JP3156381B2 - Wire conductor for crimp connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire conductor for use in automobile wiring, and more particularly to an electric wire conductor used by crimping terminals for connection.

[0002]

2. Description of the Related Art Conventionally, as a wiring wire for an automobile, a conductor is mainly composed of a soft copper wire specified in JIS C 3102 or a stranded wire obtained by twisting a wire plated with tin or the like. An electric wire in which an insulator such as vinyl chloride or cross-linked polyethylene is coated concentrically has been used.

[0003] In recent years, as the performance of automobiles has become higher, the number of wiring locations in automobiles has increased due to the increase in various control circuits and the like, and the reliability required for them has been further increased.

[0004] By the way, especially in an automobile wiring circuit, a ratio of a signal current circuit for control or the like is increasing, and the weight of an electric wire used is increasing.

On the other hand, from the standpoint of energy saving, it has been required to reduce the weight of automobiles. And
As one of the countermeasures, it is required to reduce the weight by reducing the diameter of the wire conductor.

However, in the conventional wire conductor, it is difficult to reduce the diameter of the wire conductor because the mechanical strength of the wire conductor itself and the terminal crimping portion thereof is weak even though the current carrying capacity has a sufficient margin.

[0007] In order to reduce the weight without reducing the diameter of the wire conductor, aluminum wire (including an alloy) of the wire conductor has been studied in part.

[0008]

However, aluminum is generally weak in strength, and to ensure sufficient strength, it is necessary to take measures such as increasing the outer diameter of the wire conductor or increasing the number of stranded wires. As a result, many insulators are used instead. As described above, even if the wire conductor is made of aluminum, a large wiring space is required, the effect of reducing the weight cannot be expected sufficiently, and there are many problems such as an increase in insulator cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and maintains wire strength and terminal crimping portion strength not inferior to those of conventional wire conductors, and reduces the weight by reducing the diameter. It is an object of the present invention to provide a wire conductor for crimping connection that can be formed.

[0010]

According to a first aspect of the present invention, there is provided a wire conductor for crimping connection comprising 1.5 to 4.0% by weight of Ni and
A plurality of wires each containing 0.4 to 0.6 % by weight of Si and the balance consisting essentially of copper were obtained by using conductors having a cross-sectional area of 0.03 to 0.3.
mm ² and the tensile strength is 45
kgf / mm ² or more 90 kgf / mm is less than ^2, and wherein the elongation at break is less than 20% 9% or more and conductivity at 20 ° C. is 50% or more. The wire conductor for crimp connection according to the first invention can be manufactured, for example, as follows. 1.5-
4.0 wt% Ni and 0.4-0.6 wt% Si
Is prepared, and a cast material is produced from the molten metal by casting. Further, after the manufactured cast material is cold forged in the next step, a solution treatment is performed at a predetermined temperature to manufacture a quenched material. The manufactured quenched material is drawn to a predetermined diameter size, and a plurality of drawn wires are twisted into a stranded wire. The stranded wire is heated at a predetermined temperature in a vacuum to perform aging treatment, and the wire conductor for crimp connection is connected.

At this time, the tensile strength of the wire conductor for crimping connection finally becomes 45 kgf / mm ² or more and less than 90 kgf / mm ² , the elongation at break becomes 9 % or more and less than 20%, and the conductivity at 20 ° C. It is desirable to appropriately adjust the diameter of the wire, the heat treatment conditions in the solution treatment, the degree of work in the aging treatment, the heat treatment conditions, and the like according to the alloy composition so that the rate becomes 50% or more.

According to a second aspect of the present invention, there is provided a wire conductor for crimping connection.
A plurality of elements comprising 1.5-4.0% by weight of Ni, 0.3-1.0% by weight of Si, and 0.1-1.0% by weight of Ag, with the balance consisting essentially of copper Wires with a conductor cross section of 0.
It by twisting so as to be 03～0.3Mm ^2, tensile strength is less than 45 kgf / mm ² or more 90 kgf / mm ^2, an elongation less than 20% more than 8% at break, and 20 ° C. Is characterized by having a conductivity of 53% or more.

According to a second aspect of the present invention, there is provided an electric wire conductor for crimping connection.
For example, it can be manufactured as follows. 1.
5 to 4.0 wt% Ni, 0.3 to 1.0 wt% Si
And a molten metal containing 0.1 to 1.0% by weight of Ag and the balance consisting essentially of copper is prepared, and a casting is produced from the molten metal by casting. Furthermore, after cold-forging the manufactured cast material in the next step, it is subjected to a solution treatment at a predetermined temperature,
Manufacture hardened materials. The manufactured quenched material is drawn to an intermediate diameter size, and the intermediate size wire is heated at a predetermined temperature and subjected to an intermediate aging treatment. By performing the intermediate aging treatment, it is possible to suppress a decrease in the wire strength of the wire conductor and the terminal crimping portion strength due to the addition of Ag. After the intermediate aging treatment, the wire is drawn again to a predetermined diameter size, and a plurality of drawn wires are twisted into a stranded wire. Thereafter, the stranded wire is subjected to a final aging treatment by heating it at a predetermined temperature in a vacuum to produce a wire conductor for crimp connection.

At this time, the tensile strength of the wire conductor for crimp connection is finally 45 kgf / mm ² or more and 90 kgf / mm ^2.
The diameter of the wire, the heat treatment conditions in the solution treatment, and the intermediate temperature are appropriately adjusted according to the alloy composition so that the elongation at break is 8% or more and less than 20% and the conductivity at 20 ° C. is 53% or more. It is desirable that the degree of work and the heat treatment conditions in the final aging treatment are adjusted.

[0015]

In the first invention, an alloy composition containing 1.5 to 4.0 % by weight of Ni and 0.4 to 0.6 % by weight of Si and the balance essentially consisting of copper is As shown in the following examples, the tensile strength of the conductor is 45 kgf / mm ²
Is less than 90 kgf / mm ² and the elongation at break is
This is because it has been found that the alloy composition is most suitable for realizing a wire conductor for crimping connection in which the electric conductivity at 9 ° C. is less than 20% and the electric conductivity at 20 ° C. is 50% or more.

Further, in the second invention, 1.5 to 4.
The alloy composition containing 0% by weight of Ni, 0.3 to 1.0% by weight of Si, and 0.1 to 1.0% by weight of Ag, with the balance consisting essentially of copper, was as follows: As shown in the examples, the tensile strength of the conductor is 45 kgf / mm ² or more and 90 k
gf / mm ² , and the elongation percentage of the conductor at break is 8%
This is because it has been found that the alloy composition is most suitable for realizing a wire conductor for crimping connection in which the electric conductivity at 20 ° C. is less than 20% and the electric conductivity at 20 ° C. is 53% or more.

In the present invention, the conductor cross section is 0.03 to 0.03.
The reason why the diameter is set to 0.3 mm ² is that the conductor cross-sectional area is 0.1 mm.
If it is less than 03Mm ² during processing of the harness, it is because the machining of crimping the terminal becomes difficult, and because the conductor cross-sectional area becomes Soguwanaku the purpose of weight reduction of it exceeds the 0.3 mm ² It is.

In the present invention, the reason that the tensile strength of the conductor is 45 kgf / mm ² or more and less than 90 kgf / mm ² is that the tensile strength of the conductor is 45 kgf / m 2.
If it is less than m ^2, it is because sufficient strength can not be obtained for use as an automotive wire case of smaller diameter, if the tensile strength of the conductor is 90 kgf / mm ² or more, conductors elongation Is 8% or more and less than 20%, and it is industrially very difficult to perform aging treatment so that the electrical conductivity at 20 ° C. becomes 50% or more.

Further, in the present invention, the elongation at break is set to be 8% or more and less than 20%, if the elongation of the conductor is less than 8%, it is necessary to use it as an electric wire for automobiles. This is because the wire strength and the terminal crimping portion strength against the applied shock cannot be obtained, and if the elongation percentage of the conductor is 20% or more, the tensile strength of the conductor becomes less than 45 kgf / mm ² .

As described above, in the wire conductor for crimping connection of the present invention, by setting the tensile strength of the conductor to 45 kgf / mm ² or more and less than 90 kgf / mm ² , it is necessary to use it as an automobile wire. By providing sufficient strength and elongation at break of 8% or more and less than 20%, desired wire strength and terminal crimping portion strength are provided. Further, by setting the conductivity of the conductor at 20 ° C. to 50% or more, it is possible to secure electrical characteristics required for use as an automobile electric wire.

In the present invention, since the Ni--Si--Cu alloy is an aging alloy as is well known, it is 1.5 to 4.0.
In an alloy composition containing 2.5 % by weight of Ni and 0.4 to 0.6 % by weight of Si, with the balance being essentially copper, by appropriately adjusting the workability and heat treatment conditions in the aging treatment, the desired mechanical properties can be obtained. An electric wire conductor for crimp connection having both characteristics and electrical characteristics can be obtained.

Further, in the wire conductor for crimp connection according to the second invention, in particular, 1.5 to 4.0% by weight of Ni, 0.3% by weight.
0.1 to 1.0% by weight in addition to 1.0 to 1.0% by weight of Si
By containing Ag, the tensile strength of the conductor can be further enhanced without lowering the electrical conductivity of the electric wire conductor. Further, by performing the intermediate aging treatment, it is possible to obtain a wire conductor for crimp connection in which electrical characteristics are maintained at a high level and mechanical properties such as the strength of the wire against impact and the strength of the terminal crimp portion are further improved.

[0023]

【Example】

Example 1 Ni—Si—Cu having a composition shown by weight% in the table of FIG.
The alloy was melted and cast to form an ingot. After cold forging to a diameter of 16 mm, a solution treatment was performed by heating at 950 ° C. for 2 hours, and quenching in water was performed. The quenched material thus obtained was drawn to a predetermined diameter size to prepare a strand. Thereafter, seven strands were twisted into a stranded wire, and the stranded wire was heated at 460 ° C. for 2 hours in a vacuum to perform aging treatment, thereby producing a prototype wire conductor as shown in FIG.

In the table of FIG. 3, the wire conductors made of the Ni--Si--Cu alloy having the composition according to the present invention are shown in Examples 1 to 8 of the present invention, and the electric wires made of the Ni--Si--Cu alloy having the other compositions. The conductors are shown in Comparative Examples 1 to 4.
For comparison, a conventional example using soft copper conventionally used as an automobile electric wire is shown.

Conductor cross-sectional area, weight, conductor tensile strength, stranded elongation at break, conductivity at 20 ° C., electric wire impact value, and terminal impact value were measured for all electric wire conductors. Are shown in the table of FIG.

From the results shown in FIG. 3, the wire conductors according to Examples 1 to 8 of the present invention are smaller in diameter than the wire conductors according to the conventional example and Comparative Examples 1 to 4 despite having a smaller diameter. Values and terminal part impact values are large, and it can be seen that they have excellent electric wire strength and terminal part crimping strength.

Further, in the wire conductors according to Examples 1 to 8 of the present invention, while the electrical conductivity is maintained at 50% or more, the tensile strength of the conductor is greatly enhanced as compared with the wire conductor according to the conventional example. As described above, the wire conductors according to Examples 1 to 8 of the present invention are lighter in weight than the wire conductors according to the comparative examples, and the mechanical properties are significantly improved.

Example 2 Since the Ni-Si-Cu alloy according to the present invention is an aging alloy as is well known, the mechanical properties and the electrical characteristics of the electric wire conductor can be improved by changing the workability and the heat treatment conditions in the aging treatment even with the same composition. The electrical characteristics change.

Therefore, in Example 2, in order to see the effects of the working degree and the heat treatment conditions in the aging treatment, the following were used.
4% Ni and 0.6% Si by weight, with the balance being C
An electric wire conductor tempered to have different characteristics using an alloy made of u was manufactured as a trial.

Conductor cross-sectional area, weight, conductor tensile strength, stranded elongation at break, conductivity at 20 ° C., electric wire impact value, and terminal impact value were measured for all electric wire conductors. Are shown in the table of FIG.

In the table of FIG. 4, the tensile strength of the conductor is 45 kgf / mm ² or more and less than 90 kgf / mm ² , the elongation at break is 8% or more and less than 20%, and the conductivity is 50% or less. The wire conductors described above are shown as Examples 1 to 3 of the present invention, and the other wire conductors are shown as Comparative Examples 1 and 2.

The electric wire conductor according to Example 1 of the present invention was produced in the same process as in Example 1, and was obtained by setting the temperature of the final aging treatment performed by stranded wire to 460 ° C.

The wire conductor according to Example 2 of the present invention was manufactured in the same process as in Example 1 up to the stranded wire, and was obtained by changing the temperature of the final aging treatment performed on the stranded wire to 420 ° C. . Further, the wire conductor according to Example 3 of the present invention was manufactured in the same process as in Example 1 up to the stranded wire, and was obtained by changing the temperature of the final aging treatment performed on the stranded wire to 500 ° C.

As is clear from the results shown in FIG. 4, even in a wire conductor made of an alloy having the same composition, the tensile strength of the conductor, the stranded wire elongation at break, Rate, wire impact value, and terminal portion impact value are different, and although the weight is reduced in the wire conductors according to Comparative Examples 1 and 2, the wire impact value and the terminal portion impact value are kept as low as the conventional wire conductor. Have been.

On the other hand, the wire conductors according to Examples 1 to 3 of the present invention have a tensile strength of 45 kgf / mm ² or more and 90 kF or more.
gf / mm ² and the elongation at break is 8% or more and 20% or less.
%, A larger wire impact value and a terminal portion impact value are obtained, and it can be seen that the wire has excellent wire strength and terminal crimping portion strength.

Example 3 Next, to see the effect of adding Ag to the conductor material,
Using an alloy containing 2.4 wt% Ni and 0.6 wt% Si and the balance being Cu, a wire conductor was prototyped by changing the addition amount of Ag as shown in Table 3. The manufacturing conditions (working degree and heat treatment conditions in the aging treatment) during the production of the wire conductor were the same as those in Example 1.

With respect to all the wire conductors of Examples 1 to 4 of the present invention shown in the table of FIG. 5, the tensile strength of the conductor, the elongation of the stranded wire at break, the conductivity, the wire impact value, and the terminal impact value Was measured, and the results are shown in the table.

It can be seen from the results shown in FIG.
In the wire conductors according to Inventive Examples 1 to 3 to which Ag is added, although the wire impact value or the terminal impact value is slightly smaller than that of Inventive Example 4 to which Ag is not added, the tensile strength of the conductor is further enhanced. I have.

In addition, in the wire conductors according to Examples 1 to 3 of the present invention, the addition of Ag enhances the tensile strength of the conductor, while the conductivity is in accordance with Example 4 of the present invention in which Ag is not added. It is kept as high as the wire conductor. As described above, by adding a small amount of Ag, it is possible to obtain a wire conductor with improved mechanical properties as compared with the conventional one while maintaining good electrical properties.

Example 4 The electric wire conductor in Example 3 was manufactured under the same manufacturing conditions as in Example 1, and Example 1 of the present invention containing Ag was added.
In the conductors of Nos. 1 to 3, the electric wire impact value and the terminal portion impact value tended to slightly decrease with an increase in the amount of Ag added, as compared with the electric wire conductor of Inventive Example 4 in which Ag was not added.

Therefore, in order to see the effect of the addition of Ag to the conductor material when the working ratio and the heat treatment conditions in the aging treatment were changed, an alloy having the same composition as in Example 3 was used, as shown in the table of FIG. A wire conductor was prototyped by changing the amount of Ag added.

The manufacturing conditions at the time of producing the electric wire conductor were as follows. A Ni-Si-Cu alloy to which Ag was added in an amount shown in Table 4 by weight% was melted and cast to obtain an ingot. After cold forging the ingot to a diameter of 16 mm, a solution treatment was performed. The solution treatment was performed at 950 ° C. for 2 hours, followed by quenching in water. The quenched material thus obtained was first drawn to a diameter of 0.9 mm,
An intermediate aging treatment was performed by heating the intermediate-sized wire at 450 ° C. for 2 hours. After that, 0.18 again
The wire was drawn to a diameter of mm, and seven drawn wires were stranded to form a stranded wire. This stranded wire was subjected to final aging treatment by heating at 460 ° C. for 2 hours in a vacuum, and a wire conductor was prototyped.

In the table of FIG. 6, the wire conductors obtained as described above are shown in Examples 1 to 3 of the present invention. For comparison, an electric wire conductor to which Ag was not added is shown in Example 4 of the present invention under the same manufacturing conditions as in Example 1.

As is evident from the results shown in FIG. 6, Examples 1 to 5 of the present invention in which Ag was added by performing an intermediate aging treatment.
The wire impact value and the terminal portion impact value of the wire conductor according to
It is improved to the level of or higher than that of the wire conductor according to Example 4 of the present invention without adding Ag. As described above, by adding Ag, and further changing the degree of work and the heat treatment conditions in the aging treatment, a wire conductor that maintains high electrical conductivity and further enhances tensile strength, wire strength, and terminal crimping portion strength Can be obtained.

In the wire conductors according to Examples 1 to 4, the tensile strength, electrical conductivity, wire impact value, and terminal portion impact value are improved, so that the wire conductor can be sufficiently used instead of the conventional soft copper stranded wire. A possible electric wire (see FIG. 2) can be provided.

[0046]

As described above, in the wire conductor for crimping connection according to the present invention, the strength of the wire and the strength of the terminal crimping portion are enhanced, thereby reducing the weight of the wire by reducing the diameter of the conductor. Can be.

By using the wire conductor for crimping connection according to the present invention, not only the weight of the wire can be reduced, but also a wire that is hard to be broken by an impact load on the wire and the terminal crimp portion can be easily provided.

In addition, the mechanical properties of the wire conductor for crimping connection according to the present invention are further enhanced by adding Ag without deteriorating the electrical properties. Therefore,
By using the wire conductor for crimping connection of the present invention, it is possible to provide an automobile electric wire that can withstand a severe use environment such as an automobile assembling process.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electric wire conductor according to the present embodiment.

FIG. 2 is a sectional view of an electric wire obtained by insulatingly coating the electric wire conductor shown in FIG.

FIG. 3 is a diagram showing, in a table form, a component configuration of a wire conductor of Example 1 and performance characteristics corresponding thereto.

FIG. 4 is a diagram showing, in a table form, a component configuration of a wire conductor of Example 2 and performance characteristics corresponding thereto.

FIG. 5 is a diagram showing, in a tabular form, a component configuration of a wire conductor of Example 3 and performance characteristics corresponding thereto.

FIG. 6 is a diagram showing, in a table form, a component configuration of a wire conductor of Example 4 and performance characteristics corresponding thereto.

[Explanation of symbols]

 1 electric wire conductor 2 strand

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhiro Nanjo 1-3-1 Shimaya, Konohana-ku, Osaka Sumitomo Electric Industries, Ltd. Osaka Works (56) References JP-A-3-162539 (JP, A) Kaihei 1-168832 (JP, A) Japanese Utility Model Showa 58-133215 (JP, U) JP-B 60-30043 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01B 5 / 00-5/16 C22C 9/00-9/10 H01B 1/02

Claims (2)

(57) [Claims] 1. 1.5 to 4.0% by weight of Ni and 0.1% by weight .
A plurality of wires each containing 4 to 0.6 % by weight of Si and the balance being essentially made of copper, having a conductor cross-sectional area of 0.03 to 0.3 mm
Twisted to make ² and the tensile strength is 45kg
a wire conductor for crimp connection, having an elongation at break of 9 % or more and less than 20% and an electrical conductivity at 20 ° C. of 50% or more, which is f / mm ² or more and less than 90 kgf / mm ^2. . 2. 1.5% to 4.0% by weight of Ni, 0.3% to
1.0 wt% Si, and 0.1-1.0 wt% A
comprises g, a plurality of wires and the balance being essentially copper, the conductor cross-sectional area is by twisting so as to be 0.03 to 0.3 mm ^2, a tensile strength of 45 kgf / mm ² or more 90k
gf / mm ² , and the elongation at break is 8% or more 2
An electric wire conductor for crimping connection, wherein the electric conductivity is less than 0% and the electric conductivity at 20 ° C. is 53% or more.