JPH0777695B2 - Method and apparatus for detecting and controlling low level electric discharge in electric discharge machining - Google Patents
Method and apparatus for detecting and controlling low level electric discharge in electric discharge machiningInfo
- Publication number
- JPH0777695B2 JPH0777695B2 JP60229792A JP22979285A JPH0777695B2 JP H0777695 B2 JPH0777695 B2 JP H0777695B2 JP 60229792 A JP60229792 A JP 60229792A JP 22979285 A JP22979285 A JP 22979285A JP H0777695 B2 JPH0777695 B2 JP H0777695B2
- Authority
- JP
- Japan
- Prior art keywords
- discharge
- machining
- voltage
- circuit
- ratio
- 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 - Fee Related
Links
- 238000003754 machining Methods 0.000 title claims description 25
- 238000000034 method Methods 0.000 title claims description 13
- 239000007788 liquid Substances 0.000 claims description 11
- 238000009760 electrical discharge machining Methods 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 claims 4
- 238000001514 detection method Methods 0.000 claims 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004070 electrodeposition Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
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
- B23H1/024—Detection of, and response to, abnormal gap conditions, e.g. short circuits
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、放電加工に関し、より詳しくは、放電加工中
に良好な加工面を得る方法並びにそのための装置に関す
る。Description: TECHNICAL FIELD The present invention relates to electric discharge machining, and more particularly, to a method for obtaining a good machined surface during electric discharge machining and an apparatus therefor.
放電加工に際して、火花の発生の直後に位置される時間
窓内において火花電圧を測定して火花条件を制御するこ
とは、以前から知られている。これは主に短絡を検出す
るために行なわれるが、或は閾値以下では放電エネルギ
ーの大部分が電極間のスペースを占有する誘電液（加工
液）中に消散されることにもよる。誘電液は、温度の効
果の下にすみやかに劣化し、誘電液中に炭素が生成し、
この炭素が電極に付着し、その幾何学的形状を局所的に
劣化させる。そのため加工面にピンホール又は変色部分
を生ずる。短絡は、一般に、侵食された粒子からできて
る金属ブリツジ（ponts metalliques）の形成に基因す
ることから、それを通る電流を保持することが普通行な
われ、それによつて、誘電媒体を加熱するおそれなし
に、金属ブリツジの消失を助ける。It has been known for a long time during spark erosion to control spark conditions by measuring spark voltage within a time window located immediately after spark generation. This is mainly done to detect a short circuit, but also because below the threshold most of the discharge energy is dissipated in the dielectric fluid (working fluid) occupying the space between the electrodes. The dielectric liquid quickly deteriorates under the effect of temperature, carbon is generated in the dielectric liquid,
This carbon attaches to the electrode and locally degrades its geometry. Therefore, a pinhole or a discolored portion is generated on the processed surface. Short circuits are generally due to the formation of metal bridges made of eroded particles, so that it is common practice to retain the current through them, thereby eliminating the risk of heating the dielectric medium. In addition, it helps the disappearance of metal bridges.
その反対に火花電圧が、火花の下限閾値レベルより小さ
いが短絡閾値よりは大きい場合には誘電液がすみやかに
加熱されるおそれがあるため、この場合は、読出窓の終
了後直ちに加工電流を中断させることが望ましい。On the contrary, if the spark voltage is lower than the lower threshold level of the spark but higher than the short circuit threshold, the dielectric liquid may be heated quickly.In this case, the machining current is interrupted immediately after the end of the reading window. It is desirable to let
本発明は、誘電液中に消散されるエネルギーを制限する
ことにより、誘電液が分解されないようにする方法と、
この方法を実施する装置とを提供することを目的として
いる。The present invention provides a method of preventing decomposition of a dielectric liquid by limiting the energy dissipated in the dielectric liquid,
It is an object to provide an apparatus for carrying out this method.
この目的を達成するための本発明は、特許請求の範囲第
１〜５項に示すように定義される。本発明の好ましい実
施態様によれば、加工域内にある誘電液は、中断される
放電の比が25％を超過したり、又は、中断される次々の
パルスの数が或る値を超過したりしたときには直ちに、
電極の脈動によって誘電液は更新される。その場合、サ
ーボ制御される電極間の平均距離は増大し、放電を受け
る液の容積を増大させる。The present invention for achieving this object is defined as shown in claims 1 to 5. According to a preferred embodiment of the invention, the dielectric liquid present in the working zone has a ratio of interrupted discharges exceeding 25%, or the number of successive pulses interrupted exceeds a certain value. When you do, immediately
The dielectric liquid is renewed by the pulsation of the electrodes. In that case, the average distance between the servo-controlled electrodes increases, which increases the volume of the liquid undergoing the discharge.
火花電圧が低下したときは両方の電極を相互から隔だて
ることが普通である。本発明の利点は、電圧値が短絡に
より下限値よりも低くなつても、放電が持続され、放電
のエネルギーが、短絡を生じさせた１以上の金属ブリツ
ジ中に消散されることにより、誘電液を加熱するおそれ
なしに、侵食粒子の柱状体をすみやかに破壊しうること
にある。When the spark voltage drops, it is common to separate both electrodes from each other. The advantage of the present invention is that even if the voltage value becomes lower than the lower limit value due to the short circuit, the discharge is sustained and the energy of the discharge is dissipated in the one or more metal bridges that caused the short circuit. That is, the columnar body of the eroded particles can be promptly destroyed without fear of heating the.
実際に、短絡の際に電流を遮断した場合、短絡を除く只
１つの手段は、両電極を相互に離隔させることであろ
う。この機械的破壊方法の主要な難点は、両電極が相互
から十分に隔てられた場合にしかこの破壊が生じないこ
とである。加工を再開するには両電極を再び近付けなけ
ればならない。しかし機械的な運動の応答時間のため、
無効時間が長くなり、加工効率が低下する。本発明によ
り、この不具合をなくす方法が提案される。In fact, if the current is interrupted during a short circuit, the only way to eliminate the short circuit would be to separate the electrodes from each other. The main difficulty with this mechanical destruction method is that it only occurs if both electrodes are well separated from each other. Both electrodes must be brought closer together to resume processing. However, because of the response time of mechanical movement,
The ineffective time becomes long and the processing efficiency decreases. The present invention proposes a method of eliminating this inconvenience.
次に、本発明の好ましい実施例を示した図面を参照して
説明する。A preferred embodiment of the present invention will now be described with reference to the drawings.
第１図には、いろいろの形式の火花のための加工電圧
と、この電圧の読出し窓の持続時間Ｆと火花電流とが、
時間の関数として図示されている。FIG. 1 shows the processing voltage for various types of sparks, the duration F of the reading window of this voltage and the spark current.
Illustrated as a function of time.
最初の２回の火花A1,A2に対する電圧は、電圧の上限値V
2（例えば20Vとしてよい）よりも高く、火花は、時間T1
の経過の間保持されている。次の２回の火花B1,B2に対
する測定電圧の値は、電圧の上限値V2よりも低く、電圧
の下限値V1（例えば5Vとしてよい）よりも高く、火花
は、読出し終了時に遮断される。The voltage for the first two sparks A 1 , A 2 is the upper limit value V of the voltage.
Higher than 2 (may be 20V for example), the spark is time T 1
Held for the course of. The value of the measured voltage for the next two sparks B 1 and B 2 is lower than the upper limit value V 2 of the voltage and higher than the lower limit value V 1 of the voltage (for example, 5V may be used), and the spark is generated at the end of reading Be cut off.
５回目の火花Ｃに対する電圧は、下限値V1よりも低くな
る。これは短絡状態を表わし、この短絡を惹起させた金
属ブリツジを溶解させるための火花が保持される。The voltage for the fifth spark C becomes lower than the lower limit value V 1 . This represents a short circuit condition in which sparks are retained to melt the metal bridge that caused this short circuit.
本発明による制御方法を実施するための装置の機能的配
列が第２図に示され、この図において１は、工具電極、
２は被加工物電極である。加工パルス発生回路は、一例
として、直流電圧源３と、限流抵抗19と、スイツチ４と
を有し、このスイツチは、放電開始を検出するためのシ
ユミットトリガ回路５と、火花の持続時間T1を固定させ
るための第１単安定フリツプフロツプ６と、２個のパル
ス間の間隔の持続時間T2を固定させるための第２単安定
フリツプフロツプ７と、一方の入力部がフリツプフロツ
プ７に、他方の入力部がパイロツト回路にそれぞれ接続
されているANDゲート15とによつて制御される。The functional arrangement of the device for carrying out the control method according to the invention is shown in FIG. 2, in which 1 is a tool electrode,
Reference numeral 2 is a workpiece electrode. The machining pulse generation circuit has, as an example, a DC voltage source 3, a current limiting resistor 19 and a switch 4. The switch has a short trigger trigger circuit 5 for detecting the start of discharge, and a spark duration time. A first monostable flip-flop 6 for fixing T 1 , a second monostable flip-flop 7 for fixing the duration T 2 of the interval between two pulses, one input to the flip-flop 7, the other one Is controlled by AND gates 15 connected to the pilot circuit.
２個の比較器8,9を含むこのパイロツト回路は、基準電
圧値としての電圧の上限値V2及び下限値V1と、２つの電
極の端子の端子とを比較する。ANDゲート10は、単安定
フリツプフロツプ12（パルス発生回路のシユミツトトリ
ガー５によつて制御される）によつて固定される時間Ｆ
が経過する間、２つの基準電圧の中間に測定電圧が含ま
れている場合に、１つの出力信号を送出する（パイロッ
ト回路は比較器８、９と、ANDゲート10とを備える）。A
NDゲート10の出力信号は、シユミツトトリガー５の出力
信号によつて、即ち、１回の放電ごとに、シフトレジス
ター13に記憶されると共に、ANDゲート15の入力部にイ
ンバーター11を介し供給される。アツプダウンカウンタ
ー14は、シフトレジスター13の記憶時間の間パイロツト
回路により検出された特別の放電のバランスシートを形
成している。このバランスシートは、シフトレジスター
13の数値容量に等しい全放電回数をもたらすのに必要な
時間の経過の間に検出された放電の比率の目安値を表わ
している。数Ｎの形で表わされるこのバランスシート
は、記憶回路18中に記憶された基準数NOと、論理回路16
において比較され、数Ｎが基準数NOに等しくなつた時
に、工具電極１と被加工物電極２との間の平均距離を増
大させ、そして／又は、工具電極１の一時的な後退又は
脈動を制御し、そして／又は、単安定フリツプフロツプ
７によつて定まる持続時間T2を増大させるために、１つ
の信号が作成される。基準数NOは、一例として、シフト
レジスター13の数値容量の1/4に等しい値に定めること
ができる。平均火花電圧に応答して被加工物電極２に対
する工具電極１の位置を調節するための工具電極位置調
節回路17の基準値を一時的に変更することによつて、常
法に従つて、工具電極１を脈動させる。This pilot circuit, which includes two comparators 8 and 9, compares the upper limit value V 2 and the lower limit value V 1 of the voltage as reference voltage values with the terminals of the two electrodes. The AND gate 10 has a time F fixed by a monostable flip-flop 12 (controlled by the shift trigger 5 of the pulse generating circuit).
During a period of time elapses, one output signal is sent out if the measured voltage is contained in the middle of the two reference voltages (the pilot circuit comprises comparators 8, 9 and AND gate 10). A
The output signal of the ND gate 10 is stored in the shift register 13 and supplied to the input part of the AND gate 15 through the inverter 11 by the output signal of the shift trigger 5, that is, every discharge. It The up-down counter 14 forms a balance sheet for the particular discharge detected by the pilot circuit during the storage time of the shift register 13. This balance sheet is a shift register
It represents a measure of the ratio of the discharges detected during the passage of time necessary to bring the total number of discharges equal to the numerical capacity of 13. This balance sheet, represented in the form of the number N, contains the reference number N O stored in the memory circuit 18 and the logic circuit 16
And increasing the average distance between the tool electrode 1 and the work piece electrode 2 when the number N becomes equal to the reference number N O and / or a temporary retraction or pulsation of the tool electrode 1. One signal is generated to control the signal and / or to increase the duration T 2 determined by the monostable flip-flop 7. For example, the reference number N O can be set to a value equal to 1/4 of the numerical capacity of the shift register 13. By temporarily changing the reference value of the tool electrode position adjusting circuit 17 for adjusting the position of the tool electrode 1 with respect to the workpiece electrode 2 in response to the average spark voltage, the tool is Pulsate the electrode 1.
第２図の制御装置の好ましい変形例の機能的な接続が第
３図に示され、この第３図において、第２図の要素と同
一又は類似の要素は、第２図と同じ符号によつて示さ
れ、これらの要素についての説明は割愛されている。The functional connection of a preferred variant of the control device of FIG. 2 is shown in FIG. 3, in which elements which are identical or similar to those of FIG. 2 are designated by the same reference numerals. , And explanations of these elements are omitted.
前述の実施例と同様に、第３図の回路も、２個の比較器
8,9を有し、電極1,2の端子電圧を２つの基準電圧（上限
値V2と下限値V1）と比較する。除去すべき２つの基準電
圧の間に測定電圧値が含まれているとANDゲート10から
出力信号が送出される。ANDゲート10のこの出力信号
は、読出窓の終了後直ちに双安定フリツプフロツプ21に
記憶される。このフリツプフロツプ21は、火花開始の検
出時にＯにリセツトされる。フリツプフロツプ21の出力
信号は、単安定フリツプフロツプ６の出力信号によつ
て、即ち、中断されるか又は中断されない放電が発生す
るつど単安定フリツプフロツプ６の出力信号によつてシ
フトレジスター13に記憶されると共に、インバーター11
を介して、ANDゲート15の入力部に供給される。アツプ
ダウンカウンター14、シフトレジスター13、論理回路1
6、記憶回路18及び工具電極位置調節回路17の作用は、
前記の実施例とほぼ同様である。カウンター21は、中断
される一連のパルスのバランスシートを作成する。カウ
ンター21は、増分され、単安定フリツプフロツプ６によ
つて供給される信号の終了時にＯに戻る。カウンター21
は、パルスが中断されないつどＯにリセツトされる。第
２単安定フリツプフロツプ７及び工具電極位置調節回路
17に対するカウンター21の作用は、カウンター14と同様
である。Similar to the above-described embodiment, the circuit of FIG. 3 also has two comparators.
Comparing the terminal voltage of electrodes 1 and 2 with two reference voltages (upper limit value V 2 and lower limit value V 1 ). An output signal is output from the AND gate 10 when the measured voltage value is contained between the two reference voltages to be removed. This output signal of the AND gate 10 is stored in the bistable flip-flop 21 immediately after the end of the read window. The flip-flop 21 is reset to O when the spark start is detected. The output signal of the flip-flop 21 is stored in the shift register 13 by the output signal of the monostable flip-flop 6, that is, by the output signal of the monostable flip-flop 6 each time an interrupted or uninterrupted discharge occurs. , Inverter 11
Is supplied to the input section of the AND gate 15. Up-down counter 14, shift register 13, logic circuit 1
6, the operation of the memory circuit 18 and the tool electrode position adjustment circuit 17,
This is almost the same as the above embodiment. Counter 21 creates a balance sheet of a series of interrupted pulses. The counter 21 is incremented and returns to O at the end of the signal provided by the monostable flip-flop 6. Counter 21
Is reset to O each time the pulse is uninterrupted. Second monostable flip-flop 7 and tool electrode position adjustment circuit
The action of counter 21 on 17 is the same as counter 14.
第１図は、いくつかの別々の形式の火花の期間中におい
て、複数の可変の電気的状態を時間の関数として示した
線図、第２図は、本発明による制御方法を実施する装置
を示す略接続図、第３図は第２図の装置の変形例を示す
略接続図である。 符号の説明 １……工具電極、２……被加工物電極、V1……電圧の下
限値（第１レベル）、V2……電圧の上限値（第２レベ
ル）。FIG. 1 shows a diagram of a plurality of variable electrical states as a function of time during several different types of sparks, and FIG. 2 shows an apparatus for implementing the control method according to the invention. FIG. 3 is a schematic connection diagram, and FIG. 3 is a schematic connection diagram showing a modified example of the apparatus shown in FIG. Description 1 ...... tool electrode of code, 2 ...... workpiece electrode, the lower limit value of V 1 ...... voltage (first level), V 2 ...... upper limit value of the voltage (second level).
Claims (8)
圧パルスの幅よりも遥に小さい所定期間放電電圧を測定
する段階、 その測定電圧が短絡電圧よりも高い第１の電圧レベルと
正常放電電圧よりも低い第２の電圧レベルとの間である
とき加工電圧パルスを遮断して、工具電極と被加工物電
極との間の加工間隙に低電位放電が現れて生じる誘電液
の望ましくない温度上昇を防止する段階、そして 加工間隙で短絡が検出されても加工間隙を増大せしめる
ことなく放電加工を継続して、加工間隙を橋絡する加工
屑を消散せしめて短絡を消滅せしめるまで大きな放電エ
ネルギを加工屑の橋絡中に消散せしめることを特徴とす
る放電加工方法。1. A step of detecting the start of each machining voltage pulse and measuring a discharge voltage for a predetermined period much smaller than the width of the machining voltage pulse, the measured voltage being normal to a first voltage level higher than a short circuit voltage. An undesired dielectric liquid produced by interrupting the machining voltage pulse when between a second voltage level lower than the discharge voltage and causing a low potential discharge to appear in the machining gap between the tool electrode and the workpiece electrode. At the stage of preventing temperature rise, and even if a short circuit is detected in the machining gap, discharge machining is continued without increasing the machining gap and a large discharge is generated until the machining chips bridging the machining gap are dissipated and the short circuit disappears. An electric discharge machining method characterized in that energy is dissipated in a bridge of machining chips.
止する段階が、 低電位放電の数を計数して加工電圧パルスに対する低電
位放電の比を決定する段階と、 その比を所定の基準比と比較する段階と、 その比が基準比を越えるとき少なくとも一つの加工パラ
メータを変える段階とを含む請求項１に記載の放電加工
方法。2. The step of preventing an undesired temperature rise of the dielectric liquid comprises the steps of counting the number of low potential discharges to determine the ratio of the low potential discharges to the machining voltage pulses, and the ratio being a predetermined criterion. The electrical discharge machining method according to claim 1, comprising the steps of comparing with a ratio, and changing at least one machining parameter when the ratio exceeds a reference ratio.
止する段階が、 低電位放電の数を決定する段階と、 その数が所定値を越えるとき少なくとも一つの加工パラ
メータを変える段階とを含む請求項１に記載の放電加工
方法。3. The step of preventing undesired temperature rise of the dielectric liquid comprises the steps of determining the number of low potential discharges and changing at least one processing parameter when the number exceeds a predetermined value. The electric discharge machining method according to claim 1.
比を越えるとき被加工物電極から工具電極を一時的に後
退させるか、または平均加工電流を減少させる請求項２
に記載の放電加工方法。4. The tool electrode is temporarily retracted from the workpiece electrode or the average machining current is reduced when the ratio of the low potential discharge to the discharge pulse exceeds the reference ratio.
The electrical discharge machining method described in.
工物電極から工具電極を一時的に後退させるか、または
平均加工電流を減少させる請求項３に記載の放電加工方
法。5. The electric discharge machining method according to claim 3, wherein the tool electrode is temporarily retracted from the workpiece electrode or the average machining current is reduced when the number of low potential discharges exceeds a predetermined value.
圧パルスを発生させるパルス発生器と、 放電が開始される瞬時点を検出する検出回路と、 放電開始後所定時間放電を維持するよう前記の検出回路
によって制御されるタイムベース手段と、 被加工物電極と工具電極との間の相対変位を行わせるサ
ーボモーターと、 電極間において所定の放電距離を保つ移動速度調節回路
と、 放電開始を基準として定めた読出窓内の放電電圧の測定
回路と、 を備えた放電加工において被加工物電極に対する工具電
極の送りを制御する制御装置において、 前記の読出窓内で測定した加工電圧が短絡電圧よりも高
い第１の電圧レベルと正常放電電圧よりも低い第２の電
圧レベルとの間に含まれるとき放電を遮断するよう前記
のパルス発生回路を制御するパイロット回路と、 放電を遮断する数を評価する評価回路と、 この数の評価を所定値と比較して少なくとも一つの加工
パラメータを変えるため制御信号を送出する比較器と を備えることを特徴とする制御装置。6. A pulse generator for generating successive machining voltage pulses separated from each other by a rest time, a detection circuit for detecting an instantaneous point at which discharge is started, and a discharge circuit for maintaining discharge for a predetermined time after the start of discharge. The time base means controlled by the detection circuit, the servo motor that performs relative displacement between the workpiece electrode and the tool electrode, the moving speed adjustment circuit that maintains a predetermined discharge distance between the electrodes, and the discharge start In a control device that controls the feed of the tool electrode to the workpiece electrode in electrical discharge machining, which has a circuit for measuring the discharge voltage in the readout window that is set as a reference, and the machining voltage measured in the readout window is a short-circuit voltage. A pi for controlling the pulse generation circuit to interrupt the discharge when included between a higher first voltage level and a second voltage level lower than the normal discharge voltage. A lot circuit, an evaluation circuit for evaluating the number of discharge interruptions, and a comparator for comparing the evaluation of this number with a predetermined value and sending a control signal for changing at least one processing parameter are characterized. Control device.
する遮断の数の比を決定し、前記の比較器はこの比が所
定値を越えるとき制御信号を送出する請求項６に記載の
制御装置。7. The control according to claim 6, wherein said evaluation circuit determines the ratio of the number of interruptions to the number of machining voltage pulses, said comparator issuing a control signal when this ratio exceeds a predetermined value. apparatus.
の数を決定し、前記の比較器はこの数が所定値を越える
とき制御信号を送出する請求項６に記載の制御装置。8. The control device according to claim 6, wherein said evaluation circuit determines the number of successive pulses to be interrupted and said comparator outputs a control signal when this number exceeds a predetermined value.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH4953/84-0 | 1984-10-16 | ||
| CH4953/84A CH662074A5 (en) | 1984-10-16 | 1984-10-16 | Method for controlling the sparking conditions during electrical discharge (spark erosion) machining and device for its implementation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61159326A JPS61159326A (en) | 1986-07-19 |
| JPH0777695B2 true JPH0777695B2 (en) | 1995-08-23 |
Family
ID=4285393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60229792A Expired - Fee Related JPH0777695B2 (en) | 1984-10-16 | 1985-10-15 | Method and apparatus for detecting and controlling low level electric discharge in electric discharge machining |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0777695B2 (en) |
| CH (1) | CH662074A5 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2559219B2 (en) * | 1986-08-06 | 1996-12-04 | 株式会社ソディック | Perforation electric discharge machine |
| JP2654334B2 (en) * | 1993-06-16 | 1997-09-17 | 韓國原子力研究所 | Arc prevention method by classification of EDM waveform |
| US8134096B2 (en) | 2006-10-20 | 2012-03-13 | Mitsubishi Electric Corporation | Power supply-control device for electrical discharge machining apparatus |
| CN101291768B (en) | 2006-10-20 | 2012-05-02 | 三菱电机株式会社 | Power supply control apparatus for discharging processor |
| WO2009098764A1 (en) * | 2008-02-06 | 2009-08-13 | Mitsubishi Electric Corporation | Power control device for electric discharge machine |
| FR3083999B1 (en) * | 2018-07-23 | 2020-06-26 | Thermocompact | METHOD AND DEVICE FOR PREVENTING BREAKDOWN OF ELECTRODE WIRE DURING EROSIVE SPARKING MACHINING |
| EP4678320A1 (en) | 2024-07-11 | 2026-01-14 | Agie Charmilles SA | Method and apparatus for machining a multiple material workpiece by electrical discharge machining |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5548534A (en) * | 1978-10-04 | 1980-04-07 | Hitachi Seiko Ltd | Electric spark machine |
| US4688935A (en) * | 1983-06-24 | 1987-08-25 | Morton Thiokol, Inc. | Plasma spectroscopic analysis of organometallic compounds |
-
1984
- 1984-10-16 CH CH4953/84A patent/CH662074A5/en not_active IP Right Cessation
-
1985
- 1985-10-15 JP JP60229792A patent/JPH0777695B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61159326A (en) | 1986-07-19 |
| CH662074A5 (en) | 1987-09-15 |
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