Rolling is a process of continuous three-point bending of sheet metal by rolling machine. The plate rolling machine will place the plate between the upper and lower work rolls when rolling. The upper roll rises and falls vertically, and the two lower rolls rotate and move horizontally with respect to the axial plane of the upper roll. When the upper roll descends, the plate is bent due to plastic deformation between the upper and lower work rolls. The continuous rotation of the lower roll drives the steel plate forward and backward through the friction between the plate and the roll to complete the coiling.

The bending machine is suitable for the bending deformation of metal plates. It can roll round, arc and cone workpieces within a certain range, and has the function of pre bending the end of plates. The types of plate rolling machines are different due to different fields of use. The bending machine is divided into three roll bending machine and four roll bending machine according to the number of rolls. The metal sheet can be rolled into a round, arc or tapered workpiece within a certain range.

The development of science and technology and the continuous learning and introduction of rolling technology at home and abroad by enterprises have greatly improved the production technology of rolling equipment. In recent years, the three roll horizontal down coiler and four roll coiler produced in China have increasingly replaced the traditional coiler!