As the core component of rolling mill, the life of rolling mill bearing directly affects the operating cost and efficiency of the equipment. This paper discusses the main factors affecting the life of rolling mill bearing, and puts forward the corresponding improvement measures to extend the service life of the bearing.
Key words: rolling mill bearing; Extended life span; Maintenance strategy
Rolling mill bearing is an important part of supporting roll and bearing rolling force, which is very important to ensure the normal operation of rolling mill. However, due to the harsh working environment, bearings are prone to early failure, such as raceway spalling, wear and corrosion, which brings economic losses to enterprises. In order to improve the durability of bearings, the combined influence of various internal and external factors must be considered.
1. Factors affecting bearing life
Internal factors: including bearing material selection, structural design and machining accuracy. These intrinsic characteristics determine the basic performance and reliability of bearings.
External factors: cover working conditions such as speed, load, lubrication and cooling effect. In addition, installation accuracy and sealing quality also have an important impact on external factors.
Statistics show that more than 70% of rolling mill bearing failures in China are abnormal, which suggests that we need to study the specific causes of these problems more deeply and take effective preventive measures
Methods to improve bearing life
Optimized seal design: Since mill bearings are often exposed to contaminants, a good seal prevents cooling water and iron oxide from entering the bearing, thereby reducing the risk of material fatigue and wear. It is recommended to use waterproof rubber pads and fluororubber framework sealing rings to strengthen the sealing effect.
Choose the right lubricant: Proper lubrication can significantly reduce friction and remove heat. In order to ensure the effective distribution of grease, it is recommended to improve the position of the oil injection port so that the grease can evenly cover the bearing surface to avoid problems caused by insufficient lubrication.
Precise installation process: The correct installation method is critical to ensure the long-term stable operation of the bearing. For example, when installing four rows of cylindrical bearings, ensure that the inner and outer end caps are properly positioned and in close contact with the outer ring of the bearing, and use the worm adjusting positioning ring to secure the bearing position and ensure that all clearances are up to standard.
