lipped surface is not showing bends

[muhamedcad]

hi everyone..Haseeb here 

recently i created an sheet metal file of a lipped sink table top..lipping is given to a sink  for better drainage of water from the top..i gave this lipping using lofted flange(15 mm down from the top)..the problem is that this lipped surface is not showing any bend lines and i don't know if this is due to the lofted flange..someone please help me with this problem..i'm attaching a compressed file of this lipped sink top

many thanks 

[JDMather]

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@muhamedcad wrote:

..the problem is that this lipped surface is not showing any bend lines a

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If you turn the part over and look at the bottom 4 corners of the Loft, the geometry is clearly not created correctly.

The first thing to determine is, "How is this feature formed in the real world part?"

It appears to be a die formed stretch to me.

Inventor does not permit this type of feature combined as you have in sheet metal.

There is a partial solution in Inventor 2020 with Unwrap, but I do not think that tool is intended to give full fidelity flat pattern information with bend allowance calculation.