EP3027336B1 - Machine d'électro-hydroformage pour la déformation plastique d'une partie projectile de la paroi d'une pièce à former - Google Patents

Machine d'électro-hydroformage pour la déformation plastique d'une partie projectile de la paroi d'une pièce à former Download PDF

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Publication number
EP3027336B1
EP3027336B1 EP14748255.8A EP14748255A EP3027336B1 EP 3027336 B1 EP3027336 B1 EP 3027336B1 EP 14748255 A EP14748255 A EP 14748255A EP 3027336 B1 EP3027336 B1 EP 3027336B1
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EP
European Patent Office
Prior art keywords
electro
fluid
application tool
downstream
chamber
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EP14748255.8A
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German (de)
English (en)
French (fr)
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EP3027336A1 (fr
Inventor
Didier PRIEM
Guillaume RACINEUX
Prabu MANOHARAN
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Ecole Centrale de Nantes
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Ecole Centrale de Nantes
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • 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
    • 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
    • B21D26/033—Deforming tubular bodies
    • B21D26/045—Closing or sealing means
    • 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
    • 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
    • B21D26/08—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 generated by explosives, e.g. chemical explosives

Definitions

  • the present invention relates to machines and methods for plastic deformation, advantageously at high speed and at high pressure, of the wall of a workpiece by an electro-hydroforming technique.
  • Some materials have limited ductility; this is particularly the case of metals such as titanium alloys or steels with high yield strength.
  • the shaping of certain parts can be done by hydroforming machines, as described in the documents US-6,305,204 or U.S. 4,557,128 .
  • the liquid under pressure passes to the forming chamber by a small diameter channel formed in a cylindrical tool penetrating into the tube to be deformed.
  • the shaping of these materials can be achieved by high speed and high pressure forming techniques, in particular electrohydraulic forming or electro-hydroforming techniques, as described for example in the document EP-1 488 868 .
  • electro-hydroforming techniques are based on the rapid movement of a forming fluid applied to one of the faces of the wall of the part to be deformed, accompanied by a rapid increase in the pressure of this fluid (unlike the progressive rise in pressure of the hydroforming machines).
  • the forming fluid is then used as a means for stamping the workpiece to be deformed.
  • the energy required for the forming action is in the form of a shock wave within the forming fluid.
  • the present invention proposes a new electro-hydroforming machine, and a new method, capable of generating a dynamic deformation of a projectile portion of the wall of a workpiece to be formed, and particularly adapted to the implementation of shaped cylindrical tubular parts of small diameters.
  • the corresponding electro-hydroforming machine is thus intended to allow the plastic deformation of a projectile portion of the wall of a workpiece to be formed, preferably a cylindrical tubular piece, by a forming fluid intended to be applied on one face internal part of this projectile.
  • the application tool is in the form of a cylindrical tubular member which delimits the chamber intended to be filled with the forming fluid, and which has two ends: a cooperating upstream end; with the means for generating the shock wave on said forming fluid, and - a downstream end provided with a plurality of downstream orifices for the passage of said forming fluid and for propagation of the generated shock wave.
  • downstream orifices of the application tool open radially through said application tool and are distributed on the circumference of its downstream end.
  • the downstream end of the application tool preferably further comprises a cylindrical outer surface in which is formed a groove into which open the downstream orifices, said groove being intended to form a reserve of liquid facing the impression target support.
  • the application tool comprises, at or downstream orifices, means for sealing the forming fluid, in order to limit the working area of the latter;
  • the sealing means preferably comprise: - seals formed on either side of the downstream orifice (s), adapted to be interposed between said application tool and the part to be deformed, or - a flexible envelope hermetically covering the fluid or the downstream orifices of the application tool;
  • the means for generating the shock wave comprise a piston adapted to provide a pressure multiplier effect, which piston is movable in translation through an upstream orifice of the application tool, in fluid communication with the chamber of said tool, which piston has two ends: - a downstream end extending within the chamber of the application tool, and - an upstream end cooperating with means for its maneuver in translation to great speed ;
  • the piston operating means advantageously comprise an upstream enclosure in which extends the upstream end of said piston, which enclosure is adapted to receive a conductive fluid and is provided with means for generating an electric discharge in said conductive fluid capable of generating a shock wave within the latter;
  • the piston operating means comprise a magnetic chamber at which extends the upstream end of said piston which is provided with an electrically conductive member adapted to undergo magnetic forces to ensure the high speed acceleration of said piston;
  • the chamber of the application tool is further connected to means for generating an air vacuum within said chamber and to means for filling said chamber with said forming fluid.
  • the target support may be a matrix or a part intended to be crimped on the part to be deformed.
  • the present invention also relates to the tool for applying a shock wave by means of a forming fluid, for an electro-hydroforming machine as defined above.
  • the present invention also relates to a method for the plastic deformation of a projectile part of the wall of a workpiece by means of an electro-hydroforming machine as defined above, for example a tubular piece for its expansion or for its shaping.
  • the electro-hydroforming machine 1 shown schematically and in section on the figure 1 , is intended to allow the plastic deformation of a part P by a forming fluid F.
  • This electro-hydroforming machine 1 allows the implementation of forming processes at high speeds, able to push the limits of formability of materials and limit their springback.
  • the part P to be deformed is made of a material chosen from metallic materials (such as titanium alloys, high yield strength steels) or non-metallic, ductile or non-ductile materials.
  • This piece P consists, advantageously, of a cylindrical tubular piece, of longitudinal axis P ' , which has a wall P1 having an inner face P11 and an outer face P12 .
  • a "projectile" portion P13 of the wall P1 of this piece P is intended to undergo a "plastic deformation", that is to say a permanent deformation obtained by displacement of material, in this case the stamping type.
  • This plastic deformation advantageously consists of a radial expansion, also called “expansion”, of the projectile portion P13 of the part P to be deformed.
  • the forming fluid F is intended to be applied at high speed and at high pressure to the inner face P11 of the projectile portion P13 of the wall P1 to be deformed.
  • the forming fluid F advantageously consists of a liquid, and preferably water.
  • the "high speed” envisaged is, without being in any way limiting, between 100 and 150 m / second; the “high pressure” indicated is advantageously, again without being in any way limiting, of several hundred bars, or even exceeds the thousand bars.
  • the application tool 4 allows a local application of a shock wave on the projectile portion P13 , via the forming fluid F , advantageously to cause the radial expansion of a annular band constituting the cylindrical tubular piece.
  • the term “inner face” of the projectile portion P13 the face against which is applied the forming fluid F ; “outer face” of the projectile portion P13 is understood to mean the opposite face which is intended to be pressed into the target impression and to be wedged with it.
  • the target support 2 advantageously consists of a matrix, possibly intended to receive a part to be dug out (or part to be crimped).
  • This target support 2 comprises a cylindrical through housing 21 having an annular recess 22 intended to come opposite the outer face P12 of the projectile portion P13 of the wall P1 to be deformed.
  • this cylindrical housing through 21 advantageously corresponds, with the clearance, the outer diameter of the part P to deform, defined by the outer face P12 of its wall P1 .
  • the profile of the cavity 22 is suitably adapted, in particular according to the desired final shape for the projectile portion P13 of the wall P1 to be deformed.
  • the application tool 4 consists of a tubular cylindrical member which defines a longitudinal axis 4 'intended to extend coaxially, or at least approximately coaxially, with respect to the longitudinal axis P ' of the part P to be deformed and the longitudinal axis of the cylindrical housing 21 passing through.
  • the diameter of the outer cylindrical surface 43 b of the applicator tool 4 corresponds advantageously to the clearance, to the diameter of the inner face P1 P11 of the wall to be deformed.
  • the diameter of the outer cylindrical surface 43 b is for example between a few millimeters (for example 2-20 mm) and a few centimeters (for example 2 to 5 cm).
  • the downstream orifices 42 of the application tool 4 are intended to open facing the projectile portion P13 of the wall P1 to deform and facing the cavity 22 of the matrix 2.
  • downstream orifices 42 are adapted to allow the passage of the forming fluid F from the aforementioned chamber 44, in particular to ensure the optimal propagation of the shock wave generated in this forming fluid F towards the footprint 22 of the target support 2.
  • downstream orifices 42 are opening, that is to say that they are, on the one hand, in fluid communication with the chamber 44 on the inner side and, on the other hand, opening at the level of the surface external device 43 b of the application tool 4.
  • downstream orifices 42 are evenly distributed around the circumference of the application tool 4, and they are spaced apart by a constant angular sector. These downstream orifices 42 are at least two in number; they are here four in number, spaced two by two by an angular sector of the order of 90 °.
  • Each downstream orifice 42 extends radially, that is to say on a radial axis passing through the axis 4 'of the application tool 4.
  • downstream orifices 42 each still have the shape of an elongated slot whose longitudinal axis extends parallel to the longitudinal axis 4 'of the application tool 4.
  • the length of these orifices 42, along the longitudinal axis 4 ', corresponds, at least approximately, to the width of the projectile portion P13 along the longitudinal axis P ' of the wall P1 or to the width of the cavity 22 of the target support 2.
  • the width of these openings 42 is adapted to occupy a maximum portion of the circumference of the downstream end 41 b of the applicator tool 4 while maintaining a structure capable of withstanding the mechanical forces subject.
  • the outer surface 43 b of the applicator tool 4 comprises, from its downstream side end 41b, a groove 46 in which the open downstream 42 ports.
  • This structure allows a homogeneous distribution of the forming pressure over the entire inner circumference of the projectile portion P13 to deform in radial expansion.
  • this groove 46 of generally annular shape, extends over the entire circumference of the outer surface 43b of the application tool 4 and opens out towards the periphery (opposite its longitudinal axis 4 ') .
  • the length of this groove 46 is equal to, or at least approximately equal to, the length of the downstream orifices 42.
  • the length of this groove 46, along the longitudinal axis 4 ', corresponds, at least approximately, to the width of the part P13 projectile along the longitudinal axis P 'of the wall P1 or the width of the cavity 22 of the target support 2.
  • Its depth is a few tenths of a millimeter, for example between 0.3 mm and 0.7 millimeters.
  • This groove 46 is thus intended to form, with the inner surface P11 of the projectile portion P13 of the wall P1 to be deformed, a reserve of liquid R opposite the cavity 22 of the matrix 2.
  • the application tool 4 further comprises, at its downstream orifices 42, means 47 for sealing the forming fluid F at its peripheral surface 43 b .
  • sealing means 47 contribute to limiting the working area of this forming fluid F , on either side of the downstream orifices 42 and the groove 46.
  • These sealing means 47 here comprise two O-rings 47a that are placed on either side of the downstream orifices 42 and the groove 46, around the outer surface 43 b of the applicator tool 4.
  • seals 47 a are thus located, for one upstream and the other downstream, with respect to these downstream orifices 42 and the groove 46.
  • seals 47a are adapted to come between the outer surface 43 b of the applicator tool 4 and the inner face P1 P11 of the wall to be deformed, to participate in defining the limits upstream / downstream of the reserve of liquid R.
  • the chamber 44 of the applicator tool 4 extends over a portion downstream of the applicator tool 4, the downstream side of its end 41b.
  • This chamber 44 has a generally cylindrical shape, having a diameter d defined by the inner surface 43 a of the application tool 4.
  • this chamber 44 has a diameter of between a few millimeters and a few centimeters and a volume large enough to obtain the desired deformation.
  • this chamber 44 opens radially through the downstream orifices 42 mentioned above.
  • this chamber 44 opens through an upstream orifice 48 arranged coaxially with the longitudinal axis 4 'of the application tool 4.
  • This upstream orifice 48 is in fluid communication with the chamber 44; and it is connected to the means 3 for generating the shock wave in the forming fluid F contained in the chamber 44.
  • shock wave is meant in particular, without being limited by any theory, a wave associated with a sudden transition; in particular, it takes the form of a wave of high pressure.
  • shock wave is still meant a shock movement (displacement, pressure or other variable) associated with the propagation of the shock through the forming fluid F.
  • This shock wave is advantageously characterized by a wavefront in which the pressure increases abruptly to a relatively large value.
  • the means 3 for generating the shock wave in the forming fluid F here comprise a piston 31 movable in translation through the upstream orifice 48 of the chamber 44, in a direction oriented coaxially with its longitudinal axis 4 '.
  • the piston 31 extends along a stretch upstream of the applicator tool 4 on the side of its upstream end 41 a.
  • the stroke of the piston 31 is greater than the volume of liquid to be displaced to allow the deformation; and its projection speed is between 100 and 150 m / s.
  • This piston 31 is advantageously of the pressure-multiplying effect type.
  • pressure intensifier is meant a pressure in the chamber 44 of the applicator tool 4 which is equal to at least twice the pressure generated at the upstream end 31b of the piston 31.
  • pressure multiplier effect is advantageously understood to mean a multiple of the order of 5 to 15 (e.g. about 10) between the pressure on the upstream end 31b of the piston 31 and the pressure exerted on its downstream end 31 a .
  • the downstream end 31a of the piston 31 has a front surface which is of the order of 5 to 15 (e.g. about 10) times lower than the end face of the upstream end 31b of the piston 31.
  • the section ratio of this piston 31 allows to perform a pressure multiplication.
  • the diameter of the end face of the downstream end 31 a of the piston 31 is between 10 mm and 20 mm and the diameter of the end face of the upstream end 31b of the piston 31 is between 50 mm and 70 mm.
  • the pressure is advantageously multiplied by a factor of the order of 5 to 15 (for example of the order of 10) from upstream to downstream.
  • This piston thus uses a principle of "intensification" of the fluid pressure.
  • the upstream end 31b of the piston 31 form a piston head, and its downstream end 31 to form a rod extending within the chamber 44.
  • the diameter of the downstream end 31a of the piston 31, forming rod is advantageously identical, to within the clearance, to the diameter of the chamber 44.
  • the part P to be formed is suitably reported in the matrix 2, by positioning in its through housing 21.
  • the projectile portion P13 of its wall P1 is suitably arranged, axially, opposite the cavity 22 of this matrix 2.
  • the application tool 4 is then introduced into this part P , so that its downstream orifices 42 are arranged opposite this same cavity 22 of the matrix 2.
  • This application tool 4 is for that introduced in translation through the free end of the part P , coaxially with respect to each other.
  • the seal between the downstream end 41 b of the applicator tool 4 and the wall P1 to be deformed is provided by the sealing means 47 which are interposed between the outer surface 43 b of the tool application 4 and the inner surface P11 of this wall P1 .
  • the application tool 4 is then suitably filled with the forming fluid F , so that the latter completely fills the chamber 44, extending within the downstream orifices 42, and fills its groove 46 to form the reserve of R. liquid
  • the means 32 for the translational movement of the piston 31 are then implemented, so as to cause its projection from a retracted upstream position (upper half of the figure 1 ) to an extended downstream position (lower half of the figure 1 ).
  • the downstream end 31a of the piston 31 is thus moved at high speed towards the downstream orifice 42 of the applicator tool 4, which generates a shock wave in the forming fluid F present within the chamber 44 of the application tool 4.
  • This shock wave propagates in the forming fluid F to the liquid reservoir R.
  • the forming fluid F thus exerts a dynamic radial pressure on the inner face P11 of the projectile portion P13 to be deformed, which causes its radial expansion at high speed until it fits the impression 22 of the die 2 (see half lower of the figure 1 ).
  • the application tool 4 is extracted from the deformed piece P , which is itself extracted from the die 2.
  • the electro-hydroforming machine 1 illustrated by the figures 2 and 3 , is of the type described above in relation to the figure 1 .
  • It comprises the target support (not shown), the means 3 for generating the shock wave within the forming fluid F , and the tool 4 for the application of the forming fluid F on the projectile part of the wall to deform (not shown).
  • the application tool 4 is in the form of a cylindrical elongated tubular body having two ends: - the upstream end 41a which cooperates with the means 3 for generating the shock wave on the forming fluid F, and - the downstream end 41 b provided with several holes 42 downstream, for passing the F forming fluid and the spread of the wave shock generated in the latter.
  • This application tool 4 further comprises the two cylindrical surfaces: - the inner surface 43a defining the chamber 44 for containing the forming fluid F, and - the outer surface 43 b, intended to come next to the cavity of the matrix and the inner face of the wall to be deformed.
  • the chamber 44 of the application tool 4 opens, downstream, through the downstream orifices 42 extending into the bottom of the groove 46 intended to define a reserve of liquid R and, upstream, by an upstream orifice 48 to the level of which extends the piston 31.
  • This chamber 44 of the applicator tool 4 is here provided with two through conduits 6, one upper 6a and a lower 6b ( figure 3 ).
  • These two through conduits 6a, 6b are arranged coaxially with respect to one another, perpendicular to and on either side of the longitudinal axis 4 'of the applicator tool 4.
  • the duct opening upper 6a is intended to be connected to means for generating a primary air vacuum within the chamber 44, namely, for example between 1 and 1000 Pa; and lower duct opening 6b is intended to be connected to means for filling and emptying of the chamber 44 with the forming fluid F.
  • the function of these means is to avoid the creation of a compressible air mattress in the chamber 44 during the generation of the shock wave by the dedicated means 3.
  • the means 3 for generating the shock wave comprise the piston 31 whose operating means 32 here consist of so-called “hydroelectric” operating means.
  • hydroelectric maneuvering means means a device for projecting the piston by means of a propulsion force generated by a shock wave produced in a conductive fluid by a suitable electric discharge.
  • These means of maneuver 32 consist here of an enclosure 32 defining a chamber 32 b within which extend a pair of electrodes 32 c and the upstream end 31b of the piston 31.
  • the two electrodes 32 c are intended to drive the electric discharge in a driver fluid filling the chamber C 32 b supra.
  • the two electrodes 32c are disposed on either side of the enclosure 32; they are at a distance and facing each other, this here along a vertical or substantially vertical axis.
  • These two electrodes 32c can be connected by a fusible connecting wire (not shown), to control the shock wave initiation time (in particular according to its melting time).
  • the enclosure 32 is advantageously provided with suction ducts and air vacuum (not shown) whose function is to avoid the creation of a compressible mat of air during the electric discharge.
  • the piston 31 is again adapted to provide a multiplier pressure effect.
  • pressure multiplier effect is advantageously understood to mean a multiple of the order of 5 to 15 (e.g. about 10) between the pressure exerted by the fluid driver C on the upstream end 31b of the piston 31 and the pressure in the forming fluid F by its downstream end 31 a.
  • an intense electric discharge (several tens of kilovolts and kilo amperes) is released in a very short time (from a few microseconds to several hundred microseconds) between the two electrodes 32 c .
  • This high electrical current passes through the conductive liquid ⁇ located in the enclosure 32 b, generating a shock wave which primary dynamically raises the pressure of this conductive liquid C.
  • the primary shock wave produced exerts a thrust on the upstream end 31b of the piston 31 which is projected in translation downstream.
  • This displacement generates a final shock wave within the forming fluid F of the chamber 44 of the application tool 4.
  • this final shock wave propagates in the forming fluid F to the groove 46 to cause the expansion of the piece P at high speed, until it marries the imprint of the matrix (here not shown).
  • the figure 4 illustrates an implementation of the application tool 4 according to the figure 3 for expanding the projectile portion P13 of the workpiece P into a die 2.
  • this projectile portion P13 is pressed against the cavity 22 of this matrix 2 under the effect of the shock wave generated in the forming fluid F (as illustrated in the lower half of the figure 4 ).
  • the figure 5 illustrates the implementation of the implementation tool 4 of the figure 3 , for the expansion of the projectile portion P13 of the piece P in a ring 7 reported by fitting.
  • the ring 7, forming here the target support consists for example of a metal part, for example of the ferrule type. It is maintained in the imprint 22 of the matrix 2.
  • This ring 7 has an inner surface 71 forming the impression against which the projectile portion P13 of the piece P is intended to be applied during its shaping.
  • the projectile portion P13 of the piece P to be formed is pressed against the impression 71 of the ring 7 attached, under the effect of the shock wave generated in the forming fluid F (as shown in FIG. the lower half of the figure 5 ).
  • This ring 7 is thus sandwiched between the projectile portion P13 of the piece P to be formed and the cavity 22 of the matrix 2. It is then crimped onto the piece P by expanding its projectile portion P13 .
  • the figure 6 illustrates the application tool 4 according to the figures 2 and 3 , in which its sealing means 47 here consist of a flexible envelope 47 b .
  • the flexible envelope 47 b fluid tight, consists here of a sort of sleeve made of a material such as polyurethane.
  • This flexible envelope 47 b covers a downstream portion of the outer surface 43 b of the applicator tool 4.
  • the flexible envelope 47 b extends opposite the orifices 42 downstream of the applicator tool 4, closing the peripheral opening of the groove 46 to radially delimit the subject A.
  • This flexible envelope 47 b is advantageously made integral with the tool application 4 by means of two clamps 47 c formed on either side of the downstream orifices 42 and the groove 46.
  • This embodiment has the advantage of delimiting the reserve R, and thus avoiding any flow of forming liquid F. As a result, the vacuum and filling operations are not repeated at each forming operation.
  • Such a tool 4, with the flexible casing 47 b, is implemented in a manner identical to that described above in relation to Figures 1 to 5 .
  • the figure 7 still illustrates an electro-hydroforming machine 1 of the type described above.
  • It comprises the target support (not shown), the means 3 for generating the shock wave within the forming fluid F , and the tool 4 for the application of the forming fluid F on the projectile part of the wall to deform (not shown).
  • the means 3 for generating the shock wave further comprise the piston 31, whose operating means 32 here consist of so-called “magnetic” means of maneuvering.
  • the "magnetic" maneuvering means 32 comprising a magnetic speaker 32 m provided with a 32 s coil, with or without a magnetic field concentrator.
  • the upstream end 31b of the piston 31 is in the magnetic enclosure 32 m.
  • This upstream end 31b here comprises a part 31 c, electrically conductive, forming a propellant which is capable of undergoing magnetic forces to ensure the acceleration of the high-speed piston 31.
  • This propellant piece 31c constitutes a solid core here for adjusting the angle of the magnetic field concentrator, without changing the coil 32 s.
  • the machining of the peripheral surface of the propeller part 31 c provides a frustoconical part diverging from upstream to downstream.
  • This propeller part 31 c has a predetermined angle ⁇ (with respect to the longitudinal axis of said propeller part 31 c) which is intended to set in motion the piston 31.
  • the axial force generated is related to the angle ⁇ of the field concentrator.
  • the coil may further consist of a spirally machined flat coil whose axis extends at least approximately coaxially with the axis of the piston; the piston facing the coil directly undergoes the force generated by the discharge of the capacitors.
  • the present invention thus provides an interesting technical solution for the radial dynamic expansion of a part, preferably a piece of radial tubular shape.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Combined Devices Of Dampers And Springs (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
EP14748255.8A 2013-08-01 2014-07-29 Machine d'électro-hydroformage pour la déformation plastique d'une partie projectile de la paroi d'une pièce à former Active EP3027336B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1357632A FR3009214B1 (fr) 2013-08-01 2013-08-01 Machine d'electro-hydroformage pour la deformation plastique d'une partie projectile de la paroi d'une piece a former
PCT/FR2014/051964 WO2015015114A1 (fr) 2013-08-01 2014-07-29 Machine d'électro-hydroformage pour la déformation plastique d'une partie projectile de la paroi d'une pièce à former

Publications (2)

Publication Number Publication Date
EP3027336A1 EP3027336A1 (fr) 2016-06-08
EP3027336B1 true EP3027336B1 (fr) 2019-11-06

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EP14748255.8A Active EP3027336B1 (fr) 2013-08-01 2014-07-29 Machine d'électro-hydroformage pour la déformation plastique d'une partie projectile de la paroi d'une pièce à former

Country Status (8)

Country Link
US (1) US10413957B2 (ko)
EP (1) EP3027336B1 (ko)
JP (1) JP6509216B2 (ko)
KR (1) KR102231542B1 (ko)
BR (1) BR112016001998A2 (ko)
CA (1) CA2919963C (ko)
FR (1) FR3009214B1 (ko)
WO (1) WO2015015114A1 (ko)

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Publication number Priority date Publication date Assignee Title
ITUA20162257A1 (it) * 2016-04-01 2017-10-01 Bertini Macch S R L Macchina per la formatura e per la sagomatura di un tubolare metallico, come un tubo
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US10413957B2 (en) 2019-09-17
FR3009214A1 (fr) 2015-02-06
KR102231542B1 (ko) 2021-03-24
BR112016001998A2 (pt) 2017-08-01
CA2919963C (fr) 2021-10-26
US20160175912A1 (en) 2016-06-23
EP3027336A1 (fr) 2016-06-08
WO2015015114A1 (fr) 2015-02-05
CA2919963A1 (fr) 2015-02-05
JP2016527084A (ja) 2016-09-08
JP6509216B2 (ja) 2019-05-08
KR20160040189A (ko) 2016-04-12
FR3009214B1 (fr) 2016-01-01

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