Lamination (rolling) is a technological operation of cold deformation (without heating) of sheet material along a certain direction. Practically, lamination is carried out on special equipment – rollers, with the help of which both finished products and precision workpieces are obtained.

roller, the sheet material is rolled between strong shafts and bent to the required radius, called the bending radius.

To deform the sheet, a 3-roll design of the rollers is sufficient. They have a simple design, however, the operation of running them is associated with the following technological difficulties:

straight sections remain along the edges of the sheet, which leads to an additional calibration operation after welding the workpiece into the housing,
it is often necessary to turn and reload the sheet, which negatively affects the accuracy of the workpiece.
These shortcomings are devoid of 4-rollers, which are considered the most versatile, accurate and easy to operate. In such rollers, the sheet material is clamped between the upper and lower rollers, and the deformation (bending) is carried out by side bending rollers. On 4-roller rolls, the hem of the leading and trailing edges is made in one pass.