Manufacturing method of terminal-equipped wire

Abstract

To provide a manufacturing method for a terminal-equipped wire that enables multiple wires to be crimped to a terminal fitting through a simple process.SOLUTION: A manufacturing method of a terminal-equipped wire includes a preparation step of preparing an electric wire 10 having a conductor 11 including a plurality of strands 13 and a terminal fitting 20 including a conductor crimping portion 22 for crimping the conductor 11, and a crimping step of crimping the conductor 11 with the conductor crimping portion 22 using an anvil 110 and a crimper 120, passing a current through the conductor 11 and the conductor crimping portion 22 via the anvil 110 and the crimper 120, and welding the strands 13 together with Joule heat generated by passing a current through the conductor 11 and the conductor crimping portion 22 to form a single wire, thereby crimping the single-wired conductor 11 to the conductor crimping portion 22.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a wire with a terminal.

Background Art

[0002] A general automotive wire harness includes a plurality of wires with terminals. The wire with a terminal includes a wire containing a plurality of strands and a terminal fitting, and the plurality of strands and the terminal fitting are connected by crimping the plurality of strands to the terminal fitting. However, if an oxide film is formed on the surface of the strands, the electrical resistance value between the plurality of strands and the terminal fitting may increase. Since there are parts of the oxide film formed on the surface of the strands that cannot be sufficiently broken simply by crimping, the oxide film was removed by sliding with ultrasonic vibration separately from the crimping process.

[0003] On the other hand, Patent Document 1 discloses a method for manufacturing a wire with a terminal having a crimping process. In the crimping process, the upper die is lowered toward the conductor crimping portion of the terminal fitting placed on the lower die, so that soldering is performed between the strands arranged on the inner wall surface side of the conductor crimping portion and the conductor crimping portion is crimped to the strands. Further, in the crimping process, the solder provided on the inner wall surface of the conductor crimping portion or between the strands is melted, and ultrasonic vibration is applied to the upper die or the lower die at any timing when the solder is in a molten state or during the entire period when the solder is in a molten state.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] According to the prior art, the cavitation effect of ultrasonic vibration can remove the oxide film on the surface of the wire strands and the conductor crimping part. Then, soldering is performed between the inner wall surface of the conductor crimping part from which the oxide film has been removed and the wire strands, and between the wire strands, and the resistance values between the conductor crimping part and the wire strands and between the wire strands can be kept low. However, since it is necessary to use solder in the conventional method for manufacturing a wire with terminals, there has been a demand for a simple method for manufacturing a wire with terminals that does not require the use of solder.

[0006] The present invention has been made in view of the problems of such prior art. And the object of the present invention is to provide a method for manufacturing a wire with terminals capable of crimping a plurality of wire strands to a terminal fitting in a simple process.

Means for Solving the Problems

[0007] The method for manufacturing a wire with terminals according to an aspect of the present invention includes a preparation step of preparing a wire including a conductor including a plurality of wire strands and a terminal fitting including a conductor crimping part for crimping the conductor. The method for manufacturing a wire with terminals includes a crimping step of crimping the conductor with the conductor crimping part by an anvil and a crimper, passing an electric current through the conductor and the conductor crimping part via the anvil and the crimper, and welding the wire strands together by Joule heat generated by passing the electric current through the conductor and the conductor crimping part to form a single wire, and then crimping the single-wire conductor to the conductor crimping part.

Effects of the Invention

[0008] According to the present invention, it is possible to provide a method for manufacturing a wire with terminals capable of crimping a plurality of wire strands to a terminal fitting in a simple process.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

[0010] Hereinafter, a method for manufacturing an electric wire with a terminal according to the present embodiment will be described in detail with reference to the drawings. Note that the dimensional ratios in the drawings are exaggerated for the convenience of explanation and may be different from the actual ratios.

[0011] [First Embodiment] First, a method for manufacturing an electric wire with a terminal according to the first embodiment will be described with reference to FIGS. 1 to 6. The method for manufacturing an electric wire with a terminal includes a preparation step and a crimping step.

[0012] (Preparation Step) As shown in FIG. 1, the preparation step is a step of preparing the electric wire 10 and the terminal fitting 20. The electric wire 10 includes a conductor 11 and an insulating coating 12 that covers the outer periphery of the conductor 11. At the end of the electric wire 10, the insulating coating 12 is peeled off and the conductor 11 is exposed from the insulating coating 12. The conductor 11 includes a plurality of strands 13. The plurality of strands 13 may include a collective stranded wire formed by bundling a plurality of strands. Further, the conductor 11 may be composed of only one collective stranded wire, or may be a composite stranded wire formed by bundling a plurality of collective stranded wires.

[0013] Each of the plurality of strands 13 may contain copper or aluminum as a main component. Here, the main component means the metal with the highest molar ratio among the metals contained in each strand 13. Among the metals contained in each strand 13, the metal with the highest molar ratio may be contained in a molar ratio of 50% or more, 60% or more, 70% or more, 80% or more, 90% or more, or 95% or more. The material of each strand 13 may be, for example, copper, aluminum, or an alloy containing these metals. From the viewpoint of weight reduction, it is preferable that each of the plurality of strands 13 is formed of aluminum or an aluminum alloy.

[0014] As the material of the insulating coating 12, a thermoplastic resin capable of ensuring electrical insulation can be used. The material of the insulating coating 12 may contain, for example, at least one of an olefin-based resin and polyvinyl chloride. The olefin-based resin may contain, for example, at least one or more resins selected from the group consisting of polyethylene (PE), polypropylene (PP), ethylene copolymers, and propylene copolymers.

[0015] The terminal fitting 20 includes a terminal connection portion 21, a conductor crimping portion 22, a coating crimping portion 23, a first joint portion 24, and a second joint portion 25. The terminal connection portion 21 is provided at one end of the terminal fitting 20, and the conductor crimping portion 22 is provided at the other end of the terminal fitting 20. In this specification, the side where the terminal connection portion 21 of the terminal fitting 20 is provided is referred to as the front side, and the side where the coating crimping portion 23 is provided is referred to as the rear side for explanation.

[0016] The terminal connection portion 21 is provided at the front portion in the longitudinal direction of the terminal fitting 20 and is configured to be connected to a mating terminal (not shown). When the terminal connection portion 21 is connected to the terminal connection portion of the mating terminal, the terminal fitting 20 is mechanically and electrically connected to the mating terminal. The terminal connection portion 21 has a box-like shape with a cylindrical space inside and incorporates a spring piece that engages with the mating terminal inside.

[0017] The conductor crimping part 22 is provided at the rear part of the terminal fitting 20 in the longitudinal direction of the terminal fitting 20. Specifically, the conductor crimping part 22 is provided between the terminal connection part 21 and the covering crimping part 23 in the longitudinal direction of the terminal fitting 20. The conductor crimping part 22 crimps and presses the conductor 11 of the electric wire 10 and is in direct contact with the conductor 11. The conductor crimping part 22 includes a bottom plate 26 for placing the conductor 11 and a pair of conductor crimping pieces 27 connected to the bottom plate 26 for wrapping and crimping the conductor 11 in the radial direction. The pair of conductor crimping pieces 27 extend upward from the edge parts on both the left and right sides of the bottom plate 26. The conductor crimping part 22 is formed in a U-shaped or V-shaped cross-sectional view by the bottom plate 26 and the pair of conductor crimping pieces 27 before the crimping of the electric wire 10. In the present embodiment, when the conductor 11 is crimped by the pair of conductor crimping pieces 27, the conductor 11 is crimped to the terminal fitting 20 so as to have a B shape.

[0018] The covering crimping part 23 is provided at the rear part of the conductor crimping part 22 in the longitudinal direction of the terminal fitting 20. The covering crimping part 23 crimps the insulating covering 12 provided at the end of the electric wire 10 and is in direct contact with the insulating covering 12. The covering crimping part 23 includes a bottom plate 26 for placing the electric wire 10 and a pair of covering crimping pieces 28 connected to the bottom plate 26 for wrapping and crimping the electric wire 10 in the radial direction. The pair of covering crimping pieces 28 extend upward from the edge parts on both the left and right sides of the bottom plate 26. The covering crimping part 23 is formed in a U-shaped or V-shaped cross-sectional view by the bottom plate 26 and the pair of covering crimping pieces 28 before the crimping of the electric wire 10. In the present embodiment, when the insulating covering 12 is crimped by the pair of covering crimping pieces 28, the insulating covering 12 is crimped to the terminal fitting 20 in a state where the pair of covering crimping pieces 28 overlap each other.

[0019] The first joint part 24 connects between the terminal connection part 21 and the conductor crimping part 22 in the longitudinal direction of the terminal fitting 20. The first joint part 24 includes a bottom plate 26 and a pair of side plates extending upward from the edge parts on both the left and right sides of the bottom plate 26. The first joint part 24 is formed in a U-shaped or V-shaped cross-sectional view by the bottom plate 26 and the pair of side plates.

[0020] The second joint portion 25 connects between the conductor crimping portion 22 and the covering crimping portion 23 in the longitudinal direction of the terminal fitting 20. The second joint portion 25 includes a bottom plate 26 and a pair of side plates extending upward from the edge portions on both the left and right sides of the bottom plate 26. The second joint portion 25 is formed in a U-shaped or V-shaped cross section by the bottom plate 26 and the pair of side plates.

[0021] In this embodiment, the terminal fitting 20 is formed by bending a single plate-like member. Therefore, the bottom plate 26 of the terminal connection portion 21 to the bottom plate 26 of the covering crimping portion 23 is continuously formed as a single common bottom plate 26. Further, the front and rear ends of the low-profile side plates of the first joint portion 24 are continuously formed with the rear end of the side plate of the terminal connection portion 21 and the lower half of the front end of each of the pair of conductor crimping pieces 27 of the conductor crimping portion 22, respectively. The front and rear ends of the low-profile side plates of the second joint portion 25 are continuously formed with the rear end of the pair of conductor crimping pieces 27 of the conductor crimping portion 22 and the lower half of the front end of each of the pair of covering crimping pieces 28 of the covering crimping portion 23, respectively.

[0022] The terminal fitting 20 is formed of a conductive material. The material forming the terminal fitting 20 may include at least one metal selected from the group consisting of, for example, copper, aluminum, iron, and magnesium. The surface of the terminal fitting 20 may or may not be plated.

[0023] The terminal fitting 20 may contain copper or aluminum as a main component. The main component means the metal having the largest molar ratio among the metals contained in the terminal fitting 20. Among the metals contained in the terminal fitting 20, the metal having the largest molar ratio may be contained in a molar ratio of 50% or more, 60% or more, 70% or more, 80% or more, 90% or more, or 95% or more. The material of the terminal fitting 20 may be, for example, copper, aluminum, or an alloy containing these metals, respectively. From the viewpoint of conductivity, it is preferable that the terminal fitting 20 is formed of copper or a copper alloy.

[0024] (Crimping process) The crimping process is a process of crimping the conductor 11 to the conductor crimping part 22. By crimping the conductor 11 to the conductor crimping part 22, the conductor 11 of the electric wire 10 is mechanically and electrically connected to the terminal fitting 20.

[0025] In the crimping process, the exposed part of the conductor 11 of the electric wire 10 is inserted onto the bottom plate 26 of the terminal fitting 20. Thereby, the conductor 11 is placed on the upper surface of the bottom plate 26 of the conductor crimping part 22. Also, the part of the electric wire 10 with the insulating coating 12 is placed on the upper surface of the bottom plate 26 of the coating crimping part 23.

[0026] In the crimping process, crimping can be performed using a crimping device 100 as shown in FIG. 2. The crimping device 100 includes an anvil 110 and a crimper 120 that moves up or down with respect to the anvil 110. The anvil 110 is a table on which the terminal fitting 20 is placed and supports the bottom plate 26 of the terminal fitting 20. The crimper 120 is arranged to face the anvil 110 in the vertical direction. The crimper 120 moves up and down by a lifting mechanism such as a crank piston mechanism, a cylinder piston mechanism, a ball screw mechanism, or a linear motor, and can approach or move away from the anvil 110. In this embodiment, the case where the anvil 110 is fixed and the crimper 120 moves up and down will be described, but the crimper 120 may be fixed and the anvil 110 may be moved up and down. As shown in FIG. 3, the crimper 120 has a guide groove 121.

[0027] The guide groove 121 includes a protruding portion 122 and curved surfaces 123 provided at both ends of the protruding portion 122 in the short side direction of the terminal fitting 20. The protruding portion 122 protrudes toward the anvil 110. The curved surface 123 is connected to the protruding portion 122 and is recessed and curved in an arc shape in the direction opposite to the protruding direction of the protruding portion 122. The guide groove 121 is formed in an M shape when viewed from the longitudinal direction of the terminal fitting 20 by the protruding portion 122 and the curved surface 123.

[0028] As shown in FIG. 3, when the crimper 120 descends, the conductor crimping piece 27 of the terminal fitting 20 is introduced into the guide groove 121.

[0029] As shown in FIG. 4, when the crimper 120 further descends, the pair of conductor clamping pieces 27 starts to bend along the curved surface 123. Then, the pair of conductor clamping pieces 27 bend inward so as to wrap around the conductor 11 of the electric wire 10, and the tips 29 of the pair of conductor clamping pieces 27 gradually approach the protrusion 122.

[0030] As shown in FIG. 5, when the crimper 120 further descends, the tips 29 of the pair of conductor clamping pieces 27 abut against each other, and are further guided by the protrusion 122 to change the direction downward and bite into the conductor 11. In this way, the conductor clamping part 22 is clamped so that the tips 29 of the pair of conductor clamping pieces 27 bite into the conductor 11. By causing the tips 29 of the pair of conductor clamping pieces 27 to bite into the conductor 11, the mechanical connection with the conductor 11 having a large strand diameter can be strengthened. And it is clamped so that the conductor 11 is in close contact with the upper surface of the bottom plate 26. In this way, the anvil 110 and the crimper 120 can clamp the conductor 11 at the conductor clamping part 22.

[0031] Also, in the crimping process according to the present embodiment, as shown by the arrow in FIG. 5, while clamping the conductor 11 at the conductor clamping part 22, an electric current is passed through the conductor 11 and the conductor clamping part 22 via the anvil 110 and the crimper 120. Then, as shown in FIG. 6, the strands 13 are welded together by the Joule heat generated by passing an electric current through the conductor 11 to form a single wire. And the single-wired conductor 11 is crimped to the conductor clamping part 22. Thereby, the conductor clamping part 22 is electrically and mechanically connected to the single-wired conductor 11. Specifically, the conductor clamping part 22 covers the conductor 11 so as to surround the circumferential direction of the single-wired conductor 11. In the crimping process, since the conductor 11 can be made into a single wire and the single-wired conductor 11 can be crimped to the conductor clamping part 22, a plurality of strands 13 can be crimped to the terminal fitting 20 in a simple process.

[0032] In the crimping process, by using the anvil 110 and the crimper 120 as electrodes, current may be passed through the conductor 11 and the conductor crimping portion 22 via the anvil 110 and the crimper 120. The anvil 110 and the crimper 120 are electrically connected to a power source (not shown), and current can be passed through the conductor 11 by applying a voltage between the anvil 110 and the crimper 120 by the power source. The current may be direct current or alternating current. Also, the direction in which the current flows may be from the anvil 110 to the crimper 120 or from the crimper 120 to the anvil 110. Then, by melting the metal due to the Joule heat generated in the conductor 11, the conductor 11 can be crimped at the conductor crimping portion 22 and the individual strands 13 can be welded simultaneously.

[0033] In the crimping process, current may be passed through the conductor 11 at least at any one point in time while the crimper 120 is closest to the anvil 110. The conductor crimping portion 22 usually has the largest amount of deformation when the crimper 120 is closest to the anvil 110. In the crimping process, current may be instantaneously passed at least at any one point in time while the crimper 120 is closest to the anvil 110. In the crimping process, current may be continuously passed at least at any one point in time while the crimper 120 is closest to the anvil 110. In the crimping process, current may be passed at least at any one point in time from when the crimper 120 is closest to the anvil 110 until the crimper 120 starts to rise. The current may be passed intermittently through the conductor 11 or continuously. When the crimper 120 is moved up and down by a crank piston mechanism, the state where the crimper 120 is closest to the anvil 110 may be the bottom dead center. Also, in the crimping process, current may be passed from when the crimper 120 descends and contacts the conductor crimping portion 22 until the crimper 120 rises and separates from the conductor crimping portion 22.

[0034] The single-stranded conductor 11 is provided at the end of the electric wire 10, but it does not necessarily have to be provided at the terminal end. By providing the single-stranded conductor 11 at the end of the electric wire 10, it is possible to suppress the intrusion of water from the end of the conductor 11 into the insulation coating 12. It is preferable that the single-stranded conductor 11 has no voids, but it may contain a small amount of voids.

[0035] In addition, for example, when an aluminum electric wire and a copper terminal are welded, there is a possibility that brittle intermetallic compounds are generated at the bonding interface of dissimilar metals. However, in this embodiment, the molten intermetallic compounds can be discharged to the outside by crimping in the crimping process. Therefore, it is possible to suppress the deterioration of the function of the terminal fitting 20 due to the intermetallic compounds.

[0036] Although the crimping method of the conductor crimping portion 22 has been described, except for passing an electric current, the coating crimping portion 23 can also be crimped by the same method. For example, the pair of coating crimping pieces 28 of the coating crimping portion 23 may be bent inward so as to wrap the portion with the insulation coating 12, and the conductor crimping portion 22 may be crimped so that the insulation coating 12 is in close contact with the upper surface of the bottom plate 26. By crimping the insulation coating 12 with the pair of coating crimping pieces 28, the electric wire 10 and the terminal fitting 20 can be firmly and mechanically connected.

[0037] In addition, the method for manufacturing the wire with a terminal may include a step of forming an anti-corrosion material after the crimping step. In the step of forming the anti-corrosion material, a liquid anti-corrosion material is applied and cured to a portion where the conductor 11 and the terminal fitting 20 are in contact, such as a joint between the conductor 11 and the second joint portion 25. The anti-corrosion material can be formed, for example, by curing at least one of a monomer and an oligomer. At least one of the monomer and the oligomer may be an ultraviolet-curable resin or the like. The ultraviolet-curable resin can be instantaneously cured by irradiating ultraviolet rays. The anti-corrosion material is provided at the joint between the conductor 11 and the terminal fitting 20. When the materials of the conductor 11 and the terminal fitting 20 of the wire 10 are different, corrosion is likely to occur at the joint due to the difference in ionization tendency. Therefore, by providing the anti-corrosion material at the joint, the occurrence of corrosion can be suppressed.

[0038] [Second Embodiment] Next, the method for manufacturing the wire with a terminal according to the second embodiment will be described with reference to FIGS. 7 and 8. In the method for manufacturing the wire with a terminal according to the first embodiment, the terminal fitting 20 was formed by bending a single plate-like member having a uniform thickness. On the other hand, in the method for manufacturing the wire with a terminal according to the second embodiment, the tip 29 of the conductor crimping piece 27 is processed so as to promote the heat generation and melting inside the conductor 11 by the Joule heat generated by passing an electric current through the conductor 11 and the conductor crimping portion 22. Hereinafter, the method for manufacturing the wire with a terminal according to the second embodiment will be described in detail, but the description of the overlapping parts with the first embodiment will be omitted.

[0039] The conductor crimping portion 22 of the terminal fitting 20 prepared in the preparation step includes, as described above, the bottom plate 26 and a pair of conductor crimping pieces 27 connected to the bottom plate 26 for crimping the conductor 11. The tips 29 of the pair of conductor crimping pieces 27 are configured to bite into the conductor 11 when the conductor 11 is crimped at the conductor crimping portion 22. The tip 29 of the conductor crimping piece 27 is formed so that its volume is smaller than that when the conductor crimping piece 27 is formed with the same thickness as the bottom plate 26.

[0040] Specifically, as shown in FIG. 7, in the clamping direction in which the conductor clamping piece 27 of the terminal fitting 20 according to the present embodiment clamps the conductor 11, the thickness T1 of the tip 29 is thinner than the thickness T2 of the bottom plate 26. More specifically, in the clamping direction, the conductor clamping piece 27 gradually becomes thinner from the bottom plate 26 toward the tip 29.

[0041] In the crimping process, the tips 29 of the pair of conductor clamping pieces 27 bite into the conductor 11 when the conductor 11 is clamped by the conductor clamping portion 22. In the method for manufacturing an electric wire with a terminal according to the present embodiment, as shown in FIG. 8, the thickness T3 of the tip 29 of the conductor clamping piece 27 that bites into the inside of the conductor 11 during clamping is thinner than the case where the bottom plate 26 has the same thickness and the conductor clamping piece 27 is formed. When the thickness T1 of the tip 29 of the conductor clamping piece 27 is thinner than the thickness T2 of the bottom plate 26, compared with the case where the thickness T1 is the same as the thickness T2, the volume of the tip 29 of the conductor clamping piece 27 becomes smaller, and the amount of current required to generate the same Joule heat can be reduced. Therefore, even when there is a variation in the amount of current flowing through the conductor 11 and the terminal fitting 20 when a current is passed through the conductor 11 and the conductor clamping portion 22, the heat generation and melting inside the conductor 11, which is the most difficult to transfer heat, can be promoted.

[0042] Note that the tip 29 of the conductor clamping piece 27 may have at least one selected from the group consisting of a thin-walled portion thinner than the thickness T2 of the bottom plate 26 as shown in FIG. 7, a plurality of recesses, and a plurality of through holes. Even when the tip 29 of the conductor clamping piece 27 has such a structure, the volume of the tip 29 of the conductor clamping piece 27 is smaller than the case where the conductor clamping piece 27 is formed with the same thickness T1 as the bottom plate 26, and the heat generation and melting inside the conductor 11 can be promoted.

[0043] As described above, the method for manufacturing a wire with a terminal according to the present embodiment includes a preparation step of preparing a wire 10 including a conductor 11 including a plurality of strands 13 and a terminal fitting 20 including a conductor crimping portion 22 for crimping the conductor 11. The method for manufacturing a wire with a terminal includes crimping the conductor 11 with the conductor crimping portion 22 using an anvil 110 and a crimper 120, and passing an electric current through the conductor 11 and the conductor crimping portion 22 via the anvil 110 and the crimper 120, and by welding the strands 13 together with the Joule heat generated by passing the electric current through the conductor 11 and the conductor crimping portion 22 to form a single wire, and includes a crimping step of crimping the single-wired conductor 11 to the conductor crimping portion 22.

[0044] Thus, in the method for manufacturing a wire with a terminal according to the present embodiment, the conductor 11 can be made into a single wire while being crimped. Further, since the oxide film on the surface of the strand 13 is broken by welding, it is possible to suppress an increase in the electrical resistance between the strands 13. Therefore, before the crimping step, it is not necessary to join between the strands 13 of the wire 10 by another process such as ultrasonic welding. That is, it is not necessary to provide dedicated equipment for the joining step of joining between the strands 13, and the working time can be reduced. Therefore, according to the method for manufacturing a wire with a terminal according to the present embodiment, a plurality of strands 13 can be crimped to the terminal fitting 20 with a simple process.

[0045] The wire with a terminal can be used for a wire harness used in a vehicle such as an automobile.

[0046] Note that an example in which the conductor 11 is crimped to the conductor crimping portion 22 so as to be a so-called B-crimp has been described. However, the crimping style of the terminal fitting 20 is not limited to such a form, and the conductor 11 may be crimped to the conductor crimping portion 22 in a form such as an overlap crimp. Further, the conductor crimping portion 22 of the terminal fitting 20 may be a sleeve type having a cylindrical shape, a split sleeve type in which a plurality of parts are combined and crimped, or the like.

[0047] Although the present embodiment has been described above, the present embodiment is not limited to these, and various modifications are possible within the scope of the gist of the present embodiment.

Description of Symbols

[0048] 10 Electric wire 11 Conductor 20 Terminal fitting 22 Conductor crimping part 110 Anvil 120 Crimper

Claims

1. A preparation step of preparing an electric wire including a conductor including a plurality of wires and a terminal fitting including a conductor clamping portion for clamping the conductor; a crimping process in which the conductor is crimped at the conductor crimping portion using an anvil and a crimper, and an electric current is passed through the conductor and the conductor crimping portion via the anvil and the crimper, and the wires are welded together and converted into a single wire by Joule heat generated by passing the electric current through the conductor and the conductor crimping portion, thereby crimping the single wired conductor into the conductor crimping portion; A method for manufacturing an electric wire with a terminal, comprising:

2. The method for manufacturing an electric wire with a terminal according to claim 1 , wherein in the crimping step, a current is caused to flow through the conductor at least at any time while the crimper is closest to the anvil.

3. The method for manufacturing an electric wire with a terminal according to claim 1 or 2, wherein each of the plurality of wires is made of aluminum or an aluminum alloy.

4. The method for manufacturing an electric wire with a terminal according to claim 1 or 2, wherein the terminal fitting is made of copper or a copper alloy.

5. the conductor clamping portion of the terminal fitting prepared in the preparation step includes a bottom plate and a pair of conductor clamping pieces connected to the bottom plate for clamping the conductor, and a tip of the conductor clamping piece has a smaller volume than when the conductor clamping piece is formed to the same thickness as the bottom plate, The method for manufacturing an electric wire with a terminal according to claim 1 , wherein tips of the pair of conductor clamping pieces bite into the conductor when the conductor is clamped by the conductor clamping portion.

6. 6. The method for manufacturing an electric wire with a terminal according to claim 5, wherein a tip of the conductor clamping piece has at least one selected from the group consisting of a thin-walled portion thinner than a thickness of the bottom plate, a plurality of recesses, and a plurality of through holes.

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