JPS6071125A - Electric discharge machine - Google Patents

Electric discharge machine

Info

Publication number
JPS6071125A
JPS6071125A JP17704283A JP17704283A JPS6071125A JP S6071125 A JPS6071125 A JP S6071125A JP 17704283 A JP17704283 A JP 17704283A JP 17704283 A JP17704283 A JP 17704283A JP S6071125 A JPS6071125 A JP S6071125A
Authority
JP
Japan
Prior art keywords
voltage
frequency
machining
control signal
multiplier
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.)
Pending
Application number
JP17704283A
Other languages
Japanese (ja)
Inventor
Teruyuki Matsumura
松村　輝幸
Masashi Yukitomo
行友　正志
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fanuc Corp
Original Assignee
Fanuc Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fanuc Corp filed Critical Fanuc Corp
Priority to JP17704283A priority Critical patent/JPS6071125A/en
Publication of JPS6071125A publication Critical patent/JPS6071125A/en
Pending legal-status Critical Current

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
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/14—Electric circuits specially adapted therefor, e.g. power supply
    • B23H7/18—Electric circuits specially adapted therefor, e.g. power supply for maintaining or controlling the desired spacing between electrode and workpiece

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

PURPOSE:To restore the normal electric discharge machining state by quickly and smoothly recovering from the abnormal discharge state in accordance with the directions from a program when an abnormal state such as short-circuited arc discharge is generated due to the abnormal reductive of the space between the material to be machined and the machining electrode. CONSTITUTION:A machining electric discharge voltage detecting means 5' detects the voltage of the space between a material to be machined 1 and machining electrode 2. The value detected when the voltage is in rising state is stored in a storage means such as a flip-flop circuit 10. Then, when the voltage of the discharging space is more than the first threshold (the normal state) a signal is input to a multiplier 71 via the terminal L3 of a wind comparator 11. Then the product of a voltage-frequency converter 6 and the multiplier factor of the multiplier 71 is input to the adding terminal of a reversible counter 8' and a servo- mechanism 3 is driven forwardly at very low speed on the basis of the output from a frequency-voltage converter 9. According to this construction, the normal electric discharge machining state can be restored.

Description

【発明の詳細な説明】 （１）発明の技術分野 本発明はバーチカル型放電加工機の改良に関する。特に
、放電電極が短絡する等の異常時に、この異常状態を急
速に解除する改良に関する。DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to an improvement in a vertical electrical discharge machine. In particular, the present invention relates to an improvement for quickly resolving the abnormal state when the discharge electrode is short-circuited or the like.

（２）技術の背景 バーチカル型放電加工機とは、水・油等比較的粘性の大
きい絶縁性液体中に浸漬された金属等の導電性被加工体
の被加工面に、黄銅等の導電性材料よりなる棒状加工電
極を接近させてこれら両者の間隔を一定に保ち、この間
隙に断続的放電を発生させ、この断続的放電によって被
加工体の加工領域を極めて局部的に軟化または溶融する
とともに加工領域近傍に圧力の断続的変化を発生させ、
この圧力の断続的変化によって、上記の軟化または溶融
した被加工体領域を剥離・除去してなす導電性材料特に
金属の加工機械をいう。(2) Background of the technology A vertical electrical discharge machine is a machine that uses a conductive material such as brass on the surface of a conductive workpiece such as metal that is immersed in a relatively viscous insulating liquid such as water or oil. Rod-shaped machining electrodes made of a material are brought close to each other and the distance between them is kept constant, and intermittent electric discharge is generated in this gap, and this intermittent electric discharge softens or melts the machining area of the workpiece extremely locally. Generates intermittent changes in pressure near the processing area,
This refers to a machine for processing conductive materials, particularly metals, that peels off and removes the softened or melted region of the workpiece by intermittent changes in pressure.

バーチカル型放電加工機にあっては、加工電極と被加工
体との間隙を正確に保持して平均放電電圧を一定に保持
し、断続放電を安定に持続させることが必須であるから
、数値制御（以下ＮＣという）装置等を使用して極めて
正確に加工電極を送るように駆動することが一般である
。In a vertical electric discharge machine, it is essential to accurately maintain the gap between the machining electrode and the workpiece, maintain a constant average discharge voltage, and maintain intermittent discharge stably, so numerical control is required. (hereinafter referred to as NC) is generally used to drive the processing electrode so as to send it extremely accurately.

（３）従来技術と問題点 バーチカル型放電加工機の加工電極送り制御機構の従来
技術における１例を第１図に示す。(3) Prior Art and Problems An example of the prior art machining electrode feed control mechanism for a vertical electrical discharge machine is shown in FIG.

図においてｌは被加工体であり、２は加工電極であり、
断続的電圧発生器２０により両者間には断続的電圧が印
加される。３は加工電極送り甫サーボ機構であり、４は
レゾルバ等の角位置検出手段である。５は電圧検出手段
であり、被加工体ｌと加工電極２との間隙の電圧を検出
する。６は電圧周波数変換器であり、放電間隙電圧の値
に比例した周波数を発生する。この周波数のクロック期
間当りの積ｑ値が一定値以下の場合、すなわち、短絡等
の異常状態でない場合は、この出力が乗算器７に印加さ
れてその出力が誤差レジスタ８に人力され、この誤差レ
ジスタ８のクロック期間当りの積算出力が周波数電圧変
換器９に人力され、この出力にもとづいてサーボ機構３
が微速前進駆動される。したがって、被加工体ｌと加工
電極２どの間隙の電圧が常に一定になるような速度でサ
ーボ機構３は微速前進駆動されることになる。In the figure, l is the workpiece, 2 is the processing electrode,
An intermittent voltage generator 20 applies an intermittent voltage between the two. 3 is a processing electrode feed servo mechanism, and 4 is an angular position detecting means such as a resolver. Reference numeral 5 denotes a voltage detection means, which detects the voltage in the gap between the workpiece l and the processing electrode 2. 6 is a voltage frequency converter, which generates a frequency proportional to the value of the discharge gap voltage. When the product q value per clock period of this frequency is less than a certain value, that is, when there is no abnormal condition such as a short circuit, this output is applied to the multiplier 7, and the output is inputted to the error register 8, and this error is The integrated output per clock period of the register 8 is inputted to the frequency-voltage converter 9, and based on this output, the servo mechanism 3
is driven forward at a very slow speed. Therefore, the servo mechanism 3 is driven forward at a very slow speed at such a speed that the voltage across the gap between the workpiece l and the processing electrode 2 is always constant.

一方、レゾルバ４の出力も誤差レジスタ８に人力されて
でイナーループとしての位置制御ループを構成している
。On the other hand, the output of the resolver 4 is also manually inputted to the error register 8 to form a position control loop as an inner loop.

ところで、被加工体ｌと加工電極２との間隙が一定値以
下となり、短絡的アーク放電等の異常放電状態に移行す
ると電圧検出手段５の検出電圧が一定値以下に生り電圧
周波数変換器６の発生する周波数のクロック期間当り積
算値が一定値以下になると、その出力は上記の乗算器７
への入力を遮断され、同時に反転されて、より大きな乗
数を有する他の乗算器７°に人力され、その出力が誤差
レジスタ８に入力されてサーボ機構３を急速後退させる
ように制御するように構成されていることが一般である
。急速後退動作が進行して被加工体ｌと加工電極２との
間隙の電圧が回復すれば後退動作を停止して再び前進動
作に移行する。By the way, when the gap between the workpiece l and the machining electrode 2 becomes less than a certain value and the state shifts to an abnormal discharge state such as short-circuit arc discharge, the detected voltage of the voltage detection means 5 becomes less than a certain value and the voltage frequency converter 6 When the integrated value per clock period of the frequency generated by
The input to the servo mechanism 3 is cut off and simultaneously inverted and inputted to another multiplier 7° with a larger multiplier, and its output is input to the error register 8 to control the servo mechanism 3 to rapidly retract. Generally, it is configured. When the rapid backward movement progresses and the voltage in the gap between the workpiece 1 and the processing electrode 2 is recovered, the backward movement is stopped and the forward movement starts again.

ところで、このとき、誤差レジスタ８には乗算器７から
出力された前進方向偏差値がすでにいくらか累積してい
ることが一般であるから、乗算器？°から出力された後
退方向偏差値は上記の前進方向偏差値をセットオフする
必要があるため、多少後退動作が遅れることは避は難い
。さらに、急速後退動作は、電圧周波数変換器６の出力
と乗算器７゛の乗数との積に追従してなされるが、電圧
周波数変換器６の出力が極めて小さいため、急速後退速
度が制限されるという欠点がある。By the way, at this time, it is common that the error register 8 has already accumulated some amount of the forward deviation value output from the multiplier 7, so the multiplier? Since it is necessary to set off the above-mentioned forward direction deviation value from the backward direction deviation value outputted from °, it is inevitable that the backward movement will be delayed to some extent. Further, the rapid retraction operation is performed by following the product of the output of the voltage frequency converter 6 and the multiplier of the multiplier 7', but since the output of the voltage frequency converter 6 is extremely small, the rapid retraction speed is limited. It has the disadvantage of being

（４）発明の目的 本発明の目的はこの欠点を解消することにあり、バーチ
カル型放電加工機において、万一、被加工体と加工電極
との間隙が異常に減縮して、短絡的アーク放電等異常放
電状態が発生した場合は、すみやかに、かつ、プログラ
ム的に、この異常状態を解消して正常な放電加工状態に
復帰させることとなし、結果として、すぐれた加工能率
と加工精度とを有する放電加工機を提供することにある
。(4) Purpose of the Invention The purpose of the present invention is to eliminate this drawback.In a vertical electric discharge machine, if the gap between the workpiece and the machining electrode is abnormally reduced, short-circuit arcing may occur. If an abnormal electrical discharge state occurs, the abnormal state will be promptly and programmatically resolved to restore the normal electrical discharge machining state.As a result, excellent machining efficiency and machining accuracy will be achieved. An object of the present invention is to provide an electric discharge machine having the following features.

（５）発明の構成 本発明の構°成は、加工電極送り用のサーボ機構３と、
該サーボ機構３によって駆動される加工電極２と被加工
体ｌとの間の放電間隙の電圧と該電圧が上昇中か下降中
かを検出する加工放電電圧検出手段５°と、該加工放電
電圧検出手段５”の出力電圧゛を周波数に変換する電圧
周波数変換手段６と、該周波数が第１の特定の値より大
きいことを条件として該周波数に特定の乗数を乗算する
乗算器７１と、前記周波数が第２の特定の値より小さい
ことを条件として負の大きな値を有する第１の特定の制
御信号を発生する手段７２と、前記周波数が前記第１の
特定の値より大きい条件と加工放電電圧が上昇中である
という条件との重複条件にもとづいて正の大きな値を有
する第２の特定の制御信号を発生する手段７３と、前記
乗算器７１の出力と前記第１の特定の制御信号と前記第
２の特定の制御信号とのいずれかが選択的に印加される
リバーシブルカウンタ８′と、前記第１の特定の制御信
号をカウントし前記第２の特定の制御信号をディスカウ
ントしその値が特定の値に達したことを条件として前記
第２の特定の制御信号が前記リバーシブルカウンタ８′
に印加されることを遮断して前記乗算器７１の出力を前
記リバーシブルカウンタ８′に印加する手段と、前記リ
バーシブルカウンタ８′の出力する周波数を電圧に変換
し前記サーボ機構３を制御する周波数電圧変換器９とを
有する放電加工機にある。(5) Configuration of the Invention The configuration of the present invention includes a servo mechanism 3 for feeding the processing electrode,
a machining discharge voltage detection means 5° for detecting the voltage in the discharge gap between the machining electrode 2 and the workpiece l driven by the servo mechanism 3 and whether the voltage is rising or falling; and the machining discharge voltage a voltage-frequency conversion means 6 for converting the output voltage of the detection means 5'' into a frequency; a multiplier 71 for multiplying the frequency by a specific multiplier on the condition that the frequency is greater than a first specific value; means 72 for generating a first specific control signal having a large negative value provided that the frequency is less than a second specific value; and a machining discharge when the frequency is greater than the first specific value. means 73 for generating a second specific control signal having a large positive value based on an overlapping condition with the condition that the voltage is increasing; and the output of the multiplier 71 and the first specific control signal. and a reversible counter 8' to which one of the second specific control signal and the second specific control signal is selectively applied; and a reversible counter 8' that counts the first specific control signal and discounts the second specific control signal. The second specific control signal is applied to the reversible counter 8' on the condition that the second specific control signal reaches a specific value.
a frequency voltage for controlling the servo mechanism 3 by converting the frequency output from the reversible counter 8' into a voltage; The electric discharge machine has a converter 9.

換言すれば、本発明は、万一、被加工体ｌと加工電極２
どの間隙が一定値以下となり短絡−アーク放電等、異常
放電状態が発生して、これを加工放電電圧検出手段５゛
が検出した場合は、これを条件として、一種のプログラ
ム制御をなさしめ、極めて急速にこの異常状態から離脱
させ再び正常状態に引きもとすこととしたものである。In other words, in the present invention, if the workpiece l and the processing electrode 2
If any gap becomes less than a certain value and an abnormal discharge condition such as short circuit/arc discharge occurs, and this is detected by the machining discharge voltage detection means 5, a kind of program control is performed with this as a condition, and the The idea was to quickly get out of this abnormal state and return to the normal state again.

すなわち、（イ）加工放電電圧検出手段５°が異常な低
電圧（第２の特定の値より更に小さい電圧）を検出した
ら、ただちに、正常状態における制御ループを解除して
、極めて大きな負の値を有する第１の特定の制御信号を
リバーシブルカウンタ８゛に印加して急速後退制御に移
行するとともに、この後退制御距離を記憶しておき、（
ロ）十分後退して上記異常な低電圧より高い第１の特定
の電圧まで回復して異常状態から解放されて通常の放電
状態に回復したら、ただちに極めて大きな正の値を有す
る第２の特定の制御信号をリバーシブルカウンタ８゛に
印加して急速前進制御に移行させ、この急速前進の距離
は上記の記憶されていた後退制御の距離よりわずかに少
なくしておき、（ハ）この距離だけ急速前進した後、再
び、加工放電電圧を第１の特定のイーより大きくなして
正畠加工状態である微速前進に移行させて、これを保持
するものであり、これら一連の制御動作をプログラム的
に実行させるものである。That is, (a) when the machining discharge voltage detection means 5 detects an abnormally low voltage (a voltage even smaller than the second specific value), it immediately cancels the control loop in the normal state and detects an extremely large negative value. A first specific control signal having a value of (
b) When the voltage is sufficiently retreated and recovered to the first specific voltage higher than the abnormal low voltage, the abnormal state is released and the normal discharge state is restored, the second specific voltage having an extremely large positive value is immediately discharged. A control signal is applied to the reversible counter 8゛ to shift to rapid forward control, and the distance of this rapid forward movement is slightly less than the memorized distance of backward control described above, and (c) rapid forward movement is performed by this distance. After that, the machining discharge voltage is made higher than the first specific E again to shift to the slow advance which is the Masahata machining state and maintain this state, and these series of control operations are executed programmatically. It is something that makes you

（６）発明の実施例 以下図面を参照しつつ、本発明の実施例に係るバーチカ
ル型放電加工機について更に説明する。(6) Embodiments of the Invention Below, a vertical electric discharge machine according to an embodiment of the present invention will be further described with reference to the drawings.

第２図参照 図においてｌは被加工体であり、２は加工電極であり、
断続的電圧発生器２０により両者間には断続的電圧が印
加される。３は加工電極送り用サーボ機構であり、４は
レゾルバ等の角位置検出手段である。５゛は電圧を検出
するとともに電圧か上Ａ中であるか下降中であるかを検
出する加工放電電圧検出手段であり、被加工体ｌと加工
電極２との間隙の電圧を検出するとともに、電圧が下降
状態にあるか上昇状態にあるかを識別する機能（この機
能は周知である。）を有し、この後者の検出値をフリン
プフロップ回路ｌＯ等の記憶手段に記憶しておく。６は
電圧周波数変換手段であり、この出力は例えばウィンド
コンパレータ等のディストリビューション機能を有する
手段１１に人力され、放電間隙電圧が第１のしきい値（
正帛状態）以上の場合はウィンドコンパレータ等ｌｌの
Ｌ３端子を介して乗算器７１に入力され、電圧周波数変
換器６の出力と乗算器７１の乗数との積がリバーシブル
カウンタ８゛の加算端子に入力され、この誤差レジスタ
のクロック期間当りの積算出力が周波数電圧変換器９に
人力され、この出力にもとついてサーボ機構３が微速前
進駆動される。In the diagram shown in FIG. 2, l is the workpiece, 2 is the processing electrode,
An intermittent voltage generator 20 applies an intermittent voltage between the two. 3 is a servo mechanism for feeding the processing electrode, and 4 is an angular position detecting means such as a resolver. 5 is a machining discharge voltage detection means that detects the voltage and detects whether the voltage is rising A or falling; it detects the voltage in the gap between the workpiece l and the machining electrode 2; It has a function of identifying whether the voltage is in a falling state or in a rising state (this function is well known), and this latter detected value is stored in a storage means such as a flip-flop circuit IO. Reference numeral 6 denotes a voltage frequency conversion means, the output of which is manually inputted to means 11 having a distribution function such as a window comparator, and the discharge gap voltage is set to a first threshold value (
In the above case, the signal is input to the multiplier 71 via the L3 terminal of the window comparator etc., and the product of the output of the voltage frequency converter 6 and the multiplier of the multiplier 71 is input to the addition terminal of the reversible counter 8. The integrated output of this error register per clock period is input to the frequency-voltage converter 9, and the servo mechanism 3 is driven forward at a very slow speed based on this output.

次に、放電間隙電圧が第２のしきい値（短絡アーク放電
状態等極めて低い電圧）以下となった場合はウィンドコ
ンパレータ等ＩＩのし、端子から発せられる信号にもと
づいてパルス発振器７２が動作して極めて大きな負の値
を有する第１の特定の信号かり／＜−シブルカウンタ８
゛の減算端子に入力され、この誤差レジスタ８′のクロ
ック期間当りの積算出力か周波数電圧変換器９に出力さ
れ、この出力にもとづいてサーボモータ３が急速後退さ
れる。これと同時に、パルス発振器７２の出力は記憶手
段１２に記憶される。すなわち、この急速後退速度は、
加工放電電圧検出手段５°の出力の支配を脱して全く独
立に制御される結果、極めて高速の後退速度が実現され
るものである。Next, when the discharge gap voltage becomes less than the second threshold (very low voltage such as in a short-circuit arc discharge state), the pulse oscillator 72 operates based on the signal emitted from the window comparator II and the terminal. A first specific signal having an extremely large negative value is detected by the counter 8.
The integrated output per clock period of the error register 8' is inputted to the subtraction terminal of the error register 8' and outputted to the frequency-voltage converter 9, and the servo motor 3 is rapidly retracted based on this output. At the same time, the output of the pulse oscillator 72 is stored in the storage means 12. In other words, this rapid retreat speed is
As a result of being completely independently controlled without being controlled by the output of the machining discharge voltage detection means 5°, an extremely high retraction speed is realized.

後退動作が進行して放電間隙電圧が第１のしきい値以上
になった場合は、ウィンドコンパレータ等１１のＬ２端
字の出力がＡＮＤ回路１３の一方の端端子に人力され、
上記のフリップフロップ回路等ｌＯの電圧上昇中を指示
する信号との重複条件をもって、パルス発振器７３が動
作して極めて大きな正の値を有する第２の特定の制御信
１号がリバーシブルカウンタ８°の加算端子に入力され
、この誤差１／ジスタ８゛のクロック期間当りの積算出
力が周波数電圧変換器９に出力され、この出力にもとづ
いてサーボモータ３か急速前進される。この場合も、急
速前進速度は、加工放電電圧検出手段５′の出力の支配
を脱して全く独立に制御される結果、極めて高速の前進
速度が実現されるものである。ただし、この急速前進動
作をするカウント数は上記の記憶手段１２を減算して、
この数が特定の値に達したときパルス発振器７３とリバ
ーシブルカウンタ８°との接続を遮断して、ＡＮＤ回路
１３の出力を乗算器７１に入力するスイッチング手段１
４が動作して正常微速前進に移行する。更に、クリップ
フロップ等１０をリセットすればＡＮＤ回路１３の出力
はＬ論理となるから当初の正常な制御状態に復帰・する
。When the retreating operation progresses and the discharge gap voltage exceeds the first threshold, the output of the L2 terminal of the window comparator etc. 11 is inputted to one end terminal of the AND circuit 13,
The pulse oscillator 73 operates and the second specific control signal 1 having an extremely large positive value is output to the reversible counter 8° under the condition of overlap with the signal indicating that the voltage of the flip-flop circuit etc. is increasing. This is input to the addition terminal, and the integrated output of this error 1/8 register per clock period is output to the frequency-voltage converter 9, and based on this output, the servo motor 3 is rapidly advanced. In this case as well, the rapid advance speed is completely independently controlled without being controlled by the output of the machining discharge voltage detection means 5', and as a result, an extremely high advance speed is achieved. However, the count number for this rapid forward movement is obtained by subtracting the above storage means 12.
Switching means 1 which cuts off the connection between the pulse oscillator 73 and the reversible counter 8° when this number reaches a specific value, and inputs the output of the AND circuit 13 to the multiplier 71.
4 operates and shifts to normal slow forward movement. Furthermore, if the clip-flop etc. 10 is reset, the output of the AND circuit 13 becomes L logic, and the original normal control state is restored.

以上の説明にあっては、上記のプログラムが必ず実現し
うるという事実を極力簡易に説明する目的をもって、極
めて単純な個別素子の組み合わせをもって構成した１例
を示しであるが、本発明の技術思想は上記せるとおり、
ＮＣ装置等を使用してソフト的に実現することが容易か
つ現実的であることは云うまでもない。In the above explanation, for the purpose of explaining as simply as possible the fact that the above program can definitely be realized, an example configured with a combination of extremely simple individual elements is shown, but the technical idea of the present invention is As stated above,
It goes without saying that it is easy and practical to realize this in software using an NC device or the like.

（７）発明の詳細 な説明せるとおり、バーチカル型放電加工機において、
万一、被加工体と加工電極との間隙が異常に減縮して、
短絡的アーク放電等異常放電状態が発生した場合は、す
みやかに、かつ、プログラム的にこの１異常状態を解消
して正常な放電加工状態に復帰させることとなし、結果
として、すぐれた加工能率と加工精度とを有する放電加
工機を提供することができる。(7) As explained in detail of the invention, in a vertical electric discharge machine,
In the unlikely event that the gap between the workpiece and the processing electrode shrinks abnormally,
If an abnormal discharge condition such as a short-circuit arc discharge occurs, this abnormal condition can be quickly and programmatically resolved to return to the normal electric discharge machining condition, resulting in excellent machining efficiency. It is possible to provide an electric discharge machine having high machining accuracy.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来技術におけるバーチカル型放電加工機の加
工電極送り制御機構の１例のブロック図である。第２図
は本発明の一実施例に係るバーチカル型放電加工機の加
工電極送り制御機構の１例のブロック図である。 ｌ・・Φ被加工体、２−・Φ加工電極、３・＠舎す−ボ
機構、　４・・・角位置検出手段、５・・・電圧検出手
段、６・・・電圧周波数変換器、　７．７°・・・乗算
器、　８・・・誤差レジスタ、９・・・周波数電圧変換
器、　５°・・・加工放電電圧検出手段、７１・・−乗
算器、７２・・・第１の特定の制御信号発生手段（パル
ス発振器）、７３　φ・中温２の特定の制御信号発生手
段（パルス発振器）、　８°・Φ−リバーシブルカウン
タ、　１ｏ・・・記憶手段（フリップフロップ回路等）
、１１・・・ディストリビューショーン機能を有する手
段（ウィンドコンパレータ等）、　１２拳・争　記憶手
段、　１３・−−ＡＮＤ回路、１４・１１１＋スイッチ
ング手段、　２０・・・断続的電圧発生器。 代理人　弁理士　寒川誠−FIG. 1 is a block diagram of an example of a machining electrode feed control mechanism of a vertical electric discharge machine in the prior art. FIG. 2 is a block diagram of an example of a machining electrode feed control mechanism of a vertical electric discharge machine according to an embodiment of the present invention. l...Φ workpiece, 2-*Φ machining electrode, 3.@shasubo mechanism, 4... angular position detection means, 5... voltage detection means, 6... voltage frequency converter, 7.7°...multiplier, 8...error register, 9...frequency voltage converter, 5°...machining discharge voltage detection means, 71...-multiplier, 72...first Specific control signal generating means (pulse oscillator) for 73 φ/medium temperature 2, 8°/φ-reversible counter, 1o...storage means (flip-flop circuit, etc.)
, 11...Means having a distribution function (window comparator, etc.), 12. Memory means, 13.--AND circuit, 14.111+switching means, 20. Intermittent voltage generator. Agent Patent Attorney Makoto Samukawa

Claims (1)

【特許請求の範囲】[Claims] 加工電極送り用のサーボ機構３と、該サーボ機構３によ
って駆動される加工電極２と被加工体１との間の放電間
隙の電圧と該電圧か上昇中か下降中かを検出する加工放
電電圧検出手段５′と、該加工放電電圧検出手段５°の
出力電圧を周波数に変換する電圧周波数変換手段６と、
該周波数か第１の特定の値より大きいことを条件として
該周波数に特定の乗数を乗算する乗算器？Ｉと、ｒｊｂ
記周波周波数２の特定の値より小さいことを条件として
負の大きな値を有する第１の特定の制御信号を発生する
手段７２と、前記周波数が前記第１の特定の値より大き
い条件と加工放電電圧が上昇中であるという条件との重
複条件にもとづいて正の大きな値を有する第２の特定の
制御信号を発生する手段７３と、前記乗算器７１の出力
と前記第１の特定の制御信号と前記第２の特定の制御信
号とのいずれかが選択的に印加されるリバーシブルカウ
ンタ８′と、前記第１の特定の制御信号をカウントし前
記第２の特定の制御信号をディスカウントしその値か特
定の値に達したことを条件として前記第２の特定の制御
信号が前記リバーシブルカウンタ８゛に印加されること
を遮断して前記乗算器７１の出力を前記リバーシブルカ
ウンタ８”に印加する手段と、前記リバーシブルカウン
タ８′の出力する周波数を電圧に変換し前記サーボ機構
３を制御する周波数電圧変換器９とを有する放電加工機
。A servo mechanism 3 for feeding the machining electrode, a voltage in the discharge gap between the machining electrode 2 and the workpiece 1 driven by the servo mechanism 3, and a machining discharge voltage for detecting whether the voltage is rising or falling. a detection means 5'; a voltage frequency conversion means 6 for converting the output voltage of the machining discharge voltage detection means 5° into a frequency;
A multiplier that multiplies the frequency by a specific multiplier, provided that the frequency is greater than a first specific value? I and rjb
means 72 for generating a first specific control signal having a large negative value under the condition that the frequency is smaller than a specific value of the recorded frequency 2; and a machining discharge when the frequency is greater than the first specific value. means 73 for generating a second specific control signal having a large positive value based on an overlapping condition with the condition that the voltage is increasing; and the output of the multiplier 71 and the first specific control signal. and a reversible counter 8' to which one of the second specific control signal and the second specific control signal is selectively applied; and a reversible counter 8' that counts the first specific control signal and discounts the second specific control signal. means for blocking application of the second specific control signal to the reversible counter 8'' and applying the output of the multiplier 71 to the reversible counter 8'' on the condition that the second specific control signal reaches a specific value; and a frequency-voltage converter 9 that converts the frequency output from the reversible counter 8' into voltage and controls the servo mechanism 3.
JP17704283A 1983-09-27 1983-09-27 Electric discharge machine Pending JPS6071125A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17704283A JPS6071125A (en) 1983-09-27 1983-09-27 Electric discharge machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17704283A JPS6071125A (en) 1983-09-27 1983-09-27 Electric discharge machine

Publications (1)

Publication Number Publication Date
JPS6071125A true JPS6071125A (en) 1985-04-23

Family

ID=16024122

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17704283A Pending JPS6071125A (en) 1983-09-27 1983-09-27 Electric discharge machine

Country Status (1)

Country Link
JP (1) JPS6071125A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4733043A (en) * 1985-11-22 1988-03-22 Colt Industries Inc. Ram stabilizing circuit for electrical discharge machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4733043A (en) * 1985-11-22 1988-03-22 Colt Industries Inc. Ram stabilizing circuit for electrical discharge machine

Similar Documents

Publication Publication Date Title
US3864541A (en) System for the controlling of an apparatus for the electric discharge machining etc.
US3988560A (en) Method and apparatus for controlling generation of machining pulses in EDM power supply
US3859186A (en) System and method for regulating electric discharge machining gap
JPS6071125A (en) Electric discharge machine
US3668361A (en) Structure for and method of electro erosion machining
KR850007021A (en) Electric discharge machine
EP0034477B1 (en) A power source circuit for an electric discharge machine
JPS5815631A (en) Control system for electric discharge processing machine
US4431895A (en) Power source arrangement for electric discharge machining
GB2053064A (en) Electrical discharge machining method and apparatus
JPH058121A (en) Electric discharge macining apparatus
JPS5930620A (en) Wire-cut electric discharge machining apparatus
JPS6116572B2 (en)
JPS5942218A (en) Working feed control device for wire cut electric discharge machine
JPH0230431A (en) Power unit for discharge processing
CN211661268U (en) Energy-saving control device for precision discharge machining power supply
JPS6240125B2 (en)
JPH04129613A (en) Method and device for controlling electric discharge machine
US3524037A (en) Fail transistor protective circuit for electrical discharge machining apparatus
JPS60146624A (en) Method of electric discharge machining and device therefor
KR880002561B1 (en) Method and apparatus for controlling an electric discharge machine
JPS61111813A (en) Spark erosion apparatus
KR0178584B1 (en) Power unit of wire electric discharge machine
JPS59196123A (en) Method and device for controlling electric discharge in electric discharge machine
SU1138927A1 (en) Transistor generator for electric discharge machining