JPH0544797B2 - - Google Patents
Info
- Publication number
- JPH0544797B2 JPH0544797B2 JP11507885A JP11507885A JPH0544797B2 JP H0544797 B2 JPH0544797 B2 JP H0544797B2 JP 11507885 A JP11507885 A JP 11507885A JP 11507885 A JP11507885 A JP 11507885A JP H0544797 B2 JPH0544797 B2 JP H0544797B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- electrode
- workpiece
- tip
- insert
- 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
Links
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 15
- 230000001590 oxidative effect Effects 0.000 description 7
- 229910044991 metal oxide Inorganic materials 0.000 description 4
- 150000004706 metal oxides Chemical class 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Arc Welding In General (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、プラズマアークにより被加工物を加
工するプラズマアークトーチに関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a plasma arc torch for processing a workpiece using a plasma arc.
従来の技術
一般に、プラズマアークトーチにおいては、被
加工物と電極との間にアーク放電を生起させ、適
宜の作動ガスをノズルから噴射させたプラズマジ
エツトにより加工を行なつている。2. Description of the Related Art Generally, in a plasma arc torch, arc discharge is generated between a workpiece and an electrode, and processing is performed using a plasma jet in which an appropriate working gas is injected from a nozzle.
この種の作動ガスとしては、窒素、アルゴン、
水素等の不活性もしくは還元性のガスが用いられ
たり、酸素、空気等の酸化性のガスが用いられた
りしているが、低廉なことおよび入手が容易なこ
となどの理由で、酸化性のガスが作動ガスとして
使用される場合が殆んどである。 Working gases of this type include nitrogen, argon,
Inert or reducing gases such as hydrogen are used, and oxidizing gases such as oxygen and air are used, but oxidizing gases such as oxygen and air are used. In most cases, gas is used as the working gas.
ところで、プラズマアークトーチの先端要部
は、概略的には第１図に示される構造に形成され
ることが多い。 By the way, the main part of the tip of a plasma arc torch is often formed in the structure schematically shown in FIG. 1.
従来、この種のトーチにおいて、電極１および
ノズル３に、例えば金属酸化物材料を適宜に被覆
することにより電極１およびノズル３を酸化性の
ガスから遮断して、電極１およびノズル３の酸化
を防止していた。即ち酸化に伴なう電極１および
ノズル３の消耗の低減化を計つていた。 Conventionally, in this type of torch, the electrode 1 and the nozzle 3 are shielded from oxidizing gas by appropriately coating the electrode 1 and the nozzle 3 with, for example, a metal oxide material to prevent oxidation of the electrode 1 and the nozzle 3. It was being prevented. In other words, the aim was to reduce wear and tear on the electrode 1 and nozzle 3 due to oxidation.
発明が解決しようとする問題点
しかし、アーク放電に着目した場合、電極１お
よびノズル３に被覆された金属酸化物の存在下に
おいては、アークの放電点、即ち陰極点が移り易
いため、導電性のノズル３を介して電極１と被加
工物４との間にダブルアークが生起されるという
虞れがあつた。また、上記のごとく金属酸化物材
料を被覆する場合、溶射や焼付けなどにより実施
されているが、この場合、被覆された金属酸化物
材料の表面は粗面となるため、例えば、ノズル３
の表面部にスパツタやドロスが付着していた。こ
のスパツタやドロスの付着がダブルアークの発生
を促し、かつ堆積したスパツタやドロスが間歇的
に落下するため加工作業上好ましくなかつた。Problems to be Solved by the Invention However, when focusing on arc discharge, in the presence of the metal oxide coated on the electrode 1 and the nozzle 3, the discharge point of the arc, that is, the cathode point, tends to shift, so the conductivity There was a risk that a double arc would be generated between the electrode 1 and the workpiece 4 through the nozzle 3. In addition, when coating a metal oxide material as described above, it is carried out by thermal spraying or baking, but in this case, the surface of the coated metal oxide material becomes a rough surface, so for example, the nozzle 3
There were spatter and dross attached to the surface. This adhesion of spatter and dross promotes the generation of double arcs, and the accumulated spatter and dross intermittently falls, which is unfavorable for machining operations.
問題点を解決するための手段
本発明は、上記従来の問題点に着目してなされ
たもので、プラズマアークトーチにおいて、電極
先端部に設けられた高融点の挿入体を除く電極の
表面と導電性のノズルの内外面とにNi又はCrの
いずれかを含む電気メツキ層を配設することによ
り上記問題点を解決している。Means for Solving the Problems The present invention has been made by focusing on the above-mentioned problems of the conventional art. The above problem is solved by providing an electroplated layer containing either Ni or Cr on the inner and outer surfaces of the magnetic nozzle.
作 用
高融点の挿入体を除く電極の表面と導電性のノ
ズルの内外面とにNi又はCrのいずれかを含む電
気メツキ層が配設されていて、このNi又はCrの
いずれかを含む電気メツキ層が陰極電子の放出を
難渋とするため、プラズマ放電は高融点の挿入体
と被加工物との間に発生することとなる。すなわ
ち、従来生起していたダブルアークは皆無とな
る。勿論、Ni又はCrのいずれかを含む電気メツ
キ層は表面が滑らかな状態であるため、特に、ノ
ズルの外面には、スパツタやドロスが殆んど付着
することはない。さらに、挿入体を除く電極の表
面と導電性のノズルの内外面とにNi又はCrのい
ずれかを含む電気メツキ層が配設されているた
め、酸化性のガスを用いても電極およびノズルが
容易に酸化されることはなく、従つて電極および
ノズルの使用時間を延長することができる。Function An electroplated layer containing either Ni or Cr is provided on the surface of the electrode excluding the high melting point insert and on the inner and outer surfaces of the conductive nozzle. Since the plating layer makes it difficult for cathode electrons to be emitted, plasma discharge occurs between the high melting point insert and the workpiece. In other words, the double arc that conventionally occurred is completely eliminated. Of course, since the electroplated layer containing either Ni or Cr has a smooth surface, hardly any spatter or dross adheres to the outer surface of the nozzle. Furthermore, since an electroplated layer containing either Ni or Cr is provided on the surface of the electrode excluding the insert and on the inner and outer surfaces of the conductive nozzle, the electrode and nozzle will remain stable even when oxidizing gas is used. It is not easily oxidized, thus extending the usage time of the electrode and nozzle.
実施例
第１図はプラズマアークトーチの先端要部を概
略的に示す図であつて、１は電極で、例えば、銅
又は銅合金により形成されている。２は電極１の
先端部に設けられた高融点の挿入体で、例えば、
ハフニウム、ジルコニウムあるいはこれらを基礎
とする合金により形成されている。３は電極１の
先端部を電気絶縁的にかつ同軸的に覆う導電性の
ノズルで、例えば、銅又は銅合金により形成され
ている。このノズル３には先端部を軸方向に貫通
する小径孔３０１が穿設されている。上記におい
て挿入体２を除く電極１の表面およびノズル３の
内外面にはNi又はCrのいずれかを含む電気メツ
キ層が配設されている。Embodiment FIG. 1 is a diagram schematically showing the main part of the tip of a plasma arc torch, and 1 is an electrode, which is made of, for example, copper or a copper alloy. 2 is a high melting point insert provided at the tip of the electrode 1, for example,
It is made of hafnium, zirconium, or an alloy based on these. Reference numeral 3 denotes a conductive nozzle that electrically insulatingly and coaxially covers the tip of the electrode 1, and is made of, for example, copper or a copper alloy. This nozzle 3 has a small diameter hole 301 that passes through the tip in the axial direction. In the above, an electroplated layer containing either Ni or Cr is provided on the surface of the electrode 1 excluding the insert 2 and on the inner and outer surfaces of the nozzle 3.
上記構成において、電極１と被加工物４との間
に電流を供給しつつ、少なくとも電極１とノズル
３との間に作動ガス、例えば酸化性のガスを供給
して、ノズル３の小径孔３０１より噴出するプラ
ズマジエツトにより被加工物４の加工を行なう。 In the above configuration, while supplying current between the electrode 1 and the workpiece 4, a working gas such as an oxidizing gas is supplied between at least the electrode 1 and the nozzle 3, and the small diameter hole 301 of the nozzle 3 is The workpiece 4 is processed by the plasma jet ejected from the plasma jet.
なお、通常、ノズル３は被加工物４から離間し
て使用するが、ノズル３の下端部を被加工物４の
表面に当接して加工する場合にも適用することが
できる。 Although the nozzle 3 is normally used apart from the workpiece 4, the present invention can also be applied to a case where the lower end of the nozzle 3 is brought into contact with the surface of the workpiece 4.
即ち、特にノズルの外面にはNi又はCrのいず
れかを含む電気メツキ層が形成されていて、この
電気メツキ層の表面が滑らかな状態であるため、
被加工物表面に当接するノズルの移行が容易とな
り、トーチの操作性が改善される。さらに、電極
１およびノズル３の内部に適宜の形状の空間部を
設けて、夫々を冷却したり、あるいは、ノズル３
の外部に冷却機構を設けることができる。勿論、
上記において、作動ガスとして、不活性もしくは
還元性のガスを用いることもできる。この場合、
溶接作業に好適である。 That is, in particular, an electroplated layer containing either Ni or Cr is formed on the outer surface of the nozzle, and the surface of this electroplated layer is smooth.
This facilitates the transition of the nozzle into contact with the surface of the workpiece, improving the operability of the torch. Furthermore, a space portion of an appropriate shape may be provided inside the electrode 1 and the nozzle 3 to cool each of the electrodes 1 and the nozzle 3.
A cooling mechanism can be provided externally. Of course,
In the above, an inert or reducing gas can also be used as the working gas. in this case,
Suitable for welding work.
発明の効果
(A) 高融点の挿入体を除く電極の表面と導電性の
ノズルの内外面とにNi又はCrのいずれかを含む
電気メツキ層が配設されているため、
(イ) プラズマ放電は、電極の先端部に設けられ
た高融点の挿入体と被加工物との間にのみ確実に
発生される。Effects of the invention (A) Electroplated layers containing either Ni or Cr are provided on the surface of the electrode excluding the high melting point insert and on the inner and outer surfaces of the conductive nozzle, (a) Plasma discharge. is generated reliably only between the high melting point insert provided at the tip of the electrode and the workpiece.
即ち、従来生起していたダブルアークは皆無と
なり、トーチ各部を損傷する虞れはない。 In other words, there is no double arc that occurs in the past, and there is no risk of damaging the various parts of the torch.
(ロ) 酸化性ガスを用いても電極およびノズルが
容易に酸化されることはなく、従つて安価な酸化
性ガスを用いて、しかもトーチを高寿命に使用す
ることができる。 (b) Even when an oxidizing gas is used, the electrode and nozzle are not easily oxidized, and therefore, the torch can be used for a long time even with the use of an inexpensive oxidizing gas.
(ハ) 特に、上記電気メツキ層が配設されたノズ
ルの外面が滑らかな状態となり、このためノズル
の外面にスパツタやドロスが付着することは殆ん
どない。 (c) In particular, the outer surface of the nozzle on which the electroplating layer is provided becomes smooth, and therefore spatter or dross hardly adheres to the outer surface of the nozzle.
第１図は本発明の対象とするプラズマアークト
ーチの先端要部を概略的に示す図である。
１……電極、２……高融点の挿入体、３……導
電性のノズル。
FIG. 1 is a diagram schematically showing the main part of the tip of a plasma arc torch, which is the object of the present invention. 1... Electrode, 2... High melting point insert, 3... Conductive nozzle.
Claims (1)
記電極の先端部を電気絶縁的にかつ同軸的に覆う
導電性のノズルと、少なくとも前記電極とノズル
との間に作動ガスを供給するための手段と、前記
電極および被加工物の間に電流を供給するための
手段とを備えたプラズマアークトーチにおいて、
前記挿入体を除く電極の表面および前記ノズルの
内外面にNi又はCrのいずれかを含む電気メツキ
層を配設してなるプラズマアークトーチ。1. An electrode having a high melting point insert at its tip, a conductive nozzle electrically insulating and coaxially covering the tip of the electrode, and supplying a working gas between at least the electrode and the nozzle. and means for supplying a current between the electrode and the workpiece, the plasma arc torch comprising:
A plasma arc torch comprising an electroplated layer containing either Ni or Cr on the surface of the electrode excluding the insert and on the inner and outer surfaces of the nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11507885A JPS61271800A (en) | 1985-05-27 | 1985-05-27 | Plasma arc torch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11507885A JPS61271800A (en) | 1985-05-27 | 1985-05-27 | Plasma arc torch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61271800A JPS61271800A (en) | 1986-12-02 |
| JPH0544797B2 true JPH0544797B2 (en) | 1993-07-07 |
Family
ID=14653632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11507885A Granted JPS61271800A (en) | 1985-05-27 | 1985-05-27 | Plasma arc torch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61271800A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62292276A (en) * | 1986-06-11 | 1987-12-18 | Origin Electric Co Ltd | Plasma torch |
| JPH0199783A (en) * | 1987-10-12 | 1989-04-18 | Daihen Corp | Plasma arc torch |
| JPH01166887A (en) * | 1987-12-24 | 1989-06-30 | Hitachi Seiko Ltd | Nozzle for plasma arc generating torch |
| JP2591371Y2 (en) * | 1993-02-24 | 1999-03-03 | 株式会社小松製作所 | Plasma arc torch |
| JP4756929B2 (en) * | 2005-06-22 | 2011-08-24 | 荏原環境プラント株式会社 | Plasma melting furnace |
| US7342197B2 (en) * | 2005-09-30 | 2008-03-11 | Phoenix Solutions Co. | Plasma torch with corrosive protected collimator |
-
1985
- 1985-05-27 JP JP11507885A patent/JPS61271800A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61271800A (en) | 1986-12-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |