×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

NX 9 sheet metal

NX 9 sheet metal

NX 9 sheet metal

(OP)
How to model sheet metal parts like this



and to be able to bend and unbend.I was trying with half feature and do mirror,but then I have problem with unbend.Couture flank and advanced flank are having problem with full circle SM parts.

RE: NX 9 sheet metal

This type of part is not manufactured using a 'bending' process, but rather either by deep drawing or by spin-forming on a rotating mandrel. In either case, due to the extreme deformation of the material, traditional unbending algorithms do not apply.

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

RE: NX 9 sheet metal

(OP)
Thank you for answering,yes you are right this type of SM parts are produced with technology you mentioned,and not bending, but if the thickens of the walls are the same in stock and finished part -volumes are not changed ,how to unfold the part to find the stock size,in this example it's the circular plate.Is it possible to do this in NX?

RE: NX 9 sheet metal

If it's true that the thickness is unchanged, and you have a 3D model of the part, just measure the surface area (of one side) of the model and use that value to compute the radius of a circle with the same area and you'll be pretty close. Granted, this method doesn't use any NX functions, just a bit of grade-school math winky smile

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

RE: NX 9 sheet metal

(OP)
Thanks for the tip.

RE: NX 9 sheet metal

I would strongly recommend upgrading to NX12. You can model the part in sheet metal using a circular tab and a secondary contour flange, the part will flatten using flat solid or flat pattern - enhanced to handle these conditions in NX12 (unbend will not work).

Another option is the flattening and forming tool added to modeling in NX11 (and improved in NX12) that will create a literal surface flatten (no distortion). Have a look here for a quick demo Flattening and Forming in NX12


Both methods produce a slightly different result and of course would be affected by material properties. There is another option - analyze formability - one step where you can define material properties.

On the part I created to experiment I got the following results:
Sheet Metal Flat Solid - ~50mm DIA
Modeling Flattening and Forming - 46.8mm DIA
Analyze One Step - 47.1 DIA

Select the method that best suits your process.

RE: NX 9 sheet metal

(OP)
Great stuff,thanks for sharing.

RE: NX 9 sheet metal

deedub777, did you try my 'mathematical' method as a comparison?

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

RE: NX 9 sheet metal

Quote (JohnRBaker)

deedub777, did you try my 'mathematical' method as a comparison?
I didn't save the part however did a quick re-run and found the mathematical approach was extremely close to the flattening and forming result (without fixed elements)

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources