Copper-based powder metallurgy high speed brake lining

Abstract

The invention provides a copper based powder metallurgy high speed brake lining, which comprises a steel backing, a brake block, a framework, a spring washer and a swollen tail block. In the course of braking, the brake lining has smaller abrasion loss and can effectively prevent the edge dropping, angle dropping and camber wear of the brake block. The brake block uses copper based powder metallurgy friction material; copper powder, iron powder, tin powder, chromium powder, titanium powder, nickel powder, bismuth meal, graphite, boron nitride, aluminum oxide, silicon dioxide, zirconite and the like are well blended according to the proportion, stamped and sintered on the framework after cold pressing. The copper based powder metallurgy high speed brake lining has the characteristics of high mechanical strength, good thermal conduction, good thermal stability, strong heat-resistant fade performance, long service life, small abrasion on a retarding disc and stable friction performance and the like, and can effectively control very high way trains with 200-300km / h per hour.

Description

technical field [0001] The invention relates to a brake device for a high-speed train, in particular to a copper-based powder metallurgy high-speed brake pad. Background technique [0002] High-speed brake pads are matched with the bogies of EMUs and are important braking components in braking devices and braking systems. Brake discs and brake pads are the original friction pairs of the disc brake system, and their braking performance mainly depends on the material and performance of the brake pads and brake discs. When a high-speed train brakes, the temperature of the brake disc and brake pad is as high as 500°C, and can reach 1000°C instantaneously. Because the powder metallurgy friction material has a stable friction coefficient, good wear resistance and heat resistance, and low production Due to advantages such as cost, experts and manufacturers in this field at home and abroad have extensively carried out the research and development of powder metallurgy high-speed bra...

AI Technical Summary

Problems solved by technology

[0003] During the train braking process of the powder metallurgy high-speed brake pads in the prior art, due to the high temperature of the friction surface between the brake disc and the powder metallurgy brake block, the periphery of the powder metallurgy brake block is prone to drop edges and corners, resulting in a large amount of wear and tear. The movement is not stable enough, the friction coefficient is low, the braking distance is long, and the eccentric wear of the brake pads is prominent during braking

[0004] In order to solve the above shortcomings, someone wraps the side of the powder metallurgy brake block with a thin plate or a mesh belt to form the edge of the brake block. The brake block with this structure greatly reduces the friction area of ​​the powder metallurgy friction material, resulting in the same speed and braking pressure. The energy absorbed per unit area of ​​the powder metallurgy brake block is greater, resulting in excessive temperature of the friction surface of the brake disc and the powder metallurgy brake block, increasing the wear of the brake disc and the powder metallurgy brake block, and reducing the thermal stability of the powder metallurgy material. Reduce the service life of brake discs and high-speed brake pads, and the phenomenon of eccentric wear is still very serious

Images