KR20060124056A - A friction plate in pantograph for electric rail car and its manufacturing mathod - Google Patents

Abstract

A friction plate in a pantograph for an electric rail car and a method for manufacturing the same are provided to improve life in comparison with a conventional product and effectively replace an existing friction plate. In a friction plate, an additive of 0.1 to 6% is contained, wherein the additive is composed of more than one item, selected among a Cu : 80 to 92%, an Sn : 3 to 8%, a black lead : 1 to 6%, and a Fe; a ferro alloy consisting of more than one item among a Fe-Mo, a Fe-Ti, and a Fe-Cr; a CR; and a Cu3P. And, a particle size of the Fe, the ferro alloy, and the Cr is from 45 to 500um.

Description

A friction plate in pantograph for electric rail car and its manufacturing mathod

The present invention relates to a current collector friction plate capable of improving the life of the main wet plate having heat resistance, rain resistance, lubricity, wear resistance and arc resistance, and a method of manufacturing the same.

In general, a pantograph of an electric vehicle is installed on a roof of a tram or an electric locomotive and collects electricity while contacting a trolly wire, and a current collector friction plate is provided at a portion continuously contacting the tramline. Since the pantograph collector friction plate is in contact with the electric vehicle lines, it acts at the same time as it slides and collects electricity. Therefore, good conductivity and sufficient electric current collection capacity are required, and the abrasion of the current collector plate and the electric vehicle lines is small, and resistance to electrical wear such as arc resistance is required. It is required to be.

Therefore, the invention described in the Republic of Korea Patent No. 2000-31027 as the prior art for this. The present publication discloses a composition for a current collector friction plate comprising 82 to 88% by weight of copper, 8 to 12% by weight of tin, and 0.5 to 3% by weight of graphite, which contains 4 to 7% by weight of wear-resistant light metal. have.

However, the invention described in the above publication was difficult to expect abrasion resistance above a certain limit due to the problem of the ratio of the main material and the additive content of the pantograph collector friction plate. In particular, the wear resistance to moisture in the external environment, that is, during the rainy season, is significantly reduced, and thus it cannot be used for a long time. In addition, the tin content of 8 to 12% by weight is alloyed with copper, thereby increasing mechanical properties such as hardness, thereby directly affecting the wear of the corresponding material, which is a relative material.

Accordingly, the present invention has been made to solve the above problems of the prior art, by optimizing the main material, additive content ratio and type, such as the current collector friction plate current collector friction plate having excellent heat resistance, wear resistance, lubricity, rain resistance and a manufacturing method The purpose is to provide.

The present invention for achieving the above object,

By weight: Cu: 80-92%, Sn: 3-8%, graphite: 1-6%, and Fe; Ferro alloys composed of at least one selected from Fe-Mo, Fe-Ti, and Fe-Cr; Cr; And an additive composed of at least one selected from Cu ₃ P: 0.1 to 6%, wherein the Fe, ferro alloy, and Cr are related to a current collector friction plate, characterized in that the particle size is 45 to 500 μm.

In addition, the present invention,

By weight: Cu: 80-92%, Sn: 3-8%, graphite: 1-6%, and Fe; Ferro alloys composed of at least one selected from Fe-Mo, Fe-Ti, and Fe-Cr; Cr; And an additive powder composed of at least one selected from Cu ₃ P: a raw material mixed powder comprising 0.1 to 6%;

Sintering at 650 to 900 ° C. after press molding the mixed powder; And

And impregnating machine oil into the sintered body prepared from the above. Fe, ferro alloy and Cr of the additives are related to the current collector friction plate manufacturing method, characterized in that the particle size of 45 ~ 500㎛.

Hereinafter, the composition for current collector friction plates of the present invention will be described.

First, the current collector friction plate of the present invention includes Cu, specifically, the content of Cu is preferably limited to 80 to 92% by weight. If the copper content is less than 80% by weight, the contact resistance is increased, the current collector capacity is lowered, the mechanical properties are lowered, the wear of the friction plate is increased, and if the content is more than 92% by weight (hereinafter referred to as "%"), the lubricity This is because the abrasion of the tramline due to lack can cause a big problem.

Sn is a base component alloying with Cu, and in the present invention, Sn is preferably limited to 3 to 8%. If the content is less than 3%, the sintering capacity of copper is lowered and the mechanical properties are not improved, and the life of the friction plate is shortened. In addition, if the content is more than 8%, the electrical wear including arc consumption and melting damage due to the increase in the specific resistance is bad, and the mechanical properties greatly improved by alloying may wear out the tank material, the relative material.

Graphite is a lubricating component that serves to reduce wear by interfering with the chariot lanes and the friction plate to reduce metal contact, and the content of the graphite is preferably limited to 1 to 6%. If the content is more than 6%, the wear of the chariot is less, but the friction plate is not appropriate because the wear is increased mechanically and electrically, and less than 1% is not preferable because the chariot may increase the wear of the chariot.

The friction plate of the present invention may also include at least one of Fe, Ferro alloy and Cr as an additive. And the ferro alloy may be used at least one selected from Fe-Mo, Fe-Ti and Fe-Cr.

The Fe, Ferro alloy (Fe-Mo, Fe-Ti, Fe-Cr) and chromium are abrasion-resistant components to uniformly disperse the hard particles in the possession, mainly due to the pumice effect (plastic deformation caused by frictional force due to sliding) To prevent wear). Therefore, it is preferable to minimize the reaction of the powders during sintering, and in the present invention, it is preferable to control the size of the additive powder to 45 ~ 500㎛ for the pumice effect. If the size is less than 45㎛, the particles easily fall off during sliding friction and cannot play a role as a wear-resistant material.If the size exceeds 500㎛, it is difficult to uniformly mix, which results in local wear caused by segregation and tank wire wear. Can cause.

In the present invention, it is preferable to limit the content of the additive composition as described above to 0.1 ~ 6%. If the additive content is less than 0.1%, segregation may cause uneven wear of the friction plate, and if it exceeds 6%, the electrical wear characteristics may be deteriorated.

By optimizing the composition of the additives as described above, it is possible to minimize the influence of the electric lane, which is a relative material, to improve wear resistance and corrosion resistance of the current collector friction plate, and in particular, to ensure durability that can be used for a long time during the rainy season.

On the other hand, in the present invention, it is more preferable to add Cu ₃ P as an additive within the additive component content range. Cu-P (Cu ₃ P) is a powder added in order to improve mechanical properties, such as Sn, it is necessary to add in the form of Cu ₃ P alloy powder, because segregation is feared when added to P alone. However, the particle size of the Cu ₃ P powder added additionally is preferably limited to 1 ~ 200㎛ or less. If the size is less than 1 μm, it is difficult to achieve uniform mixing due to segregation due to reaggregation. If the size is more than 200 μm, uniform alloying with Cu may be difficult during sintering, which may cause local wear of the current collector friction plate.

Next, the current collecting friction plate manufacturing process of the present invention will be described.

First, in the present invention, after preparing the mixed powder prepared as described above, it is press-molded and sintered. The mixed powder is press-molded under the usual conditions, and more preferably, is molded at a pressure of 1.5 to 4 ton / cm ² .

As such, the mixed powder is press-molded and then sintered. In the present invention, the sintering temperature range is preferably limited to 650 to 900 ° C. In other words, it is advantageous to sinter in the temperature range from 650 ℃ to sintering after molding to 900 ℃ to minimize the copper drag phenomenon due to over sintering.

Subsequently, in the present invention, the pores of the sintered body thus obtained are impregnated with a machine oil using a vacuum impregnator to compensate for lubricity, thereby obtaining a current collector friction plate having excellent wear resistance.

By optimizing the main material, additive content ratio and type as described above to improve the lubricity, wear resistance and corrosion resistance to ensure the durability that can be used for a long time in the dry season as well as during the rainy season.

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

Example 1

Table 1

division Component (wt%) Cu Sn C Cr Fe Fe-Ti Fe-Cr Fe-mo Cu ₃ P Comparative Example 1 83 10 2 5 Inventive Example 1 88 5 3 4 Inventive Example 2 85.5 7 3.5 4 Inventive Example 3 88 7 2 3 Inventive Example 4 87 6 3 4 Inventive Example 5 83 8 3.5 5.5 Inventive Example 6 85.9 6 2.5 4.5 1.1 Inventive Example 7 85 6 3 4 2

After preparing a mixed powder having a component ratio as shown in Table 1, it was molded at a pressure of 2.5ton / cm ² , at this time, Fe, ferro alloy and chromium powder particle size forming an additive was controlled to 150㎛. Subsequently, the molded bodies were sintered for 1 hour under an ammonia gas atmosphere at a temperature of 750 ° C., and then a current collecting plate was prepared by impregnating oil into pores of the mother body.

The mechanical properties of the current collector friction plate manufactured using Brinell hardness tester, resistance measuring instrument, tensile strength tester, Charpy impact tester, etc. are shown in Table 2 below. Table 3 shows the change in the wear amount of the wire). On the other hand, the wear resistance characteristics of Table 3 are the results measured under the conditions of driving speed 80km / hr, 500A applied current, 5kgf pressure.

[Table 2]

division Density (g / cm 3) Hardness HB (10/500) Electrical resistivity (μΩ ・ ㎝) Tensile Strength (kgf / ㎠) Impact Strength (J / ㎠) Comparative Example 1 7.55 55 25 1710 122 Inventive Example 1 6.67 35 18 1290 98 Inventive Example 2 6.83 36 23 1300 102 Inventive Example 3 6.91 38 21 1250 103 Inventive Example 4 6.84 37 25 1350 107 Inventive Example 5 7.02 37 14 1580 145 Inventive Example 6 7.13 41 25 1480 125 Inventive Example 7 7.27 39 28 1540 135

Table 3

division Friction plate (g) Head (mm) division Friction plate (g) Catenary (mm) Comparative Example 1 12.8 0.025 Inventive Example 1 7.5 0.016 Inventive Example 2 7.9 0.009 Inventive Example 3 7.6 0.009 Inventive Example 4 8.0 0.020 Inventive Example 5 8.5 0.015 Inventive Example 6 6.3 0.010 Inventive Example 7 6.7 0.013

As shown in Table 2 and Table 3, in the case of the product of the present invention (1-7) has a lower physical characteristics than the conventional product, in terms of its durability, the product of the present invention is about 40 to 100% or more than the conventional product Its durability is improved, and it is understood that the amount of wear of the front line is similar or small.

In particular, it can be seen that Inventive Example (6-7) using Cu ₃ P as an additive has better durability than in the case of Inventive Example (1-5).

Example 2

After preparing a mixed powder having the same composition as inventive example (1) of Table 1, using the same conditions as in Example (1) to prepare a current collector friction plate. However, at this time, the particle size of the additive powder constituting the mixed powder was different from Table 4 below.

The mechanical properties of the current collector friction plate manufactured using Brinell hardness tester, resistance measuring instrument, tensile strength tester, Charpy impact tester and the like are shown in Table 4 below. The amount of wear of wire) is also shown in Table 4.

TABLE 4

division Additive powder particle size Density (g / cm 3) Hardness HB (10/500) Electrical resistivity (μΩ ・ ㎝) Tensile Strength (kgf / ㎠) Impact Strength (J / ㎠) Wear resistance Friction plate (g) Tank line (mm) Comparative Example 2 10 μm 6.59 35 21 1380 103 11.3 0.015 Inventive Example 8 100 μm 6.70 35 22 1351 95 7.8 0.013 Inventive Example 9 300㎛ 6.77 36 22 1318 94 7.0 0.019

As shown in Table 4, in the case of the product of the present invention Example (8-9) has the wear resistance as a role of the additive pumice effect, the effect in terms of durability appears, but in the case of the product of Comparative Example (2) It can be seen that there is no difference from Example (1).

As described above, the current collector friction plate manufactured by the manufacturing method of the present invention is capable of manufacturing a current collector friction plate for an electric railway having a much improved life compared with the existing product, and can effectively replace the existing current collector friction plate.

Claims (2)

By weight: Cu: 80-92%, Sn: 3-8%, graphite: 1-6%, and Fe; Ferro alloys composed of at least one selected from Fe-Mo, Fe-Ti, and Fe-Cr; Cr; And an additive composed of at least one selected from Cu ₃ P: 0.1 to 6%, wherein the Fe, ferro alloy and Cr have a particle size of 45 to 500 μm. By weight: Cu: 80-92%, Sn: 3-8%, graphite: 1-6%, and Fe; Ferro alloys composed of at least one selected from Fe-Mo, Fe-Ti, and Fe-Cr; Cr; And an additive powder composed of at least one selected from Cu ₃ P: a raw material mixed powder comprising 0.1 to 6%; Sintering at 650 to 900 ° C. after press molding the mixed powder; And Impregnating mechanical oil into the sintered body prepared from the above; wherein, among the additives, Fe, ferro alloy and Cr, the particle size of the current collector friction plate manufacturing method characterized in that