JPH01175535A - Copper coated composite trolley line - Google Patents

Abstract

PURPOSE:To improve strength and corrosion resistance by coating the periphery of a copper alloy core material containing 0.05-1wt.% Pb and one kind or two or more kinds out of Cr, Zr, Al, Ni, Fe, Zn, Co, Ag, Si, Ti and Sn at a defined concentration, with copper at a coating ratio of 20-65%. CONSTITUTION:One kind or two or more kinds of elements selected from among Cr, Zr, Al, Ni, Fe, Zn, Co, Ag, Si, Ti and Sn are contained in the copper alloy of a core material 3 at the concentration of 3-15wt.% in the total amount of obtain hypertension, a high abrasion resistance, and a high corrosion resistance. Also, approx. 0.05-1wt.% Pb is contained to facilitate a surface washing treatment by cutting enabling the stable coating of copper. Further, the core material 3 is coated with copper 4 at a sectional area ratio of 20-65% to obtain a trolley line with an electric conductivity of 50% IACS or more. Thereby, stringing tensile force can be increased enabling an electric car to be operated at a higher speed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a copper-coated composite trolley wire in which a core material made of a copper alloy is coated with copper, and a high-tensile copper-coated composite trolley wire with excellent wear resistance. Regarding lines.

[Prior Art] A copper wire or a copper alloy wire is usually used as a railway contact wire. Incidentally, recently there has been a strong demand for high-speed train operation, and for this reason, there is a demand for further increasing the strength of contact wires.

In other words, in order to increase the operating speed of trains, it is necessary to increase the wave propagation speed of the contact wire.

In this case, the wave propagation speed C is expressed by the following formula.

C=FT77 However, T is the overhead wire tension, and ρ is the linear density (weight per unit length) of the contact wire.

As is clear from this equation, in order to increase the wave propagation speed C, it is necessary to increase the tension T or decrease the linear density ρ. Therefore, as a technique to reduce the linear density ρ and increase the propagation speed C, an aluminum composite contact wire in which a steel wire is coated with aluminium and crimped is proposed.

In addition, by increasing the strength of the contact wire, the overhead wire tension T
As a technology to increase the propagation speed C by setting C higher than usual, a composite contact wire made of iron-based material and copper-based material, which is stronger than copper, has been proposed (Japanese Patent Application Laid-Open No. 12278-1982).
See issue 6>.

Furthermore, a composite contact wire has been proposed in which a copper alloy is used as a core material and pure copper is coated around the core (Japanese Patent Laid-Open No. 60-4255).
issue).

[Problems to be Solved by the Invention] However, these conventional contact wires have the following drawbacks.

First, in aluminum composite contact wires, since the contact wire attachment fittings are made of a prepared alloy, there is a problem in that the copper alloy of the attachment fittings comes into contact with the aluminum coating layer of the contact wire, resulting in contact corrosion.

In order to avoid this corrosion, it is necessary to change all the currently popular mounting brackets to materials that do not cause contact corrosion with aluminum, which is not practical in terms of cost.

In addition, in composite contact wires made of iron-based materials and copper-based materials, corrosion occurs between the iron-based materials and the copper-based materials, which causes many practical problems. Techniques have also been proposed to prevent corrosion by interposing a layer of lead or tin between the contact wire, but the presence of such an intermediate layer poses problems in terms of the strength of the contact wire. This is not preferable because it complicates the manufacturing process.

Furthermore, the copper-coated composite contact wire with a copper alloy as a core material has a low strength due to the low strength of the copper alloy disclosed in the above-mentioned publication.
It is not possible to build overhead lines with high enough tension to allow high-speed train operation.

Furthermore, none of the conventional contact wires have satisfactory wear resistance, and for routes with high frequency of operation, there is a demand for the development of contact wires with excellent wear resistance that can extend their service life. .

The present invention has been made in view of such problems, and includes:
An object of the present invention is to provide a high-strength copper-coated composite trolley cage that has excellent corrosion resistance and abrasion resistance and is capable of increasing overhead wire tension.

[Means for Solving the Problems] A copper-clad composite contact wire according to the present invention has a copper alloy as a core material and the core material is coated with copper. The alloy contains 0°05 to 1% by weight of P.
b and also contains Cr.

Zr, AJ, Ni, Fe, Zn, Co, Ag.

The coating material contains 1s or two or more elements selected from Si, Ti, and Sn in a total concentration of 3 to 15% by weight, and the coating material has a coverage of 20 to 65% in terms of cross-sectional area ratio. shall be.

[Function] In the present invention, since a high-strength copper alloy with a predetermined composition is used as the core material, the strength of the contact wire is high and it is possible to increase the tension of the overhead wire. , it will be possible to increase the operating speed of trains. Also, since high-strength copper alloy is used, the contact wire has high wear resistance.

Furthermore, since the core material is covered with a copper covering material, contact corrosion with the copper alloy mounting fittings is prevented, and the required electrical conductivity as a contact wire is ensured.

Furthermore, in the present invention, since both the core material and the coating material are copper-based materials, the progress of contact corrosion is prevented.

[Example code] Examples of the present invention will be specifically described below.

First, the material composition of the core material of the copper-coated composite contact wire according to the present invention will be explained.

The core material of this contact wire contains 0.05 to 1% by weight of Pb (hereinafter simply expressed as %), and also contains Cr and Zr.
, AA, Nt, Fe, Zn, Co.

One or more elements selected from Ag, Si, Ti, and Sn are contained in a total concentration of 3 to 15%.

Pb is added to the core copper alloy to facilitate cutting. As described later, for example, in the process of coating copper around the core material using the dip forming method, in order to clean the surface of the copper alloy core material, the surface layer of the core material is cut with a peeling die. . In order to facilitate this cutting process, Pb is added to the core copper alloy. If the Pb content is less than 0.05%, the effect of improving machinability is small, while even if it is added in excess of 1%, it is not possible to expect a further improvement in machinability and it is wasteful. . Therefore, the content of Pb is set to 0.05 to 1%.

Cr, AJ, Ni, Fe, Zn, Zr, Co, Ag, S
i, Ti, and Sn are all added to copper alloys to improve their strength and heat resistance. For this reason, one or more of these elements are selected and added to the copper alloy, and the total amount added is 3 to 15%. If the content of this additive component is less than 3%, the effect of increasing the strength of the copper alloy will be small, while if it exceeds 15%, workability will decrease. For this reason, the content of the additional components is set at 3 to 15%.

In the present invention, a copper alloy having such a composition is used as a core material, and a cross-sectional area ratio of 20 to 6 is formed around this core material.
Coated with copper at a coverage rate of 5%.

Copper alloys containing approximately 5 to 15% alloying components have significantly reduced conductivity and cannot be used as contact wires. Therefore, the copper alloy core material is coated with high-conductivity copper. to ensure conductivity.

In this case, if the coverage rate of this copper coating material is less than 20%, the conductivity of the composite contact wire will be lower than 50% IAC9 (value when the conductivity of pure copper annealed material is taken as 100), and the On the other hand, if the coverage rate of the coating material exceeds 65%, the proportion of the copper alloy core material will be relatively small, and the strength and durability, which are the objectives of the present invention, will be reduced. A sufficient effect of improving wear resistance cannot be obtained. For this reason, the coverage ratio of the copper coating material is set to 20 to 65% in cross-sectional area ratio.

Next, a method for manufacturing this copper-coated composite contact wire will be explained.

FIG. 1 explains a so-called dip forming apparatus used for manufacturing a copper-coated composite contact wire according to an embodiment of the present invention. In this dip forming device, a copper coating device 20 is disposed above a copper alloy wire supply device 10.

The airtight housing 11 of the supply device 10 is provided with an exhaust port 15 connected to a suitable evacuation device, and the inside of the housing 11 is evacuated to a predetermined degree of vacuum through the exhaust port 15. . A stripping die 12 is installed at the copper alloy wire inlet on the side of the housing 11, and the surface layer of the copper alloy wire 1 fed into the housing 11 from this inlet is cut by the stripping die 12.

At this time, if the copper alloy has a high alloy content of 5 to 15% and its strength is high, cutting with the peeling die 12 becomes difficult or the life of the peeling die 12 becomes extremely short. However, in the present invention, since 0.05 to 1% of Pb is contained in the copper alloy with a high addition amount, good machinability can be obtained.

A capstan 13 is installed in the housing 11, and the copper alloy wire 1 is wound around the capstan 13 to change its traveling direction upward. Two pairs of pinch rolls 16 are disposed at the upper part of the housing 11, and the copper alloy wire 1 is pulled out and driven by the pinch rolls 16 and supplied from the housing 11 to the coating device 20.

The coating device 20 includes a crucible 22 in which molten copper 21 is stored.
has. This crucible 22 is made of a refractory material such as graphite, and is connected to the housing 11 with its outer bottom surface airtightly closing the upper end outlet of the housing 11 of the supply device 10. An insertion hole 23 having substantially the same diameter as the steel wire 1 is formed at the bottom of the crucible 22, and the steel wire 1 is introduced into the crucible 22 through the insertion hole 23 in a liquid-tight manner. .

A molten metal supply port 24 connected to a copper melting device 30 is provided on the side of the crucible 22, and the molten metal 21 is supplied into the crucible 22 through this supply port 24.

Above the coating device 20, a wire drawing device (not shown) is provided.
is installed, and the composite i&12, in which the copper alloy wire 1 is coated with copper, is pulled upward by this drawing device. The composite wire 2 is fed from the coating device 20 to a subsequent hot rolling device (not shown).

The copper coverage rate can be adjusted by changing the immersion time of the copper alloy wire 1 into the molten copper 21.

In the present invention, after coating a copper alloy wire with copper using the dip forming apparatus configured as described above, the composite wire is hot rolled. As a result, the copper alloy of the core material and the copper of the covering material are firmly connected at their joints and become integral.

Next, this hot-worked composite wire is drawn and grooved to finish it as a copper-coated copper alloy contact wire.

FIG. 2 shows a cross-sectional view of the copper-coated composite contact wire manufactured in this manner. Copper covering material 4 covering copper alloy wire core material 3
A pair of V-shaped grooves 5 are formed therein. A contact wire is installed by gripping it with a copper fitting through this groove 5.

Since the copper-coated composite contact wire constructed in this way is covered with a copper covering material 4 at a predetermined coverage rate, this covering material 4 comes into contact with the mounting bracket for suspending the contact wire. Therefore, contact corrosion will not occur with the copper alloy mounting fittings. Furthermore, since a high-strength copper alloy wire is used as the core material 3, the contact wire has high strength and excellent wear resistance.

Since the contact wire has such high strength, the overhead wire tension T can be set high. Therefore, as described above, the wave propagation speed C can be increased, making it possible to increase the speed of the train.

Since the composite contact wire according to the embodiment of the present invention is a combination of a copper sheathing material and a copper alloy core material, even if the contact wire is worn out and the core material 3 is exposed, the same copper-based material can be used. Since the combination is strong and the joints are firmly joined, the joint interface will not be preferentially corroded.

In addition, since the high-strength copper alloy of the core material contains 0.05 to 1% Pb), the core material can be easily stripped in the deep forming process, and the composite wire can be stably processed. It is possible to manufacture

Next, the results of manufacturing a copper-coated composite contact wire according to an example of the present invention using the above-described method and testing its characteristics will be explained together with the results of testing the characteristics of contact wires according to comparative examples and conventional examples. Table 1 below shows Examples 1 to 3 and Comparative Example 1.
, 2 and Conventional Example 1゜2, and the results of each test are shown.

The cross-sectional area of each test material is 110-, and Conventional Example 1 is a copper single wire trolley, and Conventional Example 2 is a copper alloy single wire trolley. In addition, since all of the Examples, Comparative Examples, and Conventional Examples were good in terms of fitting ability, the test results are not listed in Table 1.

Table 1: When the tensile strength of the trolley is increased so that the overhead wire tension can be increased, the wear resistance is also improved at the same time. This is because once the outer copper is worn away and the inner copper alloy begins to be exposed, it becomes difficult for the contact wire to wear out any further.

In the case of Comparative Example 2, where the copper coverage is too low, 50% IACS
In the case of Comparative Example 1 in which the above conductivity cannot be ensured and the copper coverage is too high, the wear resistance is low. Further, the pure copper contact wire of Conventional Example 1 and the copper alloy single wire of Conventional Example 2 have low strength and low wear resistance.

On the other hand, Examples 1 to 3 are excellent in electrical conductivity, strength, and wear resistance.

[Effects of the Invention] As explained above, according to the present invention, the copper alloy of the core material is C
r, Zr, A, &, Ni, Fe, Zn.

Since it contains one or more elements selected from Co, Ag, Si, Ti, and Sn in a total concentration of 3 to 15%, a contact wire with high strength, high wear resistance, and high corrosion resistance is obtained. be able to. In addition, this core copper alloy contains 0.00 Pb.
Since the copper content is 0.5 to 1%, the machinability is good and the surface cleaning treatment by cutting is easy, and it is possible to stably coat copper in the dip forming process. Furthermore, since this core material is coated with copper at a cross-sectional area ratio of 20 to 65%, it is possible to ensure electrical conductivity of 50% lAC3 or more, and even if the current mounting hardware is used as is, it has excellent corrosion resistance. there is no problem.

Since the copper-coated composite contact wire according to the present invention has high strength, it is possible to increase the tension of the overhead wire, thereby increasing the wave propagation speed and making it possible to operate the train at higher speed than before.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a dip forming device used for manufacturing a copper-coated composite wire according to an embodiment of the present invention, and FIG.
The figure is a cross-sectional view of a copper-coated composite contact wire. 1; Copper alloy wire, 2; Composite wire, 3; Core material, 4; Covering material, 1
2; Peeling die, 13; Capstan, 22; Crucible

Claims (1)

[Claims] In a copper-clad composite contact wire in which a copper alloy is used as a core material and the periphery of this core material is coated with copper, the copper alloy of the core material is 0.05
Contains Pb to 1% by weight, and also contains Cr, Zr, A
l, Ni, Fe, Zn, Co, Ag, Si, Ti and S
Copper containing one or more elements selected from n at a total concentration of 3 to 15% by weight, and the coating material has a coverage of 20 to 65% in terms of cross-sectional area ratio. Covered composite contact wire.