The rolling mill is an equipment that implements the metal rolling process, and the roughing stand is an important part of the rolling mill. In the rolling mill system, the working stand includes various components such as the rolling mill stand, adjusting device, and bearing seat, and the stand is an important load-bearing component of the rolling mill. The rough rolling stand specifically refers to the stand used to withstand all the rolling forces exerted by the rolled metal on the rolls during the rolling process. This kind of frame needs to withstand a lot of pressure and moment, so it has high requirements for its strength and stiffness.
The rough rolling stand is an important part of the rolling mill. Its working principle is to withstand all the rolling forces exerted by the rolled metal on the rolls during the rolling process and transfer these forces to the foundation of the rolling mill, thereby ensuring The stable operation of the rolling mill and the quality of the rolled products.
During the rough rolling process, the metal blank undergoes multiple reversible rollings to gradually achieve thickness reduction and preliminary shape adjustment. The rough rolling stand controls the rolling pressure and rolling speed of the metal by adjusting the gap and reduction of the rolls, thereby rolling the metal billet. In this process, the rough rolling stand needs to withstand large rolling forces and moments, so there are high requirements for its strength and stiffness.
The rough rolling stand usually consists of the stand body, roll chock, pressing device, transmission device, and other parts. The standing body is the main structure of the rough rolling stand. It is usually made of cast steel or welded steel structure and has sufficient strength and stiffness to withstand various forces during the rolling process. The roll chock is used to install the roll and supports the rotation of the roll through the bearings in the chock. The reduction device is used to adjust the gap reduction amount of the rolls and control the rolling pressure and rolling speed. The transmission device is used to drive the rotation of the roller to realize the metal rolling process.
Specifically, the stress situation of the rough rolling stand during operation is complex, including the rolling force, the horizontal force on the column caused by the difference in tension between the front and rear strips, the additional force of the roll balancing device on the upper and lower beams of the stand, and various horizontal forces. The resulting overturning moment is the reaction force on the supporting surface under the frame, etc. During the rolling process, the roughing stand needs to withstand these forces and ensure stable operation and the quality of the rolled products.
Therefore, the design and manufacturing of the roughing mill frame need to take into account factors such as its ability to withstand force, stiffness, and stability to ensure the normal operation of the rolling mill and the quality of the product.
The rough rolling stand is usually used in the preliminary stage of rolling, that is, the rough rolling stage. At this stage, the metal billet undergoes multiple reversible rolling mills to meet the requirements of finish rolling by controlling the plate shape and thickness. The rough rolling stand usually has only one rolling mill, which achieves recrystallization and refinement of grains through large reduction, while effectively controlling central defects. In this process, the rolling force is large, which requires high strength and stiffness of the frame.
The finishing rolling stand is used in the later stage of rolling, that is, the finishing rolling stage. At this stage, the thickness and performance requirements of the metal material are met through rapid rolling. The finishing rolling stand usually has seven rolling stands, which achieve precise rolling of metal through multi-pass rolling. At this stage, the rolling force is relatively small, but the requirements for rolling accuracy and product quality are higher.
In general, the roles and requirements of rough rolling stands and finishing rolling stands in the rolling process are different. The rough rolling stand mainly focuses on achieving preliminary rolling of metal and defect control. While the finishing rolling stand focuses more on achieving precise rolling of metal and product quality control.
The roughing stand plays an important role in the rolling mill and bears huge pressure and torque. So, the requirements for its materials are very strict. Usually, we manufacture it using materials with high strength, high wear resistance, good casting performance, welding performance, and processing performance.
Common roughing mill frame manufacturing materials include ordinary carbon structural steels such as Q235 and Q345. These materials have good weldability and processability and are relatively affordable. In addition, ductile iron is also a commonly used material for manufacturing rough rolling stands. It has high strength, high wear resistance, and good stability. Thus, it can meet the requirements for strength and stiffness of rough rolling stands.
The material selection of the rough rolling stand also needs to take into account factors such as the specific working conditions of the rolling mill, and the type and quality requirements of the rolled products. Therefore, in practical applications, it is necessary to select appropriate materials to manufacture rough rolling stands according to specific conditions to ensure the stable operation of the rolling mill and the quality of rolled products.
The design and manufacturing of the roughing stand frame need to take into account many factors. For example, the ability to withstand force, stiffness, and stability. Only in this way, can we ensure the normal operation of the rolling mill and the quality of the product.
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