Hard to tell from the picture but I suspect that the geometry of your swept blend is not a developable surface and therefore Creo will not flatten it in sheet metal. You can check this by looking at the Gaussian curvature analysis of the surface in question.
A developable surface is a smooth surface with zero Gaussian curvature. That is, it is a surface that can be flattened onto a plane without distortion.
Thanks for the reply, but this shape of Swept blend (even that seems easy doesn't follow) the unbend (half of the shape unbended) the other not, even that i tried with sketched rip still the problem is there.
I agree with tbraxton. You can use surface flatten for just a surface instead of sheetmetal for more complicated parts.
Sheetmetal isn't doing anything special other than applying a bend allowance based on machinery handbook calculation.
The K-factor (or y-factor) is a variable that if you haven't changed is .5 or bend centerline. During forming operations, this value is likely not correct.
The value you use would be based on the forming operation and material used to bend the parts. Usually your manufacturing or vendor can help you with that value.
Use the Gaussian curvature analysis tool in Creo and post a screen shot of the surfaces in question with the Gaussian curvature displayed. It most likely will show you why you are not able to flatten this.
Thanks, for directions, but not so comfortable to work with curvation, i have attached the file, so maybe you have a quickly idea for unbend it...really appreciate in any case 🙂
