Composition brake shoe for railway freight car, and method for manufacturing same

Abstract

The invention discloses a composition brake shoe for a railway freight car, and a method for manufacturing the same. A friction piece of the composition brake shoe for the railway freight car is synthetised by using following materials by weight parts: 6-10 parts of nitrile rubber, 2-8 parts of modified phenolic resin, 3-6 parts of steel wool fibers, 9-16 parts of sepiolite fibers, 2-16 parts of composite mineral fibers, 5-13 parts of graphite, 0.4-2 parts of calcined bauxite, 20-24 parts of barium sulfate, 8-12 parts of potassium feldspar powder, 10-20 parts of iron powder, and 1-3 parts of additives. The friction piece of the composition brake shoe is formed through the steps of dosing, banburying or mixing, crashing, hot press molding and curing forming, and thermal processing. The composition brake shoe is capable of well satisfying various performance indexes requested in PRC (People's Republic of China) railway industrial standard TB / T2403-2010, and can be applied to railway freight cars traveling at the highest speed of 120km / h and axle load of the composition brake shoe is not greater than 25 tons; besides, the composition brake shoe has stable friction properties and excellent friction resistance, and is low in attrition to wheels and low in braking noise; and as a result, potential quality hazards ( such as brake shoe body breakage, slag and block dropping, metal inlaying and hot cracks) endangering traveling safety are fundamentally solved.

Description

technical field [0001] The invention relates to a high-friction-coefficient synthetic brake shoe for railway freight cars and a preparation method thereof, belonging to the technical field of brake pad materials. [0002] Background technique [0003] In the prior art, there are various types of high friction coefficient synthetic brake shoes for railway freight cars, and the preparation methods are different. However, most of them are prepared by the production process of using phenolic resin as a binder and thermocompression molding and curing. Synthetic brake shoes made of this material and process have been popularized in railway wagons with a speed of no more than 90km / h and an axle load of no more than 21t, and their performance can basically meet the braking requirements. With the development of international railway freight cars towards high speed and heavy load, the railway freight cars with a maximum operating speed of 120 km / h and an axle load of 23t-25t have be...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the contradiction between the manufacturing cost, stability and wear resistance of the high-friction coefficient synthetic brake shoes for railway freight cars required by the existing high-speed and heavy-duty railway freight trains, and provide A high-friction synthetic brake shoe for railway freight cars with better reliability, better stability, lower cost and simpler manufacturing process

Images