JPH0347743Y2 - - Google Patents
Info
- Publication number
- JPH0347743Y2 JPH0347743Y2 JP1986043271U JP4327186U JPH0347743Y2 JP H0347743 Y2 JPH0347743 Y2 JP H0347743Y2 JP 1986043271 U JP1986043271 U JP 1986043271U JP 4327186 U JP4327186 U JP 4327186U JP H0347743 Y2 JPH0347743 Y2 JP H0347743Y2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- tip
- arc
- insert
- 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.)
- Expired
Links
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 15
- 238000003754 machining Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001590 oxidative effect Effects 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
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 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
- 238000010891 electric arc 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
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Arc Welding In General (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、プラズマアークにより被加工物を加
工するための、特に小電流用の加工用トーチに用
いられるプラズマ電極に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a plasma electrode used in a processing torch for processing a workpiece using a plasma arc, particularly for a small current.
一般に、プラズマアークトーチにおいては、被
加工物又はノズル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。
Generally, in a plasma arc torch, arc discharge is generated between a workpiece or a nozzle and an electrode, and processing is performed using a plasma jet in which an appropriate working gas is injected from the 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.
従来、この種のトーチにおいては、酸化性のガ
スによる電極の消耗量を抑えて電極を高寿命に使
用するために、電極本体の先端部に高融点の挿入
体を保持させた電極が用いられていた。 Conventionally, in this type of torch, an electrode with a high melting point insert held at the tip of the electrode body has been used in order to suppress the amount of electrode wear caused by oxidizing gas and to extend the life of the electrode. was.
ところで、第５図に示されるごとく、電極３′
と被加工物５又はノズル４との間に発生されるア
ークに着目した場合、電極側のアーク発生点、即
ち陰極点“イ”は電極３′の下端および側面部分
“Ａ”に不安定な、いわゆるふらついた状態で生
起する。 By the way, as shown in FIG.
When focusing on the arc generated between the electrode 3' and the workpiece 5 or the nozzle 4, the arc generation point on the electrode side, that is, the cathode point "A" is located at the lower end and side surface part "A" of the electrode 3'. , which occurs in a so-called unsteady state.
この場合、加工用電流が30A程度以上の比較的
大きい場合には、生成するアーク力が大きいた
め、作動ガスによりアークを絞つて、電極の下端
部、例えば側面部に生成した陰極点が電極の略中
央部“ロ”に位置するように移行させた状態で、
ノズルの貫通孔よりプラズマジエツトを噴射させ
て加工を行なうことができる。 In this case, when the machining current is relatively large, such as about 30A or more, the generated arc force is large, so the arc is constricted by the working gas, and the cathode spot generated at the lower end of the electrode, such as the side surface, is With it moved so that it is located approximately in the center "b",
Processing can be performed by injecting a plasma jet from the through hole of the nozzle.
しかし、加工用電流が小さい場合、例えば15A
程度以下のときには、生成するアーク力が小さい
ため、例えば、電極３′の下部側面に生成した陰
極点“イ”を電極の略中央部“ロ”に移行させよ
うとして作動ガスを供給すると、陰極点が所望の
位置に移行する前にアークが消失してしまうこと
が多々あつた。このようにアークが消失した場合
は、当然プラズマアーク加工を行なうことができ
ないので、再度プラズマアークのスタート作業を
行なわなければならず、加工作業が非能率的であ
つた。
However, if the machining current is small, for example 15A
For example, if working gas is supplied in an attempt to move the cathode spot "A" generated on the lower side surface of the electrode 3' to the approximately central part "B" of the electrode, the arc force generated is small. The arc often disappeared before the point moved to the desired position. When the arc disappears in this way, plasma arc machining cannot be performed as a matter of course, and the plasma arc must be restarted, making the machining process inefficient.
本考案は、上記従来の問題点に着目してなされ
たもので、プラズマアーク加工用トーチに用いら
れるプラズマ電極において、電極本体の先端中央
部に高融点の挿入体を保持し、該挿入体および電
極本体の夫々の先端前面部の少なくとも一方に直
線状の溝を配設することにより上記問題点を解決
している。
The present invention was devised by focusing on the above-mentioned conventional problems.In a plasma electrode used in a torch for plasma arc processing, an insert with a high melting point is held at the center of the tip of the electrode body, and the insert and the The above problem is solved by providing a linear groove in at least one of the front surfaces of each of the electrode bodies.
電極本体の先端中央部に高融点の挿入体を保持
し、該挿入体および電極本体の夫々の先端前面部
の少なくとも一方に直線状の溝が配設されている
ため、陰極点がこの溝のエツジ部に発生し、かつ
作動ガスの供給に伴なつて陰極点はこの溝のエツ
ジ部を伝つて電極の略中央部に移行して、プラズ
マジエツトが確実に生成される。
An insert with a high melting point is held at the center of the tip of the electrode body, and a linear groove is provided in at least one of the insert and the front surface of the tip of the electrode body, so that the cathode spot is located in the groove. The cathode spot is generated at the edge portion, and as the working gas is supplied, the cathode spot moves along the edge portion of the groove to approximately the center of the electrode, thereby reliably generating a plasma jet.
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は電極本体で、例え
ば、銅又は銅合金により形成されている。２は電
極本体の先端中央部に保持さ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。
この電極本体１および挿入体２によりプラズマ電
極３が構成されている。このプラズマ電極３に
は、先端前面部に直線をなす溝３０１が配設され
ている。図示の場合、溝３０１は交叉して電極本
体１および挿入体２の夫々の先端前面部に配設さ
れてい。４はノズルで、例えば銅又は銅合金によ
り形成されている。
FIG. 1 is a diagram schematically showing the main part of the tip of a plasma arc torch, and 1 is an electrode main body, which is made of copper or a copper alloy, for example. Reference numeral 2 denotes a high melting point insert held at the center of the tip of the electrode body, and is made of, for example, hafnium, zirconium, or an alloy based on these.
The electrode body 1 and the insert 2 constitute a plasma electrode 3. This plasma electrode 3 is provided with a straight groove 301 on the front surface of its tip. In the illustrated case, the grooves 301 are disposed in an intersecting manner on the front surfaces of the distal ends of the electrode body 1 and the insert body 2, respectively. A nozzle 4 is made of copper or a copper alloy, for example.
上記構成において、例えば電極３とノズル４と
の間に通電して、いわゆるパイロツトアークを発
生させると共に、電極３の周囲に適宜の作動ガス
を供給して、ノズル４の貫通孔４０１からプラズ
マジエツトを噴出させる。この場合、電流の収剣
効果により、パイロツトアークの発生点、即ち陰
極点は溝３０１のエツジ部に生成する。また作動
ガスの供給に伴なつて陰極点はこの溝３０１のエ
ツジ部を伝つて電極３の略中央部“ロ”に容易に
移行する。この後、プラズマジエツトが生成され
る。 In the above configuration, for example, current is passed between the electrode 3 and the nozzle 4 to generate a so-called pilot arc, and an appropriate working gas is supplied around the electrode 3 to emit a plasma jet from the through hole 401 of the nozzle 4. erupt. In this case, a pilot arc generation point, ie, a cathode point, is generated at the edge of the groove 301 due to the current convergence effect. In addition, as the working gas is supplied, the cathode spot easily moves along the edge portion of the groove 301 to the approximately central portion "R" of the electrode 3. After this, a plasma jet is generated.
なお、プラズマジエツトを生成させる場合、電
極３とノズル４又は電極３と被加工物５のいずれ
かに適宜に給電させる。勿論、電極３と被加工物
５との間に給電してアークの発生→プラズマジエ
ツトの生成を行なうこともできる。 Note that when generating a plasma jet, power is supplied to either the electrode 3 and the nozzle 4 or the electrode 3 and the workpiece 5 as appropriate. Of course, it is also possible to supply electric power between the electrode 3 and the workpiece 5 to generate an arc and then generate a plasma jet.
また、第２図に示されるごとく、電極３の先端
部に配設される溝３０１が交叉していれば、アー
クの発生後、作動ガスの供給に伴なつて瞬間に陰
極点が交叉するエツジ部“ロ”に移行した状態で
安定化する。このため、溝３０１の交叉位置を挿
入体２の略軸芯部とすれば極めて有利である。 Furthermore, as shown in FIG. 2, if the grooves 301 disposed at the tips of the electrodes 3 intersect, the edges where the cathode points intersect instantaneously as the working gas is supplied after the arc is generated. It is stabilized in the state of transition to part “B”. For this reason, it is extremely advantageous if the intersecting position of the grooves 301 is located approximately at the axial center of the insert body 2.
第３図および第４図は、夫々本考案の他の実施
例を示す図であつて、第３図に示されるものにお
いては、電極３の挿入体２の先端前面部に直線状
の溝３０１が配設されている。また、第４図に示
されるものにおいては、電極本体１の先端前面部
に直線状の溝３０１が配設されている。なお、電
極３の先端部に配設される溝３０１の形状は、Ｖ
形、Ｕ状あるいは凹状など適宜の形状とすること
ができる。また溝３０１の条数は１以上であれば
よく、例えば、交叉する３以上の溝とすることが
できる。 3 and 4 are views showing other embodiments of the present invention, respectively. In the one shown in FIG. is installed. Furthermore, in the one shown in FIG. 4, a linear groove 301 is provided in the front surface of the tip of the electrode body 1. Note that the shape of the groove 301 provided at the tip of the electrode 3 is V
It can be formed into an appropriate shape such as a U-shape, a concave shape, or the like. Further, the number of grooves 301 may be one or more, and for example, three or more intersecting grooves may be used.
電極本体の先端中央部に高融点の挿入体を保持
し、該挿入体および電極本体の夫々の先端前面部
の少なくとも一方に直線状の溝が配設されている
ため、陰極点がこの溝のエツジ部に発生し、かつ
作動ガスの供給に伴なつて陰極点はこの溝のエツ
ジ部を伝つて電極の略中央部に移行して、プラズ
マジエツトが確実に生成される。
An insert with a high melting point is held at the center of the tip of the electrode body, and a linear groove is provided in at least one of the insert and the front surface of the tip of the electrode body, so that the cathode spot is located in the groove. The cathode spot is generated at the edge portion, and as the working gas is supplied, the cathode spot moves along the edge portion of the groove to approximately the center of the electrode, thereby reliably generating a plasma jet.
即ち、加工用電流が小さい場合でも、アークを
消失することなくプラズマジエツトを確実に生成
することができるので、加工作業を確実に能率よ
く行なうことができる。 That is, even when the machining current is small, a plasma jet can be reliably generated without quenching the arc, so that the machining work can be performed reliably and efficiently.
第１図は、本考案の実施例を示す縦断面図、第
２図は第１図の要部斜視図、第３図ａおよび第４
図ａは夫々本考案の他の実施例を示す図であつ
て、夫々第２図に相当する図、第３図ｂおよび第
４図ｂは夫々第３図ａおよび第４図ａの縦断面を
示す図、第５図は従来例を示す図である。
１……電極本体、２……挿入体、３……電極、
３０１……溝。
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view of the main part of FIG. 1, and FIGS.
Figure a is a diagram showing another embodiment of the present invention, and corresponds to Figure 2, and Figures 3b and 4b are longitudinal sections of Figures 3a and 4a, respectively. FIG. 5 is a diagram showing a conventional example. 1... Electrode body, 2... Insertion body, 3... Electrode,
301...groove.
Claims (1)
ラズマ電極において、電極本体の先端中央部に
高融点の挿入体を保持し、該挿入体および電極
本体の夫々の先端前面部の少なくとも一方に直
線状の溝を配設してなるプラズマ電極。 ２ 前記溝は、少なくとも挿入体の先端前面部に
交叉して配設されてなる実用新案登録請求の範
囲第１項記載のプラズマ電極。[Claims for Utility Model Registration] 1. In a plasma electrode used in a torch for plasma arc processing, an insert with a high melting point is held at the center of the tip of the electrode body, and the insert and the front surface of each tip of the electrode body are A plasma electrode that has a linear groove on at least one side. 2. The plasma electrode according to claim 1, wherein the groove is disposed to cross at least the front surface of the tip of the insert.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986043271U JPH0347743Y2 (en) | 1986-03-24 | 1986-03-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986043271U JPH0347743Y2 (en) | 1986-03-24 | 1986-03-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62155969U JPS62155969U (en) | 1987-10-03 |
| JPH0347743Y2 true JPH0347743Y2 (en) | 1991-10-11 |
Family
ID=30859972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986043271U Expired JPH0347743Y2 (en) | 1986-03-24 | 1986-03-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0347743Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006158501A (en) * | 2004-12-03 | 2006-06-22 | Okamura Corp | Panel apparatus having photocatalyst surface |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5647884B2 (en) * | 2010-12-21 | 2015-01-07 | 日酸Ｔａｎａｋａ株式会社 | Plasma torch electrode and plasma torch |
| JP5805409B2 (en) * | 2011-03-17 | 2015-11-04 | 株式会社小松製作所 | Electrode for plasma cutting device and plasma torch |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49111825A (en) * | 1973-02-28 | 1974-10-24 | ||
| JPS49111852A (en) * | 1973-02-05 | 1974-10-24 |
-
1986
- 1986-03-24 JP JP1986043271U patent/JPH0347743Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49111852A (en) * | 1973-02-05 | 1974-10-24 | ||
| JPS49111825A (en) * | 1973-02-28 | 1974-10-24 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006158501A (en) * | 2004-12-03 | 2006-06-22 | Okamura Corp | Panel apparatus having photocatalyst surface |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62155969U (en) | 1987-10-03 |
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