EP2640167A1 - Electrode à plasma pour un dispositif de coupe au plasma - Google Patents

Electrode à plasma pour un dispositif de coupe au plasma Download PDF

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Publication number
EP2640167A1
EP2640167A1 EP12001761.1A EP12001761A EP2640167A1 EP 2640167 A1 EP2640167 A1 EP 2640167A1 EP 12001761 A EP12001761 A EP 12001761A EP 2640167 A1 EP2640167 A1 EP 2640167A1
Authority
EP
European Patent Office
Prior art keywords
core holder
electrode
cooling tube
core
interior
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP12001761.1A
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German (de)
English (en)
Other versions
EP2640167B1 (fr
Inventor
Manfred Hollberg
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP12001761.1A priority Critical patent/EP2640167B1/fr
Priority to PCT/EP2013/000764 priority patent/WO2013135384A1/fr
Publication of EP2640167A1 publication Critical patent/EP2640167A1/fr
Application granted granted Critical
Publication of EP2640167B1 publication Critical patent/EP2640167B1/fr
Not-in-force legal-status Critical Current
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/28—Cooling arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3423—Connecting means, e.g. electrical connecting means or fluid connections
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3436—Hollow cathodes with internal coolant flow

Definitions

  • the invention relates to a plasma electrode for a plasma cutting device according to the preamble of patent claim 1.
  • Such a plasma electrode is, for example, with the subject of WO 2009/070 362 A1 known. This disclosure is intended to be fully within the scope of the present invention description.
  • said document proposes to arrange a cooling tube in the interior of an approximately hollow-cylindrical electrode body, whose front end face is positioned with a spacer which is inserted at the bottom of the electrode body.
  • the cited document also generally discloses a plasma electrode having a hollow cylindrical electrode body, on the front side of which is arranged in the interior of the electrode, arranged on the front side, central core holder for an electrode core is arranged.
  • the electrode core is z. B. formed as a hafnium core and is held in the electrode-side core holder.
  • a disadvantage of the cited document is that a separate from the electrode body part, namely a spacer must be used, which must be placed as a separate part in the interior of the electrode body, which is associated with a high assembly cost.
  • the invention is therefore the object of developing a plasma electrode for a plasma cutting device and arranged in the interior of the plasma electrode cooling tube so that the assembly and mounting of Cooling tube is much easier. Furthermore, the cooling of the electrode core should be improved.
  • the invention is characterized by the technical teaching of claim 1 and independent claim 11.
  • An essential feature of the invention is that on a separate part, such. B. on a spacer or the like, is dispensed with and instead the cooling tube is fixed with its front, the electrode core side facing directly on the electrode-side core holder for holding the electrode core.
  • This core holder is intended for holding the electrode core and must be cooled because of the high working temperature of the electrode core.
  • the invention relates to a completely new positioning for the mounting of a cooling tube, because until now it was only known, the cooling tube to back stops (s. FIG. 22 the cited document) to be positioned on the electrode body or just on the front side in the electrode body interior spacers arranged, however, which must be introduced as a separate part.
  • the cooling tube at least partially overlaps the electrode-side core holder and, so to speak, is secured in position on the outer circumference of the electrode-side core holder, there is accordingly the advantage that separate holding or layer securing means can be dispensed with.
  • the core holder is designed as a conical body directed into the interior of the electrode body, the conical surfaces of which taper from the bottom of the electrode body in the axial direction to the rear (top).
  • the cooling tube thus centered automatically on the outer circumference of the preferably designed as a cone body core holder.
  • the invention is not limited thereto. It may be provided in a development of the invention that the outer circumference of the cone body forming conical surfaces ring Vietnamese Surprisede centering (or threaded struts) have, so that the end face of the cooling tube rests on such a ring-running step or a circumferential shoulder and receives a defined position assurance.
  • the invention is not limited to cone-shaped core holder for holding the electrode core.
  • the profile of the core holder is initially cylindrical (ie, for example, round cylindrical) and that at least one contact surface for the position-secured holder of the front end side of the cooling tube is produced by a compression deformation.
  • an upset forming tool is placed on the upper end face of the approximately cylindrical core holder, and the previously cylindrical core holder is compressed with a pressing impact in the axial direction, so that at least one of the diameter of the core holder magnifying radially outwardly directed bead results the front end face of the cooling tube is seated and held in position.
  • the front side of the cooling tube on the core holder is a position assurance and the cooling tube is preferably connected to a preferably designed as a screw or plug connection preferably at the rear end of the electrode body with this releasably connected.
  • the invention is concerned only with the front, the position assurance serving holder of the cooling tube to the electrode-side core holder, which also serves to hold the electrode core.
  • cooling tube is detachably connected to the electrode body itself at the rear end is according to a variety of embodiments (Screw, connectors, bayonet and the like) possible.
  • the position assurance of the front end of the cooling tube takes place on the reaching into the interior of the electrode core holder, it must be ensured that the guided in the interior of the cooling tube liquid flow is deflected in the region of the core holder, so in the Area of the position assurance between the front end of the cooling tube and the electrode-side core holder for a leakage of the cooling liquid and a diversion of the cooling liquid must be taken care of.
  • the invention provides according to a further preferred embodiment, that at least one recess leading to the cooling liquid is arranged on the outer circumference of the core holder.
  • the core holder does not sealingly close the front end of the cooling tube, but that in the region of this position assurance one or more, the cooling liquid recesses are present, which are able to forward the guided inside the cooling tube cooling liquid along the core holder and preferably to lead to the annular groove bottom of the electrode body, where the cooling liquid flow is diverted and guided in the interior of the cooling tube cooling liquid is deflected from the interior of the cooling tube in the outer annular gap between the outer surface of the cooling tube and the inner surface of the electrode body.
  • the core holder is not formed as a truncated cone, but as at least one side flattened truncated cone, so that through the flattening thus formed, the coolant flow over the outer periphery of the core holder can reach into the interior of the electrode body.
  • a two-sided flattening which is mirror-symmetrical with respect to the longitudinal center axis of the core holder designed as a truncated cone, is preferred.
  • the invention is not limited to that of the core holder is formed as a flattened truncated cone, which is formed substantially rotationally symmetrical.
  • cooling liquid leading recesses are provided which are able to lead out in the interior of the cooling tube in the axial direction guided coolant in the area of the position assurance of the cooling tube on the core holder from the cooling tube and to introduce into the interior of the electrode body.
  • one or more recesses are arranged parallel to the conical surface of the conical core holder, because this results in particularly favorable flow conditions.
  • the invention is not limited thereto. It can also be used recesses, which are directed at an angle to the conical surface of the conical core holder.
  • the at least one recess arranged in the core holder is designed either as a half-open longitudinal groove or as a half-open bore channel or as a radially outwardly open segment recess.
  • the front end of the cooling tube does not sealingly rests on the outer circumference of the core holder, but that although there is a support, but the cooling tube in this area still radially outwardly directed slots, Has holes or recesses.
  • the directed in the interior of the cooling tube and the electrode end face of the core holder is also flattened, but the electrode core protrudes with an elongated approach into the interior of the cooling tube.
  • This latter embodiment ensures that the electrode core - the cooling of which is crucial - protrudes into the interior of the cooling tube in contact with the liquid, thus providing even better cooling.
  • the surface cooling of the core holder can be decisively improved by enlarging this surface with grooves or boreholes that are open to the outside.
  • the cooling channels which enlarge the surface of the core holder thereby form, preferably in the axial direction are aligned.
  • these cooling channels can also - to further extend the length of the respective cooling channel - also helically, in the manner of threads increase the outer circumference of the core holder.
  • the core holder can in this case be cylindrical or conical in profile or provided with any other profile.
  • a third embodiment relates to the attachment of a thread on the outer circumference of the core holder, which can be done either by a thread cutting or a compression forming.
  • the front end face of the cooling tube is either smooth and uninterrupted or provided with lateral slots or holes.
  • FIGS. 1 to 3 illustrated principle of leadership of the cooling liquid applies to all other embodiments according to the FIGS. 4 to 30 because these are merely modifications of the principle FIGS. 1 to 3 are. Therefore, the same explanations apply to the same parts.
  • the in the FIGS. 1 to 3 illustrated plasma electrode 1 consists of a hollow cylindrical electrode body 2 made of a metal material, preferably a copper alloy or a silver alloy, in the interior of a hollow cylindrical cooling tube 3 is releasably attached.
  • the cooling tube 3 forms in its interior a coolant liquid-conducting channel 4, which is conveyed in the direction of arrow 19 to the front of the cooling tube 3 under pressure.
  • a core holder 5 is integrally formed on the bottom side, in which a -.
  • Hafnium-based electrode core 9 e.g. is held in a press fit.
  • the electrode core 9 is pin-shaped, round cylindrical and in the front end face of the emission surface is formed for the plasma arc.
  • the part of the electrode body 2 forming core holder 5 is formed as a cone body, that is, this body is preferably round cylindrical, as formed by the circular surfaces 25 in FIG. 3 is shown schematically. He forms so a flattened truncated cone, wherein the flattened frustoconical surface forms an end face 22.
  • FIG. 3 is placed on the outer circumference of the cone holder formed as a core holder 5, the front end side of the cooling tube 3 and thus forms an annular stopper 10 which is secured against the outer edge of the core holder 5 and held there.
  • the inside of the cooling tube 3 thus forms the ring stop 10 for resting on the outer surface of the conical surface 7 formed as a lateral surface of the core holder. 5
  • the electrode core 9 is held in a secured position in a frontal bore 8 of the core holder 5.
  • the cooling liquid recesses are provided, wherein in the embodiment of the FIGS. 1 to 5 these, the cooling liquid leading recesses are formed as mirror-symmetrical to each other opposing flats 15 formed as a truncated cone body core holder 5.
  • FIG. 3 illustrated by drawings. It is shown that in itself the surface of the frusto-conical core holder 5 formed as a circular surface 25 is cut off on both sides so as to form the flats 15, which in turn form two mutually opposite annular gaps leading to the cooling liquid.
  • the coolant brought up in the direction of arrow 19 flows parallel to the conical surface 7 through the flattenings in the direction of arrow 19 (see FIG. FIG. 3 ), is at the Ringnutground 13 of Electrod body 2 deflected, and then flows in the opposite direction of arrow 23 on the outer circumference of the cooling tube and the inner circumference of the electrode body 2 through the annular gap 18 back.
  • FIG. 3 shows in this case the cut out of the circular surface 25 on both sides end face 22, in which the rear end of the electrode core 9 protrudes as an electrode core extension 11 into the cooling liquid.
  • FIGS. 6 and 7 show the embodiment of the FIGS. 6 and 7 in that, instead of the use of flats in the cone body of the core holder 5, radially outwardly open longitudinal grooves 17 can be formed, through which the cooling liquid flows.
  • the longitudinal grooves 17 are formed as outwardly open wedge-shaped grooves. Instead of such wedge-shaped grooves also open outwardly semicircular, elliptical or otherwise profiled grooves can be used. Also, the number of grooves is not limited. In addition to a single longitudinal groove 17, a plurality of longitudinal grooves 17 distributed uniformly on the circumference of the formed as a truncated cone core holder 5 may be arranged.
  • FIGS. 8 and 9 show as a further modification of the inventive principle the FIGS. 8 and 9 , where the core holder 5 is formed star-shaped, which means that the longitudinal grooves 17 a relatively large material area of the core holder 5 aus ⁇ and this results in a particularly large, the cooling liquid leading annular gap 16 results.
  • FIGS. 10 and 11 This is also shown by the embodiment FIGS. 10 and 11 , where compared to the embodiment according to FIGS. 8 and 9 Yet another material saving with respect to the material of the core holder 5 and instead of a four-star arrangement after FIG. 9 now a five-star arrangement after FIG. 11 is provided.
  • Such heat sinks were previously known only for convective air cooling of semiconductor devices.
  • the invention proposes a liquid-cooled core holder with an optimally enlarged surface.
  • the longitudinal grooves 17 are preferably achieved by a machining with a milling tool or the like.
  • drilling channels 21 are introduced with a suitable drilling tool.
  • FIG. 13 shows FIG. 13 in that a total of four drilling channels 21 arranged opposite one another and distributed uniformly around the circumference lead to a decisive increase in the surface area of the outer circumference of the core holder 5, so that the core holder is cooled optimally.
  • FIG. 15 shows that a plurality of drill channels 21 can be introduced evenly distributed around the circumference
  • FIGS. 16 and 17 show that even essential material of the core holder 5 can be saved by this is only formed on one side and only on one side of the radial inner circumference of the cooling tube 3 secures, while the other, opposite inner circumference of the cooling tube 3 is exposed. This ensures optimal guidance of the coolant, without flow resistance.
  • FIG. 2 illustrated bilateral flattening now extends as it were over an angle of 270 degrees according to the embodiment FIG. 17 ,
  • the embodiment according to the FIGS. 18 and 19 in that the flattening can also extend over an angle of 180 degrees so as to give an annular gap 28 extending over a circle angle of 180 degrees.
  • FIGS. 20 and 21 show in deviation from the embodiment according to FIG. 2 in that, in addition to the two opposing flattenings 15, also opposing drill channels 21 can be introduced so as to ensure optimum guidance of the cooling liquid.
  • the end face 20 of the cooling tube 3 (s. FIG. 1 ), however, does not necessarily rest on the inside of the outer circumference of the core holder 5 designed as a truncated cone.
  • this end face on assigned, annular and over the outer circumference of the core holder extending, semi-open annular grooves, so that the entire end face 20 then rests flush in the arranged on the outer circumference of the core holder 5 annular groove.
  • an additional or more additional drilling channels 21 may be arranged.
  • FIGS. 24 and 25 show that two or more drill channels 21 can be arranged in the one-sided asymmetrically designed core holder 5.
  • FIGS. 26 and 27 is shown that in an asymmetric core holder and three drill channels can be arranged so that all unilateral Embodiments of the frustoconical core holder at least one one-sided segment recess 24 is present, which extends over any circumferential angle of z. B. 60, 90, 180 or 270 degrees can extend.
  • the longitudinal axis 27 of the cooling tube 3 is held decentered in the core holder 5.
  • the core holder 5 can also be formed on one side and asymmetrically, then it can be provided that additional centering means are provided in the opposite, exposed part of the core holder, where there is no contact with the cooling tube.
  • FIG. 28 In the embodiment according to FIG. 28 is shown that the deformation of a round cylindrical core holder 5 is carried out with a compression tool 29. It is not necessary for the solution that the core holder 5 is formed as a cone body, as was described in the previous embodiments.
  • the upsetting tool 29 On the front side of the cylindrical core holder 5, the upsetting tool 29 is placed so that the compression head 30 engages over the upper end face 22 of the core holder 5.
  • the punch 32 of the swaging head 30 rests on this end face 22.
  • By a pressure impact in the direction of arrow 35 of the core holder 5 is compressed and forms a radial, diameter-increasing bead 33 according to FIG. 29 out.
  • This bead 33 is the bearing surface for the front end side of the cooling tube. 3
  • the upset head 30 still lateral bevels 31 are formed, which form between them rib-shaped, obliquely outwardly directed grooves.
  • the bevels 31 deform the upper side surfaces of the core holder 5 during upsetting and thus simultaneously form radially and obliquely outwardly directed flats 15 or longitudinal grooves 17.
  • cooling ducts which are opened outwards are designed to guide the cooling medium over the surface of the core holder which is thus enlarged.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)
EP12001761.1A 2012-03-15 2012-03-15 Electrode à plasma pour un dispositif de coupe au plasma Not-in-force EP2640167B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12001761.1A EP2640167B1 (fr) 2012-03-15 2012-03-15 Electrode à plasma pour un dispositif de coupe au plasma
PCT/EP2013/000764 WO2013135384A1 (fr) 2012-03-15 2013-03-14 Électrode à plasma pour dispositif de découpage par plasma

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12001761.1A EP2640167B1 (fr) 2012-03-15 2012-03-15 Electrode à plasma pour un dispositif de coupe au plasma

Publications (2)

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EP2640167A1 true EP2640167A1 (fr) 2013-09-18
EP2640167B1 EP2640167B1 (fr) 2018-02-14

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EP12001761.1A Not-in-force EP2640167B1 (fr) 2012-03-15 2012-03-15 Electrode à plasma pour un dispositif de coupe au plasma

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EP (1) EP2640167B1 (fr)
WO (1) WO2013135384A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017180550A1 (fr) * 2016-04-11 2017-10-19 Hypertherm, Inc. Système de découpage à l'arc, comprenant des tubes de fluide de refroidissement et autres consommables, et procédés de fonctionnement associés

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5416296A (en) * 1994-03-11 1995-05-16 American Torch Tip Company Electrode for plasma arc torch
US6362450B1 (en) * 2001-01-30 2002-03-26 The Esab Group, Inc. Gas flow for plasma arc torch
US20040200810A1 (en) * 2003-04-11 2004-10-14 Hypertherm, Inc. Method and apparatus for alignment of components of a plasma arc torch
US20080093346A1 (en) * 2006-10-18 2008-04-24 Komatsu Ltd. Plasma cutting device, plasma torch, and cooling device for plasma torch
US20080116179A1 (en) * 2003-04-11 2008-05-22 Hypertherm, Inc. Method and apparatus for alignment of components of a plasma arc torch
EP1933607A1 (fr) * 2006-12-13 2008-06-18 L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Torche de coupage plasma avec circuit de refroidissement à tube plongeur adaptatif
DE102009059108A1 (de) * 2009-12-18 2011-06-22 Holma Ag Elektrode mit Kühlrohr für eine Plasmaschneidvorrichtung
WO2012074591A1 (fr) * 2010-12-01 2012-06-07 The Esab Group, Inc. Électrode pour chalumeau au plasma avec procédé d'assemblage nouveau et transfert de chaleur amélioré

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5416296A (en) * 1994-03-11 1995-05-16 American Torch Tip Company Electrode for plasma arc torch
US6362450B1 (en) * 2001-01-30 2002-03-26 The Esab Group, Inc. Gas flow for plasma arc torch
US20040200810A1 (en) * 2003-04-11 2004-10-14 Hypertherm, Inc. Method and apparatus for alignment of components of a plasma arc torch
US20080116179A1 (en) * 2003-04-11 2008-05-22 Hypertherm, Inc. Method and apparatus for alignment of components of a plasma arc torch
US20080093346A1 (en) * 2006-10-18 2008-04-24 Komatsu Ltd. Plasma cutting device, plasma torch, and cooling device for plasma torch
EP1933607A1 (fr) * 2006-12-13 2008-06-18 L'AIR LIQUIDE, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Torche de coupage plasma avec circuit de refroidissement à tube plongeur adaptatif
WO2009070362A1 (fr) 2007-11-27 2009-06-04 Hypertherm, Inc. Procédé et dispositif pour aligner des composants d'un chalumeau à arc de plasma
DE102009059108A1 (de) * 2009-12-18 2011-06-22 Holma Ag Elektrode mit Kühlrohr für eine Plasmaschneidvorrichtung
WO2012074591A1 (fr) * 2010-12-01 2012-06-07 The Esab Group, Inc. Électrode pour chalumeau au plasma avec procédé d'assemblage nouveau et transfert de chaleur amélioré

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017180550A1 (fr) * 2016-04-11 2017-10-19 Hypertherm, Inc. Système de découpage à l'arc, comprenant des tubes de fluide de refroidissement et autres consommables, et procédés de fonctionnement associés
US10129969B2 (en) 2016-04-11 2018-11-13 Hypertherm, Inc. Arc cutting system, including coolant tubes and other consumables, and related operational methods

Also Published As

Publication number Publication date
WO2013135384A1 (fr) 2013-09-19
EP2640167B1 (fr) 2018-02-14

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