EP3268161A1 - Method for avoiding overload on the burner nozzle of a plasma torch - Google Patents

Method for avoiding overload on the burner nozzle of a plasma torch

Info

Publication number
EP3268161A1
EP3268161A1 EP16711788.6A EP16711788A EP3268161A1 EP 3268161 A1 EP3268161 A1 EP 3268161A1 EP 16711788 A EP16711788 A EP 16711788A EP 3268161 A1 EP3268161 A1 EP 3268161A1
Authority
EP
European Patent Office
Prior art keywords
gas flow
current
nominal value
plasma torch
plasma
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16711788.6A
Other languages
German (de)
French (fr)
Inventor
Ni Cheng
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.)
Oerlikon Metco AG
Original Assignee
Oerlikon Metco AG
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 Oerlikon Metco AG filed Critical Oerlikon Metco AG
Publication of EP3268161A1 publication Critical patent/EP3268161A1/en
Withdrawn legal-status Critical Current

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K10/00—Welding or cutting by means of a plasma
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K10/00—Welding or cutting by means of a plasma
    • B23K10/006—Control circuits therefor
    • 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
    • H05H1/3494—Means for controlling discharge parameters

Definitions

  • the present invention relates to a control method for plasma torches. In particular, it is a matter of extending the life of an electrode or the electrodes of a plasma torch.
  • Plasma burners or plasma arc burners are known. This type of burners comprises two electrodes, namely an anode and a cathode. An arc is formed between the electrodes and a plasma-forming gas is injected. The arc formed between the electrodes is maintained, bringing the gas to very high temperatures and ionizing it.
  • the electrodes are consumable parts. Lifespan is a function of a number of parameters, such as the performance of the burner, the nature of the injected, plasma-forming gas due to its decomposition, and the reactions it can have with the materials forming the electrodes. The life of the electrodes is also a function of the operation of the burner, depending on whether it is operated continuously or discontinuously.
  • the present invention is therefore an object of the invention to provide a method in which it does not come to the unwanted whhügel.
  • FIG. 2 shows the corresponding sequence according to the invention in a graph. Plotted is an amplitude as a function of time. The dashed line indicates schematically the gas flow. The dashed line indicates schematically the current. The dotted line indicates the nominal value of the power, i. the power limit. The solid line indicates the actual power. It is clearly visible that this does not lead to a performance hill.
  • the power remains lower than or equal to the predetermined nominal power at any time during the start or during the change of recipe.
  • a method for starting a recipe in a plasma torch comprising the steps of:
  • the inventive method is characterized in that during the adjustment of the gas flow to the Gashnenominalwert the current is controlled so that it is always below the StromSnnominalhongs such that it does not come to a power hill.
  • the current value can be maintained at a substantially constant value below the current nominal value and the current value adjusted to the nominal current value only after stabilization of the gas flow. It may be in the process to a recipe change. Then, preferably, the current is kept high all the time, so that the plasma does not go out.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Vapour Deposition (AREA)
  • Drying Of Semiconductors (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Discharge Heating (AREA)
  • Plasma Technology (AREA)

Abstract

The invention relates to a method for starting a formulation in a plasma torch, the method comprising the following steps: - adjusting a current intensity to a current intensity nominal value, and - adjusting a gas flow to a gas flow nominal value, characterized in that during adjustment of the gas flow to the gas flow nominal value the current intensity is regulated such that it is always below the current intensity nominal value so that no intensity peak is produced.

Description

Verfahren zur Vermeidung von Überlast an der Brennerdüse eines Plasmabrenners  Method for avoiding overload on the burner nozzle of a plasma torch
Die vorliegende Erfindung bezieht sich auf ein Steuerungsverfahren für Plasmabrenner Insbesondere geht es darum, die Lebensdauer einer Elektrode oder der Elektroden eines Plasmabrenners zu verlängern. The present invention relates to a control method for plasma torches. In particular, it is a matter of extending the life of an electrode or the electrodes of a plasma torch.
Plasmabrenner oder Plasmalichtbogenbrenner sind bekannt. Diese Art von Brennern umfasst zwei Elektroden, nämlich eine Anode und eine Kathode. Es wird ein Lichtbogen zwischen den Elektroden gebildet und es wird ein plasmabildendes Gas injiziert. Der sich zwischen den Elektroden bildende Lichtbogen wird aufrechterhalten und bringt das Gas auf sehr hohe Temperaturen und ionisiert es. Plasma burners or plasma arc burners are known. This type of burners comprises two electrodes, namely an anode and a cathode. An arc is formed between the electrodes and a plasma-forming gas is injected. The arc formed between the electrodes is maintained, bringing the gas to very high temperatures and ionizing it.
Bei einem derartigen Plasmabrenner sind die Elektroden verbrauchsteile. Die Lebensdauer ist eine Funktion einer Reihe von Parametern, wie zum Beispiel der Leistung des Brenners, der Natur des injizierten, plasmabildenden Gases aufgrund seiner Zersetzung und der Reaktionen, dies es mit den die Elektroden bildenden Materialien haben kann. Die Lebensdauer der Elektroden ist ausserdem eine Funktion des Betriebes des Brenners, je nachdem, ob dieser kontinuierlich oder diskontinuierliche betrieben wird. In such a plasma torch, the electrodes are consumable parts. Lifespan is a function of a number of parameters, such as the performance of the burner, the nature of the injected, plasma-forming gas due to its decomposition, and the reactions it can have with the materials forming the electrodes. The life of the electrodes is also a function of the operation of the burner, depending on whether it is operated continuously or discontinuously.
Beim Starten des Plasmaprozesses und/oder beim Rezepturwechsel werden gemäss Stand der Technik Strom und Prozessgas gleichzeitig geändert, wobei natürlich die Stromstärke schneller ihren Sollwert erreicht als der Gasfluss. Um eine beschleunigte Regulation des Gasflusses und damit ein schnelleres Erreichen des Sollwertes zu erzielen, wird häufig zunächst der Gasfluss auf maximal eingestellt und anschliessend auf den Sollwert zurück reguliert. Dies, in Kombination mit der Tatsache, dass die Stromstärke sehr schnell ihren Sollwert erreicht, hat zur Folge, dass die Leistung während des Startes oder während des Rezeptwechsels kurzzeitig den Nominalwert übersteigt, insbesondere weil bei bereits erreichtem Stromsollwert kurzzeitig ein zu grosser Gasfluss vorliegt, der dann zurück reguliert wird. Eine solche Überschreitung des Nominalwertes führt einerseits zu einer kürzeren Lebensdauer der Elektroden und damit des Brenners und andererseits zu einem erhöhten Stromverbrauch. Eine solchen Ablauf zeigt der Graph in Figur 1 . Dabei wird deutliche, dass die Leistung (durchgezogene Linie) für eine gewisse Zeit den die Leistungsgrenze (gepunktete Linie) überschreitet. When starting the plasma process and / or the recipe change according to the prior art, electricity and process gas are changed simultaneously, of course, the current reaches its setpoint faster than the gas flow. In order to achieve an accelerated regulation of the gas flow and thus a faster achievement of the setpoint, the gas flow is often first set to maximum and then back regulated to the setpoint. This, in combination with the fact that the current reaches its setpoint very quickly, has the consequence that the power briefly exceeds the nominal value during the start or during the recipe change, in particular because there is a too large gas flow for a short time when the current setpoint has already been reached then back regulated. On the one hand, such exceeding of the nominal value leads to a shorter service life of the electrodes and thus of the burner and, on the other hand, to an increased power consumption. Such a sequence is shown by the graph in FIG. 1. It becomes clear that the power (solid line) for a certain time exceeds the power limit (dotted line).
Es wäre natürlich möglich die Rampe der Gasregelung zeitlich zu dehnen um den unerwünschten Leistungshügel zu vermindern. In diesem Fall wird aber die Sequenz für den Start oder Rezepturwechsel zeitlich verzögert, was wiederum einen erhöhten Gas - oder Stromverbrauch zur Folge hat. Ausserdem lässt sich auf diese Weise der Leistungshügel nicht komplett vermeiden. It would of course be possible to extend the ramp of the gas control in order to reduce the unwanted power hill. In this case, however, the sequence for the start or recipe change is delayed in time, which in turn causes an increased gas or Power consumption results. In addition, the power hill can not be completely avoided in this way.
Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren anzugeben, bei dem es nicht zu dem unerwünschten Leistungshügel kommt. The present invention is therefore an object of the invention to provide a method in which it does not come to the unwanted Leistungshügel.
Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass vor und auch während der Gasregelung die Stromstärke auf einem niedrigen Niveau gehalten wird. Erst nachdem der Gasfluss geregelt und stabil ist wird die Stromstärke auf ihren Sollwert eingeregelt. Figur 2 zeigt den entsprechenden erfindungsgemässen Ablauf in einem Graphen. Aufgetragen ist eine Amplitude in Abhängigkeit der Zeit. Die gestrichelte Linie gibt schematisch den Gasfluss an. Die Strichpunktlinie gibt schematisch die Stromstärke an. Die gepunktete Linie gibt den Nominalwert der Leistung, d.h. die Leistungsgrenze an. Die durchgezogene Linie gibt die tatsächliche Leistung an. Deutlich sichtbar ist, dass es hierbei nicht zu einem Leistungshügel kommt. According to the invention the object is achieved in that before and also during the gas control, the current is kept at a low level. Only after the gas flow is regulated and stable is the current regulated to its setpoint. FIG. 2 shows the corresponding sequence according to the invention in a graph. Plotted is an amplitude as a function of time. The dashed line indicates schematically the gas flow. The dashed line indicates schematically the current. The dotted line indicates the nominal value of the power, i. the power limit. The solid line indicates the actual power. It is clearly visible that this does not lead to a performance hill.
Durch das erfindungsgemässe Verfahren wird erreicht, dass die Leistung während des Startes oder während des Rezepturwechsels zu jedem Zeitpunkt tiefer als oder gleich der vorgegebenen nominalen Leistung bleibt. By means of the method according to the invention, it is achieved that the power remains lower than or equal to the predetermined nominal power at any time during the start or during the change of recipe.
Es wurde ein Verfahren zum Starten einer Rezeptur in einem Plasmabrenner offenbart, wobei das Verfahren folgende Schritte umfasst: A method for starting a recipe in a plasma torch has been disclosed, the method comprising the steps of:
- Einstellung einer Stromstärke auf einen Stromstärkennominalwert  - Setting a current to a nominal current value
- Einstellung eines Gasflusses auf einen Gasflussnominalwert  - Setting a gas flow to a gas flow nominal value
Das erfindungsgemässe Verfahren zeichnet sich dadurch aus, dass während der Einstellung des Gasflusses auf den Gasflussnominalwert die Stromstärke so geregelt wird, dass sie immer unterhalb des Stromstärkennominalwertes liegt dergestalt, dass es nicht zur einem Leistungshügel kommt. The inventive method is characterized in that during the adjustment of the gas flow to the Gasflussnominalwert the current is controlled so that it is always below the Stromstärkennominalwertes such that it does not come to a power hill.
Gemäss einer Ausführungsform der vorliegenden Erfindung kann die Stromstärke während der Einstellung des Gasflusses auf den Gasflussnominalwert auf einem im Wesentlichen konstanten Wert unterhalb des Stromstärkennominalwertes gehalten werden und die Stromstärke erst nach Stabilisierung des Gasflusses auf den Stromstärkennominalwert eingestellt werden. Es kann sich bei dem Verfahren um einen Rezepturwechsel handeln. Dann wird vorzugsweise die Stromstärke die ganze Zeit so hoch gehalten wird, so dass das Plasma nicht erlischt. According to one embodiment of the present invention, during the adjustment of the gas flow to the gas flow nominal value, the current value can be maintained at a substantially constant value below the current nominal value and the current value adjusted to the nominal current value only after stabilization of the gas flow. It may be in the process to a recipe change. Then, preferably, the current is kept high all the time, so that the plasma does not go out.

Claims

Ansprüche claims
1 . Verfahren zum Starten einer Rezeptur in einem Plasmabrenner, wobei das Verfahren folgende Schritte umfasst: 1 . A method for starting a recipe in a plasma torch, the method comprising the steps of:
- Einstellung einer Stromstärke auf einen Stromstärkennominalwert  - Setting a current to a nominal current value
- Einstellung eines Gasflusses auf einen Gasflussnominalwert  - Setting a gas flow to a gas flow nominal value
dadurch gekennzeichnet, dass während der Einstellung des Gasflusses auf den Gasflussnominalwert die Stromstärke so geregelt wird, dass sie immer unterhalb des Stromstärkennominalwertes liegt dergestalt, dass es nicht zur einem Leistungshügel kommt. characterized in that during the adjustment of the gas flow to the gas flow nominal value, the current intensity is controlled so that it is always below the current intensity nominal value such that it does not come to a power hill.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Stromstärke während der Einstellung des Gasflusses auf den Gasflussnominalwert auf einem im Wesentlichen konstanten Wert unterhalb des Stromstärkennominalwertes gehalten wird und die Stromstärke erst nach Stabilisierung des Gasflusses auf den Stromstärkennominalwert eingestellt wird. 2. The method according to claim 1, characterized in that the current during the adjustment of the gas flow to the Gasflussnominalwert is maintained at a substantially constant value below the Stromstärkennominalwertes and the current is adjusted only after stabilization of the gas flow to the Stromstärkennominalwert.
3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, dass es sich bei dem Verfahren um einen Rezepturwechsel handelt und dass die Stromstärke die ganze Zeit so hoch gehalten wird, so dass das Plasma nicht erlischt. 3. The method according to any one of claims 1 and 2, characterized in that it is in the process of a recipe change and that the current is kept high all the time, so that the plasma does not go out.
EP16711788.6A 2015-03-10 2016-03-08 Method for avoiding overload on the burner nozzle of a plasma torch Withdrawn EP3268161A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015002939 2015-03-10
PCT/EP2016/054924 WO2016142383A1 (en) 2015-03-10 2016-03-08 Method for avoiding overload on the burner nozzle of a plasma torch

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EP3268161A1 true EP3268161A1 (en) 2018-01-17

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EP16711788.6A Withdrawn EP3268161A1 (en) 2015-03-10 2016-03-08 Method for avoiding overload on the burner nozzle of a plasma torch

Country Status (6)

Country Link
US (1) US20180035526A1 (en)
EP (1) EP3268161A1 (en)
JP (1) JP2018508099A (en)
CN (1) CN107614183B (en)
CA (1) CA2977882A1 (en)
WO (1) WO2016142383A1 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3112116B2 (en) * 1991-03-20 2000-11-27 株式会社小松製作所 Plasma cutting machine and control method thereof
JP3822304B2 (en) * 1997-02-28 2006-09-20 小池酸素工業株式会社 Power supply for plasma processing
US6133543A (en) * 1998-11-06 2000-10-17 Hypertherm, Inc. System and method for dual threshold sensing in a plasma ARC torch
US7030335B2 (en) * 2000-03-17 2006-04-18 Applied Materials, Inc. Plasma reactor with overhead RF electrode tuned to the plasma with arcing suppression
CN101495262B (en) * 2005-03-11 2014-11-12 魄金莱默有限公司 Plasmas and methods of using them
DE102009027785A1 (en) * 2009-07-16 2011-01-20 Linde Aktiengesellschaft Plasma keyhole welding of a workpiece using a process gas, comprises temporally changing the gas volume flow rate and/or gas composition of the process gas during a welding process as a function of a basic condition of the welding process
US9427820B2 (en) * 2012-10-19 2016-08-30 Hypertherm, Inc. Thermal torch lead gas delivery methods and related systems and devices

Also Published As

Publication number Publication date
WO2016142383A1 (en) 2016-09-15
JP2018508099A (en) 2018-03-22
CN107614183A (en) 2018-01-19
CA2977882A1 (en) 2016-09-15
US20180035526A1 (en) 2018-02-01
CN107614183B (en) 2020-02-14

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