JPS60108224A - Wire electric-discharge machining device - Google Patents

Abstract

PURPOSE:To make a device continue its operation without wire disconnection or a short circuit phenomenon, by controlling a rise in machining solution pressure and feed at a time when travel for a return to the disconnection position comes to a specified value after the wire electrode snapped in the midway of machining is repaired at a machining start position. CONSTITUTION:When disconnection of a wire electrode 1 is repaired at a machining start position and reset up to the disconnection position passing through a machining groove 3, a control unit 8 transmits such a command as being turned to low pressure P1 to a machining solution feed unit 9 and feeds a machining solution 7, then at that point that travel of the wire electrode 1 toward the disconnection position before its resetting comes to a specified value, the control unit 8 transmits another command becoming high pressure P2 to the unit 9 in advance so that even if there is some delay in a pressure rise, the electrode 1 is reset to the disconnection position, and at that point of making a machining power source, the machining solution of the pressure P2 is fed out of injection nozzles 5 and 6, thus machining is smoothly continuable.

Description

【発明の詳細な説明】[Detailed description of the invention]

〔発明の技術分野〕 本発明は、ワイヤ放電加工中ｌこワイヤ′疏極が断紗し
た場合に、ワイヤ電極を修腹して加工を続行するにあた
シ、ワイヤ電極の朽断線や短絡現象等を生じることなく
円滑に加工が再開され６ようにしたワイヤ放電加工装置
に関するものであ６．。 〔従来技術〕 一般に−ワイヤ放電加工装置は、導゛−性の被加工物を
、硬度に工らず、複雑な形状でも、容易に精度良く加工
できることは周知である。しかし、属が供せられ、放電
加工中は常に新しいワイヤ電極ビ供給していても、それ
自身が消耗し損傷していくため、ワイヤ電極に加えられ
る、ある一定の張力に抗しきれずに断線し、加工が中断
してしまうことがある。 この様な場合、従来ニジワイヤ自動供給装置があシ、ワ
イヤ電極が断線すると、自動的にＸ−Ｙクロステーブル
Ｙ駆動させ、ワイヤ電極を加工開始位置・＼移動し、加
工開始位置にてワイヤ電極を新しいものに修復させ６゜
次に、既加工軌跡に従い、加工溝にワイヤ電極を通過さ
せながら、ワイヤ電極断線位置・＼復帰し、その後、加
工電源ン投入し、放電エネルギを発生させて加エン続行
するようになっている。第１図は、前記の放電開始位置
よ）。 ワイヤ′ＩＩ！極の断線位置・＼移動する際の例を示し
たものである。同図において、（ηはワイヤ電極、（２
ノーは被加工物、（６）は被加工物に概に形成された加
工溝、（４）は切削屑、（５）は上部加工液噴出ノズル
、（６）は下部加工液噴出ノズルでお６゜ワイヤ電極（
ηは通常ワイヤ電極の直径プラス０．０４朋〜０．０８
關８度０．）非常に狭い間隙の加工溝（３）を通過する
のであるが一加工中に生じる被加工物の内部応力や解放
による歪、あるいはワイヤ放電加工に特有のコーナ一部
における加工溝と所望輪郭形状の不整合等、加工溝がワ
イヤ電極が通過する際に、第２図に示すようにワイヤ電
極へ干渉する変形を生じることがある。 一方、前記ワイヤ電極のワイヤを極所線位置までの移動
中は、常にワイヤ電極乞供給しつづけておシ、このため
、ワイヤ電極が加工溝のエッチにｉｔ＋切断され、切削
屑（４］ヲ生じ、この切削屑（４）がワイヤ電極＜ｉｔ
と被加工物＜２）　’に短絡させ、加工が続行できなく
なることがしばしば起こる。 このような問題・ビ解決する手段としては、第６図に示
すものがある。これは、ワイヤ電極（１）が加工溝（３
）　’２通過する際にも、上下の加工液噴出ノズル（５
）　（６）ニジ加工液（力を供給し、発生した切削屑（
４）を排出し、また、ワイヤ電極（１）と被加工物（２
は一種の絶縁性の緩衝物で遮られるため、ワイヤ電極（
ηと被加工物（２）との接触防止の効果も認められて（
する。 しかし、前記の目的で加工液を供給する場合に供せられ
る圧力Ｐｉ（通常０．５囁虐以下）は、ある最適な範囲
に見いだされ、通常の加工中に供せられる圧力Ｐ２（５
’Ｊ＊以上）、ｃＪ、低いことが知られている。これは
、圧力が高過ぎると、ワイヤ電極の周囲の圧力不均衡が
生じ、ワイヤ電極（１）を大きくたわませる力が生じ、
かえってワイヤ電極（ηと被加工物（２１の接触を促進
し、切削屑＋４７の発生量を多くしてしまう地山による
ものである。 よって、前記ワイヤ電極（１）のワイヤ電極断線位置抜
での移動の間は、圧力Ｐｓ　（０５ｋｙ／ｃ＋＋ｉ以下
）にて加工液ン供給し、・電源が投入されるに際し、加
工に必要な圧力（通常５力以上）・＼上昇させ・加工液
を供給している。しかし、従来（ば、電蝕投入と圧力上
昇の制（財）装置からの指令が同時に送られてお９、加
工液圧が加工に必要な圧力Ｐ２　／＼上昇するまでの時
間おくれにょ力、十分な加工チップ排出能力が得られな
いうちに、加工′電源が投入されての断線、または短絡
現象が起こり、円滑に加工を続行することが困難であっ
た◎ 〔発明の概要〕 本発明は、前記従来の欠点を除去するためになされたも
ので、その目的は、ワイヤ放電加工中のワイヤ電極の断
線時において、加工開始位置にて、ワイヤ′１極を修復
し、既加工軌跡に従って、加工溝にワイヤ電極を通過さ
せ、ワイヤを極所線位置−＼復帰しその後、加工電源を
投入し、加工を続行する際に、ワイヤ断線、あるいは短
絡現象ケ生ぜずに円滑に加工が続行できるワイヤ放電加
工装置を提供することにある。 〔発明の実施例〕 次に、この発明の一実施例〉説明する。第４図において
、第１図〜第６図と同一のものは同一ね号Ｙ付して説明
を省略する。［８Ｊは制（財）装置、（９）は加工液供
給ユニットである。ワイヤ電極の断線を加工開始位置に
て修復し、ワイヤ電極（１）が加工溝−を通過するにあ
たル、制御装置（８）は、加工液供る指令を送り、加工
液（７）を供給し１次に、ワイヤ電極（１）がワイヤ電
極断線位置へ復帰する前ワイヤ軍極所線位１δへの移動
量がある一定値となった時点であらかじめ制１Ｉ１１１
装置（８）は、加工液供給ユニツ）（９１−＼圧力Ｐｇ
（通常５し以上）となる指令を送板圧力上昇の時間おく
れがあってもワイヤ電極（１）がワイヤ電極断線位置・
＼径部し、加工電源[Technical Field of the Invention] The present invention provides a method for repairing the wire electrode in order to repair the wire electrode and continue machining when the wire electrode is broken during wire electrical discharge machining. This invention relates to a wire electrical discharge machining device that allows machining to be resumed smoothly without causing any phenomena.6. . [Prior Art] In general, it is well known that a wire electrical discharge machining apparatus can easily machine a conductive workpiece with high precision, even if it has a complex shape, without machining the workpiece to be hard. However, even if a new wire electrode is constantly supplied during electrical discharge machining, the wire electrode itself will wear out and get damaged, and it will not be able to withstand a certain tension applied to the wire electrode and break. However, machining may be interrupted. In such a case, if the conventional automatic wire feeding device fails, and the wire electrode breaks, the X-Y cross table Y is automatically driven to move the wire electrode to the processing start position, and the wire electrode is removed at the processing start position. 6 degrees.Next, while passing the wire electrode through the machining groove according to the already machining trajectory, the wire electrode returns to the broken position.After that, the machining power is turned on, and discharge energy is generated to perform machining. The engine is now ready to continue. Figure 1 shows the discharge start position mentioned above). Wire'II! This shows an example of when the pole breaks and moves. In the figure, (η is a wire electrode, (2
No is the workpiece, (6) is the machining groove roughly formed on the workpiece, (4) is the cutting waste, (5) is the upper machining fluid jet nozzle, and (6) is the lower machining fluid jet nozzle. 6゜wire electrode (
η is usually the diameter of the wire electrode plus 0.04 to 0.08
8 degrees 0. ) It passes through a machined groove (3) with a very narrow gap, but the internal stress of the workpiece that occurs during machining and distortion due to release, or the machined groove and desired contour shape at a part of the corner unique to wire electric discharge machining. When the wire electrode passes through the machined groove, such as misalignment, deformation may occur that interferes with the wire electrode as shown in FIG. On the other hand, while the wire of the wire electrode is being moved to the extreme line position, the wire electrode is constantly being supplied, and as a result, the wire electrode is cut by the etching of the machining groove, and the cutting waste (4) is removed. This cutting waste (4) is formed on the wire electrode <it
This often causes a short circuit between the workpiece and the workpiece <2), making it impossible to continue machining. As a means for solving such problems, there is a method shown in FIG. This means that the wire electrode (1) is connected to the machined groove (3).
) '2 When passing, the upper and lower machining fluid spout nozzles (5
) (6) Niji machining fluid (supplies force and removes generated cutting waste (
4), and also discharge the wire electrode (1) and the workpiece (2).
is blocked by a kind of insulating buffer, so the wire electrode (
The effect of preventing contact between η and the workpiece (2) was also recognized (
do. However, the pressure Pi (normally 0.5 mm or less) applied when supplying machining fluid for the above purpose is found in a certain optimal range, and the pressure P2 (5
'J* or higher), cJ, is known to be low. This is because if the pressure is too high, there will be a pressure imbalance around the wire electrode, creating a force that causes the wire electrode (1) to deflect significantly,
On the contrary, this is caused by the ground which promotes contact between the wire electrode (η) and the workpiece (21) and increases the amount of cutting waste +47 generated. During the movement, machining fluid is supplied at pressure Ps (05ky/c++i or less), and when the power is turned on, the pressure necessary for machining (usually 5 force or more) is increased.Machining fluid is supplied. However, in the past (for example, commands from the electrolytic erosion input and pressure rise control device were sent at the same time9), the time required for the machining fluid pressure to rise to the pressure P2 /\ required for machining was Due to slow power, disconnection or short-circuit phenomenon occurs when the machining power is turned on before sufficient machining chip ejection capacity is obtained, making it difficult to continue machining smoothly. [Summary of the Invention] ] The present invention has been made to eliminate the above-mentioned conventional drawbacks, and its purpose is to repair the wire '1 pole at the machining start position when the wire electrode is broken during wire electric discharge machining, and to replace the existing wire. Pass the wire electrode through the machining groove according to the machining trajectory, return the wire to the extreme line position, then turn on the machining power and continue machining smoothly without wire breakage or short circuit phenomenon. An object of the present invention is to provide a wire electrical discharge machining device that can continue machining. [Embodiment of the Invention] Next, an embodiment of the present invention will be described. In Fig. 4, the same device as in Figs. 1 to 6 is shown. are given the same number Y and the explanation will be omitted. [8J is the control device, (9) is the machining fluid supply unit. The wire electrode (1 ) passes through the machining groove, the control device (8) sends a command to supply machining fluid, supplies the machining fluid (7), and then moves the wire electrode (1) to the wire electrode breakage position. When the amount of movement to the wire military pole position 1δ reaches a certain value before returning to
The device (8) is a machining fluid supply unit) (91-\pressure Pg
(Normally 5 or more) Even if there is a delay in the rise of the feeding pressure, the wire electrode (1) will be at the wire electrode breakage position.
＼Diameter part and machining power supply

〔発明の効果〕〔Effect of the invention〕

以上の様に、本発明によるワイヤ放電加工装置によれば
、自動的にワイヤ断線を修後し、ワイヤ電極の再断腺や
短絡現象を発生させずに、円滑に加工Ｚ続行できるワイ
ヤ放電加工が実現できる。 また、本実施例↓フ、ワイヤ電極がワイヤ電極断線位置
・＼イシ帰し、加工液供給ユニットから供せられる加工
液玉が圧力Ｐ２に立上るまでの時間余裕の後に、加工電
源Ｚ投入することも、同様の効果をもつことは明らかで
あ６Ｉ。As described above, according to the wire electrical discharge machining apparatus according to the present invention, wire electrical discharge machining can automatically repair a wire breakage and continue machining Z smoothly without causing wire breakage or short circuit phenomenon of the wire electrode. can be realized. In addition, in this embodiment↓, the machining power Z is turned on after the wire electrode returns to the wire electrode disconnection position/return and the machining liquid drop supplied from the machining liquid supply unit rises to the pressure P2. It is clear that 6I also has a similar effect.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は、従来型によるワイヤ電極が被加工物の間隙を
通過する際に接触した状態を示す説明図、第２図は、第
１図の断面図、第６図は、ワイヤ電極と被加工物の間隙
に加工液を供給する場合の説明図、第４図は、本発明の
実施例を示す説明図である。各図中、同一構成要素には
同一符号ｙｒ　ｆ＝Ｊシ、（１）はワイヤ′電極、（２
）は被加工物−（６）は加工溝、（４１は切削屑、＋５
１は上部加工液噴出ノズル−［６＋　ｉ；！下部加工液
噴出ノズル−（７１は加工液、（８）は制御装置、（９
）は加工液供給ユニットである。 なお・各図中同一符号は同一または相当部分を示すもの
とする。 代理人弁理士　木　利　三　朗 第１図 ／ 第２図 第３図FIG. 1 is an explanatory diagram showing a conventional wire electrode in contact with the workpiece when passing through a gap, FIG. 2 is a sectional view of FIG. 1, and FIG. 6 is a diagram showing the wire electrode and the workpiece. FIG. 4 is an explanatory diagram showing a case where machining liquid is supplied to a gap in a workpiece, and FIG. 4 is an explanatory diagram showing an embodiment of the present invention. In each figure, the same components have the same symbols yr f = J, (1) is the wire 'electrode, (2
) is the workpiece - (6) is the machined groove, (41 is the cutting waste, +5
1 is the upper machining liquid jet nozzle - [6+ i;! Lower machining fluid ejection nozzle - (71 is machining fluid, (8) is a control device, (9
) is a machining fluid supply unit. Note that the same reference numerals in each figure indicate the same or equivalent parts. Representative Patent Attorney Sanro Ki Toshihiro Figure 1/ Figure 2 Figure 3

Claims (1)

【特許請求の範囲】[Claims] （１）導電性の被加工物に対しワイヤ電極を微小間隙を
介して対向させ、該微小間隙に供給される加工液の媒介
の下に発生する放電エネルギにより被加工物ヶ切断加工
すると共に、一方上記ワイヤ電極の断心時には自動的に
ワイヤ電極なＸ−Ｙクロステーブルを介して加工開始位
置へ移動させ、該加工開始位置にてワイヤ電極の修彷を
行ったのち縦加工軌跡に従って加工溝にワイヤ電極を通
過させながら上記のワイヤ電極断線位置へ復帰し、その
後放電エネルギを発生させて加工を続行するように（、
たワイヤ放電加工装置において、加工開始位置ニジワイ
ヤ電極〃ｉ線位置・＼移動する際に、該断ｉ面位置−＼
到達する前ｌこ、当該加工に必要な加工液圧又は加工液
流量ケワイヤ電極と被加工物間に供給す心＝うにしたこ
とを特徴とするワイヤ放電加（２）加工液圧又は加工液
流量の供給はワイヤ電極断線位置までの移動量が、ある
一定値となってから行うようにしたことを特徴とする特
許請求の範囲第１項記載のワイヤ放電加工装置。 Ｔ３Ｊ加工液圧又は加工液流量の供給はワイヤ放電ルミ
線位置までの移動時間がある一定値と１．ｃつてから行
うようにしたことン特徴とする特Ｈ’＋請求の範囲第１
項記載のワイヤ放電加工装置。(1) A wire electrode is opposed to a conductive workpiece through a minute gap, and the workpiece is cut by electric discharge energy generated under the medium of machining fluid supplied to the minute gap, and On the other hand, when the wire electrode is broken, the wire electrode is automatically moved to the machining start position via the X-Y cross table, and after the wire electrode is retraced at the machining start position, the machining groove is machined according to the vertical machining trajectory. The wire electrode returns to the above-mentioned broken position while passing through the wire electrode, and then discharge energy is generated to continue machining (,
In wire electric discharge machining equipment, when moving the machining start position of the rainbow wire electrode to the i-line position, the cross-sectional i-plane position -\
(2) Machining fluid pressure or flow rate of machining fluid required for the machining process. 2. The wire electrical discharge machining apparatus according to claim 1, wherein the supply of the wire is performed after the amount of movement of the wire electrode to the disconnection position reaches a certain constant value. The supply of T3J machining fluid pressure or machining fluid flow rate is set to a certain value for the travel time to the wire discharge luminescent line position.1. Feature H' + Claim 1
The wire electrical discharge machining apparatus described in .