1. The precise plastic bearings
POM and PA materials have good mechanical strength and wear resistance, suitable for making more accurate plastic shaft bearing, its good self-lubricating performance and low friction coefficient, in keep plastic bearing on the basis of traditional advantages and can be used in precision and higher speed operation. Including POM plastic bearing is all plastic bearing most widely used in a, general internal and external ball materials used in the POM or PA, keep wearing USES glass fiber reinforced nylon 66 (GRPA66-25). Ball for glass ball, stainless steel ball or ceramic ball, these bearings alkaline environment well but not for running in acidic corrosive environment.
2. Corrosion resistant plastic bearings
As the most typical fluorine plastic varieties, PTFE and PVDF is a most excellent corrosion resistance, including PTFE is all known engineering plastic in corrosion resistance best, can be used for all concentrated acid and strong alkali occasions, including HF and oleum nitric acid (98%) etc, and has good high performance, PTFE proof can be used for the high temperature, PVDF 180 ℃ to 150 ℃ can also, but PTEF material mechanical strength is extremely low, and dimensional stability is poorer, temperature deformed, compared PVDF have better comprehensive performance, general internal and external ring material chooses PTFE or PVDF, keep frame materials for PTFE or PVDF, ball is commonly glass ball or ceramic ball.
3. Fight acid-base plastic bearings
HDPE, PP, UPE materials has proved to be used in comparatively weak alkali crossover environment (30% Cucl2 solution and 30% NaoH solution test OK) so suitable for most acid/alkali/salt/soluble oil/gas and jiaoji/seawater corrode environment. Have generally plastic bearing without oil self-lubricating, resist magnetoelectricity insulation performance, but low mechanical strength, easily, so unwell for larger load and high speed, in comparison, the UPE materials have better intensity, low friction characteristics and low temperature application characteristics (minimum to - 150 ℃), general internal and external circle materials used in the HDPE, PP or UPE, keep frame materials used in the HDPE, PP or UPE, ball for glass ball, stainless steel ball or ceramic ball.
4. PEEK/PI plastic bearings (high temperature resistant plastic bearing)
PEEK and PI as emerging engineering plastic materials, prove all known engineering plastics dimension stability and mechanical strength, high temperature resistant performance of the best long-term use of PEEK 260 ℃ temperature, PI long-term use ℃, the temperature is as high as 300 and of its excellent corrosion resistance, acid in medium strength corroded environment can still function properly, so commonly used for making need in comparative harsh environment of bearings, precision operation because of material itself its shortcoming is relatively expensive, so use cost is higher, general internal and external ring material chooses PEEK or PI, keep frame materials for PTFE, PEEK or PI, ball Si3N4 ceramics is generally Zro2 or ball.
5. Plastic housing and plastic outside spherical bearings
Plastic insert bearing unique light weight, convenient installation, maintenance, and has often free seat or stamping seat cast that do not have suspension shock resistance. With the continuous development of new materials are increasingly widely applied in engineering. According to different situations, plastic outside spherical bearing can use POM, HDPE, PP, UPE, PTFE different materials production, plastic housing generally USES PBT material.