Covered electric wire and electric wire with terminal
阅读说明：本技术 包覆电线及附带端子的电线 (Covered electric wire and electric wire with terminal ) 是由 小林启之 坂本慧 于 2018-07-04 设计创作，主要内容包括：一种包覆电线,具备导体和将所述导体的外周覆盖的绝缘包覆层,其中,所述导体是将由铜合金构成的多根线材进行了同心绞合而成的绞合线,所述铜合金含有总计为0.01质量％以上且5.5质量％以下的选自Fe、Ti、Mg、Sn、Ag、Ni、In、Zn、Cr、Al及P中的一种或两种以上的元素,剩余部分由Cu及不可避免的杂质构成,在所述绞合线的中心部配置的中心线材的表面的油附着量相对于所述中心线材的质量为10μg/g以下。(A coated electric wire comprising a conductor and an insulating coating layer covering the outer periphery of the conductor, wherein the conductor is a stranded wire obtained by concentrically stranding a plurality of wires made of a copper alloy, the copper alloy contains 0.01 to 5.5 mass% In total of one or two or more elements selected from the group consisting of Fe, Ti, Mg, Sn, Ag, Ni, In, Zn, Cr, Al and P, the remainder is made of Cu and unavoidable impurities, and the amount of oil adhering to the surface of a center wire disposed In the center of the stranded wire is 10 [ mu ] g/g or less relative to the mass of the center wire.)
1. A coated electric wire comprising a conductor and an insulating coating layer covering the outer periphery of the conductor,
the conductor is a stranded wire formed by concentrically twisting a plurality of wires made of copper alloy,
the copper alloy contains 0.01 to 5.5 mass% In total of one or more elements selected from the group consisting of Fe, Ti, Mg, Sn, Ag, Ni, In, Zn, Cr, Al and P, and the balance of Cu and unavoidable impurities,
the amount of oil adhering to the surface of the center wire disposed in the center of the strand is 10 [ mu ] g/g or less relative to the mass of the center wire.
2. The covered electric wire according to claim 1,
the surface of the wire rod is provided with a coating film made of copper oxide,
the thickness of the coating is 10nm or less.
3. The covered electric wire according to claim 1 or 2,
the tensile strength of the conductor is more than 450MPa, and the elongation at break is more than 5%.
4. The coated electric wire according to any one of claims 1 to 3,
the cross-sectional area of the conductor is 0.22mm2In the following, the following description is given,
the strand pitch of the strand is 12mm or more.
5. The covered electric wire according to any one of claims 1 to 4,
the minimum distance from a crown portion of the outer peripheral surface of each outer peripheral wire rod arranged at the outermost side of the twisted wire rod, excluding the twisting groove, to the outer peripheral surface of the insulating coating layer is set as the thickness of the insulating coating layer, and the ratio of the minimum value of the thickness to the maximum value of the thickness is 80% or more.
6. A terminal-equipped electric wire is provided with:
the coated electric wire according to any one of claims 1 to 5; and
and a terminal portion attached to an end of the covered electric wire.
7. The terminal-equipped electric wire according to claim 6,
the ratio of the cross-sectional area of the compressed portion of the conductor to which the terminal portion is attached to the cross-sectional area of the uncompressed portion to which the terminal portion is not attached is set as a remaining area ratio, and the remaining area ratio exceeds 0.76.
Technical Field
The present disclosure relates to a covered electric wire and an electric wire with a terminal.
The present application claims priority based on Japanese application laid-open at 2017, month 07, and 14, and incorporates the entire contents of the Japanese application.
Background
Prior art documents
Patent document
Patent document 1: japanese laid-open patent publication No. 2015-086452
Patent document 2: japanese patent laid-open publication No. 2012-146431
Disclosure of Invention
The disclosed coated electric wire is provided with a conductor and an insulating coating layer covering the outer periphery of the conductor, wherein,
the conductor is a stranded wire formed by concentrically twisting a plurality of wires made of copper alloy,
the copper alloy contains 0.01 to 5.5 mass% In total of one or more elements selected from the group consisting of Fe, Ti, Mg, Sn, Ag, Ni, In, Zn, Cr, Al and P, and the balance of Cu and unavoidable impurities,
the amount of oil adhering to the surface of the center wire disposed in the center of the strand is 10 [ mu ] g/g or less relative to the mass of the center wire.
The disclosed terminal-equipped wire is provided with:
the covered electric wire of the present disclosure described above; and
and a terminal portion attached to an end of the covered electric wire.
Drawings
Fig. 1 is a schematic perspective view showing an example of a coated electric wire according to the embodiment.
Fig. 2 is a schematic front view schematically showing an example of an end surface of a coated electric wire according to the embodiment.
Fig. 3 is a schematic side view showing the vicinity of a terminal portion of the terminal-equipped wire according to the embodiment.
Fig. 4 is an explanatory view explaining a method of measuring the thickness of the oxide film in test example 1.
Fig. 5 is an explanatory diagram for explaining a method of measuring a pitch of a stranded wire in relation to a stranded wire constituting a conductor provided in a coated electric wire.
FIG. 6 is a photomicrograph showing a cross-sectional view of the conductor of sample No.1-1, with a portion of the conductor enlarged, in Experimental example 1.
Detailed Description
[ problems to be solved by the present disclosure ]
As for the terminal-equipped electric wire included in the wire harness, a structure that is less likely to buckle is desired for a covered electric wire used by attaching a terminal portion to an end portion.
As described in
In addition, in the coated electric wire used with the terminal portion attached to the end portion as described above, it is desired to further reduce the contact resistance with the terminal portion.
Further, in the case where a branch wire or the like is welded to the covered electric wire used with the terminal portion attached to the end portion as described above, further improvement in welding strength (peeling force) is desired.
In particular, in the case of the concentrically stranded litz wire conductor such as the 7 strands described in
Therefore, an object of the present invention is to provide a covered electric wire and an electric wire with a terminal, which are less likely to be buckled.
[ Effect of the present disclosure ]
The covered electric wire of the present disclosure and the electric wire with a terminal of the present disclosure are difficult to buckle.
[ description of embodiments of the present disclosure ]
First, embodiments of the present disclosure will be described.
(1) A coated electric wire according to one aspect of the present disclosure includes a conductor and an insulating coating layer covering an outer periphery of the conductor,
the conductor is a stranded wire formed by concentrically twisting a plurality of wires made of copper alloy,
the copper alloy contains 0.01 to 5.5 mass% In total of one or more elements selected from the group consisting of Fe, Ti, Mg, Sn, Ag, Ni, In, Zn, Cr, Al and P, and the balance of Cu and unavoidable impurities,
the amount of oil adhering to the surface of the center wire disposed in the center of the strand is 10 [ mu ] g/g or less relative to the mass of the center wire.
The oil is typically mineral oil, synthetic oil, or the like, and is derived from a lubricant used in the production process (and may have a function other than a lubricating function such as a discoloration preventing function). The oil is typically a lubricant used in plastic working such as wire drawing.
The concentric twisting is a case where at least 1 wire is used as a center wire and a plurality of outer peripheral wires are concentrically twisted so as to cover the outer periphery of the center wire.
The stranded wire is a state in which a plurality of wire materials (here, copper alloy wires) are stranded, and includes a compressed stranded wire obtained by compression molding after stranding, in addition to an uncompressed stranded wire.
The above-described coated electric wire is a stranded wire obtained by concentrically twisting a conductor, but is difficult to buckle for the following reason. In the above-described coated electric wire, the oil adhered to the surface of the center wire constituting the litz wire is small. Here, when the conductor is a litz wire, typically, a wire manufactured under the same manufacturing conditions is used for each wire used for the litz wire. Therefore, if the amount of oil adhering to the surface of the center wire is small, the amount of oil adhering to the surface of each outer peripheral wire is small, and the amount of oil adhering to the surface of all the wires constituting the strand is small. Therefore, oil content between the wires and oil content between the outermost outer peripheral wire and the insulating coating layer constituting the conductor are reduced, and friction between the wires and friction between the outer peripheral wire and the insulating coating layer are likely to increase. The above-described coated electric wire having a stranded wire as a conductor has excellent rigidity because the wires of the coated electric wire and the conductor and the insulating coating layer are difficult to slide, and they are integrated and easily moved. In the case of a small cross-sectional area of the conductor, particularly 0.22mm2Below, further 0.2mm2Below, 0.15mm2In the following cases, the friction between the wires and the friction between the conductor and the insulating coating layer are large as described above, and therefore the rigidity is excellent. The coated electric wire is difficult to buckle because of the excellent rigidity of the whole coated electric wire. When such a coated electric wire is used as an electric wire with a terminal, the vicinity of the terminal portion is less likely to be buckled when the terminal portion is inserted into the terminal housing portion of the housing, and the insertion workability is excellent.
In addition, in the case where the terminal portion is attached to the end portion of the above-described covered electric wire, the contact resistance with the terminal portion is low. This is because the oil adhered to the surface of each wire constituting the conductor is usually an electrically insulating material, but in the coated electric wire, the oil is less as described above, and therefore the oil interposed between the conductor and the terminal portion is less. Here, even if the amount of oil adhering is increased to a certain degree, if the terminal portion is mounted with a large degree of compression, mutual friction between the wire rods occurs locally at the compressed portion of the terminal portion of the conductor to remove oil, and it is considered that the contact resistance is likely to be reduced. In contrast, since the coated electric wire has a small amount of oil adhering thereto, the contact resistance can be reduced even if the degree of compression is reduced. If the degree of compression is small, the ratio of the remaining area of the compressed portion of the terminal portion in the conductor can be increased, and the excellent characteristics of the non-compressed portion in the conductor can be maintained. For example, if the conductor has excellent impact resistance, the sectional area is small, particularly even 0.22mm2Below, further 0.2mm2Below, 0.15mm2In the following case, a terminal-equipped electric wire having excellent impact resistance can be constructed. When such a coated electric wire is used as an electric wire with a terminal, even when the cross-sectional area of the conductor is small as described above, and further when the degree of compression is smaller, the contact resistance is low, and the impact resistance is excellent.
In addition, the above-described coated electric wire is excellent in welding strength when a branch wire or the like is welded to a conductor composed of concentrically twisted strands. This is because, as described above, since the surface of each wire rod constituting the conductor is coated with a small amount of oil, it is difficult to generate a deteriorated substance or the like due to the oil at the time of welding, and it is difficult to reduce the strength due to the inclusion of the deteriorated substance in the welded portion.
(2) As an example of the above-described coated electric wire, the following method can be mentioned:
the surface of the wire rod is provided with a coating film made of copper oxide,
the thickness of the coating is 10nm or less.
The above-described method has a coating film made of copper oxide containing an electrically insulating material, but the coating film is very thin. Therefore, the above-described method is easy to further reduce the contact resistance with the terminal portion. In addition, the above-described method reduces a decrease in welding strength due to inclusion of copper oxide, and the welding strength is further excellent.
(3) As an example of the above-described coated electric wire, the following method can be mentioned:
the tensile strength of the conductor is more than 450MPa, and the elongation at break is more than 5%.
The above method is more difficult to buckle because of high tensile strength. Moreover, the welding strength of the above-described system is further excellent. In addition, the above embodiment has both high tensile strength and high elongation at break, and therefore has excellent impact resistance.
(4) As an example of the above-described coated electric wire, the following method can be mentioned:
the cross-sectional area of the conductor is 0.22mm2In the following, the following description is given,
the strand pitch of the strand is 12mm or more.
In the above-described method, the cross-sectional area of the conductor is small, but the strand pitch of the strand is long, and therefore, the strength is excellent, and buckling is more difficult.
(5) As an example of the above-described coated electric wire, the following method can be mentioned:
the minimum distance from a crown portion of the outer peripheral surface of each outer peripheral wire rod arranged at the outermost side of the twisted wire rod, excluding the twisting groove, to the outer peripheral surface of the insulating coating layer is set as the thickness of the insulating coating layer, and the ratio of the minimum value of the thickness to the maximum value of the thickness is 80% or more.
In this case, it can be said that the insulating coating layer is provided with a uniform thickness with respect to the conductor, and the rigidity due to integration of the conductor and the insulating coating layer is further increased, so that buckling is more difficult.
(6) An electric wire with a terminal according to an aspect of the present disclosure includes:
the coated electric wire according to any one of the above (1) to (5); and
and a terminal portion attached to an end of the covered electric wire.
The above-described electric wire with a terminal has the above-described coated electric wire in which the stranded wire having a small amount of oil adhered thereto is used as a conductor, and therefore, the electric wire with a terminal has the effects of being less likely to be buckled, having low contact resistance between the conductor and the terminal portion, and having excellent welding strength.
(7) Examples of the above-described terminal-equipped wire include the following:
the ratio of the cross-sectional area of the compressed portion of the conductor to which the terminal portion is attached to the cross-sectional area of the uncompressed portion to which the terminal portion is not attached is set as a remaining area ratio, and the remaining area ratio exceeds 0.76.
In the above-described aspect, although the conductor remaining area of the compressed portion of the terminal portion of the conductor is large, the contact resistance is low because the amount of oil adhering is small as described above. In addition, in the above-described aspect, since the remaining area of the conductor is large, the characteristics of the non-compressed portion of the conductor can be maintained, and the conductor is excellent in impact resistance, for example.
[ details of embodiments of the present disclosure ]
Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings as appropriate. In the drawings, the same reference numerals denote the same items. In the composition of the copper alloy, the content of the element is set as a mass ratio (mass% or mass ppm) unless otherwise specified.
[ covered electric wire ]
As shown in fig. 1, a coated
(conductor)
Each of the
The composition (1 precipitation + solid solution alloy) contains 0.2% to 2.5% of Fe, 0.01% to 1.0% of Ti, and 0.01% to 2.0% In total of 1 or 2 or more elements selected from Mg, Sn, Ag, Ni, In, Zn, Cr, Al, and P.
The composition (2 precipitation + solid solution alloy) contains 0.1% to 1.6% of Fe, 0.05% to 0.7% of P, and 0% to 0.7% of at least one element selected from Sn and Mg.
The composition (3 solid solution alloy) contains 0.15% to 0.7% of Sn.
The composition (4 solid solution alloy) contains 0.01% to 1.0% of Mg.
In the composition (1), the content of Fe may be 0.4% to 2.0%, further 0.5% to 1.5%,
the content of Ti is set to 0.1% to 0.7%, further 0.1% to 0.5%,
the content of Mg is set to 0.01% to 0.5%, further 0.01% to 0.2%,
the content of Sn is 0.01% to 0.7%, further 0.01% to 0.3%,
the content of Ag is 0.01% to 1.0%, more preferably 0.01% to 0.2%,
the total content of Ni, In, Zn, Cr, Al, and P is 0.01% to 0.3%, and further 0.01% to 0.2%.
In the composition (2), the content of Fe may be 0.2% to 1.5%, further 0.3% to 1.2%,
the content of P is 0.1% to 0.6%, further 0.11% to 0.5%,
the content of Mg is set to 0.01% to 0.5%, further 0.02% to 0.4%,
the content of Sn is 0.05% to 0.6%, and further 0.1% to 0.5%.
In the composition (3), the content of Sn may be 0.15% or more and 0.5% or less, and further 0.15% or more and 0.4% or less.
In the composition (4), the content of Mg may be 0.02% or more and 0.5% or less, and further 0.03% or more and 0.4% or less.
Further, 1 or 2 or more elements selected from C, Si and Mn may be contained in a total amount of 10ppm to 500 ppm. These elements can function as an antioxidant for the above-mentioned elements such as Fe and Sn.
< organization >
When the copper alloy constituting each
When the copper alloy has a structure including precipitates, it is found that the weld strength is easily improved if coarse precipitates are reduced to some extent. Quantitatively, the number of precipitates having a grain size of 1 μm or more is preferably 1mm or more in the observed image obtained by microscopic observation of a longitudinal section of the
< surface State >
Amount of oil adhered
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