For bearing clearance and rolling material issues

Effective clearance or clearance work is called rolling installed in the host after a certain load, up to a certain temperature stable operation mode, scroll
The actual presence of the bearing clearance. Obviously, the effective clearance smaller than the clearance work. The original rolling bearing clearance is complete after installation in front of the machine,
Located in a free state clearance. In fact the original clearance by measuring it is difficult not learned. So that the original clearance clearance inspection is often used instead.

  roll bearings and rolling elements typically use high carbon chromium bearing steel. Most of the bearing steel in the JIS SUJ2. Large bearings SUJ3. SUJ2 of
Chemical composition, in the world, as the imported bearings material has been normalized. For example: With AISL52100 (United States), DIN100Cr6 (Germany),
BS535A99 (UK), etc. are the same kinds of steel.

  Rolling bearing rings and rolling elements, side repeatedly withstand high contact pressure, sliding along one side of the rolling contact. Retainer rings and roll with one side
Moving body on both sides, or one side sliding contact side under tension and compression forces. Therefore, the bearing rings, rolling elements and cage materials, performance,
Main requirements imports bearing rings, rolling material required performance: rolling fatigue strength, high hardness, high wear resistance.