Classifications

• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C9/00—Alloys based on copper
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C9/00—Alloys based on copper
  • C22C9/02—Alloys based on copper with tin as the next major constituent
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C9/00—Alloys based on copper
  • C22C9/04—Alloys based on copper with zinc as the next major constituent
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
  • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
  • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
  • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
  • H01B5/08—Several wires or the like stranded in the form of a rope
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49117—Conductor or circuit manufacturing

Definitions

• the present invention relates to a wire conductor for wiring such as an electric / electronic device and a wiring wire using the same.
• stranded wires are mainly twisted together with an electrical soft copper wire stipulated in JIS C 3102 or a plated wire with tin plating applied thereto.
• an electric wire (covered electric wire) in which an insulator such as vinyl chloride or crosslinked polyethylene is coated on the stranded wire has been used.
• crimp terminals When connecting these wires to equipment, usually, terminals called crimp terminals are crimped to the wires, and crimp terminals connected to the wires are connected to the equipment.
• the crimping connection is a method in which an electric wire is wrapped (or sandwiched) with a terminal material and caulked to be connected.
• the crimped section has a conductor cross-sectional area that is 20-30% smaller than that before caulking (hereinafter referred to as the ratio of reduction in the cross-sectional area of the conductor due to caulking). The absolute value of intensity is decreasing. For this reason, the fracture usually occurs at the caulked portion.
• JP 2008-016284 A Japanese Patent Laid-Open No. 3-162539 JP 2008-266664 A JP 2008-088549 A
• the wire conductor of an aging precipitation type copper alloy (Corson alloy) described in Patent Document 2 has a high elongation rate and excellent crimp strength and impact strength, and can be used for a signal circuit wire, but a fuse circuit is used. There is a problem that the electrical conductivity is low when used for electric power cables.
• Patent Document 3 describes quenching at a high temperature when obtaining a copper alloy rough drawn wire by a continuous casting rolling method, and Patent Document 4 describes aging heat treatment of the copper alloy wire. In order to further improve the characteristics of the electric wire conductor, detailed examinations are required for technical matters other than those described in Patent Documents 3 to 4.
• the present invention relates to a wire conductor for wiring having high conductivity that can be used for, for example, power wires in automobiles, high strength and elongation, and excellent terminal crimp strength, impact breaking strength, and flexibility, and wiring thereof It is an object of the present invention to provide a method for manufacturing a wire conductor for a vehicle.
• an aging precipitation type copper alloy having a specific composition can be used to produce a copper alloy wire that solves the above-described problems, and further, as a wire conductor for wiring in which this is twisted together
• the ratio of 0.2% proof stress to tensile strength is 0.7 to 0.95
• the work hardening index is 0.03 to 0.17
• the processing rate after solution treatment is set to an appropriate condition.
• the above-described wiring conductor can be obtained with good reproducibility by aging annealing (heat treatment) performed in the final step.
• a wire conductor for wiring comprising 0.3 to 1.5% by mass of Cr, the balance being a plurality of copper alloy wires having a composition consisting of Cu and inevitable impurities, and having a tensile strength 400 MPa or more and 650 MPa or less, elongation at break of 7% or more, conductivity of 65% IACS or more, 0.2% proof stress to tensile strength ratio of 0.7 or more and 0.95 or less, and work hardening index is It is 0.03 or more and 0.17 or less,
• the electric wire conductor for wiring characterized by the above-mentioned.
• a plurality of copper alloy wires having a composition of 0.3 to 1.5% by mass of Cr and 0.005 to 0.4% by mass of Zr and the balance of Cu and inevitable impurities are twisted together.
• a wire conductor for wiring having a tensile strength of 400 MPa to 650 MPa, an elongation at break of 7% or more, an electrical conductivity of 65% IACS or more, and a ratio of 0.2% proof stress to tensile strength of 0.7%.
• the composition of the copper alloy wire is 0.1 to 0.6 mass% of Sn, 0.005 to 0.3 mass% of Ag, 0.05 to 0.4 mass% of Mg, and 0 of In. (1) or (2), further comprising at least one selected from the group consisting of 1 to 0.8% by mass and Si to 0.01 to 0.15% by mass. Wire conductor for wiring.
• the composition of the copper alloy wire is 0.1 to 0.6% by mass of Sn, 0.005 to 0.3% by mass of Ag, 0.05 to 0.4% by mass of Mg, and In. 0.15 to 0.8% by mass, and at least one selected from the group consisting of Si and 0.01 to 0.15% by mass is contained in a total amount of 0.005 to 0.8% by mass.
• the wire conductor for wiring of the present invention is formed by twisting a plurality of copper alloy wires having a composition containing 0.3 to 1.5% by mass of Cr, having a tensile strength of 400 MPa to 650 MPa, and an elongation at break of 7 %, Conductivity is 65% IACS or more, the ratio of 0.2% proof stress to tensile strength is 0.7 or more and 0.95 or less, and the work hardening index is 0.03 or more and 0.17 or less. Further, the diameter of the wire can be reduced and the conductivity is excellent, and further, the terminal crimping strength, the impact breaking strength, and the flexibility are excellent.
• the electric wire conductor for wiring which has the above-mentioned outstanding physical property can be manufactured.
• the wiring wire of the present invention can reduce the weight of the wire by reducing the diameter of the conductor, and is suitable as other wires for automobiles and robots.
• a preferred embodiment of the copper (Cu) alloy wire used for the wiring conductor of the present invention will be described in detail. First, the effect of each alloy element and the range of its content will be described.
• Chromium (Cr) is an element contained in order to improve the strength of the copper alloy by forming precipitates in the matrix.
• the Cr content is 0.3 to 1.5% by mass, and preferably 0.5 to 1.4% by mass. If the amount of Cr is too small, the precipitation hardening amount is small and the strength is insufficient. If the amount is too large, the effect is saturated, and the strength cannot be improved.
• Zirconium is an element that is contained to improve the strength of the copper alloy by forming precipitates in the matrix, like chromium (Cr).
• the content of Zr is 0.005 to 0.4 mass%, preferably 0.01 to 0.3 mass%. If the amount of Zr is too small, the amount of precipitation hardening is small and no contribution to strength improvement is observed. If the amount is too large, the effect is saturated and no further improvement in strength can be expected.
• the copper alloy wire used for the wire conductor for wiring of this embodiment contains at least one of tin (Sn), silver (Ag), magnesium (Mg), indium (In), and silicon (Si), respectively. It is preferable to contain by quantity. These elements have similar functions in terms of improving strength. When contained, it is preferable to contain 0.005 to 0.8 mass% of at least one selected from Sn, Ag, Mg, In and Si as a total amount, and 0.01 to 0.7 It is more preferable to make it contain by mass%.
• the preferable content range when Sn is added is 0.1 to 0.6% by mass, and more preferably 0.2 to 0.5% by mass.
• Ag improves the strength. If the Ag content is too small, the effect cannot be sufficiently obtained. If the Ag content is too large, the effect is saturated, but the effect is saturated, and the cost is increased. From these viewpoints, the content when Ag is contained is preferably 0.005 to 0.3% by mass, and more preferably 0.01 to 0.2% by mass.
• Mg dissolves in copper and can improve the strength by distorting the lattice, and also has the effect of preventing embrittlement during heating and improving hot workability.
• the preferable content range is 0.05 to 0.4% by mass, and more preferably 0.1 to 0.3% by mass. In can be improved in strength by dissolving in copper and distorting the lattice. However, if the In content is too large, the electrical conductivity is lowered. Therefore, a preferable content range when adding In is 0.1 to 0.8% by mass, and more preferably 0.2 to 0.7% by mass. Si can be dissolved in copper and the strength can be improved by distorting the lattice.
• the preferable content range when Si is added is 0.01 to 0.15% by mass, and more preferably 0.05 to 0.1% by mass.
• the copper alloy wire used for the wire conductor for wiring of this embodiment contains zinc (Zn).
• Zn has an effect of preventing a decrease in adhesion between the copper alloy wire and the solder due to heating.
• the inclusion of Zn significantly improves the embrittlement of the interface when the copper alloy wire is soldered to another conductor or the like.
• the Zn content is preferably 0.1 to 1.5% by mass, and more preferably 0.2 to 1.3% by mass. If the Zn content is too low, the above effect cannot be seen, and if the Zn content is too high, the conductivity may decrease.
• the copper alloy wire used for the wire conductor for wiring of this embodiment is composed of an aging precipitation type alloy.
• a copper alloy wire is obtained as follows, for example. First, an alloy raw material is melt-cast to form an ingot or billet, and the ingot or billet is hot worked (or the alloy raw material is continuously cast and rolled) to obtain a copper alloy strand. Next, this copper alloy wire is subjected to cold working, and after forming a solution, it is drawn to a predetermined diameter (wire diameter) to obtain a copper alloy wire, and a plurality of the obtained copper alloy wires are twisted together If necessary, an aging heat treatment is performed after compression to a predetermined twisted wire diameter.
• a copper alloy wire refers to a state after wire drawing
• a copper alloy wire refers to a state before wire drawing.
• the diameter of the copper alloy wire is preferably 1 mm to 20 mm.
• the solution treatment can be performed simultaneously with hot working or continuous casting and rolling, and the process can be omitted. Also, cold working can be omitted.
• the wire diameter of the copper alloy wire should be 0.05 to 0.3 mm from the viewpoint of easily satisfying the above-mentioned characteristics (conductivity, strength, elongation, terminal crimping strength, impact breaking strength, flexibility, etc.).
• the thickness is preferably 0.1 to 0.2 mm.
• the wire conductor for wiring of the present invention is a stranded wire obtained by twisting a plurality of copper alloy wires, but the number of copper alloy wires to be twisted is not particularly limited, and usually 3 to 50 copper alloy wires are used. Twist together.
• the aging heat treatment In the aging heat treatment, precipitation due to Cr and Zr occurs, and an improvement in strength and an improvement in conductivity are observed, but at the same time, the strain introduced in the wire drawing process is released, so that the tensile strength (T) is 0.2.
• the percentage of yield strength (Y) (this is called the Y / T ratio) decreases.
• the aging heat treatment conditions for reducing the Y / T ratio vary depending on the degree of wire drawing. For example, a copper alloy wire having an appropriate Y / T ratio can be obtained by holding at 300 to 550 ° C. for 1 minute to 5 hours.
• the aging heat treatment may be performed by a short time aging heat treatment (for example, 1 to 30 minutes, 400 ° C.
• batch aging heat treatment for example, 1 to 5 hours, 300 ° C. to 500 ° C.
• the aging heat treatment conditions may be adjusted so as to achieve the predetermined Y / T ratio.
• the strength is lowered due to overaging, and it is not suitable for use as an electric wire.
• the Y / T ratio is 0.7 to 0.95, preferably 0.72 to 0.93
• the conductor itself has a large work-curing at the time of terminal crimping, so that the strength reduction of the crimped portion is small.
• the strain release is insufficient under the condition where the Y / T ratio exceeds 0.95, the work and the manufacturing process are such that the work hardening of the conductor itself at the time of crimping is small and the strength after aging heat treatment is low. In such a case, the strength reduction of the crimping part becomes large.
• the cross-sectional reduction rate at the time of pressure bonding is preferably 40% or less, more preferably 30% or less, because if the value is too large, the decrease in absolute strength tends to increase regardless of the Y / T ratio. On the other hand, if it is too small, the conductor part tends to come out from the caulking part of the terminal, and the electrical connection that is the original purpose becomes insufficient, so it is preferably 5% or more, more preferably 10% or more.
• the wire conductor for wiring according to the present embodiment is basically a material in which a material (copper alloy wire) is drawn and then subjected to a stranded wire process, but aging heat treatment is performed either before or after the stranded wire process. You may do it. Moreover, you may add a compression process after a stranded wire process. In this case, the aging heat treatment may be performed either before or after the compression process, but when it is performed before the compression process, the cross-section reduction rate of the crimping should be 40% or less including the cross-section reduction in compression. It ’s fine.
• C C is a coefficient
• the wire drawing degree ⁇ in the wire drawing is used, and the cross-sectional area of the material immediately after solution forming is A 0.
• the value of ⁇ is preferably 5 or more. More preferably, the value of ⁇ is 6 or more and 11 or less.
• the value of ⁇ is 3 or less, conductivity, elongation, and impact breaking load tend to decrease.
• the material (copper alloy strand) needs to be fully solutionized, but in general, the temperature required for complete solution treatment is close to the melting point of the material (copper alloy strand). It is difficult to do completely.
• the wire diameter of the material (copper alloy wire) during the solution heat treatment is large, precipitation occurs due to a delay in cooling of the center of the material during cooling after solution heat treatment, resulting in incomplete solution heat treatment. Become. Therefore, in the present invention, the degree of solution should be as follows.
• the value of ⁇ / ⁇ FULL (this is called the solution rate) is 0.7. Above, preferably 0.75 or more. If the solution rate is too small, sufficient precipitation does not occur in the subsequent aging heat treatment, and the strength cannot be obtained. In addition, even if it performs said wire drawing after that, the electrical resistivity at the time of solution forming hardly changes.
• the material of the present invention is, for example, a copper alloy strand having a diameter of 5 mm, 2.6 mm, 1 mm, etc.
• the electrical resistance of the copper alloy strand when it is completely solutionized If the ratio is 0.7 times or more, the above-mentioned characteristics can be obtained by performing an aging heat treatment after wire-drawing the copper alloy wire so as to become a copper alloy wire having a predetermined diameter.
• the wire drawing process is not necessary to carry out the wire drawing process a plurality of times continuously.
• the wire is processed after being drawn at the shipping source, and further drawn at the shipping destination to obtain a copper alloy wire, which is then subjected to aging heat treatment. It may be.
• the wire conductor for wiring of the present invention can be manufactured by any of manufacturing methods such as hot extrusion of billets, hot forging of ingots, or continuous casting.
• the electric wire conductor for wiring of the present invention is not only suitable as an electric wire conductor but also suitable as an electric wire for wiring provided with an insulating coating.
• olefin resins such as polyethylene and polypropylene, or polyvinyl chloride (PVC) resins are preferable.
• PVC polyvinyl chloride
• a flame retardant, a cross-linking agent, or the like may be added to these to improve flame retardancy, mechanical strength, or the like.
• Example 1 An alloy having the composition shown in Table 1 was melted in a high-frequency melting furnace, and each billet having a diameter of 200 mm was cast. Next, in order to perform hot working which also serves as a solution treatment, the billet was hot extruded at 950 ° C. and immediately quenched in water to obtain a copper alloy strand having a diameter of 20 mm. Next, the copper alloy wire was drawn in the cold to obtain a copper alloy wire having a diameter of 0.175 mm. Seven wires were twisted and further compressed to obtain a stranded wire (wire conductor for wiring) having a cross-sectional area of 0.13 mm 2 . The stranded wire was subjected to an aging heat treatment at 400 to 450 ° C. for 2 hours, and further covered with an insulator (polyethylene) to produce a wiring wire having a length of 1 km.
• insulator polyethylene
• Flexibility (number of repeated bending breaks) Flexibility is evaluated by pinching the electric wire with a mandrel, hanging a weight at the lower end to apply a load to suppress the deflection of the wire, and bending the wire 90 degrees left and right in this state until it breaks. It was measured. The number of times of bending back at 90 degrees was counted as one time. Flexibility was evaluated using two types of weights: 400 g, and mandrel diameters of ⁇ 25 mm (for applying low strain) and ⁇ 5 mm (for applying high strain).
• Inventive Examples 1 to 48 in Table 1 all satisfy tensile strength, elongation, and conductivity, Y / T ratio is 0.7 or more and 0.95 or less, and n value is 0.03 or more and 0.17. In the following, values that do not interfere with practical use are obtained for all of flexibility, impact rupture strength, and compression strength.
• Example 2 In Table 1, Invention Example 5, Invention Example 14, Invention Example 20, Invention Example 23, Invention Example 29, and Invention Example 42, the cross-sectional reduction rate of crimping was set to 10, 20, 30, 40%. Table 2 shows the compression strength at that time.
• Example 3 For Table 14 of the present invention, Example 23 of the present invention, Example 36 of the present invention, Example 42 of the present invention and Example 47 of the present invention, by changing the dimensions of the material to be solutionized (diameter of the copper alloy wire), Electric wires having a cross-sectional area of 0.13 mm 2 were manufactured by changing the processing degree ⁇ to 1, 3, 5, 7, 9, and 11. The procedure was the same as Example 1 except that the dimensions of the material to be solutionized were changed. Table 3 shows the characteristics of the obtained electric wire.
• Example 4 Inventive Example 14, Inventive Example 20, Inventive Example 23, Inventive Example 29, and Inventive Example 42 in Table 1 were subjected to a solution heat treatment at 750 to 950 ° C. for a wire having a diameter of 10 mm, An electric wire having a cross-sectional area of 0.13 mm 2 was manufactured by changing the conversion ratio ⁇ / ⁇ FULL from 0.5 to 0.9. The procedure was the same as in Example 1 except that the solution rate was changed. Table 4 shows the characteristics of the obtained electric wire.
• the solution rate was 0.7 or more (Invention Examples 14C-1 to 14C-4, 20C-1 to 20C-4, 23C-1 to 23C-4, 29C-1 to 29C-4, 42C-1 to 42C-4) satisfy all the characteristics, but when the solution rate is less than 0.7 (Comparative Examples Y1 to Y10), strength such as tensile strength and impact breaking load, and repeated bending The number of breaks and the terminal crimping strength after wire crimping are reduced and inferior.
• Table 5 shows comparative examples and reference examples.
• the configuration of each comparative example and reference example is as follows.
• Comparative Examples 1 to 7 are examples whose alloy compositions are outside the scope of the present invention.
• Comparative Examples 8 to 15 with respect to Invention Examples 5 and 14 in Table 1, the Y / T ratio is larger than the range of the present invention by changing the aging heat treatment condition after twisting to hold at a temperature of 500 ° C. for 30 seconds.
• the value n is 0.96, which is 0.02, which is smaller than the range of the present invention
• the cross-sectional reduction rate during crimping is 10, 20, 30, 40%.
• Comparative Examples 16 to 23 the inventive examples 20 and 29 in Table 1 were obtained by changing the aging heat treatment conditions after twisting to 570 ° C. for 8 hours, so that the Y / T ratio was within the range of the present invention.
• This is an example when 0.69 and 0.65 are set to be small, n values are set to 0.19 and 0.21 that are larger than the range of the present invention, respectively, and the cross-sectional reduction rate of crimping is set to 10, 20, 30, and 40%.
• Reference Examples 1 to 8 are examples of the inventive examples 5, 14, 20 and 29 shown in Table 1 when the cross-section reduction rate of the crimping is increased to 50% and 60%.
• Comparative Examples 1 to 7 the alloy composition is outside the range of the present invention, and satisfactory characteristics are not obtained in any of the evaluated points.
• Comparative Examples 8 to 15 are inferior in elongation, the number of repeated bending fractures, and impact fracture load compared to Invention Examples 5 and 14, and the terminal crimping strength is less than 50 N at a cross-section reduction rate of 40%.
• Comparative Examples 16 to 23 are inferior in tensile strength, number of repeated bending breaks, and terminal crimping strength as compared with Inventive Example 20 and Inventive Example 29.
• Reference Examples 1 to 8 are inferior in terminal crimping strength and lower than 50 N as compared with Invention Example 5, Invention Example 14, Invention Example 20 and Invention Example 29.
• Table 6 shows a conventional example.
• the conventional example was manufactured by the following steps. That is, about the alloy of the composition shown by the alloy component of Table 6, rough-drawing wire (corresponding to a copper alloy strand) having a diameter of 20 mm by a continuous casting and rolling apparatus by the method described in paragraph 0032 of the aforementioned Patent Document 1. Was then drawn cold to obtain a strand having a diameter of 0.175 mm. Seven strands were twisted and further compressed to obtain a stranded wire having a cross-sectional area of 0.13 mm 2 and further covered with an insulator (polyethylene) to obtain a wiring electric wire.
• an insulator polyethylene
• Conventional wires 1 and 3 were obtained by annealing the twisted wire with an electric heating device (heat treatment at an arrival temperature of 700 ° C. and an arrival time of 0.5 seconds), and conventional wires 2 and 4 were not annealed. Each characteristic was measured in the same manner as [1] to [8] described above.
• Example 5 No. 5 described in Tables 5 and 6 of the aforementioned Patent Document 3.
• the copper alloys 66, 70, and 79 were produced by the methods of Example 5 and Example 6 described in paragraphs 0045 and 0048 of Patent Document 3, respectively, to obtain copper alloy strands having a diameter of 6 mm.
• the copper alloy wire was drawn in the cold to obtain a copper alloy wire having a diameter of 0.175 mm. Seven wires were twisted and further compressed into a stranded wire having a cross-sectional area of 0.13 mm 2 .
• the wire drawing degree ⁇ at this time is 7.
• the stranded wire was subjected to an aging heat treatment at 400 to 450 ° C.
• the stranded wire is subjected to an aging heat treatment at 500 ° C. for 30 seconds or at 570 ° C. for 8 hours to obtain a wire conductor for wiring in which the Y / T ratio and the n value are out of the ranges specified in the present invention. It was. Also, after drawing the copper alloy strand having a diameter of 6 mm to a diameter of 0.07, 0.5, or 1.3 mm, each of the seven strands is twisted to form a stranded wire and subjected to aging heat treatment in the same manner as described above.
• the wire conductor for wiring was obtained by changing the value of the wire drawing degree ⁇ to 9, 5 and 3.
• the obtained wire conductor was coated with an insulator in the same manner as in Example 1 described in this specification to obtain an electric wire for wiring, and the characteristics were evaluated.
• the results are shown in Table 7.
• the numbers shown in parentheses in the sample numbers in Table 7 are alloy Nos. Described in the examples of Patent Document 3. It is.
• the present invention example 49 (66) means that it has the same alloy composition as that of the present invention example 49 and the same alloy composition as the alloy number 66 of Patent Document 3.
• Table 7 shows the following.
• the Y / T ratio, the n value, and the pre-aging degree of processing specified in the present invention (Examples 49, 49D-1, 49D-2 of the present invention) , 50, 50D-1, 50D-2, 51, 51D-1, 51D-2) showed excellent results for each characteristic, while the Y / T ratio and n value were specified in the present invention.
• any of tensile strength, elongation, number of repeated bending fractures, impact fracture strength, and terminal crimp strength is inferior.
• Comparative Example 2 Next, another comparative example is shown. No. 1 described in Table 1 of the aforementioned Patent Document 4.
• the copper alloys of Nos. 19 and 23 were each subjected to aging treatment by running heating at 350 ° C. for 30 seconds or 600 ° C. for 1200 seconds (20 minutes) according to the method described in claim 3 of Patent Document 4.
• the conductor used for the aging treatment was a stranded wire having a cross-sectional area of 0.13 mm 2 manufactured in the same process as in Example 1 described in this specification.
• the results are shown in Table 8.
• the numbers written in parentheses in the sample numbers in Table 8 are alloy Nos. Described in Table 1 of Patent Document 4. It is.
• Comparative Example 24 (19) means having the same alloy composition as Alloy No. 19 of Patent Document 4.

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