Solutions For Better Design:
To the uninitiated, the roll forming process might appear to be an easy business
to work in and understand. However, there is a host of engineering guidelines and technical solutions that roll formers and experienced customers need to know.
This small group of "Do's and Don't of Roll Forming" does not seem to be very
sophisticated, you might suppose
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but it is. Just ask us.
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The outside leg on the metal
building panel stock, when rolled straight, will be
wavy. Forming a slight bend in the leg will help to
flatten it.
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The flat
180° hem, when roll formed, will be wavy. By forming a
tear drop hem, the edge will be flat.
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90° legs on
most metal building panels add more forming passes and
will mark the legs. Forming a 75° leg reduces the number
of stations and does not mark the leg.
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Avoid sharp inside radii;
they are difficult to form without marking the outside
radius or cracking the paint on pre-painted material. A
larger radius reduces this problem.
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When roll
breakage occurs because of a narrow slot design, a wider
slot design will alleviate the breakage.
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When the
rolled leg is to short as shown, use approximately 3
times the material thickness on the legs to achieve
stiffness.
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When a
section has a roll form on one end and a wide flat on
the other end, put a leg on the end or a groove near the
end to maintain straightness.
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If a wide
sweeping radius is impossible to control, put a bend in
each end to keep it straight.
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