For stamping die or FEA guys... One Step Formability NX 7.5

[3dr]

This is whopper for this venue but here it goes...

See attached screen dump if you have experience and think you can give me direction.

I want to map the green flange to the dark grey surface.

I've been through the help files on this (Very little detail provided) and think I'm close to getting what I need.

Below are my current settings in the "Analyze Formability - One Step" dialogue

1. Type = Advanced unform

2. Unform region = The green & light grey surfs

3. Target region = The dark grey surfs
(The dark and light grey surfs are matched topography & I want them to remain matched after mapping the green surfs)

4. Boundry conditions
Constraint Type = Curve to curve
Constraint List ??????

5. Advanced constraints = Left as "No addendum" (Dont need a binder but would like to be able to assign a pressure pad to the light grey surfs to stabilize the results)

The rest of the settings are pretty strait forward.

For #4: I've tried picking different curves and gotten some crazy results. Once successful on another job though too. I feel like if I just understood the logic behind those selections this would be useful tool.

I'm going to give up if I have to stab in the dark every time.

TIA and KUDOS to anyone willing to take the time to look at this one!

Dave

 

[3dr]

Ok I got results! See attached dump for mapped edges.

I selected "matched" edge curves (shown in orange) and that seemed to do it.


The blue line is the unformed edge result. What I dont understand is why there is edge mismatch (upper left of part) in the areas that arent really being formed.

Meshing to course between the shapes creating a large variable?

 

[uwam2ie]

What is your experience with the solution,
does it match with other (none Nx)software results or the real world? I have doubts on...
In the dialog of the pic you have used middle surface.
Have you created the middle surface? Inner or outer surface?
The mismath mismatch I thing is caused from the mesh.

 

[3dr]

This is pretty new to me. We havnt done much of this type of work internally. It's normally been covered in outsourced FEA before tool designs get started.

I'm under so much pressure to start these jobs that I dont want to wait on suppliers when the work is fairly predictable.

So here I am... The only other software we're using is Forming Suite but it only does the entire part at one time.

What you see are sheet bodies representing the midsurface of 2.5mm mat'l. I'm also using midsurface in the dialogue.

I think your right... While the topology is a match... the boundries are different. So Im thinking the meshing doesnt match exacting enough. Therefor there is some skew.

Having said that. This flange is fairly simple. I manually laid out some points and did a best fit to the mapped curves. It was a good... so Im pretty confident.

Just wish I better knew this tool. Id like to be able to assign pressure pads and pilots pins to force outputs consistant with how the tools restrict the movement of the material. Forming suite will do that part but no mapping to another surface set is available.

I really like the idea of staying in UG with the simpler stuff. Wish these things were better documented.

Dave

 

[uwam2ie]

Dave
tool designer mess,pressure with Jenni Lee? ;-)
By the way I know how it should work. But it is not Autoform or an altair software. For autoform I'm also familar with you can define presure pads or pilots. I think with formabilty analysis -fa will not (maybe never) cover these things. Fa is only basic. I thing it depends on the numbers of licenses they can sell - (more - higher priorty).

 

[3dr]

OMG too funny!

I'm living with the tools I have at this point. I did get good out put from UG. Just had to play with it alot to understand the setup well enogh.

I've heard Autoform is very capable but complex like UG. Maybe someday... for now it's gitter done.