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Usually bearings and shafts are linked together for use, the inner sleeve of the bearing is mounted with the shaft and the outer sleeve of the bearing is mounted with the bearing housing. In the operation process often occur running ring failure, which requires analysis and processing, otherwise it will cause an accident, resulting in greater losses.
A. Causes of bearing run-around
Bearing running ring is a common fault, the reasons for running ring are also many.
1、First of all, improper fit
As we know, the running bearing will produce heat, and there is a temperature difference between the shaft and the inner sleeve, the outer sleeve and the bearing body, which will cause changes in the tightness of the fit!
Bearing body temperature will also rise, once the bearing body expansion, bearing clearance disappeared, bearing inner jacket that is one, with the shaft turn, then, bearing jacket that is in the bearing body to do rotational movement, and generate a lot of heat, the accident occurred, bearing body bore also wear large. This is the temperature difference formed due to improper fit loosening caused by the running circle.
2、Vibration caused by the running circle
If the equipment vibration is larger, the greater the dynamic load on the bearing and bearing, the greater the shaft in operation as if being knocked, over time, the shaft will be whacked to extend, the journal becomes thin, which destroys the original with the tightness, the formation of micro-movement, heat, running circle conditions, the journal will be worn thin, the bearing body hole will be worn large.
3、Lubrication failure
Lubrication failure, friction generated more heat, bearing inner jacket, bearing body temperature difference, destroy the original with the size, bearing journal, bearing body wear.
4, improper selection of lubricant or even more impurities
When the grease hardness is very large or impurities, will give the bearing rolling body caused by playing weir effect, prevent the rolling body own rotation, generate friction heat, but also will drive the jacket in the bearing body selection, produce wear, when the resistance is large, this resistance can overcome the bearing inner sleeve and shaft friction, make the shaft and inner sleeve slip, produce sliding, cause wear.
5、Improper installation
Said improper installation mainly refers to, for example, bearing heating temperature is too high, bearing expansion, size can not be collected; shaft free end bearing remaining clearance is not enough, resulting in bearing side friction heat; bearing, shaft, bearing body cleaning is not clean, resulting in stagnation; split bearing seat fit mouth flattening bearing, resulting in bearing local stagnation and other undesirable conditions, these conditions will cause bearing heat, resulting in bearing running circle.
6、Long-term vibration and knocking
Long-term vibration knocking, will make the shaft side of the fatigue spalling, once the debris discharge, is bound to cause loosening, resulting in bearing run ring.
7、Bearing failure
Long-term operation of the bearing, the raceway will produce fatigue pitting, shedding debris will produce a weir effect, once the heat, while generating temperature differences, it will cause running circle.
Second, the processing of bearing running ring
Second, the processing of bearing running ring
In summary, the causes of bearing run-around are many, so when a failure or accident occurs, the causes must be analyzed to find the root cause of the accident, and then according to the specific circumstances, take appropriate measures to deal with. Specifically described as follows:
1、Pattern punching method
When the bearing running circle, sure shaft fine hole large, can be in the bearing surface or bearing body hole evenly hit some kind of punching eye, to raise the part to make up for the size change. This can temporarily solve the running problem.
2、Brush plating method
Through electroplating, the metal chrome is plated directly on the shaft or bearing body to restore the basic size.
3、Bonding agent method
When the shaft is worn or the bearing body hole is worn, it will cause the bearing to run, at this time you can choose a suitable metal adhesive, fill the contact area gap, solidification can be solved. It is important to note that the adhesive should only be used on closely fitting contact surfaces. For example, with the shaft rotation of the bearing inner sleeve, with the wheel rotation of the bearing jacket.
4、Welding turning method
By welding the worn part to fill on, and then through mechanical processing to the appropriate size, so as to restore the function of the parts. But the method because of welding will make the mechanical properties of the material changes, resulting in stress concentration, so should not be used in stress-sensitive parts.
5, set method
Set method is also a common method, that is, the first damage to avoid and even with part of the material processing down, and then processing a set set in the shaft or bearing body, and then with the surface processing to the appropriate size. The method requires attention to the strength of the set, and the damage to the shaft and bearing body. etc.
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The above is a common method to restore the use of bearings, a special account, the key or to analyze the shaft, bearing, bearing body wear causes, must eliminate these causes, the results of the treatment will be used for a long time, such as reducing vibration, improve lubrication, improve the quality of bearings, etc.
The above is a common method to restore the use of bearings, a special account, the key or to analyze the shaft, bearing, bearing body wear causes, must eliminate these causes, the results of the treatment will be used for a long time, such as reducing vibration, improve lubrication, improve the quality of bearings, etc.
