EP1542514A2 - Umlenkdüse für Lichtbogen-Plasmabrenner - Google Patents

Umlenkdüse für Lichtbogen-Plasmabrenner Download PDF

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Publication number
EP1542514A2
EP1542514A2 EP04300848A EP04300848A EP1542514A2 EP 1542514 A2 EP1542514 A2 EP 1542514A2 EP 04300848 A EP04300848 A EP 04300848A EP 04300848 A EP04300848 A EP 04300848A EP 1542514 A2 EP1542514 A2 EP 1542514A2
Authority
EP
European Patent Office
Prior art keywords
nozzle
plasma
diameter
nozzle according
profile
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.)
Withdrawn
Application number
EP04300848A
Other languages
English (en)
French (fr)
Inventor
M. Michel Delzenne
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.)
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Lincoln Electric Company France SA
Original Assignee
La Soudure Autogene Francaise
Air Liquide SA
LAir Liquide SA a Directoire et Conseil de Surveillance pour lEtude et lExploitation des Procedes Georges Claude
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 La Soudure Autogene Francaise, Air Liquide SA, LAir Liquide SA a Directoire et Conseil de Surveillance pour lEtude et lExploitation des Procedes Georges Claude filed Critical La Soudure Autogene Francaise
Publication of EP1542514A2 publication Critical patent/EP1542514A2/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • 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
    • H05H1/3478—Geometrical details

Definitions

  • the present invention relates to a baffle nozzle for a cutting torch plasma.
  • a plasma cutting torch generally comprises at least one nozzle ejecting the plasma arc to the workpiece to be cut, a cathode electrode, placed at a distance from the nozzle and coaxially with it, feed means at less a plasma gas generally chosen according to the nature and thickness of the material to be cut, and at least one means for distributing plasma gas in the volume or plasmagene chamber separating the electrode from the nozzle.
  • the cathode of the torch and the anode formed by the workpiece to be cut are connected at the negative and positive terminals, respectively, of a current generator.
  • a plasma arc is lit on the electrode of the torch in a suitable plasmagenic gas medium, it stretches under the thrust of said gas plasmagen through the nozzle (s) through the central orifice thereof and closes on the where, because of the thermal and kinetic characteristics of the plasma jet, it generates a localized melting of the material forming the workpiece and ejection of the molten metal thereby forming a drilling over the entire thickness then, by relative displacement between the torch and the part, a cutting groove which determines, by coordinated movements in the X and Y directions, the profile of the final piece.
  • the nozzles used in plasma cutting have, opposite of the work piece, a camuse-shaped end protruding from the headdress of maintenance, as illustrated by way of non-limiting example by the nozzle 3 of Figure 1a and the nozzle 7 of Figure 1b.
  • This form is generally composed of a succession of connections flat surfaces and volumes of revolution, such as truncated cones with straight generators sometimes connected to each other by means of general rounded.
  • nozzles are blocked in position, in a housing made at the end of the torch body, via a terminal cap fixed on the end of the torch body, as shown schematically by the caps 5 of Figures 1a and 1 b.
  • the outer profile of the cap 5 and the outer profile of the nozzle 3, 7 form usually in the area of their connection a change of slope, a recess or a profile projection forming a re-entrant angle, as represented by the angles 6 of Figures 1a and 1b, over the entire periphery of the end of the torch nose.
  • the front end of the torch formed by the end of the nozzle is brought close to the surface of the part, the plasma arc ignited on the torch electrode closes on the surface of the room, having crossed the canal ejection of the nozzle.
  • the impact of the plasma jet on the workpiece then causes a local fusion of the constituent material of the part, first superficial, according to the energy delivered by the plasma jet and the thickness of the piece, deeper and deeper until completely open through the opposite side of the workpiece, as shown on FIGS. 2a to 2d showing the torches of FIGS. 1a and 1b, respectively, during a drilling operation, followed by a cutting operation.
  • the deposits 12, in the re-entrant angle 6, not only damage the cap but also attach to the connection with the nozzle, which can prevent or interfere with the disassembly of the cap, during a nozzle replacement operation; to compromise the necessary sealing between cap and nozzle to prevent leakage of cooling water or gas depending on the case; and oppose a correct reassembly of the cap on the nozzle, after the maintenance operation.
  • the problem to be solved is therefore to propose a nozzle for a plasma torch not having the aforementioned problems and disadvantages, that is to say, in particular propose a nozzle having an increased lifetime compared to conventional nozzles, when implemented under the same operating conditions, so as to allow to achieve a greater number of piercing than with the nozzles of the prior art, without noticeable accumulation at its end of expelled metal from the piercing crater, and double arc formation detrimental to the smooth running of cutting operations.
  • the solution of the invention is then a nozzle for a plasma torch, in particular a plasma cutting torch, whose body has a general shape of revolution cup and comprises an outlet orifice of the plasma gas jet, comprising a first external face of circular shape and diameter d2 comprising, in its center, the axial orifice for passage of the jet of plasma, and a second external annular surface, of external diameter d3, bordering peripherally the first face, with d3> d2, characterized in that said second outer annular surface has a concave profile of revolution.
  • the invention also relates to a plasma cutting torch comprising a nozzle according to the invention, as well as on the use of such a nozzle or torch in a plasma arc cutting operation.
  • the inventor of the present invention has shown that by changing the end geometry of the plasma jet ejection nozzle, virtual elimination was achieved disadvantages stated above.
  • the geometry proposed in the context of the invention is advantageously applicable to any plasma cutting nozzle whatever the use, namely manual cutting or automatic, whatever the applications, namely cutting steel steels construction, stainless steels, aluminum alloys or any other material likely to be cut by a plasma cutting process, regardless of the fluid plasmagene, liquid, gas or gas mixtures, oxidizing or non-oxidising, neutral or chemically active, for example reductive, and whatever the power of the plasma jet.
  • FIG. 3 shows an example of a nozzle 14 according to the invention intended to be trapped and maintained coaxially in a cap 5 for maintaining position in a torch body not shown.
  • the holding cap 5 has an end profile 16 of generally frustoconical shape and the nozzle 14 has an end, of generally camuse shape, in axial excess of the cap 5 height H.
  • the camuse end of the nozzle 14 is equipped, starting from its diameter d2 to its diameter d3, an intermediate connecting surface 17 of profile concave revolution forming deflector for metal particles at high temperature, that is to say close to the melting temperature of their constituent material, coming from the workpiece, during the drilling operation, as previously described.
  • nozzles produced according to the present invention and used in place of nozzles of the prior art in plasma cutting torches, under conditions normal use, allow to practice a high number of piercing, about 10 to 20 more than with the nozzles of the prior art, without significant accumulation of metal expelled from the piercing crater towards their end or formation of double bow detrimental to the good running of the cutting operations.
  • the table below indicates sizing values of the end of some nozzles in accordance with the present invention, having led to a high number of holes, that is to say 10 at 20 times greater than with a nozzle according to the prior art, without damage or loss of cutting performance.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Geometry (AREA)
  • Plasma Technology (AREA)
  • Arc Welding In General (AREA)
EP04300848A 2003-12-12 2004-12-06 Umlenkdüse für Lichtbogen-Plasmabrenner Withdrawn EP1542514A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0351043 2003-12-12
FR0351043A FR2863817A1 (fr) 2003-12-12 2003-12-12 Tuyere a deflecteur pour torche a l'arc plasma

Publications (1)

Publication Number Publication Date
EP1542514A2 true EP1542514A2 (de) 2005-06-15

Family

ID=34508783

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04300848A Withdrawn EP1542514A2 (de) 2003-12-12 2004-12-06 Umlenkdüse für Lichtbogen-Plasmabrenner

Country Status (4)

Country Link
US (1) US20050133484A1 (de)
EP (1) EP1542514A2 (de)
CA (1) CA2487970A1 (de)
FR (1) FR2863817A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2393343A3 (de) * 2008-03-12 2013-05-29 Hypertherm, Inc Vorrichtung und Verfahren für eine flüssigkeitsgekühlte Abschirmung für verbesserte Durchstechleistung
US8772667B2 (en) 2007-02-09 2014-07-08 Hypertherm, Inc. Plasma arch torch cutting component with optimized water cooling
US8829385B2 (en) 2007-02-09 2014-09-09 Hypertherm, Inc. Plasma arc torch cutting component with optimized water cooling
US9789561B2 (en) 2008-03-12 2017-10-17 Hypertherm, Inc. Apparatus and method for a liquid cooled shield for improved piercing performance
CN110087381A (zh) * 2011-03-25 2019-08-02 伊利诺斯工具制品有限公司 具有改进的等离子喷嘴的等离子体喷枪系统

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8513565B2 (en) * 2008-04-10 2013-08-20 Hypertherm, Inc. Nozzle head with increased shoulder thickness
CN102361530A (zh) * 2011-09-29 2012-02-22 北京航空航天大学 一种水冷等离子体射流保护罩
US9795024B2 (en) 2013-05-23 2017-10-17 Thermacut, K.S. Plasma arc torch nozzle with curved distal end region
US20160107260A1 (en) * 2014-01-13 2016-04-21 Camarc Llc Welding nozzle of a welding torch
US20150196977A1 (en) 2014-01-13 2015-07-16 Camarc Llc Electrode and method changing an electrode to a welding torch
MY182688A (en) * 2015-01-22 2021-01-29 Chia Sern Chan Non-thermal soft plasma cleaning system

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE685455C (de) * 1934-02-11 1939-12-18 Siemens Schuckertwerke Akt Ges Lichtbogengeblaese
FR1241814A (fr) * 1959-08-11 1960-09-23 Snecma Perfectionnements aux chambres d'ionisation de générateurs de plasma à haute température
US4023006A (en) * 1971-11-06 1977-05-10 Rolls-Royce (1971) Limited Plasma arc welding method
JPS53142927A (en) * 1977-05-20 1978-12-13 Riyouichi Kasagi Metal melting and injection method that does not generate contraction and distortion to film and its device
US4389559A (en) * 1981-01-28 1983-06-21 Eutectic Corporation Plasma-transferred-arc torch construction
US5695662A (en) * 1988-06-07 1997-12-09 Hypertherm, Inc. Plasma arc cutting process and apparatus using an oxygen-rich gas shield
JP2523000B2 (ja) * 1988-10-20 1996-08-07 株式会社小松製作所 プラズマ切断機の板材加工方法およびプラズマト―チ
US4912296A (en) * 1988-11-14 1990-03-27 Schlienger Max P Rotatable plasma torch
US6215089B1 (en) * 1998-06-02 2001-04-10 Inocon Technologie Gesellschaft M.B.H. Plasma welding torch
US6268583B1 (en) * 1999-05-21 2001-07-31 Komatsu Ltd. Plasma torch of high cooling performance and components therefor
DE60128302T2 (de) * 2000-08-29 2008-01-24 Heraeus Quarzglas Gmbh & Co. Kg Plasmafeste Quartzglas-Haltevorrichtung
USD451113S1 (en) * 2001-01-18 2001-11-27 Komatsu Ltd. Nozzle for a plasma arc torch

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8772667B2 (en) 2007-02-09 2014-07-08 Hypertherm, Inc. Plasma arch torch cutting component with optimized water cooling
US8829385B2 (en) 2007-02-09 2014-09-09 Hypertherm, Inc. Plasma arc torch cutting component with optimized water cooling
EP2393343A3 (de) * 2008-03-12 2013-05-29 Hypertherm, Inc Vorrichtung und Verfahren für eine flüssigkeitsgekühlte Abschirmung für verbesserte Durchstechleistung
US9789561B2 (en) 2008-03-12 2017-10-17 Hypertherm, Inc. Apparatus and method for a liquid cooled shield for improved piercing performance
CN110087381A (zh) * 2011-03-25 2019-08-02 伊利诺斯工具制品有限公司 具有改进的等离子喷嘴的等离子体喷枪系统

Also Published As

Publication number Publication date
US20050133484A1 (en) 2005-06-23
CA2487970A1 (fr) 2005-06-12
FR2863817A1 (fr) 2005-06-17

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