Novel processing method for powder metallurgy brake pad friction block

Abstract

The invention discloses a novel processing method for a powder metallurgy brake pad friction block. The novel processing method comprises the following steps: proportioning, mixing, compacting, splicing and vacuum sintering. Through repeated test, performance of the friction block is improved by 50% or more and production efficiency is improved by 6.8 times or more on the original basis; vacuum pressure sintering is adopted, compacting can be performed in a compacting machine like a common powder metallurgy part, so that the production period is remarkably shortened, and production cost is reduced; a friction layer of a friction plate obtained by a vacuum pressure sintering process has lower porosity, so that a friction coefficient is higher; the most outstanding point is that relatively high shear strength can be kept as the friction plate is subjected to vacuum high-temperature sintering along with the friction block; and meanwhile, dimension precision also can be guaranteed by precision of a graphene mould in a vacuum pressure sintering furnace. The novel processing method reduces processes in production, reduces bad links in a production process, reduces number of used workers,and further reduces production cost.

Description

technical field [0001] The invention relates to the technical field of production of metallurgical brake pad friction blocks, in particular to a novel powder metallurgy brake pad friction block processing method. Background technique [0002] High-speed trains refer to railway trains whose maximum speed reaches or exceeds 200km / h. With the rapid development of my country's high-speed railway and high-speed train technology, the performance requirements of the braking system are constantly improving. Brake pads are the key components of the basic braking system of high-speed trains, which directly affect the safety of train operation. Brake pads need to be high-speed The huge kinetic energy generated when the train brakes is converted into heat energy, so the brake pads are required to have high mechanical strength, good heat resistance and fatigue resistance. [0003] In the existing technology, the most widely used brake pads are powder metallurgy floating brake pads, which...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, the most widely used brake pads are powder metallurgy floating brake pads, which are mainly composed of friction blocks, support pads, back plates and spring clips, among which the friction blocks can be Partial floating, so as to obtain the maximum effective contact area of ​​the contact friction with the brake disc and a more stable and uniform braking pressure. However, during the braking process, because the friction block is frequently impacted by friction and thermal load, it is easy to produce The material fracture of the powder metallurgy friction body and the separation and peeling between the friction body and the steel back affect the safety of high-speed trains

[0004] The existing preparation method is to use a bell furnace for sintering. The preparation process is: compounding, mixing, pressing, pressureless sintering, assembling with rubberized friction plates, curing, and processing oil tanks. The preparation process is long and cumbersome. , using bell furnace for sintering, long production cycle and low production efficiency

Images