What are the models of tube mill bearings?

Jul 29, 2024

Tube mill bearings have various models to meet the needs of different rolling mill equipment and working conditions. The following is a detailed introduction to the models of tube mill bearings.

1. Classification of tube mill bearings

Tube mill bearings can be divided into many types according to their structure and uses. Among them, cylindrical roller bearings, tapered roller bearings, thrust roller bearings, etc., are commonly used bearing types in tube mills. These bearing types have their characteristics in terms of load, speed, working environment, etc., and are suitable for different rolling mill equipment and process requirements.

2. Tube mill bearing models

Cylindrical roller bearings

Cylindrical roller bearings are one of the commonly used bearing types in tube mills. It has a simple structure and strong load-bearing capacity and is suitable for bearing radial loads and certain axial loads. Common cylindrical roller bearing models include NJ, NU, NUP, NN, NNU, etc. These models are slightly different in size, structure, performance, etc., and can be selected according to specific needs.

(1) NJ cylindrical roller bearing: NJ bearing has the structural feature of an inner ring with a flange, which is suitable for bearing radial load and certain axial load. Its model range is wide, such as NJ202-NJ220, NJ305-NJ320, NJ405-NJ430, etc., which can be selected according to the size and load requirements of rolling mill equipment.

The above picture is the single-row cylindrical roller bearing NJ212 produced by FV.

(2) NU cylindrical roller bearing: NU bearing has no flange on the inner ring and flange on the outer ring, which is suitable for occasions that only bear radial load. Its models include NU202-NU220, NU305-NU320, NU405-NU430, etc., which can also be chosen according to actual needs.

(3) NUP cylindrical roller bearing: NUP bearing is based on NU bearing and adds a guide flange on the inner ring so that the bearing can bear a certain axial load. Its models, such as NUP202-NUP220, NUP305-NUP320, NUP405-NUP430, etc., are suitable for rolling mill equipment with certain requirements for axial load.

(4) NN and NNU double-row cylindrical roller bearings: NN and NNU bearings are double-row cylindrical roller bearings with higher load-bearing capacity and stiffness. Among them, the NN bearing has no flanges on the inner and outer rings, which is suitable for occasions that only bear radial loads. In contrast, the NNU bearing has no flanges on the inner ring and flanges on the outer ring, which can bear certain axial loads. Its models, such as NN3005-NN3030, NNU4920-NNU4944, etc., are suitable for large rolling mill equipment.

Tapered roller bearings

The characteristic of tapered roller bearings is that they can bear radial loads and axial loads at the same time, which is especially suitable for occasions that bear large axial loads. The tapered roller bearings commonly used in pipe rolling mills include single-row tapered roller bearings and double-row tapered roller bearings. The structure of single-row tapered roller bearings is relatively simple, while double-row tapered roller bearings are more excellent in supporting rigidity and balance. When choosing, the type of tapered roller bearing to be used should be determined according to the actual needs and working conditions of the rolling mill equipment.

The above picture is the double-row tapered roller bearing 323128 produced by FV.

Thrust roller bearing

Thrust roller bearings are mainly used to bear axial loads and are one of the indispensable bearing types in pipe rolling mills. Common thrust roller bearing models include the 51100 series, 29200 series, 29300 series, 29400 series, and 81100 series. These series of bearings have their characteristics in structure, performance, and application scenarios and can be selected according to the specific needs of rolling mill equipment. For example, 51100 series bearings are mainly used in rolling mill thrust transmission systems and are suitable for high-speed and light-load applications. In contrast, 29300 series bearings are suitable for large equipment such as rolling mills under heavy load conditions.

There are many types of pipe rolling mill bearings, and each type has its specific structural characteristics and scope of application. When selecting tube mill bearings, the most suitable bearing model should be selected according to the actual needs and working conditions of the rolling mill equipment. At the same time, during use, attention should be paid to the maintenance and regular inspection of the bearings to ensure their normal operation and extend their service life.