To remain in the same area as the previous example, for a tube Ø70 the minimum roll bend radius will be 350 mm and the maximum will be a theoretically infinite value. Unlike the bend radius, the roll bend radius is much greater and goes from 5 times the diameter of the tube to infinity. This is decisive for the purposes of feasibility of processing. They are the same as for the bend radius, but the coefficients that we will have to consider are different. Also when it comes to roll bending (or tube rolling) tubes, there are formulas for evaluation of the roll bend radius.
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