![]() The radius of a roll bent tube is no longer determined, however, by a matrix with fixed measurements, but by a set of three rollers that approach or distance themselves from one another, cold shaping the tube and impressing the desired radius.Īs for bending, we speak of the mean radius in case of round tubes, and of inner radius for tubular elements, but to calculate the feasibility formulas we will always have to refer to the mean radius. 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. (77.1 kg) without accessories Minimum tube wall thickness ( of O.D. This is decisive for the purposes of feasibility of processing. (The vertex is where the center lines of the two. For additional bends, use the vertex of the previous bend as the reference mark, repeat steps 3 and 4 for the next bend. See Using the Bender, page 12, to bend the tube. This mark indicates the vertex of the bend. They are the same as for the bend radius, but the coefficients that we will have to consider are different. bend mark on the tube at a distance equal to the desired bend length. 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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