The difference between rough rolling and finish rolling in the field of rolling mill bearings

Mar 27, 2024

Rough rolling and finish rolling in rolling mill bearings are two important stages in the metal processing process. They have significant differences in rolling technology, rolling mill equipment, rolling effects, etc. The differences between rough rolling and finish rolling in rolling mill bearings will be discussed in detail below.

First of all, from the perspective of the rolling process, the goals and requirements of rough rolling and finishing rolling are completely different. Rough rolling mainly focuses on passing the original steel ingot or continuous casting billet through a series of rolling passes to reduce its thickness gradually and initially form the desired cross-section shape. During this process, the steel material is gradually plastically deformed after multiple passes of rolling, and the internal crystal structure gradually changes to achieve the required mechanical properties and shape requirements. The rough rolling process has the characteristics of high efficiency and low cost, and can quickly process the original billet into steel materials of required specifications. Finish rolling focuses more on precise control of the shape, size, and properties of metal materials. By controlling process parameters such as rolling temperature, rolling speed, and rolling passes, finish rolling can achieve fine processing of metal materials to meet higher quality requirements.

Secondly, from the perspective of rolling mill equipment, the rolling mill types and equipment configurations used for rough rolling and finishing rolling are also different. Roughing mills usually have larger roll diameters and lower rolling speeds to provide larger rolling forces and higher rolling pressures. This design allows the roughing mill to cope with the larger size and higher hardness of the original billet, enabling efficient rolling. Finishing mills usually have smaller roll diameters and higher rolling speeds to provide smaller rolling forces and lower rolling pressures. This design helps achieve fine processing of metal materials and achieve higher surface quality and accuracy.

In addition, there are obvious differences in rolling effects between rough rolling and finish rolling. During the rough rolling process, due to the large rolling force and rolling pressure, large deformation resistance will be generated, which helps to refine the grains and benefits the mechanical properties of the material. However, rough-rolled steel often requires further processing to meet final requirements. Finish rolling can achieve precise control of metal materials and obtain higher dimensional accuracy and surface quality. Finish-rolled steel generally has better mechanical properties and a wider range of applications.

In the field of rolling mill bearings, the difference between rough rolling and finish rolling is also reflected in the impact on bearing performance. During the rough rolling process, the bearings are subject to large rolling forces and impact forces, which are prone to wear and deformation. Therefore, roughing mill bearings need to have high load-bearing capacity and wear resistance. During the finishing rolling process, the rolling force and impact force on the bearing are relatively small, but the requirements for precision and stability are higher. Therefore, finishing mill bearings need to have higher precision and more stable performance.

To sum up, there are significant differences between rough rolling and finish rolling in the field of rolling mill bearings in terms of rolling process, rolling mill equipment, rolling effect, and impact on bearing performance. These differences make rough rolling and finish rolling each play an indispensable role in the metal processing process. Through reasonable selection and application of rough rolling and finishing rolling processes, efficient and high-quality processing of metal materials can be achieved to meet various complex and delicate rolling needs. At the same time, it is also necessary to select suitable rolling mill bearing types and specifications based on the characteristics and requirements of rough rolling and finishing rolling to ensure the stable operation of the rolling mill and the long-term stable performance of the bearings.