A.      Dynamic load.

Dynamic load is the main factor affecting bearing life, backup roller bearings in the design selection process is based on the rolling force.

Power system as determined by an imbalance in the process of rolling, vibration, shock loads caused by the normal load of 3 times, when the card is steel,

cold rolled steel, roll into the foreign body in times such as would give rise to several times the impact, so to regulate the operation of rolling scraping,

steel to prevent card phenomenon and avoid early fatigue damage to the bearings. Currently the mill is under hydraulic overload protection with,

To avoid a big impact generated.

B, the bearing material

The chemical composition of bearing materials, smelting method, heat treatment methods, the impact on bearing life is critical, backup roller bearing

because of its working conditions influence on the bearing manufacturing has special requirements, we together with the manufacturers of the bearing material, hard

degrees have specific requirements, while ensuring the bearing stiffness, hardness not less than HRC58-64.

C, operating temperature

Bearing operating temperature is generally required less than 1200C, if the working temperature exceeds 1200C, the roller and raceway temperature is higher (about

Up to 1500C) will exceed the tempering temperature used bearings, the bearing stiffness, dimensional accuracy greatly reduce grease failure, therefore,

we reduce the cooling water temperature at the same time, contact the manufacturer to improve the bearing material of tempering temperature.

D, installation, seal

The installation of the bearing life of great influence on the bearing installation requirements concentricity good sealing device sufficient to prevent dust, particles

and the intrusion of moisture, work appropriate to adjust the radial clearance, clearance is too small, the bearing friction and temperature, roll surface burns,

clearance is too large, bearing vibration, inertia, severe impact, noise, and reduced life.

E, lubrication

Select the appropriate grease, grease the amount to be appropriate, will result in poor lubrication of bearings early damage, reasonable lubrication

reduce the friction heat, to avoid excessive temperature rise, reducing wear and preventing corrosion, increased sealed roller bearing support 24 hours

operation, no way to add oil, poor working conditions, wet, dusty, impact load, the use of lithium grease, can better
solve these issues.

The proper use of backup roll bearings, to improve the board production, reduce costs is of great significance, we try to do the bearing

installation, lubrication, maintenance, service life of the bearing can be our master, in order to do regularly, to avoid bearing the early

term damage, eliminate the occurrence of incidents, and ultimately in the operation of the bearing fatigue spalling and wear is inevitable, we

want to have a new generation of better rolling bearings can be replaced, to the use of long-life bearings.



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