KR102033910B1 - A friction material for trolley wire in electric rail car, and its manufacturing method - Google Patents

Abstract

Provided are a current collecting material for electric rolling of a rolling stock of a rolling stock and a method of manufacturing the same.
The present invention is, in mass%, Cu: 82 to 87%, Sn: 4 to 8%, Cu ₃ P: 0.5 to 1.5%, graphite: 3 to 7%, Cr: 0.3 to 1.5%, MnS: 0.5 to 1.5 The present invention relates to a current collector material for sliding of a Trolley wire electric vehicle including%, coke: 1.0 to 2.5%, and Fe-Ti: 2.0 to 3.5%.

Description

Trolley wire sliding current collector material and its manufacturing method {A friction material for trolley wire in electric rail car, and its manufacturing method}

The present invention relates to the manufacture of electric current collecting material for electric vehicle Trolley wire sliding, and more particularly, to a current collecting material for electric rolling motor that is widely used as a public transport means, the electric current collector performance and durability Trolley The present invention relates to a wire current collector material and a method of manufacturing the same.

Trolley wire installation method for supplying electricity to electric vehicles, which can be classified into the upper, lower and third ^rd rails of electric vehicles, and the current collecting performance of wet current collector materials applicable to the characteristics of Trolley wire and environment In addition, there is a demand for developing a current collector material for sliding Trolley wire for improved durability.

In general, the performance required for current collector materials is largely related to mechanical and electrical performance.

It is different and is as follows. 1) Good conductivity and sufficient current collecting capacity, 2) Low wear of trolley wire, 3) Low wear and long service life of current collector material, 4) Mechanical strength, 5) Arc resistance 6) containing no harmful or pollutants and will not occur. In order to meet the above required performance, the components of the current collector may be classified into three types. 1) current collecting component, 2) wear resistant component and 3) lubricating component.

As the current collecting component, Cu having high electrical conductivity is widely used for industrial purposes. As the current collector component sintering reinforcing agent, Sn is mainly added to improve the structure density and mechanical properties of the current collector material. In addition, the wear-resistant component is added for the purpose of minimizing mutual plastic deformation occurring when the current collector component is rubbed with the Trolley wire and dispersed on the surface to reduce wear of the Trolley wire and the current collector material. In addition, it is necessary to have a component that does not cause a combustion reaction due to the arc generated by the two wires of the trolley wire and the current collector material.

In addition, the lubricating component is a solid component and a liquid component. It is added for the purpose of reducing the friction coefficient of the trolley wire and the current collector material by reducing the coefficient of friction during friction between the trolley wire and the current collector material. The added lubricating component needs to be free from alloying which can react with the current collecting component or the wear resistant component to change the electrical mechanical properties. In general, the more lubrication components, the less Trolley wire wear is, but the mechanical strength of the current collector material is lowered and the mechanical wear is increased, so considering that sufficient strength is required during operation, the lubrication component content of the current collector material is limited. Therefore, in order to replenish the lubricating component contained in the current collector material, a solid lubricant is used together with the current collector material, and is widely used in a very effective manner.

As the prior art related to such a current collector material for rolling trolley wires of the electric vehicle, the inventions described in Korean Patent Registration No. 2000-31027, Patent Application No. 10-2005-0045792, and Patent Registration No. 10-1683666 are mentioned.

Patent Registration No. 2000-31027 discloses a current collecting material composed of a current collecting component Cu 82-88%, a current collecting component sintering reinforcing agent Sn 8-12%, a lubricating component graphite 0.5-3%, and a wear-resistant component 4-7%. Doing. However, the durability of the patent is difficult to improve the durability of the current collector material due to the addition of the wear-resistant component and the current collector component sintering reinforcement agent to the lubricating component to increase the wear of the Trolley wire, as well as to decrease the dense structure of the wear-resistant component compound. .

In addition, the current collector material of the patent application No. 10-2005-0045792 is composed of the current collector component Cu 80 ~ 92%, the current collector component sintering agent Sn 3 ~ 8%, lubricating component graphite 1-6%, wear resistance components 0.1-6% The wear resistant component is composed of at least one ferro alloy of Fe-Mo, Fe-Ti, Fe-Cr and at least one additive of Cr and Cu ₃ P.

In addition, the contact material of the Patent No. 10-1683666 is composed of the current collector component Cu 80 ~ 92%, the current collector component sintering enhancer Sn 3 ~ 8%, lubricating component graphite 1-6%, wear-resistant components 0.1-6%, The wear-resistant component is composed of at least one of Fe-Mo, Fe-Ti, Fe-Cr, ferro alloy and at least one of Cr. The additive particle size is 250 μm or less, and the particle size is 45 μm or less. The ratio which occupies with respect to all the additives is 30 to 50% by mass ratio. In addition, in addition to the additive, it is composed of further comprising a Cu ₃ P powder having a particle size of 1 ~ 200㎛.

However, in the above patents, the current collector material is limited to some elements of the wear-resistant component, and the durability of the current collector material is poor due to the high mechanical strength of the Trolley wire or the electrical mechanical wear depending on the horizontal and vertical sliding directions of the current collector material. there was.

Accordingly, the present invention has been made to solve the above-mentioned limitations of the prior art, and an object of the present invention is to provide a current collector material having excellent durability and a method of manufacturing the current collector material regardless of the height of the trolley wire and the horizontal and vertical sliding directions.

In addition, the technical problems to be achieved in the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above are clearly understood by those skilled in the art from the following description. Could be.

The present invention for achieving the above object,

In its own mass%, Cu: 82 to 87%, Sn: 4 to 8%, Cu ₃ P: 0.5 to 1.5%, graphite: 3 to 7%, Cr: 0.3 to 1.5%, MnS: 0.5 to 1.5%, coke The present invention relates to a current collecting material for sliding of a rolling stock of a rolled wire of an electric vehicle including: 1.0 to 2.5% and Fe-Ti: 2.0 to 3.5%.

In the present invention, the sliding current collector material may have a lubricating film layer formed by being impregnated into the machine oil which is a liquid component lubricant.

In addition, the present invention,

In its own mass%, Cu: 82 to 87%, Sn: 4 to 8%, Cu ₃ P: 0.5 to 1.5%, graphite: 3 to 7%, Cr: 0.3 to 1.5%, MnS: 0.5 to 1.5%, coke A process for preparing a mixed powder comprising: 1.0-2.5% and Fe-Ti: 2.0-3.5%;

Preparing a molded article having a predetermined shape using the mixed powder, and then reducing and sintering at 700 to 850 ° C under ammonia decomposition gas or hydrogen gas atmosphere; And

Impregnating the sintered body manufactured from the above into the mass% with respect to the sintered compact in 1.0 to 2.5% of machine oil; It relates to a method for manufacturing a current collecting material for electric vehicle Trolley wire sliding.

In addition, the present invention,

In the sliding collector current collector assembly is composed of a solid lubricant is inserted between the rolling material for the electric vehicle Trolley wire,

The sliding current collector is mass%, Cu: 82 to 87%, Sn: 4 to 8%, Cu ₃ P: 0.5 to 1.5%, graphite: 3 to 7%, Cr: 0.3 to 1.5%, MnS: 0.5 ~ 1.5%, coke: 1.0-2.5% and Fe-Ti: 2.0-3.5%, and

The solid lubricant relates to a current collector assembly for electric vehicle Trolley wire sliding, characterized in that the pure carbon material or polymer resin.

When using the pure carbon material as a solid lubricant, it is preferable to use by impregnating machine oil in the range of 3.0 to 5.5% by mass% relative to the current collector for sliding.

In addition, the polymer resin material is preferably a polypropylene-based or polyethylene-based resin.

As described above, the present invention is prepared by mixing each raw material consisting of the current collector component, current collector component sintering enhancer, abrasion resistance component, lubrication component to the optimum conditions to produce a mixed powder, and then molding the mixed powder into a predetermined shape After sintering under appropriate heat treatment conditions, a current collector material may be manufactured by impregnating a certain amount of liquid lubricant.

In addition, by using the Trolley wire material characteristics, pure carbon solid lubricant impregnated with machine oil, or a solid lubricant such as polypropylene-based or polyethylene-based polymer resin, for assembling the current collector, Durable current collector materials can be provided.

1 is a metal optical micrograph (× 50) of a metal optical microscope of a current collector prepared by the method of the present invention.
Figure 2 (ab) is a photograph of the wear resistance test assembly of the current collector produced by the present invention.
Figure 3 (ab) is a photograph of the exterior of the current collector produced by the present invention by successful electric vehicle suspension test.

Hereinafter, the present invention will be described.

The electric current collector material for rolling trolley wire sliding of the present invention is a mass% of itself, Cu: 82 to 87%, Sn: 4 to 8%, Cu ₃ P: 0.5 to 1.5%, graphite: 3 to 7%, Cr: 0.3 ~ 1.5%, MnS: 0.5-1.5%, coke: 1.0-2.5% and Fe-Ti: 2.0-3.5%.

Hereinafter, the compositional components of the current collecting material for sliding Trolley wire electric vehicle of the present invention and the reason for limiting the content thereof, where the unit of the content is mass%.

First, the current collector material for sliding of the present invention contains Cu in the range of 82 to 87%. If the Cu content is less than 82%, the current collector performance is lowered, if it exceeds 87%, the current collector performance is improved, but because the content of the additive to increase the durability is limited, it is difficult to expect the effect.

In the current collecting material for sliding of the present invention, Sn and Cu ₃ P are added as a current collector component sintering enhancer. At this time, it is preferable to limit the Sn content to 4-8%. If the Sn content is less than 4%, it is difficult to form a dense sintered structure due to the effect as a sintering enhancer, and when it exceeds 8%, the sintered structure is strengthened and the wear of the trolley wire is increased. This is because it is difficult to expect the durability effect since it affects the wear resistance and the amount of wear and lubricant added.

In addition, the Cu ₃ P content is preferably limited to 0.5 to 1.5%. If the Cu ₃ P content is less than 0.5%, the effect of sintering density is small. If the Cu ₃ P content is more than 1.5%, the sintering densification of the current collector component is affected by the reaction during sintering. It is effective to limit it to less than 1.5%.

Wear-resistant components of the current collector material for sliding of the present invention are Fe-Ti and Cr.

The Fe-Ti has hard properties as an intermetallic compound, and the Fe-Ti content is preferably 2.0 to 3.5%. If the Fe-Ti content is less than 2.0%, the wear resistance is inferior. If the Fe-Ti content is more than 3.5%, the sinter densification and trolley wire wear of the current collector during sintering are affected.

And the Cr content is preferably limited to 0.3 ~ 1.5% range. Cr has an effect on the electrical arc as a wear resistance of the current collector material. If the Cr content is less than 0.3%, the electrical wear due to the arc resistance decreases, and if the Cr content exceeds 1.5%, the hardness of the current collector material increases, which may cause the wear of the trolley wire.

In addition, the sliding current collector material of the present invention includes graphite, coke, and MnS components as lubricating components.

The graphite content is preferably in the range of 2.5 to 4.5%. If the graphite content is less than 2.5%, the lubrication effect is reduced, the current collector material durability is lowered, and the formation of the Trolley wire surface sliding lubricating film may be degraded, causing wear. If it exceeds 4.5%, it is effective to limit the density to 4.5% by inhibiting the densification of tissue of the current collecting component, increasing mechanical strength and electrical resistance, and lowering current collection performance.

The coke content is preferably in the range of 1.0 to 2.5%. It is added as a lubricant to reduce the influence on the poor lubricating film and the densification of the tissue during sintering. If the coke content is less than 1.0%, the lubricating effect is reduced as an alternative additive to the disappearance of graphite due to arc generation. If the coke content is more than 2.5%, it is effective to limit it to 2.5% or less by increasing the sintering densification and electrical resistance of the current collecting component.

The MnS content is preferably 0.5 to 1.5%, and is excellent in high temperature stability and lubrication effect due to arc heat as a lubricant of a current collector component. If the MnS content is less than 0.5%, the lubrication effect is lowered, and if it exceeds 1.5%, the electrical resistance is increased to reduce the current collecting performance, so it is effective to limit it to 1.5% or less.

In the present invention, the sliding current collector material preferably has a lubricating film layer formed by being impregnated into the machine oil which is a liquid component lubricant. It is preferable to control the amount of machine oil to 1.0 ~ 2.5% when impregnated. If the amount of machine oil is less than 1.0%, the lubrication film formation over the entire surface of the current collecting material is reduced, and if it exceeds 2.5%, the lubrication film layer is formed thick, affecting current collection performance. Because it is crazy, it is effective to limit it to 1.0 ~ 2.5%.

In addition, the present invention, in the sliding current collector assembly in which a solid lubricant is inserted between the rolling material for electric vehicle Trolley wire sliding, the sliding current collector is in mass%, Cu: 82 to 87%, Sn: 4 to 8 %, Cu ₃ P: 0.5-1.5%, Graphite: 3-7%, Cr: 0.3-1.5%, MnS: 0.5-1.5, Coke: 1.0-2.5% and Fe-Ti: 2.0-3.5% And, the solid lubricant is related to the current collector assembly for electric vehicle sliding, characterized in that the machine oil impregnated pure carbon material or polymer resin.

The pure carbon material has a porosity and is used by impregnating machine oil. At this time, the mechanical oil content is preferably limited to 3.0 to 5.5%. If it is less than 3.0%, the Trolley wire lubricating film effect may be degraded and wear may be caused. If it exceeds 5.5%, it is effective to limit it to less than 5.5% because it may cause deterioration of current collection performance due to a decrease in strength and excessive lubricating film.

In addition, the polymer resin material is preferably a polypropylene-based or polyethylene-based resin. This material has the advantage of excellent lubricity and easy assembly work regardless of sliding or horizontal direction. Also, it is easy to form a homogeneous thin film on the surface of the trolley wire and the current collector during sliding, and has excellent function as a solid lubricant. .

As described above, the present invention is composed of two or more additives without relying on some elements in the sintering reinforcement, abrasion resistance, and lubrication to improve the durability of the current collector material according to the use environment of the rolled wire and the respective material characteristics. Complementary deficiencies of some elements are characterized by superior durability compared to the prior art.

Next, a method of manufacturing the current collector for sliding Trolley wire of the present invention will be described.

The present invention provides a method for manufacturing a current collector material for rolling a trolley wire according to the present invention, the method including: preparing a mixed powder having a composition as described above; Preparing a molded article having a predetermined shape using the mixed powder, and then reducing and sintering at 700 to 850 ° C under ammonia decomposition gas or hydrogen gas atmosphere; And impregnating 1.0 to 2.5% of the machine oil in the sintered body prepared above. It includes.

First, in the present invention, the mixed powder prepared as described above is press-molded into a predetermined shape at a pressure of 2 to 5 ton / cm ² , and reduced and sintered at a temperature of 700 to 850 ° C. in an ammonia decomposition gas or a hydrogen atmosphere. If the reduction and sintering temperature is lower than 700 ° C, the mechanical strength decreases due to the decrease of tissue densification. If the reduction and sintering temperature is higher than 850 ° C, the reduction and sintering temperature of the machine oil cannot be obtained because the mechanical strength is high and the porosity is lowered to obtain the mechanical oil content. It is effective to limit to 700 ~ 850 ℃.

In the present invention, the sintered body thus obtained is impregnated with a machine oil using a vacuum impregnator to obtain a current collector material having excellent lubricity and current collector performance as a current collector material having a lubricating film on its surface. At this time, in the present invention, when the impregnation of the machine oil content is preferably controlled to 1.0 ~ 2.5%, if the machine oil content is less than 1.0%, the lubrication film is formed over the entire surface of the current collector material, and if it exceeds 2.5%, the lubrication film layer is formed thick. Limiting to 1.0 ~ 2.5% is effective because it affects current collector performance.

In the present invention, when constituting the assembly using the electric current collecting material for electric rolling Trolley wire sliding as described above, it is possible to insert a solid lubricant between the sliding current collector.

In the present invention, the solid lubricant may be pure carbon material or polymer resin impregnated with machine oil. At this time, the pure carbon material has a porosity, so as to impregnate the machine oil is used, in this case, the machine oil content is preferably limited to 3.0 ~ 5.5%.

The polymer resin material is preferably polypropylene or polyethylene resin.

Through such a powder preparation and manufacturing process, the present invention can manufacture a sliding current collector material, and can be applied to future use environments of current collector materials regardless of horizontal or vertical sliding directions.

Hereinafter, the present invention will be described in detail through examples.

(Example)

To prepare a mixed powder having a composition as shown in Table 1. Thereafter, the mixed powder was press-molded to have a plate shape at a pressure of 2 to 5 ton / cm ² , and reduced and sintered at a temperature of 700 to 850 ° C. in an ammonia decomposition gas or a hydrogen atmosphere. Subsequently, the obtained sintered compact was impregnated with machine oil by the impregnation amount shown in Table 1 using the vacuum impregnation machine, and the electrical power collector material which has a lubricating film on the surface was manufactured.

The density, hardness, specific resistance, and impact strength of each current collector prepared as described above were measured, and the measured results are shown in Table 2.

In addition, the current collector prepared as described above was measured the wear amount of the current collector material and the Trolley wire using the wear resistance tester and the results are shown in Table 2.

Abrasion resistance test conditions include Trolley wire diameter ￠ 700mm, Trolley wire width 11m, rotation speed 80km / hr, current return material round trip distance 210mm, reciprocating speed 2m / min, applied current 500A, rolling force 6kgf, rainy season 20cc / min The amount of wear was measured after the driving test for 40 hours.

No
Component (mass%) Machine oil
content Remarks
Cu Sn Cu3P Fe-Ti Cr black smoke cokes MnS One 84 6 1.0 2.5 1.0 3.0 1.5 1.0 1.8 Inventive Example 1 2 83 7 0.5 2.5 1.5 3.0 1.5 1.0 1.9 Punishment 2 3 89 3.5 0.4 1.6 1.0 2.5 1.0 1.0 0.9 Comparative Example 1 4 80 9 1.0 2.5 1.0 5.0 0.5 1.0 1.1 Comparative Example 2 5 85 5 1.0 1.5 2.0 3.0 1.5 1.0 1.3 Comparative Example 3 6 85 5 1.0 3.0 1.0 4.0 0.5 0.5 1.4 Comparative Example 4 7 84 5 2.0 2.5 1.0 3.0 1.5 1.0 1.3 Comparative Example 5 8 86 5 1.5 2.0 1.0 2.5 1.0 1.0 1.2 Inventive Example 3 9 84 6 1.5 2.0 1.0 3.5 1.0 1.0 1.7 Inventive Example 4 10 87 4 1.0 2.5 1.0 2.5 1.0 1.0 1.1 Inventive Example 5 11 85 5 1.0 2.0 1.5 3.0 1.0 1.5 1.6 Inventive Example 6 12 84 6 1.0 2.5 1.0 3.0 1.5 1.0 1.8 Inventive Example 7 13 89 3.5 0.4 1.6 1.0 2.5 1.0 1.0 0.9 Comparative Example 6 14 80 9 1.0 2.5 1.0 5.0 0.5 1.0 1.1 Comparative Example 7 15 86 5 1.5 2.0 1.0 2.5 1.0 1.0 1.2 Inventive Example 8 16 87 4 1.0 2.5 1.0 2.5 1.0 1.0 1.1 Inventive Example 9

division Density (g / cm3) Hardness
HB (10/500) Resistivity
(μΩcm) Impact strength
(J / cm2) Trolley wire (mm / 100km) Current collector
(mm / hr) Inventive Example 1 6.62 31 25 3.5 0.003 0.025 Inventive Example 2 6.61 32 24 3.2 0.004 0.024 Comparative Example 1 6.93 41 22 5.1 0.010 0.051 Comparative Example 2 6.21 26 31 2.7 0.007 0.033 Comparative Example 3 6.59 30 24 3.1 0.006 0.031 Comparative Example 4 6.52 28 27 2.9 0.007 0.042 Comparative Example 5 6.51 30 25 3.4 0.007 0.035 Inventive Example 3 6.55 32 25 3.4 0.004 0.021 Inventive Example 4 6.61 33 26 4.2 0.003 0.019 Inventive Example 5 6.63 34 24 3.3 0.004 0.022 Inventive Example 6 6.61 30 25 3.2 0.004 0.022 Inventive Example 7 6.62 31 25 3.5 0.003 0.020 Comparative Example 6 6.93 41 22 5.1 0.007 0.046 Comparative Example 7 6.21 26 31 2.7 0.006 0.031 Inventive Example 8 6.55 32 25 3.4 0.002 0.018 Inventive Example 9 6.63 34 24 3.3 0.003 0.017

As shown in Table 1, the current collector materials of Inventive Examples 1-9, in which the composition, molding pressure, and sintering conditions of the raw powders were optimally controlled, were uniformly dispersed in the mixed powder particles compared to Comparative Examples 1-7, which were not. In addition, as shown in Table 2, it can be seen that the excellent properties in terms of the characteristics of the sintered density, hardness, resistivity, impact strength. In particular, as shown in Table 2, in the wear resistance test results of the current collector material prepared in the composition of Table 1, it can be seen that a large difference occurs in the amount of wear of the Trolley wire and the current collector material according to the material properties such as the content of the additive element Can be.

On the other hand, FIG. 1 is a cross-sectional structure photograph observed with a metal optical microscope of the sintered compact of Example 1 of the present invention, showing that the dispersion of the mixed powder particles is uniform.

In addition, Figure 2 is a picture of the assembled assembly for the wear resistance test of the current collector produced by the present invention, Figure 2 (a) has a carbon solid lubrication layer between the current collector material, Figure 2 (b) and the polymer resin It has a solid lubricating layer. In this experiment, all specimens 1 to 10 used carbon as the solid lubricant layer, and specimen numbers 12-16 indicate the case of using the polymer resin (polypropylene resin) as the solid lubricant layer.

And Figure 3 is an appearance photograph showing that the current-carrying material manufactured by the present invention by the current vehicle test success, Figure 3 (a) is the top of the assembly picture, and Figure 3 (b) shows the side of the assembly picture It is a photograph.

As described above, in the detailed description of the present invention has been described with respect to preferred embodiments of the present invention, those skilled in the art to which the present invention pertains various modifications without departing from the scope of the present invention Of course this is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the equivalents as well as the claims to be described later.

Claims (6)

In its own mass%, Cu: 82 to 87%, Sn: 4 to 8%, Cu ₃ P: 0.5 to 1.5%, graphite: 3 to 7%, Cr: 0.3 to 1.5%, MnS: 0.5 to 1.5%, coke A current collector material for sliding of a Trolley wire of an electric vehicle including: 1.0 to 2.5% and Fe to Ti: 2.0 to 3.5%.
The current collector material for sliding of the electric vehicle according to claim 1, wherein the current collector material for sliding is provided with a lubricating film layer formed by being impregnated with the machine oil which is a liquid component lubricant.
In its own mass%, Cu: 82 to 87%, Sn: 4 to 8%, Cu ₃ P: 0.5 to 1.5%, graphite: 3 to 7%, Cr: 0.3 to 1.5%, MnS: 0.5 to 1.5%, coke A process for preparing a mixed powder comprising: 1.0-2.5% and Fe-Ti: 2.0-3.5%;
Preparing a molded article having a predetermined shape using the mixed powder, and then reducing and sintering at 700 to 850 ° C under ammonia decomposition gas or hydrogen gas atmosphere; And
Impregnating the sintered compact manufactured by the said process into 1.0-2.5% of machine oil by mass% with respect to the sintered compact; Method for manufacturing a current collecting material for electric vehicle Trolley wire sliding.
In the electric vehicle sliding current collector assembly is composed of a solid lubricant is inserted between the electric vehicle Trolley wire sliding current collector,
The sliding current collector is mass%, Cu: 82 to 87%, Sn: 4 to 8%, Cu ₃ P: 0.5 to 1.5%, graphite: 3 to 7%, Cr: 0.3 to 1.5%, MnS: 0.5 ~ 1.5%, coke: 1.0-2.5% and Fe-Ti: 2.0-3.5%, and
The solid lubricant is a pure carbon material or a polymer resin electric vehicle Trolley wire current collector assembly for the sliding.
The method of claim 4, wherein when the pure carbon material is used as a solid lubricant, it is used by impregnating machine oil in the range of 3.0 to 5.5% by mass% of the sliding current collector. Reprint assembly.
The current collector assembly for sliding of the electric vehicle Trolley wire according to claim 4, wherein the polymer resin material is polypropylene or polyethylene resin.

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