JPS5839532A - Combined trolley wire - Google Patents

Abstract

PURPOSE:To attain high wear resistance and electric conductivity, by dispersing alumina in copper or aluminum to provide a reinforced alloy contg. dispersed grains for coating a steel core. CONSTITUTION:Semi-molten aluminum is cooled while being stirred, so that aluminum powder is produced. The aluminum powder is mixed with about 10- 40% of alumina. The mixture is sintered and extruded so that an aluminum alloy billet containing the alumina is produced. The aluminum alloy 3 is extruded on a steel core 1 to coat it. A combined trolley wire is thus manufactured. The wear resistance of the wire is heightened by the hardness of the alumina in accordance with its content. However, if the content is too high, the electric conductivity falls. For that reason, the alumina content of the alloy 3 is normally set at 30-40%.

Description

[Detailed description of the invention] The present invention relates to improvements in composite trolley wires.

Generally, hard copper is used as the trolley wire material.

However, as the speed of trains increases or the number of trains runs increases, the wear of trolley wires becomes more severe and the replacement cycle becomes shorter. Therefore, in order to improve the wear resistance of hard trolley wires, as shown in Figure 1, a material with high strength and excellent wear resistance such as copper is used as the core material 1, and the outer periphery of the material is made to be more conductive than the core material. Excellent aluminum or aluminum alloy (
A composite trolley wire equipped with aluminum (hereinafter referred to as aluminum) has now appeared. However, since aluminum has poor abrasion resistance, aluminum wears out in a short period of time while being used as a trolley wire, as shown in FIG. 2. If it comes into contact with the slotted plate in this state, there is not only a risk of groove wear on the slotted plate, but also an arc will be generated between the aluminum and the slotted plate, and this arc will accelerate the wear of the aluminum. there were.

In the present invention, as a result of extensive research aimed at improving these drawbacks, we have discovered a composite trolley wire that exhibits excellent abrasion resistance without reducing conductivity. That is, the present invention relates to a composite trolley wire in which a conductive metal is coated on the outside of a core material made of steel. It was formed by

The reason why alumina was particularly selected in the present invention is that alumina has excellent hardness and excellent wear resistance. The amount of alumina dispersed within the aluminum base material is not particularly limited; as the amount is increased, the wear resistance improves, but on the other hand, the conductivity decreases. Therefore, the addition t of alumina is usually 30 to 40
It is about 1.

Next, examples of the present invention will be described.

Example Aluminum is heated to about 600-'C and in a semi-molten state is cooled with stirring to form a powder. Thereafter, LO to 4 (l) of alumina was added and mixed, and the mixture was sintered to obtain an extruded vinylet-shaped alumina-containing aluminum dispersion alloy.

As shown in FIG. 3, the above-mentioned alloy 3t is coated on the outer periphery of the copper core material 1! 7 extrusion coating to obtain a composite trolley wire of the present invention.

FIG. 4 shows the results of measuring the wear resistance of the trolley wire of the present invention thus obtained and a composite trolley wire (conventional product) having a core made of steel and coated with aluminum on the outside.

The test method is to attach a trolley wire to a rotating disk.
A pick plate made of iron-based sintered alloy is brought into contact with a pressing force of 5 Yu,
The wear ii was measured after 6 months. As is clear from Figure 4, the conventional product showed a wear amount of about 5 in 80 days, but in the product of the present invention, when 30 t of alumina was mixed, the amount of wear was 201, 10- when 409g of alumina is mixed
The wear resistance was significantly improved. Although the electrical conductivity was slightly lower than that of aluminum alone, it did not cause any trouble as a trolley wire.

As detailed above, according to the present invention, since a composite trolley wire with excellent conductivity is provided in a wear-resistant pot, it can be used for a long period of time, and is extremely useful as this type of equipment.

[Brief explanation of the drawing]

FIG. 91 is a cross-sectional view of a conventional composite trolley wire, FIG. 2 is a cross-sectional view showing the state of the conventional composite trolley wire during use,
Fig. 3 is a cross-sectional view showing an example of the composite trolley wire of the present invention, and Fig. 4 is a relationship curve diagram between the alumina content in aluminum and the amount of wear. Fig. 1 Fig. 2 Fig. 3 Fig. 4 `` Snoring

Claims (1)

[Claims] A composite trolley wire consisting of a core material made of steel coated with a conductive metal on the outside, the conductive metal being made of a dispersed particle reinforced alloy reinforced by dispersing alumina in a base material of copper or aluminum. A composite trolley line characterized by: