Too high a residual magnetism causes various damage in needle roller bearings, spherical roller bearings, axial grooved ball bearings, tapered roller bearings and swivel joint roller bearings:
Magnetic adhesion of metallic particles causes damage to the running surfaces, not only during assembly. Magnetic cleanliness is also important for preventing particle contamination.
Residual magnetism on the rotating parts causes eddy currents and therefore results in the bearing running surfaces eroding (especially on large bearings); premature failures are the result.
For these purposes, Maurer Magnetic offers specially developed machines to demagnetise individual bearing parts and for completely assembled bearings.
Rolling bodies, balls
These parts are normally subjected to an eddy current crack test. The latest methods also detect overheating when grinding as well as cracks. These extremely sensitive tests require highly homogeneous demagnetisation in order to eliminate incorrect measurements.
Magnetic clamping fixtures such as magnetic clamping plates introduce magnetism into bearing rings. Hardening the rings also causes magnetism. This magnetism also contributes to magnetic contamination and must be eliminated. Maurer Magnetic has demagnetisation equipment with unique features, which causes deep and homogeneous demagnetisation.
Assembled rolling bearings
Assembled rolling bearings and ball bearings can also be demagnetised. This treatment requires the highest process control precision; treatment in a room that is free of magnetic fields is essential,
in order to prevent selective strong magnetic points on the rolling body surface.
Maurer Magnetic manages these processes thanks to unique features, as a result of patented processes and shielding measures.