EP2829162B1 - Électrode à plasma pour une torche à plasma d'arc avec extrémité d'électrode échangeable - Google Patents

Électrode à plasma pour une torche à plasma d'arc avec extrémité d'électrode échangeable Download PDF

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Publication number
EP2829162B1
EP2829162B1 EP13714852.4A EP13714852A EP2829162B1 EP 2829162 B1 EP2829162 B1 EP 2829162B1 EP 13714852 A EP13714852 A EP 13714852A EP 2829162 B1 EP2829162 B1 EP 2829162B1
Authority
EP
European Patent Office
Prior art keywords
electrode
plasma
electrode tip
tip
screw
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.)
Not-in-force
Application number
EP13714852.4A
Other languages
German (de)
English (en)
Other versions
EP2829162A1 (fr
Inventor
Manfred Hollberg
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.)
HOLLBERG, MANFRED
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Individual
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Filing date
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Priority to EP13714852.4A priority Critical patent/EP2829162B1/fr
Publication of EP2829162A1 publication Critical patent/EP2829162A1/fr
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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
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3436—Hollow cathodes with internal coolant flow
    • 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
    • H05H1/3442—Cathodes with inserted tip

Definitions

  • the invention relates to a plasma electrode for a plasma arc burner, comprising an electrode body which has at least one electrode core arranged on the electrode tip.
  • Such plasma electrodes for use in plasma arc torches have become known in various embodiments.
  • the JP 2007-180028 A or the EP 1 765 046 B1 or the DE000069937323T2 directed.
  • the wear of the plasma electrode during operation is considerable.
  • the electrode core inserted into the front side of the plasma electrode in the region of the electrode tip in a bore generates a plasma arc at temperatures in the range between 1,000 to 2,000 degrees Celsius and consists of an electrically conductive, highly emissive material, e.g. Hafnium or zirconium.
  • the electrode tip is heavily stressed by the high firing temperatures.
  • material erosion occurs on the electrode core which deposit as splashes of material on the electrode tip and its surroundings, which leads to undesirable wear and a limitation of the service life.
  • the EP 1 633 172 A2 suggests the electrode core, which consists of a hafnium material, in an existing silver insert on the Hold electrode tip. This insert (see FIG. 7 ) is soldered into the front area of the electrode tip.
  • the invention is therefore based on the object, a plasma electrode for a plasma arc burner of the type mentioned in such a way that a more easy and cost-effective replacement of the electrode is possible during wear.
  • the invention is characterized by the technical teaching of claim 1.
  • the invention is based on the assumption that the electrode consisting of a high-grade material (eg AG) has at least two parts and only the front, exchangeable tip part consists of a high-quality material (such as AG), whereas the rear electrode part consists of one less high quality material, such as Cu or a Cu alloy or a comparable material may exist.
  • a high-grade material eg AG
  • the front, exchangeable tip part consists of a high-quality material (such as AG)
  • the rear electrode part consists of one less high quality material, such as Cu or a Cu alloy or a comparable material may exist.
  • the division of the electrode according to the invention is particularly useful for electrodes from a total length of more than 10-12 mm.
  • the division into two is such that the replaceable tip has a length of, for example, 6 mm, while the remaining, rear electrode part makes up the remaining length.
  • a bipartition is especially with longer electrodes with a total length of e.g. 40 mm or more.
  • the plasma electrode is formed at least in two parts and at least consists of the front electrode tip and a rear electrode part and that the electrode tip is replaceably held on the electrode part.
  • the invention provides for a multi-part plasma electrode, wherein the simpler description is based in the following description of only two parts of this plasma electrode, although the plasma electrode can also consist of more than two parts.
  • the description of a bipartite plasma electrode is therefore not intended to limit the scope of the invention.
  • An essential feature of the invention is that in a two-part design of the plasma electrode is now possible to solve the front part of the rear part, because these two parts are preferably releasably connected to each other.
  • the front electrode tip can be removed with the electrode core introduced there from the rear electrode portion of the plasma electrode, provided that wear on the electrode tip occurs.
  • the detachable connection between the two parts of the plasma electrode is designed as a screw connection, as a plug-in connection or as a combined screw-type connector.
  • the screw consists of two interlocking threads.
  • At the electrode tip can be an internal thread be arranged, which can be screwed into an associated external thread in the region of the rear electrode portion of the plasma electrode.
  • the electrode tip has an external thread which can be screwed onto an associated internal thread of the rear electrode part of the plasma electrode.
  • a plug connection is used, such.
  • a bayonet connector that can be solved and fixed by a rotary-plug movement.
  • the detachable connection between the two parts of the plasma electrode consists of a sealed flange, wherein two oppositely disposed flanges on the two parts associated with each other and are liquid-tightly sealed from each other.
  • a flange connection is secured by a union nut in connection with a thread on the opposite part.
  • clamping connections are also provided.
  • Such a clamp connection is z.
  • the rear electrode portion of the plasma electrode is made of a low-cost copper material or a copper alloy, while the front portion of the electrode tip, which is subject to wear, consists of a silver material or a silver alloy.
  • the electrode tip is made of high-quality silver or a silver alloy.
  • silver as a highly conductive material has been given by way of example only. Of course, other highly conductive, readily processable materials can be used which have the properties of silver. In particular tin alloys come into consideration or copper-tin alloys (bronze).
  • the abovementioned materials can be used in the same abovementioned material pairings as have been specified above using the example of the material Ag.
  • the invention is not limited to hollow cylindrical plasma electrodes, in the interior of which a cooling tube is arranged, with which a cooling medium - preferably water - introduced into the interior of the plasma electrode, is diverted at the front end, in the vicinity of the electrode tip, and then out again the plasma electrode is led out.
  • a cooling medium - preferably water - introduced into the interior of the plasma electrode is diverted at the front end, in the vicinity of the electrode tip, and then out again the plasma electrode is led out.
  • the invention also claims uncooled hollow cylindrical or also consisting of solid material plasma electrodes, which are at least two parts and the front part subject to wear is easily detachably connected to the rear part.
  • plasma electrode 1 is constructed in two parts and consists of the front, replaceable electrode tip 2 and a rear electrode part 3, which is centered with a radially outer mounting flange 7 on the inside of a fastening body (electrode holder), not shown, and otherwise with a thread 8 can be screwed into such a fastening body.
  • the entire plasma electrode 1 can be inserted sealed in a fastening body, not shown.
  • a cooling tube 6 is arranged centrally, which engages with its front end in a receiving space 5 in the region of the electrode tip 2.
  • An electrode core 4 is inserted in a bore of the electrode tip 2 is made of a highly-emissive material, such. A hafnium or zirconium material.
  • the cooling of the plasma electrode takes place in such a way that a coolant flow is introduced into the interior 10 of the cooling tube 6, which is deflected in the region of the receiving space 5 in the electrode tip 2 and is then recirculated via the radially outer inner bore 9.
  • connection portion 11 of the detachable connection consists of a screw thread.
  • a screw thread 12 is formed.
  • opposing and rectified conical surfaces 13, 14 are arranged on associated flanges of the electrode tip 2 and the electrode member 3 and that further engages a preferably encircling annular flange 15 on the electrode member 3 in an associated annular groove 16 and there centered.
  • FIG. 3 shows the composite structure of in FIG. 1 in the disassembled state shown plasma electrode, where it can be seen that the front, replaceable electrode tip 2 has a relatively short length 24 which is many times shorter than comparatively the non-replaceable electrode part 3 with a much greater length 25th
  • the aspect ratios of these two lengths 24, 25 can range from 1: 1 to 1: 6.
  • the electrode tip 2 is easily detachably mounted on the electrode-side electrode part 3 and therefore is easily replaceable when it is worn. It is kept short to keep material consumption low during replacement.
  • FIGS. 5 to 8 show the kinematic reversal of a numeral 12 in the FIGS. 1 to 4 shown screw thread.
  • the screw thread 12 from a on the inside of the electrode tip. 2 arranged internal thread, which is screwed into an associated, radially outwardly directed external thread on the electrode part 3.
  • the threaded screw connection is sealed by a sealing ring 19 liquid-tight.
  • FIGS. 7 and 8 show another embodiment of the screw, and the rest, that in the area of the electrode tip 2 also a key surface 20 may be provided for the attack of a suitable tool with which the electrode tip 2 can be unscrewed from the electrode part 3.
  • an external thread is arranged on the rear side of the electrode tip 2, which cooperates with an internal thread in the interior of the electrode member 3 and the entire threaded connection is sealed liquid-tight by a sealing ring 19 which is inserted in an associated annular groove 23 on the vertical flange of the electrode tip 2 ,
  • the external thread 21 on the electrode tip 2 thus cooperates with the internal thread 22 on the electrode part 3 as a screw thread 12.
  • FIGS. 9 to 12 show as a further embodiment, a plasma electrode in which the sealing ring 19 is integrally formed in the region of an outwardly open annular groove 23 at the foot of the vertical flange in the electrode part 3.
  • the electrode tip 2 has an internal thread 22, which with the associated external thread 21 results in the sealed screw connection in the region of the connection part 11.
  • FIGS. 11 and 12 show the in FIGS. 9 to 10 Threaded connection shown in the screwed state.
  • FIG. 13 shows the state of the art according to the DE000069937323T2 and FIG. 2
  • This document shows a screwed into a holder electrode 16 which is integrally formed and must be replaced when worn as an entire part.
  • the electrode 16 is screwed with an upper screw thread 19 in a holder.
  • the invention is now compared to this prior art is to form the known electrode 16 in two parts and form the front tip as easily replaceable electrode tip 2 and the rear part of the electrode 16 as an electrode part of the electrode body of the plasma electrode.
  • FIG. 14 (Prior art according to the EP 1 765 046 B1 ) shows a replaceable, one-piece electrode 2 of considerable length, which corresponds in principle to the embodiment of the electrode according to the invention.
  • the matching features are the upper thread and two annular grooves, in each of which an O-ring is inserted in order to screw the electrode sealed in an electrode holder can.
  • the invention now provides that the in FIG. 14 shown electrode at the lowest point - is divided about the level of reference numeral 3 and there forms the replaceable electrode tip.
  • the electrode tip thus formed only needs to be formed so long that the mounting surfaces to be arranged there and the electrode core can be arranged.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma Technology (AREA)
  • Arc Welding In General (AREA)

Claims (10)

  1. Electrode à plasma (1) pour une torche à arc de plasma composée d'un corps d'électrode qui se compose d'une pointe d'électrode avant (2) sur laquelle est disposé un noyau d'électrode (4), et de la partie d'électrode tubulaire qui fait suite à ladite pointe (2), ladite partie d'électrode comportant une bride de fixation (7) et un filetage (8) ou une douille d'emboîtement pour une fixation dans un porte-électrode,
    caractérisée en ce que la pointe d'électrode est au moins en deux parties et se compose d'une pointe d'électrode avant (2) et d'une pointe d'électrode arrière (3), en ce que la pointe d'électrode avant (2) est fixée à la pointe d'électrode arrière (3) de manière à pouvoir être échangée, et en ce qu'une liaison amovible est disposée entre la pointe d'électrode avant (2) et la pointe d'électrode arrière (3) qui fait suite à celle-ci.
  2. Electrode à plasma selon la revendication 1, caractérisée en ce que la liaison amovible entre la pointe avant (2) et la pointe arrière (3) de l'électrode à plasma (1) est conçue comme une liaison étanche par vissage ou par emboîtement ou par vissage et emboîtement (11).
  3. Electrode à plasma selon la revendication 2, caractérisée en ce que la liaison étanche par vissage ou par emboîtement ou par vissage et emboîtement (11) est conçue avec un centrage automatique.
  4. Electrode à plasma selon l'une des revendications 1 à 3, caractérisée en ce que le rapport de longueur (24, 25) entre la pointe d'électrode avant échangeable (2) et la pointe d'électrode arrière (3) est situé dans la plage entre 1:6 à 1:1.
  5. Electrode à plasma selon l'une des revendications 1 à 4, caractérisée en ce que le matériau de la pointe d'électrode avant (2) et de la pointe d'électrode arrière (3) est du même type.
  6. Electrode à plasma selon l'une des revendications 1 à 4, caractérisée en ce que le matériau de la pointe d'électrode avant (2) et de la pointe d'électrode arrière (3) est de types différents.
  7. Electrode à plasma selon l'une des revendications 1 à 6, caractérisée en ce que la liaison amovible entre la pointe avant (2) et la pointe arrière (3) de l'électrode à plasma (1) est conçue comme une liaison étanche par bride, avec un écrou-raccord pour fixer et bloquer la liaison par bride.
  8. Electrode à plasma selon l'une des revendications 1 à 7, caractérisée en ce que l'électrode à plasma (1) est conçue comme un corps métallique cylindrique creux dans l'espace intérieur (10) duquel est disposé un tube de refroidissement (6).
  9. Electrode à plasma selon l'une des revendications 1 à 7, caractérisée en ce qu'il est prévu sur la circonférence extérieure de la pointe d'électrode arrière (3) des saillies de vissage et/ou d'emboîtement pour la fixation de l'électrode à plasma (1) dans un corps de torche.
  10. Electrode à plasma selon l'une des revendications 1 à 9, caractérisée en ce que la pointe d'électrode avant (2), au moins, se compose d'un matériau plein.
EP13714852.4A 2012-03-23 2013-03-22 Électrode à plasma pour une torche à plasma d'arc avec extrémité d'électrode échangeable Not-in-force EP2829162B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13714852.4A EP2829162B1 (fr) 2012-03-23 2013-03-22 Électrode à plasma pour une torche à plasma d'arc avec extrémité d'électrode échangeable

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP12002077.1A EP2642832A1 (fr) 2012-03-23 2012-03-23 Électrode à plasma pour une torche à plasma d'arc avec extrémité d'électrode échangeable
PCT/EP2013/000876 WO2013139484A1 (fr) 2012-03-23 2013-03-22 Électrode à plasma pour torche à plasma à arc transféré à embout d'électrode interchangeable
EP13714852.4A EP2829162B1 (fr) 2012-03-23 2013-03-22 Électrode à plasma pour une torche à plasma d'arc avec extrémité d'électrode échangeable

Publications (2)

Publication Number Publication Date
EP2829162A1 EP2829162A1 (fr) 2015-01-28
EP2829162B1 true EP2829162B1 (fr) 2017-05-17

Family

ID=48050654

Family Applications (2)

Application Number Title Priority Date Filing Date
EP12002077.1A Withdrawn EP2642832A1 (fr) 2012-03-23 2012-03-23 Électrode à plasma pour une torche à plasma d'arc avec extrémité d'électrode échangeable
EP13714852.4A Not-in-force EP2829162B1 (fr) 2012-03-23 2013-03-22 Électrode à plasma pour une torche à plasma d'arc avec extrémité d'électrode échangeable

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP12002077.1A Withdrawn EP2642832A1 (fr) 2012-03-23 2012-03-23 Électrode à plasma pour une torche à plasma d'arc avec extrémité d'électrode échangeable

Country Status (3)

Country Link
US (1) US9736916B2 (fr)
EP (2) EP2642832A1 (fr)
WO (1) WO2013139484A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109079294B (zh) * 2018-10-31 2023-08-11 浙江巨化装备制造有限公司 全自动管板焊机枪头连续自动钨棒更换装置及更换方法
WO2020206429A1 (fr) * 2019-04-04 2020-10-08 Hypertherm, Inc. Consommables à longueur ajustable pour chalumeau à plasma refroidi par liquide
CZ202054A3 (cs) 2020-02-05 2021-03-03 B&Bartoni, spol. s r.o. Sestava elektrody pro plazmový obloukový hořák se zlepšeným přenosem elektrického proudu

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5216221A (en) * 1992-01-17 1993-06-01 Esab Welding Products, Inc. Plasma arc torch power disabling mechanism
US5440094A (en) * 1994-04-07 1995-08-08 Douglas G. Carroll Plasma arc torch with removable anode ring
US6020572A (en) * 1998-08-12 2000-02-01 The Esab Group, Inc. Electrode for plasma arc torch and method of making same
US6498316B1 (en) * 1999-10-25 2002-12-24 Thermal Dynamics Corporation Plasma torch and method for underwater cutting
US7081597B2 (en) 2004-09-03 2006-07-25 The Esab Group, Inc. Electrode and electrode holder with threaded connection
US8101882B2 (en) 2005-09-07 2012-01-24 Hypertherm, Inc. Plasma torch electrode with improved insert configurations
US7256366B2 (en) 2005-12-21 2007-08-14 The Esab Group, Inc. Plasma arc torch, and methods of assembling and disassembling a plasma arc torch
US9662747B2 (en) * 2006-09-13 2017-05-30 Hypertherm, Inc. Composite consumables for a plasma arc torch
DE102008062731C5 (de) * 2008-12-18 2012-06-14 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Elektrode für einen Plasmabrenner
DE102009016932B4 (de) * 2009-04-08 2013-06-20 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Kühlrohre und Elektrodenaufnahme für einen Lichtbogenplasmabrenner sowie Anordnungen aus denselben und Lichtbogenplasmabrenner mit denselben
US8884179B2 (en) 2010-07-16 2014-11-11 Hypertherm, Inc. Torch flow regulation using nozzle features
US9211603B2 (en) * 2012-01-31 2015-12-15 The Esab Group, Inc. Plasma gouging torch and angled nozzle therefor

Also Published As

Publication number Publication date
US20140291303A1 (en) 2014-10-02
EP2829162A1 (fr) 2015-01-28
WO2013139484A1 (fr) 2013-09-26
EP2642832A1 (fr) 2013-09-25
US9736916B2 (en) 2017-08-15
WO2013139484A4 (fr) 2013-11-21

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