JPS61274820A - Wire cut electric discharge machining method - Google Patents

Abstract

PURPOSE:To enable the method to also improve productivity, by applying a conductive coating to a work surface so as to prevent deterioration of a quality on the work surface due to its pitting, in the case of the electric discharge machining method by a wire cut electric discharge machine. CONSTITUTION:The surface of a work is coated with a conductive coating 10 by applying conductive paint of zinc rich paint or the like, or metal foil 11 of copper and brass or the like is adhesively attached to the work surface by using a conductive adhesive agent 12 of E solder or the like, and if the work is machined as normally with the work surface serving as the anode while a wire serving as the cathode, the method, allowing an electrolytic current to flow between the conductive coating 10 or the foil 11 and an electrode 2, prevents the work from being electrolytically melted while its pitting from being generated. The method, after it completes machining, removes the coating by dissolution using a solvent and chemicals and by mechanical exfoliation or the like. In this way, the electric discharge machining method, preventing deterioration of a quality due to the pitting while eliminating the necessity also for secondary machining removing the pitting, improves also the productivity.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、ワイヤカット放電加工装置による被加工物
の加工方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of machining a workpiece using a wire-cut electric discharge machining device.

〔従来の技術〕[Conventional technology]

第４図はワイヤカット放電加工装置を用いて、従来の加
工方法により被加工物を加工する場合の説明図である。FIG. 4 is an explanatory diagram when a workpiece is machined by a conventional machining method using a wire-cut electrical discharge machining device.

図において、（１）は直流電源回路（３）の陽極側に接
続された被加工物であシ、（２）は摺動子（４）によっ
て直流電源回路（３）の陰極側に接続されたワイヤ電極
である。（５）は放電加工機の放電回路、（６）は加工
ｇ、を噴出するノズルで、加工液としては通常の場合水
が用いられる。In the figure, (1) is the workpiece connected to the anode side of the DC power supply circuit (3), and (2) is the workpiece connected to the cathode side of the DC power supply circuit (3) by the slider (4). This is a wire electrode. (5) is a discharge circuit of an electrical discharge machine, (6) is a nozzle that spouts machining g, and water is normally used as the machining fluid.

第５図は上記の放電加工方法によって加工した被加工物
の平面図で、（１）は被加工物、（７）は被加工物の加
工開始位置にあけられた加工開始孔、（８）は所要の形
状に加工された加工溝、（９）ハ加工ｉｆ！（８）の周
辺に発生し友多数の孔食である。Fig. 5 is a plan view of a workpiece machined by the above electric discharge machining method, in which (1) is the workpiece, (7) is the machining start hole drilled at the machining start position of the workpiece, and (8) is the workpiece. (9) C machining if! (8) This is a large amount of pitting corrosion that occurs around the area.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従来のワイヤカット加工方法においては、第４図及び第
５図に示し念ように、通常、水を加工液とし、被加工物
（１）を陽極とし、ワイヤ電極（２）を陰極として加工
するので、被加工物（１）とワイヤ電極（２）との間に
電解作用が働き、被加工物（１）が溶出する。特に被加
工物（１ンの上面および下面は、ワイヤ電極（２）の上
部および下部の長いワイヤと対向するので、砿加工物（
１）の加工溝（８）の周辺が顕著に溶出する。さらに、
被加工物（１）は通常不働態皮膜によって覆われており
、皮膜の弱い部分が破壊されて電流が流れ、孔食（９）
を発生することが多い。In the conventional wire cutting method, as shown in FIGS. 4 and 5, water is usually used as the processing fluid, the workpiece (1) is used as the anode, and the wire electrode (2) is used as the cathode. Therefore, an electrolytic action acts between the workpiece (1) and the wire electrode (2), and the workpiece (1) is eluted. In particular, since the upper and lower surfaces of the workpiece (1) face the long wires at the upper and lower parts of the wire electrode (2),
The area around the processed groove (8) of 1) is noticeably eluted. moreover,
The workpiece (1) is usually covered with a passive film, and weak parts of the film are destroyed and current flows, causing pitting corrosion (9).
often occurs.

このように従来のワイヤカット加工方法では、被加工物
（１〕の人面に多数の孔食（９）を発生することが多く
、このため被加工物の品質の低下、孔食除去の友めの工
数の増加等、種々問題があった。As described above, in the conventional wire cutting method, a large amount of pitting corrosion (9) often occurs on the face of the workpiece (1), which reduces the quality of the workpiece and makes it difficult to remove pitting corrosion. There were various problems such as an increase in the number of man-hours required.

この発明は、上記のような従来の問題点を解決するため
なされたもので、被加工物に孔食が発生することを防き
、被加工物の品質を高め、孔食除去加工を不要とするワ
イヤカット放電加工方法を提供することを目的とするも
のである。This invention was made in order to solve the conventional problems as described above, and it prevents pitting corrosion from occurring on the workpiece, improves the quality of the workpiece, and eliminates the need for pitting corrosion removal processing. The object of the present invention is to provide a wire cut electrical discharge machining method.

〔問題点を解決するための手段〕[Means for solving problems]

この発明は、被加工物の人面に導電性被覆を施こして加
工することにより、被加工物に孔食が発生することを防
止したワイヤカット加工方法を提供するものである。The present invention provides a wire cutting method that prevents pitting corrosion from occurring in a workpiece by applying a conductive coating to the human face of the workpiece.

〔作用〕[Effect]

この発明は、被加工物に施こし念導電性様覆とワイヤ電
極との間に電解電流が流れるようにしたため被加工物が
防食され、孔食が発生しない。In this invention, since an electrolytic current is caused to flow between the wire electrode and the electrically conductive coating applied to the workpiece, the workpiece is protected from corrosion and pitting corrosion does not occur.

〔発明の実施例〕[Embodiments of the invention]

第１図は、この発明のワイヤカット加工方法により加工
し九のち被覆を除去した被加工物の平面図であり、（１
）は被加工物、（））は加工開始孔、（８）は加工溝で
、被加工物（１）には孔食が発生していない。FIG. 1 is a plan view of a workpiece processed by the wire cut processing method of the present invention and after which the coating is removed.
) is the workpiece, ( ) is the machining start hole, (8) is the machining groove, and no pitting corrosion has occurred in the workpiece (1).

第２図は被加工物（１）に導電性被覆−を施こした状態
を示す断面図で、被加工物（１）の六回に導電性被覆（
ト）としては、ジンクリッチペイント　（ローバル（登
録商標）など）または導電性塗料（ドータイト（登録商
標）など）などを塗布したものである。Figure 2 is a cross-sectional view showing a state in which a conductive coating is applied to the workpiece (1).
Examples of the coating include zinc-rich paint (such as Roval (registered trademark)) or conductive paint (such as Dotite (registered trademark)).

第６図は被加工物（１）に金属箔（ロ）を導電性接着４
ｒ（６）で接着した状態を示す断面図で、金属箔α力と
しては、銅、黄銅、アルミニウム、鉄など各種材質のも
のを用いることができ、ま九導電性接着剤（６）は、各
種の導電性接着剤（Ｅソルダ（登録商標）。Figure 6 shows conductive adhesive bonding of metal foil (b) to workpiece (1).
This is a cross-sectional view showing the state of bonding with r (6). As the metal foil α force, various materials such as copper, brass, aluminum, and iron can be used, and the conductive adhesive (6) is Various conductive adhesives (E Solder (registered trademark).

ドータイト（登録商標）など）を使用することができる
。なお、必要に応じて側面も金属箔（１１で被覆しても
よい。また、導電性接着剤（６）は、感圧接着剤を予め
金属箔へ１）ＶＣ塗布したものを用いることもできる。Dotite (registered trademark), etc.) can be used. Incidentally, the side surfaces may also be covered with metal foil (11) if necessary.Also, as the conductive adhesive (6), it is also possible to use a pressure-sensitive adhesive coated with 1) VC on the metal foil in advance. .

上記のように構成し之この発明の詳細な説明すれば次の
通りである。第２図まｔは第３図に示す導電性被覆（至
）又はＱｌ）を権こした被加工物（１）を陽極とし、ワ
イヤ電極（２）を陰極としてワイヤカット放電加工装置
により加工した場合、電解電流は導電性被覆αｑ又はα
力とワイヤ電極（２）との間に流れるので、！ｆ１加工
物（１）が電解溶出する。ことがなく、被加工物（すに
孔食な発生することがない。なお、ワイヤカット加工後
、導電性接着剤又はα■］覆の特性に応じて１機械的剥
離、溶剤による溶解又は薬品による化学的溶解など、適
当な方法により除去する。A detailed explanation of the present invention constructed as described above will be as follows. Figure 2 and t are machined using a wire-cut electrical discharge machining device, with the workpiece (1) covered with the conductive coating shown in Figure 3 (1) as the anode and the wire electrode (2) as the cathode. , the electrolytic current flows through the conductive coating αq or α
Because it flows between the force and the wire electrode (2)! The f1 workpiece (1) is electrolytically eluted. There is no pitting corrosion on the workpiece (no pitting corrosion occurs on the workpiece).After wire cutting, mechanical peeling, solvent dissolution, or chemical removal is required depending on the characteristics of the conductive adhesive or coating. removal by a suitable method, such as chemical dissolution with

上記の説明では、被加工物に発生する孔食な防止するワ
イヤカット加工方法の場合について示したが、この発明
はこれに限定するものではなく、その他の電解作用に伴
う孔食が問題となる場合にも適用することができる。In the above explanation, the wire cutting method is used to prevent pitting corrosion from occurring in the workpiece, but the present invention is not limited to this, and pitting corrosion due to other electrolytic effects may be a problem. It can also be applied in cases.

〔発明の効果〕〔Effect of the invention〕

以上の説明から明らかなように、この発明によれば被加
工物に導電性被覆を施こしてワイヤカット放電加工を実
施することにより、ｉ加工物式面に孔食を発生すること
なく所定の加工を行うことができる。このため孔食によ
る被加工物の品質劣化を防止できるばかりでなく、孔食
除去の２次加工を行う必要がないので生産性を向上する
ことができる等、実施による効果大である。As is clear from the above description, according to the present invention, by applying a conductive coating to a workpiece and performing wire cut electrical discharge machining, a predetermined amount of damage can be achieved without causing pitting corrosion on the surface of the workpiece. Can be processed. For this reason, it is possible to not only prevent quality deterioration of the workpiece due to pitting corrosion, but also improve productivity because there is no need to perform secondary processing to remove pitting corrosion.

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

第１図はこの発明の実施例における被加工物の平面図、
第２図、第３図はこの発明の実施例における導電性被覆
を施こした被加工物の断面図、第４図はワイヤカット放
電加工方法の一例を示す説明図、第５図は従来のワイヤ
カット加工方法により加工した被加工物の平面図である
。 図において、（１）は被加工物、（２）Ｆｉワイヤ電極
、（８）は加工溝、（９）は孔食、αｑは導電性塗料、
Ｃ１っは金属箔、（６）は導電性接着剤である。 なお、図中同一符号は同−又は相当部分を示すものとす
る。 代理人　弁理士　佐　藤　正　年 第１図 １０娼電岐唆糾 １１：＠恩遁 第２図　　　１２：導電・Ｗ叱為刺 第３図FIG. 1 is a plan view of a workpiece in an embodiment of the present invention;
2 and 3 are cross-sectional views of a workpiece coated with a conductive coating according to an embodiment of the present invention, FIG. 4 is an explanatory diagram showing an example of a wire-cut electrical discharge machining method, and FIG. 5 is a conventional FIG. 2 is a plan view of a workpiece processed by a wire cut processing method. In the figure, (1) is the workpiece, (2) the Fi wire electrode, (8) is the processed groove, (9) is the pitting corrosion, αq is the conductive paint,
C1 is a metal foil, and (6) is a conductive adhesive. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent: Masaru Sato, Patent Attorney Figure 1 10 Prostitution and Instigation 11: @Onton Figure 2 12: Conductive/W Reprimand Figure 3

Claims (3)

【特許請求の範囲】[Claims] （１）ワイヤカット放電加工装置により被加工物を加工
する加工方法において、前記被加工物の表面に導電性被
覆を施したのち加工することを特徴とするワイヤカット
放電加工方法。(1) A wire-cut electric discharge machining method in which a workpiece is machined by a wire-cut electric discharge machining device, characterized in that the workpiece is machined after applying a conductive coating to the surface of the workpiece. （２）前記導電性被覆として、被加工物の表面に導電性
塗料を塗布することを特徴とする特許請求の範囲第１項
記載のワイヤカット放電加工方法。(2) The wire-cut electrical discharge machining method according to claim 1, characterized in that the conductive coating includes applying a conductive paint to the surface of the workpiece. （３）前記導電性被覆として、被加工物の表面に金属箔
を導電性接着剤で接着することを特徴とする特許請求の
範囲第１項記載のワイヤカット放電加工方法。(3) The wire-cut electrical discharge machining method according to claim 1, characterized in that the conductive coating is a metal foil adhered to the surface of the workpiece using a conductive adhesive.