Thrust bearings and installation information used on rolls

Nov 06, 2023

The thrust bearings used on the rolls can vary according to different rolling mill types and specifications, and the following types of thrust bearings are usually used:

Cylindrical roller thrust bearing: This type mainly consists of cylindrical rollers, cages, and inner and outer rings. It is suitable for rolling mills with high radial and axial loads. The advantages of cylindrical roller thrust bearings are load-bearing solid capacity, high rigidity, and good impact resistance, but they require higher installation accuracy and maintenance requirements.

Different rolling mill types require different types of cylindrical roller thrust bearings. For example, the models of cylindrical roller thrust bearings used in two-high rolling mills are usually 69 series, 80 series, etc. In comparison, the models of cylindrical roller thrust bearings used in four-high rolling mills are generally 160 series, 180 series, etc.

Spherical roller thrust bearing: This type mainly consists of spherical rollers, cages, and inner and outer rings. It can automatically adjust the axis position and is suitable for rolling mills that bear large loads and axis deviations. The advantages of spherical roller thrust bearings are strong load-bearing capacity and strong adaptability, but they require higher installation accuracy and maintenance requirements.

The spherical roller thrust bearings commonly used on rolls are the 22340 series.

Thrust ball bearing: This type mainly consists of steel balls, cages, and inner and outer rings. It can withstand axial load and is suitable for high-speed, light-load rolling mills. The advantages of thrust ball bearings are fast rotation speed, low friction resistance, and long service life, but they require higher maintenance.

The models of thrust ball bearings used on rolls include 51100 series bearings and 29200 series bearings.

Among them, the 51100 series bearings are mainly used in rolling mill thrust transmission systems. It is a one-way thrust ball bearing with an inner diameter of 10 mm to 360 mm and is suitable for high-speed, light-load applications. This bearing uses a fiberglass-reinforced polyamide cage and an optimized contour design for excellent impact resistance and reliability.

In addition, the 29200 series bearing is a bidirectional thrust ball bearing with an inner diameter ranging from 10 mm to 440 mm. It can withstand large radial and thrust loads and has high precision and rigidity.

Thrust sliding bearings: Thrust sliding bearings used on rollers include many types, such as ordinary sliding bearings, thin-walled bearing bushes, and thick-walled bearing bushes. These bearings carry the load through surface contact and have the characteristics of higher load-bearing capacity, fewer parts, and more precise manufacturing. Among them, open sliding bearings are more common among sliding bearings. They are characterized by high load-bearing degrees and are suitable for heavy-load, low-speed rolling mills.

When using thrust sliding bearings on rolls, you need to pay attention to the following points:

Installation and maintenance: the sliding bearings installation and maintenance require specialized tools and expertise. Before installation, the size, material, manufacturing process, etc., of the rolling bearings need to be inspected to ensure that they meet the requirements. During installation, the clearance of the bearings needs to be adjusted, and an appropriate amount of lubricant added to reduce friction and wear.

Lubrication: Lubrication of sliding bearings is essential, which can reduce friction and wear and increase the service life of the rolling bearings. It is necessary to select the appropriate lubricant according to the usage requirements of the rolling bearings, check the lubrication condition regularly, and replenish or replace the oil in time.

Monitoring and maintenance: Sliding bearings must regularly monitor their operating status during use, including temperature, vibration, noise, and other parameters. If an abnormality is discovered, it must be shut down immediately for inspection and repair to avoid causing more significant damage.

When selecting the thrust bearing on the roll, comprehensive considerations need to be made based on factors such as the type, specifications, load conditions, and usage requirements of the rolling mill. At the same time, you need to pay attention to the following points:

The size and type of the thrust bearing should match the size and style of the roll to ensure the reliability of its installation and use.

The materials and manufacturing process of thrust bearings should meet the requirements to ensure that their performance and quality meet standards.

The use and maintenance of thrust bearings should follow the instructions or operating manual to ensure regular operation and service life.

Thrust bearings should be inspected and maintained regularly during installation and used to detect and deal with problems promptly to prevent failure or damage.

In short, the thrust bearing used on the roll needs to be selected according to different rolling mill types and specifications, and the purchaser should pay attention to its size, material, manufacturing process, use and maintenance, etc. Only in this way can the stable operation of the rolling mill and improved production efficiency be ensured.