EP1922908B1 - Procede de fonctionnement d'un chalumeau au plasma de vapeur d'eau et appareil de decoupage a la vapeur d'eau - Google Patents

Procede de fonctionnement d'un chalumeau au plasma de vapeur d'eau et appareil de decoupage a la vapeur d'eau Download PDF

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Publication number
EP1922908B1
EP1922908B1 EP06774763A EP06774763A EP1922908B1 EP 1922908 B1 EP1922908 B1 EP 1922908B1 EP 06774763 A EP06774763 A EP 06774763A EP 06774763 A EP06774763 A EP 06774763A EP 1922908 B1 EP1922908 B1 EP 1922908B1
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Prior art keywords
cathode
anode
workpiece
current
steam
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German (de)
English (en)
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EP1922908A2 (fr
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Heribert Pauser
Alexander Speigner
Andreas Starzengruber
Max Stöger
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Fronius International GmbH
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Fronius International GmbH
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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
    • H05H1/36—Circuit arrangements

Definitions

  • the invention relates to a method for operating a steam plasma burner with a cathode and an anode formed as a nozzle for processing a workpiece, wherein during operation between the cathode and the anode and or or the workpiece via a current source, a current is impressed, wherein after the Igniting a pilot arc between the cathode and the anode as the water vapor plasma torch approaches the workpiece between the cathode and the workpiece forms a working arc and extinguishes the pilot arc by disconnecting the current source from the anode and increasing the current to a predetermined operating current; the working operation, the voltage between the cathode and the workpiece is monitored and to re-create the pilot arc, the power source is switched back to the anode when the voltage exceeds a threshold.
  • the invention relates to a steam cutting machine with a steam plasma burner with a cathode and an anode formed as a nozzle, a power source which is connected to the cathode on the one hand and the workpiece to be machined and the anode on the other hand, with a control device for controlling a switch in the Connection between the current source and the anode, and with means for measuring the voltage between the cathode and the workpiece.
  • the water or the liquid is conducted from a tank via a corresponding line to the burner and heated there by means of a heater to steam and passed through corresponding channels in the combustion chamber, where it generates a plasma as a plasma-forming medium.
  • the plasma jet emerges without current from the nozzle, where it can be used to melt workpieces due to the high energy density.
  • a connection of workpieces can also be carried out by means of a steam plasma burner.
  • the heating element of the steam plasma burner which vaporizes the liquid medium, is turned on so that the operating temperature is reached.
  • the steam plasma burner is in "standby" or idle mode.
  • a so-called pilot arc is ignited between the cathode and the anode.
  • the liquid medium evaporated by the heating element forms the plasma gas, which drives the arc to the outside through the outlet opening of the anode formed as a nozzle. In this state, the burner is in the so-called "non-transmitted mode".
  • a partial current begins to flow across the workpiece to the cathode, resulting in the formation of a working arc between the workpiece and the cathode when a certain current is exceeded.
  • the pilot arc is switched off by switching off the power source and the current is increased to the desired cutting current, so that the machining of the workpiece can be started. This mode is called the "transmitted mode”.
  • the water vapor plasma torch If the water vapor plasma torch is moved away from the workpiece, it may lead to the breaking of the working arc and to the interruption of the machining of the workpiece.
  • the pilot arc has to be ignited and the burner has to be brought into the untransmitted mode and finally into the transmitted mode.
  • the extinction of the arc is a problem, especially in the case of steam plasma burners, since the plasma medium which can still be pumped can lead to a cooling of the burner and thus to interruptions in the work process.
  • the control of switching between not transmitted and transmitted mode is therefore of great importance, in particular for water vapor plasma torches.
  • the US 5,828,030 A shows a plasma torch of the subject type, wherein the voltage between the electrode and the workpiece is measured and fed to a controller. An extinction of the arc is detected by exceeding a certain voltage level. In this case, the switch is closed and the pilot arc is restored, and re-ignition of the arc can be avoided.
  • WO 2004/022276 A1 shows a plasma torch in which various operating currents and voltages are monitored to optimize the switching from the pilot arc into an operating arc.
  • Object of the present invention is to provide an above-mentioned method for operating a steam plasma burner, through which an optimal switching of the operating conditions can be achieved.
  • a substantially uninterrupted machining of workpieces and thus an optimal machining result is to be achieved.
  • Another object of the present invention is to provide an above-mentioned steam cutting apparatus by which optimum operation of the steam plasma burner can be achieved.
  • the first object of the invention is achieved by an above called method in which the power source is disconnected from the anode when the current between the workpiece and cathode exceeds a threshold.
  • the essence of the method according to the invention lies in the rapid switching from the transmitted mode to the non-transmitted mode, as soon as the water vapor plasma torch is moved too far away from the workpiece and the work arc extinction is imminent, and when switching from non-transmitted mode to transmitted mode, as soon as measured current exceeds a defined threshold.
  • the removal of the water vapor plasma torch from the workpiece is determined by measuring the voltage between the cathode and the workpiece.
  • the partial flow between the cathode and the workpiece which begins to flow as the burner approaches the workpiece, is monitored.
  • the pilot arc is extinguished by switching off the current source from the anode, so that only the working arc burns. This represents switching from non-transmitted mode to transmitted mode.
  • the threshold value is adjustable, so that different working parameters and types of burners can be taken into account.
  • different threshold values are dependent on the steam plasma burner used in a memory deposited, and retrievable or adjustable.
  • the working current during operation is advantageously designed to be adjustable.
  • the strength of the working current is adapted to the workpiece to be machined.
  • the current source is switched off after a predetermined period of time from the anode, as soon as the current exceeds the threshold value. Setting this time ensures that the pilot arc will burn for a while before it is cleared. As a result, too high switching frequencies, which would burden the switch, and the occurrence of a vibration are prevented.
  • the time duration can be achieved by starting a timer at the time of detection of the exceeding of the threshold value.
  • the period of time over which the pilot arc must at least burn, before it is extinguished in the range between 1 and 1.4 ms.
  • the threshold value of the current between the workpiece and the cathode is likewise preferably adjustable.
  • the pilot arc can be ignited by applying a high-frequency voltage between the cathode and the anode.
  • the pilot arc is ignited by lifting an axially displaceable cathode of the anode.
  • the cathode at the anode In this state, therefore, there is a short circuit between the cathode and anode.
  • the cathode is preferably automatically lifted by the supplied liquid medium of the steam plasma burner from the anode, so that a pilot arc between the cathode and the anode can be ignited.
  • the voltage between the cathode and the anode is measured and compared with the voltage between the cathode and the workpiece and reduced in accordance with the working current. This ensures that when the cathode and anode meet, the working current is reduced, which leads to protection of the cathode and anode.
  • the voltage between the cathode and the anode can be measured and the detection of a short circuit prevents the current source from being disconnected from the anode.
  • it can be prevented that an arc is ignited when the anode and cathode are short-circuited between the burner and the workpiece. Only after ignition of a pilot arc between the nozzle and cathode, which is possible only when opening the short circuit between the anode and cathode, the switching off of the pilot arc and thus the achievement of the transmitted mode is possible.
  • connection and / or disconnection of the current source from the anode is carried out, for example, in steps or ramps according to a predetermined function, the components can be protected since the switching does not take place abruptly.
  • the flow rate of the water or the liquid of the steam plasma burner is adjustable.
  • the cooling of the burner can be improved by increasing the flow rate.
  • the object of the invention is also achieved by an above-mentioned steam cutting device with a device for measuring the current between the cathode and the workpiece, which is connected to the control device as well as the device for measuring the voltage between the cathode and the workpiece.
  • a device for measuring the current between the cathode and the workpiece By detecting the voltage between the cathode and the workpiece, it can be compared in the control device with a predetermined threshold value and controlled accordingly in the sequence of the switches in the connection between the current source and the anode.
  • the device for measuring the current between the cathode and the workpiece it is possible to switch from the non-transmitted mode to the transmitted mode in the event of a signal being exceeded certain threshold for the current between the cathode and the workpiece.
  • Another advantage is a device for measuring the current between the workpiece and the cathode, which measuring device is connected to the control device. Through this current measuring device the working current can be recorded during operation.
  • control device is formed by an analog circuit, the required or low switching times, in particular when switching from the transmitted mode to the non-transmitted mode, can be achieved. These can usually not be achieved by a software-based solution in a control device formed by a microcontroller.
  • the switch is preferably formed by a transistor, in particular an IGBT (insulated gate bipolar transistor).
  • IGBT insulated gate bipolar transistor
  • a memory for storing predetermined threshold values is provided, which is connected to the control device.
  • a steam cutting machine 1 having a base apparatus 1a for a water vapor cutting method.
  • the basic device 1a comprises a power source 2, a control device 3 and a blocking element 4 associated with the control device 3.
  • the blocking element 4 is connected to a container 5 and a steam plasma burner 6 comprising a burner handle 6a and a burner body 6b via a supply line 7, so that the Steam plasma burner 6 can be supplied with a arranged in the container 5 liquid 8.
  • the supply of the steam plasma burner 6 with electrical energy via lines 9, 10 from the power source. 2
  • a cooling circuit 11 For cooling the steam plasma burner 6 this is connected via a cooling circuit 11 at best with the interposition of a flow monitor 12 with a liquid container 13.
  • the cooling circuit 11 can be started by the control device 3 and thus a cooling of the burner 6 via the cooling circuit 11 can be achieved.
  • the burner 6 is connected via cooling lines 14, 15 with the liquid container 13.
  • the base unit 1a may have an input and / or display device 16, via which the most different parameters or operating modes of the steam cutting device 1 can be set and displayed.
  • the parameters set via the input and / or display device 16 are forwarded to the control device 3, which controls the individual components of the steam cutting device 1 accordingly.
  • the steam plasma burner 6 can have at least one operating element 17, in particular a pushbutton 18, via which the user can inform the controller 3 by activating and / or deactivating the button 18 of the burner 6 that a steam cutting process is started or carried out should.
  • presettings can be made, for example, at the input and / or display device 16, in particular that the material to be cut, the liquid used and, for example, characteristics of the current and the voltage are predefined.
  • further controls on the burner 6 may be arranged via the one or more operating parameters of the steam cutting device 1 are set by the burner 6 from. For this purpose, these controls can be connected directly via lines or via a bus system to the base unit 1a, in particular the control device 3.
  • the control device 3 activates after pressing the button 18, the individual components required for the steam cutting process. For example, first a pump (not shown), the blocking element 4 and the current source 2 are driven, whereby a supply of the burner 6 with the liquid 8 and with electrical energy is introduced. Subsequently, the control device 3 activates the cooling circuit 11, so that a cooling of the burner 6 is made possible. By supplying the burner 6 with the liquid 8 and with energy, in particular with current and voltage, the liquid 8 is now in the burner 6 in a gas 19, in particular in plasma, converted at high temperature, so that by the burner from the sixth outflowing gas 19, a cutting process on a workpiece 20 can be performed.
  • the Fig. 2 to 4 show schematic representations of a steam plasma burner 6 according to the invention in different operating conditions.
  • the steam plasma burner 6 has a housing 21, in which a cathode 22 is arranged, which is connected to the power source 2.
  • the anode 24 formed as a nozzle 23 is connected to the positive pole of the power source 2.
  • a pilot arc between the cathode 22 and the anode 24 For igniting a pilot arc between the cathode 22 and the anode 24, according to Fig. 3 the supply of the liquid medium, in particular water, turned on, whereby the axially displaceable cathode 22 lifts from the nozzle 23 and in the presence a corresponding current a pilot arc between the cathode 22 and the anode 24 is ignited.
  • the ignition of a pilot arc can also be done by connecting a high-frequency voltage.
  • the water evaporated in the heater is conducted into the combustion chamber where it serves as a medium for a plasma jet.
  • the plasma jet is forced out through the opening 25 in the anode 24 formed as a nozzle 23 and can be used for cutting but also joining workpieces 20 due to its high energy density.
  • the steam plasma burner 6 is in the so-called non-transferred mode.
  • a control device 25 which controls a switch 30 between the power source 2 and the anode 24 of the steam plasma burner 6, respectively.
  • the voltage U NUE between the cathode 22 and the anode 24 are detected by means of a voltage meter 26 and the current I UE from the positive pole of the current source 2 to the workpiece 20 by means of an ammeter 28.
  • the voltage U UE between the cathode 22 and the workpiece 20 can be determined with the aid of the voltmeter 27 and the current I CUT from the negative pole of the current source 2 to the cathode 22 of the steam plasma burner with the aid of an ammeter 29.
  • the detected data is supplied to the controller 25 which controls the switch for connecting the positive pole of the power source 2 to the anode 24.
  • it is detected via the voltage U NUE between the cathode 22 and the anode 24 of the steam plasma burner , which is detected by means of the voltage measuring device 26, when the short circuit between the cathode 22 and the anode or nozzle 24 has been canceled. Only then can the pilot arc between the cathode 22 and the anode 24 be ignited.
  • a small partial current I UE begins to flow over the transmitted current path. If the current I UE measured with the aid of the ammeter 28 exceeds a defined threshold value I UEs for the workpiece 20, the switch 30 is actuated by the control device 25 and thus the power source 2 is disconnected from the anode 24. As a result, the arc forcibly deflects from the cathode 22 to the workpiece 20 and the current of the current source 2 can be increased to a specific cutting current I CUT . In this case, the steam plasma burner 6 is in the so-called transferred mode.
  • the voltage between the cathode 22 and the workpiece increases as the current source 2 tends to maintain the adjusted cutting current I CUT .
  • the switch 30 is in turn closed and thus the anode 24 is again connected to the positive pole of the current source 2 in order to prevent the arc from tearing off.
  • the steam plasma burner 6 is again in the non-transferred mode according to Fig. 3 ,
  • the mode transmitted and not transmitted between the two operating states is changed as needed. It is important that the control of the switch 30 is very fast.
  • Analogously designed control devices 25 are more suitable for this purpose than implementations by microcontrollers.
  • This automatic control of the arc is of great importance when cutting certain workpieces, such as perforated sheets. In this case, it would come to an extinction of the arc by constantly changing the distance between the workpiece and the burner, which would require a re-ignition of the pilot arc.
  • pulsing the flow may be beneficial to some materials for cutting quality.
  • the inventive method the energy input is reduced.
  • control device 3 acts in the switching process.
  • a switching signal must be generated or deleted by the control device 3, wherein the control device 3 releases the switch 30 only when a threshold value for the switching signal is exceeded, ie, that only For example, if the switching signal exceeds 50V, switching from the non-transmitted mode to the transmitted mode is possible.
  • a threshold value for the switching signal ie, that only For example, if the switching signal exceeds 50V, switching from the non-transmitted mode to the transmitted mode is possible.
  • the analog control device 25 By the release of the control device 3, it is then possible for the analog control device 25 to open the switch 30 so that the arc can then be switched to the workpiece 20. This ensures that no arc can burn between the nozzle 23 and the workpiece 20 without the cathode 22 being lifted from the anode 24. For example, if the cathode 22 is not removed from the anode 24, it would not be possible during operation to switch between the transmitted mode and the non-transmitted mode. This also ensures that a safe heating of the burner 6 is achieved via the pilot arc, so that only water vapor exits the burner 6. By this intervention of the control device 3, this is prevented, since only an ignition between the nozzle 23 and cathode 24 must be made to clear this signal or to generate a corresponding signal, so that switching of the switch 30 is possible.
  • control device 3 can also take place in such a way that in the transmitted mode, ie where the arc between the workpiece 20 and cathode 22 burns when switching back to the non-transferred mode, ie the pilot arc, the control device 3 monitors the pilot arc. ie, that the pilot arc over a certain period of time, preferably 1.2msec, must burn between the nozzle 23 and the cathode 24, whereupon it is queried where the current now flows before the arc can be switched back to the workpiece 20 or the pilot arc is maintained. This ensures that a swing, so switch back and forth, can not occur because the switch used 30 high switching frequencies can not stand.
  • circuit design can be digital or analog, whereby the control means 25 is integrated in the control device 3 or realized by this in a digital structure.

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

Abstract

L'invention concerne un procédé de fonctionnement d'un chalumeau au plasma/vapeur d'eau (6) comprenant une cathode (22) et une anode (24) se présentant sous la forme d'une buse (23), et permettant d'usiner une pièce (20). Pendant le fonctionnement, un courant est cédé entre la cathode (22) et l'anode (24) et/ou la pièce (20) par une source de courant (2). Après allumage d'un arc électrique pilote entre la cathode (22) et l'anode (24) lors que le chalumeau à plasma/vapeur d'eau (6) s'approche de la pièce (20), un arc électrique de travail se forme entre la cathode (22) et la pièce (20) ; l'arc électrique pilote est supprimé de l'anode (24) par déconnexion de la source de courant (2) et le courant est augmenté à un courant de travail donné. Pour obtenir un fonctionnement optimal d'un chalumeau au plasma/vapeur d'eau, on surveille pendant le mode marche la tension (UUE) entre la cathode (22) et la pièce (20) et pour la reformation de l'arc électrique pilote, la source de courant (2) est à nouveau branchée à l'anode (24) dès que la tension (UUE) dépasse une valeur seuil (IUEs).

Claims (19)

  1. Procédé de fonctionnement d'un chalumeau à plasma de vapeur d'eau (6) comprenant une cathode (22) et une anode (24) conformée en buse (23) pour usiner une pièce (20), dans lequel, au cours du fonctionnement entre la cathode (22) et l'anode (24) et/ou la pièce (20), on applique un courant via une source de courant (2), dans lequel, après amorçage d'un arc électrique pilote entre la cathode (22) et l'anode (24), lorsque l'on approche le chalumeau à plasma de vapeur d'eau (6) de la pièce (20), il se forme entre la cathode (22) et la pièce (20) un arc électrique de travail et l'arc électrique pilote est éteint par déconnexion de la source de courant (2) au niveau de l'anode (24), et dans lequel, au cours de l'opération de travail, la tension (UUE) entre la cathode (22) et la pièce (20) est surveillée et, pour réamorcer l'arc électrique pilote, la source de courant est à nouveau connectée à l'anode (24) aussitôt que la tension (UUE) dépasse une valeur de seuil (UUES), caractérisé en ce que la source de courant (2) est déconnectée de l'anode (24) lorsque le courant (IUE) entre la pièce (20) et la cathode (22) dépasse une valeur de seuil (IUES) si bien que seul brûle encore l'arc électrique de travail.
  2. Procédé selon la revendication 1, caractérisé en ce que la valeur de seuil (UUES) est réglable.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que diverses valeurs de seuil (UUES) sont enregistrées et réglables en fonction du chalumeau à plasma de vapeur d'eau (6) utilisé.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le courant de travail (ICUT) peut être réglé au cours de l'opération de travail.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la source de courant (2) est déconnectée de l'anode (24) après une période de temps prédéterminée (Δt), aussitôt que le courant (IUE) dépasse la valeur de seuil (IUES).
  6. Procédé selon la revendication 5, caractérisé en ce que la période de temps (Δt) atteint 1 à 1,4 ms.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la valeur de seuil (IUES) du courant est réglable.
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'arc électrique pilote est amorcé par application d'une tension de haute fréquence entre la cathode (22) et l'anode (24).
  9. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'arc électrique pilote est amorcé en retirant une cathode (22) déplaçable axialement de l'anode (24).
  10. Procédé selon la revendication 9, caractérisé en ce que, au cours de l'opération de travail, la tension (UNUE) entre la cathode (22) et l'anode (24) est mesurée et comparée à la tension (UNUE) entre la cathode (22) et la pièce (20) et le courant de travail est réduit lorsqu'il y a concordance.
  11. Procédé selon la revendication 9 ou 10, caractérisé en ce que la tension (UNUE) entre la cathode (22) et l'anode (24) est mesurée et en ce qu'on empêche la déconnexion de la source de courant (2) de l'anode (24) lorsqu'un court-circuit est détecté.
  12. Procédé selon l'une quelconque des revendications 1 à 11, caractérisé en ce que la connexion et/ou la déconnexion de la source de courant (2) avec l'anode (24) se fait/font selon une fonction prédéterminée, par exemple par paliers ou par degrés.
  13. Procédé selon l'une quelconque des revendications 1 à 12, caractérisé en ce que le coefficient de débit de l'eau du chalumeau à plasma de vapeur d'eau (6) est réglé.
  14. Appareil de découpe à vapeur d'eau (1) comprenant un chalumeau à plasma de vapeur d'eau (6) avec une cathode (22) et une anode (24) conformée en buse (23), une source de courant (2), qui est connectée, d'une part, à la cathode, d'autre part à la pièce à usiner (20) et à l'anode (24), avec un dispositif de commande (25) pour commander un commutateur (30) dans la connexion entre la source de courant (2) et l'anode (24), et avec un dispositif (27) pour mesurer la tension (UUE) entre la cathode (22) et la pièce (20), caractérisé en ce qu'il est prévu un dispositif (28) pour mesurer le courant (IUE) entre la cathode (22) et la pièce (20) et en ce que les dispositifs de mesure (27, 28) sont connectés au dispositif de commande (25) de sorte que la source de courant est déconnectée de l'anode lorsqu'une valeur de seuil (IUES) déterminée pour le courant (IUE) entre la cathode et la pièce est dépassée.
  15. Appareil de découpe à vapeur d'eau (1) selon la revendication 14, caractérisé en ce qu'il est prévu un dispositif (29) pour mesurer le courant (ICUT) entre la cathode (22) et la pièce (20), lequel dispositif de mesure (29) est connecté au dispositif de commande (25).
  16. Appareil de découpe à vapeur d'eau (1) selon la revendication 14 ou 15, caractérisé en ce qu'il est prévu un dispositif (26) pour mesurer la tension entre la cathode (22) et l'anode (24), lequel dispositif de mesure (26) est connecté au dispositif de commande (25).
  17. Appareil de découpe à vapeur d'eau (1) selon l'une quelconque des revendications 14 à 16, caractérisé en ce que le dispositif de commande (25) est formé par un circuit analogique.
  18. Appareil de découpe à vapeur d'eau (1) selon l'une quelconque des revendications 14 à 17, caractérisé en ce que le commutateur (30) est formé par un transistor, en particulier un IGBT (transistor bipolaire à grille isolée).
  19. Appareil de découpe à vapeur d'eau (1) selon l'une quelconque des revendications 14 à 18, caractérisé en ce qu'il est prévu une mémoire pour mémoriser des valeurs de seuil prédéterminés, laquelle mémoire est connectée au dispositif de commande (25).
EP06774763A 2005-09-09 2006-09-06 Procede de fonctionnement d'un chalumeau au plasma de vapeur d'eau et appareil de decoupage a la vapeur d'eau Not-in-force EP1922908B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0148205A AT502422B1 (de) 2005-09-09 2005-09-09 Verfahren zum betreiben eines wasserdampfplasmabrenners und wasserdampf-schneidgerät
PCT/AT2006/000365 WO2007028182A2 (fr) 2005-09-09 2006-09-06 Procede de fonctionnement d'un chalumeau au plasma/vapeur d'eau et appareil de decoupe a la vapeur d'eau

Publications (2)

Publication Number Publication Date
EP1922908A2 EP1922908A2 (fr) 2008-05-21
EP1922908B1 true EP1922908B1 (fr) 2012-04-11

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EP06774763A Not-in-force EP1922908B1 (fr) 2005-09-09 2006-09-06 Procede de fonctionnement d'un chalumeau au plasma de vapeur d'eau et appareil de decoupage a la vapeur d'eau

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US (1) US20090266799A1 (fr)
EP (1) EP1922908B1 (fr)
JP (1) JP4907660B2 (fr)
CN (1) CN101288347B (fr)
AT (2) AT502422B1 (fr)
WO (1) WO2007028182A2 (fr)

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DE102014216505A1 (de) 2013-08-27 2015-03-05 Fronius International Gmbh Verfahren und Vorrichtung zur Erzeugung eines Plasmastrahls

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JPWO2012172630A1 (ja) * 2011-06-13 2015-02-23 トヨタ自動車株式会社 表面加工装置及び表面加工方法
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CN110434905A (zh) * 2019-09-02 2019-11-12 包丽珠 一种利用直流电逆变切割纤维的震荡式刀具

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US20090266799A1 (en) 2009-10-29
ATE553635T1 (de) 2012-04-15
EP1922908A2 (fr) 2008-05-21
CN101288347B (zh) 2012-12-26
WO2007028182A2 (fr) 2007-03-15
JP2009506892A (ja) 2009-02-19
AT502422B1 (de) 2007-06-15
JP4907660B2 (ja) 2012-04-04
CN101288347A (zh) 2008-10-15
AT502422A1 (de) 2007-03-15
WO2007028182A3 (fr) 2007-07-26

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