JP5252941B2 - Pressure bonding structure and wire harness using Al plated steel wire - Google Patents
Pressure bonding structure and wire harness using Al plated steel wire Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims description 82
- 239000010959 steel Substances 0.000 title claims description 82
- 238000002788 crimping Methods 0.000 claims description 44
- 238000007747 plating Methods 0.000 claims description 37
- 239000011248 coating agent Substances 0.000 claims description 18
- 238000000576 coating method Methods 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000010949 copper Substances 0.000 description 37
- 238000005259 measurement Methods 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 229910000838 Al alloy Inorganic materials 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 239000004020 conductor Substances 0.000 description 6
- 238000009413 insulation Methods 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 239000011247 coating layer Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000009864 tensile test Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000879 optical micrograph Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
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- Non-Insulated Conductors (AREA)
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- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
Description
本発明は、自動車のワイヤーハーネス用素線に適した径の細いＡｌめっき鋼線を複数本束ねた状態で端子部品に圧着にて固定してなる圧着接合構造、およびその圧着接合構造を有するワイヤーハーネスに関する。 The present invention relates to a crimp bonding structure in which a plurality of thin Al-plated steel wires having a small diameter suitable for a wire harness of an automobile are bundled and fixed to a terminal component by crimping, and a wire having the crimp bonding structure Regarding the harness.
自動車のワイヤーハーネスは多数の導線により構成されており、それぞれの導線はさらに数本〜数十本の「素線」を束ねることによって作られている。近年、軽量化、コンパクト化のニーズが高まり、ワイヤーハーネスにも細線化の要求が強くなっている。また、自動車解体時の分別回収作業をできるだけ不要にするために、ワイヤーハーネス用の導線にはリサイクル性の良い構成のものが強く望まれるようになってきた。 An automobile wire harness is composed of a large number of conductors, and each conductor is made by bundling several to several tens of “elements”. In recent years, there has been an increasing need for weight reduction and compactness, and there is an increasing demand for thinning wire harnesses. In addition, in order to eliminate the need for separate collection work at the time of car disassembly, a wire harness for a wire harness having a highly recyclable structure has been strongly desired.
ワイヤーハーネスを構成する各導線は接続用の端子部品に「かしめ加工」により圧着で締結されることが多く、圧着部で容易に破断することがないように、個々の素線にはある程度の強度が要求される。現状の信号用ワイヤーハーネス導線用の素線には、Ｃｕ素線の場合は直径約０.３ｍｍ以上、Ａｌ素線の場合には直径１ｍｍ以上の線径を確保することが望まれている。それより細い場合は強度不足により圧着部の固定端部近傍での素線破断が問題となりやすい。 Each wire that constitutes the wire harness is often fastened by crimping to the terminal parts for connection by “caulking”, and each individual wire has a certain degree of strength so that it does not break easily at the crimping part. Is required. It is desired to secure a wire diameter of about 0.3 mm or more in the case of the Cu wire and 1 mm or more in the case of the Al wire for the current wire for the signal wire harness conductor. If it is thinner, the wire breakage near the fixed end of the crimping part tends to be a problem due to insufficient strength.
リサイクル性の観点では、鉄のリサイクルにとって阻害元素となるＣｕよりも、鉄スクラップとともに溶解可能なＡｌの方が優れている。電気伝導性の面では、ＡｌはＣｕに比べ体積抵抗率が大きいが、微弱電流を流す信号用ワイヤーハーネスの場合、Ａｌ素線でも問題ない。しかしながら、Ａｌ素線は上記のように強度不足を解消するために太い線径のものを採用せざるを得ず、コンパクト化のニーズに十分応えられない。 From the viewpoint of recyclability, Al, which can be dissolved together with iron scrap, is superior to Cu, which is an inhibitory element for iron recycling. In terms of electrical conductivity, Al has a larger volume resistivity than Cu, but in the case of a signal wire harness that allows a weak current to flow, there is no problem with Al strands. However, the Al wire has to employ a thick wire diameter in order to solve the shortage of strength as described above, and cannot fully meet the needs for compactness.
一方、高強度・高耐食性が要求される用途において、鋼線を芯線とするＡｌめっき鋼線が知られている（特許文献１〜３）。特許文献１には漁網ロープ用、送電線の補強用、海底光ファイバーケーブル補強用等のワイヤーに使用するＡｌめっき鋼線が記載されている。特許文献１の実施例に開示されている鋼線は線径２〜１３ｍｍと太いものであり、Ａｌめっきの目的は耐食性改善である。特許文献２のＡｌめっき鋼線も金網等の海水耐食用途等を想定したものであり、線径３.５ｍｍという太径のものが例示されている（段落０００８、０００９）。特許文献３のＡｌめっき線材は高強度ボルト用であり、その図２には７ｍｍ径のものが示されている。ワイヤーハーネスの素線に使用できるような低抵抗かつ細径のＡｌめっき鋼線はまだ実現されていない。 On the other hand, in applications that require high strength and high corrosion resistance, Al-plated steel wires having steel wires as core wires are known (Patent Documents 1 to 3). Patent Document 1 describes an Al-plated steel wire used for wires for fishing net ropes, power line reinforcement, submarine optical fiber cable reinforcement, and the like. The steel wire disclosed in the example of Patent Document 1 is as thick as 2 to 13 mm in wire diameter, and the purpose of Al plating is to improve corrosion resistance. The Al-plated steel wire of Patent Document 2 is also intended for seawater corrosion-resistant applications such as wire mesh, and a wire diameter of 3.5 mm is exemplified (paragraphs 0008 and 0009). The Al-plated wire of Patent Document 3 is for high-strength bolts, and FIG. A low-resistance and small-diameter Al-plated steel wire that can be used as a wire of a wire harness has not yet been realized.
本発明は、ワイヤーハーネスに適した細径の素線であって、端子部品との圧着部において、従来のＣｕ素線と同等以上の耐久性を安定して呈し、かつリサイクル性にも優れた線材を端子部品に固定してなる耐久性の高い圧着接合構造、およびその圧着接合構造を有するワイヤーハーネスを提供することを目的とする。 The present invention is a thin wire suitable for a wire harness, and stably exhibits durability equal to or higher than that of a conventional Cu wire in a crimped portion with a terminal component, and also has excellent recyclability. and to provide a wire harness having high compression bonding structure durable formed of a fixed wire on the pin parts, and the compression bonding structure.
上記目的を達成するために、本発明では、鋼芯線の周囲にＡｌめっき被覆を有する直径（円相当径）Ｄが０.１〜０.６ｍｍのＡｌめっき鋼線であって、
（１）当該Ａｌめっき鋼線（直径＝Ｄ）の単位長さあたりの常温での電気抵抗をρ1（Ω／ｍ）、直径（円相当径）がＤであるＣｕ線の単位長さあたりの常温での電気抵抗をρCu（Ω／ｍ）と表すとき、ρ1／ρCu≦６が成立し、
（２）引張強さσ1が２５０Ｎ／ｍｍ2以上であり、
（３）長手方向に垂直な断面において、断面全体に占める鋼芯線の面積率が６０％未満である、
ワイヤーハーネス用Ａｌめっき鋼線を用いる。
In order to achieve the above object, the present invention is an Al plated steel wire having a diameter (equivalent circle diameter) D of 0.1 to 0.6 mm having an Al plating coating around the steel core wire,
(1) Per unit length of Cu wire having a ρ 1 (Ω / m) electrical resistance at room temperature per unit length of the Al-plated steel wire (diameter = D) and a diameter (equivalent circle diameter) of D When the electrical resistance at room temperature is expressed as ρ Cu (Ω / m), ρ 1 / ρ Cu ≦ 6 holds,
(2) Tensile strength sigma 1 is Ri der 250 N / mm 2 or more,
(3) In the cross section perpendicular to the longitudinal direction, the area ratio of the steel core wire in the entire cross section is less than 60%.
Using Al plated steel wire for wire harness.
ここで、ρCuはＣｕ線の体積抵抗率を１.７２μΩ・ｃｍとして算出される値を採用する。当該Ａｌめっき鋼線の長手方向に垂直な断面の断面積をＳ（ｍｍ2）、円周率をπとするとき、Ｓ＝πＤ2／４によって定まるＤ（ｍｍ）を当該Ａｌめっき鋼線の円相当径という。「Ａｌめっき被覆」は、Ｓｉ含有量が０〜１５質量％、Ｆｅ含有量が０〜３質量％の溶融Ａｌめっき浴に浸漬することにより形成されるめっき被覆層である。 Here, ρ Cu adopts a value calculated assuming that the volume resistivity of Cu wire is 1.72 μΩ · cm. The cross-sectional area of a cross section perpendicular to the longitudinal direction of the Al-plated steel wire S (mm 2), when the circular constant [pi, the D (mm) defined by S = πD 2/4 of the Al-plated steel wire The equivalent circle diameter. The “Al plating coating” is a plating coating layer formed by immersing in a molten Al plating bath having a Si content of 0 to 15 mass% and an Fe content of 0 to 3 mass%.
本発明では、上記のＡｌめっき鋼線からなる素線を複数本束ねた状態で端子部品に圧着にて固定してなる圧着接合構造であって、上記複数本の個々の素線がすべて、圧着部引張強さσAが２００Ｎ／ｍｍ2以上で端子部品に固定されている圧着接合構造が提供される。さらに、その圧着接合構造を有するワイヤーハーネスが提供される。圧着部で素線束を囲むように把持している金具の内部構造として、鋼芯線より優先的に変形して潰れたＡｌめっき被覆に由来するＡｌ相が各鋼芯線の存在領域の残部を充填しているものが挙げられる。 In the present invention, a plurality of the above-mentioned Al-plated steel wires are bonded together by crimping to a terminal component in a state where a plurality of strands are bundled, and the plurality of individual strands are all crimped. A crimp bonding structure in which the partial tensile strength σ A is 200 N / mm 2 or more and is fixed to the terminal component is provided. Furthermore, a wire harness having the crimp bonding structure is provided. As the internal structure of the metal fitting gripped so as to surround the wire bundle at the crimping part, the Al phase derived from the Al plating coating that has been deformed and crushed preferentially over the steel core wire fills the remainder of the existing area of each steel core wire. Are listed.
「端子部品」は、導線の端部において他の通電部材との間に電気的接続をとるための金具であり、例えば銅合金にＳｎめっきしたものが代表的である。 The “terminal component” is a metal fitting for establishing an electrical connection with another current-carrying member at the end of the conducting wire, and is typically a copper alloy plated with Sn.
図１に、ワイヤーハーネス先端における端子部品と導線の締結形態の一例を模式的に示す。導線は複数本（例えば５〜１２本）の素線により構成され、導線の先端部で絶縁被覆から露出した素線の束は、かしめ加工によって端子部品に圧着接合され、圧着部において圧着バレルが形成される。導線の絶縁被覆の部分も端子部品に軽く固定される。 In FIG. 1, an example of the fastening form of the terminal component and conducting wire in a wire harness front-end | tip is shown typically. The conducting wire is composed of a plurality of strands (for example, 5 to 12 strands), and the bundle of strands exposed from the insulation coating at the leading end of the conducting wire is crimped and joined to the terminal component by caulking, and a crimping barrel is formed at the crimping portion. It is formed. The insulating coating portion of the conductor is also lightly fixed to the terminal component.
図２に、圧着部引張強さ測定試料の形態を模式的に例示する。端子部品に複数本の素線の束がかしめ加工により圧着接合され、圧着部が形成されている。実際のワイヤーハーネスでは絶縁被覆の部分も軽く固定されているが、圧着部引張強さ測定試料では絶縁被覆のない裸の素線束が圧着部で固定されており、絶縁被覆固定用の爪による拘束を受けない状態となっている。ワイヤーハーネスから採取したサンプルを測定する場合は、絶縁被覆固定用の爪を機械的に開いて、その部分での拘束を解くとともに、絶縁被覆を除去することによって圧着部引張強さ測定試料を作製することができる。 In FIG. 2, the form of the crimping | compression-bonding part tensile strength measurement sample is illustrated typically. A bundle of a plurality of strands is crimped and joined to the terminal component by caulking to form a crimped portion. In an actual wire harness, the insulation coating part is also lightly fixed, but in the crimped part tensile strength measurement sample, a bare wire bundle without insulation coating is fixed at the crimping part, and restrained by the nail for fixing the insulation coating. It is in a state not to receive. When measuring a sample collected from a wire harness, mechanically open the nail for fixing the insulation coating, release the restraint at that part, and remove the insulation coating to produce a specimen for measuring the tensile strength of the crimped part can do.
圧着部引張強さσAの測定では、試料を構成する端子部品の圧着部より先端側の部位を引張試験機の一方のチャックに固定するとともに、圧着接合された素線束のうち１本の素線を引張試験機の他方のチャックに緩衝材を介して固定する。この状態で引張試験を行い、その引張強さの値をその素線の圧着部引張強さσA（Ｎ／ｍｍ2）とする。素線は通常、圧着部の固定端部近傍（図２中、※印付きの矢印で表示）で破断するか、あるいは破断前に圧着部から抜けてしまう（線抜け）。このような引張試験を、その圧着部引張強さ測定試料の全ての個々の素線について順次実施することによって、圧着部を構成する個々の素線がすべて、圧着部引張強さσAが２００Ｎ／ｍｍ2以上で当該圧着部に固定されているか否かを評価することができる。 In the measurement of the tensile strength σ A of the crimping part, the portion on the tip side of the crimping part of the terminal component constituting the sample is fixed to one chuck of the tensile tester, and one of the strands of the crimp-bonded strands. The wire is fixed to the other chuck of the tensile tester via a cushioning material. A tensile test is performed in this state, and the value of the tensile strength is defined as the crimped portion tensile strength σ A (N / mm 2 ) of the element wire. The element wire usually breaks near the fixed end of the crimping part (indicated by an arrow with * in FIG. 2) or comes out of the crimping part before breaking (line missing). By carrying out such a tensile test sequentially for all the individual wires of the crimped portion tensile strength measurement sample, all the individual wires constituting the crimped portion have a crimped portion tensile strength σ A of 200 N. It can be evaluated whether it is fixed to the said crimping | compression-bonding part by / mm < 2 > or more.
本発明に用いるＡｌめっき鋼線は、これを素線として複数本束ねた状態で端子部品に圧着接合したとき、その圧着部の固定端部近傍における素線の破断強度（圧着部引張強さσA）が、従来のＣｕ素線と同等以上に高く、耐久性に優れたワイヤーハーネスが構築できる。その耐久性はＡｌ素線を用いた場合よりも極めて安定しており、素線を細径化した場合においてもワイヤーハーネスの信頼性向上を図ることができる。また、かしめ加工での圧着負荷が変動した場合の圧着部引張強さσAも比較的安定しており、かしめ加工条件の許容範囲は十分に実用的である。さらに、上記Ａｌめっき鋼線を用いたワイヤーハーネスは、Ｃｕ素線を用いたものとは異なり、鉄スクラップともに溶解可能であるからリサイクル性にも優れる。 When the Al-plated steel wire used in the present invention is crimp-bonded to a terminal component in a state where a plurality of the Al-plated steel wires are bundled as a strand, the breaking strength of the strand near the fixed end of the crimped portion (crimped portion tensile strength σ A ) is higher than or equal to the conventional Cu strand, and a wire harness excellent in durability can be constructed. The durability is extremely stable as compared with the case where an Al strand is used, and the reliability of the wire harness can be improved even when the strand is thinned. Further, the tensile strength σ A of the crimped part when the crimping load in the caulking process varies is relatively stable, and the allowable range of the caulking process conditions is sufficiently practical. Furthermore, the Al-plated steel wire a wire harness used is different from that using the Cu wire, excellent in recyclability because it is soluble in both the iron scrap.
本発明に用いるＡｌめっき鋼線は、鋼芯線の周囲にＡｌめっき被覆を有する直径（円相当径）Ｄが０.１〜０.６ｍｍのものである。Ｄは０.１５〜０.４ｍｍであることがより好ましい。Ａｌめっき鋼線の直径Ｄが小さすぎるとワイヤーハーネスとして使用した場合の耐久性を十分に確保することが難しくなる。すなわち、たとえ単位断面積あたりの引張強さσ1あるいは圧着部引張強さσAが高くても、個々の素線が破断にいたる引張荷重は小さいものとなり、ワイヤーハーネス取扱い時に断線を起こしやすくなる。一方、Ａｌめっき鋼線の直径Ｄがあまり大きいとワイヤーハーネスのコンパクト化にとって不利となる。 The Al plated steel wire used in the present invention has a diameter (equivalent circle diameter) D of 0.1 to 0.6 mm having an Al plating coating around the steel core wire. It is more preferable that D is 0.15 to 0.4 mm. If the diameter D of the Al-plated steel wire is too small, it is difficult to ensure sufficient durability when used as a wire harness. In other words, even if the tensile strength σ 1 per unit cross-sectional area or the crimped portion tensile strength σ A is high, the tensile load that causes each individual wire to break is small, and breakage is likely to occur when handling the wire harness. . On the other hand, if the diameter D of the Al-plated steel wire is too large, it is disadvantageous for making the wire harness compact.
本発明に用いるＡｌめっき鋼線は下記（１）の要件を満たすものである。
（１）当該Ａｌめっき鋼線（直径＝Ｄ）の単位長さあたりの常温での電気抵抗をρ1（Ω／ｍ）、直径（円相当径）がＤであるＣｕ線の単位長さあたりの常温での電気抵抗をρCu（Ω／ｍ）と表すとき、ρ1／ρCu≦６が成立すること。
ただし、ρCuは、焼鈍標準軟銅（ＩＡＣＳ）からなる直径＝ＤのＣｕ線を想定し、その常温での体積抵抗率を１.７２μΩ・ｃｍとして、当該Ｃｕ線の単位長さあたりの電気抵抗を算出することによって求めることができる。
The Al-plated steel wire used in the present invention satisfies the following requirement (1).
(1) Per unit length of Cu wire having a ρ 1 (Ω / m) electrical resistance at room temperature per unit length of the Al-plated steel wire (diameter = D) and a diameter (equivalent circle diameter) of D When the electrical resistance at room temperature is expressed as ρ Cu (Ω / m), ρ 1 / ρ Cu ≦ 6 must be established.
However, ρ Cu is an annealed standard annealed copper (IACS) diameter = D Cu wire, assuming that the volume resistivity at room temperature is 1.72 μΩ · cm, electrical resistance per unit length of the Cu wire Can be obtained by calculating.
発明者らの検討によれば、ワイヤーハーネスの導線としては、Ｃｕ線に対して１／６程度の導電性を有していれば使用可能である。つまり、導線の電気抵抗はＣｕ線の６倍程度までは許容できる。そこで、本発明ではρ1／ρCu≦６であることを要件とする。ρ1／ρCu≦５であることがより好ましく、ρ1／ρCu≦４であることが一層好ましい。 According to the study by the inventors, the wire harness can be used as long as it has a conductivity of about 1/6 with respect to the Cu wire. That is, the electrical resistance of the conducting wire can be allowed up to about 6 times that of the Cu wire. Therefore, in the present invention, it is a requirement that ρ 1 / ρ Cu ≦ 6. more preferably ρ 1 / ρ Cu ≦ 5, and still more preferably ρ 1 / ρ Cu ≦ 4.
鋼芯線の材質が同じであれば、長手方向に垂直な断面における鋼芯線の面積率が小さいほど、ρ1／ρCuの値も小さくなる。すなわちρ1／ρCu値はＡｌめっき付着量によってコントロールすることが可能である。 If the material of the steel core wire is the same, the smaller the area ratio of the steel core wire in the cross section perpendicular to the longitudinal direction, the smaller the value of ρ 1 / ρ Cu . That is, the ρ 1 / ρ Cu value can be controlled by the amount of Al plating adhesion.
さらに本発明に用いるＡｌめっき鋼線は下記（２）の要件を満たすものである。
（２）引張強さσ1が２５０Ｎ／ｍｍ2以上であること。
Furthermore , the Al-plated steel wire used in the present invention satisfies the following requirement (2).
(2) Tensile strength σ 1 is 250 N / mm 2 or more.
この引張強さσ1は、所定長さのＡｌめっき鋼線を、緩衝材を介して引張試験機のチャックに固定して引張試験を行い、チャック間の中間部で破断させた場合の引張強さである。引張強さσ1が安定して２５０Ｎ／ｍｍ2以上の値を示す材料でないと、これを束ねて端子部品に圧着接合した圧着部の固定端部近傍における最も破断しやすい箇所での耐久性が不十分となる場合がある。引張強さσ1は２８０Ｎ／ｍｍ2以上であることがより好ましく、３００Ｎ／ｍｍ2以上であることが一層好ましい。 This tensile strength σ 1 is the tensile strength when an Al-plated steel wire of a predetermined length is fixed to a chuck of a tensile tester via a cushioning material, and a tensile test is performed and the intermediate portion between the chucks is broken. That's it. If the tensile strength σ 1 is not a material that stably shows a value of 250 N / mm 2 or more, the durability at the most prone to breakage in the vicinity of the fixed end of the crimped portion that is bundled and crimped to the terminal component It may be insufficient. More preferably the tensile strength sigma 1 is 280N / mm 2 or more, and more preferably 300N / mm 2 or more.
鋼芯線の材質が同じであれば、長手方向に垂直な断面における鋼芯線の面積率が大きいほど、Ａｌめっき鋼線の引張強さσ1は大きくなる。すなわち引張強さσ1はＡｌめっき付着量によってコントロールすることが可能である。 If the material of the steel core wire is the same, the tensile strength σ 1 of the Al-plated steel wire increases as the area ratio of the steel core wire in the cross section perpendicular to the longitudinal direction increases. That is, the tensile strength σ 1 can be controlled by the amount of Al plating adhesion.
本発明に用いるＡｌめっき鋼線はさらに下記（３）の要件を満たすものである。
（３）長手方向に垂直な断面において、断面全体に占める鋼芯線の面積率が６０％未満であること。
Al-plated steel wire for use in the present invention is Ru der to further meet the following requirements (3).
(3) In the cross section perpendicular to the longitudinal direction, the area ratio of the steel core wire in the entire cross section is less than 60%.
Ａｌめっき鋼線の長手方向に垂直な断面における鋼芯線の面積率が大きくなること、すなわち換言すれば、同断面において鋼芯線以外の部分（Ａｌめっき層や、鋼芯線／Ａｌめっき層界面に介在するＦｅ−Ａｌ系合金層など）の面積率が小さくなることは、Ａｌめっき鋼線の引張強さσ1を増大させるためには有利に働く。その一方で、Ａｌめっき層の面積率低減により電気抵抗ρ1が低下する要因となる。これらの点に関しては上述した。 The area ratio of the steel core wire in the cross section perpendicular to the longitudinal direction of the Al-plated steel wire is increased. In other words, in the same cross-section, the portion other than the steel core wire (Al plating layer or intervening at the steel core wire / Al plating layer interface) Reducing the area ratio of the Fe—Al-based alloy layer, etc.) is advantageous for increasing the tensile strength σ 1 of the Al-plated steel wire. On the other hand, the electrical resistance ρ 1 decreases due to the reduction in the area ratio of the Al plating layer. These points have been described above.
ところが、鋼芯線の表面を覆うＡｌめっき被覆は、端子部品との圧着部において、空隙の少ない圧着接合構造を形成するうえで極めて有効に作用することが新たに明らかとなった。すなわち、Ａｌめっき鋼線を複数本束ねて端子部品にかしめ加工により圧着接合した際、圧着部において、硬質の鋼芯線はほとんど変形しない一方、軟質のＡｌめっき被覆層の部分が潰されて大きく変形し、圧着部のバレル内で鋼芯線の存在領域の残部をＡｌめっき被覆層由来のＡｌ系相がほぼ埋めつくす圧着接合構造が形成される。Ａｌめっき被覆層が優先的に変形することにより、鋼芯線自体については当該圧着部のバレル内と、その近傍のバレル外とで断面形状や径（断面積）には大きな変化が生じないと考えられる。
ここで、「バレル」とは、圧着部において、かしめ加工により塑性変形して素線束を囲むように把持している金具の部分である。
However, it has been newly clarified that the Al plating coating covering the surface of the steel core wire works extremely effectively in forming a crimped joint structure with few voids in the crimped portion with the terminal component. In other words, when a plurality of Al-plated steel wires are bundled and crimped to terminal parts by crimping, the hard steel core wire is hardly deformed in the crimped part, while the soft Al-plated coating layer is crushed and deformed greatly. Thus, a pressure bonding structure is formed in which the Al-based phase derived from the Al plating coating layer substantially fills the remainder of the region where the steel core wire exists in the barrel of the pressure bonding portion. By preferentially deforming the Al plating coating layer, the steel core wire itself is considered to have no significant change in the cross-sectional shape and diameter (cross-sectional area) between the inside of the barrel of the crimping part and the outside of the barrel in the vicinity thereof. It is done.
Here, the “barrel” is a portion of a metal fitting that is plastically deformed by caulking in a crimping portion and is gripped so as to surround the wire bundle.
このように、上記のＡｌめっき鋼線を素線に使用すると、
（i）バレル内の空隙が少ないこと、
（ii）鋼芯線の断面形状および径はバレル内とその近傍のバレル外とで大きな変化を生じないこと、
を特徴とする圧着部が形成される。上記（i）（ii）の特徴点がもたらす相乗作用によって、後述の圧着部引張強さσAが高く、耐久性に優れた圧着接合が可能になるものと考えられる。
Thus, when the above Al-plated steel wire is used for the strand,
(I) There are few gaps in the barrel,
(Ii) The cross-sectional shape and diameter of the steel core wire should not change significantly between the inside of the barrel and the outside of the barrel in the vicinity thereof,
Is formed. The synergistic effect brought about by the above features (i) and (ii) is considered to enable the press-bonding joint having a high press-bonding portion tensile strength σ A described later and excellent in durability.
種々検討の結果、このような相乗効果を十分に発揮させるうえで、本発明に用いるＡｌめっき鋼線は上記（３）の要件を満たすこと、すなわち、長手方向に垂直な断面において、断面全体に占める鋼芯線の面積率が６０％未満であることが、より効果的である。５０％以下であることがさらに効果的であり、４０％以下であることがさらに一層効果的である。ただし、その下限については上記（２）の要件により制限を受けるので、特に設定する必要はない。 As a result of various studies, in order to sufficiently exhibit such a synergistic effect, the Al-plated steel wire used in the present invention satisfies the requirement of the above (3), that is, in the cross section perpendicular to the longitudinal direction, the entire cross section. It is more effective that the area ratio of the steel core wire to occupy is less than 60%. It is more effective that it is 50% or less, and it is still more effective that it is 40% or less. However, the lower limit is not particularly set because it is restricted by the requirement (2).
芯線となる鋼線については、例えばＪＩＳ Ｇ３５０５に規定される軟鋼線材、Ｇ３５３２に規定される鉄線、Ｇ３５０６に規定される硬鋼線材などが適用可能である。 For the steel wire to be the core wire, for example, a mild steel wire specified in JIS G3505, an iron wire specified in G3532, a hard steel wire specified in G3506, and the like are applicable.
本発明に用いるＡｌめっき鋼線は、このような鋼芯線に、溶融Ａｌめっきを施すことにより得ることができる。その際、上記（１）（２）の要件、あるいはさらに（３）の要件を満たすに足る量の溶融めっき層を付着させるようにめっき条件をコントロールする。 The Al-plated steel wire used in the present invention can be obtained by subjecting such a steel core wire to hot-dip Al plating. At that time, the plating conditions are controlled so that an amount of the hot-dip plating layer sufficient to satisfy the requirements (1) and (2) or (3) is adhered.
本明細書でいう「Ａｌめっき」としては、Ｓｉ含有量０（無添加）〜１５質量％のＡｌめっきが対象となる。Ｓｉ以外には３質量％以下の範囲でＦｅの含有が許容される。溶融Ａｌめっき浴にＳｉを添加するとめっき浴の融点が低下するので、めっき浴温を低くすることができる点で有利となる。Ａｌめっき浴にＳｉを添加する場合は、通常、Ｓｉ含有量１５質量％以下の範囲で行われる。ただし、Ａｌめっき被覆中におけるＳｉは、めっき被覆層の加工性を低下させる要因となる。また、導電性低下にも繋がる。このため、溶融めっき浴中のＳｉ含有量は９質量％以下であることが望ましく、６質量％以下であることがより望ましい。 As the “Al plating” in this specification, Al plating with an Si content of 0 (no addition) to 15% by mass is targeted. In addition to Si, the Fe content is allowed in the range of 3% by mass or less. When Si is added to the molten Al plating bath, the melting point of the plating bath is lowered, which is advantageous in that the temperature of the plating bath can be lowered. When adding Si to the Al plating bath, the Si content is usually within a range of 15% by mass or less. However, Si in the Al plating coating becomes a factor of reducing the workability of the plating coating layer. Moreover, it leads also to electroconductivity fall. Therefore, the Si content in the hot dipping bath is desirably 9% by mass or less, and more desirably 6% by mass or less.
上記のＡｌめっき鋼線からなる素線を複数本束ねた状態で端子部品に圧着にて固定してなる圧着接合構造においては、一般的なかしめ加工度の範囲において、上記複数本の個々の素線がすべて、圧着部引張強さσA；２００Ｎ／ｍｍ2以上、あるいはさらに２５０Ｎ／ｍｍ2以上で端子部品に固定されている状態を実現させることができる。個々の素線がすべて、２００Ｎ／ｍｍ2以上という高い圧着部引張強さσAで固定されている圧着接合構造は、従来のＣｕ素線を用いたものと同等以上の高い耐久性を呈するものである。 In a crimped joint structure in which a plurality of strands made of the Al-plated steel wire are bundled and fixed to a terminal component by crimping, the plurality of individual strands are within the range of general caulking. It is possible to realize a state in which all the wires are fixed to the terminal component at a crimping portion tensile strength σ A of 200 N / mm 2 or more, or even 250 N / mm 2 or more. The crimped joint structure in which all the individual wires are fixed at a high crimping portion tensile strength σ A of 200 N / mm 2 or more exhibits high durability equal to or higher than that using conventional Cu wires. It is.
《実施例１（Ａｌめっき鋼線）》
直径０.２ｍｍの鋼線（Ｃ：０.２７質量％）を用意し、これに実験室の溶融Ａｌめっき装置を用いて溶融Ａｌめっきを施した。溶融Ａｌめっきの前処理としてガス還元を行った。ガス還元条件は、ガス組成：５０体積％Ｈ2−Ｎ2、露点：−４０℃、温度：７５０℃、処理時間：１０秒である。Ａｌめっき浴は、組成：Ａｌ−２.２質量％Ｆｅ、温度：６８０℃とした。この浴中にガス還元を終えた鋼線を１秒浸漬したのち、垂直に引き上げる方法で溶融Ａｌめっきを施した。めっき付着量は気体絞り法により調整した。めっき後の線径は平均０.３５ｍｍであった。この線材をダイスで伸線加工することにより、線径０.３２ｍｍのＡｌめっき鋼線（本発明相当品）を得た。
<< Example 1 (Al-plated steel wire) >>
A steel wire having a diameter of 0.2 mm (C: 0.27% by mass) was prepared, and this was subjected to molten Al plating using a laboratory molten Al plating apparatus. Gas reduction was performed as a pretreatment for hot-dip Al plating. The gas reduction conditions are gas composition: 50% by volume H 2 —N 2 , dew point: −40 ° C., temperature: 750 ° C., and processing time: 10 seconds. The Al plating bath had a composition: Al-2.2% by mass Fe, and a temperature: 680 ° C. The steel wire after gas reduction was immersed in this bath for 1 second, and then hot-dip Al plating was performed by pulling it up vertically. The amount of plating adhesion was adjusted by the gas squeezing method. The average wire diameter after plating was 0.35 mm. This wire was drawn with a die to obtain an Al-plated steel wire (equivalent to the present invention) having a wire diameter of 0.32 mm.
この伸線加工後のＡｌめっき鋼線について、溶融法により単位長さあたりのＡｌめっき被覆の付着量を求めたところ、０.１５ｇ／ｍであった。また、長手方向に垂直な断面を光学顕微鏡で観察し、その画像から当該断面に占める鋼芯線の面積率を求めたところ、３２％であった。また、このＡｌめっき鋼線の円相当径Ｄは０.３２ｍｍであった。 With respect to the Al-plated steel wire after wire drawing, the amount of the Al-plated coating per unit length obtained by the melting method was 0.15 g / m. Moreover, the cross section perpendicular | vertical to a longitudinal direction was observed with the optical microscope, and it was 32% when the area ratio of the steel core wire which occupies for the said cross section was calculated | required from the image. Moreover, the circle equivalent diameter D of this Al plated steel wire was 0.32 mm.
Ｄ＝０.３２ｍｍの上記Ａｌめっき鋼線について、４端子法による電気抵抗測定結果から常温での単位長さあたりの電気抵抗ρ1を求めたところ、０.６６Ω／ｍであった。一方、Ｄ＝０.３２ｍｍのＣｕ線を想定して、体積抵抗率１.７２μΩ・ｃｍを用いて単位長さあたりの当該Ｃｕ線の電気抵抗ρCuを算出したところ、０.２１Ω／ｍであった。したがって、ρ1／ρCuの値は３.１となる。 With respect to the above Al-plated steel wire with D = 0.32 mm, the electrical resistance ρ 1 per unit length at room temperature was determined from the electrical resistance measurement result by the 4-terminal method, and found to be 0.66 Ω / m. On the other hand, assuming a Cu wire of D = 0.32 mm, the electrical resistance ρ Cu of the Cu wire per unit length was calculated using a volume resistivity of 1.72 μΩ · cm. there were. Therefore, the value of ρ 1 / ρ Cu is 3.1.
また、Ｄ＝０.３２ｍｍの上記Ａｌめっき鋼線について、常温での引張強さを求めた。チャック間距離が概ね１００ｍｍとなるように、緩衝材（厚紙）を介してＡｌめっき鋼線を引張試験機のチャックに取り付け、引張速度１０ｍｍ／ｍｉｎにて破断するまで引張試験を行った。試験数ｎ＝１０で行ったところ、いずれもチャック間の中間部（ほぼ中央位置）で破断した。ｎ＝１０での引張強さの平均値を求め、これを当該Ａｌめっき鋼線の引張強さσ1とした。引張強さσ1は３６６Ｎ／ｍｍ2と求まった。 Moreover, the tensile strength at normal temperature was calculated | required about the said Al plating steel wire of D = 0.32mm. An Al-plated steel wire was attached to a chuck of a tensile tester via a cushioning material (thick paper) so that the distance between chucks was approximately 100 mm, and a tensile test was performed until it broke at a tensile speed of 10 mm / min. When the number of tests was n = 10, all fractured at an intermediate portion (almost central position) between chucks. The average value of tensile strength at n = 10 was determined, and this was taken as the tensile strength σ 1 of the Al-plated steel wire. The tensile strength σ 1 was determined to be 366 N / mm 2 .
次に、Ｄ＝０.３２ｍｍの上記Ａｌめっき鋼線を素線として、これを７本束ねた状態で、図３に示す寸法形状の端子部品にかしめ加工により圧着接合することにより、図２に示したような形態の圧着部引張強さ測定試料を作製した。かしめ加工の加工度（付与する圧着負荷の程度）については、一般に圧着後のクリンプハイト（圧着部高さ）によって管理され、導体断面積（各素線の断面積の総和）に応じて、その端子部品における標準的なクリンプハイトの範囲が定められている。ここでは、標準的なクリンプハイトのものから、加工度の低い（すなわちクリンプハイトが標準より大きい）ものまで、種々のクリンプハイトのものを試作した。 Next, the above Al-plated steel wire with D = 0.32 mm is used as an element wire, and seven of these are bundled, and then crimped and joined to a terminal part having the shape and shape shown in FIG. A specimen for measuring the tensile strength of the crimped part having the form as shown was produced. The degree of crimping (the degree of crimping load to be applied) is generally controlled by the crimp height (crimp height) after crimping, and depending on the conductor cross-sectional area (the sum of the cross-sectional areas of each strand), Standard crimp height ranges for terminal components are defined. Here, various types of crimp heights were manufactured from standard crimp heights to those with a low degree of processing (that is, the crimp height is larger than the standard).
得られた各圧着部引張強さ測定試料において、その圧着接合構造を構成している個々の素線について１本ずつ圧着部引張強さσAを測定した。すなわち、試料における端子部品の圧着部より先端側の部位を引張試験機の一方のチャックに固定するとともに、当該部品に圧着接合された素線束のうち１本の素線を引張試験機の他方のチャックに緩衝材（厚紙）を介して固定し、この状態で引張試験を行った。圧着部の固定端部（図２参照）から、素線を掴んだチャックまでの距離は約５０ｍｍ程度とした。 In each of the obtained crimped portion tensile strength measurement samples, the crimped portion tensile strength σ A was measured for each of the individual wires constituting the crimped joint structure. That is, a portion of the sample that is closer to the tip than the crimping portion of the terminal component is fixed to one chuck of the tensile tester, and one strand of the strand bundle crimped to the component is connected to the other of the tensile tester. The sample was fixed to the chuck via a buffer material (thick paper), and a tensile test was performed in this state. The distance from the fixed end of the crimping part (see FIG. 2) to the chuck that grabbed the wire was about 50 mm.
図４に、本発明で規定するＡｌめっき鋼線を使用した圧着接合構造のクリンプハイトと圧着部引張強さσAの関係を示す。図４中には各クリンプハイト毎に素線７本すべての測定結果をプロットしてある。「線抜け」と表示したプロットは、素線が破断前に圧着部から抜けてしまったものである（図５、図６において同じ）。 FIG. 4 shows the relationship between the crimp height and the crimped portion tensile strength σ A of the crimped joint structure using the Al-plated steel wire defined in the present invention. In FIG. 4, the measurement results of all seven strands are plotted for each crimp height. The plot indicated as “line omission” is one in which the strands have been removed from the crimping part before breaking (the same applies to FIGS. 5 and 6).
図８に、クリンプハイトの異なるいくつかの試料について、圧着部断面（圧着バレルの横断面）の光学顕微鏡写真を参考のために例示する（以下の各例において同じ）。Ａｌめっき鋼線の例では、バレル内部の濃い色に見える７個の略円形の部分が鋼芯線であり、その周囲の白っぽく見える部分がＡｌめっき被覆が加工により潰れてバレル内を充填しているＡｌめっき層である。 FIG. 8 illustrates, for reference, optical micrographs of the cross-section of the crimped part (cross section of the crimped barrel) for several samples having different crimp heights (the same applies in the following examples). In the example of the Al-plated steel wire, the seven substantially circular portions that appear dark inside the barrel are steel core wires, and the peripherally white-white portions are crushed by processing to fill the inside of the barrel. It is an Al plating layer.
《比較例１（Ｃｕ線）》
自動車用極薄肉低圧電線（ＡＶＳＳ）７本撚り、公称導体断面積０.５ｍｍ2のビニル被覆銅線を入手し、ビニル被覆を除去してＣｕ素線を取り出した。このＣｕ線の直径は、実測の結果０.３１ｍｍであった。
<< Comparative Example 1 (Cu wire) >>
A vinyl-coated copper wire having a nominal conductor cross-sectional area of 0.5 mm 2 was obtained by twisting seven ultra-thin low-voltage electric wires (AVSS) for automobiles, removing the vinyl coating, and taking out the Cu element wire. The diameter of this Cu wire was 0.31 mm as a result of actual measurement.
このＣｕ線を素線として７本束ねた状態で、実施例１と同様の端子部品に圧着接合することにより、圧着部引張強さ測定試料を作製した。ここでも種々のクリンプハイトのものを試作した。 In a state where seven Cu wires were bundled as element wires, a crimped portion tensile strength measurement sample was prepared by crimping and joining to the same terminal component as in Example 1. Again, various crimp heights were prototyped.
得られた各圧着部引張強さ測定試料において、実施例１と同様の方法で、その圧着接合構造を構成している個々の素線について１本ずつ圧着部引張強さσAを測定した。 In each of the obtained crimped portion tensile strength measurement samples, the crimped portion tensile strength σ A was measured one by one for each strand constituting the crimped joint structure in the same manner as in Example 1.
図５に、Ｃｕ線を使用した圧着接合構造のクリンプハイトと圧着部引張強さσAの関係を示す。図５中には各クリンプハイト毎に素線７本すべての測定結果をプロットしてある。 FIG. 5 shows the relationship between the crimp height of the crimped joint structure using Cu wire and the tensile strength σ A of the crimped part. In FIG. 5, the measurement results of all seven strands are plotted for each crimp height.
《比較例２（Ａｌ合金素線）》
Ａｌ合金線として、ＪＩＳに規定されるＡ５０５６に相当するＡｌ合金（Ａｌ−５％Ｍｇ）の線材を入手した。このＡｌ合金線の直径は、実測の結果０.３０ｍｍであった。
<< Comparative Example 2 (Al alloy strand) >>
As an Al alloy wire, an Al alloy (Al-5% Mg) wire corresponding to A5056 specified by JIS was obtained. The diameter of this Al alloy wire was 0.30 mm as a result of actual measurement.
このＡｌ合金線を素線として７本束ねた状態で、実施例１と同様の端子部品に圧着接合することにより、圧着部引張強さ測定試料を作製した。ここでも種々のクリンプハイトのものを試作した。 In a state where seven of the Al alloy wires were bundled as strands, a crimped portion tensile strength measurement sample was prepared by crimping and joining to the same terminal component as in Example 1. Again, various crimp heights were prototyped.
得られた各圧着部引張強さ測定試料において、実施例１と同様の方法で、その圧着接合構造を構成している個々の素線について１本ずつ圧着部引張強さσAを測定した。 In each of the obtained crimped portion tensile strength measurement samples, the crimped portion tensile strength σ A was measured one by one for each strand constituting the crimped joint structure in the same manner as in Example 1.
図６に、Ａｌ合金線を使用した圧着接合構造のクリンプハイトと圧着部引張強さσAの関係を示す。図６中には各クリンプハイト毎に素線７本すべての測定結果をプロットしてある。 FIG. 6 shows the relationship between the crimp height of the crimped joint structure using the Al alloy wire and the tensile strength σ A of the crimped part. In FIG. 6, the measurement results of all seven strands are plotted for each crimp height.
《各例の対比》
図７に、図４〜図６に示したデータのうち、各クリンプハイトでの圧着部引張強さが最も低い測定値をプロットしたグラフを示す。図７からわかるように、本発明で規定するＡｌめっき鋼線を使用した圧着接合構造では、広いクリンプハイトの範囲でＣｕ線を使用したものおよびＡｌ合金線を使用したものより高い圧着部引張強さσAが安定して得られた。
<Contrast of each example>
FIG. 7 shows a graph in which measured values having the lowest crimped portion tensile strength at each crimp height among the data shown in FIGS. 4 to 6 are plotted. As can be seen from FIG. 7, in the crimped joint structure using the Al-plated steel wire defined in the present invention , the tensile strength of the crimped part is higher than that using the Cu wire and the one using the Al alloy wire in a wide crimp height range. Σ A was obtained stably.
なお、Ａｌ合金線を使用した場合には、１つの圧着接合構造を構成する個々の素線における圧着部引張強さσAのバラツキが非常に大きい（図６）。したがって、Ａｌ合金線の場合は圧着部近傍における耐久性を十分に確保するためには、より線径の太い素線を使用する必要があり、ワイヤーハーネスの細線化のニーズには十分対応しきれない。 When an Al alloy wire is used, the variation in the crimped portion tensile strength σ A among individual wires constituting one crimp bonding structure is very large (FIG. 6). Therefore, in the case of Al alloy wire, in order to ensure sufficient durability in the vicinity of the crimping part, it is necessary to use a strand with a larger wire diameter, and it can fully meet the needs of wire harness thinning. Absent.
Claims (3)
（１）当該Ａｌめっき鋼線（直径＝Ｄ）の単位長さあたりの常温での電気抵抗をρ 1 （Ω／ｍ）、直径（円相当径）がＤであるＣｕ線の単位長さあたりの常温での電気抵抗をρ Cu （Ω／ｍ）と表すとき、ρ 1 ／ρ Cu ≦６が成立すること。
（２）引張強さσ 1 が２５０Ｎ／ｍｍ 2 以上であること。
（３）長手方向に垂直な断面において、断面全体に占める鋼芯線の面積率が６０％未満であること。 An element made of an Al-plated steel wire having an Al-plated coating around the steel core wire, a diameter (equivalent circle diameter) D of 0.1 to 0.6 mm, and satisfying the following conditions (1) to (3) line, a compression bonding structure formed by fixing at crimped to the terminal part of a plurality of lines bundled state, the individual strands of the plurality of all, the tensile bonding portion strength sigma a is 200 N / mm 2 or more Crimped joint structure that is fixed to the terminal parts.
(1) Per unit length of Cu wire having a ρ 1 (Ω / m) electrical resistance at room temperature per unit length of the Al-plated steel wire (diameter = D ) and a diameter (equivalent circle diameter) of D When the electrical resistance at room temperature is expressed as ρ Cu (Ω / m), ρ 1 / ρ Cu ≦ 6 must be established.
(2) Tensile strength σ 1 is 250 N / mm 2 or more.
(3) In the cross section perpendicular to the longitudinal direction, the area ratio of the steel core wire in the entire cross section is less than 60%.
（１）当該Ａｌめっき鋼線（直径＝Ｄ）の単位長さあたりの常温での電気抵抗をρ 1 （Ω／ｍ）、直径（円相当径）がＤであるＣｕ線の単位長さあたりの常温での電気抵抗をρ Cu （Ω／ｍ）と表すとき、ρ 1 ／ρ Cu ≦６が成立すること。
（２）引張強さσ 1 が２５０Ｎ／ｍｍ 2 以上であること。
（３）長手方向に垂直な断面において、断面全体に占める鋼芯線の面積率が６０％未満であること。 An element made of an Al-plated steel wire having an Al-plated coating around the steel core wire, a diameter (equivalent circle diameter) D of 0.1 to 0.6 mm, and satisfying the following conditions (1) to (3) It is a crimped joint structure in which a plurality of wires are bundled and fixed to a terminal component by crimping. In the interior of the metal fitting that holds the wire bundle around the crimping part, it has priority over the steel core wire. The Al phase derived from the deformed and crushed Al plating coating fills the remainder of the region where each steel core wire exists, and all of the plurality of individual strands have a crimped portion tensile strength σ A of 200 N / mm 2 or more. Crimped joint structure that is fixed to the terminal parts.
(1) Per unit length of Cu wire having a ρ 1 (Ω / m) electrical resistance at room temperature per unit length of the Al-plated steel wire (diameter = D ) and a diameter (equivalent circle diameter) of D When the electrical resistance at room temperature is expressed as ρ Cu (Ω / m), ρ 1 / ρ Cu ≦ 6 must be established.
(2) Tensile strength σ 1 is 250 N / mm 2 or more.
(3) In the cross section perpendicular to the longitudinal direction, the area ratio of the steel core wire in the entire cross section is less than 60%.
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| JP5641756B2 (en) * | 2010-03-30 | 2014-12-17 | 日新製鋼株式会社 | Production method of Al plated steel wire |
| JP2012190615A (en) * | 2011-03-09 | 2012-10-04 | Nisshin Steel Co Ltd | Aluminum coated thin steel wire for heat-resistant electric wire |
| JP6198220B2 (en) * | 2013-03-22 | 2017-09-20 | 日新製鋼株式会社 | Hot-dip Al-plated steel wire, stranded wire and method for producing the same |
| EP3165628A4 (en) * | 2014-07-03 | 2017-11-22 | Nisshin Steel Co., Ltd. | MOLTEN Al PLATED STEEL WIRE AS WELL AS STRANDED WIRE AND MANUFACTURING METHOD THEREFOR |
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| JPH03219025A (en) * | 1990-01-24 | 1991-09-26 | Nippon Steel Corp | Production of aluminized steel wire having high strength and high toughness |
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