Deep Draw Thinning of Vac Formed Sheets

[adam1986]

Creo 2.0 - ENG III Pack
I am relatively new to creo (especially the surfacing & Tooling side of things) so was wondering if i could have some help.

I am creating tooling for a deep draw vacformed part (draw is approx 600mm), which has come from our Industrial design department.

The Top (A skin) is an Aesthetic Skin

The Lower (B skin) is a 5mm Offset and becomes the control skin for the vac form tool

However, during the Vacform process the material thins by around 2mm

The nest for the A skin needs to closely follow this thinned Skin, as the vacform will warp or distort where it is not sufficiently supported.
(In some of our shallow draw parts we do not account for thinning)

The Top 50mm has a uniform thinning of 0.2mm and the bottom 50mm has a uniform thinning of 0.3mm.

Both top and bottom 50mms have been copied into the new model with an appropriate offset and then individual thinning points created, bounded blends are created through these points, which stitches these two offsets together.

As you can appreciate, this is quite a messy method and is also very time consuming. (It also lacks tangency on some points)

I was wondering if there were any techniques or addons available that would help me create a "variable offset" or indeed a thinning feature in any tooling functions that would help me along??

Once again, thanks in advance

Adam

 

[CorBlimeyLimey]

Can you post an image of the cross-section and overall shape of the part?

 

[adam1986]

Section has been attached

This is the control face, the offset face will need to be thinned, hence the requirement of a variable offset.
We have a measurement report, so know how much thinning will be required at certain points around the forming.