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Discussion on the wear of plastic sliding bearings
Source: China Bearing Network Time: 2013-03-11
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The most important time for any sliding bearing is during the start-up period. At this moment, the smooth film is not formed and the bearing starts to work; this is the most common condition. Only the bearing is operated under load; the bearing will have slender wear. During the start-up period When the slender wear is sufficient, the fine outer wear surface of the shaft is filled with these fine wear particles; therefore, the optimal smooth film can be attacked during low-wear operation. After the start; the slender wear is reduced; these changes have little effect on the scale. In the continuous operation after the start of the launching period; the wear rate is small and stable.
For any type of plastic sliding bearing, it has the best working conditions; for example, the best cooperation axis data, roughness, optimal working pressure, speed, temperature, etc., the best for CSB-EP series plastic sliding bearings The cooperation axis data is hard chrome-plated surface. The roughness requirements for CSB plastic sliding bearings are different for each type of shaft. From Figure 3, we can see that the roughness requirements of CSB plastic sliding bearings for the shaft are from Ra0. 1 to Ra1. 6, and the best operating temperature for CSB-EP5 plastic plain bearings is not at normal temperature; EP5 exhibits the best conflict wear function at 160 °C.
Figure 3: CSB-EP series plastic sliding bearing cooperative shaft roughness CSB laboratory is found in the test of various working conditions. The wear modes of plastic sliding bearing operations are mainly the following:
The wear of the normal wear bearing under the correct cooperative application conditions, the wear of the bearing at the moment is mainly the result of the smooth material in the bearing during the initial operation of the bearing to the outer surface of the grinding shaft; when the erect smooth bearing is worn, the wear rate of the bearing is Gradually lowered.
åŒåŒ wear because the surface roughness of the shaft is too smooth, causing conflicts, and the outer surface of the shaft is too smooth; the smooth material in the plastic sliding bearing cannot be transported and filled into the outer surface of the shaft to form a smooth film; the collision of the ambition can not be established, at this moment the bearing The conflict coefficient is added; the required driving force is also added,
The furrow wears out because the shaft is too rough to cause the surface of the furrow to be scratched by the conflicting surface, and the unevenness of the shaft surface is too large; the smooth material conveyed from the bearing surface cannot form a strong and slick conflicting appearance, and the wear and tear of the attack is essentially scratched. Sexual wear,
Gluing wear is caused by the safe running temperature of the bearing or the gluing caused by the optical axis. When the operating temperature of the bearing exceeds the safe operating temperature of the bearing, the optical axis absorbs the wear and tear caused by the partially softened bearing conflict.
Burns and abrasions Because the running speed is too fast, the conflicting surface is burned and worn. When the running speed of the shaft exceeds the running speed of the bearing, it will cause conflicts. The conflict heat that rises due to the conflict rises sharply; the sharply rising conflict heat has the appearance of conflict. A rapid burn.
Of course, the wear and tear of plastic sliding bearings is an insurmountable appearance; in the case where the function of the plastic sliding bearing is now determined; we can only follow the operating rules of each type of bearing as much as possible; minimize the wear of the plastic sliding bearing. This will promote the function of the plastic bearing to the best.
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