[go: up one dir, main page]

US3603127A - Device for forming workpieces hydroelectrically - Google Patents

Device for forming workpieces hydroelectrically Download PDF

Info

Publication number
US3603127A
US3603127A US834690A US3603127DA US3603127A US 3603127 A US3603127 A US 3603127A US 834690 A US834690 A US 834690A US 3603127D A US3603127D A US 3603127DA US 3603127 A US3603127 A US 3603127A
Authority
US
United States
Prior art keywords
electrodes
ignitor
forming
workpiece
fibers
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.)
Expired - Lifetime
Application number
US834690A
Other languages
English (en)
Inventor
Helmut Seiffert
Jochen Haeusler
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens Corp
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 Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US3603127A publication Critical patent/US3603127A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • B21D26/10—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 evaporation, e.g. of wire, of liquids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S65/00—Glass manufacturing
    • Y10S65/04—Electric heat

Definitions

  • a device for forming workpieces by pressure waves generated inv a liquid by an undersurfnee spark discharge has two electrodes immersed in the liquid. The electrodes are-mutually separated so as to define a spark gap.
  • a capacitor battery is connected across the electrodes and un ignitor is suspended between the electrodes.
  • the ignitor is made up of a carrier threaded of nonconductive material surrounded by a sheath of conductive material.
  • Our invention relates to a device for forming workpieces wherein pressures waves are produced by underwater spark discharges of a bank of capacitors over a spark gap, an ignitor being arranged between the electrodes in the spark gap.
  • the pressure wave required for forming the workpiece is produced by an underwater spark discharge.
  • the sparkover occurs between electrodes disposed in the water after a bank of capacitors charged to a high voltage is switched in.
  • the electrical field strength which results from the electrode spacing and the capacitor voltage suffices for impact ionizing the water or other suitable transfer medium.
  • the electrode spacing for a free sparkover is limited to several centimeters.
  • this limitation remains when the liquid which functions as a transfer medium contains particles, preferably metallic, in the fonn of a fine distribution or suspension. Consequently, the electrode spacing for a free sparkover cannot be arbitrarily increased. Also, since the particles are evenly distributed in the liquid in order to prevent sparkovers to the workpiece, the electrode spacing should be shorter than the shortest distance between the workpiece and the electrodes.
  • the ignition must be provided by means other than a free sparkover.
  • the most well-known solution in such instances is to use thin wires which are clamped between the electrodes and which are vaporized in the manner of an explosion at the start of the capacitor discharge.
  • the use of ignition wires has the disadvantage that its automatic introduction into the spark gap is associated with various difficulties such as the welding of the contact regions at the electrodes.
  • lt is another object of the invention to provide a workpieceforrning device wherein the installation of the ignitor is greatly facilitated.
  • the workpiece forming device is provided with an ignitor comprising a thread of a nonconductive carrier enclosed in a conductive sheath.
  • an ignitor comprising a thread of a nonconductive carrier enclosed in a conductive sheath. The formation of an underwater spark discharge of a bank of capacitors is thereby facilitated.
  • a most significant advantage afforded by the invention is the considerable ease with which the ignitor is placed in the spark gap as compared with the wires used in some of the known devices.
  • a workpiece-forming device according to the invention operates at maximum efficiency and only a slight burn-off of the electrodes from the discharge of the ignitor occurs. Following the discharge, the nonconductive carrier remains almost intact and is only divested of its conductive sheath. This is especially surprising since the materials used as carriers can be ignited even by the flame of a match whereas the temperatures in the spark gap occurring during explosions of the wires are estimated to be at several thousand degrees Kelvin and the carriers are subjected to pressures which act to form the workpiece.
  • the thread which functions as the ignitor can, for example, be comprised of a carrier of textile fibers and a sheath of conductive powder.
  • Carrier threads made from any of the following materials are suitable: cotton, hemp, silk and synthetic material such as, for example, Perlon.
  • the most suitable sheath is conductive silver, graphite, nickel-, copperand tungsten-powder prepared in a mixture of a nitrovarnish and solvent.
  • the choice of the solvent portion and of the thickness of the sheath can influence the resistance of the ignitor.
  • an electrode spacing of 180 mm. and a resistance range of lit to 100. establish the same optimal forming of the workpiece.
  • the sheath or coating is not a critical magnitude and can, therefore, be applied with an inexpensive dipping process.
  • the sheath can also be applied, for example, by vapor deposition, galvanically or by other appropriate methods.
  • FIG. 1 is a schematic illustration of an embodiment of the invention for forming cylindrical workpieces
  • FIGS. 2 and 3 are schematic illustrations of embodiments of the invention for forming planar workpieces.
  • FIG. 1 illustrates an embodiment of the invention used for forming workpieces having a cylindrical configuration. This embodiment makes it possible for the first time to form an elongated cylindrical workpiece according to the hydrospark method with multiple discharges and a one-time installation of the workpiece in the workpieceforming device.
  • the table below illustrates various combinations of nonconductive carrier and conductive sheath materials which can make up the ignitor of the forming device for forming an annealed steel pipe 60 mm. in diameter and having a wall thickness of 1 mm.
  • the electrode spacing is 180 mm. and the charge on the capacitor battery is 20 kv., the latter having a capacitance of 16.8 pf.
  • reference numeral 1 denotes the workpiece to be formed, namely, a water-filled tube which is sealed on top and bottom by insulating parts 2.
  • insulating parts 2 By means of a central bore through the insulating parts 2, two electrodes 3a, 3b extend into the water chamber and are screwed into the terminal brackets 4 of the hydrospark installation.
  • the ignitor 5 starts from a reel 6 and is guided through the bore of earthgrounded electrode 3a. Provided the insulation is adequate,
  • electrode 3b is connected to a bank of capacitors 7 via threeelectrode spark gap 8.
  • a high voltage is applied to electrode 3b.
  • the energizing circuit for the capacitor bank and an ignition electrode for ener gizing the three-electrode spark gap 8 are disclosed in copending application Ser. No. 803,179, filed on Feb. 28, 1969 and having the title: Hydroelectric Forming of Cylindrical Work piece by Capacitor Discharge.
  • the nonconductive carrier of the ignitor 5 is transported along the electrode 3b such that the segment of the ignitor 5 between the electrodes will again have a sheath and so conductively bridge the electrodes.
  • the second discharge can follow provided the assembly remains tight after the first discharge.
  • the assembly will remain tight because the second and subsequent discharges are of significant consequence only if the preceding discharge results in a slight forming of the workpiece.
  • the means required to ensure a good seal are only symbolically represented by the sealing rings 9.
  • Planar pressure waves are desirable, for example, for forming workpieces such as sheet metal by stamping, deep drawing and punching, the workpieces being planar prior to forming.
  • the portion of the pressure wave which does not impinge directly upon the planar-workpiece can be directed to the workpiece with the aid of reflectors and with a shift in the transit time.
  • the ignitor according to the invention which works at optimum efficiency for cylindrical forming as indicated by the table, can also be applied successfully for forming the planar workpiece.
  • FIGS. 2 and 3 illustrate embodiments of the invention which function to produce approximately planar pressure waves.
  • the arrows 30 and 40 in FIGS. 2 and 3 respectively emphasize that here too the ignitor permits a renewed bridging of the spark gap through an additional transport of the carrier.
  • FIG. 2 is exemplary of a device for forming planar workpieces with a cylindrical pressure wave and a reflector cap.
  • the workpiece 21 to be formed is clamped to a form 23 with a holding implement.
  • the reflector cap 24 is disposed above the workpiece and the space between workpiece 21 and cap 24 is filled with water 25.
  • the perpen- 0 2s is the double deforming path.
  • the dicular walls of the cap hold two insulating parts 26 through which pass the electrodes 27.
  • the ignitor 28 runs through a bore in the electrodes, and its continuous transport is achieved as depicted in FIG. 1.
  • the electrodes 27 are connected via terminal brackets 29 to a bank of capacitors 19 which is .ess ai sek s rsvs e-shapes steak s t? 2;
  • FIG. 3 shows another embodiment of a device for forming a planar workpiece 31 by means of several superimposed, cylindrical pressure waves.
  • the workpiece 31 is secured to a form 33 with a holddown device 32.
  • the water chamber 35 is sealed above by cap 34 which contains several wall-mounted insulating parts 36.
  • Electrodes 37 are guided through two of these insulating parts and are connected to a capacitor bank (not shown) via terminal brackets 39.
  • the other insulating parts contain eyelets or guide rollers 41 for directing the ignitor 38. Following a discharge of the capacitor bank the ignitor is transported further by the unimpaired carrier and thereby establishing a renewed bridging of the spark gap.
  • a device for forming workpieces by pressure waves w generated in a liquid by an undersurface spark discharge comprising two electrodes immersed in said liquid and mutually separated so as to define a spark gap, a capacitor battery connected across said electrodes, and an ignitor suspended between said electrodes in said spark gap, said ignitor comprising a carrier thread of textile fibers and a coating of conductive powder covering said thread.
  • said textile fibers being selected from the group consisting of cotton, synthetic material, hemp and silk.
  • said conductive powder being selected from the group consisting of conductive silver, graphite, copper, nickel and tungsten.
  • said carrier thread consisting of cotton fibers and having a thickness of 2 to 3 mm.
  • said carrier thread consisting of hemp fibers and having a thickness of l to 2 mm.
  • said carrier thread consisting of Perlon fibers and having a thickness of 0.5 to 1.0 mm.
  • said carrier thread consisting of silk fibers and having a thickness of 0.3 to 0.5 mm.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Spark Plugs (AREA)
US834690A 1968-06-24 1969-06-19 Device for forming workpieces hydroelectrically Expired - Lifetime US3603127A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH944668A CH478604A (de) 1968-06-24 1968-06-24 Vorrichtung zum Umformen von Werkstücken mittels Druckwellen

Publications (1)

Publication Number Publication Date
US3603127A true US3603127A (en) 1971-09-07

Family

ID=4352081

Family Applications (1)

Application Number Title Priority Date Filing Date
US834690A Expired - Lifetime US3603127A (en) 1968-06-24 1969-06-19 Device for forming workpieces hydroelectrically

Country Status (5)

Country Link
US (1) US3603127A (de)
CH (1) CH478604A (de)
DE (1) DE1806283B1 (de)
FR (1) FR2011539A1 (de)
GB (1) GB1241343A (de)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750441A (en) * 1970-03-18 1973-08-07 Siemens Ag Device for forming workpieces by means of underwater spark discharges
US4030329A (en) * 1976-07-12 1977-06-21 Viktor Nikolaevich Chachin Device for electrical discharge forming
US5827346A (en) * 1996-01-31 1998-10-27 Lucent Technologies Inc. Method of making core holes in cast optical fiber preforms by drawing a wire therethrough during solidification
US6176970B1 (en) * 1999-03-23 2001-01-23 Dynawave Corporation Device and method of using explosive forces in a contained liquid environment
US20050167059A1 (en) * 1999-03-23 2005-08-04 Staton Vernon E. Device and method of using explosive forces in a contained environment
US7516634B1 (en) 2008-05-05 2009-04-14 Ford Global Technologies, Llc Electrohydraulic forming tool
US20090272165A1 (en) * 2008-05-05 2009-11-05 Ford Global Technologies, Llc Electrohydraulic trimming, flanging, and hemming of blanks
US20090272167A1 (en) * 2008-05-05 2009-11-05 Ford Global Technologies, Llc Pulsed electro-hydraulic calibration of stamped panels
US20090272168A1 (en) * 2008-05-05 2009-11-05 Ford Global Technologies, Llc Electrohydraulic forming tool and method of forming sheet metal blank with the same
FR2933321A1 (fr) * 2008-07-04 2010-01-08 Nantes Ecole Centrale Electrode pour machines-outils de formage electro-hydraulique
US20100132194A1 (en) * 2006-09-27 2010-06-03 Rolls-Royce Plc Method and an apparatus for prestressing components
US7905129B1 (en) * 2009-09-21 2011-03-15 Ford Global Technologies, Llc Method and tool for contracting tubular members by electro-hydraulic forming before hydroforming
US20110067470A1 (en) * 2009-09-21 2011-03-24 Ford Global Technologies, Llc Method and Tool for Expanding Tubular Members by Electro-Hydraulic Forming
US20110088442A1 (en) * 2009-10-19 2011-04-21 Ford Global Technologies, Llc Hydromechanical Drawing Process and Machine
US20120312060A1 (en) * 2011-06-10 2012-12-13 Ford Global Technologies, Llc Method and Apparatus for Pulsed Forming, Punching and Trimming of Tubular Members
FR2987288A1 (fr) * 2012-02-29 2013-08-30 Adm28 S Ar L Tete d'un dispositif de decharge electrohydraulique par fil explose
US8667823B2 (en) 2011-09-20 2014-03-11 Ford Global Technologies, Llc Apparatus and method using reduced volume electro-hydraulic chambers for trimming and joining panels
US10012063B2 (en) 2013-03-15 2018-07-03 Chevron U.S.A. Inc. Ring electrode device and method for generating high-pressure pulses
US20230070535A1 (en) * 2021-09-06 2023-03-09 Industry-Academic Cooperation Foundation, Dankook University Peening apparatus and method of peening using the same
WO2025015062A1 (en) 2023-07-12 2025-01-16 Ene29, Inc. High-power electrical discharge tool with plastic wire

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2447761A1 (fr) * 1979-01-31 1980-08-29 Barras Provence Installation pour deformer un tube
DE3170485D1 (en) * 1980-07-07 1985-06-20 Matija Cenanovic Pipe repair methods and apparatus using an electromagnetically exploded filament
DE3419816C2 (de) * 1984-05-28 1987-04-30 Dornier System Gmbh, 7990 Friedrichshafen Vorrichtung zur Erzeugung hoher Drucke
FR3128662B1 (fr) 2021-11-04 2024-01-12 Safran Procede de fabrication d’une piece hybride et d’un joint par fabrication additive

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3200626A (en) * 1961-12-26 1965-08-17 Gen Electric Electrical explosion forming
US3228221A (en) * 1961-09-18 1966-01-11 Aerojet General Co Apparatus for forming material
US3267710A (en) * 1962-09-24 1966-08-23 Inoue Kiyoshi Impulsive shaping and bonding of metals and other materials

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1223333B (de) * 1963-05-24 1966-08-25 Westinghouse Electric Corp Anordnung zur elektrohydraulischen Metallverformung
DE1252449B (de) * 1963-11-13
DE1213514B (de) * 1965-01-26 1966-03-31 Bbc Brown Boveri & Cie Verfahren zum Zuenden einer an Spannung liegenden Funkenstrecke

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3228221A (en) * 1961-09-18 1966-01-11 Aerojet General Co Apparatus for forming material
US3200626A (en) * 1961-12-26 1965-08-17 Gen Electric Electrical explosion forming
US3267710A (en) * 1962-09-24 1966-08-23 Inoue Kiyoshi Impulsive shaping and bonding of metals and other materials

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750441A (en) * 1970-03-18 1973-08-07 Siemens Ag Device for forming workpieces by means of underwater spark discharges
US4030329A (en) * 1976-07-12 1977-06-21 Viktor Nikolaevich Chachin Device for electrical discharge forming
US5827346A (en) * 1996-01-31 1998-10-27 Lucent Technologies Inc. Method of making core holes in cast optical fiber preforms by drawing a wire therethrough during solidification
US6176970B1 (en) * 1999-03-23 2001-01-23 Dynawave Corporation Device and method of using explosive forces in a contained liquid environment
US6837971B1 (en) 1999-03-23 2005-01-04 Dynawave Corporation Device and method of using explosive forces in a contained liquid environment
US20050167059A1 (en) * 1999-03-23 2005-08-04 Staton Vernon E. Device and method of using explosive forces in a contained environment
US7510625B2 (en) 1999-03-23 2009-03-31 Dynawave Corporation Device and method of using explosive forces in a contained environment
US20100132194A1 (en) * 2006-09-27 2010-06-03 Rolls-Royce Plc Method and an apparatus for prestressing components
US8316678B2 (en) * 2006-09-27 2012-11-27 Rolls-Royce Plc Method and an apparatus for prestressing components
US20090272165A1 (en) * 2008-05-05 2009-11-05 Ford Global Technologies, Llc Electrohydraulic trimming, flanging, and hemming of blanks
US20090272167A1 (en) * 2008-05-05 2009-11-05 Ford Global Technologies, Llc Pulsed electro-hydraulic calibration of stamped panels
US20090272168A1 (en) * 2008-05-05 2009-11-05 Ford Global Technologies, Llc Electrohydraulic forming tool and method of forming sheet metal blank with the same
US7516634B1 (en) 2008-05-05 2009-04-14 Ford Global Technologies, Llc Electrohydraulic forming tool
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
US7810366B2 (en) 2008-05-05 2010-10-12 Ford Global Technologies, Llc Electrohydraulic trimming, flanging, and hemming of blanks
US7827838B2 (en) 2008-05-05 2010-11-09 Ford Global Technologies, Llc Pulsed electro-hydraulic calibration of stamped panels
FR2933321A1 (fr) * 2008-07-04 2010-01-08 Nantes Ecole Centrale Electrode pour machines-outils de formage electro-hydraulique
US20110067467A1 (en) * 2009-09-21 2011-03-24 Ford Global Technologies, Llc Method and tool for contracting tubular members by electro-hydraulic forming before hydroforming
US7905129B1 (en) * 2009-09-21 2011-03-15 Ford Global Technologies, Llc Method and tool for contracting tubular members by electro-hydraulic forming before hydroforming
US20110067470A1 (en) * 2009-09-21 2011-03-24 Ford Global Technologies, Llc Method and Tool for Expanding Tubular Members by Electro-Hydraulic Forming
US8567223B2 (en) 2009-09-21 2013-10-29 Ford Global Technologies, Llc Method and tool for expanding tubular members by electro-hydraulic forming
US20110088442A1 (en) * 2009-10-19 2011-04-21 Ford Global Technologies, Llc Hydromechanical Drawing Process and Machine
US9375775B2 (en) 2009-10-19 2016-06-28 Ford Global Technologies, Llc Hydromechanical drawing process and machine
US8534106B2 (en) 2009-10-19 2013-09-17 Ford Global Technologies, Llc Hydromechanical drawing process and machine
US20120312060A1 (en) * 2011-06-10 2012-12-13 Ford Global Technologies, Llc Method and Apparatus for Pulsed Forming, Punching and Trimming of Tubular Members
US8534107B2 (en) * 2011-06-10 2013-09-17 Ford Global Technologies, Llc Method and apparatus for pulsed forming, punching and trimming of tubular members
US8667823B2 (en) 2011-09-20 2014-03-11 Ford Global Technologies, Llc Apparatus and method using reduced volume electro-hydraulic chambers for trimming and joining panels
CN104302419A (zh) * 2012-02-29 2015-01-21 Adm28责任有限公司 爆炸线电动液压放电装置的头部
WO2013127706A1 (en) * 2012-02-29 2013-09-06 Adm28 S.Àr.L Head of an exploding-wire electrohydraulic discharge device
FR2987288A1 (fr) * 2012-02-29 2013-08-30 Adm28 S Ar L Tete d'un dispositif de decharge electrohydraulique par fil explose
CN104302419B (zh) * 2012-02-29 2017-05-10 Adm28责任有限公司 爆炸线电动液压放电装置的头部
US9802237B2 (en) 2012-02-29 2017-10-31 ADM28 s.ár.l. Head of an exploding-wire electrohydraulic discharge device
US10012063B2 (en) 2013-03-15 2018-07-03 Chevron U.S.A. Inc. Ring electrode device and method for generating high-pressure pulses
US10077644B2 (en) 2013-03-15 2018-09-18 Chevron U.S.A. Inc. Method and apparatus for generating high-pressure pulses in a subterranean dielectric medium
US20230070535A1 (en) * 2021-09-06 2023-03-09 Industry-Academic Cooperation Foundation, Dankook University Peening apparatus and method of peening using the same
US11958095B2 (en) * 2021-09-06 2024-04-16 Industry-Academic Cooperation Foundation, Dankook University Peening apparatus and method of peening using the same
WO2025015062A1 (en) 2023-07-12 2025-01-16 Ene29, Inc. High-power electrical discharge tool with plastic wire
FR3150969A1 (fr) 2023-07-12 2025-01-17 ENE29 Inc, Outil de décharge électrique à haute puissance à fil plastique

Also Published As

Publication number Publication date
GB1241343A (en) 1971-08-04
CH478604A (de) 1969-09-30
DE1806283B1 (de) 1969-10-02
FR2011539A1 (de) 1970-03-06

Similar Documents

Publication Publication Date Title
US3603127A (en) Device for forming workpieces hydroelectrically
US3750441A (en) Device for forming workpieces by means of underwater spark discharges
US2354786A (en) Spark gap
US3680397A (en) Method of forming workpieces by means of underwater impact pressure
FR2055181A5 (en) Wire for mechanical or semimechanical - welding
US3559435A (en) Liquid bridge wire
US4121123A (en) Explosively driven plasma current generator
US3323002A (en) Triggered vacuum gap device having field emitting trigger assembly
US3989973A (en) Cold-cathode gas-discharge device
US2990492A (en) Electric discharge device
US2894161A (en) Method and apparatus for electric ignition
US3207947A (en) Triggered spark gap
GB1378367A (en) Method of and device for the removal of electrostatic charges
US3371607A (en) Arrangement for increasing the safety against unintentional initiation of socalled low energy detonating cord assemblies
US2457102A (en) Spark gap
US3462633A (en) Energy burst generating element
US3314361A (en) Miniature triggered gap in coaxial squib
US3418510A (en) Triggered spark gap electric arcing device
US3112401A (en) Shielding to confine magnetic field to ion source area of a neutron generator
US3610989A (en) Production and utilization of high-density plasma
US2687466A (en) Method of welding of composite metal
US2906911A (en) Leading-in insulators for electric glow discharge receptacles
US1961708A (en) System for influencing an electric current by irradiation
GB1380556A (en) Ignition systems
US3366824A (en) Low pressure gas discharge device with parallel electrodes and a sliding spark triggering electrode