WO2017145913A1 - Wire material for connector terminal - Google Patents

Wire material for connector terminal Download PDF

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Publication number
WO2017145913A1
WO2017145913A1 PCT/JP2017/005769 JP2017005769W WO2017145913A1 WO 2017145913 A1 WO2017145913 A1 WO 2017145913A1 JP 2017005769 W JP2017005769 W JP 2017005769W WO 2017145913 A1 WO2017145913 A1 WO 2017145913A1
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WO
WIPO (PCT)
Prior art keywords
wire
connector terminal
less
strength
conductivity
Prior art date
Application number
PCT/JP2017/005769
Other languages
French (fr)
Japanese (ja)
Inventor
坂本 慧
明子 井上
鉄也 桑原
西川 太一郎
清高 宇都宮
中本 稔
佑典 大島
斉 土田
大 加茂川
Original Assignee
住友電気工業株式会社
富山住友電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2016240702A external-priority patent/JP2017150065A/en
Application filed by 住友電気工業株式会社, 富山住友電工株式会社 filed Critical 住友電気工業株式会社
Priority to US16/078,736 priority Critical patent/US20190048450A1/en
Priority to CN201780012766.3A priority patent/CN108699630A/en
Priority to EP17756352.5A priority patent/EP3421628A4/en
Publication of WO2017145913A1 publication Critical patent/WO2017145913A1/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C9/00Alloys based on copper
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00Non-insulated conductors or conductive bodies characterised by their form
    • H01B5/02Single bars, rods, wires, or strips
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02Contact members
    • H01R13/03Contact members characterised by the material, e.g. plating, or coating materials
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/08Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon

Definitions

  • the present invention relates to a wire for a connector terminal.
  • This application claims priority based on Japanese Patent Application No. 2016-031324 filed on February 22, 2016 and Japanese Patent Application No. 2016-240702 dated December 12, 2016, which All the descriptions described in the above are incorporated.
  • the connector terminals is a press-fit terminal (see, for example, Patent Document 1).
  • the press-fit terminal is a rod-shaped material that can be connected to a printed circuit board without soldering.
  • the mating member is connected to one end of the press fit terminal, and the mating member and the printed board can be electrically and mechanically connected by press-fitting the other end into the printed board.
  • the constituent materials of the connector terminal include pure copper such as tough pitch copper, copper alloy such as brass, and iron (such as [0026] in Patent Document 1). In addition, as a material excellent in springiness, there is phosphor bronze.
  • the connector terminal wire of the present disclosure is: Fe is 0.1 mass% or more and 1.5 mass% or less, Ti is 0.05 mass% or more and 0.7 mass% or less, Mg is contained in an amount of 0% by mass to 0.5% by mass, The balance is composed of Cu and impurities.
  • Connector terminals such as press-fit terminals are desired to have excellent conductivity and high rigidity and springiness. Therefore, it is desired that such a connector terminal material has excellent conductivity and high strength.
  • the above-mentioned tough pitch copper and brass are excellent in conductivity but low in strength and inferior in springiness.
  • the iron and phosphor bronze described above have high strength and excellent spring properties, but have low electrical conductivity. Such a material cannot sufficiently meet the demand for both excellent conductivity and strength.
  • one of the objects is to provide a wire for a connector terminal that has excellent conductivity and can form a high-strength connector terminal.
  • the wire for connector terminal of the present disclosure described above is excellent in conductivity and can form a high-strength connector terminal.
  • the connector terminal wire according to one aspect of the present invention is: Fe is 0.1 mass% or more and 1.5 mass% or less, Ti is 0.05 mass% or more and 0.7 mass% or less, Mg is contained in an amount of 0% by mass to 0.5% by mass, The balance is composed of Cu and impurities.
  • the connector terminal wire is made of a copper alloy having a specific composition, so that it has excellent conductivity, high strength, and excellent rigidity and springiness.
  • Fe and Ti are typically present in a Cu phase as a parent phase as a precipitate or crystallized substance containing Fe and Ti such as a compound such as Fe 2 Ti, and the strength improvement effect by precipitation strengthening and This is because it has the effect of maintaining high conductivity by reducing the solid solution in Cu.
  • Such a wire for a connector terminal as described above can be suitably used as a material for a connector terminal such as a press-fit terminal which is desired to have excellent conductivity and high rigidity and springiness.
  • Examples include a conductivity of 40% IACS or more and a tensile strength of 600 MPa or more.
  • the above form has high conductivity and tensile strength, and is excellent in conductivity and can form a high strength connector terminal.
  • the excess and deficiency of Fe with respect to Ti is small and Fe is appropriately contained with respect to Ti. Therefore, Fe and Ti are present in the state of the above precipitates and the like. The effect of maintaining high conductivity by reducing solid solution in Cu can be achieved. Therefore, the said form is excellent in electroconductivity, and can form a high intensity
  • C, Si, Mn can function as a deoxidizer for elements such as Fe and Ti. Since the above form contains C, Si, and Mn in a specific range, the deoxidation effect of these elements reduces and prevents oxidation of Fe, Ti, etc., resulting in high conductivity and high conductivity due to the inclusion of Fe or Ti. The effect of strength can be obtained appropriately. Moreover, since the said form can suppress the fall of the electroconductivity by excess containing of C, Si, and Mn, it is excellent in electroconductivity. Therefore, the said form is excellent in electroconductivity, and can form a high intensity
  • the above-mentioned form makes it difficult to relieve stress even when held at a high temperature such as 150 ° C. for a long time such as 1000 hours, and can form a connector terminal that is excellent in conductivity, high strength, and excellent in stress relaxation. .
  • Form cross-sectional area is 0.1 mm 2 or more 2.0 mm 2 or less can be mentioned.
  • the above-mentioned form is a size that can be easily used as a material for a connector terminal such as a press-fit terminal, and can be suitably used as a material for the connector terminal.
  • the above-mentioned form is a shape that can be easily used for a connector terminal material such as a press-fit terminal, and can be suitably used for the connector terminal material.
  • the connector terminal wire As an example of the connector terminal wire, The form provided with the plating layer containing at least one of Sn and Ag in at least one part of the surface is mentioned.
  • the above form is used as a material for a connector terminal such as a press-fit terminal, a plated connector terminal having a metal plating layer containing Sn or Ag, for example, a tin plating layer or a silver plating layer, can be easily manufactured. Therefore, the said form can abbreviate
  • the element content is a mass ratio (mass% or mass ppm) unless otherwise specified.
  • the wire for connector terminals of the embodiment (hereinafter sometimes referred to as a copper alloy wire) is used as a material for a connector terminal such as a press-fit terminal, and is made of a copper alloy containing a specific element in a specific range.
  • the copper alloy contains Fe of 0.1% to 1.5%, Ti of 0.05% to 0.7%, Mg of 0% to 0.5%, and the balance from Cu and impurities. It is an Fe—Ti—Cu alloy or an Fe—Ti—Mg—Cu alloy. The impurities are mainly inevitable. First, each additive element will be described in detail.
  • ⁇ Fe Fe is present mainly by precipitation in Cu as a parent phase, and contributes to improvement in strength such as tensile strength.
  • Fe is contained in an amount of 0.1% or more, a compound containing Fe and Ti can be generated satisfactorily, and a copper alloy wire having excellent strength can be obtained by precipitation strengthening. And it can be set as the copper alloy wire which has high electrical conductivity by suppressing the solid solution to the mother phase of Ti by said precipitation.
  • the strength of the copper alloy wire tends to increase as the Fe content increases.
  • the Fe content can be 0.6% or more, further 0.7% or more, 0.9% or more, 1.1% or more.
  • Fe When Fe is contained in the range of 1.5% or less, it is easy to suppress the coarsening of precipitates including Fe and Ti due to excessive Fe. As a result, breakage starting from coarse precipitates can be reduced and the strength is excellent, and in the manufacturing process, disconnection can be reduced at the time of wire drawing processing and the productivity is excellent.
  • the Fe content can be 1.3% or less, further 1.2% or less, and 1.0% or less.
  • Ti mainly exists as a precipitate together with Fe and contributes to improvement in strength such as tensile strength.
  • Ti When Ti is contained in an amount of 0.05% or more, precipitates containing Fe and Ti can be generated satisfactorily, and a copper alloy wire having excellent strength can be obtained by precipitation strengthening.
  • the amount of solid solution in the parent phase of Ti is reduced by the above precipitation, and a copper alloy wire having high conductivity can be obtained.
  • the strength of the copper alloy wire tends to increase as the Ti content increases.
  • the Ti content can be 0.1% or more, further 0.25% or more, 0.3% or more, 0.4% or more, 0.5% or more. .
  • the coarsening of the precipitate containing Fe and Ti can be easily suppressed, the fracture can be reduced and the strength is excellent, and the manufacturability is also excellent by reducing the disconnection. Moreover, it can reduce that excessive Ti dissolves in a mother phase, and it can be set as the copper alloy wire which has high electrical conductivity. Although depending on the amount of Fe and production conditions, the smaller the Ti content, the easier it is to suppress the coarsening. When it is desired to suppress the coarsening of the precipitate (reduction of breakage and breakage), the Ti content is 0.6% or less, further 0.55% or less, 0.5% or less, 0.4% or less. It can be.
  • ⁇ Fe / Ti In addition to containing Fe and Ti in the specific range described above, it is preferable to appropriately include Fe with respect to Ti. By containing Fe equal to or higher than Ti, it is easy to suppress excess Ti from solid solution in the parent phase and decrease in conductivity, and to make a copper alloy wire with higher conductivity more reliably. Can do. Moreover, there is a possibility that the strength improvement effect by precipitation strengthening may not be obtained properly due to precipitation of Fe alone or coarsening of precipitates containing Fe and Ti when not properly contained. On the other hand, when Fe is appropriately contained, both elements can be present in the parent phase as compounds having appropriate sizes, and high conductivity and high strength can be expected well.
  • the ratio Fe / Ti of the Fe content to the Ti content satisfies 1.0 to 5.5 in terms of mass ratio. If Fe / Ti is 1.0 or more, the strength improvement effect by precipitation strengthening can be favorably obtained as described above, and the strength is excellent. When high strength is desired, Fe / Ti can be 1.5 or more, further 1.8 or more, and 2.0 or more. In particular, when Fe / Ti is 2.0 or more, conductivity tends to be excellent, and Fe / Ti can be about 2.3, for example, 2.0 to 2.6. If Fe / Ti is 5.5 or less, excessive content of Fe with respect to Ti is suppressed, and the above-described coarsening is easily suppressed. When it is desired to suppress the coarsening of the precipitate, Fe / Ti can be 5.0 or less, further 4.0 or less and 3.8 or less.
  • the copper alloy constituting the connector terminal wire of the embodiment may have a Mg content of 0% and no Mg. Even in this form, if the Fe amount and Ti amount and the production conditions are adjusted, a copper alloy wire having high conductivity and high strength is obtained (see Test Example 1 described later). Moreover, this form is excellent in electroconductivity, suppressing the fall of the electrical conductivity resulting from Mg containing.
  • Mg when Mg is contained when Fe and Ti are contained in a specific range, Mg is mainly present as a solid solution in Cu as a parent phase, and tends to contribute to improvement in strength such as tensile strength. Therefore, further increase in strength can be expected by making the copper alloy constituting the connector terminal wire of the embodiment into a form containing Mg (over 0%). Although it depends on production conditions, the greater the Mg content, the higher the tensile strength tends to be, and the better the strength. When further increase in strength is desired, the Mg content can be 0.03% or more, further 0.05% or more, 0.1% or more, or 0.2% or more.
  • the Mg content can be 0.2% or less, further 0.15% or less, and 0.1% or less.
  • the copper alloy which comprises the wire for connector terminals of embodiment can contain the element which has a deoxidation effect with respect to Fe, Ti, etc. Specifically, it includes a total of 10 ppm or more and 500 ppm or less of one or more elements selected from C, Si, and Mn by mass ratio.
  • elements such as Fe and Ti may be oxidized.
  • the above-mentioned precipitates cannot be formed properly or cannot be dissolved in the matrix, and the effects of high conductivity and high strength due to the inclusion of these elements are appropriate. There is a risk that it will not be obtained.
  • the oxide becomes a starting point of breakage at the time of wire drawing or the like, and there is a possibility that the productivity is lowered.
  • at least one element of C, Mn, and Si preferably two elements (in this case, C and Mn, or C and Si are preferred), more preferably all three elements are specified.
  • the total content is 10 ppm or more, oxidation of the above-described elements can be prevented.
  • the greater the total content the easier it is to obtain an antioxidant effect, and it can be 20 ppm or more, and more preferably 30 ppm or more.
  • said total content is 500 ppm or less, it will be difficult to cause the fall of the electroconductivity by excess containing of these deoxidizer elements, and it will be excellent in electroconductivity.
  • the content of C alone is preferably 10 ppm to 300 ppm, more preferably 10 ppm to 200 ppm, and 30 ppm to 150 ppm.
  • the content of only Mn or the content of only Si is preferably 5 ppm or more and 100 ppm or less, more preferably more than 5 ppm and 50 ppm or less.
  • the total content of Mn and Si is preferably 10 ppm or more and 200 ppm or less, more preferably more than 10 ppm and 100 ppm or less.
  • the above-described antioxidant effect of elements such as Fe can be easily obtained satisfactorily.
  • the content of oxygen in the copper alloy can be 20 ppm or less, 15 ppm or less, and further 10 ppm or less.
  • Examples of the structure of the copper alloy constituting the connector terminal wire of the embodiment include a structure in which precipitates and crystallized substances containing Fe and Ti are dispersed. By having such a structure, it can be expected to increase the strength by precipitation strengthening and to secure a high conductivity by reducing the solid solution of Cu such as Ti.
  • the cross-sectional shape of the connector terminal wire of the embodiment can be appropriately selected according to the shape of the connector terminal provided as a material.
  • a typical example is a square line whose cross-sectional shape is a quadrangle such as a rectangle or a square.
  • the cross-sectional shape can be changed by adjusting the plastic working conditions.
  • the cross-sectional shape can be a wire material such as a circular shape, an elliptical shape, or a polygonal shape such as a hexagonal shape.
  • size of the wire for connector terminals of embodiment can be suitably selected in the range from which the connector terminal provided as a raw material is obtained.
  • the wire when a press-fit terminal is manufactured from a wire that is a material, the wire may be cut into a predetermined shape and size.
  • the cross-sectional area of the connector terminal wire should satisfy 0.1 mm 2 or more and 2.0 mm 2 or less, and the above-mentioned square wire has a width of about 0.1 mm or more and 3.0 mm or less and a thickness of 0.1 mm. It is possible to satisfy about 3.0 mm or less.
  • the wire for connector terminals of the embodiment is composed of the copper alloy having the specific composition described above, and is excellent in both conductivity and strength. Quantitatively, it is mentioned that the connector terminal wire satisfies at least one, preferably both, having a conductivity of 40% IACS or more and a tensile strength of 600 MPa or more. When higher conductivity is desired, the conductivity can be 45% IACS or more, 48% IACS or more, 50% IACS or more. When higher strength is desired, the tensile strength can be 620 MPa or more, further 640 MPa or more, 660 MPa or more, or 680 MPa or more.
  • the connector terminal wire according to the embodiment is made of the copper alloy having the specific composition described above, so that it is difficult to relieve stress even if it is held at a high temperature for a long time.
  • the connector terminal wire has a form in which the stress relaxation rate after being held at 150 ° C. for 1000 hours is 30% or less.
  • the bending stress in the stress relaxation test at this time is, for example, 50% of the 0.2% proof stress. Even if the connector terminal constituted by such a wire for a connector terminal is kept at a high temperature of about 150 ° C. for a long time during use, it can maintain a good electrical and mechanical connection with a printed circuit board.
  • this connector terminal wire it is possible to construct a connector terminal that has high conductivity, high strength, and excellent stress relaxation properties.
  • the stress relaxation rate can be 28% or less, and further 25% or less. A method for measuring the stress relaxation rate will be described later.
  • the electrical conductivity, tensile strength, stress relaxation rate, and the like can be set to predetermined sizes by adjusting the composition and manufacturing conditions. For example, if the number of elements such as Fe, Ti, and Mg is increased, or the degree of wire drawing is increased (thinned), the tensile strength tends to increase. For example, when heat treatment is performed during processing, the electrical conductivity may be increased (see Test Example 1 described later, sample for softening treatment). When the tensile strength is increased, the stress relaxation rate tends to increase.
  • the connector terminal wire of the embodiment can be used as it is for a connector terminal material such as a press-fit terminal.
  • the wire for connector terminals of the embodiment can be a wire with plating provided with a plating layer on at least a part of its surface.
  • a plated connector terminal can be easily manufactured, which contributes to an improvement in manufacturability of the plated connector terminal.
  • a plated wire with a plating layer can be provided only at a place where plating is desired in a connector terminal with plating. However, if a plated wire with a plating layer on the entire surface is used, the plating operation is easy and the productivity is excellent. .
  • the plating layer can be formed on the wire having the final shape and the final size.
  • the material before the final stage can be plated, and after this plating, plastic working to obtain the final shape and final size can be performed.
  • the object to be plated is a relatively large material with a simple shape, it is easy to perform plating, and it is easy to obtain a wire with plating provided with a plating layer having a uniform thickness.
  • the plating layer in the above-mentioned connector terminal with plating is in close contact with the connection target of the connector terminal (for example, a conductor such as a through-hole portion of a printed circuit board, typically composed of copper or a copper alloy), and good conduction It works to ensure state. Therefore, what has this function can be used suitably for the constituent metal of the plating layer of the wire with plating.
  • a plating layer containing at least one of Sn and Ag because of excellent adhesion to the connector terminal and adhesion to the connection target of the connector terminal.
  • it includes a plating layer composed of one kind of metal selected from tin, tin alloy, silver, and silver alloy.
  • As a base layer for the plating layer containing Sn or Ag at least one of a nickel plating layer and a copper plating layer can be provided.
  • the thickness of the plating layer (the total thickness of the base layer and the plating layer in the case where the above-described base layer is provided) can be selected as appropriate, and examples thereof include about 0.3 ⁇ m to 5 ⁇ m. If it is this range, while being able to have the above-mentioned favorable adhesiveness by the provision of a plating layer, peeling by excessive thickness is suppressed and it is easy to maintain a plating layer.
  • the wire for connector terminals of the embodiment can be used as a material for various connector terminals.
  • it can be used for materials such as press-fit terminals. Since it is desired that the connector terminal is excellent in conductivity, rigidity and springiness, in other words, strength is desired, the connector terminal wire of the embodiment is suitable for these materials. In addition, it can be expected to be used in various fields where it is desired to be excellent in both conductivity and strength.
  • the connector terminal wire according to the embodiment is made of a copper alloy having a specific composition, so that it has excellent conductivity and high strength. This effect will be specifically described in Test Example 1.
  • a wire for a connector terminal as a material for the connector terminal and appropriately performing cutting or the like, it is possible to provide a high-strength connector terminal in addition to excellent conductivity.
  • a connector terminal that is excellent in stress relaxation property can be provided because of its high strength.
  • the wire for connector terminals of the embodiment can be manufactured by a manufacturing method including the following steps, for example.
  • summary of each process is enumerated and it demonstrates in detail for every process after that.
  • ⁇ Continuous Casting Process> A cast material is produced by continuously casting a molten copper alloy having a specific composition described above.
  • ⁇ Wire Drawing Process> A wire drawing material having a predetermined size is manufactured by drawing the cast material or a processed material obtained by processing the cast material.
  • ⁇ Molding step> A predetermined shape of the wire rod for connector terminals is produced by plastic working.
  • ⁇ Heat treatment step> After the above ⁇ continuous casting step>, the material before the ⁇ molding step> is subjected to an aging treatment.
  • ⁇ plating step> is provided before ⁇ molding step> or after ⁇ molding step>.
  • ⁇ Plating step> A plated layer containing at least one of Sn and Ag is formed on at least a part of the surface of the target wire to produce a plated wire.
  • intermediate heat treatment can be performed on the target material before ⁇ drawing step>, before ⁇ forming step>, in the middle of the drawing process when the drawing process is multi-pass.
  • a cast material is produced by continuously casting a molten copper alloy having a specific composition containing Fe, Ti, and Mg as appropriate in a specific range.
  • the atmosphere during melting is a vacuum atmosphere, oxidation of elements such as Fe and Ti can be prevented.
  • the atmosphere at the time of melting is an air atmosphere, atmosphere control is unnecessary and productivity can be improved.
  • Examples of the method for adding C (carbon) include covering the molten metal surface with charcoal pieces or charcoal powder.
  • C can be supplied into the molten metal from charcoal pieces or charcoal powder in the vicinity of the hot water surface.
  • Mn and Si raw materials containing these may be prepared separately and mixed in the molten metal. In this case, even if a portion exposed from a gap formed by charcoal pieces or charcoal powder on the hot water surface comes into contact with oxygen in the atmosphere, oxidation near the hot water surface can be suppressed.
  • Examples of the raw material include simple substances of Mn and Si, and alloys of Mn, Si and Fe.
  • a high-purity carbon made of few impurities as a crucible or a mold because impurities are hardly mixed into the molten metal.
  • the connector terminal wire of the embodiment typically includes Fe and Ti as precipitates, and when Mg is included, Mg is present as a solid solution. Therefore, it is preferable that the manufacturing process of the connector terminal wire includes a process of forming a supersaturated solid solution. For example, if a solution treatment step for performing a solution treatment for forming a supersaturated solid solution is separately provided, the supersaturated solid solution can be formed at an arbitrary time. On the other hand, if the casting rate of the supersaturated solid solution is produced by increasing the cooling rate when performing continuous casting, a copper alloy wire that finally has excellent electrical and mechanical properties can be obtained without providing a separate solution treatment step. Can be manufactured. Since the manufacturing process can be reduced, the productivity is excellent. Therefore, as a manufacturing method of the connector terminal wire, it is proposed to perform continuous casting, particularly to rapidly cool the cooling rate during the cooling process.
  • the continuous casting method various methods such as a belt-and-wheel method, a twin belt method, and an upcast method can be used.
  • the upcast method is preferable because it can reduce impurities such as oxygen and easily prevent oxidation of elements such as Cu, Fe, and Ti.
  • the cooling rate in the cooling process is preferably more than 5 ° C / sec, more preferably more than 10 ° C / sec, and more than 15 ° C / sec.
  • the cast material can be subjected to various types of plastic processing and cutting.
  • the plastic working include conform extrusion, rolling (hot, warm, cold) and the like.
  • the cutting process include peeling.
  • the intermediate heat treatment described above can be performed on the processed material before drawing, the intermediate drawn material in the middle of drawing, the drawn material after drawing, and the like under the following conditions. Since the cross-sectional area of the processed material is relatively large (thick) compared to the final size wire, it is considered that this heat treatment can be easily used for batch processing that can easily manage the heating state of the entire heating target. Since the above-mentioned intermediate wire drawing material and wire drawing material have a relatively small cross section, continuous processing may be used.
  • ⁇ Intermediate heat treatment conditions ⁇ (Heat treatment temperature) 400 ° C. to 550 ° C., preferably 450 ° C. to 500 ° C. (holding time) 4 hours to 16 hours, preferably 4 hours to 10 hours
  • the above-mentioned intermediate heat treatment is intended to remove distortion or soften during processing, that is, to improve workability so that plastic processing such as wire drawing performed thereafter can be easily performed.
  • the temperature and time may be selected from the above ranges depending on the composition and the like. By removing the strain and the like, it can be expected that the electrical conductivity is restored, and even when plastic processing such as wire drawing is performed after the intermediate heat treatment, it can be expected to have high electrical conductivity. Note that when surface peeling or the like is performed after the intermediate heat treatment, surface defects due to the heat treatment can be reduced.
  • ⁇ Wire drawing process> typically, the cast material, the processed material, the intermediate heat-treated material obtained by subjecting the processed material to the intermediate heat treatment described above, at least one pass, typically a plurality of passes of wire drawing (cooling). To obtain a wire drawing material of a predetermined size.
  • the degree of processing for each pass may be appropriately adjusted according to the composition, the predetermined size, and the like.
  • the above-described intermediate heat treatment can be performed between passes. In this case, workability can be improved as described above.
  • the temperature and time may be selected from the above-mentioned ranges depending on the composition and the like.
  • a connector terminal wire having a final shape is manufactured by plastic working.
  • This plastic working can be a rolling process or the like, but can be a wire drawing process using a die having a predetermined shape.
  • a long connector terminal wire can be manufactured continuously, which is suitable for mass production. For example, if a deformed die having a quadrangular through hole is used as the die, a square wire having a quadrangular cross section can be manufactured.
  • the size of the wire drawing material used for the forming step is preferably close to the size of the final connector terminal wire.
  • the degree of processing up to the final shape can be reduced, distortion introduced with the processing can be reduced, and a connector terminal wire having high conductivity can be manufactured.
  • the intermediate heat treatment described above can be performed before the molding step. In this case, it is excellent in workability in the forming step, and it is possible to form a connector terminal wire having a predetermined final shape and a predetermined size with high accuracy, while having high strength due to an effect of improving strength by work hardening.
  • heat treatment (aging treatment) is performed mainly for the purpose of artificial aging in which precipitates containing Fe and Ti are precipitated from a raw material (typically a supersaturated solid solution).
  • a raw material typically a supersaturated solid solution.
  • this heat treatment it is possible to satisfactorily achieve the effect of improving the strength by precipitation strengthening of the precipitates and the like and the effect of maintaining high conductivity by reducing the solid solution in Cu.
  • this heat treatment can be expected to be softened to some extent, and is excellent in workability when plastic processing such as wire drawing is performed after this heat treatment.
  • the heat treatment can be performed at any time as long as it is after the above-described continuous casting process.
  • Specific implementation time is before ⁇ drawing process> (heat treatment target: cast material or processed material), in the middle of wire drawing (heat treatment target: intermediate wire drawing material), immediately after ⁇ drawing process> (heat treatment target: predetermined Size wire drawing), after ⁇ forming step> (heat treatment object: wire having a predetermined shape) and the like.
  • the implementation time is preferably before ⁇ molding step>.
  • the heat treatment conditions are considered to be easy to use batch processing that easily manages the heating state as described above, and examples thereof include the following.
  • ⁇ Aging conditions (Heat treatment temperature) 400 ° C. to 600 ° C., preferably 450 ° C. to 550 ° C. (holding time) 4 hours to 16 hours, preferably 4 hours to 10 hours or less
  • the composition type of additive element, Content
  • processing state and the like.
  • the plating layer can be formed on a round wire drawing material having a circular cross section.
  • the plating target has a simple shape and is thick to some extent, it is easy to form a plating layer having a uniform thickness with high accuracy, and the productivity is excellent.
  • the plating layer is formed on the wire having the final shape after the above-described ⁇ forming step>, there is no possibility of damaging the plating layer when subjected to plastic working in the forming step.
  • the plating layer For the formation of the plating layer, a known method such as electroplating or chemical (electroless) plating can be used depending on the desired composition.
  • a base layer may be formed as described above.
  • the thickness of the plating layer may be adjusted so that the final thickness becomes a predetermined thickness.
  • the copper alloy wire was manufactured by the following three manufacturing patterns (A), (B), and (C). In any manufacturing pattern, the following casting materials were prepared.
  • Electrolytic copper (purity 99.99% or more) and a mother alloy containing each element shown in Table 1 or each element simple substance were prepared as raw materials.
  • the prepared raw material was melted in the air using a high-purity carbon crucible (impurity amount of 20 ppm by mass or less) to prepare a molten copper alloy.
  • Table 1 shows the composition of the copper alloy (remainder Cu and impurities).
  • a cast material having a circular cross section with the following wire diameter was produced by an upcast method. The cooling rate was over 10 ° C./sec.
  • the tensile strength (MPa) and electrical conductivity (% IACS) were investigated about the copper alloy wire manufactured by manufacturing pattern (A), (B), (C). The results are shown in Table 2.
  • Tensile strength was measured using a general-purpose tensile tester in accordance with JIS Z 2241 (metal material tensile test method, 1998).
  • the conductivity was measured by the bridge method.
  • sample No. 1-1-No. The copper alloy wire No. 1-17 is Sample No. 1-101-No. Compared with 1-103, it can be seen that it has excellent conductivity and high strength. Quantitatively, sample no. 1-1-No. 1-17 has an electric conductivity of 40% IACS or more and a tensile strength of 600 MPa or more. One reason for this is that sample no. 1-1-No. In No. 1-17, it is conceivable that the alloy is composed of a copper alloy having a specific composition containing Fe, Ti, and Mg as appropriate in the specific range.
  • sample no. 1-1-No. 1-17 is 42% IACS or more, many samples are 45% IACS or more, many samples are 50% IACS or more, and 54% IACS or more. In addition, there are many samples that are 60% IACS or higher.
  • sample no. 1-1-No. 1-17 is 650 MPa or more, more than 680 MPa, and there are many samples of 690 MPa or more, and further 700 MPa or more. Furthermore, there are samples that satisfy 750 MPa or more, 800 MPa or more, and 900 MPa or more.
  • Sample No. 1-7 and 1-8 have both higher conductivity and tensile strength.
  • precipitates containing Fe and Ti can be generated satisfactorily, and the effect of improving the strength by precipitation strengthening and the effect of maintaining the conductivity of Cu by suppressing solid solution in Cu are considered. It is done.
  • Sample No. containing Mg in addition to Fe and Ti Sample Nos. 1-9 and 1-10 and Mg-free samples In comparison with 1-11, 1-12, sample No. 1 containing Mg It can be seen that 1-9 and 1-10 are superior in strength.
  • Sample No. containing Mg Sample Nos. 1-15 and 1-16 and Mg-free samples 1-13 and 1-14, sample No. 1 containing Mg It can be seen that 1-15 and 1-16 are superior in strength.
  • Sample No. containing Mg 1-7, 1-8 and Sample No. A comparison between 1-15 and 1-16 shows that the higher the Mg content, the higher the strength. In this test, sample Nos. Containing 0.2% by mass or more and 0.3% by mass or more of Mg were used.
  • Nos. 1-15 to 1-17 have a tensile strength of 950 MPa or more and are very high in strength.
  • Mg is not included, it turns out that electrical conductivity tends to become higher.
  • sample No. 1-1-No. Low conductivity compared to 1-17 One reason for this is that sample no. 1-104 may have an Fe / Ti ratio of 10 by mass.
  • Sample No. Paying attention to 1-103 sample no. 1-1-No. Low conductivity compared to 1-17.
  • sample no. It is conceivable that 1-103 has too much Fe and Fe / Ti is too large by mass ratio.
  • 1-101 and 1-102 are inferior in strength. From these facts, it is considered that the Fe content is more than 0.05% and less than 2%, and Fe / Ti is preferably more than 0.5 and less than 10, and more preferably 1.0 or more and 5.5 or less.
  • the content of C is 60 mass ppm or less
  • the total content of Mn and Si is 20 mass ppm or less
  • the total content of these three elements is 100 mass ppm or less, particularly 80 mass ppm or less. If so, it is unlikely that the conductivity and strength are lowered due to the inclusion of these elements, and conversely, Fe and Ti are considered to function properly.
  • sample No. 1-17 tend to have higher electrical conductivity than when no intermediate heat treatment is performed (Sample Nos. 1-1, 1-4, and 1-15).
  • the electrical conductivity may be improved by performing an intermediate heat treatment after the wire drawing or the like (see, for example, Sample No. 1-3).
  • the wire 1-17 has excellent stress relaxation properties.
  • the stress relaxation rate of the 1-6 wire, the phosphor bronze wire, and the brass wire were examined as follows.
  • the stress relaxation rate is measured by the cantilever method with reference to the Japan Copper and Brass Association technical standard “Stress relaxation test method by bending a thin strip” (JCBA, T309: 2004).
  • the following heat resistance test is performed by placing the sample in a bowed state by applying a predetermined bending stress to the sample in a state where the sample is supported by a holding block.
  • the conditions for the heat resistance test are a predetermined bending stress of 50% of 0.2% proof stress, a heating temperature of 150 ° C., and a holding time selected from 10 hours to 1000 hours.
  • the stress relaxation rate (%) (permanent deflection displacement ⁇ t / Determine initial deflection displacement ⁇ 0 ) ⁇ 100.
  • the permanent deflection displacement ⁇ t is the deflection displacement of the test piece that occurs when the bending stress is unloaded after the above heat resistance test.
  • Table 3 shows the properties of the wire of each sample (conductivity (% IACS), tensile strength (MPa), 0.2% proof stress (MPa)), and stress relaxation rate (%) for each holding time.
  • the characteristics of the wire of each sample were measured by the above-described metal material tensile test method and bridge method.
  • Sample No. as shown in Table 3. 1-1, no. All of the wires 1-6 were phosphor bronze sample nos. 1-201 and brass sample no. Compared to 1-202, it has a good balance between high conductivity and high strength, and has a low stress relaxation rate, making it difficult to relieve stress.
  • sample no. 1-1, no. Sample No. 1-6 for phosphor bronze which is considered to be excellent in springiness.
  • the stress relaxation rate is lower than 1-201, and it is 30% or less, and further 25% or less even after 1000 hours.
  • sample no. In 1-6 the stress relaxation rate after 1000 hours is less than 20%.
  • the wire 1-17 has a low stress relaxation rate and is expected to be difficult to relax.
  • the jig includes a substrate with a short length L S than the length L 0 of the sample (wires) are those from both ends of the substrate ⁇ like and a support leg which protrude respectively, between the support legs Fix both ends of the sample by placing the sample so as to cross.
  • a predetermined bending stress for example, 80% of proof stress
  • proof stress is applied to the sample and the sample bent in a bow shape is placed between the support legs, and both ends of the sample are fixed to a jig.
  • the sample is subjected to the following heat resistance test after placing the jig in a heating furnace with the predetermined bending stress applied.
  • the conditions for the heat resistance test are a heating temperature of 150 ° C. and a holding time selected from 10 hours to 1000 hours.
  • the stress relaxation rate is obtained from the initial deflection displacement and the permanent deflection displacement.
  • the predetermined bending stress is 80% of the proof stress
  • the heating temperature of the heat test is 150 ° C.
  • the holding time is 100 hours
  • the stress relaxation rate of brass C2600-H material
  • This stress relaxation rate of brass is a value described in a copper strip product characteristic database (Japan Copper and Brass Association).
  • sample No. 1-1-No The stress relaxation rate (supported at both ends) of the wire 1-17 can be 30% or less, that is, it is expected to be superior to brass even in the case of supporting both ends.
  • a copper alloy wire composed of a copper alloy containing Fe, Ti, and Mg as appropriate in a specific range has high conductivity and high strength.
  • a highly conductive and high-strength wire can be obtained by performing a specific heat treatment including a specific composition and at least an aging treatment.
  • the continuous casting process also serves as a solution heat treatment process, or the final shape is formed by wire drawing using a deformed die, thereby reducing the number of processes and long wire rods. It was shown that it is excellent also in manufacturability because it can be manufactured continuously.
  • the present invention is not limited to these exemplifications, but is defined by the scope of the claims, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.
  • the composition of the copper alloy of Test Example 1 the width and thickness of the square wire, the heat treatment conditions, and the like can be changed as appropriate.

Abstract

According to the present invention, a wire material for a connector terminal contains 0.1-1.5 mass% Fe, 0.05-0.7 mass% Ti, 0-0.5 mass% Mg, and the remainder comprises Cu and impurities.

Description

コネクタ端子用線材Wire for connector terminal
 本発明は、コネクタ端子用線材に関する。
 本出願は、2016年02月22日付の日本国出願の特願2016-031324、及び2016年12月12日付の日本国出願の特願2016-240702に基づく優先権を主張し、前記日本国出願に記載された全ての記載内容を援用するものである。
The present invention relates to a wire for a connector terminal.
This application claims priority based on Japanese Patent Application No. 2016-031324 filed on February 22, 2016 and Japanese Patent Application No. 2016-240702 dated December 12, 2016, which All the descriptions described in the above are incorporated.
 コネクタ端子の一つに、プレスフィット端子がある(例えば、特許文献1参照)。プレスフィット端子は、無はんだで、プリント基板と接続可能な棒状材である。プレスフィット端子は、その一端部に相手側部材が接続され、他端部をプリント基板に圧入することで、相手側部材とプリント基板とを電気的及び機械的に接続できる。 One of the connector terminals is a press-fit terminal (see, for example, Patent Document 1). The press-fit terminal is a rod-shaped material that can be connected to a printed circuit board without soldering. The mating member is connected to one end of the press fit terminal, and the mating member and the printed board can be electrically and mechanically connected by press-fitting the other end into the printed board.
 上記のコネクタ端子の構成材料には、タフピッチ銅などの純銅や、黄銅などの銅合金、鉄がある(特許文献1の[0026]など)。その他、ばね性に優れる材料として、リン青銅などがある。 The constituent materials of the connector terminal include pure copper such as tough pitch copper, copper alloy such as brass, and iron (such as [0026] in Patent Document 1). In addition, as a material excellent in springiness, there is phosphor bronze.
特開2014-149956号公報JP 2014-149956 A
 本開示のコネクタ端子用線材は、
 Feを0.1質量%以上1.5質量%以下、
 Tiを0.05質量%以上0.7質量%以下、
 Mgを0質量%以上0.5質量%以下含有し、
 残部がCu及び不純物から構成される。
The connector terminal wire of the present disclosure is:
Fe is 0.1 mass% or more and 1.5 mass% or less,
Ti is 0.05 mass% or more and 0.7 mass% or less,
Mg is contained in an amount of 0% by mass to 0.5% by mass,
The balance is composed of Cu and impurities.
[本開示が解決しようとする課題]
 プレスフィット端子などのコネクタ端子には、導電性に優れ、剛性やばね性が高いことが望まれる。従って、このようなコネクタ端子の素材には、導電性に優れ、高強度であることが望まれる。
[Problems to be solved by the present disclosure]
Connector terminals such as press-fit terminals are desired to have excellent conductivity and high rigidity and springiness. Therefore, it is desired that such a connector terminal material has excellent conductivity and high strength.
 上述のタフピッチ銅や黄銅は、導電性に優れるものの、強度が低く、ばね性に劣る。上述の鉄やリン青銅は、高強度であり、ばね性に優れるものの、導電率が低い。このような材料では、導電性と強度との双方に優れるという要求に十分に対応できない。 The above-mentioned tough pitch copper and brass are excellent in conductivity but low in strength and inferior in springiness. The iron and phosphor bronze described above have high strength and excellent spring properties, but have low electrical conductivity. Such a material cannot sufficiently meet the demand for both excellent conductivity and strength.
 昨今、電気・電子機器の小型化、薄型化などに伴い、部品の小型化が望まれる。より小型なコネクタ端子を形成するために、線材の断面積をより小さくしたり、細くしたりした場合でも、導電性に優れ、高強度なコネクタ端子を形成できるように、導電性に優れつつ、より高強度な線材が望まれる。 Recently, as electric and electronic devices become smaller and thinner, it is desired to reduce the size of parts. Even when the cross-sectional area of the wire is made smaller or thinner in order to form a smaller connector terminal, it is excellent in conductivity so that it can form a connector terminal with high conductivity and high strength, A higher-strength wire is desired.
 そこで、導電性に優れ、高強度なコネクタ端子を形成できるコネクタ端子用線材を提供することを目的の一つにする。 Therefore, one of the objects is to provide a wire for a connector terminal that has excellent conductivity and can form a high-strength connector terminal.
[本開示の効果]
 上記の本開示のコネクタ端子用線材は、導電性に優れ、高強度なコネクタ端子を形成できる。
[Effects of the present disclosure]
The wire for connector terminal of the present disclosure described above is excellent in conductivity and can form a high-strength connector terminal.
[本願発明の実施形態の説明]
 最初に本願発明の実施形態の内容を列記して説明する。
(1)本願発明の一態様に係るコネクタ端子用線材は、
 Feを0.1質量%以上1.5質量%以下、
 Tiを0.05質量%以上0.7質量%以下、
 Mgを0質量%以上0.5質量%以下含有し、
 残部がCu及び不純物から構成される。
[Description of Embodiment of Present Invention]
First, the contents of the embodiments of the present invention will be listed and described.
(1) The connector terminal wire according to one aspect of the present invention is:
Fe is 0.1 mass% or more and 1.5 mass% or less,
Ti is 0.05 mass% or more and 0.7 mass% or less,
Mg is contained in an amount of 0% by mass to 0.5% by mass,
The balance is composed of Cu and impurities.
 上記のコネクタ端子用線材は、特定の組成の銅合金から構成されることで、導電性に優れる上に、高強度であり、剛性やばね性にも優れる。上記銅合金においてFe及びTiは、代表的には、FeTiなどの化合物といったFe及びTiを含む析出物や晶出物として母相であるCu相に存在し、析出強化による強度向上効果とCuへの固溶低減による高い導電率の維持効果とを有するからである。このような上記のコネクタ端子用線材は、導電性に優れることと、剛性やばね性が高いこととが望まれるプレスフィット端子などのコネクタ端子の素材に好適に利用できる。 The connector terminal wire is made of a copper alloy having a specific composition, so that it has excellent conductivity, high strength, and excellent rigidity and springiness. In the copper alloy, Fe and Ti are typically present in a Cu phase as a parent phase as a precipitate or crystallized substance containing Fe and Ti such as a compound such as Fe 2 Ti, and the strength improvement effect by precipitation strengthening and This is because it has the effect of maintaining high conductivity by reducing the solid solution in Cu. Such a wire for a connector terminal as described above can be suitably used as a material for a connector terminal such as a press-fit terminal which is desired to have excellent conductivity and high rigidity and springiness.
(2)上記のコネクタ端子用線材の一例として、
 導電率が40%IACS以上、引張強さが600MPa以上である形態が挙げられる。
(2) As an example of the connector terminal wire,
Examples include a conductivity of 40% IACS or more and a tensile strength of 600 MPa or more.
 上記形態は、導電率及び引張強さが高く、導電性に優れる上に高強度なコネクタ端子を形成できる。 The above form has high conductivity and tensile strength, and is excellent in conductivity and can form a high strength connector terminal.
(3)上記のコネクタ端子用線材の一例として、
 質量比で、Fe/Tiが1.0以上5.5以下である形態が挙げられる。
(3) As an example of the above connector terminal wire,
The form whose Fe / Ti is 1.0 or more and 5.5 or less by mass ratio is mentioned.
 上記形態は、Tiに対するFeの過不足量が少なく、Tiに対してFeを適切に含むため、Fe及びTiが上記析出物などの状態で存在して、析出強化による強度向上と、特にTiのCuへの固溶低減による高い導電率の維持効果とを図ることができる。従って、上記形態は、導電性に優れる上に高強度なコネクタ端子を形成できる。 In the above-mentioned form, the excess and deficiency of Fe with respect to Ti is small and Fe is appropriately contained with respect to Ti. Therefore, Fe and Ti are present in the state of the above precipitates and the like. The effect of maintaining high conductivity by reducing solid solution in Cu can be achieved. Therefore, the said form is excellent in electroconductivity, and can form a high intensity | strength connector terminal.
(4)上記のコネクタ端子用線材の一例として、
 更に、質量割合で、C,Si,及びMnから選択される1種以上の元素を合計で10ppm以上500ppm以下含む形態が挙げられる。
(4) As an example of the above connector terminal wire,
Furthermore, the form which contains 10 ppm or more and 500 ppm or less in total of 1 or more types of elements selected from C, Si, and Mn by the mass ratio is mentioned.
 C,Si,Mnは、FeやTiなどの元素に対して、脱酸剤として機能することができる。上記形態は、C,Si,Mnを特定の範囲で含有するため、これらの元素の脱酸効果によってFeやTiなどの酸化を低減、防止して、FeやTiの含有による高導電性及び高強度という効果を適切に得られる。また、上記形態は、C,Si,Mnの過剰含有による導電率の低下を抑制できることからも、導電性に優れる。従って、上記形態は、導電性に優れる上に高強度なコネクタ端子を形成できる。 C, Si, Mn can function as a deoxidizer for elements such as Fe and Ti. Since the above form contains C, Si, and Mn in a specific range, the deoxidation effect of these elements reduces and prevents oxidation of Fe, Ti, etc., resulting in high conductivity and high conductivity due to the inclusion of Fe or Ti. The effect of strength can be obtained appropriately. Moreover, since the said form can suppress the fall of the electroconductivity by excess containing of C, Si, and Mn, it is excellent in electroconductivity. Therefore, the said form is excellent in electroconductivity, and can form a high intensity | strength connector terminal.
(5)上記のコネクタ端子用線材の一例として、
 150℃で1000時間保持した後の応力緩和率が30%以下である形態が挙げられる。
(5) As an example of the above connector terminal wire,
The form whose stress relaxation rate after hold | maintaining at 150 degreeC for 1000 hours is 30% or less is mentioned.
 上記形態は、150℃といった高温に1000時間といった長時間に亘って保持された場合でも応力緩和し難く、導電性に優れ、高強度である上に、応力緩和性にも優れるコネクタ端子を形成できる。 The above-mentioned form makes it difficult to relieve stress even when held at a high temperature such as 150 ° C. for a long time such as 1000 hours, and can form a connector terminal that is excellent in conductivity, high strength, and excellent in stress relaxation. .
(6)上記のコネクタ端子用線材の一例として、
 横断面積が0.1mm以上2.0mm以下である形態が挙げられる。
(6) As an example of the connector terminal wire,
Form cross-sectional area is 0.1 mm 2 or more 2.0 mm 2 or less can be mentioned.
 上記形態は、プレスフィット端子などのコネクタ端子の素材に利用し易い大きさであり、上記コネクタ端子の素材に好適に利用できる。 The above-mentioned form is a size that can be easily used as a material for a connector terminal such as a press-fit terminal, and can be suitably used as a material for the connector terminal.
(7)上記のコネクタ端子用線材の一例として、
 横断面形状が四角形状の角線である形態が挙げられる。
(7) As an example of the above connector terminal wire,
The form whose cross-sectional shape is a square-shaped square line is mentioned.
 上記形態は、プレスフィット端子などのコネクタ端子の素材に利用し易い形状であり、上記コネクタ端子の素材に好適に利用できる。 The above-mentioned form is a shape that can be easily used for a connector terminal material such as a press-fit terminal, and can be suitably used for the connector terminal material.
(8)上記のコネクタ端子用線材の一例として、
 表面の少なくとも一部に、Sn及びAgの少なくとも一方を含むめっき層を備える形態が挙げられる。
(8) As an example of the connector terminal wire,
The form provided with the plating layer containing at least one of Sn and Ag in at least one part of the surface is mentioned.
 上記形態をプレスフィット端子などのコネクタ端子の素材に利用すれば、表面にSnやAgを含む金属のめっき層、例えば錫めっき層や銀めっき層を備えるめっき付コネクタ端子を容易に製造できる。従って、上記形態は、端子成形後にめっき層の形成工程を省略でき、めっき付コネクタ端子の生産性の向上に寄与する。 If the above form is used as a material for a connector terminal such as a press-fit terminal, a plated connector terminal having a metal plating layer containing Sn or Ag, for example, a tin plating layer or a silver plating layer, can be easily manufactured. Therefore, the said form can abbreviate | omit the formation process of a plating layer after terminal shaping | molding, and contributes to the improvement of the productivity of a connector terminal with plating.
[本願発明の実施形態の詳細]
 以下、本願発明の実施の形態を詳細に説明する。元素の含有量は、断りが無い限り質量割合(質量%又は質量ppm)とする。
[Details of the embodiment of the present invention]
Hereinafter, embodiments of the present invention will be described in detail. The element content is a mass ratio (mass% or mass ppm) unless otherwise specified.
[銅合金線]
(組成)
 実施形態のコネクタ端子用線材(以下、銅合金線と呼ぶことがある)は、プレスフィット端子などのコネクタ端子の素材に利用されるものであり、特定の元素を特定の範囲で含む銅合金から構成されることを特徴の一つとする。上記銅合金は、Feを0.1%以上1.5%以下、Tiを0.05%以上0.7%以下、Mgを0%以上0.5%以下含有し、残部がCu及び不純物から構成されるFe-Ti-Cu合金、又はFe-Ti-Mg-Cu合金である。上記不純物とは主として不可避なものをいう。まず、各添加元素を詳細に説明する。
[Copper alloy wire]
(composition)
The wire for connector terminals of the embodiment (hereinafter sometimes referred to as a copper alloy wire) is used as a material for a connector terminal such as a press-fit terminal, and is made of a copper alloy containing a specific element in a specific range. One of the characteristics is that it is configured. The copper alloy contains Fe of 0.1% to 1.5%, Ti of 0.05% to 0.7%, Mg of 0% to 0.5%, and the balance from Cu and impurities. It is an Fe—Ti—Cu alloy or an Fe—Ti—Mg—Cu alloy. The impurities are mainly inevitable. First, each additive element will be described in detail.
・Fe
 Feは、主として、母相であるCuに析出して存在し、引張強さといった強度の向上に寄与する。
 Feを0.1%以上含有すると、Fe及びTiを含む化合物などを良好に生成でき、析出強化によって強度に優れる銅合金線とすることができる。かつ、上記の析出によってTiの母相への固溶を抑制して、高い導電率を有する銅合金線とすることができる。Ti量や製造条件にもよるが、Feの含有量が多いほど、銅合金線の強度が高くなり易い。高強度化などを望む場合には、Feの含有量を0.6%以上、更に0.7%以上、0.9%以上、1.1%以上とすることができる。
 Feを1.5%以下の範囲で含有すると、過剰なFeによるFeとTiとを含む析出物の粗大化を抑制し易い。その結果、粗大な析出物を起点とする破断を低減できて強度に優れる上に、製造過程では伸線加工時などで断線を低減でき、製造性に優れる。Ti量や製造条件にもよるが、Feの含有量が少ないほど、上述の析出物の粗大化などを抑制し易い。析出物の粗大化の抑制(破断、断線の低減)などを望む場合には、Feの含有量を1.3%以下、更に1.2%以下、1.0%以下とすることができる。
・ Fe
Fe is present mainly by precipitation in Cu as a parent phase, and contributes to improvement in strength such as tensile strength.
When Fe is contained in an amount of 0.1% or more, a compound containing Fe and Ti can be generated satisfactorily, and a copper alloy wire having excellent strength can be obtained by precipitation strengthening. And it can be set as the copper alloy wire which has high electrical conductivity by suppressing the solid solution to the mother phase of Ti by said precipitation. Although depending on the amount of Ti and production conditions, the strength of the copper alloy wire tends to increase as the Fe content increases. When high strength is desired, the Fe content can be 0.6% or more, further 0.7% or more, 0.9% or more, 1.1% or more.
When Fe is contained in the range of 1.5% or less, it is easy to suppress the coarsening of precipitates including Fe and Ti due to excessive Fe. As a result, breakage starting from coarse precipitates can be reduced and the strength is excellent, and in the manufacturing process, disconnection can be reduced at the time of wire drawing processing and the productivity is excellent. Although depending on the amount of Ti and production conditions, the smaller the Fe content, the easier it is to suppress the coarsening of the precipitates described above. When it is desired to suppress the coarsening of the precipitate (reduction of breakage and disconnection), the Fe content can be 1.3% or less, further 1.2% or less, and 1.0% or less.
・Ti
 Tiは、主として、Feと共に析出物として存在して引張強さといった強度の向上に寄与する。
 Tiを0.05%以上含有すると、FeとTiとを含む析出物などを良好に生成でき、析出強化によって強度に優れる銅合金線とすることができる。また、上記の析出によってTiの母相への固溶量が少なくなって、高い導電率を有する銅合金線とすることができる。Fe量や製造条件にもよるが、Tiの含有量が多いほど、銅合金線の強度が高くなり易い。高強度化などを望む場合には、Tiの含有量を0.1%以上、更に0.25%以上、0.3%以上、0.4%以上、0.5%以上とすることができる。
 Tiを0.7%以下の範囲で含有すると、FeとTiとを含む析出物の粗大化を抑制し易く破断を低減できて強度に優れる上に、断線の低減によって製造性にも優れる。また、過剰なTiが母相に固溶することを低減して、高い導電率を有する銅合金線とすることができる。Fe量や製造条件にもよるが、Tiの含有量が少ないほど、上記粗大化などを抑制し易い。析出物の粗大化の抑制(破断や断線の低減)などを望む場合には、Tiの含有量を0.6%以下、更に0.55%以下、0.5%以下、0.4%以下とすることができる。
・ Ti
Ti mainly exists as a precipitate together with Fe and contributes to improvement in strength such as tensile strength.
When Ti is contained in an amount of 0.05% or more, precipitates containing Fe and Ti can be generated satisfactorily, and a copper alloy wire having excellent strength can be obtained by precipitation strengthening. Moreover, the amount of solid solution in the parent phase of Ti is reduced by the above precipitation, and a copper alloy wire having high conductivity can be obtained. Although depending on the amount of Fe and production conditions, the strength of the copper alloy wire tends to increase as the Ti content increases. When it is desired to increase the strength, the Ti content can be 0.1% or more, further 0.25% or more, 0.3% or more, 0.4% or more, 0.5% or more. .
When Ti is contained in the range of 0.7% or less, the coarsening of the precipitate containing Fe and Ti can be easily suppressed, the fracture can be reduced and the strength is excellent, and the manufacturability is also excellent by reducing the disconnection. Moreover, it can reduce that excessive Ti dissolves in a mother phase, and it can be set as the copper alloy wire which has high electrical conductivity. Although depending on the amount of Fe and production conditions, the smaller the Ti content, the easier it is to suppress the coarsening. When it is desired to suppress the coarsening of the precipitate (reduction of breakage and breakage), the Ti content is 0.6% or less, further 0.55% or less, 0.5% or less, 0.4% or less. It can be.
・Fe/Ti
 Fe及びTiを上述の特定の範囲で含有することに加えて、Tiに対してFeを適切に含むことが好ましい。Tiに対してFeを同等又はそれ以上に含むことで、過剰のTiが母相に固溶して導電率が低下することを抑制し易く、より確実に導電率が高い銅合金線とすることができる。また、適切に含まない場合にFe単体が析出したり、Fe及びTiを含む析出物が粗大化したりするなどして、析出強化による強度向上効果を適切に得られない恐れがあるが、Tiに対してFeを適切に含むと、両元素は適切な大きさの化合物などとして母相に存在でき、高導電性及び高強度を良好に望める。具体的には、Tiの含有量に対するFeの含有量の割合Fe/Tiが、質量比で1.0以上5.5以下を満たすことが挙げられる。
 Fe/Tiが1.0以上であれば、上述のように析出強化による強度向上効果を良好に得られて、強度に優れる。高強度化などを望む場合には、Fe/Tiを1.5以上、更に1.8以上、2.0以上とすることができる。特に、Fe/Tiが2.0以上であると導電性により優れる傾向にあり、Fe/Tiを2.3前後、例えば2.0以上2.6以下とすることができる。
 Fe/Tiが5.5以下であれば、Tiに対するFeの過剰含有を抑制して、上述の粗大化を抑制し易い。析出物の粗大化の抑制などを望む場合には、Fe/Tiを5.0以下、更に4.0以下、3.8以下とすることができる。
・ Fe / Ti
In addition to containing Fe and Ti in the specific range described above, it is preferable to appropriately include Fe with respect to Ti. By containing Fe equal to or higher than Ti, it is easy to suppress excess Ti from solid solution in the parent phase and decrease in conductivity, and to make a copper alloy wire with higher conductivity more reliably. Can do. Moreover, there is a possibility that the strength improvement effect by precipitation strengthening may not be obtained properly due to precipitation of Fe alone or coarsening of precipitates containing Fe and Ti when not properly contained. On the other hand, when Fe is appropriately contained, both elements can be present in the parent phase as compounds having appropriate sizes, and high conductivity and high strength can be expected well. Specifically, the ratio Fe / Ti of the Fe content to the Ti content satisfies 1.0 to 5.5 in terms of mass ratio.
If Fe / Ti is 1.0 or more, the strength improvement effect by precipitation strengthening can be favorably obtained as described above, and the strength is excellent. When high strength is desired, Fe / Ti can be 1.5 or more, further 1.8 or more, and 2.0 or more. In particular, when Fe / Ti is 2.0 or more, conductivity tends to be excellent, and Fe / Ti can be about 2.3, for example, 2.0 to 2.6.
If Fe / Ti is 5.5 or less, excessive content of Fe with respect to Ti is suppressed, and the above-described coarsening is easily suppressed. When it is desired to suppress the coarsening of the precipitate, Fe / Ti can be 5.0 or less, further 4.0 or less and 3.8 or less.
・Mg
 実施形態のコネクタ端子用線材を構成する銅合金は、Mgの含有量が0%であり、Mgを含まない形態とすることができる。この形態でも、Fe量及びTi量と製造条件とを調整すれば、導電率が高く、高強度な銅合金線となる(後述の試験例1参照)。また、この形態は、Mg含有に起因する導電率の低下を抑制して、導電性により優れる。
・ Mg
The copper alloy constituting the connector terminal wire of the embodiment may have a Mg content of 0% and no Mg. Even in this form, if the Fe amount and Ti amount and the production conditions are adjusted, a copper alloy wire having high conductivity and high strength is obtained (see Test Example 1 described later). Moreover, this form is excellent in electroconductivity, suppressing the fall of the electrical conductivity resulting from Mg containing.
 一方、Fe及びTiを特定の範囲で含む場合にMgを含むと、Mgは、主として、母相であるCuに固溶して存在し、引張強さといった強度の向上に寄与する傾向にある。従って、実施形態のコネクタ端子用線材を構成する銅合金を、Mgを含む(0%超)形態とすることで、更なる高強度化が望める。製造条件にもよるが、Mgの含有量が多いほど、引張強さが高くなり易い傾向にあり、強度により優れる。更なる高強度化などを望む場合には、Mgの含有量を0.03%以上、更に0.05%以上、0.1%以上、0.2%以上とすることができる。
 Mgを含有する場合にMgの含有量が0.5%以下であれば、MgがCuに過剰に固溶することによる導電率の低下を抑制して、導電率が高い銅合金線とすることができる。また、Mgの過剰固溶に起因する加工性の低下を抑制して、伸線加工などの塑性加工が行い易く、製造性に優れる。高導電性、良好な加工性などを望む場合には、Mgの含有量を0.2%以下、更に0.15%以下、0.1%以下とすることができる。
On the other hand, when Mg is contained when Fe and Ti are contained in a specific range, Mg is mainly present as a solid solution in Cu as a parent phase, and tends to contribute to improvement in strength such as tensile strength. Therefore, further increase in strength can be expected by making the copper alloy constituting the connector terminal wire of the embodiment into a form containing Mg (over 0%). Although it depends on production conditions, the greater the Mg content, the higher the tensile strength tends to be, and the better the strength. When further increase in strength is desired, the Mg content can be 0.03% or more, further 0.05% or more, 0.1% or more, or 0.2% or more.
When Mg is contained, if the Mg content is 0.5% or less, a decrease in conductivity due to excessive dissolution of Mg in Cu is suppressed, and a copper alloy wire having high conductivity is obtained. Can do. Moreover, the fall of the workability resulting from the excessive solid solution of Mg is suppressed, plastic processing such as wire drawing is easily performed, and the productivity is excellent. When high conductivity, good workability, and the like are desired, the Mg content can be 0.2% or less, further 0.15% or less, and 0.1% or less.
・C,Si,Mn
 実施形態のコネクタ端子用線材を構成する銅合金は、FeやTiなどに対して脱酸効果を有する元素を含むことができる。具体的には、質量割合で、C,Si,及びMnから選択される1種以上の元素を合計で10ppm以上500ppm以下含むことが挙げられる。
・ C, Si, Mn
The copper alloy which comprises the wire for connector terminals of embodiment can contain the element which has a deoxidation effect with respect to Fe, Ti, etc. Specifically, it includes a total of 10 ppm or more and 500 ppm or less of one or more elements selected from C, Si, and Mn by mass ratio.
 ここで、製造過程で大気雰囲気などの酸素含有雰囲気とすると、Fe,Tiといった元素が酸化する恐れがある。これらの元素が酸化物となると、上述の析出物などを適切に形成できなかったり、母相に固溶できなかったりなどして、これらの元素の含有による高導電性及び高強度という効果を適切に得られない恐れがある。上記酸化物が伸線加工時などに破断の起点となり、製造性の低下を招く恐れもある。これに対し、C,Mn,及びSiの少なくとも1種の元素、好ましくは2種の元素(この場合、CとMn、又はCとSiが好ましい)、より好ましくは3種全ての元素を特定の範囲で含むことで、Fe及びTiの析出による高導電性の確保と、析出強化による高強度化とを図り、導電性に優れ、高強度な銅合金線とすることができる。 Here, if an oxygen-containing atmosphere such as an air atmosphere is used in the manufacturing process, elements such as Fe and Ti may be oxidized. When these elements become oxides, the above-mentioned precipitates cannot be formed properly or cannot be dissolved in the matrix, and the effects of high conductivity and high strength due to the inclusion of these elements are appropriate. There is a risk that it will not be obtained. The oxide becomes a starting point of breakage at the time of wire drawing or the like, and there is a possibility that the productivity is lowered. In contrast, at least one element of C, Mn, and Si, preferably two elements (in this case, C and Mn, or C and Si are preferred), more preferably all three elements are specified. By including in the range, high conductivity by precipitation of Fe and Ti and high strength by precipitation strengthening can be achieved, and a copper alloy wire having excellent conductivity and high strength can be obtained.
 上記の合計含有量が10ppm以上であれば、上述の元素の酸化を防止できる。上記合計含有量が多いほど、酸化防止効果を得易く、20ppm以上、更に30ppm以上とすることができる。
 上記の合計含有量が500ppm以下であれば、これら脱酸剤元素の過剰含有による導電性の低下を招き難く、導電性に優れる。上記合計含有量が少ないほど、上記導電性の低下を抑制し易いことから、300ppm以下、更に200ppm以下、100ppm以下とすることができる。
If the total content is 10 ppm or more, oxidation of the above-described elements can be prevented. The greater the total content, the easier it is to obtain an antioxidant effect, and it can be 20 ppm or more, and more preferably 30 ppm or more.
If said total content is 500 ppm or less, it will be difficult to cause the fall of the electroconductivity by excess containing of these deoxidizer elements, and it will be excellent in electroconductivity. The smaller the total content is, the easier it is to suppress the decrease in conductivity, so that it can be made 300 ppm or less, further 200 ppm or less, or 100 ppm or less.
 Cのみの含有量は、10ppm以上300ppm以下、更に10ppm以上200ppm以下、30ppm以上150ppm以下が好ましい。
 Mnのみの含有量、又はSiのみの含有量は、5ppm以上100ppm以下、更に5ppm超50ppm以下が好ましい。Mn及びSiの合計含有量は、10ppm以上200ppm以下、更に10ppm超100ppm以下が好ましい。
 C,Mn,Siをそれぞれ上述の範囲で含有すると、上述のFeなどの元素の酸化防止効果を良好に得易い。例えば、銅合金中の酸素の含有量を20ppm以下、15ppm以下、更に10ppm以下とすることができる。
The content of C alone is preferably 10 ppm to 300 ppm, more preferably 10 ppm to 200 ppm, and 30 ppm to 150 ppm.
The content of only Mn or the content of only Si is preferably 5 ppm or more and 100 ppm or less, more preferably more than 5 ppm and 50 ppm or less. The total content of Mn and Si is preferably 10 ppm or more and 200 ppm or less, more preferably more than 10 ppm and 100 ppm or less.
When C, Mn, and Si are contained in the above ranges, the above-described antioxidant effect of elements such as Fe can be easily obtained satisfactorily. For example, the content of oxygen in the copper alloy can be 20 ppm or less, 15 ppm or less, and further 10 ppm or less.
(組織)
 実施形態のコネクタ端子用線材を構成する銅合金の組織として、FeとTiとを含む析出物や晶出物が分散する組織が挙げられる。このような組織を有することで、析出強化による高強度化、TiなどのCuへの固溶の低減による高い導電率の確保を期待できる。
(Organization)
Examples of the structure of the copper alloy constituting the connector terminal wire of the embodiment include a structure in which precipitates and crystallized substances containing Fe and Ti are dispersed. By having such a structure, it can be expected to increase the strength by precipitation strengthening and to secure a high conductivity by reducing the solid solution of Cu such as Ti.
(断面形状)
 実施形態のコネクタ端子用線材の横断面形状は、素材として供するコネクタ端子の形状などに応じて適宜選択できる。代表的には、横断面形状が長方形や正方形などの四角形である角線が挙げられる。横断面形状は、塑性加工条件を調整することで変更できる。例えば、ダイスを用いる場合にはダイス形状を適宜選択することで、上記角線の他、横断面形状が円形状や楕円形状、六角形などの多角形状などの線材とすることができる。
(Cross-sectional shape)
The cross-sectional shape of the connector terminal wire of the embodiment can be appropriately selected according to the shape of the connector terminal provided as a material. A typical example is a square line whose cross-sectional shape is a quadrangle such as a rectangle or a square. The cross-sectional shape can be changed by adjusting the plastic working conditions. For example, in the case of using a die, by appropriately selecting the die shape, in addition to the above-mentioned square line, the cross-sectional shape can be a wire material such as a circular shape, an elliptical shape, or a polygonal shape such as a hexagonal shape.
(大きさ)
 実施形態のコネクタ端子用線材の大きさは、素材として供するコネクタ端子が得られる範囲で適宜選択できる。例えば、素材である線材からプレスフィット端子を製造する場合、この線材を切削して、所定の形状、大きさに切り出すことがある。このようなコネクタ端子の素材に利用する場合には、切削除去分を含んだ大きさにするとよい。例えば、コネクタ端子用線材の横断面積が0.1mm以上2.0mm以下を満たすものとしたり、上述の角線では、幅が0.1mm以上3.0mm以下程度、厚さが0.1mm以上3.0mm以下程度を満たすものとしたりすることができる。
(size)
The magnitude | size of the wire for connector terminals of embodiment can be suitably selected in the range from which the connector terminal provided as a raw material is obtained. For example, when a press-fit terminal is manufactured from a wire that is a material, the wire may be cut into a predetermined shape and size. When used as a material for such a connector terminal, it is preferable to have a size including the amount removed by cutting. For example, the cross-sectional area of the connector terminal wire should satisfy 0.1 mm 2 or more and 2.0 mm 2 or less, and the above-mentioned square wire has a width of about 0.1 mm or more and 3.0 mm or less and a thickness of 0.1 mm. It is possible to satisfy about 3.0 mm or less.
(特性)
 実施形態のコネクタ端子用線材は、上述の特定の組成の銅合金で構成されて、導電性及び強度の双方に優れる。定量的には、コネクタ端子用線材は、導電率が40%IACS以上、及び引張強さが600MPa以上の少なくとも一方、好ましくは双方を満たすことが挙げられる。
 より高導電率を望む場合には、導電率を45%IACS以上、更に48%IACS以上、50%IACS以上とすることができる。
 より高強度を望む場合には、引張強さを620MPa以上、更に640MPa以上、660MPa以上、680MPa以上とすることができる。
(Characteristic)
The wire for connector terminals of the embodiment is composed of the copper alloy having the specific composition described above, and is excellent in both conductivity and strength. Quantitatively, it is mentioned that the connector terminal wire satisfies at least one, preferably both, having a conductivity of 40% IACS or more and a tensile strength of 600 MPa or more.
When higher conductivity is desired, the conductivity can be 45% IACS or more, 48% IACS or more, 50% IACS or more.
When higher strength is desired, the tensile strength can be 620 MPa or more, further 640 MPa or more, 660 MPa or more, or 680 MPa or more.
 実施形態のコネクタ端子用線材は、上述の特定の組成の銅合金で構成されることで高温に長時間保持されても応力緩和し難い。定量的には、コネクタ端子用線材は、150℃で1000時間保持した後の応力緩和率が30%以下である形態が挙げられる。このときの応力緩和試験における曲げ応力は、例えば、0.2%耐力の50%とすることが挙げられる。このようなコネクタ端子用線材によって構成されたコネクタ端子は、仮に使用時に150℃程度の高温に長時間保持されても、プリント基板などとの電気的及び機械的な接続状態を良好に維持できる。即ち、このコネクタ端子用線材であれば、高導電率かつ高強度である上に応力緩和性にも優れるコネクタ端子を構築できる。
 応力緩和性により優れることを望む場合には、上記応力緩和率を28%以下、更に25%以下とすることができる。応力緩和率の測定方法は後述する。
The connector terminal wire according to the embodiment is made of the copper alloy having the specific composition described above, so that it is difficult to relieve stress even if it is held at a high temperature for a long time. Quantitatively, the connector terminal wire has a form in which the stress relaxation rate after being held at 150 ° C. for 1000 hours is 30% or less. The bending stress in the stress relaxation test at this time is, for example, 50% of the 0.2% proof stress. Even if the connector terminal constituted by such a wire for a connector terminal is kept at a high temperature of about 150 ° C. for a long time during use, it can maintain a good electrical and mechanical connection with a printed circuit board. That is, with this connector terminal wire, it is possible to construct a connector terminal that has high conductivity, high strength, and excellent stress relaxation properties.
When it is desired to be more excellent in stress relaxation, the stress relaxation rate can be 28% or less, and further 25% or less. A method for measuring the stress relaxation rate will be described later.
 導電率、引張強さ、応力緩和率などは、組成や製造条件を調整することで所定の大きさにすることができる。例えば、Fe,Ti,適宜Mgといった元素を多くしたり、伸線加工度を高めたり(細くしたり)すると、引張強さが高くなる傾向にある。例えば、加工途中に熱処理を行うと、導電率を高められる場合がある(後述の試験例1、軟化処理を行う試料参照)。引張強さなどを高めると、応力緩和率が高くなる傾向にある。 The electrical conductivity, tensile strength, stress relaxation rate, and the like can be set to predetermined sizes by adjusting the composition and manufacturing conditions. For example, if the number of elements such as Fe, Ti, and Mg is increased, or the degree of wire drawing is increased (thinned), the tensile strength tends to increase. For example, when heat treatment is performed during processing, the electrical conductivity may be increased (see Test Example 1 described later, sample for softening treatment). When the tensile strength is increased, the stress relaxation rate tends to increase.
(表面層)
 実施形態のコネクタ端子用線材は、そのままでもプレスフィット端子などのコネクタ端子の素材に利用できる。実施形態のコネクタ端子用線材を、その表面の少なくとも一部にめっき層を備えるめっき付線材とすることができる。めっき付線材を素材に用いることでめっき付コネクタ端子を容易に製造でき、めっき付コネクタ端子の製造性の向上に寄与する。めっき付コネクタ端子におけるめっきが望まれる箇所にのみ、めっき層を備えるめっき付線材とすることができるが、表面全体にめっき層を備えるめっき付線材とすると、めっき作業を行い易く、製造性に優れる。表面全体にめっき層を備えるめっき付線材の製造過程では、最終形状、最終の大きさの線材にめっき層を形成することができる。一方、最終以前の段階の素材にめっきを施し、このめっき後に最終形状、最終の大きさなどにする塑性加工を施すことができる。この場合、めっきの対象が単純な形状で比較的大きな素材となることで、めっきを施し易く、均一的な厚さのめっき層を備えるめっき付線材を得易い。
(Surface layer)
The connector terminal wire of the embodiment can be used as it is for a connector terminal material such as a press-fit terminal. The wire for connector terminals of the embodiment can be a wire with plating provided with a plating layer on at least a part of its surface. By using a plated wire as a raw material, a plated connector terminal can be easily manufactured, which contributes to an improvement in manufacturability of the plated connector terminal. A plated wire with a plating layer can be provided only at a place where plating is desired in a connector terminal with plating. However, if a plated wire with a plating layer on the entire surface is used, the plating operation is easy and the productivity is excellent. . In the manufacturing process of the wire with plating provided with the plating layer on the entire surface, the plating layer can be formed on the wire having the final shape and the final size. On the other hand, the material before the final stage can be plated, and after this plating, plastic working to obtain the final shape and final size can be performed. In this case, since the object to be plated is a relatively large material with a simple shape, it is easy to perform plating, and it is easy to obtain a wire with plating provided with a plating layer having a uniform thickness.
 上述のめっき付コネクタ端子におけるめっき層は、コネクタ端子の接続対象(例えば、プリント基板のスルーホール部分などの導体、代表的には銅又は銅合金から構成される)に密着して、良好な導通状態を確保することに機能する。そのため、めっき付線材のめっき層の構成金属は、この機能を有するものが好適に利用できる。特に、Sn及びAgの少なくとも一方を含むめっき層を備えると、コネクタ端子との密着性、コネクタ端子の接続対象との密着性に優れて好ましい。具体的には、錫、錫合金、銀、及び銀合金から選択される1種の金属から構成されるめっき層を含むことが挙げられる。SnやAgを含むめっき層の下地層として、ニッケルめっき層及び銅めっき層の少なくとも一方などを備えることができる。 The plating layer in the above-mentioned connector terminal with plating is in close contact with the connection target of the connector terminal (for example, a conductor such as a through-hole portion of a printed circuit board, typically composed of copper or a copper alloy), and good conduction It works to ensure state. Therefore, what has this function can be used suitably for the constituent metal of the plating layer of the wire with plating. In particular, it is preferable to provide a plating layer containing at least one of Sn and Ag because of excellent adhesion to the connector terminal and adhesion to the connection target of the connector terminal. Specifically, it includes a plating layer composed of one kind of metal selected from tin, tin alloy, silver, and silver alloy. As a base layer for the plating layer containing Sn or Ag, at least one of a nickel plating layer and a copper plating layer can be provided.
 めっき層の厚さ(上述の下地層を備える場合には下地層とめっき層との合計厚さ)は、適宜選択でき、例えば、0.3μm以上5μm以下程度が挙げられる。この範囲であれば、めっき層の具備による上述の良好な密着性を有することができると共に、厚過ぎによる剥離を抑制して、めっき層を維持し易い。 The thickness of the plating layer (the total thickness of the base layer and the plating layer in the case where the above-described base layer is provided) can be selected as appropriate, and examples thereof include about 0.3 μm to 5 μm. If it is this range, while being able to have the above-mentioned favorable adhesiveness by the provision of a plating layer, peeling by excessive thickness is suppressed and it is easy to maintain a plating layer.
(用途)
 実施形態のコネクタ端子用線材は、各種のコネクタ端子の素材に利用できる。特に、プレスフィット端子などの素材に利用できる。コネクタ端子には、導電性に優れる上に、剛性やばね性に優れること、換言すれば強度に優れることが望まれるため、実施形態のコネクタ端子用線材は、これらの素材に好適である。その他、導電性及び強度の双方に優れることが望まれる各種の分野への利用が期待できる。
(Use)
The wire for connector terminals of the embodiment can be used as a material for various connector terminals. In particular, it can be used for materials such as press-fit terminals. Since it is desired that the connector terminal is excellent in conductivity, rigidity and springiness, in other words, strength is desired, the connector terminal wire of the embodiment is suitable for these materials. In addition, it can be expected to be used in various fields where it is desired to be excellent in both conductivity and strength.
[効果]
 実施形態のコネクタ端子用線材は、特定の組成の銅合金で構成されることで、導電性に優れる上に、高強度である。この効果を試験例1で具体的に説明する。このようなコネクタ端子用線材をコネクタ端子の素材に利用して、切削加工などを適宜施すことで、導電性に優れる上に、高強度なコネクタ端子を提供できる。また、高強度であることで、応力緩和性にも優れるコネクタ端子を提供できると期待される。
[effect]
The connector terminal wire according to the embodiment is made of a copper alloy having a specific composition, so that it has excellent conductivity and high strength. This effect will be specifically described in Test Example 1. By using such a wire for a connector terminal as a material for the connector terminal and appropriately performing cutting or the like, it is possible to provide a high-strength connector terminal in addition to excellent conductivity. Moreover, it is expected that a connector terminal that is excellent in stress relaxation property can be provided because of its high strength.
[製造方法]
 実施形態のコネクタ端子用線材は、例えば、以下の工程を備える製造方法によって製造することができる。以下、各工程の概要を列挙し、その後に工程ごとに詳細に説明する。
[Production method]
The wire for connector terminals of the embodiment can be manufactured by a manufacturing method including the following steps, for example. Hereafter, the outline | summary of each process is enumerated and it demonstrates in detail for every process after that.
<連続鋳造工程>上述の特定の組成の銅合金の溶湯を連続鋳造して鋳造材を製造する。
<伸線工程>上記鋳造材、又は上記鋳造材に加工を施した加工材に、伸線加工を施して所定の大きさの伸線材を製造する。
<成形工程>上記所定の大きさの伸線材に塑性加工を施して、所定の形状のコネクタ端子用線材を製造する。
<熱処理工程>上記<連続鋳造工程>以降、<成形工程>前の素材に時効処理を施す。
<Continuous Casting Process> A cast material is produced by continuously casting a molten copper alloy having a specific composition described above.
<Wire Drawing Process> A wire drawing material having a predetermined size is manufactured by drawing the cast material or a processed material obtained by processing the cast material.
<Molding step> A predetermined shape of the wire rod for connector terminals is produced by plastic working.
<Heat treatment step> After the above <continuous casting step>, the material before the <molding step> is subjected to an aging treatment.
 上述のめっき層を備えるコネクタ端子用線材を製造する場合には、例えば、<成形工程>前、又は<成形工程>後に、以下の<めっき工程>を備える。
<めっき工程>対象となる線材の表面の少なくとも一部に、Sn及びAgの少なくとも一方を含むめっき層を形成して、めっき付線材を製造する。
When manufacturing the connector terminal wire provided with the above-described plating layer, for example, the following <plating step> is provided before <molding step> or after <molding step>.
<Plating step> A plated layer containing at least one of Sn and Ag is formed on at least a part of the surface of the target wire to produce a plated wire.
 その他、<伸線工程>前、<成形工程>前、伸線加工が多パスの場合に伸線加工の途中などに、対象となる素材に中間熱処理を施すことができる。 In addition, intermediate heat treatment can be performed on the target material before <drawing step>, before <forming step>, in the middle of the drawing process when the drawing process is multi-pass.
<連続鋳造工程>
 この工程では、上述したFe,Ti,適宜Mgを特定の範囲で含む特定の組成の銅合金の溶湯を連続鋳造して鋳造材を作製する。ここで、溶解時の雰囲気を真空雰囲気とすると、Fe,Tiなどの元素の酸化を防止できる。一方、溶解時の雰囲気を大気雰囲気とすると、雰囲気制御が不要であり、生産性を向上できる。この場合、雰囲気中の酸素による上記元素の酸化防止のために、上述の脱酸剤元素(C,Mn,Si)を利用することが好ましい。
<Continuous casting process>
In this process, a cast material is produced by continuously casting a molten copper alloy having a specific composition containing Fe, Ti, and Mg as appropriate in a specific range. Here, if the atmosphere during melting is a vacuum atmosphere, oxidation of elements such as Fe and Ti can be prevented. On the other hand, if the atmosphere at the time of melting is an air atmosphere, atmosphere control is unnecessary and productivity can be improved. In this case, it is preferable to use the deoxidizer element (C, Mn, Si) described above in order to prevent oxidation of the element by oxygen in the atmosphere.
 C(炭素)の添加方法は、例えば、上記溶湯の湯面を木炭片や木炭粉などで覆うことが挙げられる。この場合、湯面近傍の木炭片や木炭粉などから溶湯中にCを供給できる。
 MnやSiは、これらを含む原料を別途用意して、上記溶湯中に混合することが挙げられる。この場合、上記湯面における木炭片や木炭粉などがつくる隙間から露出する箇所が雰囲気中の酸素に接触しても、湯面近傍での酸化を抑制できる。上記原料には、MnやSiの単体、MnやSiとFeとの合金などが挙げられる。
Examples of the method for adding C (carbon) include covering the molten metal surface with charcoal pieces or charcoal powder. In this case, C can be supplied into the molten metal from charcoal pieces or charcoal powder in the vicinity of the hot water surface.
For Mn and Si, raw materials containing these may be prepared separately and mixed in the molten metal. In this case, even if a portion exposed from a gap formed by charcoal pieces or charcoal powder on the hot water surface comes into contact with oxygen in the atmosphere, oxidation near the hot water surface can be suppressed. Examples of the raw material include simple substances of Mn and Si, and alloys of Mn, Si and Fe.
 上述の脱酸剤元素の添加に加えて、坩堝や鋳型として、不純物が少ない高純度カーボン製のものを利用すると、溶湯に不純物が混入され難く、好ましい。 In addition to the addition of the deoxidizer element described above, it is preferable to use a high-purity carbon made of few impurities as a crucible or a mold because impurities are hardly mixed into the molten metal.
 ここで、実施形態のコネクタ端子用線材は、代表的には、Fe及びTiを析出物として存在させ、Mgを含む場合にはMgを固溶体として存在させる。そのため、コネクタ端子用線材の製造過程では、過飽和固溶体を形成する過程を備えることが好ましい。例えば、過飽和固溶体を形成する溶体化処理を行う溶体化工程を別途設けると、任意の時期に過飽和固溶体を形成できる。一方、連続鋳造を行う場合に冷却速度を大きくして過飽和固溶体の鋳造材を作製すれば、別途、溶体化工程を設けることなく、最終的に電気的特性及び機械的特性に優れる銅合金線を製造できる。製造工程を低減できることで、製造性にも優れる。そこで、コネクタ端子用線材の製造方法として、連続鋳造を行うこと、特に冷却過程で冷却速度を大きく急冷することを提案する。 Here, the connector terminal wire of the embodiment typically includes Fe and Ti as precipitates, and when Mg is included, Mg is present as a solid solution. Therefore, it is preferable that the manufacturing process of the connector terminal wire includes a process of forming a supersaturated solid solution. For example, if a solution treatment step for performing a solution treatment for forming a supersaturated solid solution is separately provided, the supersaturated solid solution can be formed at an arbitrary time. On the other hand, if the casting rate of the supersaturated solid solution is produced by increasing the cooling rate when performing continuous casting, a copper alloy wire that finally has excellent electrical and mechanical properties can be obtained without providing a separate solution treatment step. Can be manufactured. Since the manufacturing process can be reduced, the productivity is excellent. Therefore, as a manufacturing method of the connector terminal wire, it is proposed to perform continuous casting, particularly to rapidly cool the cooling rate during the cooling process.
 連続鋳造法は、ベルトアンドホイール法、双ベルト法、アップキャスト法など各種の方法が利用できる。特に、アップキャスト法は、酸素などの不純物を低減できて、CuやFe,Tiなどの元素の酸化を防止し易く好ましい。冷却過程の冷却速度は、5℃/sec超、更に10℃/sec超、15℃/sec以上が好ましい。 For the continuous casting method, various methods such as a belt-and-wheel method, a twin belt method, and an upcast method can be used. In particular, the upcast method is preferable because it can reduce impurities such as oxygen and easily prevent oxidation of elements such as Cu, Fe, and Ti. The cooling rate in the cooling process is preferably more than 5 ° C / sec, more preferably more than 10 ° C / sec, and more than 15 ° C / sec.
 鋳造材には、各種の塑性加工、切削加工などの加工を施すことができる。塑性加工は、コンフォーム押出、圧延(熱間、温間、冷間)などが挙げられる。切削加工は、皮剥ぎなどが挙げられる。これらの加工を施すことで、鋳造材の表面欠陥を低減できて、伸線加工時に断線などを低減して、生産性を向上できる。特に、アップキャスト材には、これらの加工を施すと上述の断線などし難い。 The cast material can be subjected to various types of plastic processing and cutting. Examples of the plastic working include conform extrusion, rolling (hot, warm, cold) and the like. Examples of the cutting process include peeling. By performing these processes, it is possible to reduce the surface defects of the cast material, to reduce disconnection during the wire drawing process, and to improve productivity. In particular, the above-described disconnection is difficult to be applied to the upcast material when these processes are performed.
 伸線前の上記加工材、伸線途中の中間伸線材、伸線後の伸線材などに以下の条件で、上述の中間熱処理を施すことができる。
 上記加工材の断面積は最終寸法の線材に比較して比較的大きい(太い)ため、この熱処理は、加熱対象全体の加熱状態を管理し易いバッチ処理が利用し易いと考えられる。上述の中間伸線材や伸線材は、断面が比較的小さいことから、連続処理を利用してもよい。
{中間熱処理条件}
(熱処理温度)400℃以上550℃以下、好ましくは450℃以上500℃以下
(保持時間)4時間以上16時間以下、好ましくは4時間以上10時間以下
The intermediate heat treatment described above can be performed on the processed material before drawing, the intermediate drawn material in the middle of drawing, the drawn material after drawing, and the like under the following conditions.
Since the cross-sectional area of the processed material is relatively large (thick) compared to the final size wire, it is considered that this heat treatment can be easily used for batch processing that can easily manage the heating state of the entire heating target. Since the above-mentioned intermediate wire drawing material and wire drawing material have a relatively small cross section, continuous processing may be used.
{Intermediate heat treatment conditions}
(Heat treatment temperature) 400 ° C. to 550 ° C., preferably 450 ° C. to 500 ° C. (holding time) 4 hours to 16 hours, preferably 4 hours to 10 hours
 上記の中間熱処理は、以降に行う伸線加工などの塑性加工が行い易いように、加工に伴う歪みを除去したり、軟化したりすること、即ち、加工性の向上を目的の一つとする。この目的のもと、組成などに応じて、上記の範囲から温度及び時間を選択するとよい。上記歪みの除去などによって、導電率の回復も期待でき、中間熱処理以降に伸線加工などの塑性加工を行った場合でも、高い導電率を有することが期待できる。なお、中間熱処理後に皮剥ぎなどを行うと、熱処理に起因する表面欠陥を低減できる。 The above-mentioned intermediate heat treatment is intended to remove distortion or soften during processing, that is, to improve workability so that plastic processing such as wire drawing performed thereafter can be easily performed. For this purpose, the temperature and time may be selected from the above ranges depending on the composition and the like. By removing the strain and the like, it can be expected that the electrical conductivity is restored, and even when plastic processing such as wire drawing is performed after the intermediate heat treatment, it can be expected to have high electrical conductivity. Note that when surface peeling or the like is performed after the intermediate heat treatment, surface defects due to the heat treatment can be reduced.
<伸線工程>
 この工程では、代表的には上記鋳造材や上記加工材、この加工材に上述の中間熱処理が施された中間熱処理材などに、少なくとも1パス、代表的には複数パスの伸線加工(冷間)を施して、所定の大きさの伸線材を作製する。複数パスを行う場合、パスごとの加工度は、組成や上記所定の大きさなどに応じて適宜調整するとよい。また、複数パスを行う場合、パス間に上述の中間熱処理を行うことができる。この場合、上述のように加工性を高められる。この中間熱処理も、組成などに応じて、上述の範囲から温度及び時間を選択するとよい。
<Wire drawing process>
In this process, typically, the cast material, the processed material, the intermediate heat-treated material obtained by subjecting the processed material to the intermediate heat treatment described above, at least one pass, typically a plurality of passes of wire drawing (cooling). To obtain a wire drawing material of a predetermined size. When performing a plurality of passes, the degree of processing for each pass may be appropriately adjusted according to the composition, the predetermined size, and the like. When performing a plurality of passes, the above-described intermediate heat treatment can be performed between passes. In this case, workability can be improved as described above. In this intermediate heat treatment, the temperature and time may be selected from the above-mentioned ranges depending on the composition and the like.
<成形工程>
 この工程は、塑性加工によって、最終形状のコネクタ端子用線材を製造する。この塑性加工は、圧延加工などとすることができるが、所定の形状のダイスを用いた伸線加工とすることができる。この場合、長尺なコネクタ端子用線材を連続的に製造でき、量産に適する。上記ダイスとして、例えば、四角形状の貫通孔を有する異形ダイスを利用すれば、横断面形状が四角形である角線を製造できる。
<Molding process>
In this step, a connector terminal wire having a final shape is manufactured by plastic working. This plastic working can be a rolling process or the like, but can be a wire drawing process using a die having a predetermined shape. In this case, a long connector terminal wire can be manufactured continuously, which is suitable for mass production. For example, if a deformed die having a quadrangular through hole is used as the die, a square wire having a quadrangular cross section can be manufactured.
 成形工程に供する上記伸線材の大きさは、最終形状のコネクタ端子用線材の大きさに近いものが好ましい。この場合、最終形状にするまでの加工度を小さくでき、加工に伴って導入される歪みを低減して、高い導電率を有するコネクタ端子用線材を製造できる。成形工程前に上述の中間熱処理を行うことができる。この場合、成形工程での加工性に優れて、所定の最終形状及び所定の大きさのコネクタ端子用線材を精度よく成形できながら、加工硬化による強度向上効果によって、高い強度を有することができる。 The size of the wire drawing material used for the forming step is preferably close to the size of the final connector terminal wire. In this case, the degree of processing up to the final shape can be reduced, distortion introduced with the processing can be reduced, and a connector terminal wire having high conductivity can be manufactured. The intermediate heat treatment described above can be performed before the molding step. In this case, it is excellent in workability in the forming step, and it is possible to form a connector terminal wire having a predetermined final shape and a predetermined size with high accuracy, while having high strength due to an effect of improving strength by work hardening.
<熱処理工程>
 この工程では、素材(代表的には過飽和固溶体)からFeやTiを含む析出物を析出させる人工時効を主たる目的として熱処理(時効処理)を施す。この熱処理によって、上記の析出物などの析出強化による強度向上効果と、Cuへの固溶低減による高い導電率の維持効果とを良好に図ることができる。また、この熱処理によって、ある程度の軟化も期待でき、この熱処理以降に伸線加工などの塑性加工を行う場合に加工性に優れる。
<Heat treatment process>
In this step, heat treatment (aging treatment) is performed mainly for the purpose of artificial aging in which precipitates containing Fe and Ti are precipitated from a raw material (typically a supersaturated solid solution). By this heat treatment, it is possible to satisfactorily achieve the effect of improving the strength by precipitation strengthening of the precipitates and the like and the effect of maintaining high conductivity by reducing the solid solution in Cu. In addition, this heat treatment can be expected to be softened to some extent, and is excellent in workability when plastic processing such as wire drawing is performed after this heat treatment.
 上記熱処理(時効処理)は、上述の連続鋳造工程以降であれば、任意の時期に施すことができる。具体的な実施時期は、<伸線工程>前(熱処理対象:上記鋳造材又は上記加工材)、伸線途中(熱処理対象:中間伸線材)、<伸線工程>直後(熱処理対象:所定の大きさの伸線材)、<成形工程>後(熱処理対象:所定の形状の線材)などが挙げられる。特に実施時期は、<成形工程>前が好ましい。 The heat treatment (aging treatment) can be performed at any time as long as it is after the above-described continuous casting process. Specific implementation time is before <drawing process> (heat treatment target: cast material or processed material), in the middle of wire drawing (heat treatment target: intermediate wire drawing material), immediately after <drawing process> (heat treatment target: predetermined Size wire drawing), after <forming step> (heat treatment object: wire having a predetermined shape) and the like. In particular, the implementation time is preferably before <molding step>.
 上記熱処理の条件(時効条件)は、上述のように加熱状態を管理し易いバッチ処理が利用し易いと考えられ、例えば以下が挙げられる。
{時効条件}
(熱処理温度)400℃以上600℃以下、好ましくは450℃以上550℃以下
(保持時間)4時間以上16時間以下、好ましくは4時間以上10時間以下
 上記の範囲から、組成(添加元素の種類、含有量)、加工状態などに応じて選択するとよい。具体例として、後述の試験例1を参照するとよい。
The heat treatment conditions (aging conditions) are considered to be easy to use batch processing that easily manages the heating state as described above, and examples thereof include the following.
{Aging conditions}
(Heat treatment temperature) 400 ° C. to 600 ° C., preferably 450 ° C. to 550 ° C. (holding time) 4 hours to 16 hours, preferably 4 hours to 10 hours or less From the above range, the composition (type of additive element, Content), processing state, and the like. As a specific example, reference may be made to Test Example 1 described later.
<めっき工程>
 上述の<成形工程>前の素材にめっき層を形成する場合、例えば、断面円形状の丸線の伸線材などにめっき層を形成できる。この場合、めっき対象が単純な形状である上に、ある程度太いため、均一的な厚さのめっき層を精度よく形成し易く、製造性に優れる。
 上述の<成形工程>後の最終形状の線材にめっき層を形成する場合、成形工程で塑性加工を受けた際に、めっき層を損傷する恐れが無い。
<Plating process>
In the case where the plating layer is formed on the material before the above <molding step>, for example, the plating layer can be formed on a round wire drawing material having a circular cross section. In this case, since the plating target has a simple shape and is thick to some extent, it is easy to form a plating layer having a uniform thickness with high accuracy, and the productivity is excellent.
When the plating layer is formed on the wire having the final shape after the above-described <forming step>, there is no possibility of damaging the plating layer when subjected to plastic working in the forming step.
 めっき層の形成は、所望の組成に応じて、電気めっきや化学(無電解)めっきなど公知の手法が利用できる。上述のように下地層を形成してもよい。めっき層の厚さは、最終的な厚さが所定の厚さとなるように調整するとよい。 For the formation of the plating layer, a known method such as electroplating or chemical (electroless) plating can be used depending on the desired composition. A base layer may be formed as described above. The thickness of the plating layer may be adjusted so that the final thickness becomes a predetermined thickness.
[試験例1]
 種々の組成の銅合金線を種々の製造条件で作製して、特性を調べた。
[Test Example 1]
Copper alloy wires having various compositions were produced under various production conditions, and the characteristics were examined.
 銅合金線は、以下に示す3つの製造パターン(A),(B),(C)によって製造した。いずれの製造パターンにおいても、以下の鋳造材を用意した。 The copper alloy wire was manufactured by the following three manufacturing patterns (A), (B), and (C). In any manufacturing pattern, the following casting materials were prepared.
(鋳造材)
 電気銅(純度99.99%以上)と、表1に示す各元素を含有する母合金、又は各元素単体とを原料として用意した。用意した原料を高純度カーボン製の坩堝(不純物量が20質量ppm以下)を用いて、大気溶解して銅合金の溶湯を作製した。銅合金の組成(残部Cu及び不純物)を表1に示す。
 上記の銅合金の溶湯と、高純度カーボン製鋳型(不純物量が20質量ppm以下)とを用いて、アップキャスト法によって、以下の線径の断面円形状の鋳造材を作製した。冷却速度は、10℃/sec超とした。
(Casting material)
Electrolytic copper (purity 99.99% or more) and a mother alloy containing each element shown in Table 1 or each element simple substance were prepared as raw materials. The prepared raw material was melted in the air using a high-purity carbon crucible (impurity amount of 20 ppm by mass or less) to prepare a molten copper alloy. Table 1 shows the composition of the copper alloy (remainder Cu and impurities).
Using the above-described molten copper alloy and a high-purity carbon mold (impurity amount of 20 ppm by mass or less), a cast material having a circular cross section with the following wire diameter was produced by an upcast method. The cooling rate was over 10 ° C./sec.
 この試験では、炭素源として木炭片、Si源及びMn源としてSi及びMnを含む鉄合金を用意した。そして、上記溶湯の湯面を上記木炭片で十分に覆い、湯面が大気に接触しないようにした。木炭片と湯面との接触によって、Cが溶湯に混入する量が表1に示す「微量元素」の「C」の量(質量ppm)となるように、木炭片の量を調整した。
 上記溶湯に対するSi,Mnの含有量が表1に示す「微量元素」の「Si」、「Mn」の量(質量ppm)となるように、鉄合金の量を調整して溶湯に混合した。
In this test, an iron alloy containing charcoal pieces as a carbon source, Si and Mn as Si sources and Mn sources was prepared. Then, the molten metal surface was sufficiently covered with the charcoal pieces so that the molten metal surface did not come into contact with the atmosphere. The amount of charcoal pieces was adjusted so that the amount of C mixed into the molten metal became the amount (mass ppm) of “C” of “trace element” shown in Table 1 by the contact between the charcoal pieces and the molten metal surface.
The amount of the iron alloy was adjusted and mixed with the molten metal so that the contents of Si and Mn with respect to the molten metal became the amounts (mass ppm) of “Si” and “Mn” of “trace elements” shown in Table 1.
(銅合金線の製造パターン)
(A)連続鋳造(線径φ12.5mm)
  ⇒コンフォーム押出(線径φ9.5mm)
  ⇒伸線加工(線径φ2.6mm又はφ1.6mm)
  ⇒熱処理(表1の時効処理の条件)
  ⇒伸線加工(線径φ1.0mm)
  ⇒中間熱処理(表1の軟化処理の条件)
  ⇒成形(異形ダイスを用いた角伸線加工、0.64mm×0.64mm、又は縦0.64mm×横1.50mm)
  ⇒錫めっき層の形成(厚さ1.5μm)
(B)連続鋳造(線径φ12.5mm)
  ⇒冷間圧延(線径φ9.5mm)
  ⇒中間熱処理(温度:400℃~550℃から選択、保持時間:4~16時間から選択)
  ⇒皮剥ぎ(線径φ8mm)
  ⇒伸線加工(線径φ2.6mm又はφ1.6mm)
  ⇒熱処理(表1の時効処理の条件)
  ⇒伸線加工(線径φ1.0mm)
  ⇒中間熱処理(表1の軟化処理の条件)
  ⇒成形(異形ダイスを用いた角伸線加工、0.64mm×0.64mm、又は縦0.64mm×横1.50mm)
  ⇒錫めっき層の形成(厚さ1.5μm)
(C)連続鋳造(線径φ12.5mm)
  ⇒伸線加工(線径φ9.5mm)
  ⇒皮剥ぎ(線径φ8mm)
  ⇒伸線加工(線径φ2.6mm)
  ⇒熱処理(表1の時効処理の条件)
  ⇒伸線加工(線径φ1.0mm)
  ⇒中間熱処理(表1の軟化処理の条件)
  ⇒成形(異形ダイスを用いた角伸線加工、0.64mm×0.64mm、又は縦0.64mm×横1.50mm)
  ⇒錫めっき層の形成(厚さ1.5μm)
(Manufacturing pattern of copper alloy wire)
(A) Continuous casting (wire diameter φ12.5mm)
⇒Conform extrusion (wire diameter φ9.5mm)
⇒Drawing (Wire diameter φ2.6mm or φ1.6mm)
⇒ Heat treatment (conditions for aging treatment in Table 1)
⇒ Wire drawing (Wire diameter φ1.0mm)
⇒ Intermediate heat treatment (conditions for softening treatment in Table 1)
⇒ Molding (Square wire drawing using deformed dies, 0.64mm x 0.64mm, or 0.64mm x 1.50mm x width)
⇒ Formation of tin plating layer (thickness 1.5μm)
(B) Continuous casting (wire diameter φ12.5mm)
⇒Cold rolling (Wire diameter φ9.5mm)
⇒ Intermediate heat treatment (Temperature: Select from 400 ° C to 550 ° C, Retention time: Select from 4 to 16 hours)
⇒Peeling (wire diameter φ8mm)
⇒Drawing (Wire diameter φ2.6mm or φ1.6mm)
⇒ Heat treatment (conditions for aging treatment in Table 1)
⇒ Wire drawing (Wire diameter φ1.0mm)
⇒ Intermediate heat treatment (conditions for softening treatment in Table 1)
⇒ Molding (Square wire drawing using deformed dies, 0.64mm x 0.64mm, or 0.64mm x 1.50mm x width)
⇒ Formation of tin plating layer (thickness 1.5μm)
(C) Continuous casting (wire diameter φ12.5mm)
⇒ Wire drawing (Wire diameter φ9.5mm)
⇒Peeling (wire diameter φ8mm)
⇒ Wire drawing (Wire diameter φ2.6mm)
⇒ Heat treatment (conditions for aging treatment in Table 1)
⇒ Wire drawing (Wire diameter φ1.0mm)
⇒ Intermediate heat treatment (conditions for softening treatment in Table 1)
⇒ Molding (Square wire drawing using deformed dies, 0.64mm x 0.64mm, or 0.64mm x 1.50mm x width)
⇒ Formation of tin plating layer (thickness 1.5μm)
 製造パターン(A),(B),(C)において、表1に軟化処理の条件が記載されている試料については、表1に示す線径のときに、表1に示す条件で中間熱処理(軟化処理)を施した。この中間熱処理は省略することができる(表1において軟化処理の欄が「-」である試料参照)。 In the production patterns (A), (B), (C), for samples whose softening treatment conditions are listed in Table 1, intermediate heat treatment ( Softening treatment). This intermediate heat treatment can be omitted (see the sample whose softening column is “-” in Table 1).
 製造パターン(A),(B),(C)によって製造した銅合金線について、引張強さ(MPa)、導電率(%IACS)を調べた。結果を表2に示す。 The tensile strength (MPa) and electrical conductivity (% IACS) were investigated about the copper alloy wire manufactured by manufacturing pattern (A), (B), (C). The results are shown in Table 2.
 引張強さ(MPa)は、JIS Z 2241(金属材料引張試験方法、1998)に準拠して、汎用の引張試験機を用いて測定した。導電率(%IACS)は、ブリッジ法によって測定した。 Tensile strength (MPa) was measured using a general-purpose tensile tester in accordance with JIS Z 2241 (metal material tensile test method, 1998). The conductivity (% IACS) was measured by the bridge method.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
 以下の説明では、最終の線材の大きさが同じもの同士を比較する。
 表2に示すように試料No.1-1~No.1-17の銅合金線は、試料No.1-101~No.1-103に比較して、導電性に優れ、かつ高強度であることが分かる。定量的には、試料No.1-1~No.1-17はいずれも、導電率が40%IACS以上、引張強さが600MPa以上である。この理由の一つとして、試料No.1-1~No.1-17では、Fe,Ti,適宜Mgを上述の特定の範囲で含む特定の組成の銅合金から構成されていることが考えられる。この結果、Fe,Tiの含有に基づく析出強化による強度向上効果とTiなどの母相への固溶低減によるCuの導電率の維持効果とが得られた、適宜Mgの固溶強化による強度向上効果も得られた、と考えられる。別の理由の一つとして、試料No.1-1~No.1-17は、C,Mn,Siを適切に含むことで、Fe,Tiなどの酸化を防止でき、Fe,Tiの含有に基づく析出強化による強度向上効果と、母相への固溶低減によるCuの導電率の維持効果とが得られ易くなったためと考えられる。
In the following description, those having the same final wire size are compared.
As shown in Table 2, Sample No. 1-1-No. The copper alloy wire No. 1-17 is Sample No. 1-101-No. Compared with 1-103, it can be seen that it has excellent conductivity and high strength. Quantitatively, sample no. 1-1-No. 1-17 has an electric conductivity of 40% IACS or more and a tensile strength of 600 MPa or more. One reason for this is that sample no. 1-1-No. In No. 1-17, it is conceivable that the alloy is composed of a copper alloy having a specific composition containing Fe, Ti, and Mg as appropriate in the specific range. As a result, the strength improvement effect by precipitation strengthening based on the inclusion of Fe and Ti and the maintenance effect of Cu conductivity by reduction of solid solution in the parent phase such as Ti were obtained. Strength improvement by solid solution strengthening of Mg as appropriate It is thought that the effect was also obtained. As another reason, sample No. 1-1-No. 1-17 can appropriately prevent the oxidation of Fe, Ti, etc. by appropriately containing C, Mn, Si, and can improve the strength by precipitation strengthening based on the inclusion of Fe, Ti, and reduce the solid solution in the matrix. It is considered that the effect of maintaining the conductivity of Cu is easily obtained.
 導電率に着目すると、試料No.1-1~No.1-17はいずれも42%IACS以上であり、45%IACS以上の試料が多く、50%IACS以上、更に54%IACS以上の試料も多い。更には60%IACS以上である試料も多い。 Focusing on conductivity, sample no. 1-1-No. 1-17 is 42% IACS or more, many samples are 45% IACS or more, many samples are 50% IACS or more, and 54% IACS or more. In addition, there are many samples that are 60% IACS or higher.
 引張強さに着目すると、試料No.1-1~No.1-17はいずれも650MPa以上、更に680MPa超であり、690MPa以上、更に700MPa以上の試料も多い。更には、750MPa以上、800MPa以上、900MPa以上を満たす試料もある。 When paying attention to tensile strength, sample no. 1-1-No. 1-17 is 650 MPa or more, more than 680 MPa, and there are many samples of 690 MPa or more, and further 700 MPa or more. Furthermore, there are samples that satisfy 750 MPa or more, 800 MPa or more, and 900 MPa or more.
 組成に着目する。
 例えば、試料No.1-7,1-8と試料No.1-9,1-10とを比較すると、Fe及びTiの含有量が多い試料No.1-7,1-8の方が導電率及び引張強さの双方が高い。この理由の一つとして、Fe及びTiを含む析出物を良好に生成でき、析出強化による強度向上効果と、Cuへの固溶抑制によるCuの導電率の維持効果とが得られたため、と考えられる。
Focus on composition.
For example, sample No. 1-7, 1-8 and sample no. In comparison with Samples 1-9 and 1-10, Sample No. 1-7 and 1-8 have both higher conductivity and tensile strength. One reason for this is that precipitates containing Fe and Ti can be generated satisfactorily, and the effect of improving the strength by precipitation strengthening and the effect of maintaining the conductivity of Cu by suppressing solid solution in Cu are considered. It is done.
 Fe及びTiに加えて、Mgを含む試料No.1-9,1-10と、Mgを含まない試料No.1-11,1-12とを比較すると、Mgを含む試料No.1-9,1-10の方が強度により優れることが分かる。同様に、Mgを含む試料No.1-15,1-16と、Mgを含まない試料No.1-13,1-14とを比較すると、Mgを含む試料No.1-15,1-16の方が強度により優れることが分かる。また、Mgを含む試料No.1-7,1-8と、試料No.1-15,1-16とを比較すると、Mgの含有量が多いほど、高強度であることが分かる。この試験では、Mgを0.2質量%以上、更に0.3質量%以上含む試料No.1-15~1-17は、引張強さが950MPa以上であり、非常に高強度である。一方で、Mgを含まない場合には、導電率がより高くなり易いことが分かる。 Sample No. containing Mg in addition to Fe and Ti Sample Nos. 1-9 and 1-10 and Mg-free samples In comparison with 1-11, 1-12, sample No. 1 containing Mg It can be seen that 1-9 and 1-10 are superior in strength. Similarly, Sample No. containing Mg Sample Nos. 1-15 and 1-16 and Mg-free samples 1-13 and 1-14, sample No. 1 containing Mg It can be seen that 1-15 and 1-16 are superior in strength. Sample No. containing Mg 1-7, 1-8 and Sample No. A comparison between 1-15 and 1-16 shows that the higher the Mg content, the higher the strength. In this test, sample Nos. Containing 0.2% by mass or more and 0.3% by mass or more of Mg were used. Nos. 1-15 to 1-17 have a tensile strength of 950 MPa or more and are very high in strength. On the other hand, when Mg is not included, it turns out that electrical conductivity tends to become higher.
 試料No.1-104に着目すると、試料No.1-1~No.1-17と比較して導電率が低い。この理由の一つとして、試料No.1-104は、質量比でFe/Tiが10であることが考えられる。試料No.1-103に着目すると、試料No.1-1~No.1-17と比較して導電率が低い。この理由の一つとして、試料No.1-103は、Fe量が多過ぎること、質量比でFe/Tiが大き過ぎることが考えられる。一方、Fe量が少なく、かつFe/Tiが0.5以下と小さい試料No.1-101,1-102は強度に劣る。これらのことから、Fe量は0.05%超2%未満、Fe/Tiは0.5超10未満が好ましく、1.0以上5.5以下がより好ましいと考えられる。 Sample No. When focusing attention on 1-104, sample no. 1-1-No. Low conductivity compared to 1-17. One reason for this is that sample no. 1-104 may have an Fe / Ti ratio of 10 by mass. Sample No. Paying attention to 1-103, sample no. 1-1-No. Low conductivity compared to 1-17. One reason for this is that sample no. It is conceivable that 1-103 has too much Fe and Fe / Ti is too large by mass ratio. On the other hand, Sample No. with a small amount of Fe and Fe / Ti as small as 0.5 or less. 1-101 and 1-102 are inferior in strength. From these facts, it is considered that the Fe content is more than 0.05% and less than 2%, and Fe / Ti is preferably more than 0.5 and less than 10, and more preferably 1.0 or more and 5.5 or less.
 また、この試験からは、Cの含有量が60質量ppm以下、Mn及びSiの合計含有量が20質量ppm以下、これら3種の元素の合計含有量が100質量ppm以下、特に80質量ppm以下であれば、これらの元素の含有による導電率や強度の低下を招き難く、逆に、Fe,Tiを適切に機能させられると考えられる。 Further, from this test, the content of C is 60 mass ppm or less, the total content of Mn and Si is 20 mass ppm or less, the total content of these three elements is 100 mass ppm or less, particularly 80 mass ppm or less. If so, it is unlikely that the conductivity and strength are lowered due to the inclusion of these elements, and conversely, Fe and Ti are considered to function properly.
 熱処理に注目すると、この試験からは、所定の大きさのときに中間熱処理(軟化処理)を行った試料No.1-3,1-6,1-17は、中間熱処理を行わない場合(試料No.1-1,1-4,1-15)よりも導電率を高められる傾向にあるといえる。また、この試験では、Mgを含む場合でも伸線加工などの加工後に中間熱処理を行うと、導電率を向上できる場合があるといえる(例、試料No.1-3参照)。 When paying attention to heat treatment, from this test, it was confirmed that sample No. It can be said that 1-3, 1-6, and 1-17 tend to have higher electrical conductivity than when no intermediate heat treatment is performed (Sample Nos. 1-1, 1-4, and 1-15). In this test, even when Mg is contained, it can be said that the electrical conductivity may be improved by performing an intermediate heat treatment after the wire drawing or the like (see, for example, Sample No. 1-3).
 更に、試料No.1-1~No.1-17の線材は、応力緩和性にも優れる。ここでは、試料No.1-1,No.1-6の線材と、リン青銅の線材、黄銅の線材とについて以下のようにして応力緩和率を調べた。 Furthermore, sample no. 1-1-No. The wire 1-17 has excellent stress relaxation properties. Here, Sample No. 1-1, no. The stress relaxation rate of the 1-6 wire, the phosphor bronze wire, and the brass wire were examined as follows.
 応力緩和率は、日本伸銅協会技術標準「薄板条の曲げによる応力緩和試験方法」(JCBA、T309:2004)を参照して、片持ち梁式で測定する。試料に所定の曲げ応力を与えて弓なりに曲げた状態の試料を保持ブロックで支持した状態で加熱炉に入れて、以下の耐熱試験を行う。耐熱試験の条件は、所定の曲げ応力を0.2%耐力の50%、加熱温度を150℃、保持時間を10時間~1000時間から選択した時間とする。 The stress relaxation rate is measured by the cantilever method with reference to the Japan Copper and Brass Association technical standard “Stress relaxation test method by bending a thin strip” (JCBA, T309: 2004). The following heat resistance test is performed by placing the sample in a bowed state by applying a predetermined bending stress to the sample in a state where the sample is supported by a holding block. The conditions for the heat resistance test are a predetermined bending stress of 50% of 0.2% proof stress, a heating temperature of 150 ° C., and a holding time selected from 10 hours to 1000 hours.
 上記所定の曲げ応力を得るのに必要な試験片の初期たわみ変位δ(mm)と、以下の永久たわみ変位δ(mm)とから、応力緩和率(%)=(永久たわみ変位δ/初期たわみ変位δ)×100を求める。永久たわみ変位δtは、上述の耐熱試験後において、曲げ応力を除荷したときに生じる試験片のたわみ変位とする。 From the initial deflection displacement δ 0 (mm) of the test piece necessary for obtaining the predetermined bending stress and the following permanent deflection displacement δ t (mm), the stress relaxation rate (%) = (permanent deflection displacement δ t / Determine initial deflection displacement δ 0 ) × 100. The permanent deflection displacement δt is the deflection displacement of the test piece that occurs when the bending stress is unloaded after the above heat resistance test.
 リン青銅(C5191)の線材、黄銅(C2600)の線材はいずれも市販品(0.64mm×0.64mm)を用意した。 Commercially available products (0.64 mm × 0.64 mm) were prepared for both the phosphor bronze (C5191) wire and the brass (C2600) wire.
 各試料の線材の特性(導電率(%IACS)、引張強さ(MPa)、0.2%耐力(MPa))、保持時間ごとの応力緩和率(%)を表3に示す。各試料の線材の特性は、上述の金属材料引張試験方法やブリッジ法によって測定した。 Table 3 shows the properties of the wire of each sample (conductivity (% IACS), tensile strength (MPa), 0.2% proof stress (MPa)), and stress relaxation rate (%) for each holding time. The characteristics of the wire of each sample were measured by the above-described metal material tensile test method and bridge method.
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
 表3に示すように試料No.1-1,No.1-6の線材はいずれも、リン青銅の試料No.1-201及び黄銅の試料No.1-202に比較して、高い導電性と高強度とをバランスよく有する上に、応力緩和率が小さく、応力緩和し難いことが分かる。特に、試料No.1-1,No.1-6は、ばね性に優れるとされるリン青銅の試料No.1-201よりも応力緩和率が低く、1000時間経過後でも30%以下、更に25%以下である。特に、試料No.1-6では、1000時間経過後の応力緩和率が20%以下とより低い。このように応力緩和性に優れる理由の一つとして、試料No.1-1,No.1-6は、上述の特定の組成の銅合金から構成されることで、リン青銅よりも0.2%耐力が高いことが考えられる。また、この試験から、試料No.1-2~No.1-5,No.1-7~No.1-17の線材についても同様に応力緩和し難いと期待される。 Sample No. as shown in Table 3. 1-1, no. All of the wires 1-6 were phosphor bronze sample nos. 1-201 and brass sample no. Compared to 1-202, it has a good balance between high conductivity and high strength, and has a low stress relaxation rate, making it difficult to relieve stress. In particular, sample no. 1-1, no. Sample No. 1-6 for phosphor bronze, which is considered to be excellent in springiness. The stress relaxation rate is lower than 1-201, and it is 30% or less, and further 25% or less even after 1000 hours. In particular, sample no. In 1-6, the stress relaxation rate after 1000 hours is less than 20%. As one of the reasons why the stress relaxation property is excellent as described above, Sample No. 1-1, no. 1-6 is considered to have a 0.2% yield strength higher than that of phosphor bronze because it is composed of the copper alloy having the specific composition described above. In addition, from this test, sample No. 1-2 to No. 1-5, No. 1 1-7-No. Similarly, it is expected that the stress of 1-17 wire is difficult to relax.
 なお、応力緩和率を上述の片持ち梁式ではなく、以下の両端支持式の曲げ応力負荷治具を用いて測定した場合にも試料No.1-1~No.1-17の線材は応力緩和率が低く、応力緩和し難いと期待される。この治具は、試料(線材)の長さLよりも短い長さLの基板と、基板の両端からそれぞれ突設される支持脚とを備えるЦ状のものであり、両支持脚間を渡るように試料を配置することで、試料の両端を固定する。試料に所定の曲げ応力(例えば、耐力の80%)を与えて弓なりに曲げた状態の試料を支持脚間に配置して、試料の両端を治具に固定する。試料に上記所定の曲げ応力を加えた状態で治具ごと加熱炉に入れて、以下の耐熱試験を行う。耐熱試験の条件は、加熱温度を150℃、保持時間を10時間~1000時間から選択した時間とする。そして、上述のように初期たわみ変位と永久たわみ変位とから、応力緩和率を求める。
 例えば、上記所定の曲げ応力を耐力の80%とし、上記耐熱試験の加熱温度を150℃、保持時間を100時間とした場合、黄銅(C2600-H材)の応力緩和率は60%~55%程度である。この黄銅の応力緩和率は、伸銅品板条材料特性データベース(日本伸銅協会)に記載される値である。同様の加熱条件(150℃×100時間)で、試料No.1-1~No.1-17の線材の応力緩和率(両端支持)は、30%以下をとり得る、即ち、両端支持の場合でも黄銅よりも応力緩和性に優れると期待される。
In addition, when the stress relaxation rate was measured using the following both-end supported bending stress loading jig instead of the above-mentioned cantilever type, the sample No. 1-1-No. The wire 1-17 has a low stress relaxation rate and is expected to be difficult to relax. The jig includes a substrate with a short length L S than the length L 0 of the sample (wires) are those from both ends of the substrate Ц like and a support leg which protrude respectively, between the support legs Fix both ends of the sample by placing the sample so as to cross. A predetermined bending stress (for example, 80% of proof stress) is applied to the sample and the sample bent in a bow shape is placed between the support legs, and both ends of the sample are fixed to a jig. The sample is subjected to the following heat resistance test after placing the jig in a heating furnace with the predetermined bending stress applied. The conditions for the heat resistance test are a heating temperature of 150 ° C. and a holding time selected from 10 hours to 1000 hours. Then, as described above, the stress relaxation rate is obtained from the initial deflection displacement and the permanent deflection displacement.
For example, when the predetermined bending stress is 80% of the proof stress, the heating temperature of the heat test is 150 ° C., and the holding time is 100 hours, the stress relaxation rate of brass (C2600-H material) is 60% to 55%. Degree. This stress relaxation rate of brass is a value described in a copper strip product characteristic database (Japan Copper and Brass Association). Under the same heating conditions (150 ° C. × 100 hours), sample No. 1-1-No. The stress relaxation rate (supported at both ends) of the wire 1-17 can be 30% or less, that is, it is expected to be superior to brass even in the case of supporting both ends.
 この試験から、Fe及びTi、適宜Mgを特定の範囲で含む銅合金から構成される銅合金線は、高導電率かつ高強度であることが示された。また、この試験から、特定の組成とし、時効処理を少なくとも含む特定の熱処理を行うことで、高導電率かつ高強度な線材が得られることが示された。特に、この試験例のように連続鋳造工程で溶体化工程を兼ねたり、最終形状の成形を、異形ダイスを用いた伸線加工としたりすることで、工程数を低減したり、長尺な線材を連続して製造できたりすることで、製造性にも優れることが示された。 From this test, it was shown that a copper alloy wire composed of a copper alloy containing Fe, Ti, and Mg as appropriate in a specific range has high conductivity and high strength. Moreover, it was shown from this test that a highly conductive and high-strength wire can be obtained by performing a specific heat treatment including a specific composition and at least an aging treatment. In particular, as in this test example, the continuous casting process also serves as a solution heat treatment process, or the final shape is formed by wire drawing using a deformed die, thereby reducing the number of processes and long wire rods. It was shown that it is excellent also in manufacturability because it can be manufactured continuously.
 本発明はこれらの例示に限定されるものではなく、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。
 例えば、試験例1の銅合金の組成、角線の幅及び厚さ、熱処理条件などを適宜変更できる。
The present invention is not limited to these exemplifications, but is defined by the scope of the claims, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.
For example, the composition of the copper alloy of Test Example 1, the width and thickness of the square wire, the heat treatment conditions, and the like can be changed as appropriate.

Claims (8)

  1.  Feを0.1質量%以上1.5質量%以下、
     Tiを0.05質量%以上0.7質量%以下、
     Mgを0質量%以上0.5質量%以下含有し、
     残部がCu及び不純物から構成されるコネクタ端子用線材。
    Fe is 0.1 mass% or more and 1.5 mass% or less,
    Ti is 0.05 mass% or more and 0.7 mass% or less,
    Mg is contained in an amount of 0% by mass to 0.5% by mass,
    A wire for a connector terminal, the remainder being made of Cu and impurities.
  2.  導電率が40%IACS以上、引張強さが600MPa以上である請求項1に記載のコネクタ端子用線材。 The wire for connector terminals according to claim 1, wherein the electrical conductivity is 40% IACS or more and the tensile strength is 600MPa or more.
  3.  質量比で、Fe/Tiが1.0以上5.5以下である請求項1又は請求項2に記載のコネクタ端子用線材。 The wire material for connector terminals according to claim 1 or 2, wherein Fe / Ti is 1.0 or more and 5.5 or less by mass ratio.
  4.  更に、質量割合で、C,Si,及びMnから選択される1種以上の元素を合計で10ppm以上500ppm以下含む請求項1から請求項3のいずれか1項に記載のコネクタ端子用線材。 The wire material for connector terminals according to any one of claims 1 to 3, further comprising, in mass ratio, one or more elements selected from C, Si, and Mn in total from 10 ppm to 500 ppm.
  5.  150℃で1000時間保持した後の応力緩和率が30%以下である請求項1から請求項4のいずれか1項に記載のコネクタ端子用線材。 The connector terminal wire according to any one of claims 1 to 4, wherein a stress relaxation rate after being held at 150 ° C for 1000 hours is 30% or less.
  6.  横断面積が0.1mm以上2.0mm以下である請求項1から請求項5のいずれか1項に記載のコネクタ端子用線材。 The wire for connector terminals according to any one of claims 1 to 5, wherein a cross-sectional area is 0.1 mm 2 or more and 2.0 mm 2 or less.
  7.  横断面形状が四角形状の角線である請求項1から請求項6のいずれか1項に記載のコネクタ端子用線材。 The connector terminal wire according to any one of claims 1 to 6, wherein the cross-sectional shape is a square-shaped square wire.
  8.  表面の少なくとも一部に、Sn及びAgの少なくとも一方を含むめっき層を備える請求項1から請求項7のいずれか1項に記載のコネクタ端子用線材。 The wire material for connector terminals according to any one of claims 1 to 7, comprising a plating layer containing at least one of Sn and Ag on at least a part of the surface.
PCT/JP2017/005769 2016-02-22 2017-02-16 Wire material for connector terminal WO2017145913A1 (en)

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CN201780012766.3A CN108699630A (en) 2016-02-22 2017-02-16 Bonder terminal wire rod
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JPS6039139A (en) * 1983-08-12 1985-02-28 Mitsui Mining & Smelting Co Ltd Softening resistant copper alloy with high conductivity
JPS62133034A (en) * 1985-12-06 1987-06-16 Yazaki Corp Alloy for terminal
JP2010037629A (en) * 2008-08-07 2010-02-18 Mitsubishi Shindoh Co Ltd Conducting material for terminal and connector, and fitting-type connecting terminal
JP2014149956A (en) 2013-01-31 2014-08-21 Sumitomo Wiring Syst Ltd Press-fit terminal and method of manufacturing the same
JP2014156617A (en) * 2013-02-14 2014-08-28 Sumitomo Electric Ind Ltd Copper alloy wire, copper alloy twisted wire, coated electric wire, and coated electric wire having terminal
JP2015086452A (en) * 2013-11-01 2015-05-07 株式会社オートネットワーク技術研究所 Copper alloy wire, copper alloy twisted wire, coated cable, wire harness and manufacturing method of copper alloy wire
JP2016037652A (en) * 2014-08-08 2016-03-22 住友電気工業株式会社 Copper alloy wire, copper alloy twisted wire, covered electric wire and electric wire with terminal

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6039139A (en) * 1983-08-12 1985-02-28 Mitsui Mining & Smelting Co Ltd Softening resistant copper alloy with high conductivity
JPS62133034A (en) * 1985-12-06 1987-06-16 Yazaki Corp Alloy for terminal
JP2010037629A (en) * 2008-08-07 2010-02-18 Mitsubishi Shindoh Co Ltd Conducting material for terminal and connector, and fitting-type connecting terminal
JP2014149956A (en) 2013-01-31 2014-08-21 Sumitomo Wiring Syst Ltd Press-fit terminal and method of manufacturing the same
JP2014156617A (en) * 2013-02-14 2014-08-28 Sumitomo Electric Ind Ltd Copper alloy wire, copper alloy twisted wire, coated electric wire, and coated electric wire having terminal
JP2015086452A (en) * 2013-11-01 2015-05-07 株式会社オートネットワーク技術研究所 Copper alloy wire, copper alloy twisted wire, coated cable, wire harness and manufacturing method of copper alloy wire
JP2016037652A (en) * 2014-08-08 2016-03-22 住友電気工業株式会社 Copper alloy wire, copper alloy twisted wire, covered electric wire and electric wire with terminal

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