How to repair and install oilless sliding bearings?What should I pay attention to when installing?Oil-free sliding bearing is stable, reliable and noise-free when working. In addition, the oil film has a certain capacity of vibration absorption.
Oil free sliding bearing installation:
The main technical requirements for the assembly of oil-free sliding bearing are to obtain a reasonable clearance between the journal and the bearing, ensure the good contact between the journal and the bearing and sufficient lubrication of the copper sleeve, so that the journal rotates smoothly and reliably in the bearing.Assembly of oil-free integral sliding bearing:
(1) before assembly, deburr the shaft sleeve and bearing seat hole, clean and dry the oil-free bearing and apply lubricating oil in the bearing seat hole.
(2) according to the size of the shaft sleeve and the size of interference when fitting, the shaft sleeve shall be loaded into the bearing seat hole by knocking or pressing method and fixed.
(3) since the size and shape of the bearing seat are easy to change after the bearing sleeve is pressed on the hole, the inner hole shall be trimmed and inspected by means of reaming or scraping of the self-lubricating bearing to ensure a good fit between the journal and the bearing sleeve.
Oil-free sliding bearing maintenance:
The damage forms of sliding bearings include wear, melting, peeling and cracking on the working surface.The main reason for these defects is that the oil film is damaged for some reason, which results in direct friction between the journal and the bearing surface.For different forms of bearing defects, the repair method adopted is also different.
(1) the repair of integral sliding bearing, the general use of the replacement of the shaft sleeve.
(2) split sliding bearing slight wear, can be adjusted through the gasket, re-scraping method.
(3) if there is no serious abrasion on the working surface of the inner column and outer cone type sliding bearing, the clearance can be adjusted through the nut only when the precision dressing is done;When there is serious abrasion on the working surface, the spindle shall be removed, and the bearing shall be scraped again to restore its matching accuracy.When there is no adjustment margin, such as spraying method can be used to increase the diameter of the outer cone circle of the bearing, or the car to go to the cone surface of the small end part of the bearing, lengthening the length of the thread to increase the adjustment range and other methods.When the bearing deformation, wear is serious, it must be replaced.
(4) for multi-tile sliding bearing, when there is a slight scratch on the working surface, the inner surface of the bearing can be polished and repaired by grinding.When the working surface is seriously burned or worn by the axle, the inner surface of the bearing can be repaired by scraping.