EP3579990B1 - Dispositif d'electrohydroformage - Google Patents

Dispositif d'electrohydroformage Download PDF

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Publication number
EP3579990B1
EP3579990B1 EP18703599.3A EP18703599A EP3579990B1 EP 3579990 B1 EP3579990 B1 EP 3579990B1 EP 18703599 A EP18703599 A EP 18703599A EP 3579990 B1 EP3579990 B1 EP 3579990B1
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EP
European Patent Office
Prior art keywords
electrode
peripheral electrode
peripheral
central electrode
electrohydroforming
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EP18703599.3A
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German (de)
English (en)
French (fr)
Other versions
EP3579990A1 (fr
Inventor
Gilles Avrillaud
Julien DEROY
Romain PECQUOIS
Pierre THOUET
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ADM28 SARL
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ADM28 SARL
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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

Definitions

  • the present invention relates to an electrohydroforming device.
  • Electrohydraulic forming deforms a blank of material against a mold by applying dynamic pressure. To this end, an electric discharge is generated between at least two electrodes placed in a chamber filled with liquid, for example water. An electric arc is then formed between the two electrodes causing a high temperature gradient and vaporization of the liquid. A pressure wave, also commonly called a “shock wave”, travels at high speed and presses the blank of material against the mold. Electrohydraulic forming is particularly advantageous in comparison with other forming processes since it allows to have a reduced springback and to obtain etching-type details and / or sharp angles and / or local elongations before breakage improved on the parts to be formed.
  • Electrohydraulic or electrohydroforming forming has drawbacks.
  • One of the disadvantages of electrohydroforming is that the electrodes wear out quickly. As a result, the distance between the electrodes increases and the electric discharge is less strong. The efficiency of electrohydroforming decreases.
  • the electrodes are replaced regularly. The replacement of the electrodes generates additional maintenance costs and involves a reduction in the production rate following a temporary immobilization of the device.
  • the document US4,068,514 describes an electrohydroforming device comprising a central electrode extending in a longitudinal direction and a peripheral electrode formed by the wall of the forming chamber surrounding the central electrode. Since the wear of the peripheral electrode is distributed over a larger area, the distance between the electrodes varies less than with a device in which two electrodes, most often conical, are placed face to face and whose active parts are therefore very localized.
  • the electrodes can therefore be used longer without the efficiency of the electrohydroforming, and in particular the pressure generated by the shock wave, being affected.
  • replacing an electrode involves changing the entire electrohydroforming chamber, which generates higher maintenance costs than for other devices of the prior art and temporary immobilization of the device to replace the electrode. longer electrode.
  • the present invention aims in particular to overcome the drawbacks of the aforementioned prior art.
  • each peripheral electrode is separate from said body.
  • the use of a peripheral electrode separate from the body partly forming the electrohydroforming chamber makes it possible to reduce the size of the peripheral electrode to be changed and the immobilization time of the device when changing electrodes. , thus reducing maintenance costs.
  • the at least one peripheral electrode protrudes from the body, allowing better control of where the discharge occurs and increasing the efficiency of electrohydroforming.
  • the at least one peripheral electrode is supported by an electrode holder.
  • an electrode holder makes it possible to reduce the size of the peripheral electrode to be changed and to simplify the replacement of the peripheral electrode.
  • the electrode holder can also act as a blank holder. A compact and easy to assemble electrohydroforming device is thus obtained.
  • the device comprises a single peripheral electrode and at least one central electrode.
  • the electrohydroforming device may include several pairs of central and peripheral electrodes associated with one or more molds. It is thus possible to produce several parts in parallel or a large part by implementing several electric discharges in parallel.
  • the electrohydroforming chamber is formed by a body and the end of the peripheral electrode.
  • the electrohydroforming chamber is then closed by the blank of material to be deformed. This embodiment is advantageous because it is easy to machine and assemble.
  • a blank of material is held between the end of the peripheral electrode and the mold.
  • a compact and easy to assemble electrohydroforming device is thus obtained.
  • the end of the peripheral electrode can comprise a shoulder in which the blank of material is housed. The peripheral electrode then acts as a blank holder and allows the blank to be held material against the mold.
  • the device comprises a blank holder arranged between the end of the peripheral electrode and the mold.
  • the device further comprises a mold support which makes it easier to change the mold depending on the part to be formed.
  • the central electrode is surrounded for part of its length by an electrical insulator.
  • the body is in electrical contact with the central electrode and further comprises an electrical insulator intended to insulate the peripheral electrode from the central electrode.
  • the body When the central electrode is surrounded over part of its length by an electrical insulator, the body is easier to machine and assemble than when the body includes the electrical insulator intended to insulate the peripheral electrode from the central electrode.
  • the body further comprises a cavity partly forming the electrohydroforming chamber and the electrical insulator at least partly forming a side wall of said cavity.
  • the electrical insulator constitutes the side wall of the cavity.
  • the insulator located on the side wall is less stressed than when it surrounds the central electrode and forms a part the bottom wall of the cavity.
  • the end of the peripheral electrode and the mold are in electrical contact and subjected to a first electrical potential, the central electrode being subjected to a second electrical potential.
  • the central electrode and the mold When the peripheral electrode and the mold are in electrical contact, optionally via a mold support and / or a blank holder, the central electrode being moreover isolated, it is easy to generate the discharge electric by connecting the central electrode or the body, if it is in electrical contact with the central electrode, to one of the terminals of a pulse voltage generator and by connecting one of the elements to the electrical contact of the peripheral electrode to the other terminal of the pulse voltage generator.
  • the design of the electrohydroforming device is therefore easier since the electrical connections with the terminals of the high-voltage pulse generator are not necessarily established at the level of the central and peripheral electrodes.
  • the figure 1A shows a first embodiment of an electrohydroforming device according to the invention.
  • the electrohydroforming device 100 comprises an electrohydroforming chamber 110, a central electrode 120 and a peripheral electrode 130.
  • the central electrode 120 extends in a longitudinal direction XX 'and has a first end 122 disposed inside the device. the electrohydroforming chamber 110.
  • the peripheral electrode 130 has an end 132 disposed at a distance from and around the end 122 of the central electrode 120.
  • the end 132 of the peripheral electrode 130 extends in a transverse plane relative to said central electrode 120, that is to say in the plane perpendicular to the axis XX '.
  • the electrohydroforming device 100 also comprises a body 140 and a mold 150.
  • the body 140 comprises an internal cavity 142 and is crossed by the central electrode 120.
  • the internal cavity 142 of the body forms, with the end 132 of the peripheral electrode 130, the electrohydroforming chamber 110.
  • the electrohydroforming chamber 110 is intended to be filled with a liquid, for example water, and is closed by a blank of material 160 to be deformed.
  • the blank of material 160 is pressed against the mold 150 and deforms against the mold 150 under the action of a shock wave propagating in the electrohydroforming chamber 110.
  • the shock wave is generated following the application. of a high voltage electrical pulse between the electrodes 120 and 130 and the generation of an electrical discharge between the electrodes.
  • the electric discharge causes the formation of an electric arc, an increase in temperature and the vaporization of the liquid causing the creation of the shock wave.
  • part of the end 132 of the peripheral electrode 130 surrounds the lower end 122 of the central electrode 120.
  • An electric arc is preferably created between two zones 124 and 134, called active parts. , the central electrode 120 and the peripheral electrode 130 respectively.
  • an electric arc is preferably created between two different points of the external surface 125 of the active part 124 of the central electrode 120 and of the internal surface 135 of the active part 134 of the peripheral electrode 130 corresponding to the shortest path between the central electrode 120 and the peripheral electrode 130, respectively.
  • each electrode wears out locally at different points distributed over the external surface 125 of the active part 124 of the central electrode 120 and on the internal surface 135 of the active part 134 of the peripheral electrode 130.
  • the wear of the peripheral electrode being distributed over a larger area, the distance between the electrodes varies less than with a device of the prior art in which two electrodes, most often conical, are placed face to face and the active parts of which are therefore very localized.
  • the electrodes can therefore be used longer without the efficiency of the electrohydroforming, and in particular the pressure generated by the shock wave, being affected.
  • section of the central electrode is not necessarily constant along its longitudinal axis XX 'as illustrated by example with reference to figure 2 .
  • section of the electrode is not necessarily axisymmetric.
  • the blank of material 160 is held against the mold 150 by the peripheral electrode 130 ( figure 1A ).
  • the peripheral electrode 130 also comprises, on its lower face, a shoulder in which the material blank 160 can be housed.
  • the peripheral electrode 130 then acts as a blank holder and makes it possible to hold the material blank. 160 against the mold 150.
  • the electrohydroforming device 100 further comprises an electrode holder 136 supporting the peripheral electrode 130.
  • the electrode holder 136 is arranged between the mold 150 and the body 140. It comprises on its lower face a shoulder in which the blank of material 160 can be housed. and on its upper face a housing adapted to accommodate the peripheral electrode 132.
  • the electrode holder 136 therefore also acts as a blank holder to hold the blank of material 160 against the mold 150.
  • an additional part 280 can be used to act as a blank holder and to hold the blank of material to be deformed against the mold as illustrated with reference to figure 2 , for example.
  • the electrode holder 136 does not have a shoulder on its underside.
  • the body 140, the peripheral electrode 130 and the mold 150 are in electrical contact with one another when they are made of a conductive material such as steel, or any other alloy. metallic.
  • an electrical insulator 115 surrounds the central electrode 120 over at least part of its length, in particular over the part of the central electrode 120 housed in the body 140.
  • the central electrode 120 is therefore electrically isolated from the peripheral electrode 130, even if the body 140 is in electrical contact with the peripheral electrode 130.
  • the central electrode 120 can therefore be subjected to a first electric potential by connecting it to one of the terminals of a high voltage pulse generator 170 and by connecting the body 140, the peripheral electrode 130 or the mold 150 to the other terminal of the pulse generator high voltage 170.
  • This embodiment of the invention is particularly advantageous because it is easy to machine and to assemble.
  • the mold 150 can be made in one piece or be fixed to an additional part called the mold support, thus making it easier to change the mold depending on the part to be formed.
  • the central electrode can be fixed in the electrohydroforming device by various means. It can, for example, be held using an additional part (not shown) electrically insulated from the body.
  • the assembly formed by the mold and the peripheral electrode is movable relative to the body comprising the central electrode and the body is preferably fixed.
  • the peripheral electrode is then fixed to the mold.
  • the mold is mounted on the plate of a press and the peripheral electrode is fixed directly to the body.
  • the material blank is held between the peripheral electrode and the mold when the mold is held against the peripheral electrode using the press.
  • peripheral electrode is easily accessible and can be easily changed.
  • the figure 2 shows a second embodiment of an electrohydroforming device according to the invention.
  • the electrohydroforming device 200 is similar to that shown with reference to figure 1A in that it also comprises an electrohydroforming chamber 210, a central electrode 220, a peripheral electrode 230, a body 240 and a mold 250.
  • the electrohydroforming device 200 further comprises an additional part 280 acting as a blank holder.
  • the device further comprises an electrode holder 232 on which the peripheral electrode 230 is fixed.
  • the body 240 further comprises an electrical insulator 215 positioned, no longer between the body and the central electrode as illustrated with reference to figures 1A and 1B , but for example, on the lower part of the body 240.
  • the electrical insulator 215 constitutes the side wall 243 of the cavity 240 partly forming the electrohydroforming chamber 210. In other variants embodiment, the electrical insulator 215 may form only part of the side wall.
  • the central electrode 220 and the upper part 241 of the body 240 are then in electrical contact and the upper part 241 of the body 240, for example, can be connected to a first terminal of the high voltage pulse generator 270.
  • the peripheral electrode 230, the electrode holder 232, the blank holder 280 and the mold 250 are in electrical contact and the peripheral electrode 230 is connected to a second terminal of the high voltage pulse generator 270 through the electrode holder 232, the clamp blank 280 or of the mold 250 thus causing an electric discharge between the central electrode 220 and the peripheral electrode 230.
  • the shock wave thus generated propagates in a plane perpendicular to this discharge.
  • part of the shock wave propagates towards the bottom wall 244 and impacts this wall, which can damage it. Since the insulation is located on the side wall, it is therefore less stressed, which reduces its risk of damage.
  • the body 240 comprises a cavity 242 and that the side wall 243 and the bottom wall 244 can have different shapes adapted to better containment of the pressure waves towards the blank of material to be deformed.
  • the bottom wall 244 can be inclined so as to better reflect the shock waves towards the blank of material to be deformed.
  • the active part 224 of the central electrode 220 and the active part 234 of the peripheral electrode 230 are not necessarily of constant and / or axisymmetric section as illustrated with reference to figure 2 .
  • electrohydroforming devices have only one central electrode and one peripheral electrode.
  • the electrohydroforming device may include several pairs of central and peripheral electrodes associated with one or more molds. It is thus possible to produce several parts in parallel or a large part by implementing several electric discharges in parallel.
  • FIGS. 3A to 3D illustrate more particularly the active parts of central and peripheral electrodes seen in section along a plane (YY ', ZZ') perpendicular to the longitudinal axis XX 'of a central electrode.
  • the active part 301 of the central electrode is circular in shape and the active part 302 of the peripheral electrode has the shape of a circular ring.
  • the active parts 303, 305, 307 of several central electrodes are of rectangular section, preferably with rounded corners, and aligned in a common direction ZZ 'at the center of a ring of rectangular shape forming the active part 308 of the electrode corresponding device.
  • the active parts 309, 311 of several central electrodes are of elliptical section and aligned in a common direction ZZ 'at the center of an elliptical shaped ring forming the active part 312 of the corresponding peripheral electrode.
  • the active parts 313, 314, 315, 316 of four central electrodes are of square rectangular section, preferably with rounded corners, and are arranged inside a square-shaped ring forming the active part 317 of the electrode corresponding device.
  • peripheral electrodes described here are formed in one piece.
  • the peripheral electrodes comprise different separate sections intended to be placed opposite each central electrode in order to generate discharges. These different sections therefore include the active parts of the peripheral electrode. The costs of replacing the peripheral electrodes are thus reduced by replacing only certain sections. It will be noted that other geometric shapes can also be used provided that the distance between the external surface of the active part of the central electrode considered and the internal surface of the active part of the neighboring peripheral electrode is substantially equidistant over at minus a portion of the surfaces of the active parts considered in the plane.
  • the section of the active parts of the electrodes can be constant or vary according to their longitudinal direction represented by the axis XX 'on the figures 1A , 1B and 2 .
  • an electrohydroforming device allows the electrohydraulic forming of blanks of material with a peripheral electrode partially surrounding a central electrode, the peripheral electrode being separate from the body forming part of the chamber. electrohydroforming.
  • the electric discharge is therefore distributed over the periphery of the active parts of the electrodes.
  • the peripheral electrode which has a larger contact surface, wears out more slowly.
  • the distance between the electrodes varies little, which makes it possible to maintain the efficiency of the electrohydroforming while keeping a pressure generated by the electric discharge substantially constant.
  • the peripheral electrode can advantageously easily be changed when the electrohydroforming device is opened to place the material blank, the peripheral electrode being separate from the body and the material blank. being preferably placed between the peripheral electrode and the mold.
  • the central electrode can be moved along its longitudinal axis in order to present to the peripheral electrode a less degraded active part.
  • the present invention is not limited to the various embodiments described and illustrated and to the variants mentioned, but it also relates to the embodiments within the reach of a person skilled in the art within the framework of the claims below.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
EP18703599.3A 2017-02-08 2018-02-08 Dispositif d'electrohydroformage Active EP3579990B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1751053A FR3062586B1 (fr) 2017-02-08 2017-02-08 Dispositif d'electrohydroformage
PCT/EP2018/053214 WO2018146216A1 (fr) 2017-02-08 2018-02-08 Dispositif d'electrohydroformage

Publications (2)

Publication Number Publication Date
EP3579990A1 EP3579990A1 (fr) 2019-12-18
EP3579990B1 true EP3579990B1 (fr) 2020-10-14

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ID=58707742

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18703599.3A Active EP3579990B1 (fr) 2017-02-08 2018-02-08 Dispositif d'electrohydroformage

Country Status (6)

Country Link
US (1) US11338346B2 (zh)
EP (1) EP3579990B1 (zh)
JP (1) JP7083176B2 (zh)
CN (1) CN110582360B (zh)
FR (1) FR3062586B1 (zh)
WO (1) WO2018146216A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111300671A (zh) * 2020-02-28 2020-06-19 南方科技大学 一种晶圆减薄装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4068514A (en) * 1976-07-12 1978-01-17 Viktor Nikolaevich Chachin Device for electrohydraulic die-forging
RU2060077C1 (ru) * 1992-09-02 1996-05-20 Волгоградский государственный технический университет Способ электрогидроимпульсного деформирования трубчатых заготовок
JP4944322B2 (ja) * 2001-09-26 2012-05-30 本田技研工業株式会社 中空部材の製造方法
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
US8567223B2 (en) * 2009-09-21 2013-10-29 Ford Global Technologies, Llc Method and tool for expanding tubular members by electro-hydraulic forming
FR3000909B1 (fr) * 2013-01-11 2015-05-15 Adm28 S Ar L Procede, outillage et presse de formage d'une piece
FR3013243B1 (fr) * 2013-11-15 2016-01-01 Adm28 S Ar L Dispositif d'electro-hydroformage
TW201600310A (zh) * 2014-06-17 2016-01-01 Univ Nat Kaohsiung 1St Univ Sc 具傾斜夾料面的引伸模具
FR3031054B1 (fr) 2014-12-29 2017-01-27 Adm28 S Ar L Dispositif d'electro-hydroformage avec chambre optimisee
CN104785605B (zh) * 2015-03-31 2017-04-19 西北工业大学 一种用于管件的电液成形装置及成形方法

Non-Patent Citations (1)

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Also Published As

Publication number Publication date
US11338346B2 (en) 2022-05-24
JP2020506809A (ja) 2020-03-05
FR3062586B1 (fr) 2020-02-28
WO2018146216A1 (fr) 2018-08-16
CN110582360A (zh) 2019-12-17
FR3062586A1 (fr) 2018-08-10
JP7083176B2 (ja) 2022-06-10
CN110582360B (zh) 2020-12-04
US20200001344A1 (en) 2020-01-02
EP3579990A1 (fr) 2019-12-18

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