Freight car compartment powder metallurgy brake block

Abstract

The invention relates to a powder metallurgy brake shoe for a freight car, which is composed of a tile back (4) and a brake block (3). The tile back material is QT400-18, which is formed by one-time casting. The brake block and the tile back adopt a welding or riveting connection structure , the powder metallurgy friction block (6) on the brake block (3) adopts powder metallurgy friction material: take iron as the matrix, add lead, graphite, molybdenum disulfide, copper, aluminum oxide, etc. , Pressurized sintering. The invention has the characteristics of reliable structure, stable braking friction performance, low surface temperature rise, small dispersion, good wear resistance, etc., and can be applied to the braking of railway freight cars with a speed of 160 km / h and below.

Description

technical field [0001] The invention relates to a brake shoe for a railway vehicle, in particular to a powder metallurgy brake shoe for a carriage of a freight car. Background technique [0002] With the continuous development of the railway science and technology industry, the operating speed of railway trains is constantly increasing, and railway freight cars are developing in the direction of speed-up and heavy load. Therefore, the requirements for braking performance of brake shoes are also getting higher and higher. Not only brake shoes are required to have good Braking performance, and it is required that the brake shoes do not cause abnormal wear and damage to the wheel tread, no material transfer during braking, no harmful substances, and no pollution to the environment. At present, the braking materials of railway freight cars are mostly high-phosphorus cast iron tiles and synthetic brake shoes. During the operation of the train after the speed is increased, its def...

AI Technical Summary

Problems solved by technology

At present, the braking materials of railway freight cars are mostly high-phosphorus cast iron tiles and synthetic brake shoes. During the operation of the train after the speed is increased, its defects are gradually exposed. The friction coefficient decreases, resulting in longer braking distance. Because the cast iron tile has a large specific gravity and hardness and directly brakes on the train wheel, it is easy to cause damage to the wheel tread; and the synthetic brake shoe is easy to cause friction on the wheel tread due to poor heat dissipation. damage or even surface peeling, the metallographic structure of the wheel changes

At the same time, the friction coefficient of the above two brake shoes is also very unstable in rainy and snowy weather conditions, and the friction coefficient decreases sharply during braking, which leads to a significant extension of the braking distance

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