Walking outside Since the fit of the housing aperture t […]
Since the fit of the housing aperture to the outer diameter of the bearing is too loose, there is a slip between their surfaces. Sliding friction will cause heat to cause the bearing to heat up and be damaged.
Sliding trace between the housing aperture and the bearing outer diameter surface
Hammer hits the bearing directly
Install the bearing with the inner ring (or outer ring) with interference fit. It is forbidden to directly hit the end surface of the inner ring (or outer ring) of the bearing with a hammer, so that it is easy to knock the rib. The sleeve should be placed on the end face of the inner ring (or outer ring) and tapped with a hammer to install.
Heating temperature is too high
Some users use an acetylene spray gun to heat the inner bore of the bearing. When the heating temperature exceeds 727 ° C (the phase transition temperature of the bearing steel), the metallographic structure inside the bearing steel will change. When the bearing is cooled, the bearing bore cannot be restored to its original size, usually larger than the size before heating.
Bearing heated by acetylene spray gun, the surface turns black