US3852985A - Device for processing elongated tubular workpieces by pressure waves - Google Patents

Device for processing elongated tubular workpieces by pressure waves Download PDF

Info

Publication number
US3852985A
US3852985A US00876773A US87677369A US3852985A US 3852985 A US3852985 A US 3852985A US 00876773 A US00876773 A US 00876773A US 87677369 A US87677369 A US 87677369A US 3852985 A US3852985 A US 3852985A
Authority
US
United States
Prior art keywords
spark gap
workpiece
discharge
structure means
spark
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
US00876773A
Other languages
English (en)
Inventor
J Haeusler
G Marz
H Seiffert
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 US3852985A publication Critical patent/US3852985A/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
    • B21D26/10—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

Definitions

  • Our invention relates to device for processing elongated tubular workpieces by pressure waves. Such workpieces can have either a straight or a bent or curved axis. More specifically our invention relates to device for processing such workpieces by pressure waves produced in a liquid medium i.e., underwater for example, by spark discharge.
  • the best known measure to be taken in such cases is to employ thin wires that are stretched between the electrodes and vaporized explosively by discharging the condenser.
  • the use of ignition wires has a series of disadvantages associated therewith that makes it difficult to automatize this high-speed deforming process which is rather vital for carrying out production-line processing of workpieces by underwater pressure pulses.
  • a component of the device employed for carrying out this known high-speed deforming process namely the wire which is exploded, must be replaced after each discharge, so that the performance of a processing cycle takes a relatively long time.
  • the length of the processing cycle can, however, still be kept within bearable limits in the case of devices wherein workpieces that are being processed do not surround the wire serving as ignition device, because the introduction of the workpiece into the processing device and the insertion of the ignition device between the electrodes of the spark gap can then be carried out independently of one another and, hence, simultaneously.
  • a filament formed of a nonconductive core and a conductive coating thereon is employed as the ignition device instead of the explosive wire, the fact that the nonconductive core is intact after the discharge reduces the problem of inserting the ignition device to a simple process of advancing the filament so that a succeeding length thereof having conductive coating on the nonconductive core thereof newly bridges the electrodes of the spark gap.
  • closed or tubular workpieces such as profile tubes for example
  • closed or tubular workpieces are always so interlinked with the discharge circuit of the condenser battery in the known devices wherein the electrodes of the spark gap are bridged by an ignition device, that the insertion of the ignition device and of the workpiece can not be effected independently of one another but rather only by maintaining them in sequence i.e., by carrying out the insertions of the ignition device and the workpiece one after the other.
  • device for processing elongated tubular workpieces by subjecting them to pressure waves produced in a liquid medium by spark discharge comprising a discharge circuit including condenser means and a spark gap formed of a pair of spaced electrodes electrically connected to the condenser means, an ignition device disposed in the spark gap between the electrodes thereof, structure means. coaxially surrounding the spark gap and forming part of the discharge circuit, the structure means being encirclable by a tubular workpiece so that the workpiece surrounds the spark gap, the structure means being pervious to pressure transmitted through a liquid medium receivable therein and generated by an electrical discharge at the spark gap.
  • the structure means forming part of the discharge circuit has a bird cage construction, and, more specifically, is made up of a metal cover plate, a base member of insulating material and a plurality of metallic rods extending between the cover plate and the base member.
  • the rods of the structure means are displaceable and adjustable so that the current path therethrough is capable of being set for varying processing lengths.
  • one of the rods of the structure means is formed with an elongated bore for supplying the ignition device i.e., the conductively coated filament, therethrough to the spark gap.
  • the metallic cover plate and the insulating base plate with respective central projections directed toward the interior of the structure means, the central projections being moreover conical in shape.
  • FIG. 1 is a longitudinal sectional view, partly schematic, of the device for processing elongated tubular workpieces by means of pressure waves according to the invention
  • FIGS. la and lb are cross-sectional views of two different embodiments respectively of the cage-like structure means for the workpiece according to FIG. 1;
  • FIG. 2 is a longitudinal sectional view similar to that of FIG. 1 of another embodiment of the invention having a longitudinal bore in a bar of the structure means, taken along the line IIII in FIG. 2a and including a workpiece mounted therein;
  • FIG. 2a is a cross-sectional view of FIG. 2 with the workpiece omitted;
  • FIG. 3 is a longitudinal sectional view similar to those of FIGS. 1 and 2 of yet another embodiment of the invention wherein the electrically conductive structure means is constructed for relatively short spacings of the spark gap electrodes;
  • FIG. 4 is a longitudinal sectional view similar to those of FIGS. 1, 2 and 3 of a further embodiment of the invention wherein the electrically conductive structure means is adjustable to the respective processing length;
  • FIG. 5 is a longitudinal sectional view similar to those of FIGS. 1, 2, 3 and 4 of an additional embodiment of the invention for processing bent or curved workpieces;
  • FIG. 5a is a cross-sectional view of FIG. 5 with the workpiece omitted.
  • Our invention is based on the surprising fact that the widening of sleeve-like or tubular workpieces, such as cylindrical tubes, for example, through radially disposed narrow bars which, as part of the electrical discharge circuit, are surrounded by a tubular workpiece and extend parallel to the axis of the tubular workpiece, is not nonuniform in spite of the fact that parts of the wall of the tubular workpiece are located behind the bars away from the ignition device and in so-called pressure shadows.
  • FIGS. 1, la and 1b there is shown an embodiment of the device for processing elongated tubular workpieces by means of pressure waves constructed according to our invention with a cage-like electrically conductive structure means 11 formed of a metallic cover plate 12, a plurality of metal rods or bars 13 and a base 14 of insulating material through the center of which a high-voltage electrode 15 extends.
  • the cover plate 12 and the bars 13 which join an electrically conductive base plate 16 provide a current conductive path forming part of a hereinafter-described discharge circuit for the device of ourcinvention.
  • the bars 13 of the current-conductive structural member 11 are of relatively narrow construction, with the lateral surfaces thereof extending substantially in radial direction of the current-conductive structural member 11, so as to be pervious to and permit passage through the spaces therebetween of pressure waves, generated by an ignition device 17 in a suitable liquid medium provided in the structural member 11.
  • the ignition device 17, in the illustrated embodiment of FIG. 1, is in theform of a filament having a nonconductive core covered by an electrically conductive coating.
  • the cross section of the rods 13 may be conveniently wedge-shaped or lensshaped, respectively with the side surfaces thereof extending in a substantially radially direction from the center of the current-conducting structural member 11.
  • the device of our invention can also be constructed for processing or deforming profile tubes such as tubes having rectangular or other polygonal cross sections for example.
  • profile tubes such as tubes having rectangular or other polygonal cross sections for example.
  • the cross sections of such profile tubes can also be variable in the direction of the respective axes thereof, the only limitation thereon being that such tubes be capable of being slid over the cage-like, current-conductive structure means 11 of the device.
  • the inner space of the structure 11 can be filled with pressure-transmitting medium, such as water for example.
  • the inner space of the structure 11 is sealed by annular sealing rings 19 fitted in suitable recesses formed at opposite ends of the structure 11.
  • the pressure-transmitting liquid can be supplied to the interior of the structure 11, for example, through a bore 110 formed in the electrode 15, through which the ignition device 17 also extends.
  • the base plate 16 and the cage-like current-conductive structure 11 and the workpiece l8 therewith are electrically connected at ground potential.
  • the base plate 16 is furthermore connected to the ground terminal of a high voltage condenser 111, while the high-voltage terminal of the latter is, in turn, connected through a switch 112, symbolically shown in FIG. 1 as a threeelectrode spark gap, with a connector clamp or clip 114 which is insulated from the base plate 16 by a suitable sheathing 113 while being in electrical contact engagement with the high voltage electrode 15.
  • the discharge of the high voltage condenser 111 is effected by means of an ignition device 17 in the form of a filament having a nonconductive core and a conductive coating thereon then, after a condenser discharge and the conductive coating within the interior space of the structure 11 has been burned away leaving the nonconductive core of the filament 17 within the interior space of the structure 11, the thus-bared core can then be withdrawn through a bore ll5formed in the cover plate 12 and can be severed from that length of the conductively coated filament 17 now disposed within the interior space of the structure 11 so as not to interfere with the introduction to the device of our invention of the next workpiece to be processed.
  • the cage-like currentconductive structure is formed of a bipartite metallic cover plate 22, a plurality of metallic rods or bars 23 and a base member 24 of insulating materialformed with a central bore through which a highvoltage electrode 25 extends.
  • the bars 23 terminate in a metallic base plate 26 and are encircled by a workpiece 28 that is to be processed.
  • the filamentary ignition device 27 is supplied from a roll 21 mounted on the base plate 26 and passes through a bore 29 formed in the base plate 26 and continuing through one of the bars 23 and through the lower part, as viewed in FIG. 2, of the bipartite cover plate 22.
  • This lower part of the cover plate 22 is also formed with a groove connecting the bore 22 with a central bore formed in the center of the lower part of the cover plate 22.
  • the filamentary ignition device 27 thus does not extend above the cover plate 22 but rather only to the upper surface of the lower part of the cover plate 22 and then returns through the groove and central bore formed therein through the interior space of the cage-like structure and through a bore formed in the high-voltage electrode 25.
  • Pressure-transmitting liquid such as water for example
  • a channel 230 formed in the base plate 26 and having an outlet opening 231 located between a pair of the bars 23.
  • the high-voltage electrode 25 and the bore 29 are sealed against leakage of the water under normal pressure conditions.
  • a connector clamp or clip 232 with an insulating jacket connects the highvoltage electrode 25 to the base plate 26 through a switch and condenser in a manner similar to that in which the switch 112 and condenser 111 of FIG. I are connected.
  • the embodiment of FIG. 2 is provided with annular sealing rings 234 serving a similar purpose as the sealing rings 19 of the embodiment shown in FIG.
  • FIG. 3 there is shown an embodiment of the device of our invention wherein the cage-like currentconducting structure 31 is constructed for short spacings of the electrodes 35 and 35 and thereby for a free spark-over between the electrodes.
  • the structure 31 is formed of a metallic cover plate 32, metallic bars 33 and a base 34 consisting of insulating material.
  • the respective parts of the cover plate 32 and the base 34 that extend into the interior water-supplied space of the structure 31 are provided respectively with a central projection 37.
  • the projections 37 in the embodiment of FIG. 3 are of conical shape.
  • the electrodes 35 and 35' are adjustably inserted in suitable aligned bores formed in the cover plate 32 and in the base 34 in order to equalize the burn-off of the electrodes 35 and 35' in the contact regions of the spark-over.
  • the bars 33 are inserted in suitable recesses formed in an electrically conductive base plate 36 which is at ground potential and is connected with the ground terminal of a highvoltage condenser not shown in FIG. 3.
  • the highvoltage side of the nonillustrated high-voltage condenser is connected through a switch, in the manner shown schematically in FIG.
  • Annular sealing rings 39 are provided in a manner similar to the aforedescribed embodiments, and a workpiece 38 is shown introduced into the embodiment of FIG. 3.
  • FIG. 4 shows an embodiment of the device of our invention wherein the cage-like, electrically-conductive structure 41 is adjustable to match the respective processing length.
  • the structure 41 is formed of a metallic cover plate 42, metallic bars 43 and of a base 44 consisting of insulating material.
  • a high-voltage electrode 45 extending through the base 44, a metallic base plate 46, a filamentary ignition device 47 extending through a bore formed in the electrode 45, annular sealing rings 49 suitably disposed in recesses formed in the cover plate 42 and in the base plate 46, respectively, an insulated connector clamp or clip 410 connected to the high-voltage electrode 45, and a tensioning or clamping ring 411 mounted around the bars 43 and located adjacent the base plate 46.
  • a workpiece for example a cylindrical tube, is shown mounted in the device of our invention.
  • the cage-like structure member 41 can be adjusted to different processing lengths, provided that the bars 43 are so formed that they have good sliding, electrically-conductive contact with the base plate 46 and can be firmly adjusted.
  • This can be effected for example by the use of the tensioning or clamping ring 411. Consequently, in an extreme case, such short spacings between the electrodes 42 and 45 are obtainable that even a free spark-over between the deck plate electrode 42 and the high-voltage electrode 45 is possible.
  • FIGS. and So there is shown an embodiment of the device of our invention so constructed as to be used for processing bent or curved tubular members such as tube turns or els.
  • the curved cage-like structure member 51 of the embodiment of our device, shown in FIG. 5, is formed of a metallic cover plate 52, bars 53 and a base 54 ofinsulating material.
  • the bars 53 end in an electrically conductive base plate 56.
  • a high voltage electrode 55 extends through a bore in the base 54, and a filamentary ignition device 57, in turn, extends through a bore formed in the electrode 55 and into the interior of the structure member 51.
  • a curved workpiece 58 is shown installed in the embodiment of FIG. 5, and sealing rings 59 are also provided in this embodiment and serve the same purpose as the corresponding sealing rings employed in the aforedescribed embodiments of the device of the invention.
  • a connector clamp or clip 510 covered by insulation 511 is connected to the high-voltage electrode 55.
  • insulating discs 512 in which respective metal rings 513 are force-fitted.
  • perforations 514 are formed in the discs 512, as shown more clearly in FIG. 5a.
  • the current conducting structure member 51 matches the curvature of the workpiece 58.
  • the perforated discs 512 which have little effect on the pressure formation resulting from the spark-over are disposed at spaced intervals along the curved axis of the structure member 51 so as to provide a curved guidance for the filamentary ignition device 57.
  • the metal rings 513 that are force-fitted into the center holes of the respective discs 512 provide a wear-resistant guiding surface for the ignition device 57 which consists, for example, of a nonconductive filamentary core and a conductive coating applied thereto.
  • the remaining components of the electric discharge circuit for the embodiment of FIG. 5 correspond to those shown schematically in FIG. 1.
  • the pressure-pervious cagelike structure member can also be used when the processing pressure is produced by an underwater explosion for example, instead of a spark-over or a wirevaporization.
  • a cage-like structure member having the same construction as those of the aforedescribed embodiments may be employed, but instead of having no ignition device between the electrodes, as for spark-over, or an ignition device in the form ofa vaporizable wire, there can be provided a cord or strip of explosive material that is stretched between the cover plate and a base which is made of metal instead of insulating material, and the explosive material can accordingly be exploded under water or other pressuretransmitting liquid in a conventional manner by an ignition or firing cable.
  • tubular workpiece there is also meant a workpiece having an axial length that is less than the cross sectional diameter or the smallest cross-sectional dimension of the workpiece.
  • tubular workpiece there is also meant any suitable closed-wall member irrespective of its cross-sectional shape.
  • Device for processing elongated tubular workpieces by subjecting them to pressure waves produced in a liquid medium by spark discharge comprising a discharge circuit including condenser means, and a spark gap formed of a pair of spaced electrodes electrically connected to said condenser means, an ignition device disposed in said spark gap between said electrodes thereof, structure means comprising a plurality of bars connected electrically with one another and being disposed parallel to one another in the form of a cage-like structure coaxially surrounding the spark gap and forming part of said discharge circuit, said structure means being encircleable by a tubular workpiece so that the workpiece surrounds the spark gap, said structure means being pervious to pressure transmitted through a liguid medium receivable therein and generated in the medium by an electrical discharge at the spark gap, at least one of said bars being formed with an elongated bore for feeding said ignition device therethrough.
  • Device for shaping elongated curved tubular workpieces by subjecting them to pressure waves produced in a liquid medium by spark discharge comprising a discharge circuit including condenser means, and a spark gap formed of a pair of spaced electrodes electrically connected to said condenser means, an ignition device disposed in said spark gap between said electrodes thereof, structure means comprising a plurality of members connected electrically with one another and being disposed parallel to one another in the form of a cage-like structure coaxially surrounding the spark gap and forming part of said discharge circuit, said structure means being encircleable by a tubular workpiece so that the workpiece surrounds the spark gap, said structure means being pervious to pressure transmitted through a liquid medium receivable therein and generated in the medium by an electrical discharge at the through.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
US00876773A 1968-11-15 1969-11-14 Device for processing elongated tubular workpieces by pressure waves Expired - Lifetime US3852985A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681809098 DE1809098A1 (de) 1968-11-15 1968-11-15 Vorrichtung zum Bearbeiten langgestreckter,geradlinig oder gekruemmt verlaufender geschlossener Werkstuecke mittels Druckwellen

Publications (1)

Publication Number Publication Date
US3852985A true US3852985A (en) 1974-12-10

Family

ID=5713418

Family Applications (1)

Application Number Title Priority Date Filing Date
US00876773A Expired - Lifetime US3852985A (en) 1968-11-15 1969-11-14 Device for processing elongated tubular workpieces by pressure waves

Country Status (5)

Country Link
US (1) US3852985A (de)
AT (1) AT298206B (de)
CH (1) CH515757A (de)
DE (1) DE1809098A1 (de)
GB (1) GB1292290A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030329A (en) * 1976-07-12 1977-06-21 Viktor Nikolaevich Chachin Device for electrical discharge forming
US20040255463A1 (en) * 2003-06-20 2004-12-23 Kiehl Mark W. Method of manufacturing a vehicle frame component by high velocity hydroforming
US20060108783A1 (en) * 2004-11-24 2006-05-25 Chi-Mou Ni Structural assembly for vehicles and method of making same
WO2008037949A1 (en) * 2006-09-27 2008-04-03 Rolls-Royce Plc Apparatus and method for electric spark peening of gas turbine components
US20120216587A1 (en) * 2009-11-17 2012-08-30 Rolls-Royce Plc Method and an apparatus for prestressing components by electrical discharge
US20120312060A1 (en) * 2011-06-10 2012-12-13 Ford Global Technologies, Llc Method and Apparatus for Pulsed Forming, Punching and Trimming of Tubular Members
US20150033815A1 (en) * 2012-02-29 2015-02-05 "ADM28 s.ar.l." Head of an exploding-wire electrohydraulic discharge device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4635840A (en) * 1980-07-07 1987-01-13 Matija Cenanovic Forming method using an electromagnetically exploded filament
EP0043672B1 (de) * 1980-07-07 1985-05-15 Matija Cenanovic Reparaturverfahren und Vorrichtung für Rohre unter Verwendung eines elektrisch verdampften Drahtes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203212A (en) * 1963-03-01 1965-08-31 Lockheed Aircraft Corp Explosive forming by electrical discharge method and apparatus
US3418835A (en) * 1966-04-26 1968-12-31 Continental Can Co Fluid lubricated electrohydraulic body separating and forming
US3593551A (en) * 1968-09-25 1971-07-20 Continental Can Co Electrohydraulic transducers

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203212A (en) * 1963-03-01 1965-08-31 Lockheed Aircraft Corp Explosive forming by electrical discharge method and apparatus
US3418835A (en) * 1966-04-26 1968-12-31 Continental Can Co Fluid lubricated electrohydraulic body separating and forming
US3593551A (en) * 1968-09-25 1971-07-20 Continental Can Co Electrohydraulic transducers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
High energy Rate Forming; by W. W. Wood; pp. 83 89; October 1963; Tool & Manufacturing Engineer. *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4030329A (en) * 1976-07-12 1977-06-21 Viktor Nikolaevich Chachin Device for electrical discharge forming
US20040255463A1 (en) * 2003-06-20 2004-12-23 Kiehl Mark W. Method of manufacturing a vehicle frame component by high velocity hydroforming
US20060108783A1 (en) * 2004-11-24 2006-05-25 Chi-Mou Ni Structural assembly for vehicles and method of making same
WO2008037949A1 (en) * 2006-09-27 2008-04-03 Rolls-Royce Plc Apparatus and method for electric spark peening of gas turbine components
US20100008786A1 (en) * 2006-09-27 2010-01-14 Rolls-Royce Plc Apparatus and method for electric spark peening of gas turbine components
US8257050B2 (en) 2006-09-27 2012-09-04 Rolls-Royce Plc Apparatus and method for electric spark peening of gas turbine components
US20120216587A1 (en) * 2009-11-17 2012-08-30 Rolls-Royce Plc Method and an apparatus for prestressing components by electrical discharge
US9290825B2 (en) * 2009-11-17 2016-03-22 Rolls-Royce Plc Method and an apparatus for prestressing components by electrical discharge
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
US20150033815A1 (en) * 2012-02-29 2015-02-05 "ADM28 s.ar.l." Head of an exploding-wire electrohydraulic discharge device
US9802237B2 (en) * 2012-02-29 2017-10-31 ADM28 s.ár.l. Head of an exploding-wire electrohydraulic discharge device

Also Published As

Publication number Publication date
DE1809098B2 (de) 1971-01-07
AT298206B (de) 1972-04-25
DE1809098A1 (de) 1970-06-25
GB1292290A (en) 1972-10-11
CH515757A (de) 1971-11-30

Similar Documents

Publication Publication Date Title
US2333213A (en) Static eliminator
US3588576A (en) Spark-gap device having a thin conductive layer for stabilizing operation
US3852985A (en) Device for processing elongated tubular workpieces by pressure waves
US3742301A (en) Corona generator
DE69010899T2 (de) Seismischer generator.
US3559435A (en) Liquid bridge wire
US3697806A (en) Ion generator
US3680397A (en) Method of forming workpieces by means of underwater impact pressure
US3203212A (en) Explosive forming by electrical discharge method and apparatus
US3575631A (en) Electrode for electrohydraulic high-energy-rate metal forming
US9802237B2 (en) Head of an exploding-wire electrohydraulic discharge device
US4187526A (en) Gas-Discharge surge arrester with concentric electrodes
US3360972A (en) Magnetomotive metal working device
US3614440A (en) Gas ionizer devoid of coaxial electrodes
DE1541005C3 (de) Elektronenentladungsvorrichtung
US3418510A (en) Triggered spark gap electric arcing device
GB1378367A (en) Method of and device for the removal of electrostatic charges
US3510713A (en) Method of and appparatus for producing a highly concentrated beam of electrons
EP0403059B1 (de) Hochspannungsschalteranordnung
RU2186648C2 (ru) Устройство для электровзрывной запрессовки труб
SU919222A1 (ru) Электровзрывной патрон многократного действи
US3483340A (en) Overload detector for wire feed system
US2951968A (en) Apparatus for removal of electrostatic charges from the surfaces of materials of lowconductivity by means of a stabilized electrical glow-discharge
FR2173875A1 (en) Plasma gun - cathode insert
SU1081718A2 (ru) Тригатронный разр дник