Thursday, August 16, 2012
Brief tips to extend bearing life
The mobile bearing use in harsh environments, the bearing ring and the sealing cover is essential, because they prevent dirt intrusion, extending bearing life. Roll in the mill usually consists of four sealed tapered roller bearings support. Required to withstand a strong impact load, water and debris intrusion.angular bearing
Japan, NSK has developed ultra-easy to seal a clean roll neck bearings. These bearings under severe lubrication conditions, the load capacity increased by 34%, and high reliability, long life, easy to maintain. This performance improvement is to optimize the mechanical design, using the results of new materials and patented sealing technology. Compared with the traditional roll neck bearings, the seal roll neck bearings not only basic dynamic load rating improved 34 percent, and life expectancy by 2.7 times.
The second factor is the performance of ultra-capacity sealed clean roll neck bearings NSK has developed the Super-TF bearing steel. This material to solve the bearing life under contaminated or insufficient lubrication conditions. Experience has shown that, in the pollution of operating conditions, bearings vulnerable to debris intrusion and pollution. NSK s research shows that the pollution or marginal lubrication conditions, the bearing life can improve through the improvement of bearing steel microstructure. The new seal structure of the main seal and the hole sealed.
The negative pressure generated in the bearing can be caused by water intrusion from the main sealing hole sealing structure has a great influence on the negative pressure. Therefore, to reduce the negative pressure in the bearing is to prevent water from entering the basic requirements. The most effective way is to make the hole to seal does not directly in contact with water, while retaining hole sealed original function – to prevent the intrusion of water and dirt from the side of the roll neck. Sealing method using surface contact instead of line contact, whether it is running the process, or static process, the surface of contact hole sealed-tight and good. Therefore, the new super-capacity sealed clean roll neck bearings with higher reliability than traditional sealed roll neck bearings.
In addition, SKF Italy seal recently developed a new generation of oil and grease seals MudBlock. Optimize the design of the seal structure can effectively prevent the intrusion of dirt. Sealing structure for a radial sealing lip, outer diameter and seat between a clamping spring and fixed ring. The new structure there is a push baffle between the bushings and seals, and seals the outer surface of the bushing inner diameter rubber inner lip with a waterproof grease pre-lubrication. According to operating conditions and application requirements, MudBlock available a variety of flexible material. These materials include: nitrile, polyacrylic acid resin, fluorinated synthetic rubber.