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FAG bearings to install the end of the host, such as measuring spindle runout, can be found in the measured value of each turn to have some changes; continuous measurements, can be found after a certain number of revolutions, this change will approximate repeated. Indicators to measure the degree of this change for the circular rotation accuracy, changes in approximate repeat accuracy required for the transfer on behalf of the cyclic rotation "quasi-periodic, the magnitude of changes in amplitude in the quasi-periodic cycle rotation accuracy is .
Be properly pre-load, such as the spindle speed will be gradually decreased to close to the obligations of speed "run" effect to the implementation of the bearing can improve the cycle of rotation accuracy of the spindle.
The main factors used to adjust the installation, use and maintenance, maintenance and meet the technical requirements. According to FAG bearing installation, use, maintenance, maintenance of technical requirements for the operation of FAG bearing contact load, speed, temperature, vibration, noise and lubrication condition monitoring and inspection, found abnormal immediately find out the reasons to be adjusted to return to normal. Installation conditions is one of the factors using the bearing is often caused by incorrect installation package state changes between the various parts of the loading capacity of the primary factors in the normal operation status, and life the early termination
Internal factors mainly refers to the structural design, quality manufacturing processes and materials, there are three factors determine the quality of the bearings.
The metallurgical quality of the bearing material is a major factor in early failure of the rolling bearing. With the metallurgical and technological progress (such as bearing steel, vacuum degassing, etc.), improve the quality of the raw materials. The proportion of raw material quality factor in the analysis of bearing failure has decreased significantly, but it is still one of the main factors bearing failure. Choose whether it is appropriate that must be considered bearing failure analysis.
Bearing manufacturing operation will go through the forging, heat treatment, turning, grinding and assembly processes. Deal with rational, advanced, and stability will also affect the life of the bearings. FAG bearings, heat treatment and grinding process, often associated with the failure of the bearing more directly related to product quality. In recent years, the deterioration of the research bearing on the surface layer, the grinding process is closely related to the quality of the bearing surface.
FAG bearing service life analysis of the main task is based on a lot of background material, data, and failure mode analysis, to identify the main factors that cause bearing failure, therefore, suggest improvements, to extend the service of bearing in order to avoid sudden bearing the incidence of early failure .
Power operation, start from no-load low-speed, slowly increased to the conditions stipulated in the rated operation. Test run to check the matters, whether there is abnormal sound, FAG bearing temperature changes, lubricant leakage or discoloration. If abnormal, should be immediately discontinued operation, check the mechanical, if necessary, to remove the bearing check.
Bearing temperature, and can be speculated that the external temperature of the bearing. However, the use of hole directly measuring the temperature of the bearing outer ring is more accurate. Bearing temperature gradually increased from the operation, usually 1 to 2 hours after temperature stabilization. FAG Bearings poor installation, the temperature will soar to abnormal high temperature. The reason lubricant such as excessive bearing clearance is too small, poor installation, and sealing devices friction is too large. Occasions of high-speed rotation, the bearing structure, the lubrication mode select error is also the reason.
FAG bearings to turn the sound with a stethoscope and other tests, there is a strong metal noise, abnormal sound, irregular sound explain abnormal. The reason for poor lubrication, poor shaft or bearing accuracy, bearing damage, dust and debris.
Bearing the following common faults:
1, tile surface corrosion: the spectra showed abnormal concentration of non-ferrous metal elements; many non-ferrous metal composition of submicron wear particles in the iron spectrum; excessive lubricant moisture, acid value exceeded.
2, the journal surface strain: iron cutting abrasive or black oxide particles in the iron spectrum, the metal surface tempering color.
3, the journal of surface corrosion: the spectra showed abnormal iron concentration and iron content in the sub-micron particles in the iron spectrum, excessive lubricating water or acid value exceeded.
Conditions of liquid lubrication, sliding surface lubricant to separate without the risk of direct contact, but also can greatly reduce the friction loss and surface wear, the film also has a certain vibration absorption ability
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 6921 NSK | 105 | 145 | 20 |
| 6821 NSK | 105 | 130 | 13 |