JPS6085826A - Power source for electric-discharge machining - Google Patents
Power source for electric-discharge machiningInfo
- Publication number
- JPS6085826A JPS6085826A JP19047083A JP19047083A JPS6085826A JP S6085826 A JPS6085826 A JP S6085826A JP 19047083 A JP19047083 A JP 19047083A JP 19047083 A JP19047083 A JP 19047083A JP S6085826 A JPS6085826 A JP S6085826A
- Authority
- JP
- Japan
- Prior art keywords
- power source
- machining
- voltage
- electric
- current
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
- B23H1/022—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges for shaping the discharge pulse train
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、加工液として導電性加工液を用いる放電加
工用電源に関するものである、〔従来技術〕
従来この種の装置としては第１図に示すものがあつｔこ
、図において、 （１）は直流電源、（２）はパワート
ランジスタ、（３）は発振器、（４）は加工電流を制御
する可変抵抗、（５）は電極および被加工物で形成され
る極間である、一般の放電加工では加工液として鉱油、
ケロシン等の絶縁液を用いるため、極間に印加される電
圧は無負荷時にはＥｏの値を示し、加工時の電圧、電流
波形はそれぞれ第２図（ａ）（ｂ）の電圧波形（６バ７
）および電流波形（８）のようになる。[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a power source for electrical discharge machining that uses a conductive machining fluid as a machining fluid. In the figure, (1) is a DC power supply, (2) is a power transistor, (3) is an oscillator, (4) is a variable resistor that controls the machining current, and (5) is the electrode and workpiece. In general electric discharge machining, which is a gap formed by materials, mineral oil,
Since an insulating liquid such as kerosene is used, the voltage applied between the electrodes shows the value of Eo when there is no load, and the voltage and current waveforms during machining are the voltage waveforms (6 bars) shown in Figures 2 (a) and (b). 7
) and the current waveform (8).
しかしながら、水や水と有機化合物を混合した加工液を
用いる場合には、加工液が導電性であるため、電極間の
インピーダンスは、電極と液加１物間の距離を（ｇ）、
電極と被加工物間の対同面積を（Ｓ）、加工液の比抵抗
を（ρ）とすると、第８図に示すように、
Ｒ−ρ・−・・・・・・・・・・・（υとなり、極間が
せまい程、又、対同面積か大きい程インピータンスは低
下する、従って、この場合の極間波形は第４図に示すよ
うになり、極間電圧印加時には極間インピーダンスの低
下により、オームの法則に基づく電流が流れ無効電流（
２）となり、極間への印加電圧（２）は低下するーその
後で放電が開始すると主任はアーク重任（７）に、加工
電流は（８）に移行する、しかし、さらに加工面積が増
加すると第５図に示すように印加電圧が上昇せず電圧波
形ＱＱ程度にし７カ・ならないため、放電か発生せず、
無効電流θΦが増大し、最終的には放電が不可能となる
１こめ、大加工面積の加工では、加工液の比抵抗をイオ
ン交換樹脂等で上昇させる必要がある、そのためケロシ
ン等と比較し１６価になる欠点かあった。However, when using water or a machining fluid that is a mixture of water and an organic compound, the impedance between the electrodes is determined by the distance between the electrode and the liquid (g), since the machining fluid is conductive.
Assuming that the area between the electrode and the workpiece is (S) and the specific resistance of the machining fluid is (ρ), as shown in Figure 8, R-ρ.・(υ), and the narrower the gap is, or the larger the area is, the lower the impedance is. Therefore, the waveform between the electrodes in this case is as shown in Figure 4, and when the voltage is applied, the impedance decreases. Due to the decrease in impedance, a current based on Ohm's law flows and reactive current (
2), and the voltage applied to the machining gap (2) decreases.After that, when the discharge starts, the supervisor shifts to arc duty (7) and the machining current shifts to (8).However, if the machining area increases further, As shown in Fig. 5, the applied voltage does not rise and the voltage waveform becomes approximately QQ, so no discharge occurs.
In machining large machining areas, where the reactive current θΦ increases and eventually discharging becomes impossible, it is necessary to increase the specific resistance of the machining fluid using ion exchange resin, etc. Therefore, compared to kerosene, etc. It had the disadvantage of being 16 valent.
本発明は上記のよ：ｌな従内の放電加工用電源の欠点を
除去するためになされｆコもので、極間インピータンス
より低い内部抵抗を有するパルス電源を用い、極間の短
絡の有無を確認して、極間に放電が発生するのに充分な
電圧を印加し、極間に放電が発生したことを検出してオ
フするとともに所定の加工電流波形を供給するパルス電
源をオンするとともに、所定時間の休止時間ののち、こ
の一連の動作を繰返す制御を行なう放電加工用電源を提
供するものである、
〔発明の実施例〕
以下、この発明の一実施例を図について説明する、
第６図において、αηは第１のパルス電源の直流ｍｓ、
ａ引よパワートランジスタ、 （ＩＩはこのパワートラ
ンジスタを駆動する第１駆動回路、翰はパワートランジ
スタＱａのエミ・ツタに接続された可変抵抗器であり、
極間インピータンスより小さな内部インピータンスに調
整するものである。Ｑ］）は＠ｌのパルス電源における
タイオード、（イ）は第２のパルス電源の直流電源、翰
はパワートランジスタ、（ハ）はこのパワートランジス
タを駆動する第２の駆動回路、（イ）は加工電流を制御
する可変抵抗器、（ホ）は第２のパルス電源におけるダ
イオ−Ｖ％に）は発振器を内蔵した切換制御装置、に）
は電極、（２）（至）は電極（ホ）間に放電が発生した
ことを検出する信号線、＠１）Ｃ３２１は第１．第２の
パワートランジスタ駆動回路への信号線、θ１は極間へ
流れる電流を検出する電流検出手段０１）と極間電圧を
検出する検出線０４．−によって検出される電流、電圧
によ−て極間の短絡を検出する短絡検出手段である、
次に第６図の構成の動作を第７図により説明する、
切換制御回路（ロ）は加ニスタート時に、第２パルス電
源かオンするようにセットされ、第７図に示す電圧波形
（ハ）および電源波形に）が極間に生ずる。The present invention was made in order to eliminate the drawbacks of the secondary power source for electric discharge machining as described above. After confirming that, sufficient voltage is applied to generate a discharge between the electrodes, and when it is detected that a discharge has occurred between the electrodes, it is turned off, and the pulse power supply that supplies a predetermined machining current waveform is turned on. The present invention provides a power source for electrical discharge machining that performs control to repeat this series of operations after a predetermined rest time. In Figure 6, αη is the DC ms of the first pulse power supply,
A is a power transistor, (II is a first drive circuit that drives this power transistor, and a wire is a variable resistor connected to the emitter and ivy of the power transistor Qa,
The internal impedance is adjusted to be smaller than the impedance between the electrodes. Q]) is the diode in the @l pulse power supply, (a) is the DC power supply of the second pulse power supply, the wire is the power transistor, (c) is the second drive circuit that drives this power transistor, and (a) is the (e) is a variable resistor that controls the machining current; (e) is a diode in the second pulse power supply;
is the electrode, (2) (to) is the signal line that detects the occurrence of discharge between the electrodes (e), and @1) C321 is the 1st. The signal line θ1 is a signal line to the second power transistor drive circuit, and the current detection means 01) for detecting the current flowing between the electrodes and the detection line 04.04 for detecting the voltage between the electrodes. The switching control circuit (b) is a short circuit detection means for detecting a short circuit between poles based on the current and voltage detected by -. At the time of the second start, the second pulse power supply is set to be turned on, and the voltage waveform (c) and power supply waveform shown in FIG. 7 are generated between the poles.
ここで短絡重圧検出レベルＨＬｖ＠より極間電圧が高く
かつ極間電流が電流検出レベル１Ｌｉ（至）より低い
場合は極間が正常であるとして短絡検出手段−から切換
制御回路（ロ）へは伺ら信号が伝達さ１１ず、所定時間
後に第１パルス電源がオンし、極間には放電が開始し得
る電圧鏝が発生し、その結果として電流（至）が生ずる
。次に放電が生じると、切換制御回路内の放電検出手段
が働き、第１のパルス電源をオフするとともに、第２の
１＜ルス電源を引き続き所定の時間オンすることにより
、加工電流を流した後所定時間の休止時ｌ′ｌｌ０Ｉを
設け、再び初期状態に戻し第２のパルス電源をオンさせ
る動作を繰返す。次に第２のパルス電源をオンさせた時
、加工常圧■が検出レベル；Ｌνより低く、加工電流Ｇ
１が検出レベル；Ｌｉより高い場合には極間が短絡状態
であるｆコめ、短絡検出手段（ＩＩ）ら切換制御回路へ
短絡信号が伝達され、第１の／ＮＩＬルス電源をオンす
ることなく第２のノでルス電源を所定時間オンしｆコ後
、所定時間の休止時間を設け、再び初期状態に戻し以後
上記動作を繰返すことで短絡時の第１電飾からの大電流
の印加がなくなり、電極消耗、加工安定性が著しく改善
される、〔発明の効果〕
以上のように、本発明によれば、極面状態が正常（短絡
でない）な場合にのみ小さな内部インピーダンスを有１
°る第１のパルス電源を用いる０）で、電極の消耗も少
なく、加１が安定な状態を維持しなか１・従来加工不可
能であ−・ｊコ大面積、仕上加工領域において加工が可
能になり、安価で実用的な放電加工用Ｔ源を得ることが
でき、極めて有効な効果を奏する、
なＪ、ｆ、本実施例では汎用放電加工域について述べｔ
コがワＡ＋カット放電加工域についても同様の効果を奏
する、Here, if the inter-electrode voltage is higher than the short-circuit heavy pressure detection level HLv@ and the inter-electrode current is lower than the current detection level 1Li (To), it is assumed that the inter-electrode is normal and the short-circuit detection means - to the switching control circuit (B) The first pulse power source is turned on after a predetermined time without transmitting the signal, and a voltage trowel that can start a discharge is generated between the poles, and as a result, a current is generated. Next, when a discharge occurs, the discharge detection means in the switching control circuit operates to turn off the first pulse power supply and continue to turn on the second pulse power supply for a predetermined period of time, thereby causing the machining current to flow. After that, a predetermined period of rest l'll0I is provided, and the operation of returning to the initial state again and turning on the second pulse power source is repeated. Next, when the second pulse power source is turned on, the machining normal pressure ■ is lower than the detection level Lν, and the machining current G
1 is the detection level; if it is higher than Li, there is a short circuit between the poles. A short circuit signal is transmitted from the short circuit detection means (II) to the switching control circuit, and the first /NIL pulse power supply is turned on. Instead, the power supply is turned on for a predetermined time at the second switch, after which a pause period is set for a predetermined time, the initial state is returned again, and the above operation is repeated thereafter, thereby applying a large current from the first illumination in the event of a short circuit. [Effects of the Invention] As described above, according to the present invention, the electrode has a small internal impedance only when the polar surface condition is normal (no short circuit).
0) Using the first pulsed power supply, which reduces electrode wear and maintains a stable state, machining is possible in large areas and finishing machining areas, which were conventionally impossible. This makes it possible to obtain an inexpensive and practical T-source for electrical discharge machining, which has an extremely effective effect.
The same effect is achieved for the A + cut electric discharge machining area.
第１図は従来の放電加工機用電源の回路図、第２図は第
１図の電源の電圧、電流波形図、第３図は導電性態１．
液を用いた場合の極間の宿成図、第４図、第５図は従来
例の電圧、Ｗ流波形図、第６図は本発明の一実施例を示
す回路図、第７図は第６図のものの極間電圧、電流波形
図である、図にオイいて、０りは直流電源、０引よパワ
ートラン・〉スタ、ＯｉＩは第１駆動回路、翰は直流電
源、翰はパワートランジスタ、＜２４は第２駆動回路、
（社）は切換加工用電源である。
代理人 大岩増雄
第 ／ 図
第２ 図
第３し１
第４図FIG. 1 is a circuit diagram of a conventional power source for an electric discharge machine, FIG. 2 is a voltage and current waveform diagram of the power source shown in FIG. 1, and FIG. 3 is a diagram of conductive state 1.
Figures 4 and 5 are voltage and W current waveform diagrams of the conventional example, Figure 6 is a circuit diagram showing an embodiment of the present invention, and Figure 7 is a diagram showing the formation diagram between the electrodes when a liquid is used. Figure 6 is a voltage and current waveform diagram between electrodes. In the figure, 0 is the DC power supply, 0 is the power transformer, OiI is the first drive circuit, the wire is the DC power supply, and the wire is the power supply. transistor, <24 is the second drive circuit,
(Company) is a power supply for switching processing. Agent Masuo Oiwa / Figure 2 Figure 3 Shi1 Figure 4
Claims (1)
対同面積、および導電性加工液の比抵抗によって定めら
れる電極間インピータンスよｌ）小さな内部インピーダ
ンスを有する第１のパルスｍ源と、所定の加工電流波形
を供給する第２のパルス電源と 極間短絡検出手段を具
備し、第２のパルス電源をオンし、該極間短絡検出手段
の応動に応じて上記第１のパルス電源をオンした後、上
記極間に放電が発生Ｌ ｒ：ことを検出する検出手段、
この検出手段の応動に応じて上記第１のパルス電源をオ
フし、上記第２のパルス電源により所定時間加工電流を
流し、さらに所定時間の休止時間を設ける動作を繰返し
制御する切換回路とを備えたことを特徴とする放電加工
用電源。The distance between the electrode and the workpiece, above w! is the same area between the pole and the workpiece, and the impedance between the electrodes determined by the specific resistance of the conductive machining fluid.l) A first pulse m source having a small internal impedance and supplying a predetermined machining current waveform. a second pulse power source for detecting a short circuit between electrodes, and a short circuit detection means for detecting a short circuit between electrodes; a detection means for detecting that a discharge occurs Lr:
and a switching circuit that repeatedly controls the operation of turning off the first pulse power source in response to the response of the detection means, causing the machining current to flow for a predetermined time using the second pulse power source, and further providing a rest time of a predetermined time. A power supply for electric discharge machining characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19047083A JPS6085826A (en) | 1983-10-12 | 1983-10-12 | Power source for electric-discharge machining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19047083A JPS6085826A (en) | 1983-10-12 | 1983-10-12 | Power source for electric-discharge machining |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6085826A true JPS6085826A (en) | 1985-05-15 |
| JPH0151293B2 JPH0151293B2 (en) | 1989-11-02 |
Family
ID=16258645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19047083A Granted JPS6085826A (en) | 1983-10-12 | 1983-10-12 | Power source for electric-discharge machining |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6085826A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6446126U (en) * | 1987-09-16 | 1989-03-22 | ||
| US4945199A (en) * | 1986-11-14 | 1990-07-31 | Mitsubishi Denki Kabushiki Kaisha | Electric discharge machining method and device |
| US7268314B2 (en) | 2002-07-12 | 2007-09-11 | Mitsubishi Denki Kabushiki Kaisha | Discharge-processing power source device |
-
1983
- 1983-10-12 JP JP19047083A patent/JPS6085826A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4945199A (en) * | 1986-11-14 | 1990-07-31 | Mitsubishi Denki Kabushiki Kaisha | Electric discharge machining method and device |
| JPS6446126U (en) * | 1987-09-16 | 1989-03-22 | ||
| US7268314B2 (en) | 2002-07-12 | 2007-09-11 | Mitsubishi Denki Kabushiki Kaisha | Discharge-processing power source device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0151293B2 (en) | 1989-11-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS614620A (en) | Electric discharge machining power supply device | |
| JPH03104517A (en) | Power source device for electric discharge processing | |
| US3643405A (en) | Circuit arrangement for automatic control of the voltage of an electrical filter | |
| JPS6085826A (en) | Power source for electric-discharge machining | |
| WO1984001915A1 (en) | Electric discharge machining control circuit | |
| JPH0160376B2 (en) | ||
| JPH0244648B2 (en) | ||
| JPS58206312A (en) | Wire cut discharge machining power supply | |
| EP0034477B1 (en) | A power source circuit for an electric discharge machine | |
| JPS5926414B2 (en) | Electric discharge machining equipment | |
| US4443682A (en) | Superimposed high striking voltage power supply circuit for electrical discharge machining | |
| JP3252622B2 (en) | Machining power supply controller for wire electric discharge machine | |
| JPS6146252B2 (en) | ||
| JPS6027008A (en) | Power supply for electrical discharge machining | |
| US3485990A (en) | Electrical discharge machining power supply circuit | |
| JPS6116572B2 (en) | ||
| JPS6057972B2 (en) | Electric discharge machining equipment | |
| JPS5973226A (en) | Machining power supply of electric discharge machining device | |
| JPS6080522A (en) | Electric discharge machine | |
| US3524037A (en) | Fail transistor protective circuit for electrical discharge machining apparatus | |
| JP2581564B2 (en) | Electric discharge machine | |
| JPS59196123A (en) | Method and device for controlling electric discharge in electric discharge machine | |
| JPH0813416B2 (en) | Arc welding equipment | |
| JPS6057971B2 (en) | Electric discharge machining method | |
| JPH06226Y2 (en) | AC plasma arc welder |