Plastic sliding bearing of the common faults and elimination method

Due to the size of the diameter of axle and bearing hole measurement inaccuracy or cooperate with surface roughness, do not meet the standard requirements to cause excessive interference fit, make plastic sliding bearing race is being squeezed from a large, resulting in the radial clearance of bearing itself is reduced, the bearing rotating difficulties, fever, wear or jammed, caused serious bearing inner and outer race in cracking during installation. Not rotating seat clearance or interference is often used not to cooperate, so not rotating seat is likely to produce tiny creep, and make the seat and the contact surface of roller changing, seat ring raceway wear uniform. At the same time can also eliminate the shaft in the bearing due to thermal elongation roller axial stuck phenomenon. Clearance fit, but too much will make not rotating seat with roller rotation, the axis ( Or bearing hole) And the inner race ( Or the seat) Serious wear and friction bearing heating, vibration occurs. 1, plastic sliding bearing surface strain: iron spectrum found cutting abrasive, abrasive ingredients for non-ferrous metal. 2, plastic sliding bearing journal surface corrosion: spectrum analysis found that iron concentration is unusual, there are a lot of iron in iron spectrum of submicron particles, water or high acid value oil paint. 3, plastic sliding bearing tile surface corrosion: spectrum analysis found that abnormal non-ferrous metal element concentration; Iron spectrum appeared a lot of non-ferrous metal components in sub-micron wear particles; Lubricating oil excess moisture, acid value exceeds bid. 4, plastic sliding bearing bush back micro wear: spectrum analysis found that iron concentration is unusual, there are a lot of iron in iron spectrum wear submicron particles, lubricating oil moisture and acid value anomalies. In liquid lubrication condition, the sliding surface is lubricating oil without direct contact, also can greatly reduce the friction loss and wear of surface oil film also has a certain vibration absorbing ability, plastic sliding bearing journal surface strain: iron spectrum contains iron series cutting grinding grain or black oxide particles, metal surface heat tint. 6, superfinishing plastic sliding bearing does not produce peak of the metamorphic layer, and is easy to wear, but also left by grinding metamorphic layers can be removed. To improve the service life of the workpiece by about 5 times. Smooth operation. 8, superfinishing plastic sliding bearing grinding allowance allowance than reduce an order of magnitude, in fact, only a few microns. For low pressure feed processing. So the superfinishing size dispersity is small, high pass rate. 9, superfinishing plastic sliding bearing for overlapping curve surface, easy to save oil, there will not be easy to wear and is used when grinding heat and burn research phenomenon. 10, superfinishing plastic sliding bearing has a complex trajectory, but also by cutting role transition to grinding, can quickly reduce the surface roughness. But because of its vibration have repeatedly change direction, affect their further improve the quality of processing surface. Diagnosis: 1) The noise from the lower cylinder body near the crankcase. Oil pressure decreases obviously. Engine in the condition of low and medium speed jitter throttle, a clear and depressing continuous beat accompanied by engine vibration phenomenon. 2) High speed engine, the body vibration is larger, a significant reduction in the oil pressure at the same time, it is plastic sliding bearing and journal clearance is too large or bearing alloy ablation fall off. 3) Single cylinder fire test sound a little change, and the adjacent two cylinder break fire sound significantly diminished or disappeared, it is between the two cylinder crankshaft bearing ring. 4) Speed is not high but the body vibration is larger, a swing shaking phenomenon, at the same time issued a heavy and large 'boom boom' tapping is a fracture. 5) Increases with temperature rise and noise to the sound become cluttered, may be the crankshaft bending.