Rolling mills may be classified according to the number and arrangement of the rolls. Let’s take a look at some of the different types of rolling mills used in ring rolling.
Two high rolling mills can be broken into two subcategories, reversing mill and non-reversing mill. In two high reversing rolling mills, the rolls rotate in one direction and then in the other, so that rolled metal may pass back and forth through the rolls several times. This type is used in plumbing and slabbing mills and for roughing work in plate, rail, structural and other mills.
Three high rolling mills consist of a roll stand with three parallel rolls with one above the other. Adjacent rolls rotate in the opposite direction so that the material may be passed between the top and the middle roll in one direction and the bottom and middle rolls the in opposite one.
Tandem rolling mills are a set of two or three stands of roll set in parallel alignment so that a continuous pass may be made through each one successively with a change in the direction of the material.
Cluster rolling mills are a special type of four high rolling mills in which each of the two working rolls is backed up by two or more of the larger backup rolls for rolling hard in materials.
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