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Motor train unit brake pad and fabrication method thereof

A technology for brake pads and EMUs, applied to friction linings, mechanical equipment, etc., can solve the problem of multiple scratches and furrows on the surface of brake discs, failure to meet the requirements for limiting element content, and large wear on the surface of brake discs and other problems, to achieve the effect of small friction coefficient fluctuation, stable friction performance and low wear

Active Publication Date: 2021-07-13
上海连纵轨道交通科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above formula is mainly copper, contains eutectoid steel grinding powder, and the friction component is mainly silicon dioxide; although the brake pads prepared with this formula have the characteristics of high friction coefficient and low wear under high-speed braking conditions, However, due to the high content of hard particle silica, the brake pads have a greater wear on the surface of the brake disc, and with the passage of service time, more scratches, furrows, etc. will occur on the surface of the brake disc. damage
Moreover, the silicon dioxide content in the above formula is as high as 4-6 parts by weight, which cannot meet the requirements on the content of restricted elements in the standard TJ / CL307-2019 "Temporary Technical Conditions for Brake Plates of EMUs"
In addition, the friction coefficient of the brake pads of the above formula is as high as 0.411-0.449 when braking at 200km / h and 250km / h respectively, which has exceeded the friction coefficient required by the standard TJ / CL307-2019 "Temporary Technical Conditions for EMU Brake Pads"

Method used

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  • Motor train unit brake pad and fabrication method thereof
  • Motor train unit brake pad and fabrication method thereof
  • Motor train unit brake pad and fabrication method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The present embodiment EMU brake pad comprises the following raw material components:

[0031] Copper powder: 35 parts by weight, nano copper wire: 25 parts by weight, iron powder: 13 parts by weight, ferrochrome powder: 10 parts by weight, zircon sand: 10 parts by weight, ferromolybdenum powder: 5 parts by weight; barite powder: 3 Parts by weight; molybdenum disulfide powder: 3 parts by weight; natural granular graphite: 5 parts by weight, natural flake graphite: 8 parts by weight; titanium carbide powder: 3.5 parts by weight; zinc powder: 2 parts by weight.

[0032] The copper powder is electrolytic copper powder with a particle size of 45-75 μm.

[0033] The iron powder is reduced iron powder with a purity of ≥98% and a particle size of 45-75 μm.

[0034] The ferrochrome powder is a medium-carbon ferrochrome powder, wherein the chromium content is 60%, the carbon content is 1%, and the particle size is 45-75 μm.

[0035] The particle size of the molybdenum disulfid...

Embodiment 2

[0044] The present embodiment EMU brake pad comprises the following raw material components:

[0045] Copper powder: 45 parts by weight, nano copper wire: 10 parts by weight, iron powder: 10 parts by weight, ferrochrome powder: 12 parts by weight, zirconium sand: 3 parts by weight, ferromolybdenum powder: 1 part by weight; barite powder: 5 parts by weight Parts by weight; molybdenum disulfide powder: 0.5 parts by weight; natural granular graphite: 15 parts by weight, natural flake graphite: 1 part by weight; titanium carbide powder: 5 parts by weight; zinc powder: 1 part by weight.

[0046] The copper powder is reduced copper powder with a particle size of 45-75 μm.

[0047] The iron powder is reduced iron powder with a purity of ≥98% and a particle size of 45-75 μm.

[0048] The ferrochrome powder is a high-carbon ferrochrome powder, wherein the chromium content is 72%, the carbon content is 6%, and the particle size is 45-75 μm.

[0049] The particle size of the molybdenum...

Embodiment 3

[0058] The present embodiment EMU brake pad comprises the following raw material components:

[0059] Copper powder: 40 parts by weight, nano copper wire: 18 parts by weight, iron powder: 6 parts by weight, ferrochrome powder: 15 parts by weight, zircon sand: 6.5 parts by weight, ferromolybdenum powder: 3 parts by weight; barite powder: 7 parts by weight Parts by weight; molybdenum disulfide powder: 2.5 parts by weight; natural granular graphite: 10 parts by weight, natural flake graphite: 4.5 parts by weight; titanium carbide powder: 2 parts by weight; zinc powder: 3 parts by weight.

[0060] The copper powder is water atomized copper powder with a particle size of 45-75 μm.

[0061] The iron powder is reduced iron powder with a purity of ≥98% and a particle size of 45-75 μm.

[0062] The ferrochrome powder is high-carbon ferrochrome powder, wherein the chromium content is 65%, the carbon content is 10%, and the particle size is 45-75 μm.

[0063] The particle size of the m...

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Abstract

The invention provides a motor train unit brake pad and a fabrication method thereof, and belongs to the technical field of brake pad manufacturing. The raw material formula of the brake pad comprises the following components: copper powder, nano copper wires, iron powder, ferrochromium powder, zircon sand, ferromolybdenum powder, barite powder, molybdenum disulfide powder, natural granular graphite, natural flaky graphite, titanium carbide powder and zinc powder. All the raw material components are fully mixed and then subjected to compression molding, and an obtained blank is subjected to hot pressing sintering and isothermal cooling to obtain the brake pad. The brake pad is good in friction coefficient stability and low in material wear rate, the material has good heat-conducting property, the adhesion of a friction material to a brake disc in the braking process can be effectively reduced, and the damage to the brake disc is small.

Description

technical field [0001] The invention relates to the manufacturing technology of brake pads, in particular to a brake pad for an EMU and a preparation method thereof, and belongs to the technical field of high-speed train brake equipment manufacturing and production. Background technique [0002] At present, copper-based powder metallurgy brake pads are widely used in EMU train brake pads. With the rapid development of China's EMU trains, the braking speed is gradually increasing, and the braking load is increasing; the working temperature and stress on the surface of copper-based powder metallurgy brake pads are gradually increasing. According to the requirements of the "Special Test Outline for EMU New Brake Application Assessment Emergency Braking", when a train running at a speed of 250km / h brakes in an emergency, the friction braking system must be able to stop the train within a braking distance of 3200m. Huge kinetic energy will be consumed during the braking process,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C49/02C22C49/14C22C47/14F16D69/02
CPCC22C49/02C22C49/14C22C47/14F16D69/028
Inventor 罗明良
Owner 上海连纵轨道交通科技有限公司