KR890000848B1 - Making method of pantagraph collector's friction plate - Google Patents

Abstract

The making process of a pantagraph collector's friction plate comprises the making of a porous article by pressing and sintering a metal powder with addition of an air-hole making agent, and a impregnation of a conductive mechanical oil into the above air hole. A metal powder is composed of 86-95 wt.% Cu, 3-7 wt.% Sn, and 2-10 wt.% graphite.

Description

Manufacturing Method of Electric Vehicle Pantograph Friction Plate

The present invention relates to a method for producing a friction plate of an electric vehicle pantograph (pantograph), which maximizes the carrying capacity and at the same time improves wear resistance and arc resistance.

Conventionally, it was made by impregnating machine oil in copper, tin, graphite and other small alloys, but due to the non-conductive nature of machine oil, the conductivity is poor, and arc and abrasion are severely generated. There was no.

The present invention, in order to improve the closed end of the conventional current collector friction plate such as mixing copper, tin, and graphite in a predetermined ratio and adding a pore generator to the sintering of the porous matrix after the conductive machine oil with excellent conductivity It is to be manufactured by impregnating to maintain the lubricity of the current collector friction plate as it is to maximize the current carrying capacity and to improve the arc resistance and wear resistance to be able to use more long-term.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The present invention is homogeneously mixed after adding a pore generator to generate pores in the powder composition of copper: 86-95wt% (150-300mesh powder), tin: 3-7wt%, and graphite: 2-10wt% It is a method of manufacturing a motor vehicle pantograph friction plate by compressing, molding and sintering to prepare a mother body and impregnating conductive pores in the pores of the mother body. In general, a current collector plate such as a pantograph should have good electrical conductivity and smooth lubrication so as to have arc resistance and wear resistance without scraping the trolley wire.

When the copper content is less than 86wt% (hereinafter referred to as%), the conductivity decreases and the contact resistance increases, and when the copper content exceeds 95%, the lubrication action is significantly reduced, resulting in defects such as copper drag and increased frictional resistance. The copper content is preferably 86-95%, as it causes a large failure.

If the content of tin is less than 3%, the increase factor of mechanical properties due to copper-tin alloy is small, and the life is shortened. If the content is more than 7%, the mechanical strength increases, but the melting point is lowered and the conductivity is significantly reduced. Silver is 3-7%. Since graphite has melting point over 3000 ℃, it is arc-resistant and self-lubricating. If it is less than 2%, wear due to frictional resistance is severe, and if it is more than 10%, the contact effect due to increase of contact resistance is reduced. 2-10% is preferred.

Meanwhile, zinc stearic acid (Zincstearate) is used as the pore generator, which has a small specific gravity as a pore generator to form a large volume as a small amount and act as a lubricant to reduce friction with the mold inner wall during molding.

The zinc stearic acid matrix is added to have a predetermined porosity, preferably 3-15%, and when added in a small amount, the zinc stearic acid matrix loses its role as a molding lubricant and contributes too little to the occurrence of processing. Since there is a possibility of occurrence, 0.3-3wt% is preferred.

The pore generators suitable for the present invention are not limited to the zinc stearic acid, and pore generators of different kinds may be used depending on the properties such as pore generation and molding lubrication.

In addition, the conductive machine oil preferably has a trade name of L-7, and has physical properties as shown in Table 1 below.

TABLE 1

The L-7 has good electrical conductivity due to low electrical resistance, can be used for metals and non-metals, and can be lubricated for a long time because the operating temperature range is wide and undry, and the present invention is not limited thereto. Other machine oils may be selected.

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

EXAMPLE

In the powder composition having the component ratio of Table 2, zinc stearic acid was completely mixed and molded to obtain the porosity of Table 2, and then sintered at 800 ° C. for 2 hours. For the friction plate, the amount of wear was measured under the conditions of abrasion test conditions of contact pressure: 10 kg / cm ² , current: 150 A, and speed: 445 m / min. Using this, the specific resistance, tensile strength, impact value and hardness were measured and the results are shown in Table 3 below.

TABLE 2

TABLE 3

As shown in Table 3, it can be seen that the present invention has superior mechanical and electrical properties as compared to the conventional method.

As described above, the present invention is capable of maximizing the amount of energization while maintaining the lubricity, and has a remarkable effect of providing an electric vehicle pantograph friction plate excellent in arc resistance and wear resistance.

Claims (1)

In a method of manufacturing a motor vehicle pantograph friction plate by adding a pore generator to a powder composition of copper, tin and graphite to form a matrix containing pores by homogeneous mixing, molding, and sintering, and impregnating conductive pores in the pores in the matrix. , The powder composition is copper: 86-95wt%, tin: 3-7wt%, and graphite: 2-10wt% of the manufacturing method of the electric car pantograph friction plate.