Study On The Wear Of Plastic Sliding Bearing
Wear resistance of plastic plain bearings mainly depends on wear resistance of plastic sliding bearing material itself, but plastic plain bearings wear and is closely related to the following factors: grinding the material, hardness, roughness, running speed, bearing loads, ambient temperature, humidity and so on; as a manufacturer of plastic sliding bearing, always optimize plastic wear resistance of the bearing material and provide the correct selection guide ; But as the user to follow the plastic bearings manufacturer product manuals on the plastic sliding bearing selection and assembly instructions.
Any bearing the most critical moment of the start-up phase. At this point, the formation bearing lubricating film has not started working, this is the most common case. When the bearing under load, bearing it will have slight wear. In the start-up phase, when minor wear fully, you will use these tiny wear particles fill the outer surface of the shaft, so low wear work can have an optimal lubricating film. Once started, minor wear and tear falling rapidly, and effects of these changes on little. After the end of the starting phase of continuous work, wear small and stable.
For any type of plastic sliding bearing are matched with the best working conditions, such as the optimum material, roughness; best work under pressure, speed, temperature, etc; on the optimum material for CSB-EP Series plastic bearing surface hard chromium plating; roughness on CSB plastic plain bearings for each type of shaft roughness requirements are not the same, We can see from Figure 3, CSB plastic sliding bearing for roughness requirements of axis from Ra0.1 Ra1.6; and on the best use of CSB-EP5 plastic bearing temperature is not at room temperature, EP5 at a temperature of 160 ° c the friction and wear performance.
CSB laboratory constantly imitated found tests under various operating conditions, plastic sliding bearing wear occurs in the work mainly in the following ways:
Normal wear and tear-the correct fit of the bearing wear and tear occurs under conditions of use; bearing wear is mainly for work in the initial stage of bearing lubrication material result of shifting to the shaft surface grinding, when you build an ideal lubrication under bearing wear rate gradually decreased.
Creep and wear-as too smooth shaft surface roughness cause friction surface crawling shaft surface is too smooth, lubrication of plastic sliding bearing material cannot be transferred into the shaft surface crater formed film, makes the ideal of friction pairs could not be established; the friction coefficient of bearings, drive force required increases;
Furrow wear-friction surface scratches due to axis too rough furrows; shaft surface height difference too great from the lubrication of the bearing surface to form ideal smooth surface of the material cannot be firmly; now wear the essence is scratch and wear;
Bond abrasion – due to exceeding the bearing operating temperature or shaft caused by gluing; shaft in the bearing operating temperature exceeds the allowed operation temperature adsorption has been bearing wear of the friction surfaces and the formation of local softening.
Burns wear and friction-caused by running too fast burn wear running faster than the permissible operating speeds can cause friction bearing surface friction heat to rise sharply due to friction, a sharp increase of frictional heat has a fast burn on friction surfaces.
Plastic sliding bearing wear and tear is inevitable, of course, in the case of plastic sliding bearing performance have been identified, we can only follow the rules of each different bearing as possible will minimize the wear of plastic sliding bearing, which to the best performance of the plastic bearing.