Pneumatic compression and curing method for self-lubricating bushing

Abstract

The invention discloses a pneumatic compression and curing method for a self-lubricating bushing. The self-lubricating bushing comprises a bushing substrate and a PTFE fabric self-lubricating liner. A high temperature-resisting air bag which is cylindrical after air inflation is sleeved with the PTFE fabric self-lubricating liner, pneumatic compression is carried out on the air bag under room temperature via an inflator with a pressure meter; pressure in the air bag applies a force to the PTFE fabric self-lubricating liner until the pressure value on the pressure meter is the corrected value F1 of cured pressure and then air inflation is stopped and the air bag is sealed; the self-lubricating bushing with the air bag is put in an oven whose temperature is the room temperature T1; the oven is started to enable temperature inside the oven to reach the temperature T2 needed by curing of the PTFE fabric self-lubricating liner, the temperature T2 is kept for a period of time, and pressure suffered by the PTFE fabric self-lubricating liner is the cured pressure F2. The curing method has the advantages of greatly ensuring accuracy of cured pressure and reducing curing cost.

Description

technical field [0001] The invention relates to an inflation and pressure curing method for a self-lubricating bush. Background technique [0002] Self-lubricating bushing is a mechanical part with simple structure. The inner hole of self-lubricating bushing is pasted with high-performance PTFE fabric self-lubricating liner. It has the characteristics of maintenance-free, high wear resistance and friction reduction, and is widely used in aviation parts. . [0003] PTFE fabric self-lubricating gaskets generally use high-temperature curing thermosetting resins. Resin curing requires not only heating but also pressure. Different resins have different requirements for curing parameters. Generally, the curing temperature is above 160°C and the curing pressure is above 0.1MPa. How to control the pressure during curing is the key to whether the anti-friction and wear resistance properties of the self-lubricating liner can be fully exerted. At present, the method of curing and pre...

AI Technical Summary

Problems solved by technology

[0005] 1. The curing pressure cannot be monitored by using the curing mandrel. The curing pressure is calculated by calculating the expansion of the material and converted into the interference between the mandrel and the bushing, so as to estimate the pressure

[0006] 2. At present, the raw material of the mandrel on the market is impure, it is difficult to achieve isotropic linear expansion coefficient, and the machining characteristics are poor, and the machining accuracy and surface roughness are difficult to control. Therefore, it is easy to cause the inner hole size of the bush to be out of tolerance , the bushing is scrapped

[0007] 3. The dimensional stability of the mandrel is poor. After several times of use, the size will be significantly reduced. First, the size of the mandrel needs to be monitored to prevent waste products. Second, it needs to be re-fed. The economy is not strong, and it is difficult to adapt to mass production.