Are CSB's plastic plain bearings wear resistant?What is the sleeves' service life?These are the questions that users who are beginning to use plastic plain bearings ask most often and are also the issues that induce the most concern. Our material development engineers have consistently devoted their attention to the wear resistance of the material used in our plastic plain bearings.n spite of the fact that we have several decades of self-lubricating bearing design and manufacturing experience, and have accumulated large amounts of laboratory test data, we still cannot directly answer questions of this kind. The service life of any kind of plastic sleeve depends on numerous factors, and is not entirely determined by the inherent wear resistance of the plastic sleeve material. We can only determine plastic sleeve service life with a degree of accuracy when the sleeves are used in similar applications in the same industry; service life determined from practical applications is more reliable than service life estimated from technical data and laboratory test data.
The chief factor determining the wear resistance and life of plastic sleeve and other types of self-lubricating bearings is nevertheless the performance of the bearing material. On the other hand, factors such as the bearing design PV and application PV value, movement characteristics, load, velocity, ambient temperature, grinding axis material, hardness, surface roughness, seat hole material, and operating/stopping time ratio, etc. are closely connected with actual service life. With regard to plastic sleeve movement characteristics, some plastic plain bearings are suitable for continuous rotation, while other plastic plain bearings are suitable for pivoting. For instance, the service life of EPB12 plastic plain bearings used as high-load pivots is 1.5 times that of sleeves used for continuous rotation. In contrast, the service life of EPB14A plastic plain bearings used for continuous high-speed rotation is nearly three times that of the same sleeves used in pivoting movement. The shaft material also has a significant influence on plastic sleeve service life. The service life of EPB13 plastic plain bearings used together with hard anodized shafts is far longer than that of the same sleeves used with non-anodized chrome steel shafts. The wear resistance of EPB8 plastic plain bearings immersed in water is 3.5 times that of the same bearings subject to dry friction.
While the wear resistance of plastic sleeve material has a decisive influence on service life, the other factors affecting ultimate service life cannot be ignored. In this case, we can only rely on technical data and test results to select the correct plastic sleeve material and achieve the maximum theoretical service life. Although CSB's testing center can determine estimated service life based on various simulated user operating conditions, each user's actual designs and usage may vary wildly. In summary, we can only use large quantities of historical monitoring data to infer the useful life of various bearing materials under certain kinds of working conditions, but cannot provide an exact service life cycle unless we have a completely identical case of usage.