JPH0647624A - Electric discharge machining device - Google Patents

Electric discharge machining device

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Publication number
JPH0647624A
JPH0647624A JP20390792A JP20390792A JPH0647624A JP H0647624 A JPH0647624 A JP H0647624A JP 20390792 A JP20390792 A JP 20390792A JP 20390792 A JP20390792 A JP 20390792A JP H0647624 A JPH0647624 A JP H0647624A
Authority
JP
Japan
Prior art keywords
tank
machining
working fluid
conductivity
working
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
JP20390792A
Other languages
Japanese (ja)
Inventor
Koetsu Wada
光悦 和田
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP20390792A priority Critical patent/JPH0647624A/en
Publication of JPH0647624A publication Critical patent/JPH0647624A/en
Pending legal-status Critical Current

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  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

PURPOSE:To provide an electric discharge machining device by which working liquid prepared to an appropriate electric conductivity according to processing conditions can be supplied in a working clearance quickly. CONSTITUTION:Working fluid 5 in a second tank 8 from which processing sludge 6 is removed, is so controlled as to be supplied in a working clearance via conduits 22, 25 by a control means 19 in roughing and when electric conductivity of the working fluid 5 in the second tank 8 is a set level of a first conductivity discrimination means 15 or more, the working fluid 5 is supplied to the processing clearance, while returning the working liquid treated in an ion exchange means 17a by the control means 19 to the second tank 8 via conduits 22a, 24. In finishing, the control means 19 controls the working liquid 5 treated in the ion exchange means 17a so as to supply it to the working clearance via conduits 23a, 25.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、放電加工装置に関する
ものであり、特に、電極と被加工物で形成される加工間
隙に水もしくは水を主体とする加工液を循環供給しなが
ら放電加工を行う放電加工装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric discharge machine, and particularly to electric discharge machining while circulating or supplying water or a machining liquid mainly composed of water to a machining gap formed by an electrode and a workpiece. The present invention relates to an electric discharge machine for performing.

【０００２】[0002]

【従来の技術】従来のこの種の放電加工装置に関連する
ものとして、特開平３−２３９４１４号公報に掲載の技
術を挙げることができる。2. Description of the Related Art A technique disclosed in Japanese Patent Application Laid-Open No. 3-239414 can be mentioned as a device related to this type of conventional electric discharge machining apparatus.

【０００３】従来の水もしくは水を主体とする加工液を
使用して放電加工を行う放電加工装置においては、放電
加工を行っているときにその時間経過に応じて、放電加
工中に発生する加工スラッジの一部が加工液中でイオン
化したり、空気中の炭酸ガスを溶解してイオン化するた
め加工液の電導度が高くなる。一方、安定な放電加工を
行なうには、荒加工時と仕上加工時等の加工条件の変化
に応じて加工液の電導度が所定範囲内に維持される必要
がある。In the conventional electric discharge machining apparatus which performs electric discharge machining using water or a machining liquid mainly composed of water, machining which occurs during electric discharge machining during electric discharge machining depending on the elapsed time. Part of the sludge is ionized in the working fluid, or carbon dioxide in the air is dissolved and ionized, so that the electrical conductivity of the working fluid is increased. On the other hand, in order to perform stable electric discharge machining, it is necessary to maintain the electric conductivity of the machining fluid within a predetermined range according to changes in machining conditions such as rough machining and finish machining.

【０００４】例えば、水を主体としその中に有機化合物
を混ぜた加工液を使用する放電加工装置では、高速且つ
高精度という二つの要請に応え得るものが必要とされて
おり、電極と被加工物の対向面積が７００〜１０００ｃ
ｍ2 のような大面積の場合、高速加工では１００ｇ／ｍ
ｉｎ、高精度加工では仕上面粗さが３０μＲｍａｘ以下
の加工も可能になってきている。For example, in an electric discharge machining apparatus which mainly uses water and uses a machining liquid in which an organic compound is mixed, an electric discharge machine that can meet two requirements of high speed and high accuracy is required. Object facing area is 700-1000c
For large area such as m 2 , 100 g / m for high speed machining
In high-precision machining, machining with a finished surface roughness of 30 μRmax or less has become possible.

【０００５】このように広い範囲に亘って加工エネルギ
ーを変えるような加工では、加工液の電導度を調整する
ことにより、加工安定度、加工精度が大幅に異なってく
る。なぜならば、水もしくは水を主体とし、その中に有
機化合物を混ぜた加工液を用いる場合には、加工液が電
導性であるため、加工間隙のインピーダンスＲは、電極
と被加工物間の距離をｇ、電極と被加工物の対向面積を
Ｓ、加工液の電導度をρとするとき、Ｒ＝ｇ／（ρ・
Ｓ）の関係式が成立つ。つまり、加工間隙がせまい程、
対向面積が大きい程、また電導度が大きい程インピーダ
ンスは低下する。したがって、上記のような対向面積が
７００〜１０００ｃｍ2 の場合に、仕上加工を行おうと
すると、加工間隙が小さくなり、且つ対向面積も大きい
ので、加工間隙に加工電圧印加時には加工間隙のインピ
ーダンス低下によりオームの法則に基く電流が流れ無効
電流となる。このため、加工間隙への印加電圧が上昇せ
ず放電が不可能となるため、対向面積が大面積の場合に
は、加工液の電導度をイオン交換樹脂等で低下させる必
要がある。In the processing in which the processing energy is changed over a wide range in this way, the processing stability and the processing accuracy are greatly changed by adjusting the electric conductivity of the processing liquid. This is because, when using a working fluid mainly composed of water or water and having an organic compound mixed therein, the working fluid is conductive, and therefore the impedance R of the working gap is equal to the distance between the electrode and the workpiece. Is g, the facing area of the electrode and the work piece is S, and the electric conductivity of the working fluid is ρ, R = g / (ρ ·
The relational expression of S) is established. In other words, the smaller the machining gap,
The impedance decreases as the facing area increases and the conductivity increases. Therefore, when the facing area is 700 to 1000 cm 2 as described above, when finishing machining is performed, the working gap becomes small and the facing area is large. Therefore, when the working voltage is applied to the working gap, the impedance of the working gap decreases. A current based on Ohm's law flows and becomes a reactive current. For this reason, since the voltage applied to the machining gap does not rise and discharge becomes impossible, it is necessary to reduce the electric conductivity of the machining liquid with an ion exchange resin or the like when the facing area is large.

【０００６】したがって、所望の加工面粗さや加工面積
精度を得るには、加工の目的に応じて選定された加工条
件に応じて加工液の電導度を適宜調整する必要がある。
例えば、上記電極と被加工物の対向面積が７００〜１０
００ｃｍ2 で、仕上面粗さ３０μＲｍａｘ以下を目標に
する場合には、加工液の電導度は荒加工時で２から１０
μＳ／ｃｍ以下、仕上加工時で０．５から１μＳ／ｃｍ
以下であることが必要である。Therefore, in order to obtain the desired machined surface roughness and machined area accuracy, it is necessary to appropriately adjust the electric conductivity of the machining liquid according to the machining conditions selected according to the purpose of machining.
For example, the facing area of the electrode and the workpiece is 700 to 10
When the final surface roughness is 30 μRmax or less at 00 cm 2 , the electric conductivity of the working fluid is 2 to 10 at the time of roughing.
μS / cm or less, 0.5 to 1 μS / cm during finishing
It must be:

【０００７】また、前述したように水を主体とし、その
中に有機化合物を混ぜた加工液を使用する放電加工装置
は、最大加工速度１００ｇ／ｍｉｎを達成しており、加
工量が大きい放電加工に使用されている。しかし、短時
間で大量の加工スラッジを処理するために、フィルタエ
レメントに加工スラッジを付着させて加工液を濾過し、
フィルタが目詰まりしたら新しいフィルタに交換する方
法では、フィルタの交換頻度が多く、ランニングコスト
が高い。そのために、従来から前記フィルタによる濾過
工程の前にマグネット式フィルタによる濾過工程を入
れ、磁性体加工スラッジはマグネット式フィルタで除去
し、その他の加工スラッジはチューブ状の筒に珪素土を
プリコートしたフィルタエレメントで除去し、このフィ
ルタエレメントが目詰まりしたらプリコートした珪素土
ごと加工スラッジをフィルタ外部に排出し、再度チュー
ブ状の筒に新しい珪素土をプリコートし、加工液の濾過
を行う方法が採られている。Further, as described above, the electric discharge machining apparatus which mainly uses water and uses the machining liquid in which the organic compound is mixed achieves the maximum machining speed of 100 g / min, and the electric discharge machining is large. Is used for. However, in order to process a large amount of processing sludge in a short time, processing sludge is attached to the filter element to filter the processing liquid,
When the filter is clogged, the method of replacing with a new filter requires frequent replacement of the filter and high running cost. Therefore, conventionally, a filtration process by a magnet type filter is inserted before the filtration process by the filter, magnetic processed sludge is removed by a magnetic type filter, and other processed sludge is a filter in which a tubular cylinder is pre-coated with silicon earth. When the filter element is clogged with the element, the pre-coated silicon soil and the processed sludge are discharged to the outside of the filter, and the tube-shaped cylinder is again pre-coated with new silicon earth, and the processing liquid is filtered. There is.

【０００８】[0008]

【発明が解決しようとする課題】上記のような、従来の
水もしくは水を主体とする加工液を使用して放電加工を
行う放電加工装置では、前述したように加工条件を変更
する都度、あるいは所望の電導度が上昇する都度、加工
液タンク内の加工液の電導度を調整していた。したがっ
て、その時間がかかるだけでなく、イオン交換樹脂の消
耗が多大となり、調整時間の無駄とランニングコストの
増加を招いていた。In the above-described electric discharge machining apparatus for performing electric discharge machining using water or a machining fluid mainly composed of water, as described above, every time the machining conditions are changed, or Each time the desired conductivity was increased, the conductivity of the working fluid in the working fluid tank was adjusted. Therefore, not only the time is required, but also the ion exchange resin is greatly consumed, resulting in a waste of adjustment time and an increase in running cost.

【０００９】また、加工量が大きい放電加工を行うとき
は、前述したようなフィルタでは珪素土を補給するため
の作業時間が必要になり、ランニングコストが増大する
ばかりか、一次フィルタと二次フィルタで排出された加
工スラッジを別々に廃棄する作業が必要になり、その作
業性に問題があった。Further, when performing electric discharge machining with a large machining amount, the above-mentioned filter requires a working time for replenishing silicon earth, which not only increases the running cost, but also the primary filter and the secondary filter. There was a problem in workability because it was necessary to separately discard the processed sludge discharged in.

【００１０】そこで、本発明は、放電加工における加工
条件に応じて、最適な電導度に調整された加工液を加工
間隙に迅速に供給し、電導度を調整するためのイオン交
換樹脂の無駄な消耗を抑制できる放電加工装置の提供を
課題とするものである。また、本発明は、大量に発生す
る加工スラジの処理にかかる費用及び時間を低減できる
放電加工装置の提供を課題とするものである。Therefore, according to the present invention, the machining fluid adjusted to have the optimum electric conductivity is rapidly supplied to the machining gap according to the machining conditions in the electric discharge machining, and the ion exchange resin for adjusting the electric conductivity is not wasted. An object of the present invention is to provide an electric discharge machine capable of suppressing wear. Another object of the present invention is to provide an electric discharge machining apparatus that can reduce the cost and time required for processing a large amount of machining sludge.

【００１１】[0011]

【課題を解決するための手段】請求項１の発明にかかる
放電加工装置は、電極と被加工物で形成される加工間隙
を含み、水もしくは水を主体とした加工液を溜めて放電
加工が行なわれる加工槽と、前記加工間隙で放電加工に
使用されて汚濁した加工液を受入れる第１タンクと、前
記第１タンク内の加工液を濾過するフィルタと、前記フ
ィルタによって濾過された加工液を受入れる第２タンク
と、前記第１タンク内の加工液と第２タンク内の加工液
が混合した加工液を受入れる第３タンクと、前記第３タ
ンク内の加工液を前記加工槽に供給する第１供給路と、
前記第２タンク内の加工液を前記加工間隙に供給する第
２供給路と、前記第２タンク内の加工液を脱イオン化す
るイオン交換手段と、前記脱イオン化された加工液を前
記加工間隙に供給する第３供給路と、前記脱イオン化さ
れた加工液を前記第２タンクに戻す返還路と、荒加工時
に前記第２タンク内の加工液の電導度が設定されたレベ
ル以上になったとき、及び設定されたレベル以下にある
ときに信号を出力する第１電導度判別手段と、前記第１
電導度判別手段の出力信号及び加工条件に応じて前記第
２タンク内の加工液の供給路を選択する制御手段と、前
記イオン交換手段で脱イオン化された加工液の電導度が
設定されたレベル以上に上昇したときに信号を出力する
第２電導度判別手段と、前記第２電導度判別手段の出力
信号によって加工液の電導度が設定されたレベル以上に
なったことを報知する表示手段とを具備するものであ
る。According to a first aspect of the present invention, there is provided an electric discharge machining apparatus, which includes a machining gap formed by an electrode and a workpiece, and discharges water or a machining liquid mainly containing water. A machining tank to be performed, a first tank for receiving the contaminated machining fluid used for electric discharge machining in the machining gap, a filter for filtering the machining fluid in the first tank, and a machining fluid filtered by the filter. A second tank for receiving, a third tank for receiving a working fluid in which the working fluid in the first tank and the working fluid in the second tank are mixed, and a third tank for feeding the working fluid in the third tank to the working tank 1 supply path,
A second supply path for supplying the machining liquid in the second tank to the machining gap, an ion exchange unit for deionizing the machining liquid in the second tank, and the deionized machining liquid to the machining gap. A third supply path for supplying, a return path for returning the deionized working fluid to the second tank, and an electric conductivity of the working fluid in the second tank at a set level or more during rough machining. , And a first conductivity discriminating means for outputting a signal when the level is less than or equal to a set level;
Control means for selecting a supply path of the working fluid in the second tank according to the output signal of the conductivity determining means and the working condition, and a level at which the conductivity of the working fluid deionized by the ion exchange means is set. Second conductivity determining means for outputting a signal when the temperature rises above, and display means for notifying that the conductivity of the working fluid has become equal to or higher than a set level by the output signal of the second conductivity determining means. It is equipped with.

【００１２】請求項２の発明にかかる放電加工装置は、
電極と被加工物で形成される加工間隙を含み、水もしく
は水を主体とした加工液を溜めて放電加工が行なわれる
加工槽と、前記加工間隙で放電加工に使用されて汚濁し
た加工液を受入れる第１タンクと、前記第１タンク内の
加工液を濾過するフィルタと、前記フィルタによって濾
過された加工液５を受入れる第２タンクと、前記第１タ
ンク内の加工液と第２タンク内の加工液が混合した加工
液を受入れる第３タンクと、前記第３タンク内の加工液
を前記加工槽に供給する第１供給路と、前記第２タンク
内の加工液を前記加工間隙に供給する第２供給路と、前
記第２タンク内の加工液を脱イオン化する並列に配設さ
れたイオン交換手段と、前記イオン交換手段の一方で脱
イオン化された加工液を前記加工間隙に供給する第３供
給路と、前記脱イオン化された加工液を前記第２タンク
に戻す返還路と、荒加工時に前記第２タンク内の加工液
の電導度が設定されたレベル以上になったとき、及び設
定されたレベル以下にあるときに信号を出力する第１電
導度判別手段と、前記イオン交換手段で脱イオン化され
た加工液の電導度が設定されたレベル以上に上昇したと
きに信号を出力する第２電導度判別手段と、前記第１電
導度判別手段の出力信号及び加工条件に応じて前記第２
タンク内の加工液の供給路を選択するとともに、前記第
２電導度判別手段の出力信号によって前記加工液が供給
されていた一方のイオン交換手段からもう一方のイオン
交換手段へ加工液の供給を変更する制御手段とを具備す
るものである。The electric discharge machine according to the invention of claim 2 is
A machining tank containing a machining gap formed by the electrode and the work piece, in which water or water-based machining fluid is stored for electrical discharge machining, and a machining fluid contaminated by electrical discharge machining in the machining gap A first tank for receiving, a filter for filtering the working fluid in the first tank, a second tank for receiving the working fluid 5 filtered by the filter, a working fluid in the first tank and a second tank A third tank for receiving the working fluid mixed with the working fluid, a first supply path for feeding the working fluid in the third tank to the working tank, and a working fluid in the second tank for feeding the working gap. A second supply path, an ion exchange means arranged in parallel for deionizing the working fluid in the second tank, and one of the ion exchange means for feeding the deionized working fluid to the working gap 3 supply path and the removal A return path for returning the processed fluid to the second tank, and when the electrical conductivity of the processing fluid in the second tank is at or above a set level during rough processing, and is below the set level. And a second conductivity determining means for outputting a signal, and a second conductivity determining means for outputting a signal when the conductivity of the working fluid deionized by the ion exchange means rises above a set level. The second signal according to the output signal of the first electrical conductivity determination means and the processing condition.
The machining fluid supply path in the tank is selected, and the machining fluid is supplied from one ion exchange means to which the machining fluid is being supplied to the other ion exchange means by the output signal of the second electric conductivity determination means. And control means for changing.

【００１３】請求項３の発明にかかる放電加工装置は、
電極と被加工物で形成される加工間隙を含み、水もしく
は水を主体とした加工液を溜めて放電加工が行なわれる
加工槽と、前記加工間隙で放電加工に使用されて汚濁し
た加工液を受入れる第１タンクと、前記第１タンク内に
配設され、底部が傾斜した第４タンクと、前記第４タン
クの最深部に連結されたマグネット式の一次フィルタ
と、前記第１タンク内の加工液を濾過する二次フィルタ
と、前記一次フィルタ及び二次フィルタで濾過された加
工スラッジを収納し、加工液と加工スラッジとを分離す
る三次フィルタと、前記一次フィルタ及び二次フィルタ
に付着した加工スラッジを前記三次フィルタへ供給する
供給手段と、前記二次フィルタで濾過された加工液を受
入れる第２タンクと、前記第１タンク内の加工液と第２
タンク内の加工液が混合した加工液を受入れる第３タン
クと、前記第３タンク内の加工液を前記加工槽に供給す
る第１供給路と、前記第２タンク内の加工液を前記加工
間隙に供給する第２供給路と、前記第２タンク内の加工
液を脱イオン化するイオン交換手段と、前記イオン交換
手段で脱イオン化された加工液を前記加工間隙に供給す
る第３供給路と、前記イオン交換手段で脱イオン化され
た加工液を前記第２タンクに戻す返還路と、荒加工時に
前記第２タンク内の加工液の電導度が設定されたレベル
以上になったとき、及び設定されたレベル以下にあると
きに信号を出力する第１電導度判別手段と、前記第１電
導度判別手段の出力信号及び加工条件に応じて前記第２
タンク内の加工液の供給路を選択する制御手段と、前記
イオン交換手段で脱イオン化された加工液の電導度が設
定されたレベル以上に上昇したときに信号を出力する第
２電導度判別手段と、前記第２電導度判別手段の出力信
号によって加工液の電導度が設定されたレベル以上にな
ったことを報知する表示手段とを具備するものである。The electric discharge machine according to the invention of claim 3 is
A machining tank containing a machining gap formed by the electrode and the work piece, in which water or water-based machining fluid is stored for electrical discharge machining, and a machining fluid contaminated by electrical discharge machining in the machining gap A first tank for receiving, a fourth tank disposed in the first tank and having an inclined bottom, a magnetic primary filter connected to the deepest part of the fourth tank, and processing in the first tank A secondary filter for filtering the liquid, a tertiary filter that stores the processed sludge filtered by the primary filter and the secondary filter, separates the processing liquid and the processed sludge, and the processing attached to the primary filter and the secondary filter Supply means for supplying sludge to the tertiary filter, a second tank for receiving the working fluid filtered by the secondary filter, a working fluid in the first tank, and a second tank.
A third tank for receiving the working fluid mixed with the working fluid in the tank, a first supply path for supplying the working fluid in the third tank to the working tank, and a working gap for working fluid in the second tank. A second supply path for supplying the machining fluid in the second tank, an ion exchange means for deionizing the machining fluid in the second tank, and a third supply path for supplying the machining fluid deionized by the ion exchange means to the machining gap. A return path for returning the working fluid deionized by the ion exchange means to the second tank, and when the electric conductivity of the working fluid in the second tank becomes equal to or higher than a set level during rough working, and The first conductivity determining means for outputting a signal when the level is below the predetermined level, and the second signal depending on the output signal of the first conductivity determining means and the processing condition.
Control means for selecting a working fluid supply path in the tank, and second conductivity determining means for outputting a signal when the conductivity of the working fluid deionized by the ion exchange means rises above a set level. And a display means for notifying that the electric conductivity of the working fluid has become equal to or higher than a set level by the output signal of the second electric conductivity judging means.

【００１４】[0014]

【作用】請求項１の発明の放電加工装置においては、加
工条件によって必要な電導度に調整された加工液を電極
と被加工物で形成される加工間隙に供給できるように供
給路を設け、加工条件及び必要な電導度を判別する電導
度判別手段からの信号によって供給路を適宜選択するも
のであるから、加工に応じた電導度の最適な加工液が加
工間隙に迅速に供給でき、これにより荒加工から仕上加
工までの加工が迅速に行なわれ、イオン交換樹脂の無駄
な消耗を避けることができる。In the electric discharge machining apparatus according to the first aspect of the present invention, a supply passage is provided so that the machining liquid adjusted to have a required electric conductivity depending on machining conditions can be supplied to the machining gap formed by the electrode and the workpiece. Since the supply path is appropriately selected according to the signal from the conductivity determining means for determining the processing condition and the required conductivity, the optimum working fluid of the conductivity according to the processing can be rapidly supplied to the processing gap. Thus, the processing from roughing to finishing can be performed quickly, and wasteful consumption of the ion exchange resin can be avoided.

【００１５】請求項２の発明の放電加工装置において
は、電極と被加工物で形成される加工間隙に加工液を供
給する供給路に、加工液を脱イオン化するイオン交換手
段を並列に設け、加工液のイオン交換には一方のイオン
交換手段のみ働かせ、このイオン交換手段の脱イオン化
性能が低下した場合には、もう一方のイオン交換手段に
切換えて加工液のイオン交換を行なうものであるから、
寿命になったイオン交換樹脂の交換作業のために加工を
中断する必要がない。In the electric discharge machining apparatus according to the second aspect of the present invention, ion-exchange means for deionizing the machining liquid is provided in parallel in the supply path for supplying the machining liquid to the machining gap formed by the electrode and the workpiece. Only one of the ion exchange means works for ion exchange of the working fluid, and when the deionization performance of this ion exchange means deteriorates, the ion exchange of the working fluid is carried out by switching to the other ion exchange means. ,
There is no need to interrupt the processing for the replacement work of the ion exchange resin that has reached the end of its life.

【００１６】請求項３の発明の放電加工装置において
は、放電加工によって発生した加工スラッジを一次フィ
ルタから三次フィルタに分けて加工液から除去するもの
であるから、各フィルタにかかる負担は軽くなり、且つ
二次フィルタは珪素土によるプリコート等をする必要が
なく、フィルタエレメントが加工スラッジで目詰まりし
てもフィルタエレメントと加工スラッジの分離ができ、
しかも、一次フィルタと二次フィルタで除去された加工
スラッジは最終的に三次フィルタに集められる。In the electric discharge machining apparatus according to the third aspect of the present invention, since the machining sludge generated by the electric discharge machining is divided into the primary filter and the tertiary filter and removed from the machining fluid, the load on each filter is lightened. Moreover, the secondary filter does not need to be pre-coated with silicon earth, and the filter element and the processed sludge can be separated even if the filter element is clogged with the processed sludge.
Moreover, the processed sludge removed by the primary filter and the secondary filter is finally collected by the tertiary filter.

【００１７】[0017]

【実施例】以下、本発明の各実施例について説明をす
る。 〈第一実施例〉図１は本発明の第一実施例である放電加
工装置の全体構成を示す説明図である。図において、１
は電極、２は被加工物、３は被加工物２が載置される定
盤、４は電極１と被加工物２で形成される加工間隙を含
み、加工液５を溜めて放電加工が行なわれる加工槽、６
は電極１と被加工物２で形成される加工間隙で放電加工
が行われるとき発生する加工スラッジ、７は加工槽４か
ら加工スラッジ６を含んだ加工液５を受入れるための第
１タンク、８は第１タンク７内の加工液５を濾過した後
に受入れるための第２タンク、９は第１タンク７と第２
タンク８との間に位置し、第１タンク７内の加工液５と
第２タンク８内の加工液５が混合した加工液５を受入れ
る第３タンク、１０〜１３は加工液５を強制的に流すポ
ンプ、１４は前記第１タンク７内の加工液５を濾過する
フィルタである。１５は第２タンク８内の加工液５の電
導度を検出し、設定レベル以上になると信号を出力する
第１電導度判別手段、１６は加工間隙に供給される加工
液５の電導度を検出し、設定されたレベル以上になると
信号を出力する第２電導度判別手段、１７ａ，１７ｂは
第２タンク８内の加工液５をイオン交換樹脂によって脱
イオン化するイオン交換手段、１８は荒加工から仕上加
工までの加工に応じて加工条件を設定する加工条件設定
手段、１９は第１電導度判別手段１５、第２電導度判別
手段１６、及び加工条件設定手段１８からの信号を受け
て、加工液５の供給路を適宜選択する制御手段である。
２０ａ〜２０ｇは制御手段１９からの信号により開閉す
る電磁弁等の制御弁、２１〜２７ｂは各々加工液５が流
れる管路であり、２１は第３タンク９内の加工液５を加
工槽４へ供給する管路、２２は第２タンク８内の加工液
５を加工間隙へ供給する管路、２３ａ，２３ｂはイオン
交換手段１７ａ，あるいはイオン交換手段１７ｂで電導
度を低下させた加工液５を流す管路、２４は電導度を低
下させた加工液５を管路２３ａ、あるいは管路２３ｂを
通って第２タンク８へ戻す管路、２５は管路２２，２３
ａ，２３ｂに接続されて加工液５を加工間隙へ供給する
管路、２６は加工槽４から加工液５を第１タンク７に供
給する管路、２７ａは第１タンク７とフィルタ１４とを
接続する管路、２７ｂはフィルタ１４と第２タンク８と
を接続する管路である。２８ａ〜２８ｄは加工液５の逆
流を防止する逆止弁、２９は第２電導度判別手段１６か
ら出力された信号を受けて、イオン交換手段１７ａ，１
７ｂ内のイオン交換樹脂の寿命を報知する表示手段であ
る。なお、上記の各制御弁２０ａ〜２０ｇの開閉動作、
及びポンプ１０〜１３の運転、停止動作は制御手段１９
からの信号によって制御され、これらの制御状態に応じ
て加工液５は管路２１〜２７ｂを流れる。Embodiments of the present invention will be described below. <First Embodiment> FIG. 1 is an explanatory view showing the overall configuration of an electric discharge machine which is a first embodiment of the present invention. In the figure, 1
Is an electrode, 2 is a work piece, 3 is a surface plate on which the work piece 2 is placed, 4 includes a machining gap formed by the electrode 1 and the work piece 2, and the machining fluid 5 is stored to perform electric discharge machining. Processing tank to be performed, 6
Is a machining sludge generated when electric discharge machining is performed in the machining gap formed by the electrode 1 and the workpiece 2, 7 is a first tank for receiving the machining fluid 5 containing the machining sludge 6 from the machining tank 4, 8 Is a second tank for receiving the processing liquid 5 in the first tank 7 after filtering, and 9 is the first tank 7 and the second tank.
The third tank, which is located between the tank 8 and receives the working fluid 5 in which the working fluid 5 in the first tank 7 and the working fluid 5 in the second tank 8 are mixed, 10 to 13 force the working fluid 5 And 14 is a filter for filtering the working fluid 5 in the first tank 7. Reference numeral 15 is a first electric conductivity determining means for detecting the electric conductivity of the working liquid 5 in the second tank 8 and outputting a signal when the working liquid is above a set level, and 16 is the electric conductivity of the working liquid 5 supplied to the working gap. Then, the second conductivity determining means for outputting a signal when the level becomes equal to or higher than the set level, 17a and 17b are ion exchange means for deionizing the working fluid 5 in the second tank 8 with the ion exchange resin, and 18 is for rough processing. Machining condition setting means for setting machining conditions according to machining up to finish machining, 19 receives signals from the first conductivity determining means 15, the second conductivity determining means 16, and the machining condition setting means 18, and performs machining. It is a control means for appropriately selecting the supply path of the liquid 5.
Reference numerals 20a to 20g are control valves such as electromagnetic valves that are opened and closed by a signal from the control means 19, 21 to 27b are pipes through which the working fluid 5 flows, respectively, and 21 is the working tank 4 for the working fluid 5 in the third tank 9. For supplying the machining fluid 5 in the second tank 8 to the machining gap, and 23a, 23b for the ion-exchange means 17a or the ion-exchange means 17b for reducing the electrical conductivity of the machining fluid 5. , 24 is a conduit for returning the working fluid 5 whose electrical conductivity has been reduced to the second tank 8 through the conduit 23a or the conduit 23b, and 25 is a conduit 22, 23.
a, which is connected to a and 23b and supplies the working liquid 5 to the working gap, 26 is a conduit which feeds the working liquid 5 from the working tank 4 to the first tank 7, and 27a is the first tank 7 and the filter 14. The connecting pipe line 27b is a pipe line connecting the filter 14 and the second tank 8. Reference numerals 28a to 28d are check valves for preventing backflow of the working fluid 5, and 29 is a signal output from the second conductivity determining means 16 to receive ion exchange means 17a, 1a.
It is a display means for notifying the life of the ion exchange resin in 7b. In addition, the opening / closing operation of each of the control valves 20a to 20g,
The operation of the pumps 10 to 13 and the stop operation are performed by the control means 19
Is controlled by a signal from the machining fluid, and the machining fluid 5 flows through the pipe lines 21 to 27b according to these control states.

【００１８】次に、上記構成の放電加工装置の動作につ
いて説明する。加工槽４内の所定の位置に電極１と被加
工物２をセッティングし、荒加工条件を設定すると、加
工条件設定手段１８から出力される信号を受けて、制御
弁２０ｂ〜２０ｅを閉じ、ポンプ１２を運転させるよう
に制御手段１９から信号が出力される。その後、第２タ
ンク９内の加工液５をポンプ１０で汲上げ、管路２１か
ら制御弁２０ａを介して加工槽４へ供給し、加工槽４内
に加工液５を充満させる。加工液充満完了後、加工を開
始すると第２タンク８内の加工液５をポンプ１２で汲上
げ、管路２２，２５から制御弁２０ｆを介して加工間隙
に供給する。この管路２５の途中にある制御弁２０ｆは
加工間隙に供給する加工液５の液圧を設定するための弁
である。加工間隙に供給された加工液５は放電加工によ
って発生した加工スラッジ６を含んで、加工間隙から排
出される。そして、加工スラッジ６を含んだ加工液５は
制御弁２０ｇを介して管路２６から第１タンク７へ戻さ
れる。第１タンク７内の加工液５はポンプ１１により管
路２７ａを通りフィルタ１４へ供給され、加工スラッジ
６を除去して管路２７ｂから第２タンク８へ戻される。Next, the operation of the electric discharge machine having the above construction will be described. When the electrode 1 and the workpiece 2 are set at predetermined positions in the processing tank 4 and rough processing conditions are set, the control valves 20b to 20e are closed by receiving a signal output from the processing condition setting means 18 and the pump A signal is output from the control means 19 so as to drive the motor 12. After that, the working liquid 5 in the second tank 9 is pumped up by the pump 10 and supplied from the pipe line 21 to the working tank 4 through the control valve 20a to fill the working tank 4 with the working liquid 5. When the processing is started after the completion of the processing liquid filling, the processing liquid 5 in the second tank 8 is pumped up by the pump 12 and supplied from the pipe lines 22 and 25 to the processing gap via the control valve 20f. The control valve 20f located in the middle of the pipe line 25 is a valve for setting the hydraulic pressure of the machining liquid 5 supplied to the machining gap. The machining liquid 5 supplied to the machining gap contains the machining sludge 6 generated by electric discharge machining and is discharged from the machining gap. Then, the working liquid 5 containing the working sludge 6 is returned from the pipe line 26 to the first tank 7 via the control valve 20g. The working liquid 5 in the first tank 7 is supplied to the filter 14 through the pipe 27a by the pump 11, the processing sludge 6 is removed, and the working liquid 5 is returned from the pipe 27b to the second tank 8.

【００１９】しかし、放電加工が進むにつれて、加工ス
ラッジ６の一部がイオン化したものの濃度が次第に増加
し、加工液５の電導度が上昇する。そのために、第２タ
ンク８内の加工液５の電導度が設定した電導度以上にな
ったとき、第１電導度判別手段１５が信号を制御手段１
９へ出力し、制御手段１９はその信号を受けて、制御弁
２０ｂ，２０ｃを開き、ポンプ１３を運転させるように
信号を出力する。これにより、第２タンク８内の加工液
５はポンプ１３によって汲上げられ、制御弁２０ｃを介
してイオン交換手段１７ａへ供給される。イオン交換手
段１７ａへ供給された加工液５はイオン交換手段１７ａ
内のイオン交換樹脂によりイオンが取除かれ、管路２３
ａ，２４から制御弁２０ｂを介して第２タンク８へ戻さ
れる。このイオン交換手段１７ａによるイオン除去速度
がイオン発生速度よりも大きければ、この加工液循環を
続けることにより加工液５の電導度は、その後第１電導
度判別手段１５の設定したレベル以下となり、第１電導
度判別手段１５から設定したレベル以下になったことを
知らせる信号を制御手段１９へ出力する。この信号を受
けて制御手段１９は、制御弁２０ｂ，２０ｃを閉じ、ポ
ンプ１３を停止させ、上記の加工液循環動作を停止す
る。こうして、イオン交換手段１７ａ，１７ｂが使用さ
れる状態を制限する。However, as the electric discharge machining progresses, the concentration of the ionized part of the machining sludge 6 gradually increases, and the electric conductivity of the machining liquid 5 increases. Therefore, when the electric conductivity of the working fluid 5 in the second tank 8 becomes equal to or higher than the set electric conductivity, the first electric conductivity determining means 15 outputs a signal to the control means 1.
9, the control means 19 receives the signal, opens the control valves 20b and 20c, and outputs a signal to operate the pump 13. As a result, the working liquid 5 in the second tank 8 is pumped up by the pump 13 and supplied to the ion exchange means 17a via the control valve 20c. The machining fluid 5 supplied to the ion exchange means 17a is the ion exchange means 17a.
Ions are removed by the ion exchange resin in the pipe 23
It is returned to the 2nd tank 8 from a, 24 via the control valve 20b. If the ion removal rate by the ion exchange means 17a is higher than the ion generation rate, the electrical conductivity of the working fluid 5 becomes equal to or lower than the level set by the first electrical conductivity discriminating means 15 by continuing the circulation of the working fluid. A signal notifying that the level has become equal to or lower than the level set by the 1-conductivity determination means 15 is output to the control means 19. In response to this signal, the control means 19 closes the control valves 20b and 20c, stops the pump 13, and stops the above-mentioned machining liquid circulation operation. Thus, the state in which the ion exchange means 17a, 17b is used is limited.

【００２０】また、イオン交換手段１７ａ内のイオン交
換樹脂は加工液５の電導度を低下させるために使用され
ると次第に消耗が進むので、管路２３ａを通ってきた加
工液５でも電導度が第２電導度判別手段１６で設定した
レベル以上になるときがくる。そのとき、第２電導判別
手段１６が設定レベル以上の電導度を検出すると、制御
手段１９へ信号を出力し、制御手段１９は制御弁２０ｃ
を閉じ、制御弁２０ｄを開いて、ポンプ１３によって汲
上げられた加工液５をイオン交換手段１７ａから他のイ
オン交換手段１７ｂに変更して供給する。そして、イオ
ン交換手段１７ｂから管路２３ｂを通ってきた加工液５
の電導度が第２電導判別手段１６の設定したレベル以下
であれば、そのまま管路２４を通り、制御弁２０ｂを介
して第２タンク８に戻され、第２タンク８内の加工液５
の電導度が第１電導度判別手段１５の設定したレベル以
下になるまで上記加工液循環が続けられる。この際、第
２電導度判別手段１６からの信号は表示手段２９にも出
力され、この信号を受取った表示手段１９はイオン交換
手段１７ａ内のイオン交換樹脂に寿命がきたことを表示
する。したがって、作業オペレータはこの表示を見て、
イオン交換手段１７ｂ内のイオン交換樹脂が加工液５の
電導度を低下させるのに使用されている間に、イオン交
換手段１７ａ内のイオン交換樹脂を新品に取換えること
ができる。Further, the ion exchange resin in the ion exchange means 17a is gradually consumed when it is used to reduce the electric conductivity of the working liquid 5, so that the electric conductivity of the working liquid 5 passing through the pipe line 23a also increases. There is a time when the level becomes equal to or higher than the level set by the second electric conductivity determining means 16. At that time, when the second electric conduction determining means 16 detects the electric conductivity above the set level, it outputs a signal to the control means 19, and the control means 19 controls the control valve 20c.
Is closed, the control valve 20d is opened, and the working fluid 5 pumped up by the pump 13 is changed from the ion exchange means 17a to another ion exchange means 17b and supplied. Then, the working fluid 5 that has passed from the ion exchange means 17b through the pipe line 23b.
If the electric conductivity of is less than or equal to the level set by the second electric conduction determining means 16, it is returned to the second tank 8 through the conduit 24 and the control valve 20b, and the machining liquid 5 in the second tank 8 is returned.
The machining fluid circulation is continued until the electric conductivity of 1 is below the level set by the first electric conductivity determining means 15. At this time, the signal from the second conductivity determination means 16 is also output to the display means 29, and the display means 19 receiving this signal indicates that the ion exchange resin in the ion exchange means 17a has reached the end of its life. Therefore, the operator sees this display and
While the ion exchange resin in the ion exchange means 17b is being used to reduce the conductivity of the working fluid 5, the ion exchange resin in the ion exchange means 17a can be replaced with a new one.

【００２１】なお、荒加工中は、加工間隙に供給される
加工液５の電導度の上昇が加工に与える影響が少ないの
で、第２タンク８内の加工液５の電導度が所望の電導度
になるまで上記のような加工液５の循環を続けて、第２
タンク８内の加工液５を管路２２，２５を通して加工間
隙に供給し、荒加工を続けることができる。During the rough machining, the increase in the electric conductivity of the machining liquid 5 supplied to the machining gap has little influence on the machining, so that the electric conductivity of the machining liquid 5 in the second tank 8 is the desired conductivity. Continue to circulate the machining fluid 5 as described above until
The machining liquid 5 in the tank 8 can be supplied to the machining gap through the conduits 22 and 25 to continue rough machining.

【００２２】また、荒加工終了後、仕上加工に移ったと
きは、加工条件設定手段１８から制御手段１９へ信号が
出力され、制御手段１９は制御弁２０ｃ，２０ｅを開
き、ポンプ１２の運転を停止させ、ポンプ１３を運転さ
せるように信号を出力する。この信号を受けて、ポンプ
１３を用いて汲上げられた第２タンク８内の加工液５
は、イオン交換手段１７ａに制御弁２０ｃを介して供給
され、イオン交換手段１７ａによって脱イオン化し電導
度を低下させた加工液５は管路２３ａ，２５を通って、
直接加工間隙に供給され、仕上加工が進行する。このと
き、加工間隙に供給される加工液５の電導度は、電極１
と被加工物２の対向面積にもよるが、１μＳ／ｃｍ以下
であればよい。加工間隙に供給された加工液５は放電加
工によって発生した加工スラッジ６を含んで、加工間隙
から排出される。そして、加工スラッジ６を含んだ加工
液５は制御弁２０ｇを介して管路２６から第１タンク７
へ戻される。第１タンク７内の加工液５はポンプ１１に
より管路２７を通してフィルタ１４へ供給され、加工ス
ラッジ６を除去し、第２タンク８へ戻される。After finishing the rough machining, when finishing machining is started, a signal is output from the machining condition setting means 18 to the control means 19, and the control means 19 opens the control valves 20c and 20e to operate the pump 12. A signal is output so as to stop and operate the pump 13. In response to this signal, the working fluid 5 in the second tank 8 pumped up by the pump 13
Is supplied to the ion exchange means 17a through the control valve 20c, and the machining fluid 5 deionized by the ion exchange means 17a to lower the conductivity passes through the pipes 23a and 25,
It is directly supplied to the machining gap and the finishing process proceeds. At this time, the conductivity of the working liquid 5 supplied to the working gap is equal to that of the electrode 1
And 1 μS / cm or less, although it depends on the facing area of the workpiece 2. The machining liquid 5 supplied to the machining gap contains the machining sludge 6 generated by electric discharge machining and is discharged from the machining gap. Then, the processing liquid 5 containing the processing sludge 6 is passed through the control valve 20g from the pipe 26 to the first tank 7
Returned to. The working liquid 5 in the first tank 7 is supplied to the filter 14 by the pump 11 through the pipe 27, removes the working sludge 6, and is returned to the second tank 8.

【００２３】しかし、先に説明したように、イオン交換
手段１７ａ内のイオン交換樹脂は加工液５の電導度を低
下させるために使用されていると次第に消耗が進み、管
路２３ａを通ってきた加工液５でもその電導度が第２電
導度判別手段１６の設定したレベル以上になるときがく
る。そのときには、第２電導度判別手段１６から信号が
制御手段１９へ出力され、その信号を受け取った制御手
段１９は制御弁２０ｃを閉じ、制御弁２０ｄを開くよう
に信号を出力し、加工間隙に供給される加工液５はもう
一方のイオン交換手段１７ｂに供給される。イオン交換
手段１７ｂから管路２３ｂを通ってきた加工液５の電導
度が第２電導度判別手段１６の設定レベル以下であれ
ば、そのまま制御弁２０ｅを介して管路２５を通り、加
工間隙に供給される。この際、第２電導度判別手段１６
からの信号は表示手段２９にも出力され、信号を受取っ
た表示手段２９はイオン交換手段１７ａ内のイオン交換
樹脂に寿命がきたことを表示する。したがって、作業オ
ペレータはこの表示を見て、イオン交換手段１７ｂ内の
イオン交換樹脂が加工液５の電導度を低下させるのに使
用されている間に、イオン交換手段１７ａ内のイオン交
換樹脂を新品と取換えることができる。However, as described above, if the ion exchange resin in the ion exchange means 17a is used to reduce the electric conductivity of the working fluid 5, the ion exchange resin is gradually consumed and has passed through the pipe line 23a. There is a time when the electric conductivity of the working fluid 5 becomes equal to or higher than the level set by the second electric conductivity discriminating means 16. At that time, a signal is output from the second conductivity discriminating means 16 to the control means 19, and the control means 19 receiving the signal outputs a signal to close the control valve 20c and open the control valve 20d, and to the machining gap. The supplied processing liquid 5 is supplied to the other ion exchange means 17b. If the electric conductivity of the working fluid 5 that has passed from the ion exchange means 17b through the pipe 23b is equal to or lower than the set level of the second electric conductivity discriminating means 16, it will pass through the pipe 25 through the control valve 20e and enter the machining gap. Supplied. At this time, the second conductivity determining means 16
The signal from is also output to the display means 29, and the display means 29 having received the signal indicates that the ion exchange resin in the ion exchange means 17a has reached the end of its life. Therefore, the work operator sees this display and while the ion exchange resin in the ion exchange means 17b is being used to reduce the conductivity of the working fluid 5, the ion exchange resin in the ion exchange means 17a is brand new. Can be replaced with

【００２４】このように、本実施例の放電加工装置は、
電極１と被加工物２で形成される加工間隙を含み、水も
しくは水を主体とした加工液５を溜めて放電加工が行な
われる加工槽４と、前記加工間隙で放電加工に使用され
て汚濁した加工液５を制御弁２０ｇを介し管路２６を通
して受入れる第１タンク７と、前記第１タンク７内の加
工液５を管路２７ａを通してポンプ１１で汲上げて濾過
するフィルタ１４と、前記フィルタ１４によって濾過さ
れた加工液５を管路２７ｂを通して受入れる第２タンク
８と、前記第１タンク７と第２タンク８との間に位置
し、前記第１タンク７内の加工液５と第２タンク８内の
加工液５が混合した加工液５を受入れる第３タンク９
と、前記第３タンク９内の加工液５をポンプ１０で汲上
げ管路２１を通し制御弁２０ａを介して前記加工槽４に
供給する第１供給路と、前記第２タンク８内の加工液５
をポンプ１２で汲上げ管路２２，２５を通し制御弁２０
ｆを介して前記加工間隙に供給する第２供給路と、前記
第２タンク８内の加工液５を脱イオン化するイオン交換
手段１７ａ，１７ｂと、前記イオン交換手段１７ａ，１
７ｂのイオン交換樹脂によって脱イオン化された加工液
５を管路２３ａ，２３ｂから制御弁２０ｅを経て管路２
５を通し制御弁２０ｆを介して前記加工間隙に供給する
第３供給路と、前記イオン交換手段１７ａ，１７ｂのイ
オン交換樹脂によって脱イオン化された加工液５を管路
２３ａ，２３ｂ，２４を通し前記第２タンク８に戻す返
還路と、荒加工時に前記第２タンク８内の加工液５の電
導度が設定されたレベル以上になったとき、及び設定さ
れたレベル以下にあるときに所定の信号を制御手段１９
に出力する第１電導度判別手段１５と、前記第１電導度
判別手段１５の出力信号及び加工条件設定手段１８から
の加工条件に応じて前記第２タンク８内の加工液５の供
給路を選択する制御手段１９と、前記イオン交換手段１
７ａ，１７ｂによって脱イオン化された加工液５の電導
度が設定されたレベル以上に上昇したときに信号を制御
手段１９に出力する第２電導度判別手段１６と、前記第
２電導度判別手段１６の出力信号によって加工液５の電
導度が設定されたレベル以上になったことを報知する表
示手段２９とを備えている。As described above, the electric discharge machining apparatus of this embodiment is
A machining tank 4 including a machining gap formed by the electrode 1 and the workpiece 2 in which water or a machining liquid 5 mainly containing water is stored for electrical discharge machining, and a contamination used by electrical discharge machining in the machining gap. A first tank 7 for receiving the processed liquid 5 through a pipe 26 via a control valve 20g, a filter 14 for pumping the processed liquid 5 in the first tank 7 with a pump 11 through a pipe 27a, and the filter A second tank 8 for receiving the working fluid 5 filtered by the second passage 27b and a second tank 8 located between the first tank 7 and the second tank 8 and the second working fluid 5 in the first tank 7 and the second tank 8. Third tank 9 for receiving the working fluid 5 in which the working fluid 5 in the tank 8 is mixed
And a first supply path for supplying the processing liquid 5 in the third tank 9 to the processing tank 4 through the pumping line 21 by the pump 10 and the control valve 20a, and processing in the second tank 8. Liquid 5
Pump 12 through pumping lines 22 and 25 to control valve 20
a second supply path for supplying the machining gap via f, ion exchange means 17a, 17b for deionizing the machining liquid 5 in the second tank 8, and the ion exchange means 17a, 1
The working fluid 5 deionized by the ion-exchange resin 7b is supplied from the conduits 23a and 23b to the conduit 2 via the control valve 20e.
5 through the control valve 20f and the working fluid 5 deionized by the ion exchange resin of the ion exchange means 17a, 17b through the pipelines 23a, 23b, 24. A return path for returning to the second tank 8 and a predetermined value when the electric conductivity of the working fluid 5 in the second tank 8 becomes equal to or higher than a set level during rough processing, and when the electric conductivity is equal to or lower than the set level. Signal control means 19
The first conductivity determining means 15 for outputting to the first conductivity determining means 15 and the supply path of the working fluid 5 in the second tank 8 according to the output signal of the first conductivity determining means 15 and the processing condition from the processing condition setting means 18. Control means 19 for selecting and the ion exchange means 1
Second conductivity determining means 16 for outputting a signal to the control means 19 when the conductivity of the working fluid 5 deionized by 7a, 17b rises above a set level, and the second conductivity determining means 16 And a display means 29 for notifying that the electric conductivity of the working fluid 5 has become equal to or higher than the set level.

【００２５】即ち、本実施例の放電加工装置は、加工条
件によって必要な電導度に調整された加工液５を電極１
と被加工物２で形成される加工間隙に供給できるように
供給路を設け、加工条件及び必要な電導度を判別する電
導度判別手段からの信号によって供給路を適宜選択する
ものである。That is, in the electric discharge machining apparatus of this embodiment, the machining fluid 5 adjusted to have a required electric conductivity depending on machining conditions is used for the electrode 1.
A supply path is provided so that the supply path can be supplied to the machining gap formed by the workpiece 2, and the supply path is appropriately selected according to a signal from the electrical conductivity determining means for determining the processing condition and the required electrical conductivity.

【００２６】したがって、加工に応じた最適な電導度の
加工液が加工間隙に迅速に供給でき、これにより荒加工
から仕上加工までの加工が迅速に行なわれ、イオン交換
樹脂の無駄な消耗を避けることができる。このため、加
工条件の変更、あるいは加工液の電導度の上昇に応じ
て、加工液の電導度は自動的に調整され加工間隙に供給
されるので、作業性及び経済性が向上する。Therefore, the working fluid having the optimum electric conductivity according to the working can be quickly supplied to the working gap, whereby the working from the rough working to the finish working can be performed quickly, and the wasteful consumption of the ion exchange resin is avoided. be able to. Therefore, the electric conductivity of the working liquid is automatically adjusted and supplied to the working gap according to the change of the working condition or the increase of the electric conductivity of the working liquid, so that the workability and the economical efficiency are improved.

【００２７】しかも、本実施例の放電加工装置では、第
２タンク８内の加工液５を脱イオン化するイオン交換手
段１７ａ，１７ｂは並列に配設され、前記イオン交換手
段１７ａ，１７ｂの一方で加工液５を脱イオン化し、第
１電導度判別手段１５の出力信号及び加工条件に応じて
前記第２タンク８内の加工液５の供給路を選択して、第
２タンク８に戻したり加工間隙に供給するとともに、第
２電導度判別手段１６の出力信号によって前記加工液５
が供給されていた一方のイオン交換手段からもう一方の
イオン交換手段へ加工液５の供給を変更する。Moreover, in the electric discharge machining apparatus of this embodiment, the ion exchange means 17a, 17b for deionizing the machining fluid 5 in the second tank 8 are arranged in parallel, and one of the ion exchange means 17a, 17b is used. The working fluid 5 is deionized, and the supply path of the working fluid 5 in the second tank 8 is selected according to the output signal of the first electrical conductivity determination means 15 and the working conditions, and is returned to the second tank 8 or processed. The machining fluid 5 is supplied to the gap and is output by the second conductivity determining means 16 in response to the output signal.
The supply of the working fluid 5 is changed from one ion exchange means that was supplied to the other ion exchange means.

【００２８】即ち、本実施例の放電加工装置は、電極と
被加工物で形成される加工間隙に加工液を供給する供給
路に、加工液を脱イオン化するイオン交換手段を並列に
設けて、加工液のイオン交換には一方のイオン交換手段
のみ働かせ、このイオン交換手段の脱イオン化性能が低
下した場合には、もう一方のイオン交換手段に切換えて
加工液のイオン交換を行なうものである。That is, in the electric discharge machining apparatus of the present embodiment, an ion exchange means for deionizing the machining liquid is provided in parallel in the supply path for supplying the machining liquid to the machining gap formed by the electrode and the workpiece. For the ion exchange of the working fluid, only one of the ion exchange means works, and when the deionization performance of this ion exchange means deteriorates, the ion exchange of the working fluid is carried out by switching to the other ion exchange means.

【００２９】したがって、寿命になったイオン交換樹脂
の交換作業のために加工を中断する必要がないので、イ
オン交換樹脂の交換作業に要する時間は加工時間に影響
しない。Therefore, since it is not necessary to interrupt the processing for the replacement work of the ion exchange resin that has reached the end of its life, the time required for the replacement work of the ion exchange resin does not affect the processing time.

【００３０】〈第二実施例〉図２は本発明の第二実施例
である放電加工装置の要部構成を示す説明図であり、図
３は図２の二次フィルタの動作を示す斜視図である。図
中、第一実施例と同一符号及び記号は第一実施例の構成
部分と同一または相当する構成部分を示す。なお、図２
では図１で示した加工槽４、第２タンク８、第３タンク
９、及びその加工液５の循環系は省略されている。<Second Embodiment> FIG. 2 is an explanatory view showing the essential structure of an electric discharge machine according to a second embodiment of the present invention. FIG. 3 is a perspective view showing the operation of the secondary filter shown in FIG. Is. In the figure, the same reference numerals and symbols as those in the first embodiment denote the same or corresponding components as those of the first embodiment. Note that FIG.
In FIG. 1, the processing tank 4, the second tank 8, the third tank 9 and the circulation system for the processing liquid 5 shown in FIG. 1 are omitted.

【００３１】図２において、５０は第１タンク７内に配
設され、加工スラッジ６を含んだ加工液５を受取る第４
タンクであり、この第４タンク５０の底部は傾斜してい
る。５１は第４タンク５０の最新部に連結されたマグネ
ット式フィルタからなる一次フィルタであり、１４ａは
マグネット式フィルタを一次フィルタ５１とすると、一
次フィルタ５１で除去できなかった加工スラッジ６を取
除く二次フィルタである。５２はモータ、５３は一次フ
ィルタ５１の内面に設けられたマグネット、５４はモー
タ５２によって回転するスクリュ、５５は第４タンク５
０と一次フィルタ５１とを連結する管路、５６は磁性体
加工スラッジが除去された加工液５を一次フィルタ５１
から第１タンク７へ排出する管路である。５７は一次フ
ィルタ５１と二次フィルタ１４ａで除去された加工スラ
ッジ６を収納し、加工液５と加工スラッジ６とを分離す
る三次フィルタ、５８は三次フィルタ５７に取付けられ
た濾紙、５９は加工スラッジ６が濾紙５８に溜った廃棄
用の加工スラッジである。６０は一次フィルタ５１から
三次フィルタ５７へ磁性体加工スラッジを排出するため
の管路、６１は二次フィルタ１４ａの底部に接続された
管路である。６５は二次フィルタ１４ａの下部、６６は
二次フィルタ１４ａの上部であり、６７は二次フィルタ
１４ａ内に装着されているフィルタエレメントである。
６８は二次フィルタ１４ａに加工液５を供給するときの
圧力が設定したレベル以上になると信号を出力する圧力
判別手段、６９は圧力判別手段６８からの信号を受けて
各制御弁８０ａ〜８０ｅの開閉を制御する制御手段、７
０ａ，７０ｂは二次フィルタ１４ａに加圧空気を供給す
る加圧空気源である。なお、その他の構成は上記第一実
施例で説明した図１と同様である。In FIG. 2, reference numeral 50 denotes a fourth tank which is arranged in the first tank 7 and receives the working liquid 5 containing the working sludge 6.
It is a tank, and the bottom of the fourth tank 50 is inclined. Reference numeral 51 is a primary filter composed of a magnet type filter connected to the latest portion of the fourth tank 50, and 14a is a secondary filter for removing the processed sludge 6 which cannot be removed by the primary filter 51 when the magnetic type filter is the primary filter 51. It is the next filter. 52 is a motor, 53 is a magnet provided on the inner surface of the primary filter 51, 54 is a screw rotated by the motor 52, and 55 is the fourth tank 5.
0 is a pipe line connecting the primary filter 51, and 56 is the primary filter 51 for supplying the working fluid 5 from which the magnetic material working sludge has been removed.
It is a pipe line for discharging from the first tank 7 to the first tank 7. 57 is a tertiary filter that stores the processed sludge 6 removed by the primary filter 51 and the secondary filter 14a and separates the processing liquid 5 and the processed sludge 6, 58 is a filter paper attached to the tertiary filter 57, and 59 is the processed sludge Reference numeral 6 is a processed sludge for disposal, which is accumulated on the filter paper 58. Reference numeral 60 is a conduit for discharging the magnetic material-processed sludge from the primary filter 51 to the tertiary filter 57, and 61 is a conduit connected to the bottom of the secondary filter 14a. Reference numeral 65 is a lower portion of the secondary filter 14a, 66 is an upper portion of the secondary filter 14a, and 67 is a filter element mounted in the secondary filter 14a.
Reference numeral 68 denotes a pressure discriminating means for outputting a signal when the pressure at which the working fluid 5 is supplied to the secondary filter 14a becomes equal to or higher than a set level, and 69 receives a signal from the pressure discriminating means 68 to control the control valves 80a-80e. Control means for controlling opening and closing, 7
Reference numerals 0a and 70b denote pressurized air sources for supplying pressurized air to the secondary filter 14a. The other structure is the same as that of FIG. 1 described in the first embodiment.

【００３２】次に、上記構成の放電加工装置の動作につ
いて説明する。加工中、加工間隙で発生した加工スラッ
ジ６を含む加工液５は管路２６を通り第１タンク７内に
設けられた第４タンク５０へ排出される。第４タンク５
０へ入った加工液５は管路５５から一次フィルタ５１の
マグネット式フィルタへ供給される。第４タンク５０の
底部は傾斜しており、管路５５は第４タンク５０の傾斜
した底部の最深部に連結されているので、第４タンク５
０へ入った加工液５の中に含まれる加工スラッジ６は第
４タンク５０の底部に沈澱することなく一次フィルタ５
１のマグネット式フィルタへ供給される。このマグネッ
ト式フィルタに入った加工液５に含まれる加工スラッジ
６のうち、磁性体加工スラッジはマグネット式フィルタ
の内面に設けられたマグネット５３の表面に一旦付着す
るが、スクリュー５４をモータ５２で回転させて、マグ
ネット式フィルタの内面上部へ移動させる。マグネット
式フィルタの内面上部に移動した磁性体加工スラッジは
管路６０の位置にきたところでマグネット式フィルタ内
面から離れ、管路６０を通って三次フィルタ５７へ排出
される。三次フィルタ５７は金網状の箱であり、その中
に袋状の濾紙５８が入れてある。Next, the operation of the electric discharge machine having the above configuration will be described. During processing, the processing liquid 5 containing the processing sludge 6 generated in the processing gap is discharged to the fourth tank 50 provided in the first tank 7 through the pipe line 26. 4th tank 5
The machining fluid 5 entering 0 is supplied from the pipe 55 to the magnet type filter of the primary filter 51. Since the bottom portion of the fourth tank 50 is inclined and the pipeline 55 is connected to the deepest portion of the inclined bottom portion of the fourth tank 50, the fourth tank 5
The processing sludge 6 contained in the processing liquid 5 that has entered into the first tank 5 does not settle on the bottom portion of the fourth tank 50.
No. 1 magnet type filter. Of the machining sludge 6 contained in the machining fluid 5 that has entered the magnet type filter, the magnetic substance machining sludge once adheres to the surface of the magnet 53 provided on the inner surface of the magnet type filter, but the screw 54 is rotated by the motor 52. Then, it is moved to the upper part of the inner surface of the magnet type filter. The magnetic material-processed sludge that has moved to the upper portion of the inner surface of the magnet type filter is separated from the inner surface of the magnet type filter when it reaches the position of the conduit 60, and is discharged to the tertiary filter 57 through the conduit 60. The tertiary filter 57 is a wire mesh box in which a bag-shaped filter paper 58 is placed.

【００３３】次に、磁性体加工スラッジが除去された加
工液５はマグネット式フィルタから管路５６を通って第
１タンク７に排出される。第１タンク７に排出された加
工液５はポンプ１１で汲上げられ、管路２７ａを通って
二次フィルタ１４ａへ供給される。二次フィルタ１４ａ
の下部６５に入った加工液５はフィルタエレメント６７
によって濾過され、加工液５に含まれる磁性体加工スラ
ッジ以外の加工スラッジ６はフィルタエレメント６７に
付着する。加工スラッジ６が除去された加工液５はフィ
ルタエレメント６７の内部を通って二次フィルタ１４ａ
の上部６６へ出る。このフィルタエレメト６７は図３に
示すような構造となっている。Next, the processing liquid 5 from which the magnetic material processing sludge has been removed is discharged from the magnet type filter to the first tank 7 through the pipe line 56. The machining liquid 5 discharged to the first tank 7 is pumped up by the pump 11 and supplied to the secondary filter 14a through the pipe line 27a. Secondary filter 14a
The machining fluid 5 that has entered the lower part 65 of the filter element 67
The process sludge 6 other than the magnetic substance process sludge contained in the process fluid 5 is filtered and is attached to the filter element 67. The processing liquid 5 from which the processing sludge 6 has been removed passes through the inside of the filter element 67 and the secondary filter 14a.
Exit to the upper part 66. This filter element 67 has a structure as shown in FIG.

【００３４】図３は図２の二次フィルタの動作を示す斜
視図である。図３において、１００は積層ペーパフィル
タであり、１０１は加工スラッジを含んだ加工液、１０
２は加工スラッジが除去された加工液である。つまり、
二次フィルタ１４ａのフィルタエレメント６７はペーパ
ーウェハーを積層したものであり、その濾過精度は１μ
である。FIG. 3 is a perspective view showing the operation of the secondary filter of FIG. In FIG. 3, 100 is a laminated paper filter, 101 is a working fluid containing working sludge, and 10
2 is a working liquid from which the working sludge has been removed. That is,
The filter element 67 of the secondary filter 14a is a stack of paper wafers, and its filtering accuracy is 1 μm.
Is.

【００３５】二次フィルタ１４ａの上部６６に出た加工
スラッジ６が除去された加工液５は、制御弁８０ａを介
して管路２７ｂを通って第２タンク８へ供給される。し
かし、二次フィルタ１４ａで濾過を続けていくとフィル
タエレメント６７は加工スラッジ６によって目詰まり状
態になり、第２タンク８へ供給される加工スラッジ６が
除去された加工液５の濾過流量が次第に減ってくる。ま
た、フィルタエレメント６７が目詰り状態になると、ポ
ンプ１１により二次フィルタ１４ａへ供給される加工液
５の供給圧力も上昇する。そこで、上記濾過流量の減少
が問題にならない程度のときの上記供給圧力を設定レベ
ルとした圧力判別手段６８を管路２７ａの途中に設け
て、供給圧力が設定されたレベル以上になったときに、
圧力判別手段６８から制御手段６９へ信号を出力する。
信号を受け取った制御手段６９はポンプ１１の運転を停
止させ、制御弁８０ａを閉じ、制御弁８０ｂ，８０ｃを
開く。これにより、加圧空気源７０ａから圧縮空気が制
御弁８０ｂを介して二次フィルタ１４ａの下部６５に供
給され、二次フィルタ１４ａの下部６５に溜まっていた
加工液５は管路６１を通って制御弁８０ｃを介して第１
タンク７へ排出される。そして、二次フィルタ１４ａの
下部６５内から加工液５が排出されたところで制御弁８
０ｂ，８０ｃを閉じ、この後に制御弁８０ｅ，８０ｄを
開く。これにより、加圧空気源７０ｂから圧縮空気が制
御弁８０ｅを介して二次フィルタ１４ａの上部６６に供
給され、二次フィルタ１４ａの上部６６に溜まっていた
加工液５をフィルタエレメント６７の内部から外部表面
へ押し出す。するとフィルタエメント６７の表面に付着
していた加工スラッジ６はフィルタエレメント６７の内
部から外部表面に押し出された加工液５によって取除か
れ、加工スラッジ６が濃縮された加工液５となって管路
６１を通って制御弁８０ｄを介して三次フィルタ５７の
袋状の濾紙５８へ排出される。加工スラッジ６が濃縮さ
れた加工液５は袋状の濾紙５８により、加工スラッジ６
は濾紙５８内に残り、加工液５だけが濾紙５８を抜けて
第１タンク７に戻される。こうして、フィルタエレメン
ト６７の表面に付着した加工スラッジ６が取除いた後、
制御弁８０ｅ，８０ｄを閉じ、制御弁８０ａを開き、ポ
ンプ１１の運転を開始させ第１タンク７内の加工液５の
濾過を再開する。The processing liquid 5 from which the processing sludge 6 that has flowed out to the upper portion 66 of the secondary filter 14a is removed is supplied to the second tank 8 through the control valve 80a and the conduit 27b. However, as the secondary filter 14a continues to filter, the filter element 67 becomes clogged with the processing sludge 6, and the filtration flow rate of the processing liquid 5 from which the processing sludge 6 supplied to the second tank 8 is removed gradually. It will decrease. When the filter element 67 becomes clogged, the supply pressure of the working fluid 5 supplied to the secondary filter 14a by the pump 11 also rises. Therefore, when the supply pressure becomes equal to or higher than the set level, a pressure discriminating means 68 for setting the supply pressure when the reduction of the filtration flow rate is not a problem is provided in the middle of the pipe line 27a. ,
A signal is output from the pressure determination means 68 to the control means 69.
Upon receiving the signal, the control means 69 stops the operation of the pump 11, closes the control valve 80a, and opens the control valves 80b and 80c. As a result, compressed air is supplied from the pressurized air source 70a to the lower portion 65 of the secondary filter 14a via the control valve 80b, and the machining fluid 5 accumulated in the lower portion 65 of the secondary filter 14a passes through the pipe 61. 1st through control valve 80c
It is discharged to the tank 7. Then, when the machining fluid 5 is discharged from the lower portion 65 of the secondary filter 14a, the control valve 8
0b and 80c are closed, and then the control valves 80e and 80d are opened. As a result, compressed air is supplied from the pressurized air source 70b to the upper portion 66 of the secondary filter 14a via the control valve 80e, and the working fluid 5 accumulated in the upper portion 66 of the secondary filter 14a is discharged from the inside of the filter element 67. Extrude to external surface. Then, the working sludge 6 adhering to the surface of the filter element 67 is removed by the working liquid 5 extruded from the inside of the filter element 67 to the outer surface, and the working sludge 6 becomes a concentrated working liquid 5 into a pipe. It is discharged to the bag-shaped filter paper 58 of the tertiary filter 57 through the passage 61 and the control valve 80d. The processing liquid 5 in which the processing sludge 6 is concentrated is processed by the bag-shaped filter paper 58 into the processing sludge 6
Remains in the filter paper 58, and only the working liquid 5 passes through the filter paper 58 and is returned to the first tank 7. Thus, after removing the processed sludge 6 attached to the surface of the filter element 67,
The control valves 80e and 80d are closed, the control valve 80a is opened, the operation of the pump 11 is started, and the filtration of the processing liquid 5 in the first tank 7 is restarted.

【００３６】上記の一連の動作により、加工スラッジ６
は全て三次フィルタ５７に集められるので、最終的な加
工スラッジ５９の廃棄作業は、三次フィルタ５７の袋状
の濾紙５８ごと廃棄すればよい。By the above series of operations, the processing sludge 6
Since all of them are collected in the tertiary filter 57, the final disposal work of the processed sludge 59 may be discarded together with the bag-shaped filter paper 58 of the tertiary filter 57.

【００３７】このように、本実施例の放電加工装置は、
電極１と被加工物２で形成される加工間隙を含み、水も
しくは水を主体とした加工液５を溜めて放電加工が行な
われる加工槽４と、前記加工間隙で放電加工に使用され
て汚濁した加工液５を制御弁２０ｇを介し管路２６を通
して受入れる第１タンク７と、前記第１タンク７内に配
設され、底部が傾斜した第４タンク５０と、前記第４タ
ンク５０の最深部に管路５５で連結されたマグネット式
フィルタである一次フィルタ５１と、前記第１タンク７
内の加工液５を管路２７ａを通してポンプ１１で汲上げ
て濾過する積層ペーパフィルタからなるフィルタエレメ
ント６７を装着した二次フィルタ１４ａと、前記一次フ
ィルタ５１及び二次フィルタ１４ａで濾過された加工ス
ラッジ６を収納し、加工液５と加工スラッジ６とを濾紙
５８によって分離する三次フィルタ５７と、前記一次フ
ィルタ５１及び二次フィルタ１４ａに付着した加工スラ
ッジ６を前記三次フィルタ５７へ供給する圧力判別手段
６８、制御手段６９、加圧空気源７０ａ，７０ｂ、制御
弁８０ａ〜８０ｅ、モータ５２、スクリュ５４からなる
供給手段と、前記二次フィルタ１４ａで濾過された加工
液５を管路２７ｂ及び制御弁８０ａを通して受入れる第
２タンク８と、前記第１タンク７と第２タンク８との間
に位置し、前記第１タンク７内の加工液５と第２タンク
８内の加工液５が混合した加工液５を受入れる第３タン
ク９と、前記第３タンク９内の加工液５をポンプ１０で
汲上げ管路２１を通し制御弁２０ａを介して前記加工槽
４に供給する第１供給路と、前記第２タンク８内の加工
液５をポンプ１２で汲上げ管路２２，２５を通し制御弁
２０ｆを介して前記加工間隙に供給する第２供給路と、
前記第２タンク８内の加工液５を脱イオン化するイオン
交換手段１７ａ，１７ｂと、前記イオン交換手段１７
ａ，１７ｂのイオン交換樹脂によって脱イオン化された
加工液５を管路２３ａ，２３ｂから制御弁２０ｅを経て
管路２５を通し制御弁２０ｆを介して前記加工間隙に供
給する第３供給路と、前記イオン交換手段１７ａ，１７
ｂのイオン交換樹脂によって脱イオン化された加工液５
を管路２３ａ，２３ｂ，２４を通し前記第２タンク８に
戻す返還路と、荒加工時に前記第２タンク８内の加工液
５の電導度が設定されたレベル以上になったとき、及び
設定されたレベル以下にあるときに所定の信号を制御手
段１９に出力する第１電導度判別手段１５と、前記第１
電導度判別手段１５の出力信号及び加工条件設定手段１
８からの加工条件に応じて前記第２タンク８内の加工液
５の供給路を選択する制御手段１９と、前記イオン交換
手段１７ａ，１７ｂによって脱イオン化された加工液５
の電導度が設定されたレベル以上に上昇したときに信号
を制御手段１９に出力する第２電導度判別手段１６と、
前記第２電導度判別手段１６の出力信号によって加工液
５の電導度が設定されたレベル以上になったことを報知
する表示手段２９とを備えている。As described above, the electric discharge machining apparatus of this embodiment is
A machining tank 4 including a machining gap formed by the electrode 1 and the workpiece 2 in which water or a machining liquid 5 mainly containing water is stored for electrical discharge machining, and a contamination used by electrical discharge machining in the machining gap. The first tank 7 that receives the processed liquid 5 through the conduit 26 through the control valve 20g, the fourth tank 50 that is disposed in the first tank 7 and has a sloping bottom, and the deepest part of the fourth tank 50. A primary filter 51, which is a magnet type filter connected to a pipe line 55, and the first tank 7
A secondary filter 14a equipped with a filter element 67 consisting of a laminated paper filter for filtering the working fluid 5 therein by a pump 11 through a pipe 27a, and the working sludge filtered by the primary filter 51 and the secondary filter 14a. A third filter 57 that stores the processing liquid 6 and separates the processing liquid 5 and the processing sludge 6 with a filter paper 58, and a pressure determination means that supplies the processing sludge 6 attached to the primary filter 51 and the secondary filter 14a to the tertiary filter 57. 68, control means 69, pressurized air sources 70a, 70b, control valves 80a-80e, motor 52, screw 54, and the working fluid 5 filtered by the secondary filter 14a through the conduit 27b and the control valve. The second tank 8 receiving through 80a and the first tank 7 and the second tank 8, The third tank 9 that receives the working fluid 5 in which the working fluid 5 in the tank 7 and the working fluid 5 in the second tank 8 are mixed, and the working fluid 5 in the third tank 9 are pumped up by a pump 21 Through the control valve 20a and the first supply path for supplying the processing fluid 5 in the second tank 8 with the pump 12 through the pumping conduits 22 and 25 through the control valve 20f. A second supply path for supplying the machining gap;
Ion exchange means 17a and 17b for deionizing the working fluid 5 in the second tank 8, and the ion exchange means 17
a third supply path for supplying the machining liquid 5 deionized by the ion-exchange resin of a, 17b to the machining gap from the conduits 23a, 23b, the control valve 20e, the conduit 25, and the control valve 20f. The ion exchange means 17a, 17
Working fluid 5 deionized by the ion-exchange resin of b.
And a return path through which pipes 23a, 23b and 24 are returned to the second tank 8, and when the electric conductivity of the working fluid 5 in the second tank 8 becomes equal to or higher than a set level during rough processing, and The first conductivity determining means 15 for outputting a predetermined signal to the control means 19 when the level is below the predetermined level;
Output signal of the electric conductivity determination means 15 and processing condition setting means 1
Control means 19 for selecting the supply path of the working fluid 5 in the second tank 8 according to the working conditions from 8, and the working fluid 5 deionized by the ion exchange means 17a, 17b.
A second conductivity determining means 16 for outputting a signal to the control means 19 when the conductivity of the electric field rises above a set level,
A display unit 29 is provided for notifying that the electric conductivity of the working fluid 5 has become equal to or higher than the set level by the output signal of the second electric conductivity judging unit 16.

【００３８】即ち、本実施例の放電加工装置は、上記第
一実施例の放電加工装置の第１タンク７内に第４タンク
５０を設けるとともに一次乃至三次フィルタ５１，１４
ａ，５７を設け、放電加工によって発生した加工スラッ
ジ６を一次フィルタ５１から三次フィルタ５７に分けて
加工液５から除去するものである。That is, in the electric discharge machine of this embodiment, the fourth tank 50 is provided in the first tank 7 of the electric discharge machine of the first embodiment, and the primary to tertiary filters 51, 14 are provided.
a and 57 are provided, and the machining sludge 6 generated by the electric discharge machining is divided from the primary filter 51 to the tertiary filter 57 and removed from the machining fluid 5.

【００３９】したがって、上記第一実施例と同様に、加
工に応じた最適な電導度の加工液が加工間隙に迅速に供
給でき、これにより荒加工から仕上加工までの加工が迅
速に行なわれ、イオン交換樹脂の無駄な消耗を避けるこ
とができる。このため、加工条件の変更、あるいは加工
液の電導度の上昇に応じて、加工液の電導度は自動的に
調整され加工間隙に供給されるので、作業性及び経済性
が向上する。しかも、各フィルタ５１，１４ａ，５７に
かかる負担は軽くなり、且つ二次フィルタ１４ａは珪素
土によるプリコート等をする必要がなく、フィルタエレ
メント６７が加工スラッジ６で目詰まりしてもフィルタ
エレメント６７と加工スラッジ６の分離ができるので、
一次フィルタ５１と二次フィルタ１４ａにかかるランニ
ングコストを低減できる。また、一次フィルタ５１と二
次フィルタ１４ａで除去された加工スラッジ６は三次フ
ィルタ５７に集められるので、加工スラッジ６の最終的
な廃棄処理にかかる作業負担を軽減できる。Therefore, similarly to the first embodiment, the working fluid having the optimum electric conductivity according to the working can be quickly supplied to the working gap, whereby the working from the rough working to the finish working can be performed quickly. It is possible to avoid wasteful consumption of the ion exchange resin. Therefore, the electric conductivity of the working liquid is automatically adjusted and supplied to the working gap according to the change of the working condition or the increase of the electric conductivity of the working liquid, so that the workability and the economical efficiency are improved. Moreover, the load on each of the filters 51, 14a, 57 is lightened, and the secondary filter 14a does not need to be precoated with silicon earth, so that even if the filter element 67 is clogged with the processing sludge 6, Since the processing sludge 6 can be separated,
The running cost of the primary filter 51 and the secondary filter 14a can be reduced. Further, since the processed sludge 6 removed by the primary filter 51 and the secondary filter 14a is collected by the tertiary filter 57, the work load required for the final disposal of the processed sludge 6 can be reduced.

【００４０】[0040]

【発明の効果】以上説明したように、請求項１の発明の
放電加工装置は、加工槽と、第１乃至第３タンクと、フ
ィルタと、第１乃至第３供給路と、イオン交換手段と、
返還路と、第１及び第２電導度判別手段と、制御手段
と、表示手段とを備え、加工条件によって必要な電導度
に調整された加工液を電極と被加工物で形成される加工
間隙に供給できるように供給路を設け、加工条件及び必
要な電導度を判別する電導度判別手段からの信号によっ
て供給路を適宜選択することにより、加工に応じた電導
度の最適な加工液が加工間隙に迅速に供給でき、これに
より荒加工から仕上加工までの加工が迅速に行なわれ、
イオン交換樹脂の無駄な消耗を避けることができるの
で、作業性及び経済性が向上する。As described above, the electric discharge machining apparatus according to the first aspect of the invention includes the machining tank, the first to third tanks, the filter, the first to third supply paths, and the ion exchange means. ,
A machining gap that includes a return path, first and second electric conductivity determination means, control means, and display means, and a machining liquid adjusted to have a necessary electric conductivity according to machining conditions is formed between the electrode and the workpiece. By providing a supply path so that it can be supplied to the machine, and selecting the supply path appropriately according to the signal from the conductivity determining means that determines the processing conditions and the required conductivity, the processing liquid with the optimum conductivity according to the processing can be processed. It can be quickly supplied to the gap, which allows for rapid processing from roughing to finishing.
Since wasteful consumption of the ion exchange resin can be avoided, workability and economy are improved.

【００４１】請求項２の発明の放電加工装置は、加工槽
と、第１乃至第３タンクと、フィルタと、第１乃至第３
供給路と、イオン交換手段と、返還路と、第１及び第２
電導度判別手段と、制御手段とを備え、電極と被加工物
で形成される加工間隙に加工液を供給する供給路に、加
工液を脱イオン化するイオン交換手段を並列に設け、加
工液のイオン交換には一方のイオン交換手段のみ働か
せ、このイオン交換手段の脱イオン化性能が低下した場
合には、もう一方のイオン交換手段に切換えて加工液の
イオン交換を行なうことにより、寿命になったイオン交
換樹脂の交換作業のために加工を中断する必要がないの
で、イオン交換樹脂の交換作業に要する時間は加工時間
に影響しない。According to a second aspect of the present invention, there is provided an electric discharge machining apparatus, a machining tank, first to third tanks, a filter, and first to third tanks.
Supply path, ion exchange means, return path, first and second
An ion exchange means for deionizing the working fluid is provided in parallel in a supply path that includes a conductivity determining means and a control means and supplies the working fluid to a working gap formed by an electrode and a workpiece. For ion exchange, only one of the ion exchange means is activated, and when the deionization performance of this ion exchange means deteriorates, the ion exchange of the working fluid is carried out by switching to the other ion exchange means, and the life is reached. Since it is not necessary to interrupt the processing for exchanging the ion exchange resin, the time required for exchanging the ion exchange resin does not affect the processing time.

【００４２】請求項３の発明の放電加工装置は、加工槽
と、第１乃至第４タンクと、一次乃至三次フィルタと、
供給手段と、第１乃至第３供給路と、イオン交換手段
と、返還路と、第１及び第２電導度判別手段と、制御手
段と、表示手段とを備え、放電加工によって発生した加
工スラッジを一次フィルタから三次フィルタに分けて加
工液から除去することにより、各フィルタにかかる負担
は軽くなり、且つ二次フィルタは珪素土によるプリコー
ト等をする必要がなく、フィルタエレメントが加工スラ
ッジで目詰まりしてもフィルタエレメントと加工スラッ
ジの分離ができるので、一次フィルタと二次フィルタに
かかるランニングコストを低減でき、しかも、一次フィ
ルタと二次フィルタで除去された加工スラッジは三次フ
ィルタに集められるので、加工スラッジの最終的な廃棄
処理にかかる作業負担を軽減できる。An electric discharge machining apparatus according to a third aspect of the invention is a machining tank, first to fourth tanks, primary to tertiary filters, and
Machining sludge generated by electric discharge machining, including a supply means, first to third supply paths, an ion exchange means, a return path, first and second electric conductivity determination means, a control means, and a display means. By separating the primary filter from the tertiary filter and removing it from the working fluid, the load on each filter is lightened, and the secondary filter does not need to be precoated with silicon earth, and the filter element is clogged with the working sludge. Even though the filter element and the processed sludge can be separated, the running cost of the primary filter and the secondary filter can be reduced, and the processed sludge removed by the primary filter and the secondary filter is collected in the tertiary filter. The work load required for the final disposal of processed sludge can be reduced.

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

【図１】図１は本発明の第一実施例である放電加工装置
の全体構成を示す説明図である。FIG. 1 is an explanatory diagram showing an overall configuration of an electric discharge machine that is a first embodiment of the present invention.

【図２】図２は本発明の第二実施例である放電加工装置
の要部構成を示す説明図である。FIG. 2 is an explanatory diagram showing a main configuration of an electric discharge machine which is a second embodiment of the present invention.

【図３】図３は図２の二次フィルタの動作を示す斜視図
である。FIG. 3 is a perspective view showing the operation of the secondary filter of FIG.

【符号の説明】[Explanation of symbols]

１ 電極 ２ 被加工物 ４ 加工槽 ５ 加工液 ６ 加工スラッジ ７ 第１タンク ８ 第２タンク ９ 第３タンク １０〜１３ ポンプ １４ フィルタ １５ 第１電導度判別手段 １６ 第２電導度判別手段 １７ａ，１７ｂ イオン交換手段 １８ 加工条件設定手段 １９ 制御手段 ２０ａ〜２０ｇ，８０ａ〜８０ｅ 制御弁 ２１〜２７ｂ，５５，５６，６０，６１ 管路 ２８ａ〜２８ｄ 逆止弁 ２９ 表示手段 １４ａ 二次フィルタ ５０ 第４タンク ５１ 一次フィルタ ５７ 三次フィルタ ５８ 濾紙 ６７ フィルタエレメント ６８ 圧力判別手段 ６９ 制御手段 ７０ａ，７０ｂ 加圧空気源 DESCRIPTION OF SYMBOLS 1 Electrode 2 Work piece 4 Processing tank 5 Processing liquid 6 Processing sludge 7 1st tank 8 2nd tank 9 3rd tank 10-13 Pump 14 Filter 15 1st conductivity determination means 16 2nd conductivity determination means 17a, 17b Ion exchange means 18 Processing condition setting means 19 Control means 20a to 20g, 80a to 80e Control valves 21 to 27b, 55, 56, 60, 61 Pipe lines 28a to 28d Check valve 29 Display means 14a Secondary filter 50 Fourth tank 51 primary filter 57 tertiary filter 58 filter paper 67 filter element 68 pressure determination means 69 control means 70a, 70b pressurized air source

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 電極と被加工物で形成される加工間隙を
含み、水もしくは水を主体とした加工液を溜めて放電加
工が行なわれる加工槽と、 前記加工間隙で放電加工に使用されて汚濁した加工液を
受入れる第１タンクと、 前記第１タンク内の加工液を濾過するフィルタと、 前記フィルタによって濾過された加工液を受入れる第２
タンクと、 前記第１タンク内の加工液と第２タンク内の加工液が混
合した加工液を受入れる第３タンクと、 前記第３タンク内の加工液を前記加工槽に供給する第１
供給路と、 前記第２タンク内の加工液を前記加工間隙に供給する第
２供給路と、 前記第２タンク内の加工液を脱イオン化するイオン交換
手段と、 前記脱イオン化された加工液を前記加工間隙に供給する
第３供給路と、 前記脱イオン化された加工液を前記第２タンクに戻す返
還路と、 荒加工時に前記第２タンク内の加工液の電導度が設定さ
れたレベル以上になったとき、及び設定されたレベル以
下にあるときに信号を出力する第１電導度判別手段と、 前記第１電導度判別手段の出力信号及び加工条件に応じ
て前記第２タンク内の加工液の供給路を選択する制御手
段と、 前記イオン交換手段で脱イオン化された加工液の電導度
が設定されたレベル以上に上昇したときに信号を出力す
る第２電導度判別手段と、 前記第２電導度判別手段の出力信号によって加工液の電
導度が設定されたレベル以上になったことを報知する表
示手段とを具備することを特徴とする放電加工装置。1. A machining tank including a machining gap formed by an electrode and a workpiece, in which water or a machining liquid mainly composed of water is stored for electric discharge machining, and a machining tank used for electric discharge machining in the machining gap. A first tank for receiving the contaminated working fluid, a filter for filtering the working fluid in the first tank, and a second for receiving the working fluid filtered by the filter
A tank, a third tank for receiving a working fluid in which the working fluid in the first tank and the working fluid in the second tank are mixed, and a first tank for supplying the working fluid in the third tank to the working tank
A supply path; a second supply path for supplying the machining fluid in the second tank to the machining gap; an ion exchange means for deionizing the machining fluid in the second tank; and the deionized machining fluid. A third supply passage for supplying the machining gap, a return passage for returning the deionized machining fluid to the second tank, and an electric conductivity of the machining fluid in the second tank during rough machining which is equal to or higher than a set level. And a processing level in the second tank according to the output signal of the first electrical conductivity determination means and the processing conditions. Control means for selecting a liquid supply path; second conductivity determining means for outputting a signal when the conductivity of the working fluid deionized by the ion exchange means rises above a set level; 2 Output of conductivity determination means Discharge machining apparatus characterized by comprising a display means for informing that the conductivity of the working fluid is equal to or greater than the set level by No.. 【請求項２】 電極と被加工物で形成される加工間隙を
含み、水もしくは水を主体とした加工液を溜めて放電加
工が行なわれる加工槽と、 前記加工間隙で放電加工に使用されて汚濁した加工液を
受入れる第１タンクと、 前記第１タンク内の加工液を濾過するフィルタと、 前記フィルタによって濾過された加工液を受入れる第２
タンクと、 前記第１タンク内の加工液と第２タンク内の加工液が混
合した加工液を受入れる第３タンクと、 前記第３タンク内の加工液を前記加工槽に供給する第１
供給路と、 前記第２タンク内の加工液を前記加工間隙に供給する第
２供給路と、 前記第２タンク内の加工液を脱イオン化する並列に配設
されたイオン交換手段と、 前記イオン交換手段の一方で脱イオン化された加工液を
前記加工間隙に供給する第３供給路と、 前記脱イオン化された加工液を前記第２タンクに戻す返
還路と、 荒加工時に前記第２タンク内の加工液の電導度が設定さ
れたレベル以上になったとき、及び設定されたレベル以
下にあるときに信号を出力する第１電導度判別手段と、 前記イオン交換手段で脱イオン化された加工液の電導度
が設定されたレベル以上に上昇したときに信号を出力す
る第２電導度判別手段と、 前記第１電導度判別手段の出力信号及び加工条件に応じ
て前記第２タンク内の加工液の供給路を選択するととも
に、前記第２電導度判別手段の出力信号によって前記加
工液が供給されていた一方のイオン交換手段からもう一
方のイオン交換手段へ加工液の供給を変更する制御手段
とを具備することを特徴とする放電加工装置。2. A machining tank including a machining gap formed by an electrode and a workpiece, in which water or a machining liquid mainly composed of water is stored to perform electric discharge machining, and a machining tank used for electric discharge machining in the machining gap. A first tank for receiving the contaminated working fluid, a filter for filtering the working fluid in the first tank, and a second for receiving the working fluid filtered by the filter
A tank, a third tank for receiving a working fluid in which the working fluid in the first tank and the working fluid in the second tank are mixed, and a first tank for supplying the working fluid in the third tank to the working tank
A supply path; a second supply path for supplying the machining liquid in the second tank to the machining gap; an ion exchange unit arranged in parallel for deionizing the machining liquid in the second tank; A third supply path that supplies deionized machining fluid to the machining gap on one side of the exchange means, a return path that returns the deionized machining fluid to the second tank, and a second tank in the second tank during rough machining A first conductivity discriminating means for outputting a signal when the electric conductivity of the machining fluid is above a set level or below the set level; and the machining fluid deionized by the ion exchange means. Second conductivity determining means for outputting a signal when the conductivity of the second tank rises above a set level, and the working liquid in the second tank according to the output signal of the first conductivity determining means and the processing conditions. When you select the supply path of In addition, a control means for changing the supply of the working fluid from the one ion exchange means to which the working fluid was supplied to the other ion exchange means by the output signal of the second conductivity determining means. Characteristic electric discharge machine. 【請求項３】 電極と被加工物で形成される加工間隙を
含み、水もしくは水を主体とした加工液を溜めて放電加
工が行なわれる加工槽と、 前記加工間隙で放電加工に使用されて汚濁した加工液を
受入れる第１タンクと、 前記第１タンク内に配設され、底部が傾斜した第４タン
クと、 前記第４タンクの最深部に連結されたマグネット式の一
次フィルタと、 前記第１タンク内の加工液を濾過する二次フィルタと、 前記一次フィルタ及び二次フィルタで濾過された加工ス
ラッジを収納し、加工液と加工スラッジとを分離する三
次フィルタと、 前記一次フィルタ及び二次フィルタに付着した加工スラ
ッジを前記三次フィルタへ供給する供給手段と、 前記二次フィルタで濾過された加工液を受入れる第２タ
ンクと、 前記第１タンク内の加工液と第２タンク内の加工液が混
合した加工液を受入れる第３タンクと、 前記第３タンク内の加工液を前記加工槽に供給する第１
供給路と、 前記第２タンク内の加工液を前記加工間隙に供給する第
２供給路と、 前記第２タンク内の加工液を脱イオン化するイオン交換
手段と、 前記イオン交換手段で脱イオン化された加工液を前記加
工間隙に供給する第３供給路と、 前記イオン交換手段で脱イオン化された加工液を前記第
２タンクに戻す返還路と、 荒加工時に前記第２タンク内の加工液の電導度が設定さ
れたレベル以上になったとき、及び設定されたレベル以
下にあるときに信号を出力する第１電導度判別手段と、 前記第１電導度判別手段の出力信号及び加工条件に応じ
て前記第２タンク内の加工液の供給路を選択する制御手
段と、 前記イオン交換手段で脱イオン化された加工液の電導度
が設定されたレベル以上に上昇したときに信号を出力す
る第２電導度判別手段と、 前記第２電導度判別手段の出力信号によって加工液の電
導度が設定されたレベル以上になったことを報知する表
示手段とを具備することを特徴とする放電加工装置。3. A machining tank including a machining gap formed by an electrode and a workpiece, in which water or a machining liquid mainly composed of water is stored for electric discharge machining, and a machining tank used for electric discharge machining in the machining gap. A first tank for receiving a polluted working fluid; a fourth tank disposed in the first tank and having an inclined bottom; a magnet-type primary filter connected to the deepest part of the fourth tank; A secondary filter for filtering the working fluid in one tank; a tertiary filter for accommodating the working sludge filtered by the primary filter and the secondary filter to separate the working fluid and the working sludge; and the primary filter and the secondary filter A supply unit that supplies the processing sludge attached to the filter to the tertiary filter, a second tank that receives the processing liquid filtered by the secondary filter, a processing liquid in the first tank, and a second tank. A third tank for receiving a working fluid working fluid are mixed in the tank, the supplying working fluid of the third tank to the machining tank 1
A supply path, a second supply path for supplying the working fluid in the second tank to the working gap, an ion exchange means for deionizing the working fluid in the second tank, and deionized by the ion exchange means. A third supply passage for supplying the machining fluid to the machining gap, a return passage for returning the machining fluid deionized by the ion exchange means to the second tank, and a machining fluid in the second tank for rough machining. First conductivity determining means for outputting a signal when the conductivity is equal to or higher than a set level or equal to or lower than the set level, and depending on an output signal of the first conductivity determining means and processing conditions. And a control means for selecting a working fluid supply path in the second tank; and a second means for outputting a signal when the conductivity of the working fluid deionized by the ion exchange means rises above a set level. With conductivity determination means An electric discharge machining apparatus comprising: a display unit that notifies that the electric conductivity of the machining fluid has reached a set level or more by an output signal of the second electric conductivity determination unit.
JP20390792A 1992-07-30 1992-07-30 Electric discharge machining device Pending JPH0647624A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20390792A JPH0647624A (en) 1992-07-30 1992-07-30 Electric discharge machining device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20390792A JPH0647624A (en) 1992-07-30 1992-07-30 Electric discharge machining device

Publications (1)

Publication Number Publication Date
JPH0647624A true JPH0647624A (en) 1994-02-22

Family

ID=16481677

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20390792A Pending JPH0647624A (en) 1992-07-30 1992-07-30 Electric discharge machining device

Country Status (1)

Country Link
JP (1) JPH0647624A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8101683B2 (en) 2009-05-29 2012-01-24 Shin-Etsu Chemical Co., Ltd. Addition-curable silicone emulsion composition
WO2020031251A1 (en) * 2018-08-07 2020-02-13 三菱電機株式会社 Electric discharge machining device and electric discharge machining method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57205027A (en) * 1981-06-15 1982-12-16 Amada Co Ltd Working liquid supplier for wire cut discharge machining machine
JPH0215826B2 (en) * 1981-03-26 1990-04-13 Fuji Photo Film Co Ltd
JP3100026B2 (en) * 1995-03-07 2000-10-16 株式会社日立製作所 Transport mechanism

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0215826B2 (en) * 1981-03-26 1990-04-13 Fuji Photo Film Co Ltd
JPS57205027A (en) * 1981-06-15 1982-12-16 Amada Co Ltd Working liquid supplier for wire cut discharge machining machine
JP3100026B2 (en) * 1995-03-07 2000-10-16 株式会社日立製作所 Transport mechanism

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8101683B2 (en) 2009-05-29 2012-01-24 Shin-Etsu Chemical Co., Ltd. Addition-curable silicone emulsion composition
WO2020031251A1 (en) * 2018-08-07 2020-02-13 三菱電機株式会社 Electric discharge machining device and electric discharge machining method

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