Home>Bearing knowledge>Dissection: FAG bearing damage situation and reason
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Analysis: FAG bearing damage condition and reason

Source: China Bearing Network Time: 2013-01-16

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Peeling damage condition: When the FAG bearing receives the load rotation, the raceway surface or the rolling surface of the inner ring and the outer ring exhibits a fish scale-like peeling appearance due to tumbling fatigue.
Cause: The load is too large. Equipment is poor (non-linear) Torque load Foreign matter intrusion, water ingress. Smoothness, smoothing agent is not suitable for FAG bearing clearance is not appropriate. FAG bearing box accuracy is not good; FAG bearing box rigidity uneven axis The deflection is caused by large rust, corrosion points, abrasions and indentations (external deformation appearance).
Method: Check the size of the load and re-examine the FAG bearing improvement equipment method to improve the sealing equipment, stop the rust prevention. Use the smooth viscosity of the appropriate viscosity, improve the smooth method. View the accuracy of the shaft and FAG bearing box. View the clearance.
Peeling damage condition: showing a dark surface with slight abrasion; there are many small cracks on the dark surface from the outside to the inside with a depth of 5-10m; and a small drop in a large area (small peeling)
Reason: The smoothing agent is not suitable. The foreign matter enters the smoothing agent. The smoothing agent is poorly formed and the appearance is rough. The appearance of the paired tumbling parts is not good.
Method: Select smoothing agent to improve the sealing equipment to improve the appearance of the paired tumbling parts.
Card injury status: The so-called card injury is due to the appearance of some minor burns on the sliding surface injury and the appearance of the external damage. The linear surface of the slide surface and the rolling surface of the rolling surface. The tangential flaw of the roller end surface is close to rolling. The card face of the sub-end face is damaged.
Reasons: excessive load, excessive preloading. Smoothness. Foreign matter bites. The outer ring outer ring is skewed, the axis is deflected. The accuracy of the shaft and FAG bearing box is poor.
Method: Check the size of the load. Preload should be appropriate. Improve the smoothing agent and smooth method. Check the accuracy of the shaft and FAG bearing box.
Cracking damage condition: The so-called cracking refers to a slight cracking due to some slanting or excessive load on the rim or roller angle of the raceway wheel.
Reason: The equipment was shocked. The load was too large.
Method: Improve the equipment method (select hot loading; use the appropriate things folder). Correct the load conditions. FAG bearing equipment is in place; the ribs are supported.
Crack and crack damage: The so-called crack refers to the crack damage of the rolling wheel or the rolling body. If it is used continuously, it will also contain cracks.
Cause: Excessive over-interference. Excessive load; impact load. Peeling is carried out. Because of the heat generated by the touch of the raceway wheel and the components of the equipment and the fretting wear. The heat generated by creep. The cone angle of the cone shaft is poor. The cylindricity of the shaft is poor. The corner radius of the shaft step is larger than the FAG bearing chamfer and forms an interference with the FAG bearing chamfer.
Method: The amount of interference is appropriate. Check the load conditions. Improve the equipment method. The shape of the shaft should be appropriate.
Indentation damage condition: biting into a small metal powder; time of foreign matter; dents on the raceway surface or transition surface. Because the equipment is impacted, etc.; concave surface is formed at the distance of the roll body. Hardness indentation).
Cause: Foreign matter such as metal powder bites into. The impact load during assembly or during transportation is too large.
Method: Impact bushing. Improve sealing equipment. Filter smooth oil. Improve assembly and operation.
Pear-like pitting damage: a weak-gloss dark pear-like pitting on the raceway.
Reason: The foreign body is bitten in the smooth process. Condensation due to moisture in the air. Smooth and poor.
Method: Improve the sealing equipment. Fully filter the smooth oil. Use suitable smoothing agent.
Wear damage condition: the so-called wear is due to the conflict to form the raceway surface or the rolling surface; the roller end surface; the collar surface and the concave surface of the bracket are worn.
Cause: Intrusion of foreign matter; development caused by rust and corrosion. Slippery. Slip due to irregular movement of the roll.
Method: Improve the sealing equipment. Clear the FAG bearing box. Fully filter the smooth oil. Check the smoothing agent and smooth method. Avoid non-linearity.
Micro-vibration wear damage condition: The wear and tear caused by the relatively repeated fine sliding between the two touch surfaces occurs on the raceway surface and the touch of the roll body. Because of the occurrence of reddish brown and black wear powder; therefore, it is also called fretting wear corrosion.
Reason: smooth and poor. Small amplitude shaking motion. Lack of interference.
Method: Use the appropriate smoothing agent. Add pre-press. Check the interference. Apply the smoothing agent to the cooperating surface. The false Brinell indentation damage condition: in the time of the vibration; the touch on the rolling body and the rolling wheel is somewhat due to the oscillation. And the formation of the swaying wear has been carried out; the seizure is similar to the impression of Brinell indentation.
Reason: In the middle of the transportation process, the FAG bearing oscillates and oscillates when it stops. The amplitude is small and the swing motion is poor.
Method: During the transportation process, the bite and the FAG bearing box are fixed. When transporting, the inner ring and the outer ring should be separated and packaged. Preloading is used to reduce the oscillation. Apply proper smoothing agent.
Creep damage condition: The so-called creep refers to the occurrence of a gap in the cooperation surface of the FAG bearing; in the relative seizure slip between the cooperation faces; the cooperating surface of the attack creep exhibits a specular light or a dark surface; sometimes the page carries Card injury wear and tear.
Reason: Lack of interference or gap cooperation. The tightening sleeve is not fast.
Method: Check the interference; perform the rotation stop method. Properly tighten the adapter sleeve. Study the accuracy of the shaft and FAG bearing box. Axial preload. Fasten the side of the raceway wheel. Bond the cooperation surface. Apply to the cooperation surface. ?Slip agent.
Burn injury status: the raceway wheel, the rolling body and the support frame are heated rapidly during the rotation until discoloration, softening, welding and damage.
Reason: Sleek bad. Excessive load (preload is too large). The speed is too large. The clearance is too small. The intrusion of water and foreign matter. The accuracy of the shaft and FAG bearing box is poor, and the deflection of the shaft is large.
Method: Study smoothing agent and smooth method. Correct FAG bearing selection. Discussion cooperation, FAG bearing clearance and preloading. Improve sealing equipment. View the accuracy of shaft and FAG bearing box. Improve equipment method.
Electro-erosion damage condition: The so-called electric erosion refers to the fact that when the FAG bearing race wheel and the roll of the circulating weight transfer have some activity, the spark is declared through a thin smooth oil film, and its appearance shows some ground melting and embossing.
Reason: the potential difference between the outer ring and the inner ring.
Method: When setting the circuit, the current should not flow through the FAG bearing. Insulate the FAG bearing.
Rusting, corrosion damage: FAG bearing rust and corrosion have pit wheels, tumbling rust on the external surface, all rust and corrosion.
Cause: Intrusion of water, corrosive substances (lacquer, gas, etc.). Smoothing agent is not suitable. Because of the condensation of water vapor, water droplets are attached. When the temperature is high and wet, it stops. The transportation process is heavy and rust-proof. The storage condition is not suitable. Not suitable.
Method: Improve the sealing equipment. Discuss the smooth method. Anti-rust method when stopping. Improve the storage method. Pay attention to the application.
Equipment damage condition: An axial line-like flaw formed on the raceway surface and the rolling surface during operation and disassembly.
Reasons: equipment, inner ring, outer ring skewing equipment, impact load when disassembled.
Method: Use the right thing to use the punching machine to avoid the impact load. The equipment is centered on each other.
Discoloration damage condition: due to temperature rise and smoothing agent reverberation, the raceway wheel and the roll body and the shelf are discolored.
Reason: smooth and poor. The reflection with the smoothing agent forms a hot immersion oil. The temperature rises greatly.
Approach: Improve the slick approach.


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