Inventor General Discussion

Inventor General Discussion

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Member
tfedoren
Posts: 4
Registered: ‎06-12-2012
Message 1 of 8 (451 Views)

2013 Unrolling a Flexible Beam

451 Views, 7 Replies
06-12-2012 02:04 PM

Hello,

 

I am trying to unroll a beam, but explaining is easier with a picture:

 

inventor.JPG

 

More accurately, I am trying to "unroll" the grey spiral so that its plane stays coincident with the plane of the brown beam, to which it is mated. So eventually I would want the grey spiral to be completely expanded, and horizontal in the same plane as the brown beam. I have been looking around to see if anyone has done something similar, but cannot find it. I am unsure of whether to make the grey part a sheet metal part (which allowed me to make the spiral in the first place) or to make a flat beam, and then use the bend feature, which seems a bit more difficult considering how many time I would need to bend it to create a spiral. Any suggestions would be very appreciated!

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Inv_kaos
Posts: 728
Registered: ‎07-26-2007
Message 2 of 8 (436 Views)

Re: 2013 Unrolling a Flexible Beam

06-12-2012 06:44 PM in reply to: tfedoren

Convert to sheetmetal will be able to unfold it to a flat part. Bending it from a flat bar would be a lot of work with a constantly varying bend radius.

Please mark as "Accept as Solution" if it answers your question or "Kudos" if you found it useful.
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Stew, AICP
Inventor Professional 2013, Autodesk Simulation Multiphysics 2013
Windows 7 x64 Core i7 32GB Ram FX2000
Member
tfedoren
Posts: 4
Registered: ‎06-12-2012
Message 3 of 8 (428 Views)

Re: 2013 Unrolling a Flexible Beam

06-12-2012 08:49 PM in reply to: Inv_kaos

Considering

"Convert to sheetmetal will be able to unfold it to a flat part. Bending it from a flat bar would be a lot of work with a constantly varying bend radius."

is there any way to more easily perform this task? Considering sheetmetal is scraped, I do not know how to make a constantly varying bend radius for the flat bar idea.

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Inv_kaos
Posts: 728
Registered: ‎07-26-2007
Message 4 of 8 (421 Views)

Re: 2013 Unrolling a Flexible Beam

06-12-2012 09:37 PM in reply to: tfedoren

"Considering sheetmetal is scraped" How so?

 

You could do it the way i used to design scrolls for centrifugal fans. It is an approximation of a constantly varying involute with 4 (in that case) arcs of reducing radius. Arcs are tangent and their centres are controlled by a symmetrical offset in the centre. Basically if you looked at the flat pattern of this part you would see the series of tangent edges getting closer and closer together (see attached) - you can then bend up at these locations with your radius from your formed model.

Please mark as "Accept as Solution" if it answers your question or "Kudos" if you found it useful.
---------------------------------------------------------------------------------------------------------------------
Stew, AICP
Inventor Professional 2013, Autodesk Simulation Multiphysics 2013
Windows 7 x64 Core i7 32GB Ram FX2000
*Expert Elite*
Inv_kaos
Posts: 728
Registered: ‎07-26-2007
Message 5 of 8 (414 Views)

Re: 2013 Unrolling a Flexible Beam

06-12-2012 09:59 PM in reply to: Inv_kaos

See attached for bend part option. I have just selected random dimensions, you should measure or link the developed length and radius from your formed part. I assume you want to do it this way so you can show it at various stages of unfolding? Did you know you can also use the unflod option in sheet metal parts to unflow one radius at a time?

Please mark as "Accept as Solution" if it answers your question or "Kudos" if you found it useful.
---------------------------------------------------------------------------------------------------------------------
Stew, AICP
Inventor Professional 2013, Autodesk Simulation Multiphysics 2013
Windows 7 x64 Core i7 32GB Ram FX2000
Member
tfedoren
Posts: 4
Registered: ‎06-12-2012
Message 6 of 8 (342 Views)

Re: 2013 Unrolling a Flexible Beam

06-13-2012 06:40 AM in reply to: Inv_kaos

Wow, thank you! I completely misread your first post as sheetmetal being UNable to unfold it to a flat part. I do want to show it at various stages of unfolding. I didn't know I could use the unfold option in sheet metal parts, but when I tried to create a Contour Flange with the spiral I drew, Inventor came up with an error and suggested decreasing the bend radius. I attached a picture. Any suggestions? I wasn't quite sure how you applied a symmetrical offset in the center..

Countour Flange.JPG

Member
tfedoren
Posts: 4
Registered: ‎06-12-2012
Message 7 of 8 (335 Views)

Re: 2013 Unrolling a Flexible Beam

06-13-2012 07:14 AM in reply to: tfedoren

It turns out, once I fully defined the spiral sketch, I could create a contour flange. From there, I created an assembly between the spiral and the brown beam from the first image on this thread. Now I am trying to figure out how to animate the bending of the grey part in an assembly!

 

Capture.JPG

*Expert Elite*
Inv_kaos
Posts: 728
Registered: ‎07-26-2007
Message 8 of 8 (329 Views)

Re: 2013 Unrolling a Flexible Beam

06-13-2012 07:59 AM in reply to: tfedoren

You are welcome, I am glad it helped! I think animation might be a bit more difficult but good luck.

Please mark as "Accept as Solution" if it answers your question or "Kudos" if you found it useful.
---------------------------------------------------------------------------------------------------------------------
Stew, AICP
Inventor Professional 2013, Autodesk Simulation Multiphysics 2013
Windows 7 x64 Core i7 32GB Ram FX2000
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