High-speed train brake disc and preparation method thereof

A technology for high-speed trains and brake discs, applied in the direction of brake discs, etc., can solve the problems of wear, high surface temperature of friction pairs, rim cracks, etc., and achieve the effect of reducing wear and improving thermal crack resistance.

Pending Publication Date: 2022-04-12
JIANGSU DINGTAI ENG MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the surface temperature of the friction pair is very high during high-speed braking, which will cause the deformation of the disc body
Existing brake discs of high-speed trains will have problems such as serious wear and rim cracks during service, which directly affect the braking performance and safety performance of the train
At the same time, the brake discs of high-speed trains mainly rely on imports, which has seriously restricted the improvement of the quality and efficiency of railway locomotive maintenance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment provides a high-speed train brake disc material preparation steps:

[0032] 1) Melting and purification of cast steel brake disc materials Cast steel brake disc materials for high-speed trains are prepared by remelting and vacuum smelting. The temperature is 1500°C-2000°C, and the vacuum degree reaches above 10Pa. When the molten steel reaches 1760±30°C, samples are taken to detect the chemical composition of the molten steel. After the composition is qualified, the steel is deoxidized by inserting aluminum.

[0033] 2) The Re-Ti-Si creep quality agent is poured into the ladle by the method of flushing into the ladle when tapping, the purpose is to degas, desulfurize and suck out other harmful impurities, and it can also improve the shape and distribution of inclusions, improve As-cast structure of steel, thereby improving the quality of steel.

[0034] 3) Adopt the argon blowing purification process in the ladle to reduce the inclusions and gas content...

Embodiment 2

[0039] The high-speed train brake disc material of the present embodiment, each component that it comprises and mass percentage thereof are:

[0040]Carbon content 0.2%, silicon content 0.6%, manganese content 0.4%, tungsten content 0.01%, vanadium content 0.2%, molybdenum content 0.3%, nickel content 1.0%, chromium content 1.0%, titanium content 0.01%, aluminum content 0.02%, Copper 0.1%, zirconium content 0.035%, boron 0.001%, cobalt 0.1%, phosphorus, sulfur content is less than or equal to 0.01%; iron balance.

[0041] After testing, the tensile strength of the brake disc at room temperature: 1210MPa, the yield strength of the brake disc: 1050MPa, the Brinell hardness: 342HB, the friction coefficient is stable at 0.35-0.40, and the impact toughness of the brake disc at room temperature: 40J.

Embodiment 3

[0043] The high-speed train brake disc material of the present embodiment, each component that it comprises and mass percentage thereof are:

[0044] Carbon content 0.28%, silicon content 0.7%, manganese content 0.75%, tungsten content 0.01%, vanadium content 0.2%, molybdenum content 0.3%, nickel content 1.0%, chromium content 1.0%, titanium content 0.01%, aluminum content 0.032%, Copper 0.2%, zirconium content 0.035%, boron 0.003%, cobalt 0.2%, phosphorus and sulfur content is less than or equal to 0.01%; iron balance.

[0045] After testing, the tensile strength of the brake disc at room temperature: 1210MPa, the yield strength of the brake disc: 1050MPa, the Brinell hardness: 365HB, the friction coefficient is stable at 0.38-0.40, and the impact toughness of the brake disc at room temperature: 40J.

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Abstract

A cast steel disc body of the high-speed train brake disc comprises, by mass, 0.2%-0.32% of carbon, 0.5%-0.7% of silicon, 0.4%-0.8% of manganese, 0.01%-0.02% of tungsten, 0.1%-0.9% of vanadium, 0.7%-0.9% of molybdenum, 1.0%-1.5% of nickel, 0.9%-1.2% of chromium, 0.01%-0.02% of titanium, 0.020%-0.035% of aluminum, 0.1%-0.3% of copper, 0.035%-0.050% of zirconium, 0.001%-0.003% of boron, 0.1%-0.2% of cobalt, the sum of the content of phosphorus and the content of sulfur is smaller than or equal to 0.01%, and the balance iron. The cast steel disc body of the high-speed train brake disc is prepared through a remelting method, vacuum melting and aluminum insertion deoxidation tapping, a Re-Ti-Si creep modifier is poured into a steel ladle through an in-ladle pouring method, and impurities are removed through an in-ladle argon blowing purification process, so that the high-speed train brake disc has enough strength and a high and stable friction coefficient, and the service life of the high-speed train brake disc is prolonged. The wear resistance is higher; and the thermal crack resistance is better.

Description

technical field [0001] The invention relates to a high-speed train brake disc and a preparation method thereof. Background technique [0002] Under the braking conditions of high-speed trains and harsh operating conditions, the huge thermal load and thermal shock of the brakes cause a high temperature gradient, which leads to high thermal stress, which leads to stress concentration, cracks and expand. At the same time, the surface temperature of the friction pair is very high during high-speed braking, which will cause the deformation of the disc body. Existing brake discs of high-speed trains will have problems such as serious wear and rim cracks during service, which directly affect the braking performance and safety performance of the train. At the same time, the brake discs of high-speed trains mainly rely on imports. This situation has seriously restricted the improvement of the quality of railway locomotive maintenance and service efficiency. Contents of the invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/50C22C38/42C22C38/54C22C38/52C21C7/00C21C7/06C21C7/072C21D1/28C21D1/18F16D65/12
Inventor 陈赞
Owner JIANGSU DINGTAI ENG MATERIAL
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