At present, the use of rolling mills is quite common, and the performance and operation control of this type of equipment are flexible. It corresponds to a pair of added shafts, movable work rolls, and support rolls between the height of the middle rolls of the rolling mill, and the position of the middle rolls is adjusted to correspond to the two edges. The improved pressure distribution at the corresponding ends of the two mechanisms and the uniformity of the elastic flattening of the work rolls ensure the dimensional accuracy of the belt and reduce defects, Such as thin and cracked edges.

Therefore, the rolling mill is suitable for use as a cold-rolled steel strip. It is a variant of a four height mill, with a working roll diameter of 1/6 of the support roll and relative offset to avoid horizontal bending of the working roll. This is half of the rolling force of a four roll rolling mill, and the good stability of the working roll has a high horizontal stiffness. Its structure and adjustment are much simpler than that of a two roll rolling mill. This rolling mill can be applied to various models, so it is also known as a multi-purpose rolling mill, It has reversible and continuous cold-rolled plates, suitable for cold-rolled silicon steel and non-ferrous metal steel.

It consists of several rolls of work and two pairs of support rollers, with a more stable roll system. However, its stiffness is similar to that of a four layer cold rolling mill, and its operation is inconvenient. Therefore, it is not widely used and is usually used for rolling copper strips from high-precision submarine cables. In a cold rolling mill, the pair of rollers with the smallest diameter is the work roller, while the rest are the support rollers. It has a relatively high stiffness and can roll extremely thin strips, The initial multi roll rolling mill is driven by a roll of workpiece, and then by an intermediate support roller.