ial direction; usually, multiple scratches are distributed according to the roller spacing.

Cause: after installation, the inner and outer rings of the bearing are not coaxial.

Measures: use appropriate installation tools; avoid centering; if possible, rotate the bearing during installation.

Typical failure of rolling mill bearing 9. Friction corrosion

Phenomenon: there are dark brown spots and residues on the mating surface; the mounting surface is worn; the running noise may be increased; the rotating parts may be broken.

Cause: when the fit is too loose, micro relative motion occurs between the fitting parts; the shaft or bearing seat is deflected; the shape deviation of the shaft and / or bearing seat hole is too large.

Measures: observe the fit tolerance of the bearing at the factory; apply appropriate lubricant on the back of the bearing.

 

Typical failure fault of rolling mill bearing 10. Axial fracture of bearing ring

Phenomenon: the ferrule is axially broken; the smooth fracture edge indicates that the fracture occurs during the operation of the bearing; the sharp fracture edge indicates that the fracture occurs during the disassembly of the bearing.

Causes: the inner ring rotates on the shaft; improper lubrication; too tight or uneven fit with the shaft; bearing ring and other parts; external thermal stress.

Measures: improve lubrication quality; select more suitable matching; use bearings with carbon infiltrated steel rings; avoid grinding with surrounding components.