JP5147040B2 - Method for producing copper alloy conductor - Google Patents

Method for producing copper alloy conductor Download PDF

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JP5147040B2
JP5147040B2 JP2006171464A JP2006171464A JP5147040B2 JP 5147040 B2 JP5147040 B2 JP 5147040B2 JP 2006171464 A JP2006171464 A JP 2006171464A JP 2006171464 A JP2006171464 A JP 2006171464A JP 5147040 B2 JP5147040 B2 JP 5147040B2
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copper alloy
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temperature
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alloy conductor
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JP2008001933A (en
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洋光 黒田
浩義 蛭田
正義 青山
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日立電線株式会社
日立マグネットワイヤ株式会社
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The present invention relates to a method for producing a copper alloy conductor using a high conductivity, high strength copper alloy material, which is used for a trolley wire for a train line that supplies power to a train via a pantograph or the like, or a cable conductor for equipment. Is.

For the trolley wire for train lines or the cable conductor for equipment, a hard copper wire having high conductivity or a copper alloy material (copper alloy wire) having wear resistance and heat resistance is used. As a copper alloy material, a copper base material containing 0.25 to 0.35 mass % of Sn is known (see Patent Document 1), and a trolley wire of a Shinkansen or a conventional line or a cable conductor for equipment. It is used as

  In recent years, the speed of trains has been increased, and in order to cope with this, it is required to increase the overhead wire tension of the trolley wire, and the overhead wire tension of the train wire is changed from 1.5 t to 2.0 t or more. There is a tendency. Therefore, a high-strength copper alloy conductor that can withstand these high tensions has been demanded. High-strength copper alloy conductors are mainly classified into two types: (1) solid solution strengthened alloys and (2) precipitation strengthened alloys.

Examples of the solid solution strengthening type alloy (1) include a Cu—Ag alloy (high concentration silver), a Cu—Sn alloy, a Cu—Sn—In alloy, a Cu—Mg alloy, and a Cu—Sn—Mg alloy.
All of the solid solution strengthened alloys have an oxygen content of 10 ppm by mass (0.001% by mass ) or less and are excellent in elongation characteristics as well as strength. It can be directly produced from a molten copper alloy by continuous casting and rolling.

As a conventional method for producing a trolley wire using a solid solution strengthened alloy, for example, a copper alloy casting material containing 0.4 to 0.7 mass % of Sn is hot-rolled at a temperature of 700 ° C. or higher. And rolled material. There is a method in which this rolled material is heated again at a temperature of 500 ° C. or less, finish-rolled to form a rough drawn wire, and this rough drawn wire is drawn to produce a trolley wire (see Patent Document 2).

Moreover, there exists a Cu-O-Sn alloy as another copper alloy which can be continuously cast-rolled. This alloy is present inside as a crystallized substance (SnO 2 ) with Sn of 2 to 3 μm or more, and the strength and elongation characteristics are equivalent to those of a Cu—Sn alloy having an oxygen content of 10 mass ppm or less. It is known. This alloy is also an alloy having stronger solid solution strengthening action than precipitation strengthening action and dispersion strengthening action.

By the way, these solid solution strengthened alloys can be improved in strength as the content of the solid solution strengthening element is increased. However, since the conductivity is extremely lowered with this, the current capacity is increased. I can't do it and it's not suitable as a train line. For example, the manufacturing method described in Patent Document 2 has a high Sn content of 0.4 to 0.7% by mass , resulting in low electrical conductivity. Therefore, it is difficult to produce a copper alloy conductor having the necessary strength as a high-strength overhead wire and good conductivity with the current Cu—Sn alloy. Here, in order to obtain a high-strength and high-conductivity train line, it is conceivable to add another element together with Sn. In this case, if finish rolling (final rolling) is performed at a temperature of 500 ° C. or less, cracks of the rolled material increase at the time of rolling, so that the appearance quality of the rough drawn wire is extremely deteriorated, and thus the strength of the train line. There has been a problem that is extremely lowered.

  On the other hand, examples of the precipitation strengthening type alloy (2) include a Cu—Zr alloy, a Cu—Cr alloy, and a Cu—Cr—Zr alloy. However, although these precipitation strengthened alloys have very high hardness and tensile strength, an excessive load is applied to the rolling roll in continuous casting and rolling due to the high hardness, and it is impossible to manufacture by continuous casting and rolling. For this reason, it can manufacture only by the batch type by methods, such as extrusion. In addition, the precipitation-strengthened alloy requires heat treatment for precipitating the precipitation strengthened material in an intermediate step. Therefore, the precipitation-strengthened alloy has a problem that the productivity is low and the manufacturing cost is high as compared with a solid solution strengthened alloy that can be manufactured by continuous casting and rolling.

Furthermore, in order to solve these problems, it is known that another element is added to the Sn-added alloy and the manufacturing method is devised to achieve both high strength and high conductivity (Patent Document) 3).
Japanese Patent Publication No.59-43332 JP-A-6-240426 JP 2005-126790 A

  Recent train tracks have been further increased in speed, and in order to cope with this, it is required to increase the tension of the trolley wire. In addition, the demand for higher current capacity of the trolley line is even stronger on lines with high train passage density.

  Also, cable conductors for equipment are required to have high bending resistance, that is, high-strength conductors from the viewpoint of the use environment, and further, it is necessary to increase the conductivity of the conductors in order to reduce weight and size. Has been.

  However, even in the copper alloy conductor described in Patent Document 3, it is difficult to say that the characteristics required for such a recent trolley wire for train lines or cable conductors for equipment are sufficiently satisfied, and further. There is a demand for producing a copper alloy conductor that achieves both high strength and high electrical conductivity by using a continuous casting and rolling method with excellent productivity.

Accordingly, an object of the present invention is to provide a method for producing a copper alloy conductor using a copper alloy material having both high strength and high conductivity required for a recent trolley wire for train lines or cable conductors for equipment. There is.

In order to achieve the above object, the method for producing a copper alloy conductor according to the present invention includes a copper base material containing 0.001 to 0.1 mass % (10 to 1000 ppm by mass ) of oxygen with Sn as the first additive element. .4 (excluding 0.4) 0.7 wt%, and 0.01 to 0.4 wt% in as second additive element, and said first additive element of the second additional element A total of 0.41 (excluding 0.41) to 0.8% by mass is added and dissolved, and a melting step for forming a copper alloy melt comprising the copper and inevitable impurities as the balance, and the copper alloy A casting process using the molten metal at a temperature of 1100 to 1150 ° C., and rapidly cooling the cast material to a temperature at least 15 ° C. lower than the melting point of the copper alloy molten metal to obtain a cast material; In a state where the temperature is adjusted to 900 ° C. or lower, What hot rolling line of a plurality of stages of extension temperature was adjusted to 500 to 600 ° C., the rolled material and hot rolling step of forming a rolled material, at a temperature of -193~100 ° C., processed A cold rolling step of forming a copper alloy conductor by performing cold working at a degree of 50% or more is provided.

  Furthermore, the copper alloy conductor can be used as a trolley wire for a train line, or a cable can be provided by providing an insulating layer around a single wire or a stranded wire made of the copper alloy conductor.

According to the present invention, a copper alloy conductor using a copper alloy material having both high strength and high conductivity required for a trolley wire for a train line or a cable conductor for equipment in recent years can be manufactured with good productivity. A simple manufacturing method can be provided.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings.

  In FIG. 1, the flowchart explaining the manufacturing process of the copper alloy conductor which concerns on suitable one Embodiment of this invention is shown.

  As shown in FIG. 1, the manufacturing method of the copper alloy conductor 18 which concerns on this Embodiment adds and melt | dissolves Sn12 and the additional element 13 in the copper base material 11, and melt | dissolves (F1) which forms the copper alloy molten metal 14 ), A casting step (F2) for casting the molten copper alloy 14 to form a cast material 15, and heat for forming a rolled material 16 by subjecting the cast material 15 to multiple stages (multi-stage) hot rolling. The intermediate rolling step (F3), the rolling material 16 is washed, wound and wound into a rough drawn wire 17 (F4), and the wound rough drawn wire 17 is sent out, and the rough drawn wire 17 is cooled. And a cold rolling step (F5) for forming the copper alloy conductor 18 by performing a hot work. Hereinafter, each step will be described in detail.

(Dissolution process: F1)
First, the copper base material 11 containing 0.001 to 0.1% by mass (10 to 1000 ppm by mass ) of oxygen is added to Sn12 in the range of 0.4 (not including 0.4) to 0.7% by mass , preferably 0. .5~0.6 mass%, 0.01 to 0.4 mass% of in as an additive element 13, preferably 0.01 to 0.2 wt%, and the sum of Sn12 and additive elements 13 0.41 (0 The molten copper alloy 14 is formed by adding and melting at a ratio of 0.8 to 0.8% by mass , preferably 0.51 to 0.7% by mass . Since the additive element 13 is an element having an affinity for oxygen larger than that of Sn12, the oxide that is preferentially oxidized over Sn and formed and dispersed in the crystal structure of the finally obtained copper alloy conductor 18 is Most of them (80% or more) become oxides of additive elements, and Sn oxides are hardly generated or dispersed. Therefore, most of the added Sn 12 is alloyed with copper to form a matrix of the copper alloy conductor 18.

When the total content of Sn12 and additive element 13 is less than 0.41% by mass, the effect of improving the strength of the copper alloy conductor 18 is not recognized even when the manufacturing method according to the present embodiment is applied. Further, if the total content exceeds 0.8% by mass, the hardness of the cast material 15 is increased, and the deformation resistance during the rolling process is increased, so that the load on the rolling roll is extremely increased, and the product is commercialized. It becomes difficult.

Accordingly, in the present embodiment, by appropriately adjusting the total content of Sn12 and additive element 13 in the range of 0.41 to 0.8 mass %, as described later in [Example], a copper alloy conductor It is possible to improve the tensile strength of 18 to 450 MPa or higher and to adjust the conductivity to 60% IACS or higher.

When the total content of Sn12 and additive element 13 increases, the surface scratches of the rolled material 16 tend to increase during hot rolling in the hot rolling step (F3). Therefore, when the total content of Sn12 and additive element 13 is large (for example, 0.6% by mass or more), Sn 12 and additive element 13 are added to copper base material 11 in order to reduce surface scratches on rolled material 16. In addition, P may be further added. P is preferably contained in a proportion of 2 ppm to 0.01 mass % (100 mass ppm). If the P content is less than 2 ppm, the effect of reducing the surface scratches on the copper wire is not recognized so much. If the P content exceeds 100 ppm by mass , the conductivity of the copper alloy conductor 18 is lowered.

Moreover, when the total content of Sn12 and the additive element 13 increases, the crystal grains of the cast material 15 after the casting step (F2) tend to become slightly larger (and thus the strength of the copper alloy conductor 18 tends to decrease slightly). is there. Therefore, when the total content of Sn12 and additive element 13 is large (for example, 0.5% by mass or more), Sn12 and additive element are added to the copper base material 11 in order to make the crystal grains of the cast material 15 fine. In addition to 13, B may be added. B is preferably contained in a proportion of 2 ppm to 0.01 mass % (100 mass ppm). If the content of B is less than 2 ppm, the effect of making the crystal grains fine (and hence the effect of improving the strength of the copper alloy conductor 18) is not so much observed. If the content of B exceeds 100 mass ppm, the copper alloy The electrical conductivity of the conductor 18 will fall.

Furthermore, you may contain both P and B in the ratio of a total of 0.02 mass % (200 mass ppm) or less.

(Casting process: F2)
Next, the molten copper alloy 14 obtained in the previous step is subjected to SCR continuous casting and rolling. Specifically, casting is performed at a temperature (1100 to 1150 ° C.) lower than the normal casting temperature (1120 to 1200 ° C.) of SCR continuous casting, and the mold (copper mold) is forcibly water-cooled, The cast material 15 is rapidly cooled to a temperature that is at least 15 ° C. lower than the solidification temperature.

  The size of the oxide crystallized (or precipitated) in the cast material 15 by the casting process and the quenching process, and the crystal grain size of the cast material 15 are determined when the casting material 15 is cast at a normal casting temperature or [ Compared with the case where it cools only to the temperature exceeding the solidification temperature of the copper alloy molten metal -15 ° C.], each becomes smaller.

(Hot rolling process: F3)
Next, in a state where the temperature of the casting material 15 is 50 to 100 ° C. lower than the normal hot rolling temperature in continuous casting rolling, that is, the temperature of the casting material 15 is adjusted to 900 ° C. or less, preferably 750 ° C. to 900 ° C. The hot rolling is performed in multiple stages. At the time of final rolling, hot rolling is performed at a rolling temperature of 500 to 600 ° C., and the rolled material 16 is formed. If the final rolling temperature is less than 500 ° C., many surface scratches occur during the rolling process, resulting in deterioration of the surface quality, and if it exceeds 600 ° C., the crystal structure becomes a coarse structure of the same level as before. End up.

  By this hot rolling, a relatively small size oxide crystallized (or precipitated) in the previous step is divided, and the size of the oxide is further reduced. In addition, since the hot rolling in the manufacturing method according to the present embodiment is performed at a lower temperature than normal hot rolling, the dislocations introduced during rolling are rearranged, and small subgrains are formed in the crystal grains. A field is formed. The subgrain boundary is a boundary between a plurality of crystals having slightly different orientations existing in the crystal grains.

(Washing and winding process: F4)
Next, the rolled material 16 is washed and wound to be a rough drawn wire 17. The wire diameter of the wound rough drawing wire 17 is, for example, 8 to 40 mm, preferably 30 mm or less. For example, the wire diameter of the rough drawn wire 17 in the trolley wire is 20 to 30 mm.

(Cold rolling process: F5)
Finally, the drawn rough wire 17 is sent out, and cold working (drawing) is performed on the rough wire 17 at a temperature of −193 ° C. (liquid nitrogen temperature) to 100 ° C., preferably −193 to 25 ° C. or less. Do. Thereby, the copper alloy conductor 18 is formed. Here, in order to reduce the influence (strength reduction, etc.) on the copper alloy conductor 18 due to the processing heat at the time of continuous wire drawing, a cold working apparatus such as a drawing die is cooled, and the wire temperature is preferably 100 ° C. or less. Is adjusted to 25 ° C. or lower. Moreover, in order to improve the strength of the copper alloy conductor 18, it is necessary to increase the workability in the hot rolling process and sufficiently improve the strength of the rolled material 16, that is, the rough drawn wire 17, It is necessary to set the degree of processing in cold working to 50% or more. Here, if the degree of work is less than 50%, a tensile strength exceeding 450 MPa cannot be obtained.

Thereafter, the copper alloy conductor 18 is processed into a wire, strip (plate), or the like having a desired shape according to the application. For example, a trolley wire for a train line has a cross-sectional area of 110 to 170 mm 2 .

  As described above, in each of the steps described above, existing or conventional continuous casting and rolling equipment (SCR continuous casting machine) can be applied from the melting step (F1) to the cleaning / winding step (F4). In addition, an existing or conventional cold working apparatus can be applied to the cold working step (F5).

(Operation of this embodiment)
Conventional copper alloy conductors have a coarse crystal structure. Further, the oxide such as Sn is a coarse oxide having an average particle size (or length) exceeding 1 μm, and as a result, the conventional copper alloy conductor has not been sufficiently high in tensile strength.

On the other hand, in the manufacturing method of the copper alloy conductor 18 according to the present embodiment, the copper base material 11 is made of Sn12 from 0.4 (not including 0.4) to 0.7 mass % and In. Additive element 13 is added in an amount of 0.01 to 0.4 mass %, and Sn12 and additive element 13 are added in a ratio of 0.41 (excluding 0.41) to 0.8 mass % to form molten copper alloy 14. Then, using the molten copper alloy 14, continuous casting at a low temperature (casting temperature is 1100 to 1150 ° C.), low-temperature rolling (final rolling temperature is 500 to 600 ° C.), and 100 ° C. or less so that processing heat does not act. The cold-working which adjusted the temperature is performed and the copper alloy conductor 18 is manufactured.

  As a result, the copper alloy conductor 18 according to the present embodiment has a finer crystal structure than the conventional copper alloy conductor, that is, the average grain size of the crystal grains of the copper alloy conductor 18 is reduced to 100 μm or less. In the matrix of the copper alloy conductor 18, 80% or more of the oxide of the additive element 13 is dispersed as fine oxide having an average particle diameter of 1 μm or less at the crystal grain boundaries of each crystal grain. Furthermore, minute subgrain boundaries (subboundaries) are formed in the crystal grains. Due to the sub-grain boundaries and the minute oxides dispersed in the crystal grain boundaries, the crystals and grain boundaries that have slightly different orientations in the crystal grains move due to the heat (sensible heat) of the cast material 15. It is suppressed. As a result, since the growth of each crystal and each crystal grain during hot rolling is suppressed, the crystal structure of the rolled material 16 becomes fine.

(Effect of this embodiment)
As described above, the strengthening of the copper alloy conductor 18 according to the present embodiment is due to the improvement in strength of the copper alloy conductor matrix by refining crystal grains and the dispersion strengthening by dispersing fine oxides in the matrix. Compared with the strengthening only by solid solution strengthening of Sn described in Patent Document 2 and the like, the rate of decrease in conductivity can be suppressed to a low level. Therefore, according to the manufacturing method according to the present embodiment, the copper alloy conductor 18 having a high tensile strength can be obtained without causing a significant decrease in conductivity. That is, as described in [Example] described later, the copper alloy conductor 18 having a high conductivity of 60% IACS or more and a high strength (tensile strength) of 450 MPa or more required for a high-tensile overhead wire. Can be obtained.

  In addition, since the manufacturing method according to the present embodiment can use existing or conventional continuous casting and rolling equipment and cold working equipment, it does not require new equipment investment, and has high conductivity and high strength copper. The alloy conductor 18 can be manufactured at low cost.

  Further, by using the copper alloy conductor 18 obtained by the manufacturing method according to the present embodiment, a single wire material or a stranded wire material is formed, and an insulating layer is provided around the single wire material or the stranded wire material. High-strength cables (wiring materials, power supply materials) can also be obtained.

  As described above, the present invention is not limited to the above-described embodiment, and it goes without saying that various other things are assumed.

  Next, although this invention is demonstrated based on an Example, this invention is not limited to these Examples.

  A copper alloy conductor (copper alloy wire for train wire) having a diameter of 23 mm was prepared by changing the kind and amount of the additive element added to the copper base material, the final rolling temperature of the hot rolling process, and the like. The copper alloy conductor was manufactured using the method for manufacturing a copper alloy conductor according to the present invention.

(Examples 1-3)
Oxygen to each copper base material containing 10 mass ppm, 0.5 wt% of Sn, a copper alloy material which contains In at a rate of respectively 0.1, 0.2, 0.3 mass%, a copper alloy A conductor was produced. The final rolling temperature was 560 ° C. for all.

(Examples 4 to 6)
A copper alloy conductor was produced in the same manner as in Examples 1 to 3, except that each copper base material containing 350 mass ppm of oxygen was used.

(Examples 7 to 9)
A copper alloy conductor was produced in the same manner as in Examples 1 to 3, except that each copper base material containing 500 mass ppm of oxygen was used.

(Examples 10 and 11)
Oxygen 350 mass ppm 0.5 wt% of Sn on each of copper base material containing, a copper alloy material which contains In at a rate of respectively 0.3 wt%, to prepare a copper alloy conductor. The final rolling temperature was 560 ° C. for all. Moreover, about Example 10, P was further included in the ratio of 0.0050 mass %, and about Example 11, B was further included in the ratio of 0.0050 mass %.

(Comparative Examples 1-3)
Copper alloy conductors were produced in the same manner as in Examples 4 to 6 except that each copper base material containing 350 mass ppm of oxygen contained Sn in a proportion of 0.2 mass %.

(Comparative Examples 4-6)
Copper alloy conductors were produced in the same manner as in Examples 4 to 6 except that the final rolling temperature was 650 ° C.
(Comparative Examples 7-9)
Copper alloy conductors were produced in the same manner as in Examples 4 to 6 except that the final rolling temperature was 450 ° C.

  Table 1 shows the production conditions (oxygen content, type and content of additive element, final rolling temperature) of the copper alloy conductors of Examples 1 to 11 and Comparative Examples 1 to 6.

Next, using the copper alloy conductors of Examples 1 to 11 and Comparative Examples 1 to 6, trolley wires having a cross-sectional area of 130 mm 2 were prepared. Table 2 shows the tensile strength (MPa), electrical conductivity (% IACS), oxide ratio, crystal grain size, surface quality, and hot rollability of each trolley wire.

  Regarding the ratio of oxides, the ratio of oxides having an average particle diameter of 1 μm or less is 80% or more, and the case of less than 80% is ×.

  As for the crystal grain size, when the average grain size of the crystal grains in the trolley wire using the copper alloy conductor of Comparative Example 4 is 1, the crystal grain size is less than 0.5, and 0.5-1 Was marked with x.

  As for the surface quality, the surface scratches after hot rolling were evaluated as ◯ when the surface scratches were small, Δ when the surface scratches were slightly, and × when the surface scratches were large.

  Regarding the hot rollability, the case where the hot rollability was good was evaluated as ◯, and the case where the hot rollability was poor as x.

  As shown in Table 2, each trolley wire produced using each copper alloy conductor of Examples 1 to 11 had a tensile strength of 450 MPa or more and a conductivity of 60% IACS or more. In each trolley wire, the ratio of the oxide having an average particle diameter of 1 μm or less was 80% or more, and the crystal grain size was less than 0.5. Furthermore, each trolley wire had good surface quality and good hot rollability.

On the other hand, although each trolley wire produced using the copper alloy conductors of Comparative Examples 1 to 3 had a good ratio of fine oxides and a crystal grain size, the strength was small because the Sn addition amount was small. . Each trolley wire produced using the copper alloy conductors of Comparative Examples 4 to 6 had a small proportion of fine oxides and only large crystal grains. Moreover, although electroconductivity was favorable, tensile strength was a value smaller than an Example.
Further, each of the copper alloy conductors of Comparative Examples 7 to 9 had many surface flaws and remarkably poor hot rollability, making it difficult to produce the conductor.

It is a flowchart explaining the manufacturing process of the copper alloy conductor which concerns on suitable one Embodiment of this invention.

11 Copper base material 12 Sn
13 Additive element 14 Copper alloy molten metal 15 Cast material 16 Rolled material 17 Rough drawing wire 18 Copper alloy conductor

Claims (2)

  1. In a copper base material containing 0.001 to 0.1% by mass of oxygen, Sn as a first additive element is 0.4 (excluding 0.4) to 0.7% by mass , and In is used as a second additive element. 0.01 to 0.4% by mass , and the total of the first additive element and the second additive element is added and dissolved in a ratio of 0.41 (excluding 0.41) to 0.8% by mass And performing a casting process at a temperature of 1100 to 1150 ° C. using the molten copper alloy, and the temperature of the cast material of the molten copper alloy. In a state where the casting material is rapidly cooled to a temperature that is at least 15 ° C. lower than the melting point, and the temperature of the casting material is adjusted to 900 ° C. or less, the final rolling temperature of the casting material is 500 to 600 ° C. form a rolled material by performing becomes so hot rolling of the adjusted multiple stages A hot rolling step of, in the rolled material at a temperature of -193~100 ° C., characterized in that it comprises a cold rolling step of forming a copper alloy conductor performs machining between working ratio of 50% or more of cold A method for producing a copper alloy conductor.
  2. The method for producing a copper alloy conductor according to claim 1 , wherein at least one of P and B is added as a third additive element at a ratio of 0.01% by mass or less to form a molten copper alloy.
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