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Abrasive wear refers to the wear caused by the relative movement of the contact surface due to the Failure Classification extrusion of foreign hard particles or hard foreign matters or wear debris on the metal surface between the working surfaces of imported bearings, which often causes furrow like scratches on the working surfaces of bearings.
Hard particles or foreign matters may come from the inside of the host machine or from other Failure Classification adjacent parts of the host system and are sent into the bearing by the lubricating medium. Adhesive wear refers to the uneven stress on the friction surface due to the micro bulge or foreign matter on the friction surface.
When the lubrication conditions are seriously deteriorated, the Failure Classification local deformation and friction micro welding of the friction surface are easy to be caused due to the heat generated by local friction. In serious cases,
the surface metal may be locally melted, and the force on the Failure Classification contact surface will tear the local friction welding point from the substrate and increase the plastic deformation.
Generally speaking, slight adhesive wear is called scratch Failure Classification and severe adhesive wear is called bite
The main reasons for the fracture failure of imported bearings are defects and overload. When the Failure Classification external load exceeds the material strength limit and causes the part to break, it is called overload fracture. Overload is mainly caused by sudden failure or improper installation of the host.
Defects such as microcracks, shrinkage cavities, bubbles, large foreign objects, overheated tissue Failure Classification and local burns of bearing parts will also cause fracture at the defect during impact overload or severe vibration, which is called defect fracture.
It should be pointed out that in the manufacturing process of Failure Classification bearings, the presence of the above defects can be correctly analyzed by instruments in the factory re inspection of raw materials, quality control of forging and heat treatment, and processing process control,
and the control must still be strengthened in the future. But Failure Classification generally speaking, most of the bearing fracture failures are overload failures.
The outer spherical bearing fixes the bearing inner ring and the shaft through the eccentric sleeve, and the hexagon socket screw on the eccentric sleeve plays a fastening role.
During maintenance, many operators cannot disassemble this bearing, so it is necessary to introduce the technical points and precautions for disassembling and assembling the outer spherical bearing:
1、 Dismantle
1. First loosen the locking screw on the bearing eccentric sleeve with an Allen wrench, then insert a small iron rod into the counterbore on the top cover eccentric sleeve, and loosen the eccentric sleeve against the rotation direction of the shaft.
2. Loosen the bolts fixing the bearing seat. Remove the bearing together with the bearing seat from the shaft. Before removing the bearing seat at one end of the shaft, loosen the bolts of the bearing seat at the other end of the shaft to avoid damage to the bearings at both ends.
2、 Installation
1. Before installing the bearing on the shaft, the fixing pin of the bearing sleeve must be pulled out, the surface of the journal must be polished smooth and clean, and the journal shall be coated with oil for rust prevention and lubrication (the bearing is allowed to rotate slightly on the shaft).
2. Apply lubricating oil on the mating surface of bearing seat and bearing, and install the bearing into the bearing seat. Then sleeve the assembled bearing and bearing seat on the shaft. Push it to the required position for installation.
3. Do not tighten the bolts fixing the bearing seat first, and make the bearing sleeve rotate in the bearing seat. Similarly, install the bearing and seat at the other end of the same shaft, rotate the shaft for several turns, and let the bearing itself automatically align. Then fasten the bearing seat bolts.
4. Install eccentric sleeve. First put the eccentric sleeve on the eccentric step of the bearing inner sleeve and tighten it by hand along the rotation direction of the shaft.
Then insert or counter the small iron rod into the counterbore on the eccentric sleeve. Knock the small iron rod along the rotation direction of the shaft with a hand hammer to firmly install the eccentric sleeve, and then lock the Allen screw on the eccentric sleeve.