One of the reasons for the damage to the four-row tapered bearing of the rolling mill is eccentric loading.

Sep 13, 2024

As a key part of the rolling mill equipment, the operating status of the four-row tapered bearing of the rolling mill directly affects the efficiency and stability of the whole production line. However, in actual use, the damage of the four-row tapered bearing occurs from time to time, among which eccentric loading is one of the important reasons for its damage. Today, this article will describe in detail the definition, influence, cause and preventive measures of eccentric loading.

1. Definition and influence of eccentric loading.

Eccentric loading, as the name suggests, refers to the phenomenon that the bearing is subjected to uneven force in each row or part when it is under load. In four-row tapered bearings, the eccentric loading phenomenon is particularly prominent. Due to the complexity of the rolling process and equipment, the rolling mill often generates various dynamic loads during operation. If these loads are unevenly distributed, some parts of the bearing will be subjected to excessive pressure, thereby accelerating the wear and damage of the bearing.

The influence of eccentric loading on four-row tapered bearings is mainly affected by the following aspects:

Accelerated wear: Uneven force will cause some parts of the bearing to wear more severely and reduce the service life of the bearing.

Generate vibration and noise: Offset load will make the operation of the bearing unstable, generate vibration and noise, and affect the normal operation of the equipment.

Reduced precision: The offset load of the bearing will cause the precision of the rolling mill to decrease, affecting the quality of the product.

Increased maintenance costs: Frequent bearing damage will increase maintenance costs and production interruption time, and reduce production efficiency.

2. Analysis of the causes of offset load.

Unreasonable rolling process: Unreasonable design of the rolling process, such as uneven distribution of rolling force, large fluctuations in rolling speed, etc., will cause the bearing to bear offset load.

Low equipment installation accuracy: The installation accuracy of the rolling mill directly affects the force of the bearing. Suppose there are errors during the installation process, such as poor alignment between the bearing seat and the roller, improper adjustment of the bearing clearance, etc. In that case, it will prevent the bearing from being offset.

Bearing quality problems: The manufacturing quality of the bearing will also affect its force. If the bearing has low precision, poor rigidity or internal defects, it is easy to be damaged when the force is uneven.

Friction between the roller and the bearing seat: The friction between the roller and the bearing seat will also cause uneven force on the bearing. For example, when the roller enters the bearing seat, the ball rubs against the inner sleeve, scratching the inner sleeve, making the roller inflexible during operation, thereby causing the bearing to be unbalanced.

3. Measures to prevent unbalanced loading.

• Optimize the rolling process:

• By optimizing the rolling process, the rolling force is reasonably distributed.

• The impact of dynamic load on the bearing is reduced.

• The risk of unbalanced loading of the bearing is reduced.

Improve the installation accuracy of the equipment: During the installation of the equipment, the installation accuracy should be strictly controlled to ensure that the bearing seat and the roller are well aligned and the bearing clearance is reasonably adjusted. At the same time, strengthen the daily maintenance and inspection of the equipment to discover and deal with potential problems promptly.

Select high-quality bearings: When purchasing bearings, products with reliable quality and high precision should be selected. At the same time, the bearings should be inspected and replaced regularly to ensure that the performance of the bearings is stable and reliable.

Improve lubrication conditions: Good lubrication conditions can reduce the friction and wear of the bearings and reduce the risk of unbalanced loading. Therefore, suitable grease should be selected and replaced regularly to ensure the stable operation of the lubrication system.

Strengthen fault diagnosis and prevention: Use modern fault diagnosis technology to monitor and diagnose the operating status of the bearing in real-time. Once the bearing is found to have an off-center load risk or other abnormal problems, timely measures should be taken to handle and repair it.

In summary, off-center load is one of the important reasons for the damage to the four-row tapered bearing of the rolling mill. In order to reduce the damage rate of the bearing and improve the efficiency and stability of the production line, we need to take effective measures from the aspects of optimizing the rolling process, improving the installation accuracy of the equipment, selecting high-quality bearings, improving lubrication conditions, and strengthening fault diagnosis and prevention. Through the implementation of these measures, we can significantly reduce the risk of off-center load of the bearing and extend its service life.