EP0923276B1 - Electrode body/electrode holder assembly for plasma torch - Google Patents

Electrode body/electrode holder assembly for plasma torch Download PDF

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Publication number
EP0923276B1
EP0923276B1 EP98403072A EP98403072A EP0923276B1 EP 0923276 B1 EP0923276 B1 EP 0923276B1 EP 98403072 A EP98403072 A EP 98403072A EP 98403072 A EP98403072 A EP 98403072A EP 0923276 B1 EP0923276 B1 EP 0923276B1
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EP
European Patent Office
Prior art keywords
electrode
electrode body
plasma torch
holder
electrode holder
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
EP98403072A
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German (de)
French (fr)
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EP0923276A1 (en
Inventor
Gérard Marhic
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.)
Lincoln Electric Co France SA
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La Soudure Autogene Francaise
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Publication of EP0923276A1 publication Critical patent/EP0923276A1/en
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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
    • 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
    • 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
    • H05H1/38—Guiding or centering of electrodes
    • 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 present invention relates to a set electrode body / electrode holder for plasma torch, a plasma torch provided with such an assembly and at a plasma arc welding, cutting or marking process likely to implement such a torch.
  • plasma torches consist of a torch body with, in its rear part, connections to supply pipes in fluid, especially in plasma gas, and in current electric and, in its front part, means of mounting the electrode body and the nozzle.
  • the torch can be provided with means assembly / disassembly, as described in EP-A-599709.
  • This document teaches a plasma torch having a torch support with a first support face and fluid circuits; a unitary torch body assembly with an electrode, a nozzle, fluid circuits and a second support face; and assembly means for quickly assemble the unitary torch body assembly to the torch holder so that the first side support comes into axial support against the second support face and that the fluid circuits of the torch holder come to communicate with the fluid circuits of the unitary torch body assembly.
  • the actual electrode is generally carried by a support element, also called electrode body, which furthermore performs a function of radiator by allowing the evacuation of part of the heat given off during welding, cutting or plasma marking, by heat exchange with a cooling.
  • the electrode body has a shape of threaded sleeve of circular section. Tapping practiced on part of the peripheral surface inside of the sleeve ensures fixing by screwing the electrode body onto the electrode holder, which carries an additional thread on its outer circumference.
  • the aim of the present invention is therefore to alleviate the aforementioned problems by proposing a set male / female for plasma torch whose structure allows, in particular, to improve the centering of the electrode body on the electrode holder without require an increase in the length of the threads fixation.
  • the invention also relates to a torch with plasma as given in claims 9 to 11 and on an automatic welding, cutting or plasma arc marking equipped with a plasma torch.
  • the invention further relates to a method of cutting, welding or plasma arc marking likely to use a plasma torch according to the invention.
  • FIG. 1 shows a diagram of a section longitudinal of part of the distal end of a male / female assembly fitted to a plasma torch according to prior art.
  • This male / female set 1 consists an electrode holder 4 whose distal end 4 'carries a 5 'thread on part of its peripheral wall external, of an electrode body 3 carrying a thread 5 fitted on part of its internal peripheral wall from its proximal end 3 'and supporting, in addition, the actual electrode 2.
  • the electrode body 3 has substantially the shape of a sleeve and is fixed only by screwing on the electrode holder 4 via thread 5 'and tapping 5 carried, respectively, by said distal 4 'and proximal 3' ends.
  • the threaded portions 5 'and threaded 5 not only provide centering and positioning of the electrode body 3 on the electrode holder 4, but also their maintenance in contact with one with the other.
  • the dip tube 6 ensures the routing a coolant which sweeps the internal walls of electrode body 3 and electrode holder 4, so as to ensure cooling of these by heat exchange.
  • the body electrode 3 is made of a metal or an alloy metallic, for example a copper alloy.
  • the electrode 2 is an electrode for cutting, plasma arc welding or marking which may or may not, depending on the case, include a recess or protrusion of its downstream end, which can be made in one material chosen in particular from hafnium, zirconium and tungsten.
  • the male / female assembly 1 represented in FIG. 1 has several drawbacks, in particular of achieving imperfect or incorrect centering of the electrode body 3 on the electrode holder 4, since said centering is only ensured by the threaded parts 5 and 5 '.
  • Figures 2 to 8 show, for their part, electrode holder 3 or electrode body 4 diagrams according to the present invention taken in isolation or in association in a male / female set.
  • FIG. 3 represents a view in longitudinal section of an identical male / female assembly to that of FIG. 2, but angularly offset by one angle of about 45 °, as shown in Figure 3a.
  • a male / female assembly 11 comprising an electrode 2 carried by an electrode body 3, said electrode electrode body 3 being fixed by means of its 3 'proximal end, by screwing on the electrode holder 4 by means of the 15 'threaded and tapped parts 15.
  • the internal thread 15 is arranged on the proximal part of the internal wall of the electrode body 3 (see figures 4 and 5) and the thread 15 'is carried by part of the outer peripheral wall of electrode holder 4 (see figure 6).
  • the inside of the electrode body 3 has been machined so as to present, in cross section, a hexagonal shape (H), near its end proximal 3 ', as shown schematically in Figure 5.
  • a 4 "template has been installed on the distal end 4 'of the electrode holder 4 (see figure 6) to be able to adapt to the new configuration internal of the electrode body 3. More precisely, as it can be seen in Figures 2, 3 and 4, the distal end 4 ′ of the electrode holder 4 has been extended towards electrode 2 and template 4 " located on its present outer wall, in section transverse, at least locally complementary to that of the inner wall of the body electrode 3, that is, here, a shape also hexagonal, as shown diagrammatically in FIG. 6A.
  • recesses 8 and / or the 4 "gauge is not necessarily a symmetrical shape, such as in particular polygonal shapes convex or concave or multi-lobed forms.
  • the recesses 8 and the template 4 can take on more or less complex forms, partially or completely complementary to each other, in the measure that the relative sliding by nesting of the electrode holder and electrode body is assured.
  • a 15 'thread was fitted on the wall external device of said electrode holder 4, so able to cooperate, by screwing, with thread 15 carried by the electrode body 3.
  • FIGS. 7 and 8 The placement of the electrode body 3 on the electrode holder 4 is detailed in FIGS. 7 and 8.
  • This implementation consists of a phase of mounting ( Figure 7) and a tightening phase (Figure 8).
  • the assembly phase ( Figure 7) we introduce the electrode holder (4) inside the sleeve that constitutes the electrode body 3, according to a movement of translation until the start of the 15 'thread, said 15 'thread serving as a stop.
  • the phase tightening ( Figure 8), we operate a proper screwing 15 'threaded and tapped / hollowed out parts 15 one with the other.
  • the centering of the electrode body 3 on the electrode holder 4 is obtained by guidance / positioning of the 4 "template carried by the electrode holder 4 by the internal peripheral wall of the housing 16, that is to say of the part of the electrode holder 3 having a diameter D2, as shown in Figure 4.
  • the diameter D1 of the part threaded / machined 15 is less than the diameter D2 of the housing 16 located between said threaded portion 15 and the bottom of the electrode body 3 (see Figure 4).
  • orifices 9, here 4 in number have been made within the end 4 'of the electrode holder 4, which 9 holes allow the flow of cooling channeled through channel 6 'of the tube plunger 6.
  • This cooling flow can thus go in contact with the internal wall of the electrode body 3 in order to ensure efficient cooling thereof and better than the cooling obtained conventionally.
  • FIG. 4 is a diagram, in longitudinal section, an electrode body 3 similar to that of FIGS. 2 and 3, shown not attached to an electrode holder.
  • the electrode body 3 has a sleeve shape carrying at its distal end the electrode 2 and at its proximal end 3 ', on its internal peripheral wall, a thread 15 in length d, within which recesses 8 are made, so as to present a hexagonal cross section H.
  • Figure 6 is a diagram of an electrode holder 4 according to the invention bearing on its 4 ′ end, a 15 'thread intended to come to cooperate by screwing with the tapping 15 of the electrode body 3 of FIG. 4 and, in in addition, a 4 "template with a complementary profile recesses 8 made within the internal thread 15 of the body electrode 3.
  • the dimension D3 of the template 4 "of the electrode holder 4 is less, by the value of a functional clearance, than diameter D2 of the housing 16 of the electrode body 3 for allow the relative movement of a part with respect to the other, but close enough or close enough to ensure the desired centering effect, and therefore allow correct positioning of the electrode body 3 on said electrode holder 4.
  • the male / female assembly 11 according to the invention can equip manual or automatic plasma torches.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Geometry (AREA)
  • Arc Welding In General (AREA)
  • Plasma Technology (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)

Description

La présente invention se rapporte à un ensemble corps d'électrode/porte-électrode pour torche à plasma, à une torche à plasma munie d'un tel ensemble et à un procédé de soudage, coupage ou marquage à l'arc plasma susceptible de mettre en oeuvre une telle torche.The present invention relates to a set electrode body / electrode holder for plasma torch, a plasma torch provided with such an assembly and at a plasma arc welding, cutting or marking process likely to implement such a torch.

Habituellement, les torches plasma se composent d'un corps de torche avec, dans sa partie arrière, des raccordements à des canalisations d'alimentation en fluide, notamment en gaz plasmagène, et en courant électrique et, dans sa partie avant, des moyens de montage du corps d'électrode et de la tuyère.Usually plasma torches consist of a torch body with, in its rear part, connections to supply pipes in fluid, especially in plasma gas, and in current electric and, in its front part, means of mounting the electrode body and the nozzle.

Dans certains cas, afin notamment de faciliter l'entretien et/ou le remplacement des pièces usagées ou défectueuses, la torche peut être dotée de moyens d'assemblage/désassemblage rapide, ainsi que décrit dans le document EP-A-599709.In some cases, in particular to facilitate maintenance and / or replacement of used parts or defective, the torch can be provided with means assembly / disassembly, as described in EP-A-599709.

Ce document enseigne une torche à plasma comportant un support de torche avec une première face d'appui et des circuits de fluide ; un ensemble unitaire de corps de torche avec une électrode, une tuyère, des circuits de fluide et une deuxième face d'appui ; et des moyens d'assemblage pour assembler rapidement l'ensemble unitaire de corps de torche au support de torche de manière à ce que la première face d'appui vienne en appui axial contre la deuxième face d'appui et à ce que les circuits de fluide du support de torche viennent communiquer avec les circuits de fluide de l'ensemble unitaire de corps de torche.This document teaches a plasma torch having a torch support with a first support face and fluid circuits; a unitary torch body assembly with an electrode, a nozzle, fluid circuits and a second support face; and assembly means for quickly assemble the unitary torch body assembly to the torch holder so that the first side support comes into axial support against the second support face and that the fluid circuits of the torch holder come to communicate with the fluid circuits of the unitary torch body assembly.

Ainsi que détaillé ci-après, dans les torches à plasma classiques, l'électrode proprement-dite est généralement portée par un élément-support, encore appelé corps d'électrode, lequel assure, en outre, une fonction de radiateur en permettant l'évacuation d'une partie de la chaleur dégagée, lors du soudage, du coupage ou du marquage plasma, par échange thermique avec un fluide de refroidissement. As detailed below, in the torches at conventional plasma, the actual electrode is generally carried by a support element, also called electrode body, which furthermore performs a function of radiator by allowing the evacuation of part of the heat given off during welding, cutting or plasma marking, by heat exchange with a cooling.

Habituellement, le corps d'électrode a une forme de manchon taraudé de section circulaire. Le taraudage pratiqué sur une partie de la surface périphérique intérieure du manchon permet d'assurer une fixation par vissage du corps d'électrode sur le porte-électrode, lequel porte un filetage complémentaire sur sa circonférence externe.Usually the electrode body has a shape of threaded sleeve of circular section. Tapping practiced on part of the peripheral surface inside of the sleeve ensures fixing by screwing the electrode body onto the electrode holder, which carries an additional thread on its outer circumference.

Or, il a été observé qu'avec ce type de montage reposant uniquement sur une fixation par vissage, le centrage du corps d'électrode n'est pas toujours correctement assuré.However, it has been observed that with this type of mounting based solely on a screw fixing, the centering of the electrode body is not always properly insured.

Il en résulte alors une détérioration accélérée notamment de l'électrode proprement-dite et en particulier de la tuyère, engendrant ainsi un remplacement plus fréquent de l'ensemble constitué par l'électrode et la tuyère de la torche et, par là même, une augmentation des coûts.This results in accelerated deterioration in particular of the electrode proper and in particular of the nozzle, thus generating a more frequent replacement of the assembly consisting of the electrode and the nozzle of the torch and, thereby, increased costs.

En outre, si augmenter la longueur des filetages permet de pallier en partie ce problème de mauvais centrage de l'électrode, cette solution ne peut être considérée comme totalement satisfaisante car elle entraíne une diminution de la surface interne permettant l'échange thermique entre le fluide de refroidissement et le corps d'électrode et donc une baisse importante de l'efficacité du refroidissement de celui-ci. En d'autres termes, l'augmentation de la longueur des filetages de fixation se fait au détriment des échanges thermiques, ce qui n'est pas acceptable.In addition, if increase the length of the threads helps to partially overcome this problem of bad centering of the electrode, this solution cannot be considered completely satisfactory because it causes a decrease in the internal surface allowing the heat exchange between the coolant and the electrode body and therefore a significant drop in the cooling efficiency thereof. In others terms, increasing the length of the threads of fixing is done at the expense of heat exchange, this which is not acceptable.

Le but de la présente invention est donc de pallier les problèmes précités en proposant un ensemble mâle/femelle pour torche à plasma dont la structure permette, en particulier, d'améliorer le centrage du corps d'électrode sur le porte-électrode et ce, sans requérir d'augmentation de la longueur des filetages de fixation. The aim of the present invention is therefore to alleviate the aforementioned problems by proposing a set male / female for plasma torch whose structure allows, in particular, to improve the centering of the electrode body on the electrode holder without require an increase in the length of the threads fixation.

La présente invention concerne alors un corps d'électrode pour torche à plasma ayant sensiblement une forme de manchon et comportant :

  • sur une partie amont de sa périphérie interne, au moins un taraudage au sein duquel est pratiqué au moins un évidement se poursuivant sur toute la longueur dudit taraudage, la partie taraudée présentant, en coupe transversale un diamètre D1, et
  • au moins une partie aval définissant un logement de diamètre D2 situé entre la partie amont taraudée et le fond du corps d'électrode, avec D2 > D1.
The present invention therefore relates to an electrode body for a plasma torch having substantially the shape of a sleeve and comprising:
  • on an upstream part of its internal periphery, at least one tapping within which is made at least one recess continuing over the entire length of said tapping, the tapped part having, in cross section a diameter D1, and
  • at least one downstream part defining a housing of diameter D2 situated between the tapped upstream part and the bottom of the electrode body, with D2> D1.

Selon le cas, le corps d'électrode selon l'invention peut comprendre l'une ou plusieurs des caractéristiques suivantes:

  • le corps d'électrode comporte plusieurs évidements;
  • les évidements dudit corps d'électrode forment, en coupe transversale, un polygone;
  • les évidements forment un polygone choisi parmi le triangle, le carré, le pentagone, l'hexagone, l'heptagone et l'octogone;
  • le fond du corps d'électrode, c'est-à-dire son extrémité active, comprend une électrode.
Depending on the case, the electrode body according to the invention can comprise one or more of the following characteristics:
  • the electrode body has several recesses;
  • the recesses of said electrode body form, in cross section, a polygon;
  • the recesses form a polygon chosen from the triangle, the square, the pentagon, the hexagon, the heptagon and the octagon;
  • the bottom of the electrode body, that is to say its active end, comprises an electrode.

L'invention concerne également un ensemble mâle/femelle pour torche à plasma comprenant un corps d'électrode ayant sensiblement une forme de manchon formant la partie femelle et un porte-électrode de forme sensiblement allongée formant la partie mâle, dans lequel:

  • le corps d'électrode est tel que défini ci-dessus, et
  • le porte-électrode comprend, sur sa surface périphérique externe, au moins un gabarit présentant au moins localement un profil en coupe transversale correspondant au profil dudit au moins un évidement du corps d'électrode et au moins un filetage, ledit gabarit étant situé entre l'extrémité aval du porte-électrode et ledit filetage.
The invention also relates to a male / female assembly for a plasma torch comprising an electrode body having substantially the shape of a sleeve forming the female part and an electrode holder of substantially elongated shape forming the male part, in which:
  • the electrode body is as defined above, and
  • the electrode holder comprises, on its external peripheral surface, at least one template having at least locally a cross-sectional profile corresponding to the profile of said at least one recess of the electrode body and at least one thread, said template being located between the downstream end of the electrode holder and said thread.

En outre, l'invention porte aussi sur une torche à plasma telle que donnée dans les revendications 9 à 11 et sur une machine automatique de soudage, coupage ou marquage à l'arc plasma équipée d'une torche à plasma. Furthermore, the invention also relates to a torch with plasma as given in claims 9 to 11 and on an automatic welding, cutting or plasma arc marking equipped with a plasma torch.

L'invention concerne, en outre, un procédé de coupage, de soudage ou de marquage à l'arc plasma susceptible de mettre en oeuvre une torche à plasma selon l'invention.The invention further relates to a method of cutting, welding or plasma arc marking likely to use a plasma torch according to the invention.

La présente invention va maintenant être décrite plus en détail en référence aux figures annexées, données à titre illustratif, mais non limitatif.The present invention will now be described. in more detail with reference to the appended figures, given by way of illustration, but not limitation.

La figure 1 représente un schéma d'une coupe longitudinale d'une partie de l'extrémité distale d'un ensemble mâle/femelle équipant une torche à plasma selon l'art antérieur. Cet ensemble mâle/femelle 1 se compose d'un porte-électrode 4 dont l'extrémité distale 4' porte un filetage 5' sur une partie de sa paroi périphérique externe, d'un corps d'électrode 3 portant un taraudage 5 aménagé sur une partie de sa paroi périphérique interne de son extrémité proximale 3' et supportant, en outre, l'électrode proprement-dite 2.Figure 1 shows a diagram of a section longitudinal of part of the distal end of a male / female assembly fitted to a plasma torch according to prior art. This male / female set 1 consists an electrode holder 4 whose distal end 4 'carries a 5 'thread on part of its peripheral wall external, of an electrode body 3 carrying a thread 5 fitted on part of its internal peripheral wall from its proximal end 3 'and supporting, in addition, the actual electrode 2.

Le corps d'électrode 3 a sensiblement la forme d'un manchon et vient se fixer uniquement par vissage sur le porte-électrode 4 par l'intermédiaire du filetage 5' et du taraudage 5 portés, respectivement, par lesdites extrémités distales 4' et proximale 3'.The electrode body 3 has substantially the shape of a sleeve and is fixed only by screwing on the electrode holder 4 via thread 5 'and tapping 5 carried, respectively, by said distal 4 'and proximal 3' ends.

En d'autres termes, les parties filetée 5' et taraudée 5 assurent non seulement le centrage et le positionnement du corps d'électrode 3 sur le porte-électrode 4, mais aussi leur maintien en contact l'un avec l'autre. In other words, the threaded portions 5 'and threaded 5 not only provide centering and positioning of the electrode body 3 on the electrode holder 4, but also their maintenance in contact with one with the other.

En outre, le tube plongeur 6 assure l'acheminement d'un fluide de refroidissement qui vient balayer les parois internes du corps d'électrode 3 et du porte-électrode 4, de manière à assurer un refroidissement de ceux-ci par échange thermique. Habituellement, le corps d'électrode 3 est réalisé en un métal ou en un alliage métallique, par exemple en un alliage de cuivre.In addition, the dip tube 6 ensures the routing a coolant which sweeps the internal walls of electrode body 3 and electrode holder 4, so as to ensure cooling of these by heat exchange. Usually the body electrode 3 is made of a metal or an alloy metallic, for example a copper alloy.

L'électrode 2 est une électrode pour coupage, soudage ou marquage à l'arc plasma pouvant ou non, selon le cas, comprendre un renfoncement ou une protubérance de son extrémité aval, laquelle peut être réalisée en un matériau choisi notamment parmi le hafnium, le zirconium et le tungstène.The electrode 2 is an electrode for cutting, plasma arc welding or marking which may or may not, depending on the case, include a recess or protrusion of its downstream end, which can be made in one material chosen in particular from hafnium, zirconium and tungsten.

L'ensemble mâle/femelle 1 représenté sur la figure 1 présente plusieurs inconvénients, notamment d'aboutir à un centrage imparfait ou incorrect du corps d'électrode 3 sur le porte-électrode 4, étant donné que ledit centrage n'est assuré que par les parties filetées 5 et 5'.The male / female assembly 1 represented in FIG. 1 has several drawbacks, in particular of achieving imperfect or incorrect centering of the electrode body 3 on the electrode holder 4, since said centering is only ensured by the threaded parts 5 and 5 '.

Or, d'un centrage incorrect du corps d'électrode 3 sur le porte-électrode 4, il peut résulter notamment des détériorations accélérées de l'électrode et/ou de la tuyère.However, incorrect centering of the electrode body 3 on the electrode holder 4, it may notably result from accelerated deterioration of the electrode and / or the nozzle.

Les figures 2 à 8 représentent, quant à elles, des schémas de porte-électrode 3 ou de corps d'électrode 4 selon la présente invention pris isolément ou en association en un ensemble mâle/femelle.Figures 2 to 8 show, for their part, electrode holder 3 or electrode body 4 diagrams according to the present invention taken in isolation or in association in a male / female set.

Il est à noter que la figure 3 représente une vue en coupe longitudinale d'un ensemble mâle/femelle identique à celui de la figure 2, mais angulairement décalée d'un angle d'environ 45°, ainsi que montré sur la figure 3a.It should be noted that FIG. 3 represents a view in longitudinal section of an identical male / female assembly to that of FIG. 2, but angularly offset by one angle of about 45 °, as shown in Figure 3a.

Plus précisément, on voit sur les figures 2 et 3, un ensemble mâle/femelle 11 selon l'invention, comprenant une électrode 2 portée par un corps d'électrode 3, ledit corps d'électrode 3 étant fixé par l'intermédiaire de son extrémité proximale 3', par vissage sur le porte-électrode 4 au moyen des parties filetée 15' et taraudée 15.More specifically, we see in Figures 2 and 3, a male / female assembly 11 according to the invention, comprising an electrode 2 carried by an electrode body 3, said electrode electrode body 3 being fixed by means of its 3 'proximal end, by screwing on the electrode holder 4 by means of the 15 'threaded and tapped parts 15.

Le taraudage 15 est aménagé sur la partie proximale de la paroi interne du corps d'électrode 3 (voir figures 4 et 5) et le filetage 15' est porté par une partie de la paroi périphérique externe du porte-électrode 4 (voir figure 6).The internal thread 15 is arranged on the proximal part of the internal wall of the electrode body 3 (see figures 4 and 5) and the thread 15 'is carried by part of the outer peripheral wall of electrode holder 4 (see figure 6).

Afin de pallier les problèmes susmentionnés et assurer un centrage correct et efficace du corps d'électrode 3, et donc de l'électrode 2, sur le porte-électrode 4, l'intérieur du corps d'électrode 3 a été usiné de manière à présenter, en coupe transversale, une forme hexagonale (H), au voisinage de son extrémité proximale 3', ainsi que schématisé sur la figure 5.In order to overcome the above problems and ensure correct and effective centering of the body of electrode 3, and therefore of electrode 2, on the electrode holder 4, the inside of the electrode body 3 has been machined so as to present, in cross section, a hexagonal shape (H), near its end proximal 3 ', as shown schematically in Figure 5.

Plus précisément, des évidements ont été pratiqués au sein du taraudage 15 porté par la paroi périphérique interne du corps d'électrode 3, de manière à présenter ladite forme hexagonale (H).More specifically, recesses were made within the internal thread 15 carried by the peripheral wall internal of the electrode body 3, so as to present said hexagonal shape (H).

Par ailleurs, un gabarit 4" a été aménagé sur l'extrémité distale 4' du porte-électrode 4 (voir figure 6) pour pouvoir s'adapter à la nouvelle configuration interne du corps d'électrode 3. Plus précisément, comme on peut le constater sur les figures 2, 3 et 4, l'extrémité distale 4' du porte-électrode 4 a été prolongée en direction de l'électrode 2 et le gabarit 4" situé sur sa paroi extérieure présente, en coupe transversale, une forme au moins localement complémentaire de celle de la paroi interne du corps d'électrode 3, c'est-à-dire, ici, une forme également hexagonale, ainsi que schématisé sur la figure 6A.In addition, a 4 "template has been installed on the distal end 4 'of the electrode holder 4 (see figure 6) to be able to adapt to the new configuration internal of the electrode body 3. More precisely, as it can be seen in Figures 2, 3 and 4, the distal end 4 ′ of the electrode holder 4 has been extended towards electrode 2 and template 4 " located on its present outer wall, in section transverse, at least locally complementary to that of the inner wall of the body electrode 3, that is, here, a shape also hexagonal, as shown diagrammatically in FIG. 6A.

Il convient néanmoins de préciser que la forme des évidements 8 et/ou du gabarit 4" n'est pas forcément une forme symétrique, telles notamment les formes polygonales convexes ou concaves ou les formes polylobées. En effet, les évidements 8 et le gabarit 4" peuvent revêtir des formes plus ou moins complexes, partiellement ou complètement complémentaires les unes des autres, dans la mesure où le coulissement relatif par emboítement du porte-électrode et du corps d'électrode est assuré.However, it should be noted that the form of recesses 8 and / or the 4 "gauge is not necessarily a symmetrical shape, such as in particular polygonal shapes convex or concave or multi-lobed forms. Indeed, the recesses 8 and the template 4 "can take on more or less complex forms, partially or completely complementary to each other, in the measure that the relative sliding by nesting of the electrode holder and electrode body is assured.

En outre, un filetage 15' a été aménagé sur la paroi périphérique externe dudit porte-électrode 4, de manière à pouvoir coopérer, par vissage, avec le filetage 15 porté par le corps d'électrode 3.In addition, a 15 'thread was fitted on the wall external device of said electrode holder 4, so able to cooperate, by screwing, with thread 15 carried by the electrode body 3.

De par la configuration du corps d'électrode 3 et du porte-électrode 4 selon l'invention, on assiste, lors de la mise en place du corps d'électrode 3 sur le porte-électrode 4, à un centrage quasi-parfait dudit corps d'électrode 3 sur ledit porte-électrode 4.Due to the configuration of the electrode body 3 and the electrode holder 4 according to the invention, we assist, during placing the electrode body 3 on the electrode holder 4, to a near-perfect centering of said body electrode 3 on said electrode holder 4.

La mise en place du corps d'électrode 3 sur le porte-électrode 4 est détaillée sur les figures 7 et 8.The placement of the electrode body 3 on the electrode holder 4 is detailed in FIGS. 7 and 8.

Cette mise en place se compose d'une phase de montage (figure 7) et d'une phase de serrage (figure 8). Durant, la phase de montage (figure 7), on introduit le porte-électrode (4) à l'intérieur du manchon que constitue le corps d'électrode 3, selon un mouvement de translation jusqu'au départ du filetage 15', ledit filetage 15' servant de butée. Ensuite, durant la phase de serrage (figure 8), on opère un vissage proprement-dit des parties filetée 15' et taraudée/évidée 15 l'une avec l'autre.This implementation consists of a phase of mounting (Figure 7) and a tightening phase (Figure 8). During the assembly phase (Figure 7), we introduce the electrode holder (4) inside the sleeve that constitutes the electrode body 3, according to a movement of translation until the start of the 15 'thread, said 15 'thread serving as a stop. Then during the phase tightening (Figure 8), we operate a proper screwing 15 'threaded and tapped / hollowed out parts 15 one with the other.

En fait, le centrage du corps d'électrode 3 sur le porte-électrode 4 est obtenu par un guidage/positionnement du gabarit 4" porté par le porte-électrode 4 par la paroi périphérique interne du logement 16, c'est-à-dire de la partie du support d'électrode 3 ayant un diamètre D2, ainsi que montré sur la figure 4.In fact, the centering of the electrode body 3 on the electrode holder 4 is obtained by guidance / positioning of the 4 "template carried by the electrode holder 4 by the internal peripheral wall of the housing 16, that is to say of the part of the electrode holder 3 having a diameter D2, as shown in Figure 4.

Dans tous les cas, le diamètre D1 de la partie taraudée/usinée 15 est inférieur au diamètre D2 du logement 16 situé entre ladite partie taraudée 15 et le fond du corps d'électrode 3 (voir figure 4).In all cases, the diameter D1 of the part threaded / machined 15 is less than the diameter D2 of the housing 16 located between said threaded portion 15 and the bottom of the electrode body 3 (see Figure 4).

En outre, il apparaít clairement sur les figures 2 et 3 que la longueur d du taraudage 15 et du filetage 15' portés par le corps d'électrode 3 et porte-électrode 4 de l'ensemble 11 mâle/femelle selon l'invention est nettement moindre que la longueur d' des filetages 5 et 5' desdites pièces d'un ensemble mâle/femelle selon l'art antérieur (figure 1). Or, le fait de pouvoir réduire la taille d du taraudage 15 et du filetage 15' est avantageux car une telle réduction de taille permet, à géométrie extérieure constante, d'améliorer le refroidissement notamment du corps d'électrode 3 et de l'électrode 2 en permettant un gain de surface d'échange thermique, lequel peut dépasser 40 % par rapport à la surface d'échange thermique d'une torche selon l'art antérieur (Figure 1).In addition, it appears clearly in Figures 2 and 3 that the length d of the internal thread 15 and the thread 15 ' carried by the electrode body 3 and electrode holder 4 of the set 11 male / female according to the invention is significantly less than the length of threads 5 and 5 'of said parts of a male / female assembly according to the art anterior (Figure 1). Being able to reduce the size d of thread 15 and thread 15 'is advantageous because such a reduction in size allows, constant exterior geometry, improve the cooling in particular of the electrode body 3 and electrode 2 by allowing an exchange surface gain thermal, which can exceed 40% compared to the heat exchange surface of a torch according to art anterior (Figure 1).

Ainsi que représenté notamment sur les figures 2 et 3A, des orifices 9, ici au nombre de 4, ont été pratiqués au sein de l'extrémité 4' du porte-électrode 4, lesquels orifices 9 permettent le passage du flux de refroidissement acheminé par le canal 6' du tube plongeur 6. Ce flux de refroidissement peut ainsi aller au contact de la paroi interne du corps d'électrode 3 afin d'y assurer un refroidissement efficace de celui-ci et meilleur que les refroidissements obtenus classiquement.As shown in particular in FIGS. 2 and 3A, orifices 9, here 4 in number, have been made within the end 4 'of the electrode holder 4, which 9 holes allow the flow of cooling channeled through channel 6 'of the tube plunger 6. This cooling flow can thus go in contact with the internal wall of the electrode body 3 in order to ensure efficient cooling thereof and better than the cooling obtained conventionally.

La figure 4 est un schéma, en coupe longitudinale, d'un corps d'électrode 3 analogue à celui des figures 2 et 3, représenté non fixé à un porte-électrode. Sur cette figure 4, on voit que le corps d'électrode 3 a une forme de manchon portant à son extrémité distale l'électrode 2 et à son extrémité proximale 3', sur sa paroi périphérique interne, un taraudage 15 de longueur d, au sein duquel sont pratiqués des évidements 8, de manière à présenter une section transversale hexagonale H.FIG. 4 is a diagram, in longitudinal section, an electrode body 3 similar to that of FIGS. 2 and 3, shown not attached to an electrode holder. Sure this figure 4, we see that the electrode body 3 has a sleeve shape carrying at its distal end the electrode 2 and at its proximal end 3 ', on its internal peripheral wall, a thread 15 in length d, within which recesses 8 are made, so as to present a hexagonal cross section H.

Ceci apparaít plus nettement sur la figure 5, qui représente une vue en coupe transversale de la partie 15 taraudée de la figure 4, et sur la quelle on voit que des évidements (8) on été pratiqués dans le taraudage 15, de manière à lui conférer une forme sensiblement hexagonale (H).This appears more clearly in Figure 5, which shows a cross-sectional view of part 15 tapped in Figure 4, and on which we see that recesses (8) have been made in the internal thread 15, so as to give it a shape that is substantially hexagonal (H).

La figure 6 est un schéma d'un porte-électrode 4 selon l'invention portant sur son extrémité 4', un filetage 15' destiné à venir coopérer par vissage avec le taraudage 15 du corps d'électrode 3 de la Fig. 4 et, en outre, un gabarit 4" ayant un profil complémentaire des évidements 8 pratiqués au sein du taraudage 15 du corps d'électrode 3.Figure 6 is a diagram of an electrode holder 4 according to the invention bearing on its 4 ′ end, a 15 'thread intended to come to cooperate by screwing with the tapping 15 of the electrode body 3 of FIG. 4 and, in in addition, a 4 "template with a complementary profile recesses 8 made within the internal thread 15 of the body electrode 3.

La dimension D3 du gabarit 4" du porte-électrode 4 est inférieure, de la valeur d'un jeu fonctionnel, au diamètre D2 du logement 16 du corps d'électrode 3 pour permettre le mouvement relatif d'une pièce par rapport à l'autre, mais suffisamment proche ou voisine pour assurer l'effet de centrage recherché, et donc permettre un positionnement correct du corps d'électrode 3 sur ledit porte-électrode 4.The dimension D3 of the template 4 "of the electrode holder 4 is less, by the value of a functional clearance, than diameter D2 of the housing 16 of the electrode body 3 for allow the relative movement of a part with respect to the other, but close enough or close enough to ensure the desired centering effect, and therefore allow correct positioning of the electrode body 3 on said electrode holder 4.

En outre, on veille à ce que la distance M séparant le gabarit 4" du début du filetage 15' du porte-électrode 4 soit supérieure à la longueur d du taraudage du corps d'électrode 3.In addition, it is ensured that the distance M separating the template 4 "from the start of the 15 'thread of the electrode holder 4 is greater than the length d of the internal thread electrode 3.

L'ensemble mâle/femelle 11 selon l'invention peut équiper des torches à plasma manuelles ou automatiques.The male / female assembly 11 according to the invention can equip manual or automatic plasma torches.

Claims (13)

  1. Electrode body (3) for a plasma torch having substantially the shape of a sleeve and comprising:
    over an upstream portion of its internal periphery, at least one tapping (15) within which at least one recess (8) is made, said recess extending over the entire length (d) of the said tapping (15), the tapped portion (15) having, in cross section, a diameter D1; and
    at least one downstream portion defining a housing (16) of diameter D2 located between the tapped upstream portion (15) and the bottom of the electrode body (3), where D2 > D1.
  2. Electrode body according to Claim 1, characterized in that the bottom of the electrode body (3) includes an electrode (2).
  3. Electrode body according to either of Claims 1 and 2, characterized in that it includes several recesses (8).
  4. Electrode body according to one of Claims 1 to 3, characterized in that it includes several recesses (8) forming, in cross section, a polygon.
  5. Electrode body according to one of Claims 1 to 4, characterized in that the recesses (8) form a polygon chosen from triangles, squares, pentagons, hexagons, heptagons and octagons.
  6. Electrode body according to one of Claims 1 to 5, characterized in that it is made of a metal or a metal alloy, preferably a copper alloy.
  7. Electrode body according to one of Claims 1 to 6, characterized in that it includes an electrode (2) made of a material chosen from hafnium, zirconium and tungsten.
  8. Male/female assembly (11) for a plasma torch comprising an electrode body (3) having substantially the shape of a sleeve forming the female portion and an electrode holder (4) of substantially elongate shape forming the male portion, in which:
    the electrode body (3) is according to one of Claims 1 to 7; and
    the electrode holder (4) comprises, over its external peripheral surface, at least one gauge (4") having, at least locally, a cross-sectional profile corresponding to the profile of the said at least one recess (8) of the electrode body (3) and at least one screw thread (15'), the said gauge (4") being located between the downstream end of the electrode holder (4) and the said screw thread (15').
  9. Plasma torch provided with an electrode holder (4) comprising, on its external peripheral surface, at least one gauge (4") and at least one screw thread (15'), the said gauge (4") being located between the downstream end of the electrode holder (4) and the said screw thread (15'), the said gauge (4") having, at least locally, a cross-sectional profile corresponding to the profile of the said at least one recess (8) of an electrode body (3) according to one of Claims 1 to 7.
  10. Plasma torch, characterized in that it is fitted with a male/female assembly (11) according to Claim 8.
  11. Automatic plasma-arc welding, cutting or marking machine, characterized in that it is fitted with a plasma torch according to either of Claims 9 and 10.
  12. Plasma-arc welding, cutting or marking process, characterized in that it employs a plasma torch according to either of Claims 9 and 10.
  13. Use of an electrode body (3) according to one of Claims 1 to 7 in a plasma torch.
EP98403072A 1997-12-12 1998-12-07 Electrode body/electrode holder assembly for plasma torch Expired - Lifetime EP0923276B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9715751 1997-12-12
FR9715751A FR2772547B1 (en) 1997-12-12 1997-12-12 ELECTRODE BODY / ELECTRODE HOLDER ASSEMBLY FOR PLASMA TORCH
US09/443,116 US6147318A (en) 1997-12-12 1999-11-18 Assembly of electrode body and electrode carrier for a plasma torch
CA002290144A CA2290144A1 (en) 1997-12-12 1999-11-22 Electrode body/electrode holder set for plasma torch

Publications (2)

Publication Number Publication Date
EP0923276A1 EP0923276A1 (en) 1999-06-16
EP0923276B1 true EP0923276B1 (en) 2001-10-17

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EP98403072A Expired - Lifetime EP0923276B1 (en) 1997-12-12 1998-12-07 Electrode body/electrode holder assembly for plasma torch

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US (2) US6147318A (en)
EP (1) EP0923276B1 (en)
CA (1) CA2290144A1 (en)
DE (1) DE69802062T2 (en)
ES (1) ES2165136T3 (en)
FR (1) FR2772547B1 (en)
PT (1) PT923276E (en)

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US7395527B2 (en) 2003-09-30 2008-07-01 International Business Machines Corporation Method and apparatus for counting instruction execution and data accesses
US8381037B2 (en) 2003-10-09 2013-02-19 International Business Machines Corporation Method and system for autonomic execution path selection in an application
US7895382B2 (en) 2004-01-14 2011-02-22 International Business Machines Corporation Method and apparatus for qualifying collection of performance monitoring events by types of interrupt when interrupt occurs
US7415705B2 (en) 2004-01-14 2008-08-19 International Business Machines Corporation Autonomic method and apparatus for hardware assist for patching code
DE102009016932B4 (en) * 2009-04-08 2013-06-20 Kjellberg Finsterwalde Plasma Und Maschinen Gmbh Cooling tubes and electrode holder for an arc plasma torch and arrangements of the same and arc plasma torch with the same
US8338753B2 (en) * 2010-04-30 2012-12-25 Lincoln Global, Inc. Contact tip and diffuser
US10456855B2 (en) 2013-11-13 2019-10-29 Hypertherm, Inc. Consumable cartridge for a plasma arc cutting system
US11684995B2 (en) 2013-11-13 2023-06-27 Hypertherm, Inc. Cost effective cartridge for a plasma arc torch
US11432393B2 (en) 2013-11-13 2022-08-30 Hypertherm, Inc. Cost effective cartridge for a plasma arc torch
US9981335B2 (en) 2013-11-13 2018-05-29 Hypertherm, Inc. Consumable cartridge for a plasma arc cutting system
US11278983B2 (en) 2013-11-13 2022-03-22 Hypertherm, Inc. Consumable cartridge for a plasma arc cutting system
AU2015301727B2 (en) 2014-08-12 2020-05-14 Hypertherm, Inc. Cost effective cartridge for a plasma arc torch
KR102586885B1 (en) 2015-08-04 2023-10-06 하이퍼썸, 인크. Cartridges for liquid-cooled plasma arc torches
US10413991B2 (en) 2015-12-29 2019-09-17 Hypertherm, Inc. Supplying pressurized gas to plasma arc torch consumables and related systems and methods
CZ308703B6 (en) * 2020-02-05 2021-03-03 B&Bartoni, spol. s r.o. Electrode set for plasma arc torch with improved electric current transfer

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US5841095A (en) * 1996-10-28 1998-11-24 Hypertherm, Inc. Apparatus and method for improved assembly concentricity in a plasma arc torch

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Publication number Publication date
FR2772547A1 (en) 1999-06-18
CA2290144A1 (en) 2001-05-22
FR2772547B1 (en) 2000-01-21
EP0923276A1 (en) 1999-06-16
PT923276E (en) 2002-02-28
ES2165136T3 (en) 2002-03-01
DE69802062D1 (en) 2001-11-22
DE69802062T2 (en) 2002-06-20
US6147318A (en) 2000-11-14
US6252194B1 (en) 2001-06-26

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