JP2018081757A - Manufacturing method of conductive member including element wire joint and conductive member including element wire joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To integrate two or more element wires of a conductive member more reliably in a compact form.SOLUTION: A manufacturing method of a conductive member of an element wire joint includes (a) a step of preparing a conductive member (for example, a core wire 12) obtained by gathering two or more element wires 13 in a linear shape, (b) a step of forming a pressurizing part 14 by pressing the two or more element wires 13 in at least a part of the extending direction of the conductive member, and (c) a step of forming an element wire joint 15 by welding and non-pressurizing the pressurizing part 14.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a technique for joining a plurality of wires of a conductive member used as a wiring material or the like in a vehicle.

  A crimping technique, a welding technique, or the like is used as a technique for connecting a conductor included in an electric wire to another conductive member.

  For example, Patent Document 1 discloses a method of forming a crimped portion in which the conductor is exposed by peeling off the coating of an end portion of an electric wire formed by coating a conductor in which a plurality of strands are gathered, and the tip side of the crimped portion In this, a technique is disclosed in which a bonding portion is bonded to the non-bonded portion of the portion to be bonded after bonding the strands to each other to form a bonded portion on the distal end side and a non-bonded portion on the proximal end side. Yes.

  A similar technique is disclosed in Patent Document 2.

  In Patent Document 3, a recess for receiving the welded portion of the electric wire in multidirectional contact is formed in the welded portion of the terminal member, and the welded portion of the electric wire is brought into contact with the recessed portion of the terminal member from above. The technique which irradiates a laser beam and welds the welding part of the said electric wire to the dent of the said terminal member with the laser energy of the said laser beam is disclosed.

  In Patent Document 4, the wire is brought into contact with the terminal member while the wire is inclined with respect to the surface of the terminal member while the wire is held by a clamp, and the laser is irradiated to the wire. A technique for joining the wire to a terminal member is disclosed.

  Patent document 5 irradiates the vicinity of the end of the wire conductor part exposed by peeling off the insulation coating at the end of the electric wire, melts the end of the electric wire conductor part, and causes the surface tension of the molten metal to A plurality of wires that are fused and solidified and integrated with the ends of the wire conductor portions are arranged so that a part of each of the integrated portions is in contact with each other, and further, the integrated portions are melted so that the respective integrated portions are melted. A technique is disclosed in which a high energy density beam is irradiated on the chemical conversion part and the contacted integrated parts are fused and integrated by surface tension.

Japanese Patent Laid-Open No. 9-7647 JP-A-2006-1551 Japanese Patent Laid-Open No. 11-214113 JP 2009-202158 A JP 2013-16366 A

  However, according to the techniques disclosed in Patent Documents 1 and 2, a plurality of strands are in a disjoint state at a portion of the conductor where the crimp terminal is crimped. For this reason, there exists a possibility that a strand may protrude from the crimping part of a crimp terminal. In addition, the protruding wire may be cut and scattered around.

  Further, according to the techniques disclosed in Patent Documents 3 and 4, when a welded part or a wire is an assembly of a plurality of strands, if a plurality of strands vary and a large gap is generated between the strands, There is a risk that the wire of the part cannot be welded to the site to be welded.

  Further, according to the technique disclosed in Patent Document 5, the end of the electric wire conductor is irradiated with a high energy density beam in the vicinity of the end of the electric wire conductor exposed by peeling off the insulating coating at the end of the electric wire, and the front end of the electric wire conductor is melted. Although the molten metal is melted and integrated and solidified by the surface tension of the molten metal, if a plurality of strands vary and a large gap is formed between the strands, all the strands cannot be fused and integrated. Moreover, if the tip of the electric wire conductor is melted and melted and integrated by the surface tension of the molten metal to be solidified, the outer diameter of the integrated portion becomes large. For this reason, there exists a problem that the part which melt-integrated several integrated parts by surface tension will enlarge, for example.

  Then, an object of this invention is to enable it to integrate more reliably the some strand of a conductive member with a compact form.

  In order to solve the above-mentioned problem, a method of manufacturing a conductive member having a strand joint according to the first aspect includes (a) a step of preparing a conductive member in which a plurality of strands are gathered to form a linear shape, (B) a step of pressurizing the plurality of strands to form a pressurizing portion in at least a part of the extending direction of the conductive member; and (c) a strand that is non-pressure welded to the pressurizing portion. Forming a joint portion.

  A 2nd aspect is a manufacturing method of the electrically-conductive member which has a strand joining part which concerns on a 1st aspect, Comprising: In the said process (c), it is so that these several strands may maintain linear shape. The pressure part is welded.

  A 3rd aspect is a manufacturing method of the electrically-conductive member which has a strand joined part which concerns on a 1st or 2nd aspect, Comprising: In the said process (b), the said addition is performed rather than the part which is not pressurized among the said electrically-conductive member. The plurality of strands are pressurized so that the pressure section becomes thinner.

  A 4th aspect is a manufacturing method of the electrically-conductive member which has a strand joint part which concerns on any one 1st-3rd aspect, Comprising: The said pressurization part is laser-welded by the said process (c).

  A 5th aspect is a manufacturing method of the electrically-conductive member which has a strand joining part which concerns on any one 1st-4th aspect, Comprising: (d) The process of connecting a terminal to the said strand joining part, Further prepare.

  In order to solve the above-mentioned problem, in the conductive member having the strand joining portion according to the sixth aspect, a part of the extending direction of the conducting member assembled so that the plurality of strands form a linear shape is strand joined. As a part, it is formed in the non-pressure welding part thinner than another part.

  A 7th aspect is an electroconductive member which has the strand joining part which concerns on a 6th aspect, Comprising: In the said strand joining part, the said some strand maintains the linear shape.

  An eighth aspect is a conductive member having a strand joining portion according to the sixth or seventh aspect, wherein a terminal is connected to the strand joining portion.

  According to the first aspect, at least a part of the extending direction of the conductive member pressurizes the plurality of strands to form a pressurizing portion, and the pressurizing portion is non-pressure welded. Can be more reliably integrated in a compact form.

  According to the second aspect, in the step (c), the pressurizing part is welded so that the plurality of strands remain in a linear shape. Easy to reflect on the shape. For this reason, it is easy to form a strand joining part in a desired shape.

  According to the third aspect, in order to pressurize the plurality of strands so that the pressurizing portion is thinner than the portion of the conductive member that is not pressed, the gap between the plurality of strands is made as small as possible in the pressurizing portion. be able to. By welding to this pressurizing part, a plurality of strands can be more reliably integrated in a compact form.

  According to the 4th aspect, a pressurization part can be easily welded by laser welding.

  According to the 5th aspect, the connection part can be reduced in size, suppressing the protrusion of a strand at the connection part of an electroconductive member and a terminal.

  According to the sixth aspect, a part of the extending direction of the conductive member assembled so that a plurality of strands form a linear shape is a non-pressure welded portion that is thinner than the other portions as the strand joining portion. Since it is formed, a plurality of strands can be more reliably integrated in a compact form.

  According to the 7th aspect, it is easy to form a strand joined part in a desired shape.

  According to the 8th aspect, the connection part can be reduced in size, suppressing the protrusion of a strand at the connection part of an electroconductive member and a terminal.

It is a schematic side view which shows the electric wire which concerns on 1st Embodiment. It is a schematic front view which shows an electric wire. It is explanatory drawing which shows the process of forming a pressurizing part. It is explanatory drawing which shows the process of forming a pressurizing part. It is a schematic side view which shows a pressurization part. It is explanatory drawing which shows the process of forming a strand joining part. It is a schematic side view which shows a strand joining part. It is a schematic sectional drawing which shows a strand joining part. It is the A partial enlarged view of FIG. It is explanatory drawing which shows a comparative example. It is a schematic perspective view which shows the electric wire with a terminal which concerns on a 1st modification. It is a schematic side view which shows the electric wire with a terminal which concerns on a 2nd modification. It is a schematic side view which shows the connection structure of the electric wire which concerns on a 3rd modification. It is a schematic side view which shows the electrically-conductive member which concerns on 2nd Embodiment. It is explanatory drawing which shows the process of forming a pressurizing part. It is a schematic side view which shows a pressurization part. It is explanatory drawing which shows the process of forming a strand joining part. It is explanatory drawing which shows the process of cut | disconnecting a strand joined part. It is a schematic side view which shows the cut strand connection part.

{First embodiment}
Hereinafter, the electrically-conductive member which has the strand joining part which concerns on 1st Embodiment, and its manufacturing method are demonstrated.

  First, the manufacturing method of the electrically-conductive member which has a strand joined part is demonstrated.

  As shown in FIG.1 and FIG.2, the electric wire 10 which has the core wire 12 as a electrically-conductive member is prepared (step (a)).

  The electric wire 10 includes a core wire 12 and a coating 18.

  The core wire 12 is an assembly of a plurality of strands 13 so as to form a linear shape. The plurality of strands 13 may be twisted together or may not be twisted together. Here, the number of strands is seven, but is not limited to this number. Each strand 13 is formed of a metal wire such as aluminum, an aluminum alloy, copper, or a copper alloy wire. Plating such as tin plating may be formed on the surface of each strand 13.

  The covering 18 is an insulating part that covers the periphery of the core wire 12. The coating 18 is formed, for example, by extrusion coating an insulating material such as a resin around the core wire 12.

  The coating 18 is peeled off at the end of the electric wire 10, and a core wire exposed portion 12 a where the core wire 12 is exposed is formed at this portion.

  Next, as shown in FIG. 3 to FIG. 5, at least a part of the extending direction of the core wire 12 pressurizes the plurality of strands 13 to form the pressurizing portion 14 (step (b)).

  Here, the pressurizing portion 14 is formed by pressurizing the plurality of strands 13 at the tip end portion of the core wire exposed portion 12a. You may pressurize a some strand over the whole longitudinal direction of a core wire exposure part, and you may form a pressurization part.

  The said pressurization can be performed using the metal mold | die 20 provided with the lower mold | type 21 and the upper mold | type 24, for example. That is, the lower mold 21 and the upper mold 24 are members formed of metal or the like. The lower mold 21 is formed with a groove-shaped lower mold surface 22 that is recessed downward from above. Here, the lower mold surface 22 is formed in a rectangular groove shape. The upper mold 24 is formed with a protrusion 25 that protrudes downward and can be disposed in the lower mold surface 22. The downward surface of the protrusion 25 is the upper mold surface 26.

  Then, in a state where the core wire exposed portion 12 a is accommodated in the lower mold surface 22, the protrusion 25 is pushed in from above the lower mold surface 22, and the core wire exposed portion 12 a is compressed between the lower mold surface 22 and the upper mold surface 26. Press to apply pressure. Then, each strand 13 is plastically deformed and gathers beyond the elastic deformation region. Each strand 13 initially has a circular cross section, but is pressed in the compression direction so as to fill a gap between each strand 13 between the lower mold surface 22 and the upper mold surface 26. Deform. Due to the deformation at this time, a new surface is generated on the surface of each strand 13 and the strands 13 adhere to each other. Thereby, the pressurization part 14 with which the some strand 13 was maintained by the aggregated form is formed. Here, the pressurizing unit 14 is formed in a square bar shape, more specifically, in a square bar shape flat in one direction (vertical direction). The shape of the pressing portion is not limited to the above example, and may be processed into other polygonal bar shapes, round bar shapes, or the like.

  Under the present circumstances, the some strand 13 is pressurized so that the pressurization part 14 may become thinner than the part which is not pressurized among the core wires 12. FIG. Thereby, the clearance gap between the some strand 13 will be in the state smaller than before pressurization. Preferably, the cross-sectional area of the pressurizing unit 14 in the cross section orthogonal to the extending direction of the pressurizing unit 14 is the sum of the cross-sectional areas of the plurality of strands 13 before pressurization (excluding gaps in the strands 13). The plurality of strands 13 are pressurized so as to be compressed so that the total cross-sectional area). Thereby, it is possible to eliminate gaps between the plurality of strands 13 as much as possible while preventing the strands 13 from being stretched as thinly as possible.

  In order to maintain the assembly state of the plurality of strands 13 more reliably, at least one of the lower mold surface 22 and the upper mold surface 26 may be heated. The heating temperature is a temperature at which the wire 13 can be melted. In the case where a plating such as tin plating is formed on the surface of the element wire 13, the temperature may be such that the plating can be melted. But the some strand 13 is welded by the following process. For this reason, even when at least one of the lower mold surface 22 and the upper mold surface 26 is heated, a temperature at which the wire 13 or the plating can be partially melted near the surface of the pressurizing portion 14, that is, temporary bonding It is preferable that the temperature is as high as possible.

  Thereafter, as shown in FIGS. 6 to 9, the pressure member 14 is non-pressure welded to form the wire joint 15 (step (c)).

  Here, as non-pressure welding, without applying pressure from the outside to each of the strands 13 of the pressurizing unit 14 that is a welding target, applying energy from the outside and welding the strands 13 together. Say. For example, laser welding (see FIG. 6) in which the pressurizing unit 14 is irradiated with a laser beam 32 from the nozzle 30 to weld the strands 13 to each other, and an electron beam is caused to collide with the pressurizing unit 14 to generate heat by the generated heat. A method of applying a high energy density beam to the pressurizing portion 14 and welding, such as electron beam welding for welding the wires 13, corresponds to a method of non-pressure welding. Moreover, arc welding which welds the strands 13 using the arc released in the air, such as TIG (Tungsten Inert Gas) welding, also corresponds to the method of non-pressure welding.

  Here, the plurality of strands 13 are welded to each other by laser welding in which the pressurizing unit 14 is irradiated with the laser beam 32 from the nozzle 30 to weld the strands 13 to each other.

  There is no particular limitation on the wavelength of the laser beam. For example, the laser beam oscillates with a substance added with Nd of YAG, called 532 nm (called a green laser), 1030 nm (called a disk laser), 1064 nm (called a YAG (Yttrium Aluminum Garnet) laser). A laser having a wavelength of 1070 to 1080 nm (what is called a fiber laser) can be used.

  When manufacturing the strand joining part 15, it is preferable to weld the pressurizing part 14 so that the some strand 13 may remain linear. FIG. 9 is an example of an enlarged cross-sectional view of a portion A in FIG. As shown in the figure, plating 13m is formed on the surface of the plurality of strands 13, and at the time of welding, each strand 13 is not melted or hardly melted, but mainly the plating 13m is melted and melted. Wires 13 are joined to each other by plating 13m. For example, when the melting point of the material for forming the plating is lower than the melting point of the material for forming the wire 13, the welding is performed mainly under conditions that allow the plating to be melted. More specifically, if the strand 13 is made of aluminum (melting point is about 660 degrees) or copper (melting point is about 1085 degrees) and the plating is tin plating (the melting point of tin is about 232 degrees), Welding is performed under conditions where only the tin plating is melted by adjusting the output of the laser beam, the irradiation time, and the like.

  Of course, even if the wire 13 is not plated, for example, the surface of the wire close to the surface of the pressurizing portion 14 is mainly irradiated with laser light to perform welding. The wires 13 may be gathered while maintaining the linear shape.

  Further, within a range in which the shape of the pressurizing unit 14 can be maintained as much as possible, a part of the plurality of strands 13 (for example, the strand 13 near the surface of the pressurizing unit 14) or all of them melts once and the linear shape collapses. It may be.

  Accordingly, as shown in FIG. 7 to FIG. 9, a part in the extending direction of the core wire 12, which is a conductive member in which a plurality of strands 13 are gathered so as to form a line, The structure formed in the non-pressure welding part thinner than this part can be obtained.

  Note that the non-pressure welding portion is a portion where the plurality of strands 13 are non-pressure welded. The term welded part itself, a term that identifies the structure or characteristics of an object, has a well-established concept. The term unwelded welded part is also a structure that is welded while applying pressure, such as resistance welding or ultrasonic welding. Can be clearly distinguished in terms of structure depending on the presence or absence of pressure marks, etc., and the structure is merely specified by simply indicating the state.

  The effect by the electrically-conductive member (core wire 12) which has the strand connection part 15 comprised as mentioned above, and its manufacturing method is demonstrated.

  For example, as illustrated in FIG. 10, when laser light 32 is irradiated toward the plurality of strands 13 without pressurizing the plurality of strands 13 in advance, a large gap is generated between the plurality of strands 13. It is assumed that In this case, even if the strand 13 is melted by the laser beam 32, the adjacent strand 13 is not in contact with each other, so that the adjacent strands 13 may not be welded to each other.

  On the other hand, in the present embodiment, the plurality of strands 13 are pressed by at least a part of the core wire 12 to form the pressurizing portion 14, and the pressurizing portion 14 is non-pressure welded. For this reason, non-pressure welding is performed in a state where the plurality of strands 13 are closer to each other, and the plurality of strands 13 are welded so as to be more reliably integrated in a more compact form.

  Further, if the degree of melting each strand 13 is reduced by non-pressure welding, a plurality of strands 13 can be welded while maintaining the original shape of the pressure portion 14 as much as possible. For example, when the pressurizing unit 14 is welded so that the plurality of strands 13 remain in a linear shape, the plurality of strands 13 can be welded while maintaining the original shape of the pressurizing unit 14 as much as possible. For this reason, it becomes easy to reflect the shape of the pressurizing part 14 in the shape of a strand joining part, and it is easy to form the strand joining part 15 in a desired shape. Here, the pressurization part 14 can be formed in a square bar shape, and the strand joining part 15 can also be formed in a square bar shape corresponding to the shape. If the strand joining part 15 is formed in the shape of a square bar, as will be described later, welding can be performed in a state where the surrounding flat surface is in surface contact with another member.

  Moreover, since the several strand 13 is pressurized so that the pressurization part 14 may become thinner than the part which is not pressurized among the core wires 12, in the pressurization part 14, the clearance gap between the several strand 13 is made as small as possible. can do. And by welding with respect to this pressurization part 14, the some strand 13 can be integrated more reliably with a more compact form.

  Moreover, the pressurizing part 14 can be easily welded by performing laser welding as the non-pressure welding.

  It should be noted that welding a plurality of strands in a desired shape can be realized by resistance welding and ultrasonic welding, but this embodiment has advantages over those welding methods.

  That is, in resistance welding, there is a defect that the welding electrode sandwiching the welding object is easily deteriorated and consumed. On the other hand, in the present embodiment, the lower die 21 and the upper die surface 26 basically simply pressurize the plurality of strands 13, and therefore, compared with a welding electrode used for resistance welding. It is hard to deteriorate and wear out. In addition, since an apparatus or the like that performs laser welding does not directly contact and weld an object to be welded, it has an advantage that it is less likely to be deteriorated and consumed than a welding electrode. Further, in ultrasonic welding, there is a restriction on the welding object, and for example, it is difficult to successfully weld a plated wire. In contrast, laser welding or the like has few such restrictions, and for example, plated wires can be firmly welded together.

  Based on the above embodiment, various modifications will be described.

  FIG. 11 is a schematic perspective view showing a terminal-attached electric wire 110 including a core wire 12 which is a conductive member having a wire joining portion 15 according to a first modification.

  The electric wire with terminal 110 includes the electric wire 10 and the terminal 120.

  The terminal 120 is a metal plate member made of copper, a copper alloy, or the like. A plating such as tin plating may be formed on the surface of the terminal 120. One end of the terminal 120 is formed on the wire connecting portion 122, and the other end is formed on the mating side connecting portion 124. The electric wire connection part 122 is formed in plate shape. The counterpart side connection part 124 is a part to which the electric wire 10 is connected. Here, the counterpart connection portion 124 is formed in a plate-like portion in which the hole 124h is formed. Then, a nut is screwed and tightened to the bolt in a state where the bolt erected on the other conductive portion (metal plate or the like) to be connected is inserted into the hole 124h. As a result, the counterpart connection portion 124 is sandwiched between the conductive portion and the nut, and the counterpart connection portion 124 is kept in contact with and electrically in contact with the conductive portion. In addition, the mating connection portion 124 may have a pin-shaped or tab-shaped male terminal shape or a cylindrical female terminal shape.

  The terminal 120 is connected to the strand joining part 15 by adding the process (step (d)) which connects the terminal 120 to the said strand joining part 15. FIG. Here, the strand joining portion 15 is welded to one main surface of the wire connecting portion 122. Here, the wire connecting portion 122 and the wire joining portion 15 are laser welded in a state where one flat side surface around the wire joining portion 15 is brought into surface contact with one main surface of the wire connecting portion 122. . Since the wire joining portion 15 welded in a state where the plurality of strands 13 are gathered as described above is welded to the wire connecting portion 122, the wire connecting portion 122 and the wire joining portion 15 are stable. And it welds in the state which contacted the surface, and also the strand 13 varies from the connection part, and it is hard to stick out. Moreover, since the strand joining part 15 itself is non-pressurized and welded after pressurization and has a relatively compact form, the connection location between the terminal 120 and the strand joining part 15 can be made compact. .

  The welding of the wire assembly portion and the terminal may be performed by ultrasonic welding, resistance welding or the like in addition to laser welding. Further, the wire assembly portion and the terminal may be soldered.

  FIG. 12: is a schematic side view which shows the electric wire 210 with a terminal provided with the core wire 12 which is a electrically-conductive member which has the strand joining part 15 which concerns on a 2nd modification.

  The electric wire with terminal 210 includes the electric wire 10 and the terminal 220.

  The terminal 220 is a metal plate member made of copper, copper alloy, or the like. A plating such as tin plating may be formed on the surface of the terminal 220. One end of the terminal 220 is formed on the electric wire connecting portion 221, and the other end is formed on the mating side connecting portion 224. The counterpart connection part 224 is a part to which the electric wire 10 is connected, similarly to the first modified example. Similarly to the first modified example, the mating side connection portion 224 is formed in a plate-like portion in which a hole is formed, and is connected to a portion serving as a mating side connection destination by a bolt and a nut. Of course, the mating side connection part 224 may have a pin-shaped or tab-shaped male terminal shape, or a cylindrical female terminal shape.

  The wire connection part 221 is a part formed so as to be capable of being crimped to the wire joining part 15. More specifically, the electric wire connecting portion 221 includes a bottom portion 222 and a pair of crimping pieces 223 that rise from both sides of the bottom portion 222. Then, in a state where the strand joining portion 15 is disposed on the bottom portion 222, the pair of crimping pieces 223 is plastically deformed inward, so that the strand joining portion 15 is surrounded by the bottom portion 222 and the pair of crimping pieces 223. In this state, the wire connecting portion 221 is crimped and connected to the strand joining portion 15 (step (d)). At this time, if the strand bonding portion 15 keeps the plurality of strands 13 in a linear shape, the plurality of strands 13 are deformed and the pair of crimping pieces 223 are brought into close contact with the strand joining portion 15. Can be crimped.

  In the case of this modification, since the wire connecting part 221 is pressure-bonded to the wire joining part 15 that is welded in a state where the plurality of strands 13 are gathered as described above, the wire 13 scatters and protrudes from the connecting part. hard. Further, since the wire bonding part 15 itself is non-pressure welded after being pressurized, it has a relatively compact form, and the connection part between the terminal 220 and the wire bonding part 15 is made compact. Can do.

  The terminals 120 and 220 may be provided with a coated crimp portion.

  FIG. 13: is a schematic side view which shows the connection structure 310 (connection structure of an electrically-conductive member) of the electric wire 10 provided with the core wire 12 which is the electrically-conductive member which has the strand joining part 15 which concerns on a 3rd modification.

  In the third modification, a plurality (two in this case) of the electric wires 10 are provided. The strand joining portions 15 are laser-welded with the two strand joining portions 15 in surface contact with one flat side surface around each of the strand joining portions 15. Portions of the core wire 12 extending from the wire joining portion 15 and covered with the coating 18 extend to the opposite sides.

  Since the strand joints 15 welded in a state where a plurality of strands 13 are assembled as described above are welded together, the strand joints 15 are welded in a state of being in surface contact stably, It is difficult for the wire 13 to vary from the connecting portion. Moreover, since the strand joining part 15 itself is non-pressure welded after pressurization and has a relatively compact form, the connecting portion between the strand joining parts 15 can be made compact.

  The welding of the wire joint portions 15 may be performed by ultrasonic welding, resistance welding, or the like in addition to laser welding. Moreover, the strand joining portions 15 may be connected by soldering or the like. Similarly to the second modified example, in the state where the plurality of strand joining portions 15 are overlapped, the relay terminal having the crimping portion is crimped, and the plurality of strand joining portions 15 are connected to each other. Also good.

  In the third modified example, the core wires 12 extending from the wire joining portions 15 and the portions covered by the covering 18 extend to opposite sides, but extend in the same direction. Also good. Moreover, in this 3rd modification, although the two strand joining parts 15 are the structures welded, three or more strand joining parts may be connected by welding etc.

{Second Embodiment}
A conductive member having a wire bonding portion according to the second embodiment and a manufacturing method thereof will be described. In the description of the present embodiment, the description of the same content as that described in the first embodiment may be omitted.

  First, the manufacturing method of the electrically-conductive member which has a strand joined part is demonstrated.

  As shown in FIG. 14, the conductive member 410 is prepared (step (a)).

  In the present embodiment, the conductive member 410 is a braided wire in which a plurality of strands 413 are knitted in a cylindrical shape. The plurality of strands may be knitted into a sheet shape. As in the first embodiment, the element wire 413 is formed of a metal wire such as aluminum, an aluminum alloy, copper, or a copper alloy wire, and a plating such as tin plating is formed on the surface of each element wire 413. May be.

  Next, as shown in FIGS. 15 and 16, a plurality of wires 413 are pressed at least in a part of the extending direction of the conductive member 410 to form a pressing portion 414 (step (b)).

  Here, the pressurizing part 414 is formed by pressurizing the plurality of strands 413 at the intermediate part in the extending direction of the long conductive member 410. The plurality of strands may be pressed at any end in the extending direction of the conductive member 410 to form a pressing portion, or the plurality of strands may be pressed across the extending direction of the conductive member 410. The pressurizing part may be formed.

  The pressurization can be performed using a mold 420 including a lower mold 421 and an upper mold 424, as in the first embodiment. That is, the lower mold 421 and the upper mold 424 are members formed of metal or the like. The lower mold 421 is formed with a groove-shaped lower mold surface 422 that is recessed downward from above. Here, the lower mold surface 422 is formed in a rectangular groove shape. The width dimension of the lower mold surface 422 may be the same as the width dimension of the conductive member 410 or may be smaller than the width dimension of the conductive member 410. The upper mold 424 has a protrusion 425 that protrudes downward and can be disposed in the lower mold surface 422. The downward surface of the protrusion 25 is an upper mold surface 426.

  Then, in a state in which the intermediate portion in the extending direction of the conductive member 410 is accommodated in the lower mold surface 422, the protrusion 425 is pushed in from above the lower mold surface 422 to conduct electricity between the lower mold surface 422 and the upper mold surface 426. The intermediate portion of the member 410 is pressurized so as to be compressed. As a result, the strands 413 are plastically deformed and gathered beyond the elastic deformation region. In addition, there is a relatively large gap between the strands 413 at the beginning. By pressurizing in the compression direction, the gap is filled between the lower mold surface 422 and the upper mold surface 426. Deform. Due to the deformation at this time, a new surface is generated on the surface of each wire 413, and the wires 413 adhere to each other. Thereby, the pressurization part 414 in which the some strand 413 was maintained by the aggregated form is formed. Here, the pressurizing unit 414 is formed in a flat rectangular bar shape, and the shape of the pressurizing unit is not limited to the above example, and may be processed into other polygonal bar shapes, round bar shapes, or the like.

  At this time, as in the first embodiment, the plurality of strands 413 are pressurized so that the pressurizing portion 414 is thinner than the portion of the conductive member 410 that is not pressed. Thereby, the clearance gap between the some strands 413 will be in the state smaller than before pressurization. Preferably, the cross-sectional area of the pressurizing part 414 in the cross section orthogonal to the extending direction of the pressurizing part 414 is the sum of the cross-sectional areas of the plurality of strands 413 before pressurization (the sum of the cross-sectional areas excluding the gap). The plurality of strands 413 are pressurized so as to be compressed. Thereby, the gaps between the plurality of strands 413 can be eliminated as much as possible while preventing the strands 413 from being stretched as thinly as possible.

  As described in the first embodiment, at least one of the lower mold surface 422 and the upper mold surface 426 may be heated in order to more reliably maintain the assembled state of the plurality of strands 413.

  Then, as shown in FIG. 17, the pressurizing part 414 is non-pressure welded to form the wire joining part 415 (step (c)).

  Here, as described in the first embodiment, as non-pressure welding, energy is applied from the outside without pressing each wire 413 of the pressure unit 414 that is a welding object. , It means welding each strand 413. Here, similarly to the first embodiment, for example, laser welding is performed by irradiating the pressurizing unit 414 with the laser beam 32 from the nozzle 30 to weld the strands 413 to each other.

  Since the pressurizing unit 414 is preliminarily pressurized and has a configuration in which the strands 413 are gathered, the strands 413 are well welded even in a non-pressurized state. Thereby, the strand joining part 415 is formed.

  The wavelength of the laser beam is not particularly limited as in the first embodiment.

  Further, in manufacturing the wire joining portion 415, as described in the first embodiment, the pressurizing portion is used so that the plurality of strands 413 remain in a linear shape (knitted form). It is preferable to weld 414. For example, when plating is formed on the surfaces of the plurality of strands 413, during welding, the strands 413 are not melted or hardly melted, and the plating is mainly melted. It is preferable that they are joined together. Alternatively, for example, even when the wire 413 is not plated, for example, laser welding is performed so as to melt the surface of the wire close to the surface of the pressurizing unit 414, and welding is performed. The plurality of strands 413 may be gathered while maintaining the linear shape.

  Moreover, within the range which can keep the shape of the pressurization part 414 as much as possible, some or all of the some strand 413 may melt | dissolve once and the line shape may collapse.

  Thereby, as shown in FIG. 18, a part of the extending direction of the conductive member 410 in which the plurality of strands 413 are assembled so as to form a linear shape is thinner than the other portions as the strand joining portion 415. The structure formed in the non-pressure welding part can be obtained.

  Further, in the present embodiment, as shown in FIG. 19, the wire joining portion 415 of the conductive member 410 is cut along the width direction at an intermediate portion in the direction along the extending direction of the conductive member 410. The The cutting can be performed by, for example, a cutting blade 430, laser welding, or the like. Thereby, if one strand joint part 415 is formed in the extending direction intermediate part of the conductive member 410, and this is cut, the strand joint part 415A at one end of each of the two conductive members 410A and 410B. 415B can be formed. Further, if a plurality of strand joining portions 415 are formed in the extending direction intermediate portion of the long conducting member 410 and the respective strand joining portions 415 are cut, respective end portions of the plurality of conducting members 410A and 410B Also, the wire bonding portions 415A and 415B can be formed. Thereby, the wire joint portions 415A and 415B can be efficiently formed at the end portions of the plurality of conductive members 410A and 410B.

  Further, when the strand joining portion 415 is cut, the strand 413 is easily separated at the cut end portion. Therefore, as described above, if the intermediate portion in the extending direction of the conductive member 410 is subjected to pressure and non-pressure welding, the wire 413 is more difficult to be separated.

  Similarly to the first embodiment, terminals are welded or crimped to the wire joining portions 415A and 415B at the ends of the conductive members 410A and 410B. Or other conductive members, such as a core wire of an electric wire, are welded to the strand joining part 415A, 415B of the edge part of conductive member 410A, 410B.

  In these cases, it is possible to reduce the size of the connecting portion between the wire bonding portion 415A (or 415B) and the terminal or other conductive member while suppressing the protrusion of the wire 413.

{Modifications}
In addition, each structure demonstrated by each said embodiment and each modification can be suitably combined unless it mutually contradicts.

  For example, in 1st Embodiment, a core wire may be exposed in the extension direction intermediate part of an electric wire, and a strand joining part may be formed in the said core wire. This wire joint portion may be cut in the same manner as in the second embodiment, and also remains in the intermediate portion in the extending direction of the electric wire while remaining in the intermediate portion or the end portion in the extending direction of the other electric wires. The wire joint portion may be connected by welding or the like.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Electric wire 12 Core wire 12a Core wire exposed part 13, 413 Wire 13m Plating 14, 414 Pressurization part 15, 415, 415A, 415B Wire joint part 20, 420 Mold 21, 421 Lower mold 24, 424 Upper mold 30 Nozzle 32 Laser beam 110, 210 Electric wire with terminal 120, 220 Terminal 122, 221 Electric wire connection part 310 Electric wire connection structure 410, 410A, 410B Conductive member

Claims (8)

(A) preparing a conductive member assembled such that a plurality of strands form a line;
(B) forming a pressurizing portion by pressing the plurality of strands in at least a part of the extending direction of the conductive member;
(C) forming the wire joint by non-pressure welding of the pressurizing part;
The manufacturing method of the electrically-conductive member which has a strand joining part provided with. It is a manufacturing method of the electrically-conductive member which has a strand joined part of Claim 1,
The manufacturing method of the electrically-conductive member which has a strand joining part which welds the said pressurization part so that the said some strand may maintain the linear shape in the said process (c). It is a manufacturing method of the electrically-conductive member which has a strand joined part of Claim 1 or Claim 2,
In the step (b), a method for producing a conductive member having a wire joining portion, wherein the plurality of strands are pressurized such that the pressurizing portion is thinner than a portion of the conductive member that is not pressed. It is a manufacturing method of the electrically-conductive member which has a strand joined part of any one of Claims 1-3,
In the step (c), a method for manufacturing a conductive member having a wire joining portion, wherein the pressing portion is laser-welded. It is a manufacturing method of the electrically-conductive member which has a strand joined part of any one of Claims 1-4,
(D) The manufacturing method of the electrically-conductive member which has the process of connecting a terminal to the said strand joining part, The strand joining part further provided.   A part of the extending direction of the conductive member assembled so that a plurality of strands form a linear shape is formed in a non-pressure welded portion that is thinner than the other portion as a strand joining portion A conductive member having a joint. A conductive member having a strand joint according to claim 6,
The conductive member which has a strand joining part in which the said strand has maintained linear shape in the said strand joining part. A conductive member having the strand joint according to claim 6 or 7,
A conductive member having a strand joining portion, wherein a terminal is connected to the strand joining portion.

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