EP3524038A1 - Capuchon de protection de buse, torche à plasma pourvue de ce capuchon de protection de buse ainsi qu'utilisation de la torche à plasma - Google Patents

Capuchon de protection de buse, torche à plasma pourvue de ce capuchon de protection de buse ainsi qu'utilisation de la torche à plasma

Info

Publication number
EP3524038A1
EP3524038A1 EP17783449.6A EP17783449A EP3524038A1 EP 3524038 A1 EP3524038 A1 EP 3524038A1 EP 17783449 A EP17783449 A EP 17783449A EP 3524038 A1 EP3524038 A1 EP 3524038A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
protection cap
nozzle protection
arc plasma
plasma torch
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
EP17783449.6A
Other languages
German (de)
English (en)
Other versions
EP3524038B1 (fr
Inventor
Jens Friedel
Timo Grundke
Volker Krink
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.)
Kjellberg Stiftung
Original Assignee
Kjellberg Stiftung
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 Kjellberg Stiftung filed Critical Kjellberg Stiftung
Publication of EP3524038A1 publication Critical patent/EP3524038A1/fr
Application granted granted Critical
Publication of EP3524038B1 publication Critical patent/EP3524038B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H05H1/28—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
    • H05H1/3457—Nozzle protection devices

Definitions

  • Nozzle cap Nozzle cap, arc plasma torch with this nozzle cap and use of the arc plasma torch
  • the present invention relates to a nozzle protection cap for a
  • Arc plasma torch an arc plasma torch with this nozzle cap and a use of the arc plasma torch.
  • the arc plasma torch can be used both for dry cutting and in particular but also advantageously for underwater cutting various metal workpieces.
  • an arc In plasma cutting, an arc (pilot arc) is first ignited between a cathode (electrode) and anode (nozzle) and then transferred directly to a workpiece to make a cut.
  • Said arc forms a plasma, which is a thermally highly heated, electrically conductive gas (plasma gas), which consists of positive and negative
  • Ions, electrons and excited and neutral atoms and molecules are used as plasma gas.
  • gases such as argon, hydrogen, nitrogen, oxygen or air are used. These gases are ionized and dissociated by the energy of the arc. The resulting plasma jet is used to cut the workpiece.
  • a modern arc plasma burner consists essentially of some basic elements, such as torch body, electrode (cathode), nozzle, one or more caps, in particular a nozzle cap and a
  • Nozzle protection cap surrounding the nozzle and connections used to supply the arc plasma torch with electrical power, gases and / or liquids.
  • Nozzle covers are used to protect a nozzle from heat and spewing molten metal from the workpiece during the cutting process.
  • a nozzle may consist of one or more component components. For direct water-cooled arc plasma torches, the nozzle becomes
  • the nozzle cap can be omitted. Then the secondary gas flows between the nozzle and the nozzle protection cap.
  • the electrode and the nozzle are arranged in a certain spatial relationship to each other and define a space, the plasma chamber, in which the plasma jet is formed.
  • the plasma jet can be in his
  • Parameters e.g. Diameter, temperature, energy density and
  • Flow rate of the plasma gas are greatly influenced by the design of the nozzle and electrode.
  • the electrodes and nozzles are made of different materials and in different shapes.
  • Nozzles and nozzle covers are usually made of copper and water cooled directly or indirectly. Depending on the cutting task and electrical power of the arc plasma torch nozzles are used, which have different inner contours and openings with different diameters and thus the optimal
  • DE 10 2004 049 445 A1 describes a
  • Nozzle cap holder as well as an arc plasma torch.
  • the nozzle guard comprises a front end portion and a rear end portion with a threaded portion on its inner surface to
  • EP 0 573 653 B1 relates to an arc plasma burner
  • Nozzle protection cap Just as in the arc plasma burner according to DE 10 2004 049 445 AI, a secondary gas within a
  • Nozzle protection cap holder inside a fferfactant tank and a nozzle cap asiderise a plasma jet The structural variants known per se from the prior art can in principle also be used in a nozzle protection cap according to the invention and an arc plasma torch equipped therewith.
  • the nozzle protection cap made of copper or other non-ferrous metal, which is usually particularly good heat conducting.
  • plasma cutting under water i. the tip of the plasma torch and thus the nozzle cap is located during the cutting in the water, in which the workpiece is arranged, occurs during piercing or cutting a reinforced
  • Another problem is the required mechanical strength of the nozzle caps, especially when the tip of the plasma torch and thus also the nozzle cap comes into contact with the workpiece. This can lead to deformations of the nozzle cap and also has a deterioration of the quality of the cut due to the disturbance of the gas flow of the secondary gas result.
  • the quality of cut over a longer period of time should be kept constant high and it should reduce the risk of mechanical damage to the nozzle cap.
  • the nozzle cap should be good heat conductive to avoid overheating.
  • Claim 8 defines a Arc plasma torch with this nozzle and claim 9, a use of the arc plasma torch.
  • the nozzle cap according to the invention for an arc plasma torch is on the outside at the top of the arc plasma torch, at which a plasma jet through nozzle-shaped openings of the
  • Arc plasma torch exits, arranged and fixed there. It is made of an iron alloy containing at least 0.05% sulfur.
  • sulfur should contain a proportion in the range of 0.05% to 0.5%, preferably in a proportion in the range of 0.1% to 0.4% and more preferably in the range of 0.15% to 0.35% be.
  • Alloy element which is selected from chromium, nickel, manganese, molybdenum, niobium, titanium, tungsten and vanadium, be included.
  • One or more additional alloying element (s) may be contained in a proportion of at most 35%.
  • the respective individual proportions of several additional alloying elements are summed up to a maximum of 35%.
  • the proportion of one or more additional alloying elements should be at least 5%, in addition to sulfur.
  • alloying element (s) and sulfur only iron should be part of the material used for the nozzle protection cap according to the invention.
  • no or a very small amount of carbon should be included in the iron alloy.
  • the carbon content should be limited to a maximum proportion of 2.1%, preferably a maximum proportion of 1.2%, more preferably a maximum proportion of 0.5%.
  • Cobalt should also be present in the iron alloy with less than 0.1%, preferably less than 0.05% and particularly preferably no cobalt.
  • the iron alloy used to make the nozzle guard should have a thermal conductivity of at least 10 W / m * K, a hardness of at least HB 150, and / or be resistant to oxidation and corrosion under normal environmental or service conditions. It should be under normal a common ambient atmosphere and use in water, in which at least no chemically aggressive substances are included, or an additional energy input, understood.
  • Nozzle cap is fastened, should at least be designed so that it has a burner body, an arranged in the torch body electrode, a
  • a nozzle having a central nozzle opening and arranged to cover the electrode separated by a plasma gas channel formed therebetween.
  • the nozzle protection cap which has a arranged at its front end side, the nozzle opening opposite the outlet opening and an annular secondary gas channel within the
  • Nozzle cap which communicates with the outlet opening should be releasably attached to the arc plasma torch.
  • the nozzle cap should be electrically insulated with respect to the electrode and the nozzle and form a secondary gas guide member having at least one passage.
  • Arc plasma torch can be used for cutting workpieces.
  • at least the nozzle protection cap and the respective workpiece are arranged below a water surface.
  • Showing: 1 shows a sectional view through an arc plasma burner with a nozzle protection cap according to the invention.
  • Fig. 1 shows a plasma torch 1 according to a particular embodiment of the invention.
  • the plasma torch 1 has a burner body 2 with a
  • Electrode 3 and a nozzle 4 which are formed substantially rotationally symmetrical about the longitudinal axis L of the plasma torch 1.
  • the electrode 3 and the nozzle 4 are arranged coaxially in the burner body 2, are in a certain spatial relationship and form a plasma chamber 6, through which flows a plasma gas PG, which is supplied via a plasma gas channel 6a.
  • a nozzle cap 5 is coaxial with the longitudinal axis L of the
  • Plasma torch 1 holds and surrounds the nozzle 4 protective.
  • the cooling water is supplied via a water feed WV and flows through a water return WR.
  • An annular secondary gas guide member 8 having a plurality of
  • Passages in particular in the form of bores, of which only one is denoted by the reference numeral 8a, is so in a formed between the nozzle cap 5 and a nozzle cap 7 secondary gas channel 9 between a secondary gas inlet 8b and the front end of the
  • Secondary gas channel 9 arranged so that the flowing through the passages 8a secondary gas SG strikes the outer surface of the nozzle cap 5.
  • the secondary gas SG is then passed through the secondary gas channel 9, which is delimited by the lateral surface of the nozzle cap 5 and the inner surface 7b of the nozzle cap 7, to the front end of the plasma torch 1, then a plasma jet (not shown) and passes through an outlet opening 7a of the nozzle cap 7 from.
  • Secondary gas SG flows around the plasma jet after its exit from a nozzle opening 4a and also creates a defined atmosphere around the
  • the passages 8a of the secondary gas guide part 8 are arranged so that a rotating flow of the secondary gas SG is achieved.
  • the passages 8 a in the secondary gas guide part 8 a can be equidistant over the
  • the burner has no nozzle cap 5 and the nozzle 4 is screwed, for example, in the burner body 2. Then, the space 5 through which the secondary gas SG flows, through the lateral surface of the nozzle 4 and through the inner surface 7 b of
  • Nozzle cap 7 limited.
  • Nozzle protection cap 7 according to claims 1 to 8 are used.
  • the nozzle guard 7 may be made of an alloy formed with iron and additionally 17% to 19% chromium, 8% to 10% nickel, and 0.15% to 0.35% sulfur.
  • the maximum carbon content can be 0.1%.

Landscapes

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

Abstract

L'invention concerne un capuchon de protection de buse (7) pour une torche à plasma (1), lequel est agencé extérieurement sur la pointe de la torche plasma (1), par laquelle un jet de plasma sort de la torche plasma (1) par des ouvertures (4a, 7a) en forme de buse, et y est fixé. Le capuchon de protection de buse (7) est fabriqué à partir d'un alliage de fer contenant du soufre à raison d'au moins 0,05 %.
EP17783449.6A 2016-10-06 2017-10-06 Capot de protection de buse, torche à plasma équipée de l'un ainsi qu'utilisation de la torche à plasma Active EP3524038B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016219350.3A DE102016219350A1 (de) 2016-10-06 2016-10-06 Düsenschutzkappe, Lichtbogenplasmabrenner mit dieser Düsenschutzkappe sowie eine Verwendung des Lichtbogenplasmabrenners
PCT/EP2017/075482 WO2018065578A1 (fr) 2016-10-06 2017-10-06 Capuchon de protection de buse, torche à plasma pourvue de ce capuchon de protection de buse ainsi qu'utilisation de la torche à plasma

Publications (2)

Publication Number Publication Date
EP3524038A1 true EP3524038A1 (fr) 2019-08-14
EP3524038B1 EP3524038B1 (fr) 2023-06-07

Family

ID=60080786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17783449.6A Active EP3524038B1 (fr) 2016-10-06 2017-10-06 Capot de protection de buse, torche à plasma équipée de l'un ainsi qu'utilisation de la torche à plasma

Country Status (7)

Country Link
US (1) US11178746B2 (fr)
EP (1) EP3524038B1 (fr)
JP (1) JP7090074B2 (fr)
CN (1) CN110036697A (fr)
DE (1) DE102016219350A1 (fr)
RU (1) RU2741583C2 (fr)
WO (1) WO2018065578A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016219350A1 (de) * 2016-10-06 2018-04-12 Kjellberg-Stiftung Düsenschutzkappe, Lichtbogenplasmabrenner mit dieser Düsenschutzkappe sowie eine Verwendung des Lichtbogenplasmabrenners
DE102019210524A1 (de) * 2019-07-17 2021-01-21 Volkswagen Aktiengesellschaft Elektrodenanordnung für einen Plasmabrenner
TWI759689B (zh) * 2020-02-18 2022-04-01 國立臺灣海洋大學 電化學噴嘴

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JPS61174349A (ja) 1985-01-30 1986-08-06 Res Inst Electric Magnetic Alloys 耐摩耗性高透磁率合金およびその製造法ならびに磁気記録再生ヘツド
DE69224183T2 (de) 1991-02-28 1998-06-18 Komatsu Mfg Co Ltd Plasmaschneidebrenner
US5334235A (en) * 1993-01-22 1994-08-02 The Perkin-Elmer Corporation Thermal spray method for coating cylinder bores for internal combustion engines
FR2706489B1 (fr) * 1993-06-14 1995-09-01 Ugine Savoie Sa Acier inoxydable martensitique à usinabilité améliorée.
CN1179124A (zh) * 1995-02-13 1998-04-15 株式会社小松制作所 等离子切割方法
US6096992A (en) * 1999-01-29 2000-08-01 The Esab Group, Inc. Low current water injection nozzle and associated method
DE102004049445C5 (de) 2004-10-08 2016-04-07 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Plasmabrenner
JP2007128677A (ja) 2005-11-01 2007-05-24 Komatsu Engineering Corp プラズマトーチ
EP1887096A1 (fr) 2006-08-09 2008-02-13 Rovalma, S.A. Acier pour travail à chaud
CN100503871C (zh) * 2007-08-15 2009-06-24 金雹峰 一种铁合金
DE202009018173U1 (de) 2009-08-11 2011-03-17 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Düsenschutzkappe und Düsenschutzkappenhalter sowie Lichtbogenplasmabrenner mit derselben und/oder demselben
CN201543958U (zh) * 2009-11-27 2010-08-11 徐常在 等离子弧割炬
RU2564534C2 (ru) * 2011-02-25 2015-10-10 Ниппон Стил Энд Сумитомо Метал Корпорейшн Плазменная горелка
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DE102016219350A1 (de) * 2016-10-06 2018-04-12 Kjellberg-Stiftung Düsenschutzkappe, Lichtbogenplasmabrenner mit dieser Düsenschutzkappe sowie eine Verwendung des Lichtbogenplasmabrenners

Also Published As

Publication number Publication date
JP7090074B2 (ja) 2022-06-23
US11178746B2 (en) 2021-11-16
RU2019110297A (ru) 2020-11-06
JP2019535109A (ja) 2019-12-05
US20200045804A1 (en) 2020-02-06
RU2019110297A3 (fr) 2020-11-25
DE102016219350A1 (de) 2018-04-12
WO2018065578A1 (fr) 2018-04-12
RU2741583C2 (ru) 2021-01-27
EP3524038B1 (fr) 2023-06-07
CN110036697A (zh) 2019-07-19

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