Bend lines not showing on drawing of a lofted part

[Anonymous]

I've created two parts to be placed on the outside of a silo so they are sort of off centred cone pieces, attached below. When i converted to a sheet metal part and created the flat pattern, there are no bend lines. There are also no bend lines if you make a drawing of the parts.

[IgorMir]

It is a rolled part with a twist. Where the bend would be?

Cheers,

Igor.

[johnsonshiue · Accepted solution]

Hi! The sheet metal part was created using developable spline surface (Loft). The unfolding was done by numerical process. There is no actual straight bend line.

Many thanks!