JPH0659570B2 - Electric discharge machine - Google Patents
Electric discharge machineInfo
- Publication number
- JPH0659570B2 JPH0659570B2 JP1806887A JP1806887A JPH0659570B2 JP H0659570 B2 JPH0659570 B2 JP H0659570B2 JP 1806887 A JP1806887 A JP 1806887A JP 1806887 A JP1806887 A JP 1806887A JP H0659570 B2 JPH0659570 B2 JP H0659570B2
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- Prior art keywords
- machining
- time
- discharge
- pulse
- abnormal
- Prior art date
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
【発明の詳細な説明】 [産業上の利用分野] この発明は、工具電極と被加工物とで形成される加工隙
間に休止時間を置きながらパルス状加工電圧を印加して
加工を行う際、加工状態の異常が検出された場合に休止
時間を変更することにより加工状態の異常を回避する放
電加工装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention, when performing machining by applying a pulsed machining voltage while leaving a pause in a machining gap formed between a tool electrode and a workpiece, The present invention relates to an electric discharge machining apparatus that avoids an abnormality in a machining state by changing a pause time when an abnormality in the machining state is detected.
[従来の技術] 第3図は従来の放電加工装置を示す概略図であり、図に
おいて(1)は電極、(2)は被加工物、(3)はXク
ロステーブル、(4)はYクロステーブル、(5)は電
極(1)と被加工物(2)で形成される加工隙間にパル
ス状電流を供給する加工電源、(6)は電極(1)の上
下方向駆動を行うアクチュエータ、(7)はXクロステ
ーブルの駆動を行うアクチュエータ、(8)はYクロス
テーブルの駆動を行うアクチュエータ、(9a),(9b),(9
c)は上記アクチュエータ(6),(7),(8)に電流
を供給するサーボアンプ、(10)は加工隙間の電圧を検出
する極間電圧検出回路、(11)は電圧を印加してから放電
が発生するまでの経過時間(以下、無負荷時間Td)に
相当するパルス信号を発生する。Tdパルス発生器、(1
2)はTdパルスのパルス幅を計測するTd計測器、(13)
はTd計測器(12)の計測結果から各放電パルスを即放電
(D1)、正常放電(D2)、オープン(D3)の3種
に分類した出力信号を発生する放電波形分類器、(14),
(15),(16)は放電波形分類器(13)にて出力された信号を
3種のグループごとにカウントするカウンタ、(17)は即
放電(D1)のカウント数から加工状態が正常か異常か
を判別する加工状態判別器、(18)は(14),(15),(16)の
カウント数から電極送り制御を行う電極送り制御装置、
(19)は加工状態判別器(17)の結果から休止時間などの制
御を行う、電気条件制御装置である。[Prior Art] FIG. 3 is a schematic diagram showing a conventional electric discharge machining apparatus. In the figure, (1) is an electrode, (2) is a workpiece, (3) is an X cross table, and (4) is Y. A cross table, (5) a machining power supply for supplying a pulsed current to a machining gap formed by the electrode (1) and the workpiece (2), and (6) an actuator for vertically driving the electrode (1), (7) is an actuator for driving the X cross table, (8) is an actuator for driving the Y cross table, (9a), (9b), (9
c) is a servo amplifier that supplies current to the actuators (6), (7), and (8), (10) is a gap voltage detection circuit that detects the voltage of the machining gap, and (11) is a voltage applied A pulse signal corresponding to an elapsed time from when the discharge occurs to the discharge (hereinafter, no-load time Td) is generated. Td pulse generator, (1
2) is a Td measuring device for measuring the pulse width of the Td pulse, (13)
Is a discharge waveform classifier that generates output signals that classify each discharge pulse into three types of immediate discharge (D1), normal discharge (D2), and open (D3) based on the measurement results of the Td measuring device (12), (14) ,
(15) and (16) are counters that count the signals output by the discharge waveform classifier (13) for each of the three types of groups, and (17) is whether the machining status is normal from the count value of immediate discharge (D1). A machining state discriminator for discriminating whether or not there is an abnormality, (18) is an electrode feed control device for performing electrode feed control based on the count numbers of (14), (15) and (16)
Reference numeral (19) is an electric condition control device for controlling the down time and the like based on the result of the processing state discriminator (17).
次に動作について説明する。加工電源(5)は電極
(1)と被加工物(2)で形成される加工隙間にパルス
電圧を供給し、加工隙間に放電を発生させつつ、電極
(1)および被加工物(2)の相対位置を変化させて加
工を行うものである。電極(1)の上下動はアクチュエ
ータ(6)、被加工物(2)の移動はX,Yクロステー
ブル(3),(4)を駆動するアクチュエータ(7),
(8)によって行われる。加工中の加工隙間の電圧は極
間電圧検出回路(10)により検出され、Tdパルス発生器
(11)は電圧を印加してから放電が発生するまでの無負荷
時間Tdに相当するパルス信号を発生する。第4図は極
間波形とTdパルス信号を模式的に示したものである。
Td計測器(12)はTdパルス信号のパルス幅すなわち放
電波形個々の無負荷時間Tdを計測し、その結果から放
電波形分類器(13)は各放電パルス個々のを即放電(D
1)、正常放電(D2)、オープン(D3)の3種に分
類した出力信号を発生する。ここで、 ()D1:0<Td<T1…短絡が発生 したかあるいは加工隙間の絶縁耐力が回復 していない場合。Next, the operation will be described. The machining power supply (5) supplies a pulse voltage to a machining gap formed by the electrode (1) and the workpiece (2) to generate an electric discharge in the machining gap, and at the same time, the electrode (1) and the workpiece (2). Is performed by changing the relative position of. The vertical movement of the electrode (1) moves the actuator (6), and the movement of the workpiece (2) moves the actuators (7), which drive the X, Y cross tables (3), (4).
(8). The voltage of the machining gap during machining is detected by the inter-electrode voltage detection circuit (10) and the Td pulse generator
(11) generates a pulse signal corresponding to the no-load time Td from the application of voltage to the occurrence of discharge. FIG. 4 schematically shows the waveform between the electrodes and the Td pulse signal.
The Td measuring device (12) measures the pulse width of the Td pulse signal, that is, the no-load time Td of each discharge waveform. From the result, the discharge waveform classifier (13) immediately discharges each discharge pulse (D
Output signals classified into three types of 1), normal discharge (D2) and open (D3) are generated. Here, () D1: 0 <Td <T1 ... When a short circuit occurs or the dielectric strength of the machining gap is not recovered.
()D2:T1<Td<T2…適当な 時間の無負荷電圧が存在し加工への寄与度が 最も大きい場合。() D2: T1 <Td <T2 ... When there is an unloaded voltage for an appropriate time and the contribution to machining is the largest.
()D3:T2<Td<T3…無負荷電 圧印加時間が比較的長い場合。() D3: T2 <Td <T3 ... When the no-load voltage application time is relatively long.
である。Is.
加工隙間における電圧波形としてはある程度より長くな
い時間を持った無負荷電圧が存在するような放電の発生
形体が望ましく、電極送り制御装置(18)はカウンタ(1
4),(15),(16)によりカウントされたD1,D2,D3
の頻度により電極サーボ送りを行う。As the voltage waveform in the machining gap, it is desirable to use a discharge generation configuration in which there is a no-load voltage with a time not longer than a certain amount, and the electrode feed control device (18) uses a counter (1
D1, D2, D3 counted by 4), (15) and (16)
The electrode servo feed is performed depending on the frequency.
以上のような電極送り制御の他に、極間における加工ス
ラッジ濃度の上昇に伴って異常加工へ移行するのを防止
するため加工状態判別器(17)はD1の頻度により加工状
態が正常か異常かを判別し、制御装置(19)はその結果か
ら休止時間などの切り換え制御を行うことにより異常加
工の回避を行う。In addition to the above electrode feed control, in order to prevent a transition to abnormal machining due to an increase in machining sludge concentration between the poles, the machining state determiner (17) determines whether the machining state is normal or abnormal depending on the frequency of D1. Then, the control device (19) avoids abnormal machining by controlling the switching of the down time and the like based on the result.
[発明が解決しようとする問題点] 従来の放電加工装置は以上のように構成されているの
で、異常加工状態の判別は短絡・即放電の頻度のみで行
われ、安定加工から異常加工への変遷を適確に判別・予
測して加工条件を制御することができず、電極面積・加
工電気条件などがことなる場合については判別レベルを
変更することが必要であった。また、判別レベルを固定
とした場合、異常加工の回避が最適に行われない、すな
わち条件の変更が早過ぎたり遅過ぎたりすることによる
加工効率の低下、あるいは定常アーク放電による被加工
物の損傷が発生するなどの問題があった。[Problems to be Solved by the Invention] Since the conventional electric discharge machining apparatus is configured as described above, the abnormal machining state is determined only by the frequency of short circuit / immediate electric discharge, and stable machining to abnormal machining is performed. It was necessary to change the discrimination level when the machining conditions could not be controlled by accurately discriminating and predicting the transition, and the electrode area and machining electrical conditions were different. Also, if the discrimination level is fixed, abnormal machining is not optimally avoided, that is, the machining efficiency decreases due to too early or too late changing of conditions, or damage to the workpiece due to steady arc discharge. There was a problem such as occurrence.
この発明は上記のような問題点を解決するためになされ
たもので、安定加工から異常加工への変遷を適確に予測
・判別して加工条件を制御することにより、異常加工を
回避し、きわめて安定かつ効率の良い加工を行うことの
できる放電加工装置を得ることを目的とする。The present invention has been made to solve the above problems, by avoiding abnormal machining by accurately predicting and determining the transition from stable machining to abnormal machining and controlling the machining conditions, It is an object of the present invention to obtain an electric discharge machining device capable of extremely stable and efficient machining.
[問題点を解決するための手段] この発明に係る放電加工装置は、加工間隙に印加するパ
ルス電圧の時間幅を第1区分時間T1、第2区分時間T
2、第3区分時間T3に分類する分類手段と、所定時間
もしくは所定パルス数中において第1区分時間T1で発
生する放電パルス数D1と第2区分時間T2で発生する
放電パルス数D2の比D1/D2を所定時間毎に計算す
る計算手段と、現在のD1/D2値と前回のD1/D2
値の比率または差分値と基準値とを比較し、その比率ま
たは差分値が基準値を超えた場合に加工状態を異常とし
て判断する加工状態判別手段と、この加工状態判別手段
より加工状態が異常である信号が出力されたとき休止時
間を増大させるように制御する制御手段とを備える構成
としたものである。[Means for Solving Problems] In the electric discharge machining apparatus according to the present invention, the time width of the pulse voltage applied to the machining gap is set to the first division time T1 and the second division time T.
2. Classification means for classifying into the third division time T3, and a ratio D1 of the number D1 of discharge pulses generated in the first division time T1 and the number D2 of discharge pulses generated in the second division time T2 within a predetermined time or a predetermined number of pulses. / D2 for every predetermined time, the current D1 / D2 value and the previous D1 / D2 value
A processing state determination unit that compares a ratio or difference value of values with a reference value and determines the processing state as abnormal when the ratio or difference value exceeds the reference value, and the processing state determination unit determines that the processing state is abnormal. And a control means for controlling so as to increase the pause time when a certain signal is output.
[作用] この発明に係る放電加工装置は、分類手段により、加工
隙間に印加するパルス電圧の時間幅を第1区分時間T
1、第2区分時間T2、第3区分時間T3に分類し、計
算手段により、所定時間もしくは所定パルス数中におい
て第1区分時間T1で発生する放電パルス数D1と第2
区分時間T2で発生する放電パルス数D2の比D1/D
2を所定時間毎に計算する。また加工状態判別手段によ
り、現在のD1/D2値と前回のD1/D2値の比率ま
たは差分値と基準値とを比較し、その比率または差分値
が基準値を超えた場合に加工状態を異常として判断し、
更に制御手段により、加工状態判別手段より加工状態が
異常である信号が出力されたとき休止時間を増大させる
ように制御する。[Operation] In the electric discharge machining device according to the present invention, the time width of the pulse voltage applied to the machining gap is set to the first division time T by the classification means.
The second dividing time T2, the third dividing time T3, and the number of discharge pulses D1 and the second discharging pulse number D1 generated in the first dividing time T1 during a predetermined time or a predetermined pulse number are calculated by the calculating means.
Ratio D1 / D of the number D2 of discharge pulses generated in the division time T2
2 is calculated every predetermined time. Further, the processing state determination means compares the current D1 / D2 value and the previous D1 / D2 value ratio or difference value with the reference value, and when the ratio or difference value exceeds the reference value, the processing state is abnormal. Judge as
Further, the control means controls so as to increase the pause time when the processing state determination means outputs a signal indicating that the processing state is abnormal.
[発明の実施例] 以下、この発明の一実施例を図にもとずいて説明する。[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to the drawings.
第1図において(1)は電極、(2)は被加工物、
(3)はXクロステーブル、(4)はYクロステーブ
ル、(5)は電極(1)と被加工物(2)で形成される
加工隙間にパルス状電流を供給する加工電源、(6)は
電極(1)の上下方向駆動を行うアクチュエータ、
(7)はXクロステーブルの駆動を行うアクチュエー
タ、(8)はYクロステーブルの駆動を行うアクチュエ
ータ、(9a),(9b),(9c)は上記アクチュエ
ータ(6),(7),(8)に電流を供給するサーボア
ンプ、(10)は加工隙間の電圧を検出する極間電圧検
出回路、(11)は電圧を印加してから放電が発生する
までの経過時間(以下、無負荷時間Td)に相当するパ
ルス信号を発生するTdパルス発生器、(12)はTd
パルスのパルス幅を計測するTd計測器、(13)はT
d計測器(12)の計測結果から各放電パルスを即放電
(D1)、正常放電(D2)、オープン(D3)の3種
に分類した出力信号を発生する分類手段である放電波形
分類器、(14),(15),(16)は放電波形分類
器(13)にて出力された信号を3種のグループごとに
カウントするカウンタ、(18)は(14),(1
5),(16)のカウント数から電極送り制御を行う電
極送り制御装置、(20)は(14),(15),(1
6)のカウント数からD1/D2(即放電パルス数/正
常放電パルス数)を計算する、第1の計算手段である第
1の計算器、(21)は該D1/D2の計算値を一旦記
憶するメモリ、(22)は第1の計算器(20)により
計算されたD1/D2の最新値とメモリ(21)に記憶
された前回のD1/D2との比率を計算する、第2の計
算手段である第2の計算器、(27)は第2の計算器
(22)で計算されたD1/D2の比率から加工状態が
正常か異常かを判別する、加工状態判別手段である加工
状態判別器、(28)は該加工状態判別器(27)の結
果から休止時間を切り換える、制御手段である制御装置
である。In FIG. 1, (1) is an electrode, (2) is a workpiece,
(3) is an X cross table, (4) is a Y cross table, (5) is a machining power supply that supplies a pulsed current to a machining gap formed by the electrode (1) and the workpiece (2), and (6). Is an actuator for vertically driving the electrode (1),
(7) is an actuator for driving the X cross table, (8) is an actuator for driving the Y cross table, and (9a), (9b) and (9c) are the actuators (6), (7) and (8). ), A servo amplifier for supplying a current, (10) an inter-electrode voltage detection circuit for detecting the voltage in the machining gap, and (11) an elapsed time from the application of the voltage to the occurrence of discharge (hereinafter, no-load time). Td pulse generator for generating a pulse signal corresponding to Td), (12) is Td
Td measuring device for measuring pulse width of pulse, (13) is T
d A discharge waveform classifier that is a classifying unit that generates an output signal that classifies each discharge pulse into three types of immediate discharge (D1), normal discharge (D2), and open (D3) based on the measurement result of the measuring device (12), (14), (15), and (16) are counters that count the signals output by the discharge waveform classifier (13) for each of the three types of groups, and (18) is (14), (1
5) and (16), the electrode feed control device that controls the electrode feed from the count number, (20) is (14), (15), (1
6) D1 / D2 (immediate discharge pulse number / normal discharge pulse number) is calculated from the count number of 6), which is a first calculator which is a first calculating means, and (21) temporarily calculates the calculated value of D1 / D2 A memory for storing, (22) calculates a ratio between the latest value of D1 / D2 calculated by the first calculator (20) and the previous value of D1 / D2 stored in the memory (21), A second calculator which is a calculation means, and (27) is a processing state determination means which determines whether the processing state is normal or abnormal from the ratio of D1 / D2 calculated by the second calculator (22). A state discriminator, (28), is a control device which is a control means for switching the pause time from the result of the machining state discriminator (27).
次にこの発明の実施例の動作を説明する。Next, the operation of the embodiment of the present invention will be described.
第1図において、従来例同様、Td計測器(12)はT
dパルス信号のパルス幅すなわち放電波形個々の無負荷
時間Tdを計測し、その結果から放電波形分類器(1
3)は各放電パルス個々を即放電(D1)、正常放電
(D2)、オープン(D3)の3種に分類した出力信号
を発生し、電極送り制御装置(18)はカウンタ(1
4),(15),(16)によりカウントされたD1,
D2,D3の頻度により電極サーボ送りを行うものであ
る。In FIG. 1, the Td measuring device (12) is T
The pulse width of the d pulse signal, that is, the no-load time Td of each discharge waveform is measured, and the discharge waveform classifier (1
3) generates an output signal in which each discharge pulse is classified into three types: immediate discharge (D1), normal discharge (D2), and open (D3), and the electrode feed control device (18) generates a counter (1
D1, counted by 4), (15), and (16)
The electrode servo feed is performed according to the frequency of D2 and D3.
一方、第1の計算器(20)は(14),(15),
(16)のカウント数D1,D2,D3からD1/D2
(即放電パルス数/正常放電パルス数)を計算する。第
2の計算器(22)は該D1/D2とメモリ(21)に
一旦記憶された前回のD1/D2との比率(以下単にD
1/D2の比率εと称す)を計算する。メモリ(21)
のデータは上記の計算が終了したのち新たなデータに更
新され、次の計算に用いられる。すなわち、第2の計算
器(22)により、 D1/D2の比率ε= (D1/D2)n/(D1/D2)n−1 がもとめられる。On the other hand, the first calculator (20) is (14), (15),
From the count numbers D1, D2, D3 of (16) to D1 / D2
Calculate (immediate discharge pulse count / normal discharge pulse count). The second calculator (22) calculates the ratio of the D1 / D2 to the previous D1 / D2 once stored in the memory (21) (hereinafter simply referred to as D
Calculate the ratio ε of 1 / D2). Memory (21)
The data of is updated to new data after the above calculation is finished and used for the next calculation. That is, the second calculator (22) finds the ratio ε = (D1 / D2) n / (D1 / D2) n-1 of D1 / D2.
第5図は、加工深さに対するD1/D2の比率εの変化
を電極送り条件が異なるものについて示したものである
が、加工深さが深くなるに従い両者ともD1/D2の比
率εが急激に上昇していることがわかる。これは、加工
深さが深くなるにつれて極間でのスラッジ排出能力が低
下するためにスラッジ濃度が上昇し、その結果として加
工が不安定となるためである。εの変化は非常に大きい
ため、電極送り条件などが異なる場合についても判別レ
ベルは同一に設定できる。また、εはD1/D2の微分
値に相当するためより早く加工状態の変化を判別でき
る。FIG. 5 shows changes in the ratio ε of D1 / D2 with respect to the working depth for different electrode feed conditions. As the working depth becomes deeper, the ratio ε of D1 / D2 sharply increases in both cases. You can see that it is rising. This is because as the working depth becomes deeper, the sludge discharge capability between the poles decreases and the sludge concentration increases, resulting in unstable working. Since the change of ε is very large, the discrimination level can be set to be the same even when the electrode feed conditions are different. Further, since ε corresponds to the differential value of D1 / D2, the change in the processing state can be discriminated earlier.
加工異常判別器(27)はεが所定のレベルを越えたか
どうかにより加工が異常か正常かを判別し、異常の場合
は休止時間を制御する制御装置(28)に信号を発し、
休止時間の自動切り換えを行う。即ち、加工状態が異常
である場合には、周知の休止時間制御、具体的には休止
時間を増大させてスラッジ生成量を少なくし、異常加工
を回避させる。The machining abnormality discriminator (27) discriminates whether the machining is abnormal or normal depending on whether ε exceeds a predetermined level, and when abnormal, issues a signal to the control device (28) which controls the down time,
Automatically switches the pause time. That is, when the machining state is abnormal, well-known downtime control, specifically, the downtime is increased to reduce the amount of sludge generation, thereby avoiding abnormal machining.
第7図に本制御のフローを示す。FIG. 7 shows the flow of this control.
第6図は休止時間が固定の場合と、この発明の自動制御
を行った場合において、加工時間と加工深さの関係を示
したものである。休止時間固定の場合は休止時間が小さ
いものほど加工速度は早いが、単位時間あたりのスラッ
ジ生成量が増大するため異常加工(加工不能)となる加
工深さが浅くなる。一方、この発明の自動制御を行った
ものについては異常加工に陥ることがなく、加工速度も
約15%増加している。FIG. 6 shows the relationship between the processing time and the processing depth when the down time is fixed and when the automatic control of the present invention is performed. When the down time is fixed, the shorter the down time is, the faster the machining speed is, but since the sludge generation amount per unit time increases, the machining depth that causes abnormal machining (machining impossible) becomes shallow. On the other hand, the automatic control of the present invention does not cause abnormal machining, and the machining speed is increased by about 15%.
なお、上記実施例においては電極送り制御をD1,D
2,D3の頻度により行う例を示したが、第2図に示す
ように極間平均電圧検出器(23)、A−D変換器(2
4)などを設けた構成として平均電圧制御による電極送
り制御としても良い。また、D1/D2の比率ではなく
D1/D2の差分を利用して制御を行っても同様の効果
を得ることができる。さらにD3の頻度が少ない場合に
はD3をD2に加えた2つの区分時間で処理を行っても
よい。In the above embodiment, the electrode feed control is set to D1, D
Although an example in which the frequency is set to 2 or D3 is shown, as shown in FIG. 2, the average voltage detector between electrodes (23) and the AD converter (2
4) and the like may be provided to control the electrode feed by the average voltage control. Further, the same effect can be obtained even if the control is performed using the difference of D1 / D2 instead of the ratio of D1 / D2. Further, when the frequency of D3 is low, the processing may be performed in two divided times in which D3 is added to D2.
[発明の効果] 以上のようにこの発明によれば、現在のD1/D2値と
前回のD1/D2値との比率または差分値により異常加
工を予測・判別し休止時間を自動的に切り換えるように
構成したため、異常加工が完全に回避でき、ひいてはき
わめて安定かつ効率の良い加工を行い得る放電加工装置
が得られる効果を奏する。[Effects of the Invention] As described above, according to the present invention, abnormal machining is predicted / determined based on the ratio or difference between the current D1 / D2 value and the previous D1 / D2 value, and the pause time is automatically switched. With this configuration, abnormal machining can be completely avoided, and an electric discharge machining apparatus capable of extremely stable and efficient machining can be obtained.
図1はこの発明の一実施例における放電加工装置の構成
を示す構成図、第2図はこの発明の他の実施例における
放電加工装置の構成を示す構成図、第3図は従来の放電
加工装置の構成を示す構成図、第4図は極間波形とTd
パルス信号の模式図、第5図は加工深さにD1/D2の
比率εの変化を示した図、第6図は休止時間固定の場合
と自動制御を行った場合における加工時間と加工深さの
関係を示した図、第7図はこの発明の一実施例における
制御フロー図である。 図において(1)は電極、(2)は被加工物、(3)は
Xクロステーブル、(4)はYクロステーブル、(5)
は加工電源、(6),(7),(8)はアクチュエー
タ、(9a),(9b),(9c)はサーボアンプ、
(10)は極間電圧検出回路、(11)はTdパルス発
生器、(12)はTdパルスのパルス幅を計測するTd
計測器、(13)は放電波形分類器、(14),(1
5),(16)はカウンタ、(18)は電極送り制御装
置、(20)は第1の計算器、(21)はメモリ、(2
2)は第2の計算器、(23)は極間平均電圧検出器、
(24)はA−D変換器、(27)は加工状態判別器、
(28)は制御装置である。 なお、図中、同一符号は同一、又は相当部分を示す。1 is a block diagram showing the structure of an electric discharge machine according to an embodiment of the present invention, FIG. 2 is a block diagram showing the structure of an electric discharge machine according to another embodiment of the present invention, and FIG. 3 is a conventional electric discharge machine. FIG. 4 is a configuration diagram showing the configuration of the apparatus, FIG.
5 is a schematic diagram of a pulse signal, FIG. 5 is a diagram showing changes in the ratio ε of D1 / D2 to the machining depth, and FIG. 6 is a machining time and machining depth when the down time is fixed and when automatic control is performed. 7 is a control flow chart in an embodiment of the present invention. In the figure, (1) is an electrode, (2) is a workpiece, (3) is an X cross table, (4) is a Y cross table, and (5).
Is a processing power source, (6), (7) and (8) are actuators, (9a), (9b) and (9c) are servo amplifiers,
(10) is an inter-electrode voltage detection circuit, (11) is a Td pulse generator, and (12) is Td for measuring the pulse width of the Td pulse.
Measuring instrument, (13) is discharge waveform classifier, (14), (1
5) and (16) are counters, (18) is an electrode feed controller, (20) is a first calculator, (21) is a memory, (2)
2) is the second calculator, (23) is the average voltage detector between poles,
(24) is an A-D converter, (27) is a processing state discriminator,
(28) is a control device. In the drawings, the same reference numerals indicate the same or corresponding parts.
Claims (1)
御されたパルス電圧を印加して該加工間隙に放電を発生
させ、繰り返し加工電波を供給することにより加工を行
う放電加工装置において、上記パルス時間幅を第1区分
時間T1、第2区分時間T2、第3区分時間T3に分類
する分類手段と、所定時間もしくは所定パルス数中にお
いて第1区分時間T1で発生する放電パルス数D1と第
2区分時間T2で発生する放電パルス数D2の比D1/
D2を所定時間毎に計算する計算手段と、現在のD1/
D2値と前回のD1/D2値の比率または差分値と基準
値とを比較し、その比率または差分値が基準値を超えた
場合に加工状態を異常として判断する加工状態判別手段
と、この加工状態判別手段より加工状態が異常である信
号が出力されたとき休止時間を増大させるように制御す
る制御手段とを備えてなる放電加工装置。1. An electric discharge machining apparatus which performs machining by applying a controlled pulse voltage to a machining gap in which an electrode and a workpiece are opposed to each other to generate an electric discharge in the machining gap and repeatedly supplying a machining radio wave. , A classifying means for classifying the pulse time width into a first segmented time T1, a second segmented time T2, and a third segmented time T3, and a discharge pulse number D1 generated in the first segmented time T1 within a predetermined time or a predetermined pulse number. And the ratio D1 / of the number D2 of discharge pulses generated in the second divided time T2
A calculation means for calculating D2 every predetermined time, and a current D1 /
Processing state determination means for comparing the ratio or difference value of the D2 value and the previous D1 / D2 value and the reference value, and determining the processing state as abnormal when the ratio or difference value exceeds the reference value, and this processing An electric discharge machining apparatus comprising: a control unit that controls to increase a pause time when a signal indicating that the machining state is abnormal is output from the state determination unit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1806887A JPH0659570B2 (en) | 1987-01-28 | 1987-01-28 | Electric discharge machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1806887A JPH0659570B2 (en) | 1987-01-28 | 1987-01-28 | Electric discharge machine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63185524A JPS63185524A (en) | 1988-08-01 |
JPH0659570B2 true JPH0659570B2 (en) | 1994-08-10 |
Family
ID=11961348
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1806887A Expired - Lifetime JPH0659570B2 (en) | 1987-01-28 | 1987-01-28 | Electric discharge machine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0659570B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE112012007204T5 (en) | 2012-12-06 | 2015-09-10 | Mitsubishi Electric Corporation | Electric discharge machining system |
-
1987
- 1987-01-28 JP JP1806887A patent/JPH0659570B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS63185524A (en) | 1988-08-01 |
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