JPH09323222A - Manufacture of electrode wire for elector-discharge machining - Google Patents
Manufacture of electrode wire for elector-discharge machiningInfo
- Publication number
- JPH09323222A JPH09323222A JP14155696A JP14155696A JPH09323222A JP H09323222 A JPH09323222 A JP H09323222A JP 14155696 A JP14155696 A JP 14155696A JP 14155696 A JP14155696 A JP 14155696A JP H09323222 A JPH09323222 A JP H09323222A
- Authority
- JP
- Japan
- Prior art keywords
- copper
- discharge machining
- wire
- electrode wire
- copper alloy
- 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.)
- Withdrawn
Links
Landscapes
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は放電加工用電極線、
特にワイヤカット放電加工に適した放電特性と機械的強
度とを備えた電極線を製造する方法に関する。TECHNICAL FIELD The present invention relates to an electrode wire for electric discharge machining,
In particular, the present invention relates to a method for producing an electrode wire having electric discharge characteristics and mechanical strength suitable for wire cut electric discharge machining.
【0002】[0002]
【従来の技術】金属材料に精密な加工を施す方法として
放電加工法がある。かかる放電加工の中で、プレス金型
などを製造するためのワイヤカット加工のために、放電
加工用電極線が使用されている。このような放電加工に
おいては、切断加工した表面の精度を良好に維持するこ
とが必要であり、放電加工用電極線が使用中に緩みが生
ずると加工精度も低下することから、放電加工に際して
は電極線を常に緊張した状態で使用しなければならな
い。2. Description of the Related Art There is an electric discharge machining method as a method for performing precision machining on a metal material. Among such electric discharge machining, an electric discharge machining electrode wire is used for wire cutting for manufacturing a press die or the like. In such electric discharge machining, it is necessary to maintain good precision of the cut surface, and if the electrode wire for electric discharge machining becomes loose during use, the machining accuracy also decreases. The electrode wires must always be used in tension.
【0003】こうした放電加工用電極線として、従来か
ら黄銅製の細線などが使用されているが、使用中に引張
強度が低下する傾向があって加工精度を高めるのに限度
があり、また使用寿命が短いという問題があった。これ
に対して、加工速度と加工精度とを共に改良できる放電
加工用電極線として、芯材がCu中に0.1〜1.0%
のAlを内部酸化粒子として分散させた焼結合金で、皮
材がCuからなる複合線の表面に、Zn又はAlをメッ
キしたものが提案されている(特開昭57−20113
3号)。Conventionally, thin wires made of brass have been used as such electrode wires for electric discharge machining. However, there is a tendency that the tensile strength tends to decrease during use, and there is a limit to improving machining accuracy, and the service life is limited. Was short. On the other hand, as an electric discharge machining electrode wire capable of improving both machining speed and machining accuracy, the core material is 0.1 to 1.0% in Cu.
A sintered alloy in which Al is dispersed as internal oxide particles, in which Zn or Al is plated on the surface of a composite wire whose skin material is Cu has been proposed (JP-A-57-20113).
No. 3).
【0004】[0004]
【発明が解決しようとする課題】しかし、このような改
良された電極線も、従来の黄銅製電極線と同様に引張強
度が充分とは言い難く、更に強度の高い放電加工用電極
線が求められていた。そこで本発明は、かかる従来技術
における問題に鑑み、更に高い引張強さを有していて加
工精度を高めることができ、かつ使用寿命が長い放電加
工用電極線の製造法を提供することを目的とした。However, such an improved electrode wire cannot be said to have a sufficient tensile strength similarly to the conventional brass electrode wire, and a higher strength electrode wire for electric discharge machining is required. Had been. Therefore, in view of the problems in the prior art, the present invention has an object to provide a method of manufacturing an electrode wire for electric discharge machining, which has a higher tensile strength, can improve machining accuracy, and has a long service life. And
【0005】[0005]
【課題を解決するための手段】本発明の放電加工用電極
線の製造法は、少量のアルミニウムを含有し且つ部分酸
化した銅合金粉末を不活性雰囲気中で熱処理することに
より酸化アルミニウムを含む還元銅粉末を得、かかる銅
粉末を熱加圧して成形体としたのち亜鉛を含む銅合金の
シースに真空下で封入し、これを熱間押出し加工して微
細な酸化アルミニウムを分散含有する強化銅芯材と黄銅
表層とを有する導電線を得ることを特徴とする。A method for manufacturing an electrode wire for electric discharge machining according to the present invention is directed to a reduction containing aluminum oxide by heat-treating a copper alloy powder containing a small amount of aluminum and partially oxidized in an inert atmosphere. Obtained copper powder, heat-pressurized the copper powder to form a compact, then encapsulated in a copper alloy sheath containing zinc under vacuum, and hot extruded this to strengthen the copper containing dispersed fine aluminum oxide. It is characterized in that a conductive wire having a core material and a brass surface layer is obtained.
【0006】[0006]
【発明の実施の形態】本発明の方法によって電極線を製
造するにあたり、芯材の原料として用いられる銅合金は
純銅と少量のアルミニウムとを配合して得られるもの
で、アルミニウムの含有量は0.1〜0.7重量%の範
囲内であるのが好ましい。アルミニウム含有量が少な過
ぎるときは加工性は良好であるが強度の向上が少なく、
逆に多すぎるときは機械的強度は高くなるが加工性が低
下するので、いずれも望ましくない。かかる銅合金は溶
融状態で水や蒸気などを用いて噴霧するか、又は銅粉末
とアルミニウム粉末とをボールミルなどの混合機中で粉
砕混合機して合金化するなどの方法で粉末状態としたも
のを使用することができる。BEST MODE FOR CARRYING OUT THE INVENTION In producing an electrode wire by the method of the present invention, a copper alloy used as a raw material of a core material is obtained by mixing pure copper and a small amount of aluminum, and the content of aluminum is 0. It is preferably in the range of 0.1 to 0.7% by weight. When the aluminum content is too low, the workability is good but the improvement in strength is small,
On the other hand, if the amount is too large, the mechanical strength will be high, but the workability will be deteriorated, so neither is desirable. Such a copper alloy is made into a powder state by spraying in a molten state using water, steam, or the like, or by alloying copper powder and aluminum powder by pulverizing and mixing in a mixer such as a ball mill. Can be used.
【0007】このような銅合金粉末は、必要に応じて加
熱状態で空気酸化するなどして表面を酸化させ、次いで
不活性雰囲気中で加熱処理して酸化銅を還元すると共
に、アルミニウムを酸化アルミニウムに転化する。こう
して得た酸化アルミニウム含有還元銅粉末は、必要に応
じて更に水素などの還元性雰囲気中で加熱して還元処理
し、プレスにより加圧して加圧成形体とするが、更に必
要に応じて加熱により焼結することもできる。Such a copper alloy powder oxidizes the surface by air oxidation or the like in a heated state, if necessary, then reduces the copper oxide by heat treatment in an inert atmosphere, and converts aluminum to aluminum oxide. Is converted to The aluminum oxide-containing reduced copper powder thus obtained is further subjected to a reduction treatment by heating it in a reducing atmosphere such as hydrogen, if necessary, and then pressurized by a press to form a pressed compact. Sintering.
【0008】上記のような銅粉末の加圧成形体を封入す
るシースは、亜鉛を含む銅合金、いわゆる黄銅で形成さ
れたものを用いる。かかる黄銅としては、亜鉛の含有量
が10〜40重量%の範囲にあるものが好ましく、亜鉛
の含有量が10重量%より少ないと引張強さの改良が十
分でなく、また亜鉛の含有量が40重量%より多いと耐
熱性や伸線加工性が低下するので、望ましくない。この
ような黄銅製のシースを用いることにより、優れた放電
特性と機械的強度及び耐劣化特性を備えた放電加工用電
極線を得ることができる。As the sheath for enclosing the above-mentioned copper powder press-formed body, a sheath made of a copper alloy containing zinc, so-called brass is used. The brass preferably has a zinc content in the range of 10 to 40% by weight. When the zinc content is less than 10% by weight, the tensile strength is not sufficiently improved, and the zinc content is If it exceeds 40% by weight, heat resistance and wire drawing workability are deteriorated, which is not desirable. By using such a brass sheath, it is possible to obtain an electrode wire for electric discharge machining having excellent electric discharge characteristics, mechanical strength and deterioration resistance characteristics.
【0009】銅粉末の加圧成形体を、上記のようなシー
スに真空下で封入してビレットを形成するが、こうして
得たビレットは押出し装置を用いて粗引き線とし、更に
伸線機により順に伸線して径0.1〜0.2mm程度まで
引き落とすことにより、放電加工用電極線に適した細線
が得られる。A press-molded body of copper powder is sealed in a sheath as described above under vacuum to form a billet. The billet thus obtained is formed into a roughly drawn wire by using an extruder, and further drawn by a wire drawing machine. By drawing the wire in order and pulling it down to a diameter of about 0.1 to 0.2 mm, a thin wire suitable for an electrode wire for electric discharge machining can be obtained.
【0010】[0010]
(実施例)純銅に対してアルミニウムを配合して、0.
35重量%のアルミニウムを含有する銅合金を得、これ
を溶融してジェット水流により粉末化し平均粒径が約2
0μmの粉末銅合金を得た。次いでこの粉末銅合金を大
気中で300〜350℃、10分間加熱して粉末粒子の
表面を酸化させ、更に酸素分圧が5×10-5Torr以下の
窒素雰囲気中で800℃に1時間加熱してアルミニウム
をアルミナに転化した。(Example) Aluminum was mixed with pure copper, and
A copper alloy containing 35% by weight of aluminum was obtained, which was melted and pulverized by a jet water flow to have an average particle size of about 2
A 0 μm powdered copper alloy was obtained. Then, this powdered copper alloy is heated in the air at 300 to 350 ° C. for 10 minutes to oxidize the surface of the powder particles, and further heated at 800 ° C. for 1 hour in a nitrogen atmosphere having an oxygen partial pressure of 5 × 10 −5 Torr or less. The aluminum was converted to alumina.
【0011】こうして得たアルミナ含有銅粉末を一旦粉
砕し、水素雰囲気中で500℃、1時間加熱して銅中に
残る酸素を除去したのち、6g/cm3 の密度となるよう
にプレスして成形体とした。そしてこの成形体を真空中
で500℃で加熱して、水分や吸着ガス等を除去すると
共に焼結し、次いで亜鉛10%の黄銅から形成された筒
内に、重量で黄銅筒の8倍の焼結体を挿入して真空密封
し、押出し成形用ビレットを得た。The alumina-containing copper powder thus obtained was once pulverized, heated in a hydrogen atmosphere at 500 ° C. for 1 hour to remove oxygen remaining in the copper, and then pressed to a density of 6 g / cm 3. It was a molded body. Then, this molded body is heated at 500 ° C. in a vacuum to remove moisture, adsorbed gas and the like and is sintered, and then, in a cylinder formed of brass of 10% zinc, the weight is 8 times that of the brass cylinder. The sintered body was inserted and vacuum-sealed to obtain an extrusion molding billet.
【0012】次に、このビレットを950℃に加熱し
て、ダイス温度300℃、押出し比76で熱間押出し成
形し、粗引き線を得た。こうして得た粗引き線を常法に
より順次に伸線して径0.2mmまで引き落とし、得られ
た細線Aについて、引張強さ(N/mm2 )、及び導電率
(%IACS)を測定した。なお、この細線Aの断面の金属
組成を調べたところ、表面の約5μmが黄銅組成を有し
ていた。Next, the billet was heated to 950 ° C. and hot extruded at a die temperature of 300 ° C. and an extrusion ratio of 76 to obtain a rough-drawn wire. The thus-obtained rough drawn wires were sequentially drawn by a conventional method and drawn down to a diameter of 0.2 mm, and the obtained thin wire A was measured for tensile strength (N / mm 2 ) and conductivity (% IACS). . When the metal composition of the cross section of the fine wire A was examined, about 5 μm on the surface had a brass composition.
【0013】(比較例)銅粉末の焼結体を黄銅製の筒内
に真空密閉する代わりに、同一形状の無酸素銅製の筒内
に挿入し真空密閉した他は、実施例と全く同様にして押
出し成形用ビレットを製造した。そして実施例と同様に
伸線して得た径0.2mmの細線Bについて同様に機械的
強度と導電性との測定をして、それらの結果を実施例の
測定結果と共に表1に示した。(Comparative Example) Except that the sintered body of copper powder was vacuum-sealed in a brass cylinder, it was inserted in a cylinder made of oxygen-free copper of the same shape and vacuum-sealed. To produce an extrusion molding billet. Then, similarly to the example, the mechanical strength and the conductivity of the thin wire B having a diameter of 0.2 mm obtained by drawing were measured, and the results are shown in Table 1 together with the measurement results of the example. .
【0014】なお参考のために、亜鉛含量が35重量%
の黄銅からなる径0.2mmの細線Cと、無酸素銅から製
造した径0.2mmの銅細線Dとについて測定した機械的
強度と導電性の値も、表1に併せて示した。この結果を
見ると、本発明の方法によって製造された細線Aは、黄
銅細線Cは勿論のこと、銅シースを用いて製造した細線
Bよりも一段と高い引張強さを有しており、放電加工用
電極線として、大きな引張応力に耐えることができるも
のであることがわかる。For reference, the zinc content is 35% by weight.
Table 1 also shows the values of mechanical strength and conductivity measured for the thin wire C of 0.2 mm in diameter made of brass and the thin wire D of 0.2 mm in diameter manufactured from oxygen-free copper. This result shows that the fine wire A manufactured by the method of the present invention has much higher tensile strength than the brass fine wire C and the fine wire B manufactured by using the copper sheath, and the electric discharge machining is performed. It can be seen that the electrode wire for use can withstand a large tensile stress.
【0015】[0015]
【表1】 [Table 1]
【0016】また、実施例の細線Aと、比較例の細線B
に亜鉛メッキを施した細線B′と、黄銅細線Cとについ
て、放電加工液中での放電特性を調べたところ、いずれ
も全く同等の放電特性を有していることが確かめられ
た。更に実施例の細線Aと比較例の黄銅細線Cについて
650℃における引張強さの変化を調べたところ、黄銅
細線Cは強度が常温の27%にまで低下したのに対し
て、細線Aは強度の低下が55%までで止まることが分
かった。Further, the thin line A of the example and the thin line B of the comparative example.
When the electric discharge characteristics of the thin wire B ′ plated with zinc and the thin brass wire C in the electric discharge machining liquid were examined, it was confirmed that they all had exactly the same electric discharge characteristics. Further, when the change in the tensile strength at 650 ° C. was examined for the thin wire A of the example and the brass thin wire C of the comparative example, the strength of the brass thin wire C was reduced to 27% of the room temperature, whereas the strength of the thin wire A was 27%. It was found that the decrease in the value of the value stopped at 55%.
【0017】[0017]
【発明の効果】本発明の放電加工用電極線の製造法によ
れば、従来の技術による電極線より高い強度、特に高温
での優れた強度を有し、且つ劣化が少ないので、放電加
工に使用して加工精度を維持することができる長寿命の
電極線が得られるという効果がある。EFFECTS OF THE INVENTION According to the method of manufacturing an electrode wire for electric discharge machining of the present invention, it has higher strength than the electrode wire according to the prior art, particularly excellent strength at high temperature, and less deterioration. There is an effect that a long-life electrode wire can be obtained which can be used to maintain processing accuracy.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成9年4月10日[Submission date] April 10, 1997
【手続補正1】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】0006[Correction target item name] 0006
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【0006】[0006]
【発明の実施の形態】本発明の方法によって電極線を製
造するにあたり、芯材の原料として用いられる銅合金は
純銅と少量のアルミニウムとを配合して得られるもの
で、アルミニウムの含有量は0.1〜0.7重量%の範
囲内であるのが好ましい。アルミニウム含有量が少な過
ぎるときは加工性は良好であるが強度の向上が少なく、
逆に多すぎるときは機械的強度は高くなるが加工性が低
下するので、いずれも望ましくない。かかる銅合金は溶
融状態で水や蒸気などを用いて噴霧するか、又は銅粉末
とアルミニウム粉末とをボールミルなどの混合機中で粉
砕混合して合金化するなどの方法で粉末状態としたもの
を使用することができる。BEST MODE FOR CARRYING OUT THE INVENTION In producing an electrode wire by the method of the present invention, a copper alloy used as a raw material of a core material is obtained by mixing pure copper and a small amount of aluminum, and the content of aluminum is 0. It is preferably in the range of 0.1 to 0.7% by weight. When the aluminum content is too low, the workability is good but the improvement in strength is small,
On the other hand, if the amount is too large, the mechanical strength will be high, but the workability will be deteriorated, so neither is desirable. Flour in such a copper or alloy is sprayed with water or steam in the molten state, or copper powder and blender of the aluminum powder ball mill etc.
It is possible to use a powder that has been powdered by a method such as crushing, mixing , and alloying.
Claims (2)
化した銅合金粉末を不活性雰囲気中で熱処理することに
より酸化アルミニウムを含む還元銅粉末を得、かかる銅
粉末を熱加圧して成形体としたのち亜鉛を含む銅合金の
シースに真空下で封入し、これを熱間押出し加工して微
細な酸化アルミニウムを分散含有する強化銅芯材と黄銅
表層とを有する導電線を得ることを特徴とする放電加工
用電極線の製造法。1. A reduced copper powder containing aluminum oxide is obtained by heat-treating a copper alloy powder containing a small amount of aluminum and partially oxidized in an inert atmosphere, and heat-pressurizing the copper powder to form a compact. After that, it is sealed in a sheath of a copper alloy containing zinc under vacuum, and is hot extruded to obtain a conductive wire having a reinforced copper core material containing fine aluminum oxide dispersed therein and a brass surface layer. Manufacturing method of electrode wire for electrical discharge machining.
が10〜40重量%の範囲にある黄銅を用いる、請求項
1に記載の放電加工用電極線の製造法。2. The method for producing an electrode wire for electric discharge machining according to claim 1, wherein brass having a zinc content in the range of 10 to 40 wt% is used as the copper alloy containing zinc.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14155696A JPH09323222A (en) | 1996-06-04 | 1996-06-04 | Manufacture of electrode wire for elector-discharge machining |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14155696A JPH09323222A (en) | 1996-06-04 | 1996-06-04 | Manufacture of electrode wire for elector-discharge machining |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH09323222A true JPH09323222A (en) | 1997-12-16 |
Family
ID=15294723
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14155696A Withdrawn JPH09323222A (en) | 1996-06-04 | 1996-06-04 | Manufacture of electrode wire for elector-discharge machining |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH09323222A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113823435A (en) * | 2021-09-08 | 2021-12-21 | 湖州金钛导体技术有限公司 | Composite electrode wire, preparation method and application of composite electrode wire |
-
1996
- 1996-06-04 JP JP14155696A patent/JPH09323222A/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113823435A (en) * | 2021-09-08 | 2021-12-21 | 湖州金钛导体技术有限公司 | Composite electrode wire, preparation method and application of composite electrode wire |
CN113823435B (en) * | 2021-09-08 | 2024-04-23 | 湖州金钛导体技术有限公司 | Composite electrode wire, preparation method and application thereof |
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