If you read up on the roller mfg, they do ANGLE IRON rolls with the leg
***IN***. Sure, they have limitations on how long the leg is but it can
and is done every day. For the angle iron, the roller die has to have a
suitable slot so the inward leg is constrained while bending. It is
being compressed so it will expand (the web will get thicker).

For the OP's profile, the main web needs to expand, leaving the inward
flange at close to the original diameter.

Ed Huntress wrote:
"RoyJ" wrote in message
...
Operative word is 'roller'

A quick google brought up this mfg: The largest unit on this page
http://www.wikco.com/rbndr.html
will easily handle this cross section. Most of these roll benders will
operate in either the vertical position (shown) or horizontal position
(better for this project) There is a max size calculator at the bottom of
the page.

snip

OK, but I don't see it, Roy. The angled flange, or cone section if you
prefer, is going to wrinkle like crazy if you try to do this on a roll
former. Custom roller profiles won't help, IMO. Rolling a perpendicular
angle is a lot easier, because the leg is not trying to spring to the
outside -- they just constrain it like the walls on a piece of rectangular
tube.

There just is no way I can see to apply the force necessary to compress an
angled flange progressively, so that it doesn't wrinkle, with a normal roll
former. The forces required would be huge.

But maybe the OP will want to call a roller manufacturer or a jobber and see
what they say.

--
Ed Huntress