Working principle of cold rolling mill

The working principle of the cold rolling mill is to use the ring hole shape to cold roll the rough pipe, through the variable section rolling groove and the conical mandrel, relying on the reciprocating motion of the machine base, periodically rolling the rough pipe section by section.

The main working principles of the cold rolling mill can be summarized as follows:

Variable-section groove and conical mandrel: The cold rolling mill uses variable-section groove and conical mandrel. The design of these components allows the gap between the hole type and the tube body to change periodically during the rolling process, thereby reducing the outer diameter and wall thickness of the tube.
‌Reciprocating motion of the machine frame: The working frame reciprocates through the crank connecting rod mechanism. This reciprocating motion causes the gap between the roller and the tube blank to increase and decrease periodically, thereby completing the rolling process.
‌Periodic segment rolling: The cold rolling mill periodically rolls the rough tube segment by segment, and each rolling will reduce the outer diameter and wall thickness of the tube until the required size and accuracy are achieved.
‌Feeding and rotation: During the rolling process, the tube blank is fed in a certain length through the feeding mechanism and is rolled in contact with the roller during rotation. This combination of feeding and rotation enables the tube to reach the required shape and size during the continuous deformation process.

These working principles of the cold rolling mill enable it to efficiently produce seamless steel pipes with high precision and good surface roughness, which are widely used in various fields such as metallurgy, machinery, automobiles, petroleum, and chemical industry.