Friction material of brake sheet for rail transit vehicle brake system, and preparation method and application of friction material

A technology for rail transit vehicles and braking systems is applied in the field of friction materials and preparation of brake pads of rail transit vehicles braking systems, and can solve the problems of increased wear, large fluctuations in friction coefficients, attenuation of friction coefficients of brake pads, and the like. , to achieve the effect of low wear rate, low cost and stable friction coefficient

Inactive Publication Date: 2012-07-11
MIN OF RAILWAY TRANSPORT BUREAU +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] During the braking process of a high-speed train, the kinetic energy of the train will be converted into heat energy in a short time and dissipated through the brake friction pair. This is a severe test for the performance of the brake pad material. The existing powder metallurgy copper-based friction The friction coefficient of the material fluctuates greatly under high-speed braking conditions, and the friction coefficient of the brake pads attenuates significantly under high temperature conditions, and the wear amount also increases to a certain extent

Method used

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  • Friction material of brake sheet for rail transit vehicle brake system, and preparation method and application of friction material
  • Friction material of brake sheet for rail transit vehicle brake system, and preparation method and application of friction material

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Experimental program
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Effect test

Embodiment 1

[0042] According to the weight ratio of the following components: 50 parts of Cu, 11 parts of Fe, 7 parts of Sn, 3 parts of Ni, 2 parts of Mn, 3 parts of Cr, 12 parts of C (flake graphite), 6 parts of SiC and 6 parts of Mo are mixed and prepared Mixture. A V-shaped mixer is used for mixing, and in order to avoid segregation, 20-40ml of ethanol is added to each kilogram of the mixture, and the mixing time is 2 hours. Use a powder metallurgy hydraulic press to press the mixture according to the shape of the brake pad friction block mold, the pressing pressure is 25Mpa, and the pressing time is 1min. Then put the pressed mixture into a bell furnace for sintering, the sintering pressure is 5Mpa, the sintering temperature is 880°C, the sintering time is 6h, and ammonia gas is used as the protective atmosphere.

[0043] A 1:1 braking power test bench is used to test the friction material of the above-mentioned brake pads used in the braking system of rail transit vehicles. At a spe...

Embodiment 2

[0045] According to the weight ratio of the following components: 55 parts of Cu, 8 parts of Fe, 8 parts of Sn, 4 parts of Ni, 2 parts of Mn, 4 parts of Cr, 13 parts of C (flake graphite), 3 parts of SiC and 3 parts of Mo are mixed and prepared Mixture. A V-shaped mixer is used for mixing, and in order to avoid segregation, ethanol is added, and the mixing time is 1 h. Use a powder metallurgy hydraulic press to press the mixture according to the shape of the brake pad friction block mold, the pressing pressure is 20Mpa, and the pressing time is 1min. Then put the pressed mixture into a bell furnace for sintering, the sintering pressure is 3Mpa, the sintering temperature is 860°C, the sintering time is 8h, and ammonia gas is used as the protective atmosphere.

[0046] A 1:1 braking power test bench was used to test the friction material of the above-mentioned brake pads used in the braking system of rail transit vehicles. At a speed equivalent to 350km / h, the friction coeffici...

Embodiment 3

[0048] According to the weight ratio of the following components: 53 parts of Cu, 12 parts of Fe, 8 parts of Sn, 4 parts of Ni, 2 parts of Mn, 4 parts of Cr, 10 parts of C (flake graphite), 4 parts of SiC and 5 parts of Mo are mixed and prepared Mixture. A V-shaped mixer is used for mixing, and in order to avoid segregation, ethanol is added, and the mixing time is 1.5h. Press the mixture according to the shape of the friction block mold of the brake pad, the pressing pressure is 15Mpa, and the pressing time is 1min. Then put the pressed mixture into a bell furnace for sintering, the sintering pressure is 3Mpa, the sintering temperature is 870°C, the sintering time is 10h, and ammonia gas is used as the protective atmosphere.

[0049] A 1:1 braking power test bench was used to test the above-mentioned friction material for the brake pads used in the braking system of rail transit vehicles. At a speed equivalent to 350km / h, the friction coefficient was 0.36, and the wear rate ...

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Abstract

The invention discloses a friction material of a brake sheet for a rail transit vehicle brake system, and a preparation method and application of the friction material. The friction material comprises the following components in parts by weight: 40 to 60 parts of Cu, 6 to 15 parts of Fe, 6 to 10 parts of Sn, 2 to 5 parts of Ni, 1 to 5 parts of Mn, 1 to 6 parts of Cr, 8 to 16 parts of C, 2 to 8 parts of Sic and 2 to 8 parts of Mo. The preparation method for the friction material comprises the following steps: mixing the components to obtain a mixture; placing the mixture into a die and pressing; and sintering the pressed mixture to obtain the friction material of the brake sheet for the rail transit vehicle brake system. The invention overcomes the defects in the prior art, has the advantages of stable friction coefficient and low wear rate, can safely brake rail transit vehicles, and can reduce the using cost and the maintenance cost of the rail transit vehicles.

Description

technical field [0001] The invention relates to powder metallurgy technology, in particular to a friction material for a brake pad of a rail transit vehicle braking system, a preparation method and an application. Background technique [0002] Friction material is one of the indispensable materials in brakes, clutches and friction transmissions of various mechanical equipment. It is a multi-component composite material that uses friction to convert the kinetic energy of a moving object into heat energy, thereby slowing down or stopping the object. Since the invention of the vehicle, research on friction materials has begun. In the past 20 years, with the vigorous development of the transportation industry, the development of friction materials has been particularly rapid. Many new friction materials have emerged and are widely used in various construction machinery and transportation tools. The trend of scientific and technological development in the 21st century is high sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C30/04C22C1/05F16D69/02
Inventor 焦标强李和平李继山丁福焰陈德峰吕宝佳顾磊磊
Owner MIN OF RAILWAY TRANSPORT BUREAU
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