Preparation method for thermoplastic-polyimide-based compound material for bearing retainer

Abstract

The invention discloses a preparation method for a thermoplastic-polyimide-based compound material for a bearing retainer. In the preparation method, thermoplastic polyimide is used as a base material, reinforcement and modification materials are added into the thermoplastic polyimide and comprise aramid fiber pulp fibers, graphite fluoride and teflon, wherein the aramid fiber pulp fibers are subjected to reflux cleaning, the cleaned aramid fiber pulp fibers, the thermoplastic polyimide and the graphite fluoride are subjected to vacuum drying, and then are synthesized into the thermoplastic-polyimide-based compound material; and the thermoplastic-polyimide-based compound material is hot-pressed on a hot press by using a retainer mould so as to form a bearing retainer tubular blank. The thermoplastic-polyimide-based compound material is low in density, small in friction coefficients and low in abrasion loss, and distortion temperature is greater than 270 DEG C; and the bearing retainertubular blank which is obtained through hot pressing is light, reduces the weight of a whole bearing, and improves the rotation speed and operation stability of the bearing, and obviously improves efficiency of a main machine.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a thermoplastic polyimide-based composite material for a bearing cage. [0002] Background technique [0003] The cages used in the main shaft bearings of aero-engines are mostly made of metal alloy materials. The cages made of metal alloy materials have many disadvantages, such as high density of metal alloy materials, easy eccentricity of mass, resulting in unstable operation and high frequency vibration And impact, damage the normal operation and efficiency of the engine. If the engine suffers from insufficient oil supply or even oil cut-off, the bearings equipped with metal alloy cages will be stuck. The reason is that the metal alloy cages are prone to wear at high temperatures, and the metal alloy materials are relatively hard. It is caused by the inability to form a short-term lubricating layer between the contact surfaces. [0004]...

AI Technical Summary

Problems solved by technology

[0005] The use of bearing cages made of non-metallic materials to replace bearing cages made of metal materials is one of the important issues in the development of aero-engines. The first thing that needs to be solved for this non-metallic material is that it can be used in a high temperature environment of 250 ° C. However, no non-metallic materials that can meet the above conditions have been reported.