CREO 3.0 Sheetmetal design bowl with form future

[MM_9095838]

Hello,

I have made a bowl with a hole in it (see picture) but now want to get the proper flat pattern. I have achieved this with the 'flatten form' future but then the flat pattern dia is as big as the formed dia. 

How do I use the form futures properly or is there a different method? Some context: Right now we have a 3/16 HSLA round plate that we fully punch with some hyd magic. So I like to make the form that I want and then make the flat pattern. See second picture with desired measurements 

Thank you for your time and let me know when you need more info

Kind regards,

Maurits 

[StephenW]

In creo, the flat pattern is based on machinery handbook calculation with user variable for the 'Y' or 'K' factor that accounts for material stretch during the forming operation.  The common use is press brake bending which is typically a straight bend.

Your model would require a much more complex calculation.

I do think that your part would basically not stretch (at least not much) due to the large radius. So any giving direction could be calculated with a via the part centerline. You could also potentially use the flatten surface feature 

[tbraxton]

@StephenW  has offered an explanation and a workaround of flatten quilt but be advised that this will not have high fidelity with respect to distortion of formed metal. If you need this for tooling, then use another method to develop the flat pattern unless you are willing to iterate.

The issue is with the concept of a surface being developed (geometry/math). The radius of the bowl cannot be flattened without distortion hence it is not developable. Creo can only generate the accurate flat pattern for surfaces that can be developed in a mathematical context.