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. 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. Hot bending involves applying heat (by a tool such as a blowtorch) to soften a portion of metal tube held in place with a clamp, then bending it to the desired angle. The user heats the coil and applies pressure to bend the softened tube to the desired angle. Also when it comes to roll bending (or tube rolling) tubes, there are formulas for evaluation of the roll bend radius. Induction bending involves placing a heat induction coil around a tube at the bend point.
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