Adequate lubrication of SKF combined bearing, correct use and common faults

“Adequate lubrication SKF combined bearing is crucial for the optimal performance and longevity, which are mechanical components that integrate multiple rolling elements and usually require specialized lubrication to operate efficiently in a range of demanding applications.”However, grease lubrication has the advantage of simplifying the structure around the bearing. Compare the advantages and disadvantages of grease lubrication and oil lubrication. There are generally two kinds of fault phenomena of rolling bearing: one is that the temperature of the bearing installation part is too high, and the other is that there is noise in the bearing operation.

The rolling 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.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 the bearing and the shell and between the bearing and the shaft is damaged, resulting in the axis deviation from the correct position and abnormal noise when the shaft moves at high speed.

When SKF Bearing is tired, its surface metal will peel off, which will also increase the radial clearance of the bearing and produce abnormal noise. In addition, the insufficient lubrication of the combined bearing, the formation of dry friction and the breakage of the bearing will produce abnormal sound. After the bearing is worn and loose, the cage is loose and damaged, which will also produce abnormal noise.Adequate lubrication of SKF combined bearing, correct use and common faults
The bearing rolling element and the inner and outer race raceways bear the action of periodic fluctuating load, resulting in periodic contact stress. When the number of stress cycles reaches a certain value, fatigue spalling will occur on the working surface of rolling element or inner and outer race raceway. Adequate lubrication of SKF combined bearing, correct use and common faults
If the load of the bearing is too large, it will aggravate this fatigue. In addition, improper bearing installation and shaft bending will also produce raceway spalling.Adequate lubrication of SKF combined bearing, correct use and common faults
The fatigue spalling of bearing raceway will reduce the operation accuracy of shaft and cause vibration and noise of mechanism.Adequate lubrication of SKF combined bearing, correct use and common faults

There is a return fire color on the raceway and rolling element of the burned bearing. The causes of burns are generally insufficient lubrication, unqualified or deteriorated lubricating oil quality, and too tight bearing assembly.Adequate lubrication of SKF combined bearing, correct use and common faults.Adequate lubrication of SKF combined bearing, correct use and common faults
Uneven pits appear on the contact surface between the raceway and the roller of the bearing, indicating that the SKF Bearing has plastic deformation. The reason is that under the action of large static load or impact load, the local stress on the working surface of the bearing exceeds the yield limit of the material, which generally occurs on the combined bearing rotating at low speed.Adequate lubrication of SKF combined bearing, correct use and common faults
Adequate lubrication of SKF combined bearing, correct use and common faults.Adequate lubrication of SKF combined bearing, correct use and common faults
The reasons for the cracks of the bearing race may be the tight fit of the bearing, the looseness of the foreign or inner ring of the bearing, the deformation of the containing parts of the bearing, the poor surface processing of the installed bearing, etc.Adequate lubrication of SKF combined bearing, correct use and common faults
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.Adequate lubrication of SKF combined bearing, correct use and common faults
The reasons for the high temperature of SKF Bearing are: 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 assembly of combined bearing is too tight; The bearing race rotates on the shaft or in the shell; Excessive load; Broken bearing cage or rolling element, etc.Adequate lubrication of SKF combined bearing, correct use and common faults
When SKF Bearing is working, due to the influence of external or internal factors, the original matching clearance is changed, the accuracy is reduced, and even “bite” is called clearance change failure. External factors such as excessive interference, improper installation, expansion caused by temperature rise, instantaneous overload, etc., and internal factors such as residual austenite and residual stress in an unstable state are the main reasons for the change and failure of clearance.Adequate lubrication of SKF combined bearing, correct use and common faults
Rotate the outer ring and carefully wash the junction of cage, rolling body and raceway. Any previously hidden part of oil residue needs to be thoroughly cleaned. Bearings should be attached after washing clean, Youlin dry cleaning, clean lined neutral meter support dry, or in the far-infrared drying oven slowly. Adequate lubrication of SKF combined bearing, correct use and common faults
Since even dry cleaning, Youlin drying or drying, the whole process should not put SKF Bearing Rings and adhere to any frame or rolling body. Universal joint bearing oil can be removed from the oil sealed package and immersed in acid free 3% kerosene or gasoline before delivery test in practice.Adequate lubrication of SKF combined bearing, correct use and common faults
Inspection of dripping lubricating oil and immediate delivery of dry or dry bearings shall be required. At this time, there is no oil film to protect the outer surface of SKF Bearing. The inspectors are not allowed to directly contact the skin in the whole process. The operators should wear clean gloves and draw rust by hand, but they must avoid mixing the antirust agent with the appearance of rolling bearing, otherwise the deviation of measurement results will be.Adequate lubrication of SKF combined bearing, correct use and common faults
The rusty stock shall be delivered immediately or handled, and the bearing shall be inspected after the whole inspection process is completed. Take too long to avoid corrosion. Pay attention to the use of clean and oil-free pure gasoline, which can also cause corrosion.Adequate lubrication of SKF combined bearing, correct use and common faults
If the bearing is dry or dry, check the outer surface without bearing oil film protection according to the regulations, drip lubricating oil and deliver it immediately. At this time, manpower in direct contact with the skin is not allowed in the whole inspection process. The operator should wear clean gloves and draw rust by hand, but must avoid mixing hands on the rolling surface of universal joint bearing with rust inhibitor, otherwise it will cause deviation of measurement results.Adequate lubrication of SKF combined bearing, correct use and common faults
The inspection of bearings is completed immediately after delivery or rust counting. During the whole inspection process, try not to last too long to cause corrosion. Pay attention to the use of clean and oil-free pure gasoline, which can also cause corrosion.Adequate lubrication of SKF combined bearing, correct use and common faults

The influence of grinding quality on the premature failure of SKF Bearing can be judged from the above test results. The grinding crack and grinding burn on one side of the raceway are a direct cause of the collapse of the ferrule and the premature failure of the bearing.
The macro morphology of the crack and the distribution characteristics of grinding burn revealed in this example show that the original position of the raceway is too deviated or the R of the raceway is not round, which increases the grinding allowance on one side of the raceway. When the feed in the coarse grinding stage is large When the grinding speed is fast, the whole raceway produces uneven grinding.
If the grinding wheel is not trimmed in time, it will promote the embedding or adhesion of grinding debris, resulting in the blockage and passivation of the grinding wheel pores, which will increase the imbalance of the grinding wheel, aggravate the spindle vibration, and even the grinding chatter caused by the vibration of the machine tool. Obviously, the grinding force changes periodically, forming intermittent burn strips.
In order to further understand the hardness distribution of ferrule and the microstructure characteristics of quenching and tempering microstructure and surface layer, the partially cracked inner ring and its fragments are selected, the macro hardness is set on the end face, and the longitudinal metallographic samples are intercepted near the crack by wire cutting method.
Cage noise mainly occurs in ball bearings and tapered roller bearings, When the bearing rotates, it will make a sound due to the vibration of the cage and the impact between the cage and the rolling element. This sound is periodic. Chatter (various bearings) is a sound with a certain frequency, which is generated by the vibration caused by large waviness on the raceway surface. Noise caused by improper use: it exists for all kinds of bearings. When the surface of the bearing raceway or rolling element is damaged, dented and rusted, Then there will be periodic noise and vibration Dirt noise will be generated when dust invades the bearing during operation This noise is aperiodic and also accompanied by vibration. Its sound size is not fixed, sometimes not