At present, the rolling mill is widely used, and the performance and operation control of this kind of equipment are relatively flexible. It corresponds to the added pair of shafts, the movable work roll and the middle roll of the height of the backup roll, and adjusts the position of the middle roll corresponding to the two edges of the rolling mill. The improved pressure distribution at the corresponding ends of the two mechanisms and the uniformity of elastic flattening of the work roll ensure the dimensional accuracy of the belt and reduce the defects, Such as thin and edge cracking.
Therefore, the rolling mill is suitable for cold-rolled steel plate and strip. It is a variant of the mill with four heights. The diameter of the work roll is 1 / 6 of that of the backup roll, and it is relatively offset to avoid the horizontal bending of the work roll, which is half of the rolling force of the four high rolling mill. The work roll has good stability and high horizontal stiffness. Its structure and adjustment are much simpler than the two high rolling mill. The rolling mill can be applied to a variety of models, so it is also called multi-purpose rolling mill, It has reversible and continuous cold-rolled sheet, which is suitable for cold-rolled silicon steel and non-ferrous metal steel.
It is composed of several working rolls and two pairs of backup rolls, which has a more stable roll system. However, its stiffness is similar to that of the four layer cold rolling mill, and the operation is inconvenient. Therefore, it is not widely used, and it is usually used to roll copper strip from high-precision submarine cable. The pair of rolls with the smallest diameter in the cold rolling mill are working rolls, and the rest are backup rolls. It has relatively high stiffness and can roll extremely thin strips, The initial multi roll mill is driven by a roll of workpiece, and then driven by the intermediate backup roll.
Two large-diameter backup rolls drive two groups of planetary rolls. The slab or slab can be hot rolled into thin strip at one time. If the continuous casting machine is used in the previous process, the subsequent process of using the temper mill simplifies the production process of hot rolled strip, and all rollers can be full of energy. This structure is similar to the structure of universal mill, except that the axes of vertical and horizontal rolls are placed in the same vertical plane and the vertical roll is driven.
