JPS62152614A - Electric discharge machine - Google Patents
Electric discharge machineInfo
- Publication number
- JPS62152614A JPS62152614A JP29080785A JP29080785A JPS62152614A JP S62152614 A JPS62152614 A JP S62152614A JP 29080785 A JP29080785 A JP 29080785A JP 29080785 A JP29080785 A JP 29080785A JP S62152614 A JPS62152614 A JP S62152614A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- commercial
- output voltage
- power source
- electric discharge
- 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.)
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Links
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- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分腎〕
本発明は放電加工装置に関し、さらに詳しくほの加工電
流のピーク値を制御し得る放電加工装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Applications] The present invention relates to an electric discharge machining apparatus, and more particularly to an electric discharge machining apparatus capable of controlling the peak value of a machining current.
従来、この種の放電加工装置としては第６図のブロック
回路図に示すようなものがあっｔ：ｏ第６図において、
（１）は商用交流電源、（３）は商用交流電源（１）の
出力電圧を所定の大きさの直流電圧に変換する加工電源
、（４）は加工用電極、（５）は加工用電極（４）によ
って加工が施される被加工物、（６）は加工用電極（４
）を被加工物（５）に対して昇降させる電極駆動装置、
（７）は商用交流電源（１）の出力電圧を変圧する変圧
器、（８ａ）、（８ｂ）、（８Ｃ）、（８ｄ）、（８ｅ
）及び（８１）は変圧器（７）の出力電圧を整流する整
流器、（９）は整流された変圧器（７）の出力電圧から
交流成分を除去して直流電圧を出力する平滑用のコンデ
ンサ、（１０）は直流電圧を加工用電極（４）と被加工
物（５）とから構成される電極間に印加するためのスイ
・ソチンゲ素子、（１１）は電極間に流れる加工電流の
ピーク値を制限する電流制限用抵抗Ｍｇ、（Ｉ２）はス
イッチング素子（１０）をオン・オフ制御する発振制御
回路である。Conventionally, this type of electrical discharge machining apparatus has been shown in the block circuit diagram of Fig. 6. In Fig. 6,
(1) is a commercial AC power supply, (3) is a processing power supply that converts the output voltage of the commercial AC power supply (1) into a DC voltage of a predetermined size, (4) is a processing electrode, and (5) is a processing electrode. (4) is the workpiece to be processed, and (6) is the processing electrode (4).
) with respect to the workpiece (5);
(7) is a transformer that transforms the output voltage of the commercial AC power supply (1), (8a), (8b), (8C), (8d), (8e
) and (81) are rectifiers that rectify the output voltage of the transformer (7), and (9) is a smoothing capacitor that removes AC components from the rectified output voltage of the transformer (7) and outputs a DC voltage. , (10) is a Sui-Sotinge element for applying DC voltage between the electrodes consisting of the machining electrode (4) and the workpiece (5), and (11) is the peak of the machining current flowing between the electrodes. A current limiting resistor Mg (I2) that limits the value is an oscillation control circuit that controls on/off of the switching element (10).
次に、従来の放電加工装置の動作について、説明する。Next, the operation of the conventional electric discharge machining apparatus will be explained.
加工電源（３）は変圧器（７）が受電した商用交流電源
（１）の出力電圧を変圧して、所定の大きさの電圧に変
換して出力し、整流器（８ａ）〜（８ｆ）が変圧器（７
）の出力電圧を整流し、さらにコンデンサ（９）が整流
された出力電圧を平滑して所定の大ぎさの直流電圧を加
工電圧として出力する。コンデンサ（９）の出力する交
流電圧はスイッチング素子（１０）及び電流制限用抵抗
器（１１）を介して電極間に印加される。このとき、電
極駆動装置（６）は加工用電極（４）を被加工物（５）
に接近させて放電を生じさせ、加工電流を流して被加工
物（５）の放電加工を行わせる。The processing power source (3) transforms the output voltage of the commercial AC power source (1) received by the transformer (7), converts it into a predetermined voltage, and outputs it, and the rectifiers (8a) to (8f) Transformer (7
), the capacitor (9) smoothes the rectified output voltage, and outputs a DC voltage of a predetermined magnitude as a machining voltage. The AC voltage output from the capacitor (9) is applied between the electrodes via the switching element (10) and the current limiting resistor (11). At this time, the electrode drive device (6) moves the processing electrode (4) to the workpiece (5).
The workpiece (5) is brought close to generate electric discharge, and a machining current is applied to perform electric discharge machining of the workpiece (5).
ところで、商用交流電源（１）の出力電圧をｖＡ。 By the way, the output voltage of the commercial AC power supply (1) is vA.
比例定数をＫとすると、加工電圧ｖＥはＶＥ ＝ＫＸＶ
Ａ
となる。このとき、加工電流のピーク値をＩＰに選ぶと
、放電中の電極間アーク電圧はＶＤであるので、電流制
限用抵抗器（１１）の抵抗値ＲζよＩＰ
となる。If the proportionality constant is K, the machining voltage vE is VE = KXV
It becomes A. At this time, if the peak value of the machining current is selected as IP, since the arc voltage between the electrodes during discharge is VD, the resistance value Rζ of the current limiting resistor (11) becomes IP.
商用交流電源（１）の出力電圧ＶＡが変動してｖＡ’＝
ｖＡ＋ΔｖＡ
になると、加工電圧ｖＥは
Ｖ Ｅ’ ＝ Ｋ Ｘ Ｖ Ａ’
となる。このため、電極間に流れる加工電流のピーク値
■Ｐｊは放電中の電極間アーク電圧がｖＤであるので、
ＲＲ
となる。The output voltage VA of the commercial AC power supply (1) fluctuates and becomes vA'=
When it becomes vA+ΔvA, the machining voltage vE becomes V E' = K X V A'. Therefore, the peak value ■Pj of the machining current flowing between the electrodes becomes RR since the arc voltage between the electrodes during discharge is vD.
従って、商用交流電源（１）の出力電圧ｖＡが変動する
と、加工電流のピーク値ＩＰも変動することになる。こ
の結宋放電加工を行っても、所定の面粗さが得られなく
なるとともに、加工速度が低下し、加工特性が悪化する
という問題があった。Therefore, when the output voltage vA of the commercial AC power supply (1) fluctuates, the peak value IP of the machining current also fluctuates. Even if this electrical discharge machining is performed, there are problems in that a predetermined surface roughness cannot be obtained, the machining speed decreases, and machining characteristics deteriorate.
第７図は商用交流電源（１）の出力電圧ＶＡの変動の影
響を少なくした従来の放電加工装置のブロック回路図で
ある。なお、第７図において、第６図と同様の機能を果
す部分については同一の符号を付し、その説明は省略す
る。この放電加工装置は商用交流電源（１）と加工電源
（３）との間に定電圧装置（２）が取り付けられており
、商用交流電源（１）の出力電圧ＶＡの変動の影響を低
減する。FIG. 7 is a block circuit diagram of a conventional electric discharge machining apparatus that reduces the influence of fluctuations in the output voltage VA of the commercial AC power supply (1). In FIG. 7, parts that perform the same functions as those in FIG. 6 are denoted by the same reference numerals, and their explanation will be omitted. This electric discharge machining device has a constant voltage device (2) installed between the commercial AC power source (1) and the machining power source (3), which reduces the influence of fluctuations in the output voltage VA of the commercial AC power source (1). .
しかし、定電圧装置（２）を取り付けると装置が大型化
し、高価になるという問題があった。However, when the constant voltage device (2) is attached, the device becomes larger and more expensive.
本発明は上記問題点を解決する。ためになされたもので
、商用交流電源の出力電圧が変動しても、加工電流のピ
ーク値が選択された大きさを維持して、放電加工の加工
特性が悪化せずに、経済的な放電加工装置を提供するこ
とを目的とする。The present invention solves the above problems. Even if the output voltage of the commercial AC power supply fluctuates, the peak value of the machining current maintains the selected magnitude, and the machining characteristics of electrical discharge machining do not deteriorate, resulting in economical electrical discharge machining. The purpose is to provide processing equipment.
そこて本発明では、商用交流電源の出力電圧を整流、平
滑して直流電圧を出力する加工電源と、発振制御回路に
よりオン・オフ制御され、直流電圧を出力するスイッチ
ング素子と、電流制限用可変抵抗器と、加工用Ｔｓ 極
と加工用Ｍ％に所定の間隔を隔てて設けられた被加工物
とから構成されろ電極と、商用交流電源の出力電圧に対
応する電圧をデジタル電圧に変換するアナログ・デジタ
ル変換器と、このデジタル電圧に基づいて電極間に流れ
る加工電流のピーク値が予め選択されたピーク値となる
ように電流制限用可変抵抗器の抵抗値を補正する抵抗制
御回路とから放電加工装置を構成する。Therefore, the present invention includes a processed power supply that rectifies and smoothes the output voltage of a commercial AC power supply to output a DC voltage, a switching element that is controlled on and off by an oscillation control circuit and outputs a DC voltage, and a variable current limiter. It consists of a resistor, a workpiece provided at a predetermined interval between the machining Ts pole and the machining M% electrode, and converts the voltage corresponding to the output voltage of the commercial AC power source into a digital voltage. An analog-to-digital converter and a resistance control circuit that corrects the resistance value of the current limiting variable resistor so that the peak value of the machining current flowing between the electrodes is a preselected peak value based on this digital voltage. Configure electrical discharge machining equipment.
上記構成の放電加工装置は、アナログ・デジタル変換器
が商用交流電源の出力電圧に対応する出力電圧をデジタ
ル電圧に変換し、抵抗制御回路がこのデジタル電圧に基
づいて、ｒｉ電極間流れる加工電流のピーク値が予め選
択されたピーク値となるように電流制限用可変抵抗器の
抵抗値を補正する。In the electrical discharge machining apparatus having the above configuration, the analog-to-digital converter converts the output voltage corresponding to the output voltage of the commercial AC power supply into a digital voltage, and the resistance control circuit controls the machining current flowing between the ri electrodes based on this digital voltage. The resistance value of the current limiting variable resistor is corrected so that the peak value becomes a preselected peak value.
以下、本発明の一実施例を添付図面を参照して詳細に説
明する。Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.
第１図は本発明に係る放電加工装置の概略図である。第
１図において、（１）は商用交流電源、（３）は商用交
流電源（１１の出力電圧を所定の大きさの直流電圧に変
換する加工電源、（４）は加工用電極、（５）は加工用
電極（４）によって加工が施される被加工物、（６）は
加工用電極（４）を被加工物（５）に対して昇降させろ
電極駆動装置、（７）は商用文Ｕ＆電源（１）の出力電
圧を変圧する変圧器、（８ａ）、（８ｂ）、（８Ｃ）、
（８ｄ）、（８ｅ）及び（８ｆ）は変圧器（７）の出力
電圧をｙ！流する整流器、（９）は整流された変圧器（
７）の出力電圧の交流成分を除去して直流電圧を出力す
る平滑用のコンデンサ、（１０）は直流電圧を加工用電
極（４）と被加工物（５）とから構成される電極間に印
加するためのスイッチング素子、（１２）はスイッチン
グ素子（１０）をオン・オフ制御する発振制御回路、（
１３）は電極間に流れる加工電流のピーク値制限する電
流制限用可変抵抗器、（１４）は商用交流電源の出力電
圧をデジタル電圧に変換するアナログ・デジタル変換回
路、（Ｉｓ）はアナログ・デジタル変換回路（１４）の
出力電圧に基づいて、電流制限用可変抵抗器（１３）の
抵抗値を制御する抵抗制御回路である。FIG. 1 is a schematic diagram of an electric discharge machining apparatus according to the present invention. In Figure 1, (1) is a commercial AC power supply, (3) is a commercial AC power supply (a machining power supply that converts the output voltage of 11 into a DC voltage of a predetermined size, (4) is a machining electrode, and (5) is a commercial AC power supply. (6) is an electrode drive device for raising and lowering the machining electrode (4) relative to the workpiece (5); (7) is a commercial text U& Transformers that transform the output voltage of the power source (1), (8a), (8b), (8C),
(8d), (8e) and (8f) represent the output voltage of transformer (7) y! (9) is a rectified transformer (
7) is a smoothing capacitor that removes the AC component of the output voltage and outputs DC voltage; A switching element for applying voltage, (12) an oscillation control circuit for controlling on/off of the switching element (10), (
13) is a current limiting variable resistor that limits the peak value of the machining current flowing between the electrodes, (14) is an analog-to-digital conversion circuit that converts the output voltage of a commercial AC power supply into a digital voltage, and (Is) is an analog-to-digital converter. This is a resistance control circuit that controls the resistance value of the current limiting variable resistor (13) based on the output voltage of the conversion circuit (14).
第２図は第１図に示した電流制限用可変抵抗器（］３）
の回路図である。電流制限用可変抵抗器（１３）は複数
の抵抗Ｒ１、Ｒ２、・、ＲＮが並列に接続されており、
各抵抗Ｒ１、Ｒ２、、ＲＮに抵抗制御回路（１５）によ
ってオン・オフ制御されるスイッチング素子Ｓ１、Ｓ２
１、ＳＮが直列に接続されている。Figure 2 shows the current limiting variable resistor (]3) shown in Figure 1.
FIG. The current limiting variable resistor (13) has a plurality of resistors R1, R2, . . . RN connected in parallel,
Switching elements S1, S2 are controlled on/off by a resistance control circuit (15) for each resistor R1, R2, RN
1. SN are connected in series.
次に、本発明に係る放電加工装置の全体の動作について
説明する。加工電源（３）は変圧器（７）が受電した商
用交流電源（１）の出力電圧を変圧して、所定の大きさ
の電圧に変換して出力し、整流器（８ａ）〜（８［）が
変圧器（７１の出力電圧を整流し、さらにコンデンサ（
９）が整流された出力電圧を平滑して所定の大きさの直
流電圧ｖＥを出力する。なお、直流電圧ＶＥは商用交流
電源（１）の出力電圧をＶＡ、比例定数をＫとすると、
ＶＥ＝ＫＸＶＡ
となる。コンデンサ（９）の出力する交流電圧はスイッ
チング素子（１０）及び電流制限用可変抵抗器（１１）
を介して電極間に印加される。このとき、電極駆動装置
（６）は加工用電極（４）を被加工物（５）に接近させ
て放電を生じさせ、加工電流を流して被加工物（５）の
放電加工を行わせる。Next, the overall operation of the electrical discharge machining apparatus according to the present invention will be explained. The processing power source (3) transforms the output voltage of the commercial AC power source (1) received by the transformer (7), converts it into a voltage of a predetermined size, and outputs the voltage, and rectifiers (8a) to (8[) The transformer (71) rectifies the output voltage, and the capacitor (
9) smoothes the rectified output voltage and outputs a DC voltage vE of a predetermined magnitude. Note that the DC voltage VE is expressed as VE=KXVA, where VA is the output voltage of the commercial AC power supply (1) and K is the proportionality constant. The AC voltage output from the capacitor (9) is connected to the switching element (10) and the current limiting variable resistor (11).
is applied between the electrodes via. At this time, the electrode drive device (6) brings the machining electrode (4) close to the workpiece (5) to generate electric discharge, and causes the machining current to flow to perform electric discharge machining on the workpiece (5).
一方、抵抗制御回路（１５）は電源投入時に電流制限用
可変抵抗器（１１）の抵抗値をＲに初期設定し、放電加
工時に電極間に流れる加工電流のピーク値を■に選択す
る。放電中の電極間アーク電圧をＶＤとすると、加工電
流のピーク値をＩＰは、となる。又、アナログ・デジタ
ル変換器（１４）は商用交流Ｔｓ源（１）の出力電圧Ｖ
Ａをプレタル電圧に変換して出力しており、抵抗制御回
路（１５）がこれを常時監視している。抵抗制御回路（
１５）は商用交流電源（１）の出力電圧ＶＡが
■Ａ′＝ｖΔ±ΔＶΔ
に変動すると、選択した加工電流のピーク値ＩＰを維持
するために、電流制限用可変抵抗器（１１）の抵抗値を
ＲからＲ′に変化させる。ここで、抵抗値Ｒ′は放電中
のアーク電圧がＶＤであるので、Ｉ
Ｉとなる。この結果、加工電流のピ
ーク値ＩＰｌはＫｘＶ八 〜ｖｎ
ＩＰ’＝ −＝Ｉｐとなす、２択
した加工電流のピーク値に維持される。On the other hand, the resistance control circuit (15) initializes the resistance value of the current limiting variable resistor (11) to R when the power is turned on, and selects the peak value of the machining current flowing between the electrodes during electric discharge machining to ■. When the arc voltage between the electrodes during discharge is VD, the peak value of the machining current is IP. Further, the analog-to-digital converter (14) converts the output voltage V of the commercial AC Ts source (1)
A is converted into a pretal voltage and output, and a resistance control circuit (15) constantly monitors this. Resistance control circuit (
15) When the output voltage VA of the commercial AC power supply (1) fluctuates to ■A'=vΔ±ΔVΔ, the resistance of the current limiting variable resistor (11) is changed in order to maintain the peak value IP of the selected machining current. Change the value from R to R'. Here, since the arc voltage during discharge is VD, the resistance value R' is I
Becomes I. As a result, the peak value IPl of the machining current is maintained at the peak value of the two selected machining currents, which is KxV8~vnIP'=-=Ip.
次に、第３図、第４図及び第５図は本発明に係る放電加
工装置の他の実施例であり、主要部分の７１１を示した
ものである。なお、第３図、第４図及び第５図において
、それぞれ第１図と同様の機能を果す部分については同
一の符号を付し、その説明は省略する。上記実施例では
、アナログ・デジタノ［変換回路（］４）は商用交流電
源ｆｌ）の出力電圧ｖＡをデジタル電圧に変換したが、
第３図に示した実施例では変圧器（７）の出力電圧を、
？ｊｖＪ４図に示した実施例ではコンデンサ（９）の出
力電圧を、又第５図に示した実施例では電流制限用可変
抵抗器（１３）の出力電圧をそれぞれデジタル電圧に変
換している。Next, FIGS. 3, 4, and 5 show other embodiments of the electrical discharge machining apparatus according to the present invention, and show the main part 711. Note that in FIGS. 3, 4, and 5, parts that perform the same functions as in FIG. 1 are designated by the same reference numerals, and explanations thereof will be omitted. In the above embodiment, the analog/digital conversion circuit (4) converts the output voltage vA of the commercial AC power supply fl) into a digital voltage.
In the embodiment shown in FIG. 3, the output voltage of the transformer (7) is
? In the embodiment shown in FIG. jvJ4, the output voltage of the capacitor (9) is converted into a digital voltage, and in the embodiment shown in FIG. 5, the output voltage of the current limiting variable resistor (13) is converted into a digital voltage.
以上説明したように本発明によれば、商用交流電源の出
力電圧に対応する電圧に基づいて、商用交流電源の出力
電圧の変動を検出し、加工電流のピーク値を予め選択さ
れた値に維持するようにしたので、放電加工の加工特性
が劣化するのを防げろという効果を得る。）As explained above, according to the present invention, fluctuations in the output voltage of a commercial AC power source are detected based on the voltage corresponding to the output voltage of the commercial AC power source, and the peak value of the machining current is maintained at a preselected value. As a result, it is possible to prevent the machining characteristics of electric discharge machining from deteriorating. )
第１図は本発明に係る放電加工装置のブロック回路図、
第２図は第１図に示した電流制限用可変抵抗器の回路図
、第３図、第４図、第５図は本発明に係る放電加工装置
の他の実施例を示すプロ、ツク回路図、第６図、第７図
は従来の放電加工装置のブロック回路図である。
各図中、１は商用交流電源、３は加工電源、４は加工用
電極、５は被加工物、６は電極駆動装置、７は変圧器、
８ａ、 ８ｂ、 ８ｃ、 ８ｄ、 ８ｅ、 ８ｆは整流
器、９はコンデンサ、１０はスイッチング素子、１２は
発振制御回路、１３は電流制限用可変抵抗器、１４はア
ナログ・デジタル変換回路、１５は抵抗制御回路である
。
なお、各図中同一符号は同−又；よ相当部分を示すもの
である。FIG. 1 is a block circuit diagram of an electric discharge machining apparatus according to the present invention,
FIG. 2 is a circuit diagram of the current limiting variable resistor shown in FIG. 1, and FIGS. 3, 4, and 5 are professional circuits showing other embodiments of the electrical discharge machining apparatus according to the present invention. 6 and 7 are block circuit diagrams of conventional electrical discharge machining equipment. In each figure, 1 is a commercial AC power supply, 3 is a processing power supply, 4 is a processing electrode, 5 is a workpiece, 6 is an electrode drive device, 7 is a transformer,
8a, 8b, 8c, 8d, 8e, 8f are rectifiers, 9 is a capacitor, 10 is a switching element, 12 is an oscillation control circuit, 13 is a current limiting variable resistor, 14 is an analog-to-digital conversion circuit, and 15 is a resistance control circuit. It is a circuit. Note that the same reference numerals in each figure indicate the same or equivalent parts.
Claims (5)
圧を出力する加工電源、発振制御回路によりオン・オフ
制御されるスイッチング素子及び電流制限用可変抵抗器
からなる直列回路を加工用電極に接続し、該加工用電極
と所定の間隔を隔てて設けられた被加工物とから構成さ
れる電極間に放電を生じさせて、該被加工物を放電加工
する放電加工装置において、前記商用交流電源の出力電
圧に対応する電圧をデジタル電圧に変換するアナログ・
デジタル変換器と、前記デジタル電圧に基づいて前記電
極間に流れる加工電流のピーク値が予め選択されたピー
ク値となるように前記電流制限用可変抵抗器の抵抗値を
補正する抵抗制御回路とを備えたことを特徴とする放電
加工装置。(1) A processing power supply that rectifies and smoothes the output voltage of a commercial AC power supply to output a DC voltage, a series circuit consisting of a switching element controlled on/off by an oscillation control circuit, and a current limiting variable resistor as a processing electrode. In the electric discharge machining apparatus, the electric discharge machining apparatus performs electric discharge machining on the workpiece by generating an electric discharge between the electrodes connected to the machining electrode and the workpiece provided at a predetermined interval. An analog converter that converts the voltage corresponding to the output voltage of an AC power supply into a digital voltage.
a digital converter; and a resistance control circuit that corrects the resistance value of the current limiting variable resistor so that the peak value of the machining current flowing between the electrodes becomes a preselected peak value based on the digital voltage. An electrical discharge machining device characterized by:
整流をされる特許請求の範囲第１項記載の放電加工装置
。(2) The electric discharge machining apparatus according to claim 1, wherein the output voltage of the commercial AC power source is transformed and then rectified.
抗値を初期設定する機能を有している特許請求の範囲第
１項記載の放電加工装置。(3) The electric discharge machining apparatus according to claim 1, wherein the resistance control circuit has a function of initially setting the resistance value of the current limiting variable resistor.
加工電源が該商用交流電源の出力電圧を変圧した電圧で
ある特許請求の範囲第１項記載の放電加工装置。(4) The electric discharge machining apparatus according to claim 1, wherein the voltage corresponding to the output voltage of the commercial AC power source is a voltage obtained by transforming the output voltage of the commercial AC power source by the machining power source.
加工電源が該商用交流電源の出力電圧を整流した電圧で
ある特許請求の範囲第１項記載の放電加工装置。(5) The electric discharge machining apparatus according to claim 1, wherein the voltage corresponding to the output voltage of the commercial AC power source is a voltage obtained by rectifying the output voltage of the commercial AC power source by the machining power source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29080785A JPS62152614A (en) | 1985-12-25 | 1985-12-25 | Electric discharge machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29080785A JPS62152614A (en) | 1985-12-25 | 1985-12-25 | Electric discharge machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62152614A true JPS62152614A (en) | 1987-07-07 |
| JPH0478409B2 JPH0478409B2 (en) | 1992-12-11 |
Family
ID=17760739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29080785A Granted JPS62152614A (en) | 1985-12-25 | 1985-12-25 | Electric discharge machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62152614A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0349824A (en) * | 1989-04-11 | 1991-03-04 | Mitsubishi Electric Corp | Power source for electric discharge |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5754257A (en) * | 1980-09-18 | 1982-03-31 | Shigekado Sakakibara | Heat treatment of aluminum alloy cast |
| JPS5810425A (en) * | 1981-07-14 | 1983-01-21 | Makino Milling Mach Co Ltd | Control system of processing pulse current for discharge processing device |
-
1985
- 1985-12-25 JP JP29080785A patent/JPS62152614A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5754257A (en) * | 1980-09-18 | 1982-03-31 | Shigekado Sakakibara | Heat treatment of aluminum alloy cast |
| JPS5810425A (en) * | 1981-07-14 | 1983-01-21 | Makino Milling Mach Co Ltd | Control system of processing pulse current for discharge processing device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0349824A (en) * | 1989-04-11 | 1991-03-04 | Mitsubishi Electric Corp | Power source for electric discharge |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0478409B2 (en) | 1992-12-11 |
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