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Brake block for high-speed train and preparation method thereof

A technology for high-speed trains and brake pads, which is applied in the field of metal matrix composite brake pads and its preparation, can solve the problems of shortened service life, increased wear, and elevated friction temperature, achieving long service life, low wear rate, and thermal shock resistance good performance

Active Publication Date: 2009-11-04
BOSUN TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theoretical research and actual vehicle operation conditions show that the existing conventional braking materials, such as semi-metal-based composite materials, cannot meet the requirements of friction coefficient, train running stability, wear resistance, thermal conductivity, and braking distance. The needs of speed-up vehicles, during the braking process of the train running at a speed greater than 200Km / h, due to frictional braking, the kinetic energy of the train is almost completely converted into frictional heat, which makes the temperature rise of the friction pair very high, resulting in the traditional semi-metal-based synthetic brake. The friction coefficient of the pads is unstable, the brake pads are aging, cracked, worn and shortened, and the service life is shortened, which cannot meet the braking needs of high-speed trains

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: 40 kg of copper, 10 kg of nickel, 6 kg of iron, 1.5 kg of manganese, 3 kg of chromium, 12 kg of graphite, 6 kg of silicon carbide, 4 kg of tungsten, 4 kg of titanium dioxide, 5 kg of silicon dioxide, 2 kg of titanium kg, 1.5 kg of aluminum, the purity of the above-mentioned powder raw materials is industrially pure, and the particle size is all finer than 200 mesh. Put the brake block powder raw material weighed according to the above ratio into a three-dimensional mixer, mix it for 40 minutes, and mix it well; put the mixed powder raw material into a mold and put it into a sintering furnace for sintering and hot pressing. The sintering temperature is 860°C, the pressure is 16Mpa, and the sintering time is 25 minutes to make a block; the hot-pressed block is processed into shape, and then the block is welded on the steel back, the steel back and the dovetail plate are welded, and the surface is treated Afterwards, the finished brake pad is obtained.

Embodiment 2

[0015] Example 2: 35 kg of copper, 12 kg of nickel, 5 kg of iron, 2 kg of manganese, 2 kg of chromium, 8 kg of graphite, 7 kg of silicon carbide, 5 kg of tungsten, 5 kg of titanium dioxide, 6 kg of silicon dioxide, 1 kg of titanium kg, 1 kg of aluminum, the purity of the powder raw materials is industrially pure, and the particle size is 200 mesh or finer. Put the brake block powder raw material weighed according to the above ratio into a three-dimensional mixer, mix it for 40 minutes, and mix it well; put the mixed powder raw material into a mold and put it into a sintering furnace for sintering and hot pressing. The sintering temperature is 87°C, the pressure is 12Mpa, and the sintering time is 30 minutes to make a block; the hot-pressed block is processed into shape, and then the block is welded on the steel back, the steel back and the dovetail plate are welded, and the surface is treated. Afterwards, the finished brake pad is obtained.

Embodiment 3

[0016] Embodiment 3: 50 kilograms of copper, 8 kilograms of nickel, 8 kilograms of iron, 1 kilogram of manganese, 4 kilograms of chromium, 14 kilograms of graphite, 5 kilograms of silicon carbide, 3 kilograms of tungsten, 3 kilograms of titanium dioxide, 4 kilograms of silicon dioxide, titanium 3 kilograms kg, 2 kg of aluminum, the purity of the powder raw materials is industrial pure, and the particle size is 200 mesh or finer. Put the brake block powder raw material weighed according to the above ratio into a three-dimensional mixer, mix it for 40 minutes, and mix it well; put the mixed powder raw material into a mold and put it into a sintering furnace for sintering and hot pressing. The sintering temperature is 900°C, the pressure is 15Mpa, and the sintering time is 15 minutes to make a block; the hot-pressed block is processed into shape, and then the block is welded on the steel back, the steel back and the dovetail plate are welded, and the surface is treated. Afterward...

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Abstract

The invention provides a brake block for a high-speed train and a preparation method thereof, which belongs to the technical field of powdery metallurgical materials and is used for solving the problem of unstable friction factor of a semimetal-based composite brake block. The improved brake block is made from the following powdery raw materials according to parts by weight: 25 to 55 parts of copper powder, 5 to 20 parts of nickel powder, 4 to 12 parts of iron powder, 1 to 4 parts of manganese powder, 1 to 9 parts of chromium powder, 5 to 20 parts of graphite, 5 to 10 parts of carborundum, 1 to 8 parts of tungsten powder, 3 to 6 parts of titanium pigment, 3 to 10 parts of silicon dioxide, 1 to 4 parts of titanium powder, and 1 to 5 parts of aluminum powder. The raw materials are technically pure, and the grain size is 200 meshes or less. The brake block is made from metal-based composite raw materials, the raw material of the substrate is copper alloy with high thermal conductivity and good plasticity. With the reasonable adoption of other materials and optimized proportioning thereof, the made brake block has the following characteristics: 1. base body with good thermal shock resistance and no crazing, 2. stable change of friction factors under the condition of friction temperature rise, and 3. low attrition rate and long service life.

Description

technical field [0001] The invention relates to a metal-based composite material brake pad for high-speed trains and a preparation method thereof, belonging to the technical field of powder metallurgy materials. Background technique [0002] With the rapid development of the national economy, the requirements for the convenience and comfort of transportation are also increasing. High-speed trains have become an inevitable trend in the development of train transportation, and the relative safety issues have attracted more and more attention. Research shows that every time the train speed is doubled, its braking power will increase by 8 times. Therefore, quite strict technical requirements are put forward for the braking materials used in speed-up vehicles. Theoretical research and actual vehicle operation conditions show that the existing conventional braking materials, such as semi-metal-based composite materials, cannot meet the requirements of friction coefficient, train ...

Claims

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Application Information

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IPC IPC(8): F16D69/02B22F1/00B22F3/14
Inventor 孟凡爱王焕成裴龙刚
Owner BOSUN TOOLS CO LTD
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