Plastic bearing material introduction

1. Precision full plastic bearings POM and PA materials have good mechanical strength and wear resistance, suitable for making relatively precise plastic bearings, its good self-lubricating properties and low coefficient of friction, on the basis of maintaining the traditional advantages of plastic bearings, Can be applied to precision and higher speed operation. Among them, POM plastic bearings are the most widely used among all plastic bearings. In general, POM or PA is used for the ball materials inside and outside, and glass fiber reinforced nylon 66 (GRPA66-25) is used for the cage. The ball is a glass ball, a stainless steel ball or a ceramic ball. This type of bearing performs well in an alkaline environment but is not suitable for operation under acidic corrosive environments.

2. Corrosion-resistant plastic bearings As the most typical varieties of fluoroplastics, PTFE and PVDF are the most excellent corrosion resistance, among which PTFE is the best corrosion resistance of all known engineering plastics and can be used for all concentrated acids. And concentrated alkali occasions, including HF and fuming sulfuric acid nitric acid (above 98%), etc., and have a good high temperature performance, PTFE proved to be used at high temperatures of 180 °C, PVDF can also be used to 150 °C, but PTEF material mechanical strength is extremely low , And the poor dimensional stability, temperature deformation, compared to PVDF has better overall performance, the general choice of inner and outer ring material PTFE or PVDF, cage material is PTFE or PVDF, the ball is generally glass ball or ceramic ball.

3. The acid-base plastic bearing HDPE, PP, UPE material has been proved to be able to use in relatively weak acid-base cross environment (30% CuCl2 solution and 30% NaoH solution test OK) so it is suitable for most acid/base/salt/ Solvent/oil/gas and seawater corrosive environment. Has the characteristics of oil-free self-lubrication, anti-magnetism and electrical insulation, etc. of general plastic bearings, but it has low mechanical strength and is easily deformed, so it is not suitable for larger loads and higher rotation speeds. In comparison, UPE materials have better strength. , Low friction characteristics and low temperature application characteristics (lowest to -150 °C), the general inner and outer ring materials using HDPE, PP or UPE, cage material using HDPE, PP or UPE, ball is glass ball, stainless steel ball or ceramic ball.

4.PEEK/PI plastic bearings (high temperature plastic bearings)

PEEK and PI, as emerging engineering plastics materials, have proved to be the best among all known engineering plastics in mechanical strength dimensional stability and high temperature resistance performance, in which PEEK long-term use temperature reaches 260°C and PI long-term use temperature is as high as 300°C. , And it has excellent corrosion resistance, can still run freely in medium-strength acid-base corrosion environment, it is generally used for the production of bearings that need to operate in harsh environments, the disadvantage is that the material itself is more expensive, so use The cost is relatively high. In general, PEEK or PI is used for the inner and outer ring materials, and PTFE, PEEK or PI is used as the cage material. The ball is generally a Zro2 or Si3N4 ceramic ball.

5. Plastic bearing seats and plastic spherical bearings Plastic seated bearings are light weight, easy to install, and maintenance-free. They also have shock-absorbing and shock-absorbing properties in common cast iron seats or stamping seats. With the continuous development of new materials, more and more projects are being widely used. For different situations, plastic spherical bearings can be made of different materials such as POM, HDPE, PP, UPE, PTFE, etc. Plastic bearing seats generally use PBT materials.