Post #215
No, the standard dies will do it without wrinkling the tube, but they also do some specialist dies that force more of the tube to go through tension during bending and then the wiper dies compress it back closer to round.
It will help stop wrinkling if you're doing very thin stuff (i.e, less than 1mm wall thickness), but it also gives a much smoother bend with less deformation of the profile of the tube compared to normal dies.
Downside is it takes more power to bend the tube compared to standard tooling, and there's a bit more wear and tear on the tooling from the pressure, but it's worth it reduce stress concentrations in the cages imo.
It basically gives you a bend that's very close to something that would come off a mandrel bender.
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