Introduction to the common causes of bearing failure

I. Pollution

Dirt, abrasive, chain links, dust, steel scraps from contaminated work areas, dirty hands or tools, or foreign objects in lubricants or cleaning solutions can cause damage to bearings, dent rolling elements and raceways, resulting in vibration. Lubricants should be filtered and work areas, tools, fixtures and hands cleaned to reduce the risk of contamination.

Second, improper installation

In most cases, bearings should be mounted on the rotating ring by pressure fit, if improperly installed, can lead to bearing depression, wear, ring cracking, high operating temperature, early fatigue and premature failure, and so on.

Three, not aligned

Misalignment is usually caused by shaft bending, shaft shoulder error, gasket error, clamp nut error, or improper installation due to loose fit, improper alignment will lead to overheating and separator failure. The runout of the shoulder and bearing seat of the shaft and bearing seat should be checked and precision lock nuts should be used.

4. Corrosion

Moisture, acid action, poor or broken grease, poor packaging and condensation due to excessive temperature inversion, corrosion can cause wear on the finished surfaces of ball and roller bearings, red or brown stains or deposits on rolling elements, running tracks or cages, increased vibration, followed by wear, increased radial clearance or loss of preload.

Corrosive liquids should be transferred from the bearing area, the use of integral sealing bearings, and the use of external seals in particularly harsh environments should be considered, in addition, if corrosive environments cannot be avoided, the use of appropriate bearing materials (stainless steel) will also be helpful.

Five, lubrication failure

Insufficient lubrication, the use of improper lubricants, a complete lack of lubrication or excessive temperature can degrade the lubricant, discolored rolling elements (blue or brown) and rolling element tracks, overheating or excessive wear of bearings. The appropriate type and amount of lubricant should be used to avoid grease loss and to follow appropriate re-lubrication intervals.

6. Electrical damage (flutter)

Continuous passage of AC or DC current will cause electrical damage, resulting in brown marks on most of the raceway, or covering the entire circumference of the raceway. Current flow through bearings should be prevented by grounding or insulation, or electrically insulated bearings should be used.

7. Fatigue

Overload, preload force is too large, inner ring fit is too tight, bearing operation exceeds its calculated fatigue life. Usually resulting in bearing surface peeling, manifested as a fracture of the running surface, followed by the removal of small discrete material particles from the inner ring, outer ring or rolling element, the peeling is gradual and, once started, will spread with continuous operation. Bearings should be replaced, redesign considered to use bearings with greater calculated fatigue life, internal clearance, and appropriate shaft and housing recommendations obtained.

The hybrid bearing belongs to a kind of plain bearing, which is a plain bearing that works under the state of fluid energy lubrication, and the hybrid bearing can work under hydrostatic lubrication and hydrodynamic lubrication. 

When we use hybrid bearings, we need to pay attention to the following six things to prevent failures during the use of hybrid bearings.

1. After one year of normal use, the 2# spindle oil and coarse filter element should be replaced.

2, the normal use of pump station to replenish oil must be 3 layers of silk cloth filtration.

3, the main shaft pulley, grinding wheel loading and unloading must be carried out in the pumping station working state. That is, the spindle is carried out in the state of hydrostatic oil floating. This does not damage the main shaft and static bearings.

4, before the grinding wheel spindle work, observe whether the pressure of the pump station and the static pressure of the grinding head are within the specification range.

5, when the equipment is stopped, it is necessary to stop the motor of the grinding head first, and then turn off the pump station after the grinding wheel is stopped, otherwise it is easy to damage the grinding head.

6, change any parts on the pump station, be sure to remove the high-pressure oil inlet hose joint first, after replacing the parts, the oil self-circulation 15-20 minutes before the inlet tubing connected to the grinding head, so as to ensure that the spindle oil into the grinding head is ultra-clean spindle oil after fine filtration. This can extend the service life of the static and static spindle

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