JP3517347B2 - Method of manufacturing copper-coated steel wire - Google Patents
Method of manufacturing copper-coated steel wireInfo
- Publication number
- JP3517347B2 JP3517347B2 JP02990898A JP2990898A JP3517347B2 JP 3517347 B2 JP3517347 B2 JP 3517347B2 JP 02990898 A JP02990898 A JP 02990898A JP 2990898 A JP2990898 A JP 2990898A JP 3517347 B2 JP3517347 B2 JP 3517347B2
- Authority
- JP
- Japan
- Prior art keywords
- copper
- steel wire
- wire
- coated
- coated steel
- 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 - Fee Related
Links
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、鋼線を芯材と
し、この芯材の周りを銅（銅合金を含む。以下同じ）で
被覆した銅被覆鋼線の製造方法に係り、特に鋼線と銅と
の接合性が高い高強度の銅被覆鋼線の製造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a copper-coated steel wire having a steel wire as a core material and surrounding the core material with copper (including a copper alloy; the same applies hereinafter), and particularly to a steel wire. The present invention relates to a method for producing a high-strength copper-coated steel wire having high bondability between copper and copper.
【０００２】[0002]
【従来の技術】鉄道用トロリ線等では、鋼線を芯材と
し、芯材の周りを銅で被覆した銅被覆鋼線を使用した銅
被覆鋼トロリ線が提案され、新幹線を代表とする高速運
行電車用として使用されている（特公平２−１１４６０
号公報参照）。この従来の銅被覆鋼トロリ線は、鋼線を
銅の溶湯中に連続的に浸漬させ、鋼線の周囲に銅を凝固
させて付着させた後、一定の温度範囲にて熱間圧延する
ことで銅被覆鋼素線をつくり、更にこれを伸線加工する
ことにより製造されている。2. Description of the Related Art For railway trolley wires and the like, a copper-coated steel trolley wire has been proposed, which uses a steel wire as a core material and a copper-coated steel wire in which the core material is coated with copper. It is used for trains (Japanese Patent Publication No. 2-1460).
(See Japanese Patent Publication). This conventional copper-coated steel trolley wire is obtained by continuously immersing the steel wire in a molten copper, solidifying and adhering the copper around the steel wire, and then hot rolling in a certain temperature range. It is manufactured by making a copper-coated steel wire with, and then drawing it.
【０００３】この従来の銅被覆鋼トロリ線の製造方法に
よると、鋼線を銅の溶湯中に浸漬させて鋼線表面に銅を
付着させる際、鋼線表面は銅との濡れ性を良くするため
非常に平滑かつ活性な状態でなくてはならない。このた
め、鋼線表面の前処理は非常に厳密なる管理が必要とさ
れている。具体的には鋼線表面の清浄化は当然として、
鋼線の平均表面粗さを０．５μｍ以下に平滑化しなくて
はならない。According to this conventional method for producing a copper-coated steel trolley wire, when the steel wire is dipped in a molten copper to adhere the copper to the surface of the steel wire, the surface of the steel wire improves the wettability with the copper. So it must be very smooth and active. Therefore, the pretreatment of the steel wire surface requires very strict control. Specifically, of course the cleaning of the steel wire surface,
The average surface roughness of the steel wire must be smoothed to 0.5 μm or less.
【０００４】一方、一般に用いられる酸洗い、ショット
ブラスト、ブラシ研磨等の前処理方法では、鋼線表面の
酸化皮膜等の汚れ分は除去できるものの、表面の平滑性
に乏しくなり、その結果、鋼線表面に銅を均一に付着、
凝固させることができず、銅と鋼芯との界面に空隙や接
合不良部を残してしまう。On the other hand, generally used pretreatment methods such as pickling, shot blasting, brush polishing, etc. can remove dirt such as oxide film on the surface of the steel wire, but the surface smoothness becomes poor, and as a result, steel Apply copper evenly to the wire surface,
It cannot be solidified, leaving voids and poorly joined portions at the interface between the copper and the steel core.
【０００５】このため、現在は鋼線表面を特殊な加工を
施した工具ダイス（以下皮剥ダイスと称する）により連
続的に皮剥しつつ、真空排気されたハウジング内に導入
し、その状態を保ったまま銅の溶湯中に浸漬する方法が
採られている。Therefore, at present, the surface of a steel wire is continuously peeled off by a tool die (hereinafter referred to as a peeling die) which has been subjected to a special process, and is introduced into a vacuum-evacuated housing to keep the state. The method of immersing it as it is in molten copper is adopted.
【０００６】[0006]
【発明が解決しようとする課題】しかし、この従来の製
造方法では、設備的に溶解炉、保持炉等非常に大がかり
であるため、その維持費、エネルギー費が高く、コスト
高である点や、上述のように皮剥ダイスを用いているこ
とから、この皮剥ダイスの寿命が短いという問題があっ
た。また従来の製造方法には、芯材として炭素含有量
０．３５重量％以下の強度の低い鋼線しか使用できない
という重大な欠点があった。これは、炭素含有量が０．
３５重量％を越えるようないわゆる硬鋼線を使用した場
合、製造中に皮剥ダイスの刃先が非常に欠け易くなり、
均一な皮剥ができなくなるためである。均一な皮剥がで
きなくなると、鋼線表面に均一に銅が付着できず、銅と
鋼芯間の接合性不良、伸線加工時の断線のさまざまなト
ラブルの原因になってしまう。更には、皮剥ダイスの寿
命が非常に短くなり予定長さの製品が生産できなくなっ
てしまう。However, in this conventional manufacturing method, since the melting furnace, the holding furnace and the like are very large in terms of equipment, the maintenance cost and energy cost are high and the cost is high. Since the peeling die is used as described above, there is a problem that the peeling die has a short life. Further, the conventional manufacturing method has a serious drawback that only a low strength steel wire having a carbon content of 0.35% by weight or less can be used as a core material. It has a carbon content of 0.
When a so-called hard steel wire exceeding 35% by weight is used, the blade edge of the peeling die is very likely to be chipped during manufacturing,
This is because uniform peeling cannot be performed. If uniform peeling cannot be achieved, copper cannot be evenly adhered to the surface of the steel wire, which causes various problems such as poor bondability between the copper and the steel core and disconnection during wire drawing. Furthermore, the life of the peeling die becomes very short, and it becomes impossible to produce a product of the expected length.
【０００７】このため従来の製造方法では、芯材となる
鋼線の炭素含有量は０．３５重量％以下に制限せざるを
得ず、従って得られる銅被覆鋼トロリ線の強度も国内で
標準的に使用されているトロリ線材の横断面積１１０ｍ
ｍ2サイズのもので６７ｋｇｆ／ｍｍ2、１７０ｍｍ2サ
イズのもので６６ｋｇｆ／ｍｍ2程度が最高となり、今
後の更なる高強度化には対応できない状況にあった。こ
の発明は、この様な点に鑑みなされたもので、硬鋼線材
を用いた高強度トロリ線として有効な銅被覆鋼線を製造
する方法を提供することを目的とする。Therefore, in the conventional manufacturing method, the carbon content of the steel wire as the core material must be limited to 0.35% by weight or less, and therefore the strength of the copper-coated steel trolley wire obtained is standard in Japan. Cross-sectional area of the trolley wire that is commonly used 110m
m about 66kgf / mm 2 is the best 2 of a size in those 67kgf / mm 2, 170mm 2 size, was in situation that can not respond to further strengthening the future. The present invention has been made in view of the above circumstances, and an object thereof is to provide a method for producing a copper-coated steel wire effective as a high-strength trolley wire using a hard steel wire.
【０００８】[0008]
【課題を解決するための手段】本発明者等は、前記課題
を解決するために鋭意実験研究を重ねた結果、従来の銅
溶湯浸漬による製造方法に代わり、金属の押し出し成形
機（コンフォーム・マシン）により鋼線の周囲に銅を押
出し被覆する方法により、鋼線と銅との接合性が高く、
炭素含有量０．３５％を越えるような硬鋼線材を使用し
た高強度銅被覆鋼トロリ線を安定に得ることができるこ
とを見出した。Means for Solving the Problems As a result of intensive experiments and researches for solving the above-mentioned problems, the inventors of the present invention have replaced a conventional manufacturing method by dipping copper molten metal with a metal extrusion machine (conform By the method of extruding and coating copper around the steel wire with a machine), the bondability between the steel wire and copper is high,
It has been found that a high-strength copper-coated steel trolley wire using a hard steel wire having a carbon content exceeding 0.35% can be stably obtained.
【０００９】即ちこの発明は、押し出し成形機により鋼
線の周囲に銅を押出し被覆して銅被覆鋼線を製造する方
法であって、前記押し出し成形機のダイチャンバに供給
する鋼線の断面積をＡ0とし、押し出し被覆後の鋼芯の
断面積をＡ1として、Ａ1がＡ0未満で且つ、Ａ0の７０％
以上となるように、ダイチャンバでの成形状態を調整す
ること特徴とする。That is, the present invention is a method for producing a copper-coated steel wire by extruding and coating copper around a steel wire by an extrusion molding machine, wherein the cross-sectional area of the steel wire supplied to the die chamber of the extrusion molding machine is and a 0, the cross-sectional area of the steel core after extrusion coated as a 1, a 1 is and less than a 0, 70% of a 0
It is characterized in that the molding state in the die chamber is adjusted as described above.
【００１０】この発明によると、押し出し成形機に供給
する鋼線の断面積Ａ0に対して、銅被覆後の鋼芯の断面
積Ａ1が小さくなるような高い被覆圧力、引落し率等の
成形状態で銅被覆を行うことにより、鋼線と銅との接合
性を高いものとすることができる。但し、余り被覆圧力
や引落し率等を高くすると、安定性に欠けることにな
る。鋼線と銅との接合性を高く保って連続的に安定して
銅被覆鋼線を得るためには、Ａ1がＡ0の７０％以上に止
まるような成形状態とすることが必要である。この発明
によると、硬鋼線材を用いた高強度トロリとして有効な
銅被覆鋼線を得ることができる。According to the present invention, with respect to the cross-sectional area A 0 of the steel wire supplied to the extrusion molding machine, such high coating pressure as to reduce the cross-sectional area A 1 of the steel core after copper coating, the drop rate, etc. By performing the copper coating in the molded state, the bondability between the steel wire and the copper can be enhanced. However, if the coating pressure, the withdrawal rate, etc. are too high, the stability becomes poor. In order to keep the bondability between the steel wire and copper high and to continuously and stably obtain the copper-coated steel wire, it is necessary to make the forming state such that A 1 is 70% or more of A 0. . According to the present invention, it is possible to obtain a copper-coated steel wire which is effective as a high-strength trolley using a hard steel wire.
【００１１】[0011]
【発明の実施の形態】以下、この本発明による銅被覆鋼
線の製造方法を図１及び図２を参照して具体的に説明す
る。図１は製造装置全体の模式的断面を示し、図２は押
し出し成形機１におけるダイチャンバの模式的断面を示
している。押し出し成形機１は、周面に溝が形成されて
回転駆動されるホイール１１と、このホイール１１に取
り付けられて周囲の溝の所定長さにわたる部分を覆って
金属素材の導入路１３を形成するシューブロック１２と
を有し、シューブロック１２内には押し出し成形用のダ
イチャンバ１４を有する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for manufacturing a copper-coated steel wire according to the present invention will be specifically described with reference to FIGS. 1 and 2. FIG. 1 shows a schematic cross section of the entire manufacturing apparatus, and FIG. 2 shows a schematic cross section of a die chamber in the extrusion molding machine 1. The extrusion molding machine 1 forms a groove 11 on a peripheral surface thereof, which is driven to rotate, and a wheel 11 which is attached to the wheel 11 and covers a peripheral portion of the groove extending over a predetermined length to form a metal material introduction path 13. And a shoe block 12, and a die chamber 14 for extrusion molding is provided in the shoe block 12.
【００１２】押し出される銅２は、表面の酸化皮膜、油
分等の汚れが完全に除去された状態で、成形機１の導入
路１３に連続的に引き込まれ、アバットメント１５で方
向を変えた後、ダイチャンバー１４の室内に供給され
る。このとき、導入路１３内、ダイチャンバー１４室内
の銅は、導入路１３とシューブロック１２との間で発生
する摩擦熱及び高圧力により可塑流動的となるが、ダイ
チャンバー１４室内における銅の温度、つまり押し出さ
れる銅の温度は好ましくは、６００℃乃至８００℃の温
度範囲にする。The copper 2 to be extruded is continuously drawn into the introduction passage 13 of the molding machine 1 in a state where the oxide film on the surface and dirt such as oil are completely removed, and after changing the direction by the abutment 15. , Is supplied to the inside of the die chamber 14. At this time, the copper inside the die chamber 14 and inside the die chamber 14 becomes plastic flow due to the frictional heat and high pressure generated between the inlet passage 13 and the shoe block 12, but the temperature of the copper inside the die chamber 14 That is, the temperature of the extruded copper is preferably in the temperature range of 600 ° C to 800 ° C.
【００１３】銅押し出し温度が６００℃未満であると、
可塑流動させる上での銅の変形抵抗やホイールにかかる
負荷が大きくなりすぎ、鋼線と銅との接合性において
も、拡散が不十分となる。また、銅押し出し温度が８０
０℃を越えると、銅の変形抵抗やホイールにかかる負荷
が小さくなり、鋼芯との接続性も良好となるが、一方で
導入路１３、アバットメント１５、ダイチャンバー１４
などの銅と接する部分の工具が高温に耐えられず、工具
の摩耗、損傷が激しくなってしまう。When the copper extrusion temperature is less than 600 ° C.,
In the plastic flow, the deformation resistance of copper and the load applied to the wheel become too large, and the diffusion becomes insufficient in the bondability between the steel wire and copper. Also, the copper extrusion temperature is 80
When the temperature exceeds 0 ° C, the deformation resistance of copper and the load on the wheel are reduced, and the connectivity with the steel core is improved, but on the other hand, the introduction passage 13, the abutment 15, the die chamber 14 are provided.
The tool in the part that comes into contact with copper cannot withstand the high temperature, and the tool becomes worn and damaged severely.
【００１４】芯材となる鋼線３は、前処理装置４によっ
て、表面が酸化皮膜や油分等のないように清浄化され、
かつ適当な表面粗さにまで平滑化される。その後、誘導
加熱装置５により表面を高温に加熱された状態で、無酸
化雰囲気に保たれた保護管９を通り、ニップル１６を介
して成形機１のダイチャンバー１４の室内に誘導され
る。ニップル１６を介してダイチャンバー１４の室内に
誘導された鋼線３は、上述のように別方向から同室内に
侵入して可塑流動化された銅１９に包まれ、圧着されて
銅被覆鋼線２０となってダイス１７を通って押し出さ
れ、以降、冷却槽６、引き取り機７を通って巻き取り機
８により連続して巻き取られる。The steel wire 3 serving as the core material is cleaned by the pretreatment device 4 so that the surface is free of oxide film, oil, etc.
And it is smoothed to an appropriate surface roughness. Then, while the surface is heated to a high temperature by the induction heating device 5, it is guided into the chamber of the die chamber 14 of the molding machine 1 through the nipple 16 through the protective tube 9 kept in the non-oxidizing atmosphere. The steel wire 3 guided into the chamber of the die chamber 14 through the nipple 16 is wrapped in the plasticized copper 19 that has entered the chamber from another direction as described above, and is crimped to form a copper-coated steel wire. Then, it is pushed out through the die 17 and then continuously wound up by the winder 8 through the cooling tank 6 and the take-up machine 7.
【００１５】この実施例において、鋼線と銅との接合性
を高くするためには、ダイチャンバ１４内で、鋼芯が変
形する程の高圧力で銅を鋼線に被覆圧着することが必要
である。具体的には、図２に示すように、押し出し被覆
前の鋼線３の断面積をＡ0とし、押し出し被覆後の銅被
覆鋼線２０の鋼芯２１の断面積をＡ1としたとき、Ａ1が
Ａ0よりも小さくなるように、即ち両断面積の間に有意
差が認められる程度に、成形状態（被覆圧力，引落し率
等）を設定する。被覆後の鋼芯２１の断面積が被覆前の
鋼線３のそれと変わらないような押し出し条件では、鋼
芯と銅との境界は物理的な密着のみとなり、金属的な接
合は得られず、特に鋼線３の表面の凹凸が大きい場合、
鋼線表面の凹部が銅の圧力でも圧着されずに銅と鋼線の
界面に空隙として残存してしまう。この様に界面に残存
した空隙は、多い場合には銅と鋼芯の接合不良の原因と
なり、屋外等の環境下でひび割れ等によって接合界面が
露出した場合、雨水等が侵入して空隙部から腐食が進行
する、といった問題を生じる。In this embodiment, in order to enhance the bondability between the steel wire and the copper, it is necessary to cover and crimp the copper on the steel wire in the die chamber 14 at a pressure high enough to deform the steel core. is there. Specifically, as shown in FIG. 2, when the cross-sectional area of the steel wire 3 before extrusion coating is A 0 and the cross-sectional area of the steel core 21 of the copper-coated steel wire 20 after extrusion coating is A 1 , The molding state (coating pressure, withdrawal rate, etc.) is set so that A 1 is smaller than A 0 , that is, a significant difference is observed between both cross-sectional areas. Under extrusion conditions such that the cross-sectional area of the steel core 21 after coating is the same as that of the steel wire 3 before coating, the boundary between the steel core and copper is only physical contact, and metallic joining cannot be obtained. Especially when the unevenness of the surface of the steel wire 3 is large,
The recesses on the surface of the steel wire are not crimped by the pressure of copper and remain as voids at the interface between the copper and the steel wire. If there are many voids remaining at the interface like this, it will cause poor joint between the copper and steel core.If the joint interface is exposed due to cracks etc. in the environment such as outdoors, rainwater will invade from the voids. This causes problems such as corrosion progressing.
【００１６】一方、鋼線と銅との接合性の高い銅被覆鋼
線を連続して長く安定に得るためには、銅被覆鋼線２０
の鋼芯２１の断面積Ａ1が、初期の断面積Ａ0の７０％以
上であることが必要である。鋼芯２１の断面積Ａ1が初
期の断面積Ａ0の７０％未満となるまで変形させると、
鋼芯と銅の接合は強固になるものの、銅の圧力変動、押
し出し時の巻き取り張力の変動等により鋼芯径が大きく
変動してしまい、得られる銅被覆鋼線の長手方向の機械
的特性のバラツキが大きくなり、連続して長い製品を作
る場合に安定性が保証されなくなるためである。On the other hand, in order to continuously and stably obtain a copper-coated steel wire having a high bondability between the steel wire and copper, the copper-coated steel wire 20
It is necessary that the sectional area A 1 of the steel core 21 of No. 2 is 70% or more of the initial sectional area A 0 . When the sectional area A 1 of the steel core 21 is deformed to less than 70% of the initial sectional area A 0 ,
Although the joint between the steel core and copper becomes strong, the steel core diameter changes greatly due to fluctuations in the copper pressure, fluctuations in the winding tension during extrusion, etc., and the resulting mechanical properties of the copper-coated steel wire in the longitudinal direction. This is because there is a large variation and the stability cannot be guaranteed when continuously producing long products.
【００１７】以上のように、押し出し成形の場合には、
鋼線の周囲に銅を高圧で圧接、圧着させ、押し出し被覆
することにより、使用上十分な接合性を得ることができ
ることから、鋼線の前処理は従来の皮剥ダイスによる方
法とは異なり、通常の酸洗い、ブラスト、ブラシ研磨等
を１台もしくは複数台で行うか、または組み合わせて使
用し、清浄化と適当な平滑化を行うことで十分である。
従って、芯材となる鋼線３を炭素量の少ない鋼種に限定
する必要はなくなり、炭素含有量が０．３５重量％を越
えるような硬鋼線材を使用して、更なる高強度銅被覆鋼
線や高強度銅被覆トロリ線を製造することができる。ま
た押し出し成形による製造方法で高強度銅被覆鋼トロリ
線を製造する場合は、従来と同様に丸線で押し出し、そ
の後、伸線加工を行ってトロリ線形状に仕上げることも
可能であるが、ダイスを選ぶことにより、トロリ線形状
に近い形状でもって押し出し、その後の伸線工程を簡略
化することも可能である。As described above, in the case of extrusion molding,
Pre-treatment of the steel wire is different from the conventional method using a peeling die, because it is possible to obtain sufficient bondability in use by pressing and crimping copper around the steel wire at a high pressure and extruding and covering it. It is sufficient to carry out the cleaning and appropriate smoothing by carrying out the acid washing, blasting, brush polishing, etc. by one unit or plural units or by using them in combination.
Therefore, it is not necessary to limit the steel wire 3 as the core material to a steel type having a low carbon content, and a hard steel wire material having a carbon content of more than 0.35% by weight is used to further improve the strength of the copper-coated steel. Wire and high strength copper coated trolley wire can be manufactured. When manufacturing a high-strength copper-coated steel trolley wire by a manufacturing method by extrusion, it is possible to extrude with a round wire as in the conventional method and then perform wire drawing to finish the trolley wire shape. By selecting, it is possible to extrude with a shape close to the trolley wire shape and simplify the subsequent wire drawing step.
【００１８】以下、高強度銅被覆鋼線の製造実施例につ
いて、比較例と共に具体的に説明する。材料は、被覆さ
れる銅素材として、ＪＩＳ Ｃ １０２０の無酸素銅線
（外径：１２ｍｍφ）を用い、芯材となる鋼線には、Ｊ
ＩＳ Ｇ ３５０６に示されるＳＷＲＨ６２Ａ硬鋼線（炭
素含有量：０．６３重量％，外径１１ｍｍφ）とＳＷＲ
Ｈ８２Ａ硬鋼線（炭素含有量：０．８０重量％，外径１
１ｍｍφ）の２種類を用いた。まず、押し出し条件の比
較を行うために、ＳＷＲＨ６２Ａ硬鋼線（炭素含有量：
０．６３重量％，外径１１ｍｍφ）を用いて各種押し出
し条件下で押し出しを行い、その押し出し性と押し出さ
れた銅被覆鋼線の特性評価を行った。銅線は、表面の酸
化皮膜、油分等汚れを十分に除去した後、押し出し成形
機の導入路に連続的に供給した。芯材となる鋼線は、シ
ョットブラストによって表面の酸化皮膜、油分等を除去
した後、誘導加熱装置によって表面を高温に加熱させた
状態でダイチャンバーの室内に誘導し、ダイチャンバー
室内において銅を被覆して、ダイスにより外径２２ｍｍ
φの銅被覆鋼線として押し出した。Hereinafter, examples of manufacturing high-strength copper-coated steel wire will be specifically described together with comparative examples. The material used was a JIS C 1020 oxygen-free copper wire (outer diameter: 12 mmφ) as the copper material to be coated.
SWRH62A hard steel wire (carbon content: 0.63% by weight, outer diameter 11 mmφ) and SWR shown in IS G 3506
H82A hard steel wire (carbon content: 0.80% by weight, outer diameter 1
1 mmφ) was used. First, in order to compare the extrusion conditions, the SWRH62A hard steel wire (carbon content:
Using 0.63% by weight and an outer diameter of 11 mmφ, extrusion was performed under various extrusion conditions, and the extrudability and the characteristics of the extruded copper-coated steel wire were evaluated. The copper wire was sufficiently supplied with the oxide film on the surface and dirt such as oil content, and then continuously supplied to the introduction path of the extrusion molding machine. After removing the oxide film, oil, etc. on the surface of the steel wire as the core material by shot blasting, the induction heating device guides the surface of the steel wire to the die chamber while heating the surface to a high temperature. Coated and dies 22 mm in outer diameter
Extruded as φ copper-coated steel wire.
【００１９】実施例及び比較例の押し出し条件を下記表
１に示す。ダイチャンバ室内において、ダイスとニップ
ルとの間隔を調整することにより、鋼芯表面に作用する
銅の圧力を変化させ、その結果押し出される銅被覆鋼線
における鋼芯の線径を様々に振った押し出しを行った。
押し出しにおいては、押し出し前の鋼線の線速と押し出
される銅被覆鋼線の線速をそれぞれ計測し、その線速の
比率により、被覆前の鋼線の断面積Ａ0と銅被覆後の鋼
芯の断面積Ａ1との比率（減面比）を計測した。The extrusion conditions of Examples and Comparative Examples are shown in Table 1 below. By adjusting the distance between the die and the nipple in the die chamber, the pressure of the copper acting on the surface of the steel core is changed, and as a result, extrusion is performed by varying the diameter of the steel core in the copper-coated steel wire that is extruded. went.
In extrusion, the linear velocity of the steel wire before extrusion and the linear velocity of the copper-coated steel wire to be extruded are respectively measured, and the ratio of the linear velocities determines the cross-sectional area A 0 of the steel wire before coating and the steel after copper coating. The ratio (area reduction ratio) to the cross-sectional area A 1 of the core was measured.
【００２０】[0020]
【表１】 [Table 1]
【００２１】押し出された銅被覆鋼線について、銅と鋼
芯との接合性及び接合界面の状態について評価を行っ
た。また、押し出された銅被覆鋼線を長手方向に数百ｍ
毎に切断し、各所のサンプルについて引張試験を行っ
て、機械的特性の安定性を評価した。接合性について
は、カッターで切断した切断破面と、長手方向の引張試
験の際の引張破面について、１０倍の拡大鏡により銅と
鋼芯の間に剥離がないかどうかを観察した。また接合界
面の状態については、接合界面を露出させた状態で５％
の塩化ナトリウム溶液に浸した塩水浸漬試験と、ＪＩＳ
Ｚ２３７１に示す塩水噴霧試験の２種類の試験を連続１
０００時間行い、１０００時間後の界面の腐食状況を観
察した。以上の評価結果を、下記表２に示す。With respect to the extruded copper-coated steel wire, the bondability between copper and the steel core and the condition of the bonding interface were evaluated. Also, the extruded copper-coated steel wire is several hundred meters in the longitudinal direction.
Each piece was cut, and a tensile test was performed on samples at various positions to evaluate the stability of mechanical properties. Regarding the bondability, with respect to the cut fracture surface cut by a cutter and the tensile fracture surface during the tensile test in the longitudinal direction, it was observed with a 10 × magnifying glass whether or not there was peeling between the copper and the steel core. Regarding the state of the joint interface, 5% when the joint interface is exposed.
Salt water immersion test immersed in sodium chloride solution of JIS and JIS
Two kinds of tests of salt spray test shown in Z2371
It was performed for 000 hours, and the corrosion state of the interface after 1000 hours was observed. The above evaluation results are shown in Table 2 below.
【００２２】[0022]
【表２】 [Table 2]
【００２３】表２において、接合性の判定基準は、○が
剥離なく良好、△が剥離少ないが接合不十分、×が剥離
多く接合なし、である。腐食試験判定基準は、○が腐食
による隙間少なく良好、×が隙間多く不良、である。製
造安定性の判定基準は、○が長手方向で特性のバラツキ
小さく良好、×が特性のバラツキが多い、である。In Table 2, the criteria for the bondability are as follows: ◯ is good without peeling, Δ is little peeling but insufficient joining, X is much peeling and no joining. Corrosion test criteria are good when there are few gaps due to corrosion and good when there are many gaps due to corrosion. The criterion for manufacturing stability is that the goodness is good with little variation in characteristics in the longitudinal direction, and the good quality is great with x.
【００２４】表２の結果から、実施例Ｎｏ.１〜４は、
銅と鋼芯の接合性が良好であり、長手方向の製造の安定
性も十分であることが確認された。鋼芯を変形させない
ようにした比較例Ｎｏ．５では、銅と鋼芯の接合性が不
十分であった上、２つの腐食試験において接合界面から
優先的な腐食が認められ、銅と鋼芯の間に数百μｍから
数ｍｍの隙間ができていることが確認された。また、鋼
芯を過度に変形させた比較例Ｎｏ．６〜８では、銅と鋼
芯の接合性は良好であったものの、押し出される銅被覆
鋼線の線速が安定せず、長手方向に鋼芯径が大きく変化
し、長手方向に機械的特性が大きくばらついた。From the results of Table 2, Examples Nos. 1 to 4 are
It was confirmed that the bondability between the copper and the steel core was good, and the manufacturing stability in the longitudinal direction was also sufficient. Comparative example No. 1 in which the steel core was not deformed In No. 5, the bondability between the copper and the steel core was insufficient, and preferential corrosion was observed from the bonding interface in the two corrosion tests, and a gap of several hundred μm to several mm was formed between the copper and the steel core. It was confirmed that it was done. Further, Comparative Example No. 1 in which the steel core was excessively deformed. In Nos. 6 to 8, the bondability between the copper and the steel core was good, but the wire speed of the extruded copper-coated steel wire was not stable, the steel core diameter changed significantly in the longitudinal direction, and the mechanical properties in the longitudinal direction were increased. Has greatly varied.
【００２５】以上の結果に基づき、次に、製造条件をこ
の発明の範囲に設定して、鋼芯に１１．０ｍｍφのＳＷ
ＲＨ６２Ａ硬鋼線（炭素含有量：０．６３重量％）と、
ＳＷＲＨ８２Ａ硬鋼線（炭素含有量：０．８０重量％）
の２種類を用いた銅被覆鋼線を製造した。各銅被覆鋼線
の外径は２２ｍｍφとし、中の鋼芯は１０．０ｍｍφに
なるように調節した。これらの銅被覆鋼線を押し出し
後、冷間伸線加工によって、１１０ｍｍ2，１７０ｍｍ2
の各サイズの銅被覆鋼トロリ線に仕上げ、その引張強さ
と導電率を測定した。これら銅被覆鋼トロリ線の製造条
件と評価結果を、下記表３に示す。Based on the above results, next, the manufacturing conditions are set within the range of the present invention, and the SW of 11.0 mmφ is applied to the steel core.
RH62A hard steel wire (carbon content: 0.63% by weight),
SWRH82A hard steel wire (carbon content: 0.80% by weight)
A copper-coated steel wire was manufactured using the two types. The outer diameter of each copper-coated steel wire was 22 mmφ, and the inner steel core was adjusted to 10.0 mmφ. After extruding these copper-coated steel wires, by cold drawing, 110 mm 2 , 170 mm 2
Each size of copper-coated steel trolley wire was finished, and its tensile strength and conductivity were measured. Table 3 below shows manufacturing conditions and evaluation results of these copper-coated steel trolley wires.
【００２６】[0026]
【表３】 [Table 3]
【００２７】表３には、炭素含有量が多い実施例Ｎｏ．
９〜１２の他、炭素含有量が従来品と同程度に少ない実
施例Ｎｏ．１３，１４を併せて示している。炭素含有量
が多い鋼線を用いた実施例Ｎｏ．９〜１２では、鋼線自
体の強度が高く、同じ導電率を有しながら、強度の高い
銅被覆鋼トロリ線を得ることができた。Table 3 shows Example No. 3 having a large carbon content.
In addition to Nos. 9 to 12, Example No. 9 having a carbon content as low as that of the conventional product. 13 and 14 are also shown together. Example No. 1 using a steel wire with a high carbon content. In Nos. 9 to 12, the strength of the steel wire itself was high, and a copper-coated steel trolley wire having high strength while having the same conductivity could be obtained.
【００２８】実施例においては、芯材として最も安価で
強度の高い硬鋼線を使用したが、軽量化や更なる高強度
化を図るために、ステンレス鋼等の合金鋼や、チタン、
チタン合金、更に炭素繊維等を含む繊維強化金属線等を
用いることもできる。また、芯材の長手方向に垂直な面
の断面形状は、例えば円、楕円又は矩形とすることもで
きる。In the examples, the most inexpensive and high-strength hard steel wire was used as the core material, but alloy steel such as stainless steel, titanium, titanium, etc. were used in order to reduce the weight and further increase the strength.
It is also possible to use a titanium alloy, a fiber-reinforced metal wire containing carbon fiber, or the like. Further, the cross-sectional shape of the surface perpendicular to the longitudinal direction of the core material may be, for example, a circle, an ellipse or a rectangle.
【００２９】[0029]
【発明の効果】以上述べたように、この発明によれば、
押し出し成形によって鋼線の周囲に銅を高圧力で押出し
被覆することから、芯材となる鋼線に制限が少なく、炭
素含有量が０，３５重量％を越えるような硬鋼線材を使
用した高強度銅被覆鋼線を製造することができる。As described above, according to the present invention,
Since copper is extruded and coated around the steel wire by extrusion at a high pressure, there are few restrictions on the steel wire used as the core material, and a high-strength steel wire with a carbon content exceeding 0.35% by weight is used. High strength copper coated steel wire can be manufactured.
【図１】 この発明の実施例による製造装置の模式的断
面図である。FIG. 1 is a schematic sectional view of a manufacturing apparatus according to an embodiment of the present invention.
【図２】 同製造装置の押し出し成形機におけるダイチ
ャンバの模式的断面図である。FIG. 2 is a schematic cross-sectional view of a die chamber in an extrusion molding machine of the manufacturing apparatus.
１…押し出し成形機、２…銅 ３…鋼線、４…前処理装
置、５…誘導加熱装置、６…冷却槽、７…引き取り機、
８…巻き取り機、９…保護管、１１…ホイール、１２…
シューブロック、１３…導入路、１４…ダイチャンバ、
１５…アバットメント、１６…ニップル、１７…ダイ
ス、１９…銅、２０…銅被覆鋼線、２１…鋼芯。DESCRIPTION OF SYMBOLS 1 ... Extrusion molding machine, 2 ... Copper 3 ... Steel wire, 4 ... Pretreatment apparatus, 5 ... Induction heating apparatus, 6 ... Cooling tank, 7 ... Take-up machine,
8 ... Winder, 9 ... Protective tube, 11 ... Wheel, 12 ...
Shoe block, 13 ... Introduction path, 14 ... Die chamber,
15 ... Abutment, 16 ... Nipple, 17 ... Die, 19 ... Copper, 20 ... Copper coated steel wire, 21 ... Steel core.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平８−142719（ＪＰ，Ａ) 特開 昭57−159213（ＪＰ，Ａ) 特開 昭59−220211（ＪＰ，Ａ) 特開 昭57−49120（ＪＰ，Ａ) 特開 昭57−142711（ＪＰ，Ａ) 特開 昭59−42117（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B21C 23/24 B60M 1/13 ─────────────────────────────────────────────────── --Continued from the front page (56) Reference JP-A-8-142719 (JP, A) JP-A-57-159213 (JP, A) JP-A-59-220211 (JP, A) JP-A-57- 49120 (JP, A) JP-A-57-142711 (JP, A) JP-A-59-42117 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) B21C 23/24 B60M 1 /13
Claims (2)
は銅合金を押し出し被覆して銅被覆鋼線を製造する方法
であって、 前記押し出し成形機のダイチャンバに供給する鋼線の断
面積をＡ0とし、押し出し被覆後の鋼芯の断面積をＡ1と
して、Ａ1がＡ0未満で且つ、Ａ0の７０％以上となるよ
うに、ダイチャンバでの成形状態を調整することを特徴
とする銅被覆鋼線の製造方法。1. A method for producing a copper-coated steel wire by extrusion-coating copper or a copper alloy around a steel wire with an extrusion molding machine, the cross-sectional area of the steel wire being supplied to a die chamber of the extrusion molding machine. and a 0, the cross-sectional area of the steel core after extrusion coated as a 1, a 1 is and less than a 0, such that 70% or more of a 0, and characterized by adjusting the molding conditions in the die chamber Method for producing copper-coated steel wire.
５重量％を越える鋼線を用いたトロリ線であることを特
徴とする請求項１記載の銅被覆鋼線の製造方法。2. The copper-coated steel wire has a carbon content of 0.3.
The method for producing a copper-coated steel wire according to claim 1, which is a trolley wire using a steel wire exceeding 5% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02990898A JP3517347B2 (en) | 1998-02-12 | 1998-02-12 | Method of manufacturing copper-coated steel wire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02990898A JP3517347B2 (en) | 1998-02-12 | 1998-02-12 | Method of manufacturing copper-coated steel wire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11226629A JPH11226629A (en) | 1999-08-24 |
| JP3517347B2 true JP3517347B2 (en) | 2004-04-12 |
Family
ID=12289101
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| JP02990898A Expired - Fee Related JP3517347B2 (en) | 1998-02-12 | 1998-02-12 | Method of manufacturing copper-coated steel wire |
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| Publication number | Publication date |
|---|---|
| JPH11226629A (en) | 1999-08-24 |
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