JPH03234417A - Wire electric discharge machining method - Google Patents
Wire electric discharge machining methodInfo
- Publication number
- JPH03234417A JPH03234417A JP2716690A JP2716690A JPH03234417A JP H03234417 A JPH03234417 A JP H03234417A JP 2716690 A JP2716690 A JP 2716690A JP 2716690 A JP2716690 A JP 2716690A JP H03234417 A JPH03234417 A JP H03234417A
- Authority
- JP
- Japan
- Prior art keywords
- machining
- wire electrode
- wire
- electric discharge
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000003754 machining Methods 0.000 title claims description 60
- 238000009763 wire-cut EDM Methods 0.000 claims description 6
- 238000009760 electrical discharge machining Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、ワイヤ放電加工方法に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a wire electrical discharge machining method.
［従来の技術］
第２図は従来のワイヤ放電加工装置の概略構成図であり
、図において、１は高周波パルス電流を供給１７、被加
工物２を微小な間隙でもって加工するワイヤ電極、３は
被加工物２を固定するＸ−Ｙクロステーブル、４，５は
Ｘ−Ｙクロステーブル３を１ａ交軸（Ｘ、Ｙ軸）方向に
駆動する駆動用モータ、６は駆動用モータ４，５に所要
の回転数を指令する制御装置、７はワイヤ電極１に電気
的エネルギーを供給する加工用電源である。[Prior Art] FIG. 2 is a schematic configuration diagram of a conventional wire electric discharge machining apparatus. In the figure, 1 is a wire electrode 17 for supplying a high-frequency pulse current, a wire electrode 3 for machining a workpiece 2 with a small gap, and 3 4 and 5 are drive motors that drive the X-Y cross table 3 in the direction of the transverse axes 1a (X, Y axes), and 6 are drive motors 4 and 5 that fix the workpiece 2. 7 is a processing power source that supplies electrical energy to the wire electrode 1.
次に動作について説明する。まず、制御装置６からの指
令により、加工用電源７より荒加工（ファーストカット
）用の電気的エネルギーをワイヤ電極１に供給し、次い
で制御装置６によって駆動用モータ４，５を駆動させ、
Ｘ−Ｙクロステーブル３にあらかじめプログラムされた
所要の動作をさせる。Next, the operation will be explained. First, according to a command from the control device 6, electrical energy for rough machining (first cut) is supplied from the processing power source 7 to the wire electrode 1, and then the drive motors 4 and 5 are driven by the control device 6.
The X-Y cross table 3 is caused to perform a pre-programmed required operation.
荒加工終了後、制御装置６からの指令により、加工用電
源７よりワイヤ電極１に供給する電気的エネルギーを小
さくし、かつワイヤ電極１にかける張力を大きくし、再
び加工用電源７よりワイヤ電極１に、荒加工時の電気的
エネルギーより微小な電気的エネルギーを供給し、制御
装置６の指令により駆動用モータ４，５を駆動させ、ｘ
−ｙクロステーブル３をあらかじめ入力されたプログラ
ム通りに動作させる。After the rough machining is completed, the electric energy supplied to the wire electrode 1 from the machining power supply 7 is reduced, the tension applied to the wire electrode 1 is increased, and the machining power supply 7 again supplies the wire electrode 1 with a command from the control device 6. 1, electric energy smaller than that during rough machining is supplied to drive motors 4 and 5 according to commands from the control device 6,
-y Operate the cross table 3 according to the program input in advance.
複数回にわたる加工については、同様の動作において、
加工用電源７からワイヤ電極１に供給する電気条件を順
次小さくしていき、複数回の加工を実施し、良好な加工
精度及び面あらさを得ている。For multiple machining, in the same operation,
The electrical conditions supplied from the machining power source 7 to the wire electrode 1 were gradually reduced, and machining was performed multiple times to obtain good machining accuracy and surface roughness.
ところで、ワイヤ電極１は放電加工中において弓状に変
形することが知られている。第３図は例えば特開昭６３
−２２２２１号公報に示されたワイヤ電極の変形状態を
示す説明図である。図中、８はワイヤ電極１の上下のワ
イヤガイドである。By the way, it is known that the wire electrode 1 deforms into a bow shape during electrical discharge machining. Figure 3 shows, for example, JP-A-63
It is an explanatory view showing a deformed state of the wire electrode shown in the -22221 publication. In the figure, 8 is a wire guide above and below the wire electrode 1.
ワイヤ電極１は張力Ｐでもって上から下へ移動しており
、ワイヤガイド８の間隔はＬで、この中間に板厚Ｈの被
加工物２を対向させたとする。加工送りの相対移動はワ
イヤ電極１を基準とした場合を矢印方向で示す。被加工
物２のハツチング部分は既にワイヤ電極１により加工さ
れた部分を示し、点Ａはガイド点、Ｂは被加工物２とワ
イヤ電極１が交差する点、Ｃは上下ワイヤガイド８の中
心点である。It is assumed that the wire electrode 1 is moving from top to bottom with a tension P, the distance between the wire guides 8 is L, and a workpiece 2 having a plate thickness H is placed opposite to each other in the middle. The relative movement of machining feed is shown in the direction of the arrow with respect to the wire electrode 1. The hatched part of the workpiece 2 indicates the part that has already been processed by the wire electrode 1, point A is the guide point, B is the point where the workpiece 2 and the wire electrode 1 intersect, and C is the center point of the upper and lower wire guides 8. It is.
ワイヤ電極１には放電の反発力等に起因する圧力Ｆが作
用し、この圧力Ｆのためにワイヤ電極１は第３図のよう
にＡ−Ｂ−Ｃ−Ｂ−Ａの円弧を描いて湾曲する。そのた
わみ量δはδ−ＨＦ／４Ｐで表わされる。Pressure F due to the repulsive force of discharge acts on the wire electrode 1, and due to this pressure F, the wire electrode 1 curves in an arc of A-B-C-B-A as shown in Fig. 3. do. The amount of deflection δ is expressed as δ-HF/4P.
［発明が解決しようとする課題］
従来のワイヤ放電加工方法では複数回にわたる加工の場
合、加工送りを継続させた状態で電気条件を加工段階ご
とに切り替えながら加工を行っていた。しかしながら、
電気条件の切替えの際には加工液の交換及びワイヤ電極
の張力の変更を必要とし、これに伴いワイヤ電極に固有
の振動モードが変わる。そのうえにワイヤ電極は弓状に
たわみ変形しており、このような状態で電気条件を切り
替えると、被加工物とワイヤ電極との間隙（以下、加工
間隙と記述する。）が変化しているために被加工物とワ
イヤ電極が接触したり（短絡現象）、ワイヤ電極が断線
したりして加工が停止するという課題があった。[Problems to be Solved by the Invention] In the conventional wire electric discharge machining method, when machining is performed multiple times, machining is performed while machining feed is continued and electrical conditions are switched for each machining stage. however,
When changing the electrical conditions, it is necessary to replace the machining fluid and change the tension of the wire electrode, which changes the vibration mode specific to the wire electrode. Moreover, the wire electrode is bent and deformed into an arched shape, and if the electrical conditions are changed in this state, the gap between the workpiece and the wire electrode (hereinafter referred to as the machining gap) changes. There was a problem that the workpiece and the wire electrode came into contact with each other (short circuit phenomenon) or the wire electrode broke, causing the processing to stop.
本発明は、上記のような課題を解決するためになされた
もので、複数回にわたる加工において電気条件を切り替
えた際にワイヤ電極の短絡や断線を引き起こすことなく
円滑な加工ができるワイヤ放電加工方法を得ることを目
的とする。The present invention has been made to solve the above-mentioned problems, and provides a wire electrical discharge machining method that allows smooth machining without causing short circuits or disconnections of the wire electrode when changing electrical conditions during multiple machining operations. The purpose is to obtain.
［課題を解決するための手段］
本発明に係るワイヤ放電加工方法は、ワイヤ電極に付与
する電気条件を加工段階ごとに切り替えながら複数回に
わたる放電加工を行う場合において、電気条件を切り替
える前に、加工送りを一時停止させ所要時間放電させる
工程を設けたものである。[Means for Solving the Problems] In the wire electrical discharge machining method according to the present invention, when electrical discharge machining is performed multiple times while switching the electrical conditions applied to the wire electrode at each processing stage, before switching the electrical conditions, A process is provided in which machining feed is temporarily stopped and discharge is performed for a required period of time.
［作 用コ
本発明においては、複数回にわたる放電加工で加工段階
ごとにワイヤ電極に付与する電気条件を切り替える際、
加工送りを一時停止させ所要時間放電させる工程を設け
ているため、この放電によって加工間隙が広がることに
なる。したがって、電気条件の切替えによりワイヤ電極
の固有振動モードが変わっても、加工間隙の拡大により
ワイヤ電極の短絡を防止でき、またワイヤ電極のたわみ
が解消されるためワイヤ電極の短絡や断線を防止できる
。[Function] In the present invention, when changing the electrical conditions applied to the wire electrode at each machining stage during multiple electrical discharge machining,
Since a step is provided in which machining feed is temporarily stopped and discharge is performed for a required period of time, the machining gap widens due to this discharge. Therefore, even if the natural vibration mode of the wire electrode changes due to a change in electrical conditions, shorting of the wire electrode can be prevented by expanding the machining gap, and shorting or disconnection of the wire electrode can be prevented because the deflection of the wire electrode is eliminated. .
放電時間は被加工物の材質、板厚、使用ワイヤ電極の材
質、直径によって決定されるが、また加工段階ごとに放
電時間を変更することによって加工時間の短縮をはかる
こともできる。The discharge time is determined by the material and plate thickness of the workpiece, and the material and diameter of the wire electrode used, but the machining time can also be shortened by changing the discharge time for each machining stage.
［実施例］ 以下、本発明の一実施例を図により説明する。[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第１図は本発明によるワイヤ放電加工方法に適用するフ
ローチャートであり、加工装置自体は従来例と同じであ
るので、第２図に示した符号を用いる。FIG. 1 is a flowchart applied to the wire electric discharge machining method according to the present invention, and since the machining apparatus itself is the same as the conventional example, the symbols shown in FIG. 2 are used.
まず、ステップ１１において、加工開始前に、被加工物
の材質、板厚、使用ワイヤ電極の材質、及び直径を入力
する。First, in step 11, before starting machining, the material and plate thickness of the workpiece, the material and diameter of the wire electrode to be used are input.
次に、ステップ１２において加工回数Ｎを人力すると、
あらかじめ制御装置６内に入力されているステップ１１
の各事項によって各々の加工終了時の放電時間を自動的
に設定する。このとき、ファーストカットのみで加工を
終了させる場合については加工終了時の放電時間は設定
しない。したがって、セカンドカット以降の複数回の加
工の場合にのみ放電時間の設定を行い、ステップ１３に
おける加工回数の判断がＹＥＳであれば、次のステップ
１４にてその設定された放電時間で良いか否かを確認す
る。良ければ加工を開始しくステップ１５）、否であれ
ば設定時間のパラメータの変更を行い（ステップ１６）
、加工を開始する。Next, in step 12, if the number of machining times N is manually increased,
Step 11 inputted into the control device 6 in advance
The discharge time at the end of each machining is automatically set according to each item. At this time, if machining is to be completed with only the first cut, the discharge time at the end of machining is not set. Therefore, the discharge time is set only in the case of machining multiple times after the second cut, and if the determination of the number of machinings in step 13 is YES, the next step 14 is to determine whether or not the set discharge time is sufficient. Check whether If it is OK, start machining (Step 15), if not, change the setting time parameter (Step 16).
, start processing.
こうして１回の加工終了後、つまりファーストカット終
了後、次のセカンドカットで電気条件を切り替える前に
、上記の設定された時間だけ加工送りを停止させ、放電
をその加工位置で実施しくステップ１７）、その後、電
気条件を切り替え、かつ電気エネルギーを小さくしてい
き（ステップ１８）、加工を継続させる（ステップ１つ
）。この加工送りの停止状態て所定時間放電させること
により、加工間隙が広がり、ワイヤ電極１のたわみが解
消されるとともに、ワイヤ電極１の固有振動モードの変
化に対しても加工間隙の拡大によって対処できる。In this way, after one machining is completed, that is, after the first cut, and before switching the electrical conditions for the next second cut, the machining feed is stopped for the above-set time, and electric discharge is performed at that machining position (Step 17) After that, the electrical conditions are changed and the electrical energy is reduced (step 18), and the processing is continued (one step). By discharging for a predetermined time while the machining feed is stopped, the machining gap widens, the deflection of the wire electrode 1 is eliminated, and changes in the natural vibration mode of the wire electrode 1 can also be dealt with by expanding the machining gap. .
次に、ステップ２０において加工回数のパラメータＮを
Ｎ−Ｎ−１としたとき、ステップ２１の判断でＮ≦１で
あれば、ファーストカット時と同様に加工を終了させ、
Ｎ≦１でなければ、再度ステップ１５に戻って次回の電
気条件切替えの前に設定された当該加工位置での放電時
間経過後に電気条件を切り替えて加工を継続し、Ｎ≦１
となるまで同様の動作を繰り返すものである。また、加
工時間の短縮のために加工段階ごとの放電時間は順次短
くしていくことが好ましい。Next, when the parameter N of the number of machining is set to N-N-1 in step 20, if N≦1 in the judgment in step 21, the machining is finished in the same way as the first cut,
If N≦1, return to step 15 again, switch the electrical conditions and continue machining after the discharge time at the machining position set before the next electrical condition switch has elapsed, and N≦1.
The same operation is repeated until . Further, in order to shorten the machining time, it is preferable to sequentially shorten the discharge time for each machining stage.
なお、以上の動作フローの実行は制御装置６により行わ
れる。Note that the above operation flow is executed by the control device 6.
また、上記実施例では被加工物の材質、板厚、使用ワイ
ヤ電極の材質、直径によって自動的に放電時間を設定し
ているが、加工を実施するうえでのプログラム中に同様
の動作を行うための停止コードを入力しておいても同様
の作用効果が得られる。In addition, in the above embodiment, the discharge time is automatically set depending on the material and thickness of the workpiece, the material and diameter of the wire electrode used, but similar operations are performed during the program when performing machining. The same effect can be obtained by inputting a stop code for .
［発明の効果］
以上のように本発明によれば、１回目の加工から２回目
以降の加工に移行する際の電気条件の切替え時に加工送
りを停止させ所要時間放電させる工程を設けたので、こ
の放電によって加工間隙が広げられる結果、ワイヤ電極
の短絡や断線がなくなり、円滑な加工が実現できるとい
う効果が得られる。[Effects of the Invention] As described above, according to the present invention, the process of stopping the machining feed and discharging for the required time when switching the electrical conditions when transitioning from the first machining to the second and subsequent machining is provided. As a result of the machining gap being widened by this electric discharge, short circuits and disconnections of the wire electrodes are eliminated, and smooth machining can be achieved.
第１図は本発明によるワイヤ放電加工方法を説明するた
めのフローチャート、第２図は従来のワイヤ放電加工装
置の概略構成図、第３図は放電加工中におけるワイヤ電
極の変形状態を示す説明図である。
１・・・ワイヤ電極
２・・・被加工物
３・・・Ｘ−Ｙクロステーブル
４５・・・駆動用モータ
６・・・制御装置
７・・・加工用電源
なお、各図中、同一符号は同一または相当部分を示す。Fig. 1 is a flowchart for explaining the wire electrical discharge machining method according to the present invention, Fig. 2 is a schematic configuration diagram of a conventional wire electrical discharge machining device, and Fig. 3 is an explanatory diagram showing the deformation state of the wire electrode during electrical discharge machining. It is. 1...Wire electrode 2...Workpiece 3...X-Y cross table 45...Drive motor 6...Control device 7...Machining power source Note that the same reference numerals are used in each figure. indicate the same or equivalent part.
Claims (1)
えながら複数回にわたる放電加工を行う場合において、
電気条件を切り替える前に、加工送りを一時停止させ所
要時間放電させる工程を設けたワイヤ放電加工方法。When electrical discharge machining is performed multiple times while changing the electrical conditions applied to the wire electrode at each machining stage,
A wire electrical discharge machining method that includes a step of temporarily stopping machining feed and allowing electrical discharge for a required period of time before switching electrical conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2716690A JPH03234417A (en) | 1990-02-08 | 1990-02-08 | Wire electric discharge machining method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2716690A JPH03234417A (en) | 1990-02-08 | 1990-02-08 | Wire electric discharge machining method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03234417A true JPH03234417A (en) | 1991-10-18 |
Family
ID=12213474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2716690A Pending JPH03234417A (en) | 1990-02-08 | 1990-02-08 | Wire electric discharge machining method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03234417A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8013311B2 (en) | 2003-07-14 | 2011-09-06 | Fei Company | Dual beam system |
| US8183547B2 (en) | 2009-05-28 | 2012-05-22 | Fei Company | Dual beam system |
-
1990
- 1990-02-08 JP JP2716690A patent/JPH03234417A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8013311B2 (en) | 2003-07-14 | 2011-09-06 | Fei Company | Dual beam system |
| US8399864B2 (en) | 2003-07-14 | 2013-03-19 | Fei Company | Dual beam system |
| US8183547B2 (en) | 2009-05-28 | 2012-05-22 | Fei Company | Dual beam system |
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