JPH10250419A - Vibration isolating trolley wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire rod having high vibration damping performance, reduce a wire separating factor between a trolley wire and a current collector device of an electric car, without deteriorating various requirements. SOLUTION: This vibration isolating trolley wire is formed by compounding a vibration isolating alloy 2 of 0.05 or more value (1/Q) of internal friction with tension in a 10 to 50MPa range and a conductive material 3. As the vibration isolating alloy 2, a ferromagnetic vibration isolating alloy as Silentalloy(R) and Gentalloy(R) can be used. As the conductive material 3, an alumina dispersed reinforced copper alloy of alumina particle with grain size from 10<-7> to 10<-9> is suited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trolley wire for an electric railway having high vibration damping performance.

[0002]

2. Description of the Related Art A trolley wire is an important element of an electric railway that supplies stable electric power via a current collector of an electric car (train), and is mounted in the air on a running track.

Conventionally, in such a power supply system, the trolley wire vibrates due to contact with a current collector of a running train, so that the trolley wire and the current collector are separated (separated from each other), and the current is collected. Sometimes it was intermittent. If the current collection is intermittent, not only the comfort such as stable running and acceleration of the train is impaired, but also the electric device of the train may be affected.

[0004] As a countermeasure, vibration is prevented by applying tension when laying the trolley wire and holding the trolley wire near the center of the track using a stay. Improvements have also been made to train current collectors and new trolley wire materials.Trolley wires made of copper and copper alloy, which have been strengthened by cold working, and the outside of steel wires are made of copper or copper alloy. Coated high-strength composite trolley wires have been put to practical use.

[0005]

However, due to the remarkable speeding up of railways in recent years, there is a concern that the conventional trolley wire described above may have a sharp increase in the rate of separation from the current collector.
In other words, increasing the speed of the railway means that the traveling speed of the current collector increases, and as a result, the difference between the vibration propagation speed on the trolley wire and the traveling speed of the current collector decreases, and the trolley line and the current collector There was a possibility that the amount of wire separation from the device would increase significantly.

Further, as a measure against derailment in a high-speed train, the elasticity and density of the material forming the trolley wire are changed.
A method of making the vibration propagation speed of the trolley wire significantly different from the traveling speed of the current collector has also been considered. However, such stiffening of the trolley wire, changes in elastic modulus and density,
Other properties, such as electrical properties, arc resistance, weather resistance,
There are limitations in terms of workability and cost of the overhead wire, and it has been difficult to achieve the purpose of reducing the wire breakage rate.

That is, the vibration propagation speed of the trolley wire is represented by C
Then, it is known that the following relational expression holds.

[0008]

(Equation 1) In the equation, S represents a force for returning the medium to a rest position, and σ represents the inertia of the medium.

Here, the force (S) for returning the trolley wire as a medium to a rest position means the tension at the time of erection, and the quantity (σ) representing the inertia of the medium means the density of the trolley wire. ing. If the current trolley wire material is made of a high-strength copper alloy with the highest tensile strength (550MPa), if it is attempted to secure a vibration propagation speed C higher than that for a 350km / h high-speed train, A very high value of about 600 MPa was required as the tension of the alloy, and it was impossible to install the alloy because of the tensile strength (550 MPa) of this alloy.

As is apparent from the above equation, it is effective to decrease the density of the trolley wire in order to increase the vibration propagation speed C, but it is necessary to reduce other characteristics required for the trolley wire. Therefore, it was difficult to select a material that reduced only the density.

The present invention has been made in view of the above points, and provides a wire having high vibration damping performance without impairing various characteristics required for a trolley wire, and a current collector for a running train. An object of the present invention is to reduce the trolley wire detachment rate by suppressing or quickly attenuating the vibration of the trolley wire caused by the contact between the device and the trolley wire.

[0012]

Means for Solving the Problems The present inventors have developed a trolley wire itself that has a high vibration damping property in addition to the conventional method of applying a tension at the time of the overhead wire and preventing vibration caused by a stay as a countermeasure for disconnection of the trolley wire. The present inventors have found that by providing the same, it is possible to reduce the disconnection rate between the current collector of the train and the trolley wire even in a high-speed electric railway, and have completed the present invention.

That is, the vibration-damping trolley wire of the present invention is a composite of a vibration-damping metal or alloy having an internal friction value (1 / Q) of 0.05 or more in a tension range of 10 to 50 MPa and a conductive material. It is characterized by having.

In general, a vibration-proof metal is a metal (including an alloy) whose vibration is attenuated by friction inside the material, and absorbs vibration energy applied from the outside due to magnetic-mechanical hysteresis loss of a ferromagnetic material. Ferromagnetic anti-vibration alloy, dislocation-type anti-vibration alloy that absorbs vibration by irreversible motion of hexagonal bottom slip dislocation, twin-type anti-vibration alloy that absorbs vibration by irreversible motion of twin interface, Alternatively, among alloys composed of two or more phases, there is a composite type vibration damping alloy that absorbs vibration by mutual friction loss at a phase interface.

As a ferromagnetic type anti-vibration alloy, for example, Cr 5
~ 20wt%, Al 0.1 ~ 10wt%, the balance of Fe-
Cr-Al alloy (Silentalloy of Toshiba Corporation),
Fe-Cr-Mo-Al-based alloys (for example, Gentaloy of Sumitomo Special Metals), 12Cr steel, Co-Ni-based alloys (for example, Nivco-10 of Westinghouse), or high-purity Fe or high-purity Ni Can be Further, as a dislocation type vibration damping alloy, high-purity Mg, Mg-Zr alloy, Mg-M
g ₂ Ni-based alloys.
n-Cu-Al-Fe-Ni alloy, Cu-Mn-AI
(-Sn) -based alloy, Cu-Zn-Al-based alloy, Ni-T
An i-based alloy or a Cu-A1-Ni-based alloy may be used. Further, examples of the composite type vibration damping alloy include gray cast iron and Al-Zn based alloy.

In general, a vibration-isolating alloy has a property that the vibration-damping property decreases as the stress increases. When the trolley wire of the present invention is erected, a method of suppressing the derailment by applying a high tension to increase the vibration propagation speed and increasing the difference from the traveling speed of the train is also performed. Therefore, in the trolley wire of the present invention, a vibration-proof alloy having a high vibration damping ability with a value of internal friction of vibration (1 / Q) of 0.05 or more in a tension range of 10 to 50 MPa added during overhead wire is used. You.

In the present invention, it is desirable to use copper or a copper alloy having both high conductivity and strength as the conductive material. Such copper or copper alloys include:
Cu-S with hard copper and Sn added at a ratio of 0.2-1.5 wt%
Examples include an n-based alloy, a Cu-Zr-Cr-based alloy, and an alumina dispersion strengthened copper alloy in which alumina particles are uniformly dispersed.

In general, there are two mechanisms for strengthening a copper alloy: solid solution strengthening and precipitation strengthening. Because the added element dissolved in copper significantly inhibits conductivity, it is difficult to achieve both high strength and high conductivity by solid solution strengthening,
In precipitation strengthening, the additive element dissolved in copper is precipitated as a fine precipitation phase by a precipitation treatment, so that the base is strengthened and purified at the same time, and the conductivity is restored. Therefore, the mechanism of precipitation strengthening is suitable for increasing the strength,
Among the copper alloys, the use of an alumina dispersion strengthened copper alloy is particularly desirable.

In the alumina-dispersion-strengthened copper, the particle size of the alumina particles dispersed as precipitates is from 10 ^-7.
It is desirable to be 10 ^-9 m. That is, the particle size is 10 ^-9 m
With smaller alumina particles, dislocations cannot be fixed, and the deformation stress of the material is reduced, so that the strength cannot be sufficiently increased. Moreover, precipitates and when the lattice constant of the matrix phase metal are different, precipitates elastic strain field called strain matching occurs around, but this increases the deformation stress hinder dislocation motion, the particle size of the precipitate 10 ^- If it is larger than ⁷ m, this effect is rather small and the strength is reduced.

In the trolley wire of the present invention, as a method of combining copper or a copper alloy having such high conductivity and high strength with the vibration-proof alloy, for example, a billet of copper alloy and a vibration-proof alloy are used. Insert each billet into the same container, or insert a vibration-proof alloy billet into a copper alloy tubular billet into the container,
Closed extrusion method in which pressurization is made to flow out of a die and molding, open extrusion processing method in which extrusion is performed without using a container, such as cold extrusion shaft drawing, billets made of copper alloy and vibration-proof alloy Simultaneously with hot working, or a drawing method in which after hot working, the sheet is further drawn through a die at room temperature.

Further, there is also a method in which a vibration-proof alloy and a copper alloy are processed into a wire having a predetermined cross-sectional shape, and the joining surfaces are joined to be joined by heat treatment. Further, for example, a composite of two or more kinds of vibration-proof alloys or alloys having other functions. For a trolley wire further compounded with a copper alloy, a composite billet incorporating an anti-vibration alloy is made into a wire by, for example, drawing, and then the surface is electroplated with a copper alloy, a pipe cladding, DFP (Dip Forming Processes).
s) and the like.

In the trolley wire of the present invention, since the vibration isolating alloy having high vibration damping performance is compounded, the vibration of the trolley wire caused by the contact between the current collector of the running train and the trolley wire is suppressed. In this case, the rate of disconnection between the current collector of the train and the trolley wire can be significantly reduced.

The conductivity, which is a basic property required for a trolley wire, is borne by copper having high electrical conductivity or an alloy containing copper as a main component. It can be handled separately, making material design easy, and other characteristics that were often impaired by conventional measures against wire breakage, such as electrical characteristics such as conductivity, arc resistance, weather resistance, etc. No drop occurs.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 are cross-sectional views showing an embodiment of a vibration-insulating trolley wire according to the present invention.

In the embodiment shown in FIG. 1, two grooves 1 for supporting with stays each have a grooved shape formed along the longitudinal direction on the side peripheral surface. The upper part has an internal friction value of 0.05 or more (1/1 /
Q) is a vibration-proof alloy, for example, Silentalloy, and the lower portion is made of a copper alloy having both high conductivity and high strength, such as an alumina dispersion strengthened copper alloy. And a base 3 made of a copper alloy,
It has a composite integrated structure. In the embodiment shown in FIG. 2, a round shape (circular cross section) made of a copper alloy having both high conductivity and high strength such as an alumina dispersion strengthened copper alloy is used.
A covering portion 5 made of a vibration-proof alloy such as silentalloy is provided on the upper portion of the wire 4, and has a structure in which these are combined and integrated. These trolley wires are, for example, a copper alloy billet and a vibration-proof alloy billet inserted in the same container, or a copper alloy tubular billet fitted with a vibration-proof alloy billet. It is manufactured by a closed extrusion method in which the material is inserted into the inside, and then pressurized and discharged from a die.

Further, in the trolley wire shown in FIG. 3, a copper wire having both high conductivity and high strength, such as alumina dispersion strengthened copper alloy, is provided on the entire outer periphery of the round wire 6 made of a vibration-proof alloy such as Silentalloy. A coating portion 7 made of an alloy is provided;
These have a structure in which they are integrally combined. This trolley wire is manufactured, for example, by hollowing out a billet of an alumina dispersion strengthened copper alloy into a tube, fitting a billet made of silentalloy therein, and subjecting the billet to tension processing.

In the trolley wires of these embodiments,
A vibration isolator made of an anti-vibration alloy with high vibration damping performance is provided in the upper part or central part, so that vibration of the trolley wire during running of a train or the like can be suppressed or attenuated quickly, and current collection The disconnection rate between the device and the trolley wire can be reduced. In addition, since a round or irregular base or surface coating made of a copper alloy having both high conductivity and high strength is provided as a portion in contact with the current collector, the high conductivity required for a trolley wire is provided. It has nature.

Next, another embodiment of the present invention will be described.

In the trolley wire shown in FIG. 4, a coating 7 made of a copper alloy such as an alumina dispersion strengthened copper alloy is integrally formed on the entire outer periphery of a round wire 8 made of a composite including a vibration-proof alloy such as a silentalloy. Has a composite structure.
Here, as the composite containing a vibration-proof alloy, a wire rod obtained by combining a super-strength steel or a maraging steel with a vibration-proof alloy, or a wire rod obtained by combining a low-density carbon fiber or a Ti alloy with a vibration-proof alloy is used. And the like. In the case of the former trolley wire using a composite material such as maraging steel at the center, the tensile strength is improved, and it is possible to take measures against wire detachment that applies higher tension. Further, in the case of the latter trolley wire using a composite material such as carbon fiber, the density of the entire trolley wire is lower, so that there is an effect that the vibration propagation speed is improved, and thereby the detachment ratio is further reduced.

FIGS. 5 (a) and 5 (b) show the structure of a trolley wire using a composite of maraging steel and silentalloy which is a vibration-proof alloy at the center. FIG.
The trolley wire shown in (a) has a structure in which a copper coating layer 11 is formed on a composite in which a composite coating portion 10 of silentalloy is provided on a center wire 9 made of maraging steel. After processing sirentaloy into a tubular shape, insert a billet of maraging steel into the hollow part, draw it and integrate it into a composite, then dip this composite into a molten copper bath to form a copper layer on the surface Manufactured in a manner that

The trolley wire shown in FIG.
The center composite has a structure in which a wire rod 12a made of maraging steel and a wire rod 12b made of silentalloy, each having a semicircular cross section, are integrally joined. For example, a billet made of maraging steel and a billet made of silentalloy Are simultaneously drawn and composite-integrated, and then the composite is dipped in a molten copper bath to form a copper layer on the surface.

Further, by combining a plurality of vibration-proof alloys, it is possible to obtain a trolley wire which satisfies not only vibration damping performance but also other required characteristics such as tensile strength and coefficient of thermal expansion. For example, when high vibration isolation characteristics and strength are required, gray cast iron and Cu-Al-Ni or Mn
It is effective to use a composite material obtained by compounding with a Cu-based anti-vibration alloy.

An embodiment of a trolley wire in which a plurality of such vibration-proof alloys are combined and combined will be described below. That is,
In the trolley wire shown in FIG. 6, a copper such as an alumina dispersion strengthened copper alloy is provided on the outer periphery of a composite in which a composite covering portion 10 made of silentalloy is provided on the outer periphery of a center wire 13 made of magnesium having the highest vibration damping property. A coating portion 7 made of an alloy is formed, which is extremely excellent in vibration isolation and has high conductivity. This trolley wire is, for example, first processing a silentalloy into a tubular shape, then filling the hollow portion with magnesium, inserting the obtained composite into a tubular billet made of an alumina dispersion strengthened copper alloy, and drawing it out. It is manufactured by molding integrally.

[0035]

EXAMPLES Specific examples of the present invention will be described below.

Examples 1 to 4 Silentalloy (Cr 12 wt% -Al 3 wt% -remaining Fe), which is a Fe-Cr-Al-based vibration damping alloy, and copper or a copper alloy shown in Table 1 were subjected to the method shown in the same table. The composite wire having a cross-sectional shape shown in FIG. 1 and having a cross-sectional area of 110 mm ² was manufactured.

Next, the obtained composite wire was examined for characteristics required as a trolley wire, such as tensile strength, conductivity, heat resistance, wear characteristics, vibration damping rate, and relative linearity. In addition, the same characteristics were examined for the current grooved hard copper trolley wire (Comparative Example 1) and the grooved tin-containing alloy trolley wire (Comparative Example 2) manufactured by cold working. Table 2 shows the results of these measurements.

The conductivity is shown as a percentage with respect to the conductivity of IACS. Heat resistance is measured from room temperature to 700
After holding at various temperatures up to ℃ for one hour, the temperature at which annealing softens in a tensile test is measured, and the wear characteristics are measured using a rotary wear tester with a DC current of 50 A applied. Rubbing with a sintered alloy sliding plate,
The measurement was performed by measuring the amount of wear after 20,000 revolutions.
In addition, the measurement of vibration damping rate (intrinsic damping power SPD)
This was performed by measuring a decay rate by shaking a line of a fixed length. Furthermore, in the measurement of the derailment rate, a running test was carried out using the trolley wires obtained in Examples and Comparative Examples to actually run a high-speed mobile at a speed of 350 km / h, The number of disconnections from the current collector was examined per unit distance. Then, the ratio to the number of times of disconnection of the working grooved hard copper trolley wire (Comparative Example 1) was shown as a specific disconnection rate.

[0039]

[Table 1]

[Table 2] As can be seen from Table 2, the trolley wires obtained in Examples 1 to 4 have significantly improved anti-vibration properties as compared with the current grooved hard copper trolley wire and the grooved tin-containing alloy trolley wire,
2. Description of the Related Art The rate of disconnection between a current collector and a high-speed moving body such as a train has been greatly reduced. In addition, other characteristics are as good as the current trolley wire.

Examples 5 to 7 In Example 5, billets of an alumina dispersion strengthened copper alloy were hollowed out into a tube, and then a billet of silentalloy (Cr 12 wt% -Al 3 wt% -remainder Fe) was fitted into the hollow portion. It is compounded, and this is stretched, and the cross-sectional area is 110 mm ²
Was manufactured.

In Example 6, a billet of silentalloy and a billet of maraging steel were simultaneously drawn and composited and integrated, and then dipped in a molten copper bath to form a copper layer on the surface. A round composite wire having an area of 110 mm ² was produced.

Further, in Example 7, after the silentalloy was processed into a tubular shape, the hollow portion was filled with magnesium, and this composite was inserted into a tubular billet made of an alumina dispersion-strengthened copper alloy, and integrally formed by drawing. It was molded to produce a round composite wire having a cross-sectional area of 110 mm ² .

Next, the tensile strength, conductivity, heat resistance, abrasion characteristics, vibration damping rate and relative linearity of the thus obtained round composite wire were examined in the same manner as in Examples 1 to 4, respectively.
These measurement results are shown in Table 3 together with the characteristics of the working grooved hard copper trolley wire (Comparative Example 1).

[0044]

[Table 3] As can be seen from Table 3, the round trolley wires obtained in Examples 5 to 7 have remarkably improved anti-vibration characteristics as compared with the current grooved hard copper trolley wire, and current collection of high-speed moving bodies such as electric trains. The rate of disconnection from the device is greatly reduced. In addition, other characteristics are as good as those of the current trolley wire.

[0045]

As described above, the trolley wire of the present invention has various characteristics required as a trolley wire, and also has a higher vibration damping property than the conventional one. Therefore, according to this trolley wire, the vibration of the trolley wire caused by the contact with the current collector of the running train is suppressed or rapidly attenuated, and the disconnection rate between the current collector and the trolley wire is reduced. It is greatly reduced and a stable power supply is realized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a vibration-proof trolley wire of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the vibration isolating trolley wire of the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of the vibration-isolating trolley wire of the present invention.

FIG. 4 shows a composite including a vibration-proof alloy in the center.
FIG. 2 is a cross-sectional view showing an embodiment of the vibration-proof trolley wire of the present invention.

FIG. 5 is a cross-sectional view showing the structure of a trolley wire having a composite of maraging steel and silentalloy.

FIG. 6 is a cross-sectional view showing an embodiment of the present invention having a composite of a plurality of vibration-proof alloys.

[Explanation of symbols]

 2 ... crown-shaped part made of anti-vibration alloy 3 ... base made of high-conductivity, high-strength copper alloy 4 ... round wire made of high-conductivity, high-strength copper alloy 5 ... Coating part 6 made of vibration damping alloy 6 Round wire made of vibration damping alloy 7 Coating part made of copper alloy having high conductivity and high strength 8 Round part made of composite containing vibration damping alloy Wire 9 Central wire made of maraging steel 10 Composite covering part of silentalloy 11 Copper coating layer 13 Center wire made of magnesium

Claims (2)

[Claims] An anti-vibration property characterized by combining a conductive material with a vibration-proof metal or alloy whose internal friction value (1 / Q) is 0.05 or more in a tension range of 10 to 50 MPa. Trolley wire. 2. The conductive material has a particle size of 10 ^-7 to 10 ^-9.
2. The vibration-damping trolley wire according to claim 1, wherein the alumina particles of m 2 are alumina dispersion strengthened copper uniformly dispersed.