 2.
Dans une variante de réalisation, pour empêcher le piston 30 de sortir du conduit 12, ce dernier présente une butée 40 comme illustré à la figure 3. Préférentiellement, la butée 40 est positionnée sur une partie basse du conduit 12. En outre, cette butée 40 permet également d'éviter que le piston 30 sorte et/ou tombe hors du conduit 12 lorsque la seconde zone 20 de l'enceinte 10 est vidangée.  In an alternative embodiment, to prevent the piston 30 from leaving the duct 12, the latter has a stop 40 as illustrated in FIG. 3. Preferably, the stop 40 is positioned on a lower part of the duct 12. In addition, this stop 40 also prevents the piston 30 from exiting and / or falling out of the conduit 12 when the second zone 20 of the enclosure 10 is drained.
Dans une variante, pour faciliter le repositionnement du piston 30, un ressort (non représenté sur les figures) peut être utilisé. Le ressort est par exemple positionné sur une bordure extérieure d'une première face 42 du piston 30 et prend appui sur la butée 40. Le ressort permet alors de ramener le piston 30 dans sa première position après une étape de procédé d'EHF de la pièce 32 placée dans l'empreinte de moule 14.  In a variant, to facilitate the repositioning of the piston 30, a spring (not shown in the figures) can be used. The spring is for example positioned on an outer edge of a first face 42 of the piston 30 and bears on the abutment 40. The spring then makes it possible to return the piston 30 to its first position after a process step of EHF of the piece 32 placed in the mold cavity 14.
Le passage de la première position à la seconde position du piston 30 comme présenté précédemment dans la description est réalisé par la propagation d'une première onde générée par un arc électrique au niveau des électrodes 16. La première onde ainsi générée se propage dans la première zone 18 perpendiculairement à l'axe A-A' vers le piston 30 et plus précisément vers une seconde face 44 du piston 30.  The passage from the first position to the second position of the piston 30 as previously described in the description is achieved by the propagation of a first wave generated by an electric arc at the level of the electrodes 16. The first wave thus generated propagates in the first wave. zone 18 perpendicular to the axis AA 'to the piston 30 and more precisely to a second face 44 of the piston 30.
La première onde présente une énergie qui dépend entre autres de la puissance de l'arc électrique. Le déplacement du piston 30 dans le conduit 12 permet de transférer presque toute l'énergie de la première onde à l'eau contenue dans la seconde zone 20 donnant naissance à une seconde onde. La seconde onde ainsi créée se propage vers l'empreinte de moule 14 afin de déformer la pièce 32 disposée sur celle-ci.  The first wave presents an energy which depends inter alia on the power of the electric arc. The displacement of the piston 30 in the duct 12 makes it possible to transfer almost all the energy of the first wave to the water contained in the second zone 20 giving rise to a second wave. The second wave thus created propagates towards the mold cavity 14 in order to deform the piece 32 disposed thereon.
Avantageusement, l'utilisation d'un dispositif d'électro-hydroformage 2 avec le piston 30 positionné dans le conduit 12 pour isoler la première zone 18 de la seconde zone 20 permet l'amélioration de la qualité de la pièce 32. En effet, lors du déclenchement de l'arc électrique au niveau des électrodes 16, une quantité relativement faible de matériau est arrachée des électrodes et forme des particules qui tombent dans le fluide, ici de l'eau. Ces particules une fois arrachées tombent par gravité sur le piston 30 et ne parviennent pas à la pièce 32 contrairement aux dispositifs de l'art antérieur qui comprennent un seul volume de fluide. Advantageously, the use of an electro-hydroforming device 2 with the piston 30 positioned in the duct 12 to isolate the first zone 18 of the second zone 20 enables the quality of the part 32 to be improved. indeed, when the electric arc is triggered at the level of the electrodes 16, a relatively small amount of material is torn off from the electrodes and forms particles which fall into the fluid, in this case water. These particles once torn fall by gravity on the piston 30 and do not reach the piece 32 unlike devices of the prior art which comprise a single volume of fluid.
De plus, l'utilisation du piston 30 dans le conduit 12 pour isoler l'eau contenue dans la première zone 18 de l'eau contenue dans la seconde zone 20 permet avantageusement, de diminuer la durée nécessaire pour le remplissage et la vidange de l'eau contenue dans la seconde zone 20.  In addition, the use of the piston 30 in the duct 12 to isolate the water contained in the first zone 18 of the water contained in the second zone 20 advantageously makes it possible to reduce the time required for the filling and emptying of the water. water contained in the second zone 20.
Ainsi, le déplacement du piston 30 de sa première position à sa seconde position se fait sans résistance et peut ainsi être réalisé dans un temps relativement court, par exemple inférieur à une milliseconde, ce qui permet d'obtenir une déformation rapide de la pièce 32 et ainsi obtenir une meilleure déformation de la pièce 32.  Thus, the movement of the piston 30 from its first position to its second position is without resistance and can thus be achieved in a relatively short time, for example less than a millisecond, which allows to obtain a rapid deformation of the piece 32 and thus obtain a better deformation of the piece 32.
Afin d'améliorer le transfert d'énergie entre la première onde et la seconde onde, la seconde face 44 du piston 30 peut présenter par exemple, une forme concave et la première face 42 du piston 30 peut présenter une forme convexe (figure 4d). Ainsi la propagation de la seconde onde dans la partie inférieure 8 est optimisée améliorant la qualité de déformation de la pièce 32 après déformation.  In order to improve the energy transfer between the first wave and the second wave, the second face 44 of the piston 30 may have, for example, a concave shape and the first face 42 of the piston 30 may have a convex shape (FIG. 4d). . Thus the propagation of the second wave in the lower part 8 is optimized improving the deformation quality of the part 32 after deformation.
Dans d'autres exemples de réalisation, comme illustré aux figures 4d à 4f, la première face 42 peut avoir un rayon de courbure plus ou moins important. Ainsi, en fonction du rayon de courbure sélectionné, il est possible d'améliorer la focalisation de la seconde onde sur la pièce 32 afin d'optimiser sa déformation.  In other exemplary embodiments, as illustrated in FIGS. 4d to 4f, the first face 42 may have a greater or smaller radius of curvature. Thus, as a function of the selected radius of curvature, it is possible to improve the focusing of the second wave on the part 32 in order to optimize its deformation.
La première face 42 et la seconde face 44 peuvent également avoir d'autres formes comme illustrées aux figures 4a à 4c avec des courbures plus ou moins importantes permettant d'optimiser la déformation de la pièce 32. Egalement, le piston 30 peut présenter une forme rectangulaire permettant d'éviter toutes rotations dans le conduit 12.  The first face 42 and the second face 44 may also have other shapes as illustrated in Figures 4a to 4c with more or less significant curvatures to optimize the deformation of the piece 32. Also, the piston 30 may have a shape rectangular to avoid any rotations in the conduit 12.
De manière plus générale, la première face 42 est de forme adaptée à la déformation à réaliser sur la pièce 32 et la seconde face 44 est de forme adaptée à la forme de la première zone 18. More generally, the first face 42 is of a shape adapted to the deformation to be made on the piece 32 and the second face 44 is of a shape adapted to the shape of the first zone 18.
La présente invention propose donc un dispositif d'électro- hydroformage comprenant un moule présentant une enceinte avec un conduit et un piston positionné dans ledit conduit ainsi qu'une empreinte de moule. Le moule proposé ici est composé seulement de deux parties facilitant son assemblage et limitant son coût de fabrication. L'utilisation du piston dans le conduit pour séparer une première zone d'une seconde zone permet de limiter le volume de fluide à vidanger entre deux phases de fabrication et d'améliorer le gain de productivité. En effet, le temps de fabrication d'une pièce correspond au temps nécessaire pour positionner une pièce sur l'empreinte de moule, remplir de fluide l'enceinte, refermer l'enceinte et déclencher un arc électrique avant la vidange du fluide. De plus, grâce à la présence de deux volumes de fluide séparés, les particules arrachées des électrodes lors du déclenchement de l'arc électrique ne tombent pas sur la pièce à former ce qui permet de ne pas en altérer la qualité.  The present invention therefore provides an electro-hydroforming device comprising a mold having an enclosure with a conduit and a piston positioned in said conduit and a mold cavity. The mold proposed here is composed only of two parts facilitating its assembly and limiting its cost of manufacture. The use of the piston in the conduit to separate a first zone from a second zone makes it possible to limit the volume of fluid to be emptied between two manufacturing phases and to improve the productivity gain. In fact, the manufacturing time of a part corresponds to the time required to position a part on the mold cavity, fill the chamber with fluid, close the chamber and trigger an electric arc before the fluid is emptied. In addition, thanks to the presence of two separate fluid volumes, the particles torn from the electrodes during the triggering of the electric arc do not fall on the workpiece which allows not to alter the quality.
La présente invention ne se limite pas aux formes de réalisation décrites ci-dessus à titre d'exemples non limitatifs et aux formes représentées sur le dessin et aux autres variantes évoquées mais elle concerne toute forme de réalisation à la portée de l'homme du métier dans le cadre des revendications ci-après.  The present invention is not limited to the embodiments described above by way of non-limiting examples and the shapes shown in the drawing and the other variants mentioned but it relates to any embodiment within the reach of the skilled person within the scope of the claims below.

Claims

REVENDICATIONS
1. Dispositif d'électro-hydroformage (2) comportant un moule (4) avec une partie supérieure (6) et une partie inférieure (8), une enceinte (10) présentant une première zone (18), une seconde zone (20), une empreinte de moule (14) positionnée dans la seconde zone (20) et des électrodes (16) présentant des extrémités d'électrodes (26) positionnées dans la première zone (18), caractérisé en ce qu'un piston (30) est monté mobile en translation dans un conduit (12) avec étanchéité et sépare la première zone (18) de la seconde zone (20) de l'enceinte (10). An electro-hydroforming device (2) comprising a mold (4) with an upper part (6) and a lower part (8), an enclosure (10) having a first zone (18), a second zone (20), ), a mold cavity (14) positioned in the second zone (20) and electrodes (16) having electrode ends (26) positioned in the first zone (18), characterized in that a piston (30) ) is movably mounted in translation in a duct (12) with sealing and separates the first zone (18) of the second zone (20) of the enclosure (10).
2. Dispositif d'électro-hydroformage (2) selon la revendication 1 , caractérisé en ce que le piston (30) présente des premiers moyens de guidage complémentaires de seconds moyens de guidage du conduit (12). 2. electro-hydroforming device (2) according to claim 1, characterized in that the piston (30) has first complementary guiding means second guide means of the conduit (12).
3. Dispositif d'électro-hydroformage (2) selon la revendication 2, caractérisé en ce que les premiers moyens de guidage présentent trois nervures. 3. electro-hydroforming device (2) according to claim 2, characterized in that the first guide means have three ribs.
4. Dispositif d'électro-hydroformage (2) selon la revendication 2 ou 3, caractérisé en ce que les seconds moyens de guidage présentent trois rainures. 4. Electro-hydroforming device (2) according to claim 2 or 3, characterized in that the second guide means have three grooves.
5. Dispositif d'électro-hydroformage (2) selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le piston (30) présente une première face (42) ayant une forme plane et dirigée vers l'empreinte de moule (14). Electro-hydroforming device (2) according to one of Claims 1 to 4, characterized in that the piston (30) has a first face (42) having a flat shape and directed towards the mold cavity. (14).
6. Dispositif d'électro-hydroformage (2) selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le piston (30) présente une première face (42) ayant une forme choisie parmi l'ensemble des formes concaves et convexes et dirigée vers l'empreinte de moule (14). 6. electro-hydroforming device (2) according to any one of claims 1 to 4, characterized in that the piston (30) has a first face (42) having a shape chosen from the set of concave shapes and convex and directed towards the mold cavity (14).
7. Dispositif d'électro-hydroformage (2) selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le piston (30) présente une seconde face (44) ayant une forme plane et dirigée vers la première zone (18). Electro-hydroforming device (2) according to one of Claims 1 to 6, characterized in that the piston (30) has a second face (44) having a flat shape and directed towards the first zone (18). ).
8. Dispositif d'électro-hydroformage (2) selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le piston (30) présente une seconde face (44) ayant une forme choisie parmi l'ensemble des formes concaves et convexes et dirigée vers la première zone (18). 8. electro-hydroforming device (2) according to any one of claims 1 to 6, characterized in that the piston (30) has a second face (44) having a shape selected from the set of concave shapes and convex and directed to the first zone (18).
9. Dispositif d'électro-hydroformage (2) selon l'une des revendications 1 à 9, caractérisé en ce que le conduit (30) présente une butée (40) adaptée pour maintenir le piston (30). 9. Electro-hydroforming device (2) according to one of claims 1 to 9, characterized in that the conduit (30) has a stop (40) adapted to maintain the piston (30).
10. Dispositif d'électro-hydroformage (2) selon l'une des revendications 1 à 9, caractérisé en ce qu'un ressort est positionné entre le piston (30) et la butée (40). 10. Electro-hydroforming device (2) according to one of claims 1 to 9, characterized in that a spring is positioned between the piston (30) and the stop (40).
EP15823172.0A 2014-12-29 2015-12-29 Electrohydraulic forming apparatus Active EP3240650B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1463412A FR3031055B1 (en) 2014-12-29 2014-12-29 ELECTRO-HYDROFORMING DEVICE
PCT/EP2015/081381 WO2016107888A1 (en) 2014-12-29 2015-12-29 Electrohydraulic forming apparatus

Publications (2)

Publication Number Publication Date
EP3240650A1 true EP3240650A1 (en) 2017-11-08
EP3240650B1 EP3240650B1 (en) 2018-09-12

Family

ID=53200045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15823172.0A Active EP3240650B1 (en) 2014-12-29 2015-12-29 Electrohydraulic forming apparatus

Country Status (6)

Country Link
US (1) US20170355007A1 (en)
EP (1) EP3240650B1 (en)
JP (1) JP6666926B2 (en)
CN (1) CN107530755B (en)
FR (1) FR3031055B1 (en)
WO (1) WO2016107888A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3054968B1 (en) * 2016-08-09 2019-01-25 Adm28 S.Ar.L TOOL, DEVICE AND METHOD FOR INDIRECT ELECTROHYDRAULIC FORMING
CN112845792B (en) * 2021-01-22 2022-12-20 三峡大学 Arc explosion hot stamping bulging method and device

Family Cites Families (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615411A (en) * 1951-03-16 1952-10-28 Walton S Clevenger Method and apparatus for hydraulic work hardening
US3267710A (en) * 1962-09-24 1966-08-23 Inoue Kiyoshi Impulsive shaping and bonding of metals and other materials
US3267780A (en) * 1965-03-25 1966-08-23 Continental Can Co Electrohydraulic impulse scoring and/or weakening of thin materials
US3376723A (en) * 1965-08-16 1968-04-09 Bolt Associates Inc Methods and apparatus for forming material by sudden impulses
US3566647A (en) * 1965-11-18 1971-03-02 Inoue K Hydroimpact,high energy-rate forming of plastically deformable bodies
SE322193B (en) * 1965-12-20 1970-04-06 Asea Ab
US3494160A (en) * 1966-06-24 1970-02-10 Tokyu Car Corp Apparatus for forming a material by means of impulsive liquid pressure
US3557590A (en) * 1968-08-27 1971-01-26 Continental Can Co Hydroelectric fluid forming device
US3647137A (en) * 1970-10-20 1972-03-07 Environment One Corp Hydraulic chamber incorporating a jet nozzle
US3796463A (en) * 1970-10-20 1974-03-12 Environment One Corp Process and apparatus for mining by hydroelectric pulsed liquid jets
US3703014A (en) * 1971-02-02 1972-11-21 Kober Ag Tiltable bearing means, especially for bridges
US4344313A (en) * 1980-01-03 1982-08-17 Chachin Viktor N Hydropunch for use in a press
JPS586732A (en) * 1981-07-03 1983-01-14 Nippon Gakki Seizo Kk Method and device for electromagnetic formation of wind instrument
US4942750A (en) * 1989-01-23 1990-07-24 Vital Force, Inc. Apparatus and method for the rapid attainment of high hydrostatic pressures and concurrent delivery to a workpiece
US5095725A (en) * 1989-05-12 1992-03-17 Fuji Electric Co., Ltd. Press and actuator using piezoelectric element
US5085068A (en) * 1991-01-16 1992-02-04 Extrude Hone Corporation Die forming metallic sheet materials
US6234205B1 (en) * 1997-07-08 2001-05-22 Cabot Technology Corporation Surgical probe adapted for smoke evacuation
IL122795A (en) * 1997-12-29 2002-02-10 Pulsar Welding Ltd Combined pulsed magnetic and pulsed discharge forming of a dish from a planar plate
DE19952104A1 (en) * 1999-10-29 2001-05-03 Schuler Smg Gmbh & Co Kg Metal sheet deforming device, access aperture of lower tool of which is part of pressure cavity of piston-cylinder unit
US20040255463A1 (en) * 2003-06-20 2004-12-23 Kiehl Mark W. Method of manufacturing a vehicle frame component by high velocity hydroforming
US7493787B2 (en) * 2006-12-11 2009-02-24 Ford Global Technologies, Llc Electro-hydraulic forming tool having two liquid volumes separated by a membrane
US7827838B2 (en) * 2008-05-05 2010-11-09 Ford Global Technologies, Llc Pulsed electro-hydraulic calibration of stamped panels
US7802457B2 (en) * 2008-05-05 2010-09-28 Ford Global Technologies, Llc Electrohydraulic forming tool and method of forming sheet metal blank with the same
US8127582B2 (en) * 2008-12-19 2012-03-06 Medtronic, Inc. High velocity forming of medical device casings

Also Published As

Publication number Publication date
US20170355007A1 (en) 2017-12-14
WO2016107888A1 (en) 2016-07-07
JP2018502723A (en) 2018-02-01
JP6666926B2 (en) 2020-03-18
FR3031055A1 (en) 2016-07-01
FR3031055B1 (en) 2017-01-27
CN107530755A (en) 2018-01-02
EP3240650B1 (en) 2018-09-12
CN107530755B (en) 2020-06-09

Similar Documents

Publication Publication Date Title
EP3068557B1 (en) Electrohydraulic forming device
EP3240649B1 (en) Chamber for electrohydraulic forming
EP0122851A1 (en) Safety fracture diaphragm with a knife for limiting the pressure of a fluid
EP2986409A2 (en) Brazing without tools
EP3240650B1 (en) Electrohydraulic forming apparatus
EP0624425A1 (en) Internal equipment for electron beam butt welding of annular workpieces, and method of use
FR2952468A1 (en) PACKAGING FOR THE TRANSPORT AND / OR STORAGE OF RADIOACTIVE MATERIALS COMPRISING RADIALLY STACKED RADIOLOGICAL PROTECTION ELEMENTS
CA2919963C (en) Electro-hydraulic forming machine for the plastic deformation of a projectile part of the wall of a workpiece to be formed
EP2931454B1 (en) Method of assembly using magnetic crimping
FR3058655B1 (en) ELECTROHYDRAULIC FORMING METHOD AND DEVICE THEREOF
EP3240648B1 (en) Electrohydraulic forming device comprising an optimised chamber
EP0061400B1 (en) Method and device for the vacuum tight closure and opening of a container for irradiated nuclear fuel
FR2530744A1 (en) PRESSURE TANK SUCH AS PRESSURE ACCUMULATOR AND METHOD FOR MANUFACTURING SAME
EP3720626B1 (en) Methods for shaping/welding parts by means of magnetic pulse
EP3240647B1 (en) Chamber for an electrohydraulic forming device
WO2020120891A1 (en) Method for cleaning a part produced by an additive manufacturing method with at least one plug and a phase change of a cleaning product
FR2494613A1 (en) METHOD AND DEVICE FOR THE NON-REMOVABLE ASSEMBLY OF ROTATING PARTS, SUCH AS TREE ELEMENTS
EP3541545A1 (en) Method for electrohydraulic forming and associated device
EP3579990B1 (en) Electrohydraulic forming device
EP3496876A1 (en) Indirect electrohydraulic press forming tool, device and method
FR2720467A1 (en) Device allowing the rapid opening of a channel for gases under high pressure.
CH631796A5 (en) PRESSURE TANK.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20170622

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20180529

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602015016350

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1039930

Country of ref document: AT

Kind code of ref document: T

Effective date: 20181015

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 4

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20180912

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20181212

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20181212

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20181213

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1039930

Country of ref document: AT

Kind code of ref document: T

Effective date: 20180912

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190112

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20190112

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602015016350

Country of ref document: DE

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

26N No opposition filed

Effective date: 20190613

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181229

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20181231

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181229

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181231

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20181231

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180912

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20180912

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20151229

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20231220

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20231116

Year of fee payment: 9

Ref country code: DE

Payment date: 20231208

Year of fee payment: 9