JPS61216861A - Plasma arc cutting device - Google Patents
Plasma arc cutting deviceInfo
- Publication number
- JPS61216861A JPS61216861A JP5689785A JP5689785A JPS61216861A JP S61216861 A JPS61216861 A JP S61216861A JP 5689785 A JP5689785 A JP 5689785A JP 5689785 A JP5689785 A JP 5689785A JP S61216861 A JPS61216861 A JP S61216861A
- Authority
- JP
- Japan
- Prior art keywords
- contact
- plasma
- nozzle
- cut
- arc
- 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.)
- Granted
Links
Landscapes
- Arc Welding In General (AREA)
- Arc Welding Control (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、１つの直流電源装置を共用して接触、非接触
切断方式によるプラズマ切断を選択的に行うよ−うにし
たプラズマアーク切断装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a plasma arc cutting device that selectively performs plasma cutting using a contact or non-contact cutting method by sharing one DC power supply.
従来の技術
従来のプラズマアーク切断装置としては、電極と被切断
材との間にプラズマアークを飛ばして被切断材を切断す
る移行式（トランスファ式）、電極とノズルとの間に飛
ばしたプラズマアークを作動ガスの噴射圧によって被切
断材側に噴射させて被切断材を切断する非移行式（ノン
トランスファ式）があるが、今日では、移行式の改良と
して、新たにプラズマトーチを被切断材に接触させて起
動させる方式も開発されており、接触方式と呼ばれてい
る。Conventional technology Conventional plasma arc cutting devices include the transfer type, which cuts the material by sending a plasma arc between an electrode and the material to be cut, and the transfer type, which cuts the material by sending a plasma arc between the electrode and the nozzle. There is a non-transfer type (non-transfer type) that cuts the material by injecting it toward the material to be cut using the injection pressure of working gas, but today, as an improvement on the transfer type, a new plasma torch is being used to cut the material. A method has also been developed that activates the device by touching it, and is called the contact method.
発明が解決しようとする問題点
本発明は、移行式のプラズマアーク切断装置の改良に係
るもので、その解決しようとする技術的課題は、プラズ
マトーチを被切断材に接触して起動させる接触式、プラ
ズマトーチを被切断材より浮かせた状態に保持して起動
させる非接触式の２つの切断方式を１つの直流電源を共
用して行い得えるようにすることにある。Problems to be Solved by the Invention The present invention relates to the improvement of a transition type plasma arc cutting device. The object of the present invention is to enable two non-contact cutting methods in which a plasma torch is held in a state above a material to be cut and activated to be started by using one DC power source in common.
問題点を解決するための手段
本発明では、上記した技術的課題は以下の手段によって
解決される。Means for Solving the Problems In the present invention, the above-mentioned technical problems are solved by the following means.
１）直流電源装置を垂下特性を含む定電流特性を有した
ものに構成すること、
２）直流電源装置の被切断材側出力端子とノズルとの間
に、電流制限抵抗を接続した接点手段を設けて、この接
点手段の切り換え開閉操作により、電極とノズル間に電
圧を印加し得るパイロットアーク発生用電路を形成でき
るように構成すること、発明の作用及び効果
本発明装置によれば、接点手段の接点を閉じてパイロッ
トアーク発生用電路が形成された時には、電極とノズル
との間に電圧が印加できるので、電極とノズルとの間に
パイロットアークを飛ばせて起動でき、更にプラズマト
ーチを被切断材に接近させて被切断材にアークを移行さ
せて、プラズマトーチを被切断材より浮かせた状態に維
持して被切断材を切断できる。1) Configuring the DC power supply to have constant current characteristics including drooping characteristics; 2) Connecting a contact means with a current limiting resistor connected between the output terminal of the DC power supply on the side of the material to be cut and the nozzle. According to the apparatus of the present invention, the contact means is configured such that a pilot arc generating electric path that can apply voltage between the electrode and the nozzle can be formed by switching and opening/closing the contact means. When the pilot arc generation circuit is formed by closing the contacts, voltage can be applied between the electrode and the nozzle, so a pilot arc can be flown between the electrode and the nozzle to start the plasma torch, and the plasma torch can be cut off. The material to be cut can be cut by bringing the plasma torch close to the material and transferring the arc to the material to be cut, and maintaining the plasma torch above the material to be cut.
また、接点手段の接点を開いてパイロットアーク発生用
電路が開かれた時には、プラズマトーチを被切断材に接
触させ、電極と被切断材間に直接アークプラズマを飛ば
せて起動できるので、そのままプラズマトーチを被切断
材に接触保持して被切断材を切断できる。In addition, when the pilot arc generating circuit is opened by opening the contact of the contact means, the plasma torch can be brought into contact with the material to be cut and the arc plasma can be directly ejected between the electrode and the material to be cut. The material to be cut can be cut by keeping it in contact with the material.
したがって、本発明装置によれば、接点手段の切り換え
開閉操作により１つの直流電源を共用して、接触、非接
触方式のプラズマ切断が可能となるので、被切断材に応
じて最適な方式が選択でき、それぞれの利点を活かした
切断方式が可能となる。Therefore, according to the device of the present invention, it is possible to perform contact and non-contact plasma cutting by sharing one DC power source by switching and opening/closing the contact means, so the optimal method can be selected depending on the material to be cut. This enables a cutting method that takes advantage of the advantages of each.
発明の実施例
以下に、添付図を参照しながら本発明装置の一実施例を
説明する。Embodiment of the Invention An embodiment of the apparatus of the present invention will be described below with reference to the accompanying drawings.
第１図は、本発明装置の概略構成を示す系統図である。FIG. 1 is a system diagram showing a schematic configuration of the apparatus of the present invention.
図において、Ｔはプラズマトーチ、１は電極、２はプラ
ズマアークを拘束するためのノズル、３は定電流あるい
は垂下特性を有した直流電源装置、４は切断作業時に発
生するプラズマアーク、５は被切断材、６はプラズマア
ークの起動時に重畳させる高周波電流を発生する高周波
発生装置、９はンールドカノプ、１４ａ、１４ｂは直流
電源装置３の電源電圧を供給するための接続ケーブルで
あり、１４ａは被切断材５に通じ、１４ｂは電極１に通
じている。In the figure, T is a plasma torch, 1 is an electrode, 2 is a nozzle for restraining the plasma arc, 3 is a DC power supply device with constant current or drooping characteristics, 4 is a plasma arc generated during cutting work, and 5 is an exposed object. 6 is a high-frequency generator that generates a high-frequency current to be superimposed upon startup of the plasma arc; 9 is a rolled canopy; 14a and 14b are connecting cables for supplying the power supply voltage of the DC power supply device 3; 14a is the material to be cut; 14b communicates with the electrode 1.
一方、７はパイロットアーク発生用電路を形成するため
に設けた接点手段であり、この接点手段７にはパイロッ
トアーク発生時に電路に流れる電流を抑制するため電流
制限抵抗８が直列に接続されている。On the other hand, 7 is a contact means provided to form an electric path for generating a pilot arc, and a current limiting resistor 8 is connected in series to this contact means 7 in order to suppress the current flowing through the electric path when a pilot arc is generated. .
本発明装置においては、直流電源装置３としては垂下特
性を含む定電流特性を有したものがアークを安定に維持
するため採用されるが、高周波インバータなどで構成す
ると、小型で軽量化が図れる。In the device of the present invention, a DC power supply device 3 having constant current characteristics including drooping characteristics is used to maintain the arc stably, but if it is configured with a high frequency inverter etc., it can be made smaller and lighter.
また、本発明装置は、作動ガスによる熱的ピンチ効果を
利用して電極と被切断材間に発生させたプラズマアーク
（高温プラズマ流）を拘束し、このアークプラズマを溶
断熱源に用いて被切断材を切断するものであり、作動ガ
スとしては通常の圧縮エアーが使用できる。In addition, the device of the present invention utilizes the thermal pinch effect of the working gas to restrain the plasma arc (high-temperature plasma flow) generated between the electrode and the workpiece, and uses this arc plasma as a heat source to cut the workpiece. It is used to cut materials, and normal compressed air can be used as the working gas.
第２図は、本発明装置の構成をより具体的に示す回路図
である。FIG. 2 is a circuit diagram showing more specifically the configuration of the device of the present invention.
図においては、第１図に対応する部分に同一の符号をも
って示しである。In the figure, parts corresponding to those in FIG. 1 are designated by the same reference numerals.
直流電源装置３は、インバータ駆動部を省略して示して
あり、変圧器の２次側にダイオードブッリジを設けて発
生した出力を全波整流している。The DC power supply device 3 is shown with an inverter drive section omitted, and a diode bridge is provided on the secondary side of the transformer to full-wave rectify the output generated.
また、１３は直流リアクトル、１０は電流検出手段であ
り、プラズマアーク発生時に生じる切断電流を検出して
高周波発生装置６の作動を停止する信号を出力すると共
に、プラズマアーク４が生じた後は主回路に流れる電流
を電圧信号に変換して直流電源の出力を定電流制御する
ためのフィードバック制御信号を出力している。Further, 13 is a DC reactor, and 10 is a current detection means, which detects the cutting current generated when a plasma arc is generated and outputs a signal to stop the operation of the high frequency generator 6. It converts the current flowing through the circuit into a voltage signal and outputs a feedback control signal for constant current control of the output of the DC power supply.
８は接点手段７に直列に接続した電流制限抵抗であり、
抵抗素子とコンデンサより成る回路工１はプラズマアー
クの起動時における直流リアクトル１３による電流の立
ち上がりの遅れを補償するための補償回路である。8 is a current limiting resistor connected in series to the contact means 7;
A circuit 1 consisting of a resistive element and a capacitor is a compensation circuit for compensating for a delay in the rise of the current due to the DC reactor 13 at the time of starting the plasma arc.
第２図の実施例回路では、ノズル２と電極１間及び、被
切断材５と電極１間にバイパスコンデンサ１２・・・を
設けているが、このようなバイパスコンデンサを設ける
と、パイロットアーク発生用電路形成時には、パイロッ
トアーク電路内に設けた電流制限抵抗をバイパスして、
アークの起動を容易にする一方、パイロットアーク発生
用電路が形成されない時には、接点手段７に加わる高周
波電圧をバイパスして接点の保護を図る他、機器の誤動
作を防止するために有益である。In the example circuit shown in Fig. 2, a bypass capacitor 12 is provided between the nozzle 2 and the electrode 1 and between the material to be cut 5 and the electrode 1. However, if such a bypass capacitor is provided, pilot arc generation may occur. When forming the electrical circuit, the current limiting resistor installed in the pilot arc circuit is bypassed.
While facilitating the starting of the arc, when the pilot arc generation circuit is not formed, the high frequency voltage applied to the contact means 7 is bypassed to protect the contact and is useful for preventing equipment malfunction.
次に本発明装置の操作手順と動作について説明する。Next, the operating procedure and operation of the device of the present invention will be explained.
本発明装置においては、接点手段７の接点を閉じれば、
パイロットアーク発生用電路が形成され電極１とノズル
２間に電圧が印加されるので、高周波発生装置６を駆動
して、電極１とノズル２間に高周波放電を先導させてパ
イロットアークを発生させる。In the device of the present invention, if the contact of the contact means 7 is closed,
Since a pilot arc generating electric path is formed and a voltage is applied between the electrode 1 and the nozzle 2, the high frequency generator 6 is driven to lead a high frequency discharge between the electrode 1 and the nozzle 2 to generate a pilot arc.
パイロットアークが生じた後は、プラズマトーチＴを被
切断材５に接近させ、生じたアークをノズル２から被切
断材５側に移行させて、プラズマアーク４を発生させ、
その後はプラズマトーチＴを被切断材５の上面に浮かせ
た状態に保持しながら、被切断材５を任意の形状に切断
する。After the pilot arc is generated, the plasma torch T is brought close to the material to be cut 5, the generated arc is transferred from the nozzle 2 to the material to be cut 5, and the plasma arc 4 is generated.
Thereafter, the material to be cut 5 is cut into an arbitrary shape while the plasma torch T is kept floating above the material to be cut 5 .
また、接点手段７の接点を開けば、電極１とノズル２と
の間には電圧が印加されず、パイロ７トアーク発生用電
路は形成されないので、プラズマトーチＴを被切断材５
に接触させてから、高周波発生装置６を駆動して、電極
１と被切断材５との間に高周波放電を先導させて直接プ
ラズマアーク４を発生させて、トーチＴを移動させなが
ら被切断材５を切断する。Furthermore, when the contact of the contact means 7 is opened, no voltage is applied between the electrode 1 and the nozzle 2, and no electric path for generating a pyro 7 arc is formed.
After bringing the torch T into contact with the workpiece, the high-frequency generator 6 is driven to lead a high-frequency discharge between the electrode 1 and the workpiece 5 to generate a plasma arc 4 directly, and the workpiece is moved while the torch T is moved. Cut 5.
上記のいずれの方式を採用する場合も、高周波発生装置
６は、高周波障害の発生を防止するためアークプラズマ
５が発生し安定化した時点でその駆動を停止することが
望ましい。When any of the above methods is adopted, it is desirable that the high frequency generator 6 stops driving when the arc plasma 5 is generated and stabilized, in order to prevent the occurrence of high frequency disturbances.
第１図は、本発明装置の概略構成を示す系統図、第２図
はその具体的構成を示す回路図を示している。
（符号の説明）
図において、Ｔはプラズマトーチ、１は電極、２はノズ
ル、３は直流電源装置、４はプラズマア接点手段、８は
電流制限抵抗、１２はバイパスコンデンサ、１４ａ、１
４ｂは接続ケーブルを示す。FIG. 1 is a system diagram showing a schematic structure of the apparatus of the present invention, and FIG. 2 is a circuit diagram showing its specific structure. (Explanation of symbols) In the figure, T is a plasma torch, 1 is an electrode, 2 is a nozzle, 3 is a DC power supply, 4 is a plasma contact means, 8 is a current limiting resistor, 12 is a bypass capacitor, 14a, 1
4b shows a connection cable.
Claims (4)
を用いたプラズマアーク切断装置において、直流電源装
置の被切断材側出力端子とノズルとの間に、電流制限抵
抗を接続した接点手段を設けて成り、この接点手段の切
り換え開閉操作により、電極とノズル間に電圧を印加し
得るパイロットアーク発生用電路を形成できるように構
成して、上記直流電源装置を共用して接触切断方式、非
接触切断方式の両方式による切断を可能にしたことを特
徴とするプラズマアーク切断装置。(1) In a plasma arc cutting device using a DC power supply having constant current characteristics including drooping characteristics, a contact means having a current limiting resistor connected between the output terminal of the DC power supply on the side of the material to be cut and the nozzle. The contact cutting method is configured such that a pilot arc generation circuit can be formed by applying a voltage between the electrode and the nozzle by switching and opening/closing the contact means, and the DC power supply unit is shared by the contact cutting method. A plasma arc cutting device characterized by being capable of cutting using both non-contact cutting methods.
に、高周波電流をバイパスさせるバイパスコンデンサを
更に設けたことを特徴とする特許請求の範囲第（１）項
に記載のプラズマアーク切断装置。(2) The plasma according to claim (1), further comprising a bypass capacitor for bypassing high-frequency current between the nozzle and the material to be cut, and between the material to be cut and the electrode. Arc cutting device.
されたものである特許請求の範囲第（１）項又は第（２
）項に記載のプラズマアーク切断装置。(3) Claim (1) or (2) in which the DC power supply device is constituted by a high frequency inverter.
) The plasma arc cutting device described in item 1.
（１）項又は第（２）項又は第（３）項に記載のプラズ
マアーク切断装置。(4) The plasma arc cutting device according to claim (1), (2), or (3), wherein the working gas is compressed air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60056897A JPH0636991B2 (en) | 1985-03-20 | 1985-03-20 | Plasma arc cutting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60056897A JPH0636991B2 (en) | 1985-03-20 | 1985-03-20 | Plasma arc cutting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61216861A true JPS61216861A (en) | 1986-09-26 |
| JPH0636991B2 JPH0636991B2 (en) | 1994-05-18 |
Family
ID=13040234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60056897A Expired - Fee Related JPH0636991B2 (en) | 1985-03-20 | 1985-03-20 | Plasma arc cutting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0636991B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01245972A (en) * | 1988-03-28 | 1989-10-02 | Fuji Electric Co Ltd | Portable air plasma cutting machine |
| JPH03142076A (en) * | 1989-10-26 | 1991-06-17 | Matsushita Electric Ind Co Ltd | Plasma arc machine |
| WO1997002919A1 (en) * | 1995-07-12 | 1997-01-30 | Komatsu Ltd. | Plasma torch |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5851791A (en) * | 1981-09-19 | 1983-03-26 | Victor Co Of Japan Ltd | Dc brushless motor |
-
1985
- 1985-03-20 JP JP60056897A patent/JPH0636991B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5851791A (en) * | 1981-09-19 | 1983-03-26 | Victor Co Of Japan Ltd | Dc brushless motor |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01245972A (en) * | 1988-03-28 | 1989-10-02 | Fuji Electric Co Ltd | Portable air plasma cutting machine |
| JPH0638985B2 (en) * | 1988-03-28 | 1994-05-25 | 富士電機株式会社 | Portable air plasma cutting machine |
| JPH03142076A (en) * | 1989-10-26 | 1991-06-17 | Matsushita Electric Ind Co Ltd | Plasma arc machine |
| WO1997002919A1 (en) * | 1995-07-12 | 1997-01-30 | Komatsu Ltd. | Plasma torch |
| US5925267A (en) * | 1995-07-12 | 1999-07-20 | Komatsu Ltd. | Plasma torch having a bypass unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0636991B2 (en) | 1994-05-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |