JPS6119372B2 - - Google Patents
Info
- Publication number
- JPS6119372B2 JPS6119372B2 JP6725779A JP6725779A JPS6119372B2 JP S6119372 B2 JPS6119372 B2 JP S6119372B2 JP 6725779 A JP6725779 A JP 6725779A JP 6725779 A JP6725779 A JP 6725779A JP S6119372 B2 JPS6119372 B2 JP S6119372B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- machining
- workpiece
- movement
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000003754 machining Methods 0.000 claims description 44
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 101100423825 Arabidopsis thaliana SYP61 gene Proteins 0.000 description 1
- 101150096276 HOG1 gene Proteins 0.000 description 1
- 102100039929 Intraflagellar transport protein 172 homolog Human genes 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009760 electrical discharge machining Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 101150078678 osm-1 gene Proteins 0.000 description 1
Landscapes
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Description
【発明の詳細な説明】
本発明は、電極が被加工物に押し込まれる方向
に送られる動きを与える装置と共に、上記方向に
垂直な方向の要素を持つた動きを与える装置とを
備えた放電加工装置の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electric discharge machining method that includes a device that provides a movement in which an electrode is sent in a direction in which it is pushed into a workpiece, and a device that provides a movement that has an element in a direction perpendicular to the above direction. This relates to improvements in equipment.
従来放電加工においては、電極が被加工物に押
し込まれる方向に電極と被加工物に相対的な動き
を与え、通常その方向に対して上記電極と被加工
物との距離が一定になるようにサーボを取りなが
ら加工を行なつている。ここで、通常放電加工に
おいては、荒加工の後、同様な形状でかつ若干寸
法の異なる複数の電極を用いて仕上加工を行なつ
ていた。これは、荒加工においては加工速度は高
いが加工面が荒く、一方仕上加工においては加工
面は細かいが加工速度が低く、また電極と被加工
物との側面ギヤツプは仕上加工の方が狭いことに
起因している。そのため一本の電極で荒加工から
仕上加工まで加工する目的で、荒加工が終了した
後、電極あるいは被加工物に通常の送り方向と垂
直な要素を持つた動き、例えば公転円運動を与え
見掛上寸法が大きい電極を用いたと同様に、荒加
工に使用した電極で仕上加工も行なう装置が考案
されている。 Conventionally, in electrical discharge machining, relative movement is applied to the electrode and the workpiece in the direction in which the electrode is pushed into the workpiece, and the distance between the electrode and the workpiece is usually kept constant in that direction. Machining is carried out while using the servo. Here, in normal electric discharge machining, after rough machining, finishing machining is performed using a plurality of electrodes having the same shape but slightly different dimensions. This is because in rough machining, the machining speed is high but the machined surface is rough, while in finishing machining the machined surface is fine but the machining speed is low, and the side gap between the electrode and the workpiece is narrower in finishing machining. This is caused by Therefore, in order to perform machining from rough machining to finishing machining with a single electrode, after rough machining is completed, the electrode or workpiece is given a movement with an element perpendicular to the normal feed direction, such as an orbital circular motion. In the same way that an electrode with a large hanging dimension is used, an apparatus has been devised in which the electrode used for rough machining is also used to perform finishing machining.
これは例えば第１図に示すようなもので、電極
１と被加工物２を絶縁液中で対向させ、パルス電
流供給装置３より供給されるパルス電流を加工間
隙に通電することにより、被加工物２を加工す
る。その時電極１は、電圧差動回路４、増巾器５
からなるサーボ回路及び該回路の出力信号により
駆動される油圧サーボバルブ６、油圧シリンダ７
からなるサーボ機構により、被加工物２に対して
押し込まれる方向（Ｚ軸方向）に、例えば加工間
隙の電圧Vdが平均的に基準値Vsと一致する様
に、送り込まれ加工が進行する。ここで最終所望
深さより少し手前に設定された深さまで荒加工が
終了した後、パルス電流供給装置３の１パルスの
エネルギーを小さくなる様に変更し、更に電極運
動制御装置８により、既知の方法でサーボモータ
９，１０を動かすことにより、Ｘ−Ｙクロステー
ブル１１，１２に連続して、例えば円運動を行な
わせる。この場合サーボモータ９，１０には位相
がπ/2異なり、振巾は上記荒加工と仕上加工の側
面ギヤツプの差の分に対応する電圧を有する正弦
波を加えれば良い。そして、この様に電極１と被
加工物２を相対的に公転円運動させながら、再度
所望深さまで加工を行なう。この場合、相対的な
公転円運動の直径に当る寸法だけ電極１が拡大さ
れたのと等価な効果を持つため、先に行つた荒加
工による荒い加工面は除去されるというものであ
る。 This is, for example, as shown in Fig. 1, in which an electrode 1 and a workpiece 2 are placed opposite each other in an insulating liquid, and a pulsed current supplied from a pulsed current supply device 3 is applied to the machining gap. Process object 2. At that time, the electrode 1 is connected to the voltage differential circuit 4, the amplifier 5
A servo circuit consisting of a hydraulic servo valve 6 and a hydraulic cylinder 7 driven by the output signal of the circuit.
A servo mechanism consisting of the following servo mechanism advances the workpiece 2 in the pushing direction (Z-axis direction) such that, for example, the voltage Vd of the machining gap matches the reference value Vs on average. After the rough machining is completed to a depth set slightly before the final desired depth, the energy of one pulse of the pulse current supply device 3 is changed to be smaller, and the electrode motion control device 8 is further controlled by a known method. By moving the servo motors 9 and 10, the X-Y cross tables 11 and 12 are caused to continuously perform, for example, a circular motion. In this case, it is sufficient to apply a sine wave to the servo motors 9 and 10 having a phase difference of π/2 and a voltage having an amplitude corresponding to the difference in side gap between rough machining and finishing machining. Then, while the electrode 1 and the workpiece 2 are relatively orbiting in a circular motion in this manner, processing is performed again to a desired depth. In this case, the effect is equivalent to expanding the electrode 1 by a dimension corresponding to the diameter of the relative orbital circular motion, so that the rough machined surface caused by the previous rough machining is removed.
ここで、この方法で第２図に示す様な楕円断面
を有する電極１を用いて、それに対応する穴を被
加工物２上に加工する場合、公転円運動の軌跡の
各部分に対して被加工物２が除去されるべき量
は、電極１が大きな曲率半径を有している部分で
は、小さな曲率半径を有している部分に比べて非
常に大きい。そのため加工が進行するにつれて、
その曲率半径の大きい部分の加工された深さと、
曲率半径の小さな部分の加工された深さとが、第
３図に示す様に大きな差を持つてくる。 Here, when using this method to machine a corresponding hole on the workpiece 2 using the electrode 1 having an elliptical cross section as shown in FIG. The amount of workpiece 2 to be removed is much greater where the electrode 1 has a large radius of curvature compared to where it has a small radius of curvature. Therefore, as processing progresses,
The processed depth of the part with a large radius of curvature,
As shown in FIG. 3, there is a large difference in the processed depth of the portion with a small radius of curvature.
そのため、この装置においては、深穴の加工に
なると、先に行なつた荒加工による荒い加工面を
十分取り切ることができないし、仕上加工の際の
電極の到達する深さが、電極の形状によつて各部
分毎に差ができるという大きな欠点を有してい
る。 Therefore, when machining deep holes with this device, the rough machined surface from the previous rough machining cannot be sufficiently removed, and the depth that the electrode reaches during finishing machining depends on the shape of the electrode. This has a major drawback in that there are differences between each part.
本発明は上記欠点に鑑みてなされたもので、電
極がある所定の加工深さに達した後、電極がその
所定加工深さにある時間が、所定の時間持続した
ことを検出することにより、電極の全ての部分に
対して十分所定加工深さまで加工が完了したこと
を検知し、仕上加工精度の向上を計ることを目的
とするものである。 The present invention has been made in view of the above-mentioned drawbacks, and by detecting that the electrode has remained at the predetermined processing depth for a predetermined period of time after the electrode has reached a predetermined processing depth, The purpose of this is to detect that machining has been completed to a sufficient predetermined machining depth on all parts of the electrode, and to improve the accuracy of finishing machining.
第４図は、本発明装置の一実施例で、電極運動
制御装置８よりの信号により、サーボモータ９，
１０を駆動することにより、Ｘ−Ｙクロステーブ
ル１１，１２を動作させ、電極１と被加工物２と
の間に相対的に公転円運動を与えることは、第１
図に示す従来装置と同様である。 FIG. 4 shows an embodiment of the device of the present invention, in which the servo motor 9,
The first step is to operate the X-Y cross tables 11 and 12 by driving the electrode 10 and to give relative orbital circular motion between the electrode 1 and the workpiece 2.
This is similar to the conventional device shown in the figure.
また差動トランス１３のコイルの部分は機械の
固定側に固定されていると共に、その可動鉄心は
Ｚ軸方向に対して電極１と同様な動きをするよう
に構成されており、また１４は、例えば特公昭53
−32112号公報の第１図１２と同様の回路で、加
工間隙の電圧Vdと基準電圧との差電圧Vd−Vs
と、差動トランス１３との出力のうち、低い方を
優先的に選択するための比較選択回路である。こ
こで該比較選択回路１４の動作は、上記特公昭53
−32112号公報中に詳述してある如く、機械の固
定側に固定された差動トランス１３のコイル部の
位置をあらかじめ設定しておけば、その設定位置
より上では加工間隙での電圧Vdと基準電圧Vsと
の差電圧Vd−Vsにより電極１の位置は制御さ
れ、また上記設定位置にくれば、差動トランス１
３の出力が優先的に選択されることにより、サー
ボバルブ６と油圧シリンダ７からなるサーボ機構
によつて、その位置以下には電極１が降下しない
様に制御するものである。 Further, the coil portion of the differential transformer 13 is fixed to the fixed side of the machine, and its movable core is configured to move in the same manner as the electrode 1 in the Z-axis direction. For example, special public service in Showa 53
A circuit similar to Figure 12 of Publication No.-32112, the difference voltage Vd-Vs between the voltage Vd of the machining gap and the reference voltage.
This is a comparison selection circuit for preferentially selecting the lower one of the outputs of the differential transformer 13 and the differential transformer 13. Here, the operation of the comparison and selection circuit 14 is as follows.
As detailed in Publication No. 32112, if the position of the coil part of the differential transformer 13 fixed to the fixed side of the machine is set in advance, the voltage Vd in the machining gap will be higher than the set position. The position of the electrode 1 is controlled by the voltage difference Vd-Vs between the voltage and the reference voltage Vs, and when the electrode 1 reaches the set position, the differential transformer 1
By preferentially selecting the output No. 3, the servo mechanism consisting of the servo valve 6 and the hydraulic cylinder 7 controls the electrode 1 so that it does not fall below that position.
次にこの実施例の装置の動作は、電極１が差動
トランス１３により設定される所定位置より上に
ある状態で、加工が進行している際には、差動ト
ランス１３の出力は、比較器１５により比較電圧
ＶBと比較されており、またその比較の結果比較
電圧の方が低いため、比較器１５の出力は零を保
つ。 Next, the operation of the apparatus of this embodiment is such that when the electrode 1 is above the predetermined position set by the differential transformer 13 and the machining is in progress, the output of the differential transformer 13 is Since the comparison voltage V B is compared with the comparison voltage V B by the comparator 15, and as a result of the comparison, the comparison voltage is lower, the output of the comparator 15 remains zero.
ここで、もつと加工が進行し、電極１が設定加
工位置に達すると、差動トランス１３の出力が比
較器１５の比較電圧ＶB以下になり、該比較器１
５の出力は１になる。すると単安定マルチバイブ
レータ（以下OSMと記す）１６は、所定の時間
だけ作動し、このOSM１６の出力は１になり反
転素子１７を通して、ANDゲート１８を閉じ
る。ここで電極１が設定加工位置に達した初期の
段階にいては、電極１の形状により、被加工物２
上の加工穴の深さにはムラがあり、上記OSM１
６の作動時間中に、電極１は上方へ移動し、比較
器１５の出力は零になつてしまう。このため
ANDゲート１８の出力は零の状態を保つ。この
様にしてある時間経つと、上記加工穴の加工深さ
のムラがなくなつていることにより、電極１は設
定加工位置に留まる時間は徐々に長くなつてく
る。そしてその時間がOSM１６の作動時間を越
えると、ANDゲート１８の出力は１になり、パ
ルス電流発生装置３に加工終了信号として作用
し、一連の動作は終了する。 Here, as the machining progresses and the electrode 1 reaches the set machining position, the output of the differential transformer 13 becomes lower than the comparison voltage V B of the comparator 15, and the comparator 1
The output of 5 becomes 1. Then, the monostable multivibrator (hereinafter referred to as OSM) 16 operates for a predetermined time, and the output of this OSM 16 becomes 1, passes through the inverting element 17, and closes the AND gate 18. At the initial stage when the electrode 1 reaches the set machining position, the shape of the electrode 1 causes the workpiece to
The depth of the upper machined hole is uneven, and the above OSM1
6, the electrode 1 moves upwards and the output of the comparator 15 becomes zero. For this reason
The output of AND gate 18 remains at zero. After a certain period of time has elapsed in this way, the time during which the electrode 1 remains at the set machining position gradually becomes longer due to the unevenness in the machining depth of the machining holes being eliminated. When that time exceeds the operating time of the OSM 16, the output of the AND gate 18 becomes 1, which acts as a machining end signal to the pulse current generator 3, and the series of operations ends.
このように上記単安定マルチバイブレータ１６
を十分な時間作動するように設定しておけば、電
極１の一部が所望する加工深さに達してから、被
加工物上の加工されずに残つた部分を全て加工す
ることができるため、荒加工後、仕上加工を行な
う場合にも荒加工面が残ることはなく、また仕上
加工精度も向上させることができる。 In this way the above monostable multivibrator 16
If set to operate for a sufficient period of time, after part of the electrode 1 reaches the desired machining depth, all the remaining unmachined parts of the workpiece can be machined. Even when finishing is performed after rough machining, no rough-machined surfaces remain, and finishing accuracy can also be improved.
ここで、上記実施例においては、差動トランス
１３の位置を加工前に所望する加工深さの位置に
設定し、その位置での電極運動時間を設定するよ
うにしたが、加工中上記差動トランス１３の位置
を段階的に移動させることも可能であり、その場
合、設定された電極運動時間は、その段階毎に、
電極が公転運動する時間を示すことはもちろんで
ある。また上記実施例中においては、公転運動形
状を円としたが、その他の形状の運動を行なわせ
た場合にも本発明が適用できることは当然であ
る。 Here, in the above embodiment, the position of the differential transformer 13 is set to the position of the desired machining depth before machining, and the electrode movement time at that position is set. It is also possible to move the position of the transformer 13 in steps, in which case the set electrode movement time is
Of course, it also indicates the time during which the electrode revolves. Further, in the above embodiments, the shape of the revolution movement is circular, but it is obvious that the present invention can be applied to cases where movement of other shapes is performed.
第１図は従来装置説明図、第２図、第３図は楕
円電極による加工状態説明図、第４図は本発明装
置説明図である。なお、図中同一符号は同一又は
相当部分を示す。
１……電極、２……被加工物、４……電圧差動
回路、５……増巾器、６……油圧サーボバルブ、
７……油圧シリンダ、８……電極運動制御装置、
９，１０……サーボモータ、１１，１２……Ｘ−
Ｙクロステーブル、１３……差動トランス、１４
……比較選択回路、１６……単安定マルチバイブ
レータ、１５……比較器、１８……ANDゲー
ト。
FIG. 1 is an explanatory diagram of a conventional apparatus, FIGS. 2 and 3 are explanatory diagrams of processing states using an elliptical electrode, and FIG. 4 is an explanatory diagram of the apparatus of the present invention. Note that the same reference numerals in the figures indicate the same or equivalent parts. 1... Electrode, 2... Workpiece, 4... Voltage differential circuit, 5... Amplifier, 6... Hydraulic servo valve,
7... Hydraulic cylinder, 8... Electrode motion control device,
9, 10... Servo motor, 11, 12... X-
Y cross table, 13...Differential transformer, 14
... Comparison selection circuit, 16 ... Monostable multivibrator, 15 ... Comparator, 18 ... AND gate.
Claims (1)
る方向に送られる動きを与える装置と共に、上記
方向に垂直な方向の要素を持つた動きを与える装
置とを備えた放電加工装置において、上記電極が
押し込まれる方向に送られる際、加工間隙の状態
に相当する電圧がほぼ一定になるように電極の送
りを制御する第１の制御装置と、上記電極が所望
する位置にある時には、上記所望する位置を越え
て押し込まれるのを阻止し、所望の位置以上に進
まないようにする第２の制御装置と、上記電極が
上記押し込まれる方向の所定の位置に達した後
で、所定の時間、上記電極の位置が上記所定の位
置から所定値以内にあることを検出する装置とを
備えた放電加工装置。1. In an electric discharge machining apparatus, the electrode is equipped with a device that provides a movement in which the electrode is pushed in a direction relative to the workpiece, and a device that provides a movement that has an element in a direction perpendicular to the above-mentioned direction. a first control device that controls feeding of the electrode so that a voltage corresponding to the state of the machining gap becomes approximately constant when the electrode is fed in the direction in which the electrode is pushed; a second control device for preventing the electrode from being pushed beyond the desired position, and for a predetermined period of time after the electrode reaches the predetermined position in the pushing direction; A device for detecting that the position of the electrode is within a predetermined value from the predetermined position.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6725779A JPS55164433A (en) | 1979-05-30 | 1979-05-30 | Electric discharge machining system |
| DE803047554T DE3047554T1 (en) | 1979-05-30 | 1980-05-27 | ROCKABLE ELECTRICAL DISCHARGE MACHINE APPARATUS |
| CH788/81A CH652632A5 (en) | 1979-05-30 | 1980-05-27 | ELECTRIC EROSION DEVICE. |
| PCT/JP1980/000112 WO1980002665A1 (en) | 1979-05-30 | 1980-05-27 | Rockable electrical discharge machine apparatus |
| US06/422,087 US4467167A (en) | 1979-05-30 | 1982-09-23 | EDM controller for providing a rocking motion to the electrode for finish machining |
| US06/422,086 US4453071A (en) | 1979-05-30 | 1982-09-23 | Electric discharge machine including rocking motion fine machining and controls therefore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6725779A JPS55164433A (en) | 1979-05-30 | 1979-05-30 | Electric discharge machining system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55164433A JPS55164433A (en) | 1980-12-22 |
| JPS6119372B2 true JPS6119372B2 (en) | 1986-05-16 |
Family
ID=13339705
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6725779A Granted JPS55164433A (en) | 1979-05-30 | 1979-05-30 | Electric discharge machining system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS55164433A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02134070U (en) * | 1989-04-17 | 1990-11-07 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59227328A (en) * | 1983-06-09 | 1984-12-20 | Mitsubishi Electric Corp | Electric discharge machine |
| JPS61178115A (en) * | 1985-02-05 | 1986-08-09 | Hitachi Seiko Ltd | Electric discharge machine |
| JPS61219519A (en) * | 1985-03-26 | 1986-09-29 | Mitsubishi Electric Corp | Electric discharge machine |
| JPH07100262B2 (en) * | 1988-10-07 | 1995-11-01 | 三菱電機株式会社 | Discharge machining end determination method and apparatus |
-
1979
- 1979-05-30 JP JP6725779A patent/JPS55164433A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02134070U (en) * | 1989-04-17 | 1990-11-07 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55164433A (en) | 1980-12-22 |
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