Narrow 20-high mills are designed for small strips which are in the majority of cases for slitted materials. The cross sectional profile of these materials are for an example of a convex character, a concave character, a bone character or a wedge character. These characters demand different adjustment facilities of the rolls in the mill to adapt the roll gap exactly to the profile of the incoming material. With this high quality material this means flat material can be produced. Traditionally mono-bloc mills (SENDZIMIR) are equipped with crown adjustment and shifting facilities for influencing the roll gap and the profile. Modern cluster mills (DANIELIFROHLING) have included AGC adjustment facilities in their design to separate gap adjusting, tilting and bending of the rolls. So the adjustment facilities in the modern 20-high mills can be specified as follows: > Crown adjustment of the back-up rolls > 2nd, intermediate roll bending > 1st. intermediate roll bending > 1st. intermediate roll shifting > Tilting and adjusting of the upper roll chock. With these facilities the roll gap geometry can be influenced extremely.
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