JP2016035872A - Method of manufacturing electrical wire with terminal - Google Patents

Method of manufacturing electrical wire with terminal Download PDF

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JP2016035872A
JP2016035872A JP2014158903A JP2014158903A JP2016035872A JP 2016035872 A JP2016035872 A JP 2016035872A JP 2014158903 A JP2014158903 A JP 2014158903A JP 2014158903 A JP2014158903 A JP 2014158903A JP 2016035872 A JP2016035872 A JP 2016035872A
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terminal
electric wire
wire
cylindrical portion
coating layer
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JP6585884B2 (en
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照沼　一郎
Ichiro Terunuma
一郎 照沼
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Fujikura Ltd
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  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Non-Insulated Conductors (AREA)
  • Insulated Conductors (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing an electrical wire with a terminal that is excellent in connection reliability.SOLUTION: A method of manufacturing an electrical wire 1 with a terminal that has an electrical wire 10 having a twisted wire 11 constructed by plural element wires 12, and a terminal 20 having a cylindrical portion 30 fixed to the electrical wire 10 at one end of the terminal 20 comprises a first step S20 for inserting an end portion of the twisted wire 11 to the cylindrical portion, a second step S30 for pinching the cylindrical portion 30 by a pair of electrodes 51, 52, and a third step S40 for applying voltages to the electrodes 51, 52. Each of the element wires 12 has a tin coated layer 123 formed of material containing tin as a main component. The cylindrical portion 30 has a tin plated layer 22 formed of material containing tin as a main component on at least the inner wall surface.SELECTED DRAWING: Figure 5

Description

本発明は、端子付き電線の製造方法に関するものである。   The present invention relates to a method for manufacturing a terminal-attached electric wire.

電線を端子に接続する方法として、筒状の電線接続部内に半田を充填し、当該半田に電線の芯線を完全に埋設すると共に、当該芯線に連続する絶縁被覆層を有する電線の端部も半田に埋設する方法が知られている（例えば特許文献１参照）。   As a method of connecting an electric wire to a terminal, a cylindrical electric wire connecting portion is filled with solder, and the core wire of the electric wire is completely embedded in the solder, and the end portion of the electric wire having an insulation coating layer continuous with the core wire is also soldered. There is known a method of embedding it in (see, for example, Patent Document 1).

特開２００４−７１４３７号公報JP 2004-71437 A

上記の方法により製造された端子付き電線では、半田を芯線内に十分に行き渡らせることができず、機械的強度や電気的性能が不安定となるおそれがあり、接続信頼性に劣るという問題がある。   In the electric wire with a terminal manufactured by the above method, the solder cannot be sufficiently distributed in the core wire, the mechanical strength and the electrical performance may be unstable, and the connection reliability is inferior. is there.

本発明が解決しようとする課題は、接続信頼性に優れた端子付き電線の製造方法を提供することである。   The problem to be solved by the present invention is to provide a method of manufacturing an electric wire with a terminal excellent in connection reliability.

［１］本発明に係る端子付き電線の製造方法は、少なくとも一つの導体を有する電線と、前記電線が固着された筒状部を一端に有する端子と、を備えた端子付き電線の製造方法であって、前記導体の端部を前記筒状部に挿入する第１の工程と、前記筒状部を一対の電極で挟む第２の工程と、前記電極に電圧を印加する第３の工程と、を備えており、前記導体は、錫を主成分とする材料からなる第１の錫被覆層を有し、前記筒状部も、錫を主成分とする材料からなる第２の錫被覆層を少なくとも内壁面に有することを特徴とする。   [1] A method for manufacturing a terminal-attached electric wire according to the present invention is a method for manufacturing a terminal-attached electric wire comprising: an electric wire having at least one conductor; and a terminal having a cylindrical portion to which the electric wire is fixed at one end. A first step of inserting the end portion of the conductor into the cylindrical portion, a second step of sandwiching the cylindrical portion between a pair of electrodes, and a third step of applying a voltage to the electrodes, And the conductor has a first tin coating layer made of a material containing tin as a main component, and the cylindrical portion also has a second tin coating layer made of a material containing tin as a main component. At least on the inner wall surface.

［２］上記発明において、前前記端子は、他端に板状の接続部を有しており、前記第３の工程は、前記接続部を冷却しながら、前記電極に電圧を印加することを含んでもよい。   [2] In the above invention, the front terminal has a plate-like connecting portion at the other end, and the third step is to apply a voltage to the electrode while cooling the connecting portion. May be included.

［３］上記発明において、前記筒状部は、一対の凹部を外周面に有しており、前記第２の工程は、前記電極を前記凹部に当接させることを含んでもよい。   [3] In the above invention, the cylindrical portion may have a pair of recesses on an outer peripheral surface, and the second step may include bringing the electrode into contact with the recess.

［４］上記発明において、前記導体は、アルミニウム線と、前記アルミニウム線を被覆する銅被覆層と、前記銅被覆層をさらに被覆する前記第１の錫被覆層と、を備えてもよい。   [4] In the above invention, the conductor may include an aluminum wire, a copper coating layer that covers the aluminum wire, and the first tin coating layer that further covers the copper coating layer.

本発明では、第１の錫被覆層を有する導体を、第２の錫被覆層を有する筒状部に挿入した状態で、当該筒状部を一対の電極で挟み、電極に電圧を印加する。このため、第１及び第２の錫被覆層を溶融させた後に凝固させることで、電線と端子を強固に接続することができ、優れた接続信頼性を確保することができる。   In the present invention, with the conductor having the first tin coating layer inserted into the cylindrical portion having the second tin coating layer, the cylindrical portion is sandwiched between the pair of electrodes, and a voltage is applied to the electrodes. For this reason, an electric wire and a terminal can be firmly connected by making it solidify after melting the 1st and 2nd tin coating layers, and the outstanding connection reliability can be secured.

図１は、本発明の実施形態における電線を示す断面図である。FIG. 1 is a cross-sectional view showing an electric wire in an embodiment of the present invention. 図２は、本発明の実施形態における端子を示す斜視図である。FIG. 2 is a perspective view showing a terminal in the embodiment of the present invention. 図３は、図１のIII-III線に沿った断面図である。3 is a cross-sectional view taken along line III-III in FIG. 図４は、本発明の他の実施形態における端子を示す斜視図である。FIG. 4 is a perspective view showing a terminal in another embodiment of the present invention. 図５は、本発明の実施形態における端子付き電線の製造方法を示す工程図である。Drawing 5 is a flowchart showing the manufacturing method of the electric wire with a terminal in the embodiment of the present invention. 図６（ａ）〜図６（ｄ）は、図５の各ステップを示す断面図である。6A to 6D are cross-sectional views showing the steps in FIG. 図７は、本発明の他の実施形態における挟持工程を示す断面図である。FIG. 7 is a cross-sectional view showing a clamping step in another embodiment of the present invention.

以下、本発明の実施形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

先ず、本発明の実施形態における電線の構造について、図１を参照しながら説明する。図１は本実施形態における電線の断面図である。   First, the structure of the electric wire in the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of an electric wire in the present embodiment.

本実施形態における電線１０は、図１に示すように、複数（本例では１０本）の素線１２を撚り合わせて構成された撚線１１と、当該撚線１１の外周を被覆する絶縁層１３と、を備えている。なお、撚線１１を構成する素線１２の本数は、特に上記の数に特に限定されない。   As shown in FIG. 1, the electric wire 10 in this embodiment includes a stranded wire 11 formed by twisting a plurality of (10 in this example) strands 12 and an insulating layer covering the outer periphery of the stranded wire 11. 13. In addition, the number of the strands 12 which comprise the twisted wire 11 is not specifically limited to said number in particular.

本実施形態における撚線１１の素線１２が、本発明における導体の一例に相当する。なお、撚線に代えて、電線が単線を有してもよい。この場合には、当該単線が、本発明における導体の一例に相当する。また、電線１０が絶縁層１３を備えていなくてもよい。   The strand 12 of the stranded wire 11 in the present embodiment corresponds to an example of a conductor in the present invention. In addition, it may replace with a twisted wire and an electric wire may have a single wire. In this case, the single wire corresponds to an example of a conductor in the present invention. Further, the electric wire 10 may not include the insulating layer 13.

それぞれの素線１２は、アルミニウム線１２１と、当該アルミニウム線１２１の外周を被覆する銅被覆層１２２と、当該銅被覆層１２２の外周をさらに被覆する錫被覆層１２３と、を有している。なお、本実施形態における錫被覆層１２３が、本発明における第１の錫被覆層の一例に相当する。   Each element wire 12 includes an aluminum wire 121, a copper coating layer 122 that covers the outer periphery of the aluminum wire 121, and a tin coating layer 123 that further covers the outer periphery of the copper coating layer 122. The tin coating layer 123 in this embodiment corresponds to an example of the first tin coating layer in the present invention.

アルミニウム線１２１は、例えば、アルミニウム、又は、アルミニウムを主成分とするアルミニウム合金から構成されている。銅被覆層１２３は、例えば、銅、又は、銅を主成分とする銅合金から構成されている。錫被覆層１２３は、錫を主成分とする材料から構成されており、具体的には、錫めっき層や半田めっき層等である。   The aluminum wire 121 is made of, for example, aluminum or an aluminum alloy containing aluminum as a main component. The copper coating layer 123 is made of, for example, copper or a copper alloy containing copper as a main component. The tin coating layer 123 is made of a material mainly composed of tin, and specifically, a tin plating layer, a solder plating layer, or the like.

アルミニウム線１２１と銅被覆層１２２から構成される銅被覆アルミニウム線（以下、単に「ＣＡ線」とも称する。）は、例えば、銅管の内孔にアルミニウム線１２１を挿入し伸線加工することで形成される。なお、アルミニウム線１２１の外周面に銅めっき処理を施すことで、ＣＡ線を形成してもよい。こうしたＣＡ線を用いることで、電線１０の軽量化を図ることができる。また、第１の錫被覆層１２３は、例えば、銅被覆層１２２の外周面に錫めっき処理を施すことで形成される。   A copper-coated aluminum wire (hereinafter also simply referred to as “CA wire”) composed of the aluminum wire 121 and the copper coating layer 122 is obtained by, for example, inserting the aluminum wire 121 into an inner hole of a copper tube and drawing it. It is formed. The CA wire may be formed by performing a copper plating process on the outer peripheral surface of the aluminum wire 121. By using such a CA wire, the weight of the electric wire 10 can be reduced. Moreover, the 1st tin coating layer 123 is formed by performing a tin plating process to the outer peripheral surface of the copper coating layer 122, for example.

絶縁層１３は、樹脂材料等の電気絶縁性を有する材料から構成されている。後述する図６（ａ）に示すように、電線１０の端部から所定の長さＬｏの絶縁層１３が剥かれており、当該電線１０の端部において撚線１１が露出している。この露出している撚線１１の端部が、後述する端子２０の筒状部３０に挿入され、抵抗溶接によって端子２０に接合される。 The insulating layer 13 is made of a material having electrical insulation properties such as a resin material. As shown in FIG. 6 (a) to be described later, the insulating layer 13 of a predetermined length L o from the end of the electric wire 10 have been peeled, twisted 11 at the end of the wire 10 is exposed. The exposed end portion of the stranded wire 11 is inserted into a cylindrical portion 30 of the terminal 20 described later, and is joined to the terminal 20 by resistance welding.

次に、本実施形態における端子の構造について、図２〜図３は参照しながら説明する。図２は本実施形態における端子を示す斜視図であり、図３は図２のIII-III線に沿った断面図である。   Next, the structure of the terminal in the present embodiment will be described with reference to FIGS. FIG. 2 is a perspective view showing a terminal in the present embodiment, and FIG. 3 is a cross-sectional view taken along line III-III in FIG.

本実施形態における端子２０は、図２及び図３に示すように、筒状部３０と接続部４０を備えている。また、この端子２０は、銅、又は、銅を主成分とした銅合金から構成される母材２１を有していると共に、その母材２１を被覆する錫めっき層２２をさらに有している。なお、本実施形態における錫めっき層２２が、本発明における第２の錫被覆層の一例に相当する。   The terminal 20 in this embodiment is provided with the cylindrical part 30 and the connection part 40, as shown in FIG.2 and FIG.3. The terminal 20 includes a base material 21 made of copper or a copper alloy containing copper as a main component, and further includes a tin plating layer 22 that covers the base material 21. . In addition, the tin plating layer 22 in this embodiment is equivalent to an example of the 2nd tin coating layer in this invention.

筒状部３０は、端子２０の一端に設けられており、有底の円筒形状を有している。この筒状部３０は、端子２０の一端側に向かって開口する挿入穴３１を有している。この挿入穴３１に電線１０の撚線１１が挿入された状態で、後述する抵抗溶接を行うことで、電線１０と端子２０が固着される。   The cylindrical portion 30 is provided at one end of the terminal 20 and has a bottomed cylindrical shape. The cylindrical portion 30 has an insertion hole 31 that opens toward one end of the terminal 20. In a state where the stranded wire 11 of the electric wire 10 is inserted into the insertion hole 31, the electric wire 10 and the terminal 20 are fixed by performing resistance welding described later.

こうしたクローズドバレル型の筒状部３０を用いることで、電線１０を筒状部３０で包むことができる。このため、たとえＣＡ線のアルミニウム線１２１が露出した場合であっても、ガルバニック腐食による接触不良の発生を抑制することができる。   By using such a closed barrel type tubular portion 30, the electric wire 10 can be wrapped with the tubular portion 30. For this reason, even if it is a case where the aluminum wire 121 of CA line | wire is exposed, generation | occurrence | production of the contact failure by galvanic corrosion can be suppressed.

なお、図２及び図３に示す例では、筒状部３０は、真円環状の断面形状を有しているが、特にこれに限定されない。例えば、筒状部３０の断面形状を、楕円、四角形、六角形等の環状としてもよい。   In the example shown in FIGS. 2 and 3, the cylindrical portion 30 has a perfect circular cross-sectional shape, but is not particularly limited thereto. For example, the cross-sectional shape of the cylindrical portion 30 may be an ellipse, a quadrangle, a hexagon, or the like.

接続部４０は、端子２０の他端に設けられており、一様の厚さを有する板状の部分を折り曲げることで形成された略Ｌ型形状を有している。この接続部４０は、第１の板状部４１と、折り曲げ部４２と、第２の板状部４３と、を有している。   The connection portion 40 is provided at the other end of the terminal 20 and has a substantially L-shape formed by bending a plate-like portion having a uniform thickness. The connection portion 40 includes a first plate-like portion 41, a bent portion 42, and a second plate-like portion 43.

第１の板状部４１は、筒状部３０の他端から当該筒状部３０の延在方向（図中のＸ方向）と実質的に同一の方向に沿って延在している。この第１の板状部４１の下面は、筒状部３０の最下端と実質的に同一直線上に位置している。また、第１の板状部４１は、筒状部３０に対して相対的に薄くなっている。このため、筒状部３０は、当該筒状部３０の他端に傾斜面３２を有しており、この傾斜面３２は、筒状部３０の一端に向かうに従って高くなるように傾斜している。   The first plate-like portion 41 extends from the other end of the tubular portion 30 along substantially the same direction as the extending direction of the tubular portion 30 (X direction in the drawing). The lower surface of the first plate-like portion 41 is located substantially on the same straight line as the lowermost end of the tubular portion 30. Further, the first plate-like portion 41 is relatively thin with respect to the tubular portion 30. For this reason, the cylindrical portion 30 has an inclined surface 32 at the other end of the cylindrical portion 30, and the inclined surface 32 is inclined so as to become higher toward one end of the cylindrical portion 30. .

折り曲げ部４２は、第１の板状部４１と第２の板状部４３との間に介在している。接続部４０は、この折り曲げ部４２で実質的に直角に折り曲げられている。なお、この折り曲げ部４２の折り曲げ角度は、直角に特に限定されず、任意に設定することができる。また、接続部４０に折り曲げ部４２を設けずに、第２の板状部４３を第１の板状部４１と実質的に同一平面上に設けてもよい。   The bent portion 42 is interposed between the first plate-like portion 41 and the second plate-like portion 43. The connecting portion 40 is bent at a substantially right angle by the bent portion 42. The bending angle of the bent portion 42 is not particularly limited to a right angle and can be set arbitrarily. Further, the second plate portion 43 may be provided on substantially the same plane as the first plate portion 41 without providing the bent portion 42 in the connection portion 40.

第２の板状部４３は、筒状部３０の延在方向（図中のＸ方向）に対して実質的に直交する方向（図中のＺ方向）に延在している。また、この第２の板状部４３には、ネジ穴４３１が形成されている。このネジ穴４３１にボルト等が挿入されることで、例えば、自動車のバッテリの端子等に端子２０の接続部４０が締結される。   The second plate-like portion 43 extends in a direction (Z direction in the drawing) substantially orthogonal to the extending direction of the cylindrical portion 30 (X direction in the drawing). Further, a screw hole 431 is formed in the second plate-like portion 43. By inserting a bolt or the like into the screw hole 431, the connecting portion 40 of the terminal 20 is fastened to, for example, a terminal of an automobile battery.

本実施形態では、筒状部３０の他端に傾斜面３２が設けられているので、電線１０が取り付けられた端子２０をバッテリの端子等に固定する際に、端子２０と周囲の部材との干渉を回避することができる。   In this embodiment, since the inclined surface 32 is provided at the other end of the cylindrical portion 30, when the terminal 20 to which the electric wire 10 is attached is fixed to a battery terminal or the like, the terminal 20 and the surrounding members Interference can be avoided.

なお、図４に示すように、筒状部３０に一対のディンプル３３を形成してもよい。図４は本発明の他の実施形態における端子を示す斜視図である。本実施形態における一対のディンプル３３が、本発明における一対の凹部の一例に相当する。   As shown in FIG. 4, a pair of dimples 33 may be formed on the cylindrical portion 30. FIG. 4 is a perspective view showing a terminal in another embodiment of the present invention. The pair of dimples 33 in the present embodiment corresponds to an example of a pair of recesses in the present invention.

それぞれのディンプル３３は、筒状部３０の外周面に窪みを形成していると共に、内側に向かって突出する凸部を挿入穴３１の内壁面に形成している。一対のディンプル３３は、相互に対向するように筒状部３０に形成されている（後述する図７参照）。本実施形態では、一方のディンプル３３は、筒状部３０の図中の上部に形成されているのに対し、他方のディンプル３３は、当該筒状部３０の図中の下部に形成されている。   Each dimple 33 has a recess formed on the outer peripheral surface of the cylindrical portion 30, and a convex portion protruding inward on the inner wall surface of the insertion hole 31. The pair of dimples 33 are formed in the cylindrical portion 30 so as to face each other (see FIG. 7 described later). In the present embodiment, one dimple 33 is formed at the upper portion of the cylindrical portion 30 in the figure, while the other dimple 33 is formed at the lower portion of the cylindrical portion 30 in the drawing. .

こうした一対のディンプル３３を筒状部３０に形成しておくことで、電圧印加工程Ｓ４０（後述）において溶接電流を集中させることができ、溶接条件の制御が容易となる。また、円形の筒状部３０への電極５１，５２の接触が確実となり、筒状部３０と電極５１，５２との接触抵抗を安定させることができる。   By forming such a pair of dimples 33 in the cylindrical portion 30, the welding current can be concentrated in the voltage application step S40 (described later), and the control of the welding conditions becomes easy. Moreover, the contact of the electrodes 51 and 52 to the circular cylindrical part 30 is ensured, and the contact resistance between the cylindrical part 30 and the electrodes 51 and 52 can be stabilized.

次に、本実施形態における端子付き電線の製造方法について、図５〜図６を参照しながら説明する。   Next, the manufacturing method of the electric wire with a terminal in this embodiment is demonstrated, referring FIGS.

図５は本実施形態における端子付き電線の製造方法を示す工程図、図６（ａ）〜図６（ｄ）は図５の各ステップを示す断面図である。   FIG. 5 is a process diagram showing a method of manufacturing a terminal-attached electric wire in the present embodiment, and FIGS. 6A to 6D are cross-sectional views showing steps in FIG.

先ず、図５のステップＳ１０において、図６（ａ）に示すように、電線１０の端部から所定の長さＬｏの絶縁層１３を剥いて、撚線１１を露出させる。次いで、図５のステップＳ２０において、図６（ｂ）に示すように、当該撚線１１の端部を端子２０の筒状部３０の挿入穴３１に挿入する。 First, in step S10 of FIG. 5, as shown in FIG. 6 (a), stripped insulation layer 13 of a predetermined length L o from the end of the wire 10 to expose the twisted wire 11. Next, in step S <b> 20 of FIG. 5, as shown in FIG. 6B, the end of the stranded wire 11 is inserted into the insertion hole 31 of the tubular portion 30 of the terminal 20.

次いで、図５のステップＳ３０において、図６（ｃ）に示すように、撚線１１の端部が挿入された端子２０の筒状部３０に、一対の電極５１，５２を上下から所定の圧力でそれぞれ押し付けて、一対の電極５１，５２で筒状部３０を挟み込む。なお、特に図示しないが、この一対の電極５１，５２は、電源や制御部を含む電圧印加装置に電気的に接続されている。   Next, in step S30 of FIG. 5, as shown in FIG. 6C, a pair of electrodes 51 and 52 are applied to the cylindrical portion 30 of the terminal 20 into which the end portion of the stranded wire 11 is inserted at a predetermined pressure from above and below. The cylindrical portion 30 is sandwiched between the pair of electrodes 51 and 52. Although not particularly shown, the pair of electrodes 51 and 52 are electrically connected to a voltage application device including a power source and a control unit.

また、このステップＳ３０において、図６（ｃ）に示すように、端子２０の接続部４０に放熱用の治具６０を接触させる。この治具６０は、アルミニウム、銅、ステンレス等の熱伝導性に優れた材料から構成されている。この治具６０によって、端子２０の接続部４０が冷却され、次工程の抵抗溶接時に生じる熱が放熱される。なお、このステップＳ３０において、放熱用の治具６０に代えて、例えば、端子２０の接続部４０に冷却用の流体を接触させることで、当該接続部４０を冷却してもよい。   Further, in step S30, as shown in FIG. 6C, a heat radiation jig 60 is brought into contact with the connection portion 40 of the terminal 20. The jig 60 is made of a material having excellent thermal conductivity such as aluminum, copper, and stainless steel. By this jig 60, the connection portion 40 of the terminal 20 is cooled, and heat generated during resistance welding in the next process is radiated. In this step S30, instead of the heat dissipating jig 60, the connecting portion 40 may be cooled by bringing a cooling fluid into contact with the connecting portion 40 of the terminal 20, for example.

次いで、図５のステップＳ４０において、図６（ｄ）に示すように、一対の電極５１，５２によって筒状部３０に圧力を印加しながら、当該電極５１，５２の間に電圧を印加して、筒状部３０と撚線１１に通電する。これにより、筒状部３０と撚線１１が抵抗発熱し、筒状部３０の挿入穴３１内の錫めっき層２２が溶融すると共に、それぞれの素線１２の錫被覆層１２３が溶融する。   Next, in step S40 of FIG. 5, as shown in FIG. 6D, a voltage is applied between the electrodes 51 and 52 while applying pressure to the cylindrical portion 30 by the pair of electrodes 51 and 52. The cylindrical portion 30 and the stranded wire 11 are energized. Thereby, the cylindrical part 30 and the stranded wire 11 generate resistance heat, the tin plating layer 22 in the insertion hole 31 of the cylindrical part 30 is melted, and the tin coating layer 123 of each strand 12 is melted.

そして、電極５１，５２を介した通電を停止すると、筒状部３０と撚線１１が冷却され、溶融していた錫が凝固して、素線１２同士が錫を介して接合されると共に、撚線１１と筒状部３０が錫を介して接合される。これにより、電線１０と端子２０が接続されて、端子付き電線１が完成する。   And when energization through the electrodes 51 and 52 is stopped, the cylindrical portion 30 and the stranded wire 11 are cooled, the molten tin is solidified, and the strands 12 are joined together via tin, The stranded wire 11 and the cylindrical part 30 are joined via tin. Thereby, the electric wire 10 and the terminal 20 are connected, and the electric wire 1 with a terminal is completed.

このように、本実施形態では、電線１０が錫被覆層１２３を有すると共に、端子２０が錫めっき層１２を有しており、抵抗溶接によって錫被覆層１２３及び錫めっき層１２を溶融させた後に錫を凝固させる。このため、電線１０と端子２０を強固に接続することができ、端子付き電線１の接続信頼性の向上を図ることができる。   Thus, in this embodiment, while the electric wire 10 has the tin coating layer 123 and the terminal 20 has the tin plating layer 12, the tin coating layer 123 and the tin plating layer 12 are melted by resistance welding. Allow tin to solidify. For this reason, the electric wire 10 and the terminal 20 can be firmly connected, and the connection reliability of the electric wire 1 with a terminal can be improved.

また、本実施形態では、抵抗溶接によって溶融した錫が撚線１１全体を覆うので、たとえＣＡ線のアルミニウム線１２１が露出した場合であっても、当該露出部分が錫で覆われている。このため、ガルバニック腐食による接触不良の発生を防止することができる。   Further, in the present embodiment, tin melted by resistance welding covers the entire stranded wire 11, so that the exposed portion is covered with tin even if the aluminum wire 121 of the CA wire is exposed. For this reason, generation | occurrence | production of the contact failure by galvanic corrosion can be prevented.

なお、上述の図４に示すように、筒状部３０にディンプル３３が形成されている場合には、図５のステップＳ３０において、図７に示すように、電極５１，５２をディンプル３３にそれぞれ当接させる。なお、図７は本発明の他の実施形態における挟持工程を示す断面図である。   As shown in FIG. 4 described above, when the dimple 33 is formed in the cylindrical portion 30, in step S30 of FIG. 5, the electrodes 51 and 52 are respectively attached to the dimple 33 as shown in FIG. Make contact. In addition, FIG. 7 is sectional drawing which shows the clamping process in other embodiment of this invention.

ディンプル３３を筒状部３０に形成しておくことで、図５のステップＳ４０において、当該ディンプル３３に溶接電流を集中させることができ、溶接条件の制御が容易となる。また、円形の筒状部３０への電極５１，５２の接触が確実となり、筒状部３０と電極５１，５２との接触抵抗を安定させることができる。   By forming the dimple 33 in the cylindrical portion 30, the welding current can be concentrated on the dimple 33 in step S40 of FIG. 5, and the control of the welding conditions becomes easy. Moreover, the contact of the electrodes 51 and 52 to the circular cylindrical part 30 is ensured, and the contact resistance between the cylindrical part 30 and the electrodes 51 and 52 can be stabilized.

本実施形態における図５のステップＳ２０が本発明における第１の工程の一例に相当し、本実施形態における図５のステップＳ３０が本発明における第２の工程の一例に相当し、本実施形態における図５のステップＳ４０が本発明における第３の工程の一例に相当する。   Step S20 in FIG. 5 in the present embodiment corresponds to an example of the first process in the present invention, and step S30 in FIG. 5 in the present embodiment corresponds to an example of the second process in the present invention. Step S40 in FIG. 5 corresponds to an example of a third step in the present invention.

なお、以上説明した実施形態は、本発明の理解を容易にするために記載されたものであって、本発明を限定するために記載されたものではない。したがって、上記の実施形態に開示された各要素は、本発明の技術的範囲に属する全ての設計変更や均等物をも含む趣旨である。   The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

例えば、上述の実施形態では、電線１０の素線１１として、錫被覆層１２３を有するＣＡ線を例示したが、錫被覆層を最外層に有する素線であれば、特にこれに限定されない。   For example, although the CA wire which has the tin coating layer 123 was illustrated as the strand 11 of the electric wire 10 in the above-mentioned embodiment, if it is a strand which has a tin coating layer in the outermost layer, it will not be specifically limited to this.

具体的には、素線として、錫めっき処理が施されたアルミニウム線、錫めっき処理が施された銅線、或いは、錫めっき処理が施されたＣＳ線等を用いてもよい。なお、ＣＳ線は、鋼線と、当該鋼線の外周を被覆する銅被覆層と、を有する素線である。   Specifically, an aluminum wire subjected to tin plating, a copper wire subjected to tin plating, a CS wire subjected to tin plating, or the like may be used as the element wire. In addition, CS wire is a strand which has a steel wire and the copper coating layer which coat | covers the outer periphery of the said steel wire.

１…端子付き電線
１０…電線
１１…撚線
１２…素線
１２１…アルミニウム線
１２２…銅被覆層
１２３…第１の錫被覆層
１３…絶縁層
２０…端子
２１…母材
２２…錫めっき層
３０…筒状部
３１…挿入穴
３２…傾斜面
３３…ディンプル
４０…接続部
４１…第１の板状部
４２…折り曲げ部
４３…第２の板状部
４３１…ネジ穴
５１，５２…電極
６０…放熱用の治具 DESCRIPTION OF SYMBOLS 1 ... Electric wire with a terminal 10 ... Electric wire 11 ... Twisted wire 12 ... Elementary wire 121 ... Aluminum wire 122 ... Copper coating layer 123 ... 1st tin coating layer 13 ... Insulating layer 20 ... Terminal 21 ... Base material 22 ... Tin plating layer 30 ... Cylindrical part 31 ... Insertion hole 32 ... Inclined surface 33 ... Dimple 40 ... Connection part 41 ... First plate-like part 42 ... Bending part 43 ... Second plate-like part 431 ... Screw holes 51, 52 ... Electrode 60 ... Heat dissipation jig

Claims (4)

少なくとも一つの導体を有する電線と、前記電線が固着された筒状部を一端に有する端子と、を備えた端子付き電線の製造方法であって、
前記導体の端部を前記筒状部に挿入する第１の工程と、
前記筒状部を一対の電極で挟む第２の工程と、
前記電極に電圧を印加する第３の工程と、を備えており、
前記導体は、錫を主成分とする材料からなる第１の錫被覆層を有し、
前記筒状部も、錫を主成分とする材料からなる第２の錫被覆層を少なくとも内壁面に有することを特徴とする端子付き電線の製造方法。 A method for producing a terminal-attached electric wire comprising: an electric wire having at least one conductor; and a terminal having at one end a cylindrical portion to which the electric wire is fixed,
A first step of inserting an end portion of the conductor into the cylindrical portion;
A second step of sandwiching the cylindrical portion between a pair of electrodes;
A third step of applying a voltage to the electrode,
The conductor has a first tin coating layer made of a material mainly containing tin,
The cylindrical part also has a second tin coating layer made of a material containing tin as a main component on at least an inner wall surface. 請求項１に記載の端子付き電線の製造方法であって、
前記端子は、他端に板状の接続部を有しており、
前記第３の工程は、前記接続部を冷却しながら、前記電極に電圧を印加することを含むことを特徴とする端子付き電線の製造方法。 It is a manufacturing method of the electric wire with a terminal according to claim 1,
The terminal has a plate-like connection at the other end,
The third step includes applying a voltage to the electrode while cooling the connection portion, and a method of manufacturing a terminal-attached electric wire. 請求項１又は２に記載の端子付き電線の製造方法であって、
前記筒状部は、一対の凹部を外周面に有しており、
前記第２の工程は、前記電極を前記凹部に当接させることを含むことを特徴とする端子付き電線の製造方法。 It is a manufacturing method of the electric wire with a terminal according to claim 1 or 2,
The cylindrical portion has a pair of recesses on the outer peripheral surface,
Said 2nd process includes making the said electrode contact | abut to the said recessed part, The manufacturing method of the electric wire with a terminal characterized by the above-mentioned. 請求項１〜３のいずれか一項に記載の端子付き電線の製造方法であって、
前記導体は、
アルミニウム線と、
前記アルミニウム線を被覆する銅被覆層と、
前記銅被覆層をさらに被覆する前記第１の錫被覆層と、を備えたことを特徴とする端子付き電線の製造方法。 It is a manufacturing method of the electric wire with a terminal according to any one of claims 1 to 3,
The conductor is
Aluminum wire,
A copper coating layer covering the aluminum wire;
A method for producing a terminal-attached electric wire, comprising: the first tin coating layer that further coats the copper coating layer.
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