JP2020091996A - Method of manufacturing electric wire with terminal - Google Patents

Abstract

To provide a method for manufacturing an electric wire with a terminal which is excellent in tensile strength at a place where a terminal is crimped to a conductor core wire.SOLUTION: A method for manufacturing an electric wire with a terminal includes the steps of: applying ultrasonic vibration processing to a conductor core wire 12 so that the tensile strength of the conductor core wire 12 in the step of applying the ultrasonic vibration processing is higher than that of the conductor core wire 12 before the ultrasonic vibration processing is applied; and crimping a terminal 20 to the conductor core wire 12 to which the ultrasonic vibration processing is applied. According to this manufacturing method, the tensile strength of the conductor core wire 12 can be improved.SELECTED DRAWING: Figure 5

Description

The present invention relates to a method for manufacturing an electric wire with a terminal.

BACKGROUND ART Conventionally, an electric wire having a core wire bundle (for example, a stranded wire) in which a plurality of conductor core wires are bundled has been proposed from the viewpoint of increasing the allowable current of the electric wire and improving the bending strength. When a terminal is crimped to such a core wire bundle (stranded wire), the conductor core wire located on the outer peripheral portion of the core wire bundle is in direct contact with the terminal and electrically connected, but is located in the central portion of the core wire bundle. The conductor core wire is electrically connected to the terminal via the conductor located on the outer peripheral portion. Therefore, in order to improve the overall conductivity between the core wire bundle and the terminal, in addition to the conductivity between the conductor core wire and the terminal (the conductivity of the outer peripheral portion), the conductivity between the conductor core wires is also increased. It is desirable to improve (conductivity of the central portion).

On the other hand, in recent years, aluminum and aluminum alloys may be used as the material of the conductor core wire because of their lighter weight and lower cost than copper. However, in this case, since the oxide film (aluminum oxide) that is naturally formed on the surface of the conductor core wire has a high insulating property, various properties for improving the above-mentioned conductivity (conductivity of the outer peripheral portion/conductivity of the central portion) are provided. It is required to devise.

For example, in one of the conventional methods of manufacturing an electric wire with a terminal, ultrasonic wave vibration treatment is applied to a core wire bundle (stranded wire) made of an aluminum conductor core wire to destroy an oxide film on the surface of the conductor core wire. Meanwhile, the conductor core wires are joined to each other to integrate the core wire bundle (single wire). As a result, both the conductor core wire located in the outer peripheral portion of the core wire bundle and the conductor core wire located in the central portion substantially come into direct contact with the terminals. As a result, compared to the case where such a single wire is not formed, the conductivity of the central portion is improved, and thus the overall conductivity between the core wire bundle and the terminal can be improved (for example, Patent Document 1). See 1, 2).

JP, 2016-115525, A JP, 2014-029884, A

By the way, according to the experiments and consideration conducted by the inventor, when the terminal is crimped to the core wire bundle integrated by the above-described conventional manufacturing method, the conductivity between the core wire bundle and the terminal can be improved, It has been clarified that the cross-sectional area of the core wire bundle is reduced due to the pressure bonding, and the tensile strength of the core wire bundle may be reduced. If the tensile strength of the core wire bundle is excessively reduced, when the wire with a terminal is actually used and the external force is applied to the wire due to the reason that the peripheral members come into contact with the wire, the terminals of the core wire bundle will be crimped. Damaged parts may occur. In this case, the electrical conductivity between the core wire bundle and the terminal may not be properly maintained, and the performance of the electric wire with terminal may deteriorate.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a method of manufacturing an electric wire with a terminal, which is excellent in tensile strength at a portion where a terminal is crimped to a conductor core wire.

In order to achieve the above-mentioned object, the method of manufacturing an electric wire with a terminal according to the present invention is characterized by the following [1] to [4].
[1]
A method for manufacturing an electric wire with a terminal in which a terminal is crimped to a conductor core wire of an electric wire,
In the step of subjecting the conductor core wire to ultrasonic vibration treatment, the ultrasonic vibration treatment is performed so that the tensile strength of the conductor core wire is higher than the tensile strength of the conductor core wire before the ultrasonic vibration treatment. The process of applying
Crimping the terminal to the conductor core wire subjected to the ultrasonic vibration treatment,
It must be a method of manufacturing electric wires with terminals.
[2]
In the method of manufacturing an electric wire with a terminal according to the above [1],
The ultrasonic vibration treatment,
The tensile strength of the conductor core wire after the ultrasonic vibration treatment is 10% or more higher than the tensile strength of the conductor core wire before the ultrasonic vibration treatment.
It must be a method of manufacturing electric wires with terminals.
[3]
In the method of manufacturing an electric wire with a terminal according to the above [1] or the above [2],
The ultrasonic vibration treatment,
With respect to the cross-sectional area S1 of the conductor core wire before the ultrasonic vibration treatment, the cross-section area S1 of the conductor core wire before the ultrasonic vibration treatment cuts off the conductor core wire after the ultrasonic vibration treatment. When the ratio of the value obtained by subtracting the area S2 ((S1−S2)/S1) is defined as the compression ratio, the compression ratio is less than 10%.
It must be a method of manufacturing electric wires with terminals.
[4]
In the method of manufacturing an electric wire with a terminal according to any one of the above [1] to [3],
The conductor core wire is
Composed of aluminum or aluminum alloy,
It must be a method of manufacturing electric wires with terminals.

According to the method of manufacturing an electric wire with a terminal having the above configuration [1], ultrasonic vibration treatment is applied to the conductor core wire before the terminals are crimped. This ultrasonic vibration treatment is performed so that the tensile strength of the conductor core wire after the treatment is higher than the tensile strength of the conductor core wire before the treatment. According to experiments conducted by the inventor, the processing time of ultrasonic vibration processing, the amplitude and frequency of ultrasonic vibration, etc. are determined based on the thickness and material of the conductor core wire, and the number of conductor core wires. It has been clarified that the tensile strength of the conductor core wire can be improved by adjusting. Therefore, according to the manufacturing method of this configuration, it is possible to manufacture an electric wire with a terminal having excellent tensile strength at a portion where the terminal is crimped to the conductor core wire. According to the study by the inventor, the improvement of the tensile strength of the conductor core wire is caused by, for example, the transition of the crystal orientation of the conductor core wire from a random state to a regular state with ultrasonic vibration. Conceivable.

Regarding the method of manufacturing the electric wire with a terminal having the above-mentioned configuration [2], according to an experiment conducted by the inventor, according to the magnitude of the energy applied to the conductor core wire during ultrasonic vibration treatment, the conductor core wire is pulled. It has been revealed that the intensity does not change simply linearly but changes along a predetermined characteristic curve (see FIGS. 5 and 6). In other words, based on the characteristic curve obtained based on the experiment conducted in advance, it is possible to understand how much energy should be applied to the conductor core wire to improve the tensile strength of the conductor core wire. Here, from the viewpoint of improving the tensile strength in a portion where the terminal is crimped to the conductor core wire in practical use, the tensile strength of the conductor core wire after the treatment is preferably 10% or more higher than the tensile strength of the conductor core wire before the treatment. ..

According to the method of manufacturing an electric wire with a terminal having the above configuration [3], the ultrasonic vibration treatment is performed so that the compressibility related to the cross-sectional area of the conductor core wire before and after the treatment is less than 10%. Therefore, the cross-sectional area of the conductor core wire is not significantly reduced before and after the treatment. As a result, even if the terminal is crimped onto the conductor core wire after the ultrasonic vibration treatment, the cross-sectional area of the conductor core wire does not become excessively small, and the resistance of the electric wire with a terminal against an external force exerted on the electric wire can be further improved.

According to the method of manufacturing an electric wire with a terminal having the above-mentioned configuration [4], an oxide film or an aluminum alloy, which has a larger insulation property of an oxide film formed on the surface than a generally used copper conductor core wire (copper wire), is used. When the conductor core wire (aluminum electric wire) is used, the effect of improving the tensile strength (that is, the resistance of the electric wire with a terminal against an external force exerted on the electric wire) can be obtained.

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the electric wire with a terminal excellent in the tensile strength in the location where the terminal was crimped|bonded with the conductor core wire can be provided.

The present invention has been briefly described above. Further, the details of the present invention will be further clarified by reading through the modes for carrying out the invention described below (hereinafter referred to as “embodiments”) with reference to the accompanying drawings.

FIG. 1 is a diagram illustrating a series of steps of a method for manufacturing an electric wire with a terminal according to an embodiment of the present invention, and FIGS. 1A and 1B are perspective views of an end portion of the electric wire. Yes, FIG. 1C and FIG. 1D are perspective views of a state in which the terminal is crimped to the end portion of the electric wire. 2A and 2B are views for explaining the transition of the shape of the core wire bundle of the electric wire. FIG. 2A is a front view of the core wire bundle before ultrasonic vibration is applied, and FIG. 2B is ultrasonic vibration. It is a front view of a core wire bundle after being subjected to. FIG. 3 is a schematic diagram of an ultrasonic vibration device that applies ultrasonic vibration processing to a core wire bundle. FIG. 4 is a schematic diagram of a terminal crimping device that crimps a terminal to an electric wire. FIG. 5 is a graph showing the effect of ultrasonic vibration on the tensile strength of a core wire bundle (conductor core wire). FIG. 6 is a graph showing the effect of ultrasonic vibration on the tensile strength of a core wire bundle (conductor core wire).

Hereinafter, a method of manufacturing an electric wire with a terminal according to an embodiment of the present invention will be described with reference to the drawings.

<Outline>
First, an outline will be described. When crimping the terminal 20 to the electric wire 10, after ultrasonic vibration processing is performed by the ultrasonic vibration device 30 from the viewpoint of improving the tensile strength of the conductor core wire 12, the terminal is crimped by the terminal crimping device (anvil 40 and crimper 50). 20 crimping processes are performed. Hereinafter, the configurations and operations of these devices will be described in detail.

First, as shown in FIG. 1A, in the method for manufacturing an electric wire with a terminal according to the present embodiment, the insulation coating 11 of the electric wire 10 is peeled off to expose a core wire bundle 13 composed of a plurality of conductor core wires 12. .. Next, as shown in FIG. 1B, the core wire bundle 13 is subjected to ultrasonic vibration processing (details will be described later) to form a processed core wire 13A. As shown in FIG. 1A, the electric wire 10 is configured such that the outer circumference of a core wire bundle 13 having a circular cross section in which a plurality of conductor core wires 12 are bundled is covered with an insulating coating 11. In this example, the conductor core wire 12 is a non-plated element wire made of aluminum or an aluminum alloy. In other words, the electric wire 10 is a so-called aluminum electric wire or an aluminum alloy electric wire.

After that, as shown in FIG. 1C, after the processed core wire 13A is arranged at a predetermined position of the terminal 20, the terminal 20 is treated as shown in FIG. Pressure is applied to the coating 11) (details will be described later). The electric wire with a terminal 1 is manufactured through the series of steps described above.

<Details>
Next, each of the above steps will be described in more detail.

As shown in FIGS. 1B and 3, regarding the ultrasonic vibration treatment applied to the core wire bundle 13, the processed core wire 13A, which is the core wire bundle 13 after the ultrasonic vibration treatment, is attached to the axis thereof. It has a rectangular shape in a cross section orthogonal to each other. In the post-processed core wire 13A, some or all of the plurality of conductor core wires 12 forming the core wire bundle 13 may or may not be bonded to each other by ultrasonic vibration.

An ultrasonic vibration device 30 that performs such ultrasonic vibration processing will be described with reference to FIG. As shown in FIG. 4, the ultrasonic vibration device 30 includes a horn 31, a fixed side plate 32, a movable slide core 33, and an anvil 34. The horn 31 is adapted to vibrate ultrasonically in the front-back direction of the paper surface in the figure by an ultrasonic oscillator. On the upper surface of the horn 31 (the surface that comes into contact with the core wire bundle 13), knurls (not shown) formed of a plurality of ridges extending in the direction orthogonal to the vibration direction are formed. It is designed to prevent slippage between the two. In the ultrasonic vibration device 30, a rectangular space in cross section defined by the horn 31, the side plate 32, the slide core 33, and the anvil 34 is defined as a bonding processing chamber V, and the bonding processing chamber V is arranged in this bonding processing chamber V. Ultrasonic vibration processing is applied to the core wire bundle 13.

The side plate 32 is arranged on the side of the horn 31. The slide core 33 is arranged at a position facing the side plate 32 on the upper surface of the horn 31, and is movable in a direction of approaching or separating from the side plate 32. In FIG. 3, the slide core 33 moves in the direction indicated by the arrow A in the figure and presses the core wire bundle 13 in this direction. The anvil 34 is disposed above the horn 31 and the side plate 32, and can be moved in a direction in which the anvil 34 approaches or separates from the horn 31 by moving up and down. In FIG. 3, the anvil 34 moves in the direction indicated by the arrow B in the figure and presses the core wire bundle 13 in this direction.

The ultrasonic vibration device 30 moves the slide core 33 and the anvil 34 as described above to thereby cause the width and height of the bonding processing chamber V (and thus the cross-sectional area S2 of the processed core wire 13A to which the core wire bundle 13 is bonded). ) Can be adjusted. By adjusting the width and height of the joining processing chamber V in this manner, the core wire bundle 13 can be processed at a desired compression rate and the processed core wire 13A can be formed.

Here, as shown in FIG. 2, the ultrasonic vibration treatment is performed from the cross-sectional area S1 of the core wire bundle 13 before the ultrasonic vibration treatment with respect to the sectional area S1 of the core wire bundle 13 before the ultrasonic vibration treatment. The ratio ((S1−S2)/S1) of the value obtained by subtracting the cross-sectional area S2 of the subsequent core wire bundle 13 is defined as “compression ratio”. In this example, ultrasonic vibration processing is performed so that the compression rate is less than 10%.

The cross-sectional area S1 of the core wire bundle 13 may be the total of the cross-sectional areas of the individual conductor core wires 12, or a perfect circle when the cross section of the core wire bundle 13 is approximated to a specific shape (for example, a perfect circle). May be the area. Similarly, the cross-sectional area S2 of the processed core wire 13A may be the total of the cross-sectional areas of the individual conductor core wires 12 or a rectangle when the cross section of the core wire bundle 13 is approximated to a specific shape (for example, a rectangle). May be the area.

Next, referring to FIG. 1C again, regarding the crimping process of the post-processed core wire 13A and the terminal 20 performed after the ultrasonic vibration process, the terminal 20 has an electric connecting portion 21 and a crimping connecting portion 22. is doing. The terminal 20 is formed by pressing a metal plate made of a conductive metal material such as copper or a copper alloy.

The electric connecting portion 21 has a flat connecting plate portion 23, and the connecting plate portion 23 is formed with a connecting hole 23a. The connection plate portion 23 is electrically connected to the terminal block by, for example, inserting a fastening bolt through the connection hole 23a and fastening the connection bolt to a terminal block of the connection device.

The crimp connection part 22 has a conductor crimp part 24 and an outer cover crimp part 25 in order from the electric connection part 21 side. The conductor crimping portion 24 has a base portion 26 and a pair of conductor crimping pieces 27 (crimping pieces) formed on both sides of the base portion 26. The processed core wire 13A is placed on the base portion 26. The conductor crimping piece 27 is extended from the base portion 26 so as to sandwich the processed core wire 13A. As shown in FIG. 1D, the conductor crimping portion 24 is crimped to the processed core wire 13A of the electric wire 10 by bending (crimping) the pair of conductor crimping pieces 27 inward. As a result, the terminal 20 is conductively connected to the core wire bundle 13 of the electric wire 10.

The outer cover crimping portion 25 has a base portion 28 and a pair of outer cover crimping pieces 29 formed on both sides of the base portion 28. The base portion 28 of the outer cover crimping portion 25 extends from the base portion 26 of the conductor crimping portion 24. The insulating coating 11 of the electric wire 10 is placed on the base portion 28. The outer cover crimping piece 29 extends from the base portion 28 so as to sandwich the insulating coating 11 portion of the electric wire 10. As shown in FIG. 1D, the outer cover crimping portion 25 is crimped to the portion of the insulating coating 11 of the electric wire 10 by curving (crimping) the pair of outer cover crimping pieces 29 inward. It will be fixed.

The crimping treatment between the post-treatment core wire 13A and the terminal 20 described above can be performed using a general terminal crimping device (anvil 40, crimper 50) as shown in FIG. As shown in FIG. 4, the anvil 40 is arranged below the terminal 20 and the processed core wire 13A, and the crimper 50 is arranged above the terminal 20 and the processed core wire 13A. The crimper 50 is vertically movable relative to the anvil 40.

The anvil 40 has a support surface 41 at the top thereof that is curved so as to be recessed downward. When the terminal 20 is crimped, the supporting surface 41 supports the base portion 26 of the terminal 20. Specifically, the outer surface of the base portion 26 of the terminal 20 contacts the support surface 41. The crimper 50 is provided with an arch groove 52 having a chevron-shaped portion 51 protruding toward the anvil 40 side in the center portion in the width direction. The arch groove 52 is composed of two arc surfaces formed on both sides of the chevron portion 51. Then, when the crimper 50 is lowered and brought close to the anvil 40, the conductor crimping pieces 27 of the terminal 20 are pressed by the arch grooves 52 in a direction in which they are close to each other and are deformed so as to be curved (rolled) inward, and the core wire after processing 13A will be crimped. Note that, similarly to the above, by lowering the crimper (not shown) for the outer cover crimping piece 29, the outer cover crimping piece 29 is crimped to the insulating coating 11.

<Evaluation>
The inventor conducted a test for examining the effect of the ultrasonic vibration treatment described above.

(For aluminum wires)
Specifically, a sample that was not subjected to ultrasonic vibration treatment and a plurality of samples that were subjected to ultrasonic vibration treatment by varying the energy exerted on the core bundle 13 were prepared. A core wire bundle 13 (that is, an aluminum electric wire; diameter: 2.0 sq) in which a plurality of conductor core wires 12 made of aluminum are bundled is used for these samples. Each sample was subjected to ultrasonic vibration treatment using various energies adjusted by changing the vibration time, amplitude, frequency, etc. by the horn 31 of the ultrasonic vibration device 30.

The result is shown in FIG. In FIG. 5, the horizontal axis shows the energy exerted on the core wire bundle 13 during ultrasonic vibration treatment, and the vertical axis shows the maximum stress when a tensile test is performed on the treated core wire 13A after ultrasonic vibration treatment. ing. The maximum stress represents the stress at break of the treated core wire 13A when a tensile test is performed so as to pull the treated core wire 13A subjected to ultrasonic vibration treatment in the axial direction at a pulling speed of 50 mm/min. ..

According to this test, as shown in FIG. 5, as the energy exerted on the core wire bundle 13 in the ultrasonic vibration treatment increases, the maximum stress in the tensile test of the treated core wire 13A changes along a predetermined characteristic curve. It became clear. Specifically, this characteristic curve shows a local minimum value σB smaller than the maximum stress σ0 of the sample not subjected to ultrasonic vibration treatment (“no treatment” in the graph) as the energy exerted on the core wire bundle 13 increases. After that, it has a shape that reaches a maximum value σP larger than the maximum stress σ0 of the sample that is not subjected to ultrasonic vibration treatment.

Therefore, by obtaining such a characteristic curve in advance for the aluminum electric wire, for example, by setting the energy applied to the core wire bundle 13 to a value of E1 or more and E2 or less shown in FIG. 5, ultrasonic vibration processing is performed. The maximum stress of the treated sample can be controlled to have a maximum stress of 1.1σ0 that is 10% greater than the maximum stress of the non-sample. Practically, from the viewpoint of improving the tensile strength at the portion where the terminal 20 is crimped to the post-treatment core wire 13A, the tensile strength of the post-treatment core wire 13A is higher than that of the pre-treatment core wire bundle 13 (that is, the maximum stress). Is preferably increased by 10% or more.

As a result of similar tests performed on a plurality of types of aluminum electric wires having different diameters, it has been revealed that the shapes of characteristic curves are similar. In other words, it has been clarified that the shape of the characteristic curve is determined based on the material forming the core wire bundle 13.

(For copper wire)
Further, FIG. 6 shows the same evaluation result for the electric wire 10 made of another material. Specifically, for a core wire bundle 13 in which a plurality of copper conductor core wires 12 are bundled (that is, a copper electric wire. Diameter: 1.25 sq), a sample that is not subjected to ultrasonic vibration treatment and energy exerted on the core wire bundle 13 are A plurality of samples subjected to ultrasonic vibration treatment with various changes were prepared.

As shown in FIG. 6, it is apparent that the maximum stress in the tensile test of the treated core wire 13A changes along a predetermined characteristic curve as the energy applied to the core wire bundle 13 by the ultrasonic vibration treatment increases. became. The shape of this characteristic curve is different from the shape of the characteristic curve in the aluminum electric wire shown in FIG. Specifically, this characteristic curve has a first maximum value larger than the maximum stress σ0 of the sample not subjected to ultrasonic vibration treatment (“no treatment” in the graph) as the energy applied to the core wire bundle 13 increases. After passing through the value σP1 and a local minimum value σB that is smaller than the maximum stress σ0 of the sample that is not subjected to the ultrasonic vibration treatment, a second local maximum value σP2 that is larger than the maximum stress σ0 of the sample that is not subjected to the ultrasonic vibration processing is passed. It has an all-round shape.

Therefore, by acquiring such a characteristic curve in advance for the copper electric wire, for example, the energy exerted on the core wire bundle 13 is set to a value of E1 or more and E2 or less or a value of E3 or more and E4 or less shown in FIG. By doing so, the maximum stress of the sample after the treatment can be controlled so that the maximum stress 1.1σ0 is 10% larger than the maximum stress σ0 of the sample not subjected to the ultrasonic vibration treatment. As a result of performing the same test on a plurality of types of copper electric wires having different diameters, it has been clarified that the shapes of characteristic curves are similar. This point is the same as the case of the aluminum electric wire described above.

By the way, the principle of improving the tensile strength of the treated core wire 13A by subjecting the core wire bundle 13 to ultrasonic vibration treatment is currently under study. As one example of the assumed principle, it is considered that the ultrasonic vibration process causes the crystal orientation of the conductor core 12 to transition from a random state to a state having a predetermined regularity due to the ultrasonic vibration. Specifically, it is considered that, for example, the crystal orientations are aligned so as to have regularity suitable for improving the tensile strength, so that the tensile strength of the treated core wire 13A is improved.

<Action/effect>
As described above, according to the method for manufacturing the electric wire with a terminal 1 according to the embodiment of the present invention, the ultrasonic vibration treatment is performed on the conductor core wire before the terminals are crimped. This ultrasonic vibration treatment is performed so that the tensile strength of the conductor core wire after the treatment is higher than the tensile strength of the conductor core wire before the treatment. According to experiments conducted by the inventor, the processing time of ultrasonic vibration processing, the amplitude and frequency of ultrasonic vibration, etc. are determined based on the thickness and material of the conductor core wire, and the number of conductor core wires. It has been clarified that the tensile strength of the conductor core wire can be improved by adjusting. Therefore, according to the manufacturing method of this configuration, it is possible to manufacture an electric wire with a terminal having excellent tensile strength at a portion where the terminal is crimped to the conductor core wire.

Further, based on a characteristic curve obtained based on an experiment conducted in advance, it is possible to understand how much energy should be applied to the conductor core wire to improve the tensile strength of the conductor core wire. Further, in practice, the tensile strength of the conductor core wire after the treatment is increased by 10% or more as compared with the tensile strength of the conductor core wire before the treatment, so that the tensile strength at the portion where the terminal is crimped to the conductor core wire can be appropriately improved.

Furthermore, the ultrasonic vibration treatment is performed so that the compressibility related to the cross-sectional area of the conductor core wire before and after the treatment is less than 10%. Therefore, the cross-sectional area of the conductor core wire is not significantly reduced before and after the treatment. As a result, even if the terminal is crimped to the conductor core wire after the ultrasonic vibration treatment, the cross-sectional area of the conductor core wire does not become excessively small, and the resistance of the electric wire with a terminal against external force exerted on the electric wire can be improved.

<Other aspects>
The present invention is not limited to the above-mentioned embodiments, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the above-described embodiments, and can be modified, improved, and the like as appropriate. In addition, the materials, shapes, dimensions, numbers, locations, etc. of the respective constituent elements in the above-described embodiments are arbitrary and are not limited as long as the present invention can be achieved.

For example, the electric wire to which the manufacturing method of the present invention is applied may be an electric wire (aluminum electric wire) having a conductor core made of aluminum or aluminum alloy, or an electric wire having a conductor core made of copper or copper alloy (conductive Line).

Here, the features of the method for manufacturing an electric wire with a terminal according to the present invention described above will be briefly summarized and listed below in [1] to [4].
[1]
A method of manufacturing an electric wire with a terminal, in which a terminal (20) is crimped to a conductor core wire (12) of an electric wire (10),
In the step of subjecting the conductor core wire (12) to ultrasonic vibration treatment, the tensile strength of the conductor core wire (12) is higher than the tensile strength of the conductor core wire (12) before the ultrasonic vibration treatment. A step of applying the ultrasonic vibration treatment so as to increase;
Crimping the terminal (20) to the conductor core wire (12) that has been subjected to the ultrasonic vibration treatment.
Manufacturing method of electric wire with terminal.
[2]
In the method of manufacturing an electric wire with a terminal according to the above [1],
The ultrasonic vibration treatment,
The tensile strength of the conductor core wire (12) after the ultrasonic vibration treatment is 10% or more higher than the tensile strength of the conductor core wire (12) before the ultrasonic vibration treatment.
Manufacturing method of electric wire with terminal.
[3]
In the method of manufacturing an electric wire with a terminal according to the above [1] or the above [2],
The ultrasonic vibration treatment,
After performing the ultrasonic vibration treatment from the cross-sectional area S1 of the conductor core wire (12) before performing the ultrasonic vibration treatment to the sectional area S1 of the conductor core wire (12) before performing the ultrasonic vibration treatment When the ratio ((S1-S2)/S1) of the value obtained by subtracting the cross-sectional area S2 of the conductor core wire (12) is defined as the compression rate, the compression rate is less than 10%.
Manufacturing method of electric wire with terminal.
[4]
In the method for manufacturing the electric wire (10) with a terminal (20) according to any one of the above [1] to [3],
The conductor core wire (12) is
Composed of aluminum or aluminum alloy,
Manufacturing method of electric wire with terminal.

1 Electric wire with terminal 10 Electric wire 12 Conductor core wire 13 Core wire bundle 13A Processed core wire 20 Terminal

Claims (4)

A method for manufacturing an electric wire with a terminal in which a terminal is crimped to a conductor core wire of an electric wire,
In the step of subjecting the conductor core wire to ultrasonic vibration treatment, the ultrasonic vibration treatment is performed so that the tensile strength of the conductor core wire is higher than the tensile strength of the conductor core wire before the ultrasonic vibration treatment. The process of applying
Crimping the terminal to the conductor core wire subjected to the ultrasonic vibration treatment,
Manufacturing method of electric wire with terminal. The method for manufacturing an electric wire with a terminal according to claim 1,
The ultrasonic vibration treatment,
The tensile strength of the conductor core wire after the ultrasonic vibration treatment is 10% or more higher than the tensile strength of the conductor core wire before the ultrasonic vibration treatment.
Manufacturing method of electric wire with terminal. The method for manufacturing an electric wire with a terminal according to claim 1 or 2,
The ultrasonic vibration treatment,
With respect to the cross-sectional area S1 of the conductor core wire before the ultrasonic vibration treatment, the cross-section area S1 of the conductor core wire before the ultrasonic vibration treatment cuts off the conductor core wire after the ultrasonic vibration treatment. When the ratio of the value obtained by subtracting the area S2 ((S1−S2)/S1) is defined as the compression rate, the compression rate is less than 10%.
Manufacturing method of electric wire with terminal. The method for manufacturing an electric wire with a terminal according to any one of claims 1 to 3,
The conductor core wire is
Composed of aluminum or aluminum alloy,
Manufacturing method of electric wire with terminal.

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