Common bearing quality problems cause analysis

High temperature bearing before the routine examination to be delivered to remove the oil seal packaging and will be immersed in the containing 3% oil washing gasoline or acid free kerosene and turned its circle and carefully washing cage, rolling body and rolling road and the junction, the requirements will be residual any hidden parts of the original grease thoroughly cleaned off. Bearing in clean should attached cleaning oil spray dry, placed in clean neutral lining paper lined with dry, or in the far infrared oven slowly drying. Since the dry cleaning oil spray after drying or drying, the whole process may not be rotating bearing ring, a retaining frame or any of the rolling elements. High temperature bearing

Have been dry or drying of the bearing should be required to drop into the lubricating oil and immediate delivery inspection, at the outer bearing surface no oil film protection, in the whole process of examination shall direct contact with human skin, the operator should wear clean gloves, or hand painted with anti rust agent, but must avoid in the hands of anti rust agent mixed with the bearing of the rolling surface, otherwise it will makes measurement results occurs deviation.

Bearing in the inspection is completed, should be immediately delivered to use or to carry out anti rust inventory processing, the whole process should also pay close attention to complete the inspection, so as not to lead to a long time caused by corrosion. Note that the use of pure gasoline without oil cleaning will also cause corrosion.

High temperature bearing before check also exiguous and check the gauge, standard parts and measuring instruments placed together in the examination place on a piece of sheet metal, which can quickly make these objects in the homogenization temperature and room temperature.

1, the bearing temperature is too high: institutional operation, installation parts of the bearing is allowed to have a certain temperature, when the hands touch body shell, should not feel hot to normal, instead it indicates that the bearing temperature is too high.

Bearing temperature is too high, the reasons are: the quality of lubricating oil does not meet the requirements or deterioration, lubricating oil viscosity is too high; body assembled too tight (lack of clearance); bearing assembly too tight; rotation of the bearing seat in the shaft or shell; overload; bearing retainer or rolling element fragments.

2, bearing noise: rolling bearing in the work permit to have a slight running noise, if the noise is too large or there is not normal noise or impact sound, then indicate that the bearing is faulty.

The reasons for the noise of rolling bearings: more complex (1) is the bearing inner and outer ring with the surface wear. Because of the wear and tear, the bearing and the shell, the bearing and the shaft of the coordination relationship, resulting in the axis of the correct position, in the high-speed movement when the abnormal sound. When the bearing fatigue, the surface of the metal peeling off, it will also make the bearing radial clearance increases produce abnormal sound. (2) the bearing lubrication is insufficient, forms the dry friction, as well as the bearing broken and so on to produce the abnormal sound. (3) bearing wear loose, loose cage damage, also can produce abnormal sound of bearing damage. When the rolling bearing is removed, the bearing's fault and damage can be judged according to the damage of the bearing.

3, the surface of the roller surface peeling off the surface of the bearing roller and the inner and outer rings are subjected to periodic fluctuating load, thereby producing the contact stress of the periodic variation. When the stress cycle number reaches a certain value, the fatigue spalling occurs on the working surface of the rolling element or the inner and outer ring of the outer ring. If the bearing load is too large, will make this fatigue. In addition, the bearing installation is not positive, the shaft bending, also can produce the rolling spalling phenomenon. The fatigue spalling of bearing roller will reduce the operation precision of the shaft, which will cause the vibration and noise of the mechanism.

4, bearing burn burn: bearing raceway and rolling body temper on. Burn the reason is the general lack of lubrication, lubricating oil quality does not meet the requirements or modification, and preloaded bearing etc..

5, plastic deformation: bearing roller contact with the contact surface of the uneven pits appear, to produce plastic deformation of the bearing. The reason is that the local stress of the working surface is more than the yield limit of the material under the action of large static load or impact load.

6, bearing ring crack: bearing race produce crack reason may be bearing with the tight, foreign or bearing inner ring is loose, the inclusion of bearing parts deformation, installation of bearing surface processing poor.

7, cage fragmentation: the reason is lack of lubrication, roller fragmentation, seat tilt etc..

8, keep the frame of the metal adhesion in the rolling body, the reason is that the ball is stuck in the cage or lubrication.

9, raceway: severe wear may be falling into the seat body, lack of lubricating oil or lubricating oil brand is not suitable.