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# Re: Sheet metal corner problem.

Gears Esteemed Contributor

Hi @12GAGE

I think I have understood You now, and would like to suggest following approach:

• create a small slot in basic tab to split the two bend areas of the two flanges

• this will lead to an appropriate bending for the two flanges
• and a correct flat pattern as You have wanted it (with the small slot, but this is necessary to divide those two bending areas
regards
Wolfgang

# Re: Sheet metal corner problem.

Gears Esteemed Contributor

HI @12GAGE,

PS. You can reduce the slot length according to the bend width - I just have used a line with an undefined length

regards
Wolfgang

# Re: Sheet metal corner problem.

Honored Contributor

You understand the problem now. Horray!.

Sutch a simple problem that is not easy to solve.

Goals:

Automatic export of flat pattern lines

Check gap between finished part and other parts

# Re: Sheet metal corner problem.

Gears Esteemed Contributor

Hi @12GAGE

but what is to difficult with such a small slot?

Modeling with 3D CAD means to maintain to rules and possibilities.

You in fact can not bend this sheet of metal without having the small cut/break there.

Yes I know, that if this is a sheet with not to much thickness YOu will bend it anyway, but the geometry there will not be really defined or ruled.

And this is, what a computer needs to do, hold on rules!

regards
Wolfgang

# Re: Sheet metal corner problem.

Honored Contributor

The reason I want this design is to simplify the punching to a single cut(chamfer) around the corner.

This would also give the best weld space results for a seal welded tank if this was the lid inserted inside.

The small slot is not part of the desired result for automating exports of flat patterns to nesting software.

The only problem is CAD does not want to work the way our shop actually makes things. In real life, sheet metal does bend in two directions. Even if it is just for a small bit of the metal around a 2 way or 3 way corner.

I was thinking that there was a way to use surfaces, then enclosed surfaces to create a solid, then add that solid to the sheet metal flat pattern. This in turn would require the flat to be calulated from polygons rather than typical sheet metal unfolding.

# Re: Sheet metal corner problem.

Gears Phenom

Why not just do it exactly as @hawcad did, then go into the flat and use delete face to remove the slot?

Solid Edge 2019
Windows 7 Professional
Nvidia K2200 & Intel Xeon
"You're doing it wrong"

# Re: Sheet metal corner problem.

Gears Phenom

@12GAGE

So, if you're wanting to generate your flat pattern off of your Solid Model, then why model this with the flat pattern driving it and not just model it in 3D from the start? I bet you'll get better end results that way.

Solid Edge 2019
Windows 7 Professional
Nvidia K2200 & Intel Xeon
"You're doing it wrong"

# Re: Sheet metal corner problem.

Genius

Hi @12GAGE, to understand a little better the bending techniques they use, it would be very useful to provide us with a couple of images (if you can) so that we can probably provide a better alternative to the design.

Thanks.

Regards.

# Re: Sheet metal corner problem.

Honored Contributor

Nominus.

I don't care if the part is made from flanges or from added bends. No matter how the part is made, the same problem remains. I cant cut the flat with a 45 deg cham across the seam of the close corner.

Kanwulf

Right now we use one or two rectangular notches that requires more programming, punch time, tool wear, etc.

Attached are screen shots of the designs I want to use the chamed close corner for. This would clean up the welding gaps.

Here is a link to look at some typical products

http://americaneagleacc.com/mobilelubeskids/

# Re: Sheet metal corner problem.

Gears Esteemed Contributor

Hi @12GAGE

but closing the corner will do that, does  it?

regards
Wolfgang

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