When SKF bearings pressed into large oval holes in the shell or two separate case when you tighten, displacing the bearing outer ring oval in the short axis clearance significantly reduced even negative clearance. Bearings under load action, have a week to turn in signs of peeling, outer ring only on the short axis of the symmetrical position falling off signs, which is the main reason for early failure of the bearing. On the failure of the bearings inspection showed that the SKF bearing outer diameter circle from the original 0.8 μ m to 27 μ m for process control, this value is much larger than the radial clearance values.
　　Therefore, it is certain that the SKF bearing is severely deformed and-clearance work, faces early exceptions on the rapid wear and spalling, ′s response is to improve accuracy or shell holes as much as possible in the shell-hole two separated structures. Raceways inclined flaking spalling in bearing face is tilted on ring belt, description of bearings under tilted work, when when the slope angle reaches or exceeds a critical state, early rapid wear of abnormal formation and easy to peel. Formation is largely the result of poor installation, shaft deflection, the precision axle journal and the shell holes and low, take countermeasures to ensure that SKF bearing mounting hole quality improve shoulder, shoulder axial runout accuracy.
　　a． Cage of abnormal loads. As installed does not in place, and tilt, and had Ying volume had large, easy caused tour gap reduced, increased friction health hot, surface softened, premature appears exception peeling, as peeling of extended, peeling foreign body entered maintained frame Pocket Hole in the, led to maintained frame running block and produced attached load, increased has maintained frame of wear, so deteriorated of cycle role, will may caused maintained frame fracture.
　　b． Running in the lean-oil State of poor lubrication mainly refer to SKF bearing, easy to form adhere abrasion, which enables the surface deterioration, adhere abrasion of tearing into the cage, causes the cage to produce abnormal load, likely to contribute to cage fracture.
　　c． The intrusion of foreign bodies from is a common pattern of cage fracture. External hard foreign body penetration of retainer wear with the exception of additional load, may also cause the cage fracture.
　　d． Creep phenomena also contributed to the fracture of cage contributed. What is creep phenomena of sliding rings, in mating surfaces have an interference fit enough of the case, the loading point to move around due to sliding, direction ring relative to the circular shaft or housing location deviation phenomena. Creep, if it happens, combined with significant wear, wear powder are likely to enter the SKF bearing, forming abnormal wear-peeling-the-cage-rolling road wear and additional load process, and may result in fracture of cage.
　　e． Cage material defects (for example, large blocks of different metal inclusions and shrinkage cracks, bubbles) and riveting defects (short nails or nails, pad in half cage joint gap, severe riveting injury) are possible, such as cage fracture. Taking measures to impose strict control during the manufacturing process.