Needle roller bearing is a mass-produced mechanical part with strict manufacturing accuracy and high degree of technical specialization. Therefore, for the vast majority of bearing varieties that are easy to buy, it should be more cost-effective to buy than repair. Matters needing attention in analyzing load failure of outer spherical bearing
In addition to economy, the repair of bearing also has its technicality, which requires the repairer to fully understand the corresponding technical requirements of bearing and the characteristics of bearing and its parts in structure, process and materials, Otherwise, it is difficult to ensure the satisfactory effect of bearing repair.Matters needing attention in analyzing load failure of outer spherical bearing
benchmark invariant combined repair method.
When repairing and adjusting the accuracy of dimension chain, according to the principle of datum coincidence, only one datum plane is selected as the datum, that is, the design datum, while all other action surfaces are repaired based on this plane. Matters needing attention in analyzing load failure of outer spherical bearing
This combined repair benchmark is convenient to check the accuracy and reduce the accumulated error. For example, in the repair of variable speed hydraulic coupling, the bearing body is often used as the benchmark.Matters needing attention in analyzing load failure of outer spherical bearing
Datum transformation combined repair method
Sometimes the deformation of the design datum is too large to be used, so it is necessary to select some other planes as the datum and re integrate the dimension chain at the same time. For example, if the deformation of the bearing body is too large, the bearing body shall be reprocessed and corrected based on the rotating assembly, and then the assembly dimension chain shall be adjusted according to the size of the reprocessed bearing body.
The method of repairing the adjusting ring shall be adopted to detect and repair according to the arrangement order of the dimension chain, so as to control the accuracy of the closed ring.Matters needing attention in analyzing load failure of outer spherical bearing
Another function of Timken bearing sealing device is to prevent grease leakage from bearing components. If there is oil leakage, it will quickly destroy the normal lubrication of the bearing and burn out the bearing due to fever. In addition, the poor sealing device will not only cause spreading due to oil leakage, but also pollute mechanical equipment and processed products. Therefore, in order to make the machine operate normally, the bearing must have a good sealing device.
As soon as the outer spherical bearing rotates, the raceway surface of the inner ring and the outer ring is in rolling contact with the rolling element, so the running track is a dark surface. The running track attached to the raceway surface is not abnormal, so the load conditions can be known. Therefore, please pay close attention and observe the running track of the raceway surface when disassembling Timken bearing.Matters needing attention in analyzing load failure of outer spherical bearing
If you carefully observe the running track, you will know that it only bears radial load, large axial load, moment load, or extreme uneven rigidity on the bearing housing. It can be checked whether the unexpected load is added to the bearing and whether the installation error is too large, which will become a clue to investigate the damage cause of the outer spherical bearing.Matters needing attention in analyzing load failure of outer spherical bearing
Lubrication is very important, not only for Timken bearings, but also for all bearings. However, please note that the bearing should not add too much grease. Then it’s time to change the lubricant of the bearing.Matters needing attention in analyzing load failure of outer spherical bearing
After draining the old engine oil, if possible, the bearings lubricated with engine oil should be filled with fresh engine oil and let the machine rotate at low speed for a few minutes. Make the oil collect residual pollutants as much as possible, and then drain the oil.Matters needing attention in analyzing load failure of outer spherical bearing
When replacing the grease of the bearing lubricated with grease, the Joe remover used should avoid the contact of cotton with any part of the outer spherical bearing. Because these residual fibers may wedge between rolling parts and cause damage, especially in the application of small bearings.
Matters needing attention in analyzing load failure of outer spherical bearing
When inspecting the bearing, never expose the bearing to pollutants or moisture. If the work is interrupted, the machine shall be covered with oil paper, plastic sheet or similar materials. Matters needing attention in analyzing load failure of outer spherical bearing
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 the bearing assembly).Matters needing attention in analyzing load failure of outer spherical 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 Timken bearings with encrypted cover or dust-proof; 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.Matters needing attention in analyzing load failure of outer spherical bearing
Contact fatigue failure refers to the failure of bearing working surface caused by alternating stress. Contact fatigue spalling occurs on the working surface of the bearing and is often accompanied by fatigue cracks.Matters needing attention in analyzing load failure of outer spherical bearing
It first occurs from the large alternating shear stress below the contact surface, and then extends to the surface to form different spalling shapes, such as pitting or pitting spalling, which is called shallow spalling.Matters needing attention in analyzing load failure of outer spherical bearing
Wear failure refers to the failure caused by the continuous wear of the metal on the working surface caused by the relative sliding friction between the surfaces. Continuous wear will cause gradual damage to bearing parts, and eventually lead to the loss of bearing dimensional accuracy and other related problems. Matters needing attention in analyzing load failure of outer spherical bearing
Wear may affect the change of shape, the increase of fit clearance and the change of working surface morphology, may affect the lubricant or make it polluted to a certain extent, resulting in the complete loss of lubrication function, so that the outer spherical bearing loses the rotation accuracy and even can not operate normally. Matters needing attention in analyzing load failure of outer spherical bearing
Wear failure is one of the common failure modes of all kinds of Timken bearings. According to the wear form, it can be divided into common abrasive wear and adhesive wear.Matters needing attention in analyzing load failure of outer spherical bearing
There may be many factors affecting the service life of Timken imported bearings. The possible factors and internal friction sound have been further explained. The main factors used for adjustment are installation, use and maintenance, maintenance and repair, which meet the technical requirements. Matters needing attention in analyzing load failure of outer spherical bearing
According to the technical requirements for the installation, use, maintenance and maintenance of Timken imported bearings, the contact load, speed and lubrication status of the operating bearings are monitored and inspected. The direct cause of the abnormality is found and adjusted back to normal.Matters needing attention in analyzing load failure of outer spherical bearing
Installation conditions, one of the factors used for bearings is the load-bearing force that often causes the change of state between various parts of the incorrect installation package, the primary factor of abnormal state of bearing working temperature, vibration, noise, gradual progress, and the quality of raw materials has been improved. The proportion of raw material quality factor in bearing fault analysis has decreased significantly, but it is still one of the main factors of bearing failure.Matters needing attention in analyzing load failure of outer spherical bearing
Strictly inspect the raw materials of steel wire to prevent the raw materials with martensitic structure, decarburization, rough surface, surface transverse lines, cracks and other defects from entering the drawing process; Or after pretreatment, the material properties are improved before processing.Matters needing attention in analyzing load failure of outer spherical bearing
Prevent and improve the poor microstructure defects of the workpiece, such as coarse flake pearlite, reticular ferrite, etc.Matters needing attention in analyzing load failure of outer spherical bearing
Strictly control the metallurgical quality of NSK bearing steel wire, prevent the blank containing non-metallic inclusions and folding defects from entering the processing process, and avoid brittle fracture failure of steel wire parts.Matters needing attention in analyzing load failure of outer spherical bearing
The steel wire with element segregation found in the raw material inspection can be subject to preliminary heat treatment to eliminate defects and improve the structure. If normalizing treatment is adopted in a protective atmosphere, the harm of segregation can be reduced.Matters needing attention in analyzing load failure of outer spherical bearing
Whether the selection is appropriate or not is still a bearing fault analysis that must be considered. Bearing manufacturing will be adjusted and restored to normal through forging, heat treatment, turning and lubrication conditions to monitor and check the direct causes of abnormalities. Matters needing attention in analyzing load failure of outer spherical bearing
The installation condition is one of the factors for using the bearing. It is the primary factor of the bearing capacity that often causes the state change between various parts of the incorrect installation package. Matters needing attention in analyzing load failure of outer spherical bearing
In the abnormal operation state and the early termination of the inner life, the main factors refer to the structural design, high-quality manufacturing technology and materials. There are three factors that determine the quality of the bearing.Matters needing attention in analyzing load failure of outer spherical bearing
Timken imported bearings are superior. Even if the shape becomes a low buzzing sound, there will be knocking noise when injured. This noise will collide and diverge according to the speed of Timken imported bearings.Matters needing attention in analyzing load failure of outer spherical bearing
If there is intermittent noise, it is through. If sharp’s hissing, squeaking and other sounds do not follow the rules, Timken imported bearings that often perform poorly will reveal or even reverse the situation.Matters needing attention in analyzing load failure of outer spherical bearingMatters needing attention in analyzing load failure of outer spherical bearing
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