Inventor General Discussion

Inventor General Discussion

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Distinguished Contributor
carbonated
Posts: 213
Registered: ‎06-14-2006
Message 1 of 25 (151 Views)

Creating geometry on a curved surfaces

151 Views, 24 Replies
01-08-2008 07:07 AM
I have a cyclindrical sheet metal part (.1 thick) that has a series (or a pattern) of cutouts that are radial to the CL of the cylinder. The cutouts are made on a flat metal sheet and then folded to the correct OD before butt welding the ends together.

If I create a workplane on the OD, then create a sketch of the cutout geometry and do an extrude cut, the geometry of the part will not be perfect as the WP is flat and does not take into effect the curve of the OD.

Is there a way to make the cutout geometry on a flat pattern and then fold the piece to the correct OD? This would make the part correct and is how the part is manufactured.

Thanks in advanced!
*Expert Elite*
JDMather
Posts: 28,056
Registered: ‎04-20-2006
Message 2 of 25 (151 Views)

Re: Creating geometry on a curved surfaces

01-08-2008 07:23 AM in reply to: carbonated
Can you post the file?

Create a sacrificial planar face.
Start a new sketch on the face and Project Flat Pattern.
Create you sketch geometry.
Cut Across Bend.
Cut the sacrificial geometry.

Probably a few other ways as well.
Please mark this response as "Accept as Solution" if it answers your question.
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*MarcoA
Message 3 of 25 (151 Views)

Re: Creating geometry on a curved surfaces

01-08-2008 07:54 AM in reply to: carbonated
il giorno 08/01/2008 16.07 carbonated ha scritto:

> I have a cyclindrical sheet metal part (.1 thick) that has a series
> (or a pattern) of cutouts that are radial to the CL of the
> cylinder. The cutouts are made on a flat metal sheet and then
> folded to the correct OD before butt welding the ends together.

Why not to cut before folding, then (see attachment, IV11)?


M.
Distinguished Contributor
carbonated
Posts: 213
Registered: ‎06-14-2006
Message 4 of 25 (151 Views)

Re: Creating geometry on a curved surfaces

01-09-2008 12:37 PM in reply to: carbonated
I have no idea what you are talking about (sacrificial planar face). See the attached file. Please dumb your answer down more if you can:smileyhappy:
Thanks!
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JDMather
Posts: 28,056
Registered: ‎04-20-2006
Message 5 of 25 (151 Views)

Re: Creating geometry on a curved surfaces

01-09-2008 02:34 PM in reply to: carbonated
Can you zip and attach the ipt?
Please mark this response as "Accept as Solution" if it answers your question.
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Distinguished Contributor
carbonated
Posts: 213
Registered: ‎06-14-2006
Message 6 of 25 (151 Views)

Re: Creating geometry on a curved surfaces

01-10-2008 05:19 AM in reply to: carbonated
This is a simple version. The version I ma working on has a more complex cutout.

Thanks in advance!
*MarcoA
Message 7 of 25 (151 Views)

Re: Creating geometry on a curved surfaces

01-10-2008 06:01 AM in reply to: carbonated
il giorno 10/01/2008 14.19 carbonated ha scritto:

> This is a simple version. The version I ma working on has a more
> complex cutout.


This is the workflow I'd follow.

M.
Distinguished Contributor
carbonated
Posts: 213
Registered: ‎06-14-2006
Message 8 of 25 (151 Views)

Re: Creating geometry on a curved surfaces

01-10-2008 06:39 AM in reply to: carbonated
Thanks Marco but your method is too complex for me to understand.
*Expert Elite*
JDMather
Posts: 28,056
Registered: ‎04-20-2006
Message 9 of 25 (151 Views)

Re: Creating geometry on a curved surfaces

01-10-2008 06:56 AM in reply to: carbonated
>This is a simple version.

Since you didn't post the actual dimensions I didn't take the time to build in the parameters as a function of the geometry.

The flat patttern takes several minutes to calculate so be patient.

What release of Inventor did you say you were using?
Please mark this response as "Accept as Solution" if it answers your question.
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Distinguished Contributor
carbonated
Posts: 213
Registered: ‎06-14-2006
Message 10 of 25 (151 Views)

Re: Creating geometry on a curved surfaces

01-10-2008 07:01 AM in reply to: carbonated
JD,

I use V11 so I cannot open your file. Thanks anyway!
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