There are many reasons for the loss of ina universal joint bearing. All influencing factors in the design and manufacturing process will be related to the loss of bearing, which is difficult to judge by analysis.
However, in general, it can be considered and analyzed from two aspects: use factors and internal factors.Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
The use factor of loss ina universal joint bearing mainly refers to whether the installation, adjustment, use and maintenance, maintenance and repair meet the technical requirements. The installation condition is one of the primary factors in the use factors.
The improper installation of ina universal joint bearing often leads to the change of the stress state between the parts of the whole bearing, and the bearing runs and loses in an abnormal state.Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
1. Friction compatibility
When the bearing shaft diameter is in direct contact with the bearing bush, the adhesion and smooth boundary performance shall be avoided.Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
2. Clamping ability
The information allows the clamping of foreign hard particles in the smoothing agent to avoid scratching or (and) abrasive wear. For metal materials, those with low hardness and elastic modulus have good clamping performance, while non-metallic materials are not necessarily.
For example, carbon graphite has low elastic modulus, but poor clamping performance. Ina universal joint bearings usually use softer data and harder data to form friction amplitude, and generally use softer data as bearing bush.Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
3. Running in
In the running in process of ina universal joint bearing between shaft diameter and bearing bush, the parameter values of shaft diameter and bearing bush processing error, coaxiality error and surface roughness are reduced to make the contact average, so as to reduce the ability of friction and wear rate.Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
4. Friction compliance
The elastic-plastic deformation of the surface layer is used to compensate the initial poor fit of the friction surface of ina universal joint and the flexural performance of the shaft. The data with low elastic modulus have better compliance.Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
5. Wear resistance
The ability to resist wear and tear. Under regular wear conditions, the wear resistance is expressed by the wear rate or the reciprocal of wear degree and wear amount.Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
6. Fatigue resistance
The ability of data to resist fatigue damage under cyclic load. Under the application temperature, the strength, hardness, impact strength and average structure of bearing bush data are very important to fatigue. Materials with good running in and clamping in performance usually have poor fatigue resistance.Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
7. Corrosion resistance
The ability of data to resist corrosion. When the smooth oil is used in the atmosphere, it will gradually oxidize and produce acidic substances. Moreover, most smooth oil also contains extreme pressure additives, which will corrode the bearing data of ina universal joint. Therefore, the bearing data of ina universal joint needs to have corrosion resistance.Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
8. Cavitation resistance
When the solid phase moves with respect to the liquid, when the bubbles in the liquid break near the solid surface, partial impact high pressure or partial high temperature will be generated, which will lead to cavitation wear. The ability of data to resist cavitation wear is called cavitation resistance. Generally, copper lead alloys, bearing alloys and Al Zn Si alloys have good cavitation resistance.Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
9. Compressive strength
Ina universal joint bearing can accept unidirectional load without being crushed or changing size.
When checking the bearing, do not expose the ina universal joint bearing to pollutants or moisture. If the work is interrupted, the machine shall be covered with oil paper, plastic sheet or similar materials. If it is possible to clean the naked bearing without disassembly, clean it with a brush coated with petroleum solvent, and then wipe it dry with a piece of lint free cloth or blow it dry with compressed air (be careful not to start the rotation of ina universal joint bearing assembly). Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
Use a small mirror and a probe similar to that used by dentists to check the track surface, retainer and beads of the bearing. Do not clean the sealed cover or dust-proof bearing; Just wipe the outer surface.
If the bearing is damaged, it needs to be replaced. It is much more economical to replace the bearing during the regular shutdown and maintenance period than the loss of sudden shutdown due to the damage of the array bearing.Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
Grease lubrication includes the sealing method of filling grease in the sealed bearing in advance, and the filling grease supply method of filling an appropriate amount of grease in the shell and replenishing or replacing it at regular intervals. In addition, the centralized grease supply mode with pipes connected to each lubrication place is also adopted for the machinery with multiple IKO bearings that need lubrication.
Grease lubrication can be filled with grease for a long time without supplement, and the structure of its sealing device is relatively simple, so it is widely used. Oil lubrication is relatively simple. Regular lubrication can improve the service life of micro bearings.Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
The imported bearing is allowed to make slight running noise during operation. If the noise is too loud or there is abnormal noise or impact sound, it indicates that the bearing is faulty.Improper treatment of Vibration Affecting the stable operation of IKO micro bearing
The causes of rolling bearing noise are complex. One is the wear of the mating surfaces of the inner and outer rings of the bearing. Due to this wear, the matching relationship between bearing and shell, IKO bearing and shaft is damaged, resulting in the axis deviation from the correct position and abnormal noise when the shaft moves at high speed.
When the micro bearing is tired, the metal on its surface will peel off, which will also increase the radial clearance of the bearing and produce abnormal noise. In addition, insufficient bearing lubrication, dry friction and bearing breakage will produce abnormal sound. After the bearing is worn and loose, the cage is loose and damaged, which will also produce abnormal noise.
When the mechanism is running, the part where the bearing is installed is allowed to have a certain temperature. When touching the mechanism shell by hand, it should be normal to feel that it is not hot. Otherwise, it indicates that the bearing temperature is too high.
The reasons for high bearing temperature include: the quality of lubricating oil does not meet the requirements or deteriorates, and the viscosity of lubricating oil is too high; The mechanism assembly is too tight (insufficient clearance); The micro bearing assembly is too tight; The bearing race rotates on the shaft or in the shell; Excessive load; Broken bearing cage or rolling element, etc.
Selection and control of shaft and bearing housing tolerance: the bearing shall rotate flexibly without blocking feeling after being pressed into the bearing. If there is obvious inflexible rotation, it indicates that the size of the shaft is too large and the tolerance should be reduced.
If the IKO bearing rotates by hand after being pressed into the shaft, there is an obvious “rusty” feeling, it may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, when controlling the tolerance of shaft and bearing chamber, it is also necessary to control the roundness. At present, many domestic manufacturers only control the tolerance, not the roundness.
Because the micro bearing is a high-precision product, if it is not assembled properly, it is easy to damage the bearing channel and lead to bearing damage.
The bearing shall be equipped with a special mold during assembly, which cannot be knocked at will. When pressing the shaft, only the small ring can be stressed, and when pressing the large ring, only the large ring can be stressed. Air pressure or hydraulic pressure is required during assembly.