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DocGreen
Posts: 15
Registered: ‎01-29-2012
Message 1 of 9 (643 Views)

Flatten A Curved Plastic Part

643 Views, 8 Replies
11-23-2012 10:35 AM

Suppose we have a plastic part modeled as bent around a cylinder with an x-axis. Because the material is plastic and the manufacturing method is injection molding, part stretch is not a concern.

 

Suppose further that the part is a solid part that will be converted to a straight spring. The part needs to be flattened to obtain the correct spring dimensions--the part may have variable width in the x direction.

 

What is the best way to flatten this part?

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blair
Posts: 3,943
Registered: ‎11-13-2006
Message 2 of 9 (634 Views)

Re: Flatten A Curved Plastic Part

11-23-2012 11:54 AM in reply to: DocGreen

Follow the steps for the first two "Folds" but use 179.9 degrees (can't have it intersecting/colliding with itself) for each fold.

 

You will need to work out the material length that you require.

 

This was just an exercise to have  the holes in a flat pattern before bending, but the "Fold" principle is the same.

 

You really could increase the length of the base item and create a clamp with holes on the end flanges.

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DocGreen
Posts: 15
Registered: ‎01-29-2012
Message 3 of 9 (614 Views)

Re: Flatten A Curved Plastic Part

11-24-2012 12:06 AM in reply to: blair

I can't open the attachment:

 

   Database schema for file C:\Users\xxxxx\AppData\Local\Temp\Flange.ipt is (17.0 (Build 170095000, 95)), which is newer than this version (16.0 SP2 (Build 160219200, 219)) of the software

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blair
Posts: 3,943
Registered: ‎11-13-2006
Message 4 of 9 (588 Views)

Re: Flatten A Curved Plastic Part

11-24-2012 11:29 AM in reply to: DocGreen

It is done in IV2013, as noted in my post signature. The only way to get this into IV2012 is to export to a neutral format which would loose all the detail in the model tree.

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Win7-64
EVGA X79 - Classified, iCore7 3930k 32Gb Quad-Channel
950Gb (2 x 500Gb Sata III SSD RAID0 Adaptec 6805E Controller)
Nvidia GTX-690 Classified - 335.23
SpacePilot Pro 3.17.7, 6.17., 4.11
Contributor
DocGreen
Posts: 15
Registered: ‎01-29-2012
Message 5 of 9 (586 Views)

Re: Flatten A Curved Plastic Part

11-24-2012 11:35 AM in reply to: blair

I'm taking the opportunity to update my installation to 2013.

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blair
Posts: 3,943
Registered: ‎11-13-2006
Message 6 of 9 (581 Views)

Re: Flatten A Curved Plastic Part

11-24-2012 11:46 AM in reply to: DocGreen

Install the SP1.1 as well.

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IV2015 up1 PDSU / Sim Mech 2015 /
Win7-64
EVGA X79 - Classified, iCore7 3930k 32Gb Quad-Channel
950Gb (2 x 500Gb Sata III SSD RAID0 Adaptec 6805E Controller)
Nvidia GTX-690 Classified - 335.23
SpacePilot Pro 3.17.7, 6.17., 4.11
Contributor
DocGreen
Posts: 15
Registered: ‎01-29-2012
Message 7 of 9 (566 Views)

Re: Flatten A Curved Plastic Part

11-24-2012 10:16 PM in reply to: blair

Now that I can see the part you posted, I think there is some miscommunication. I'm not trying to bend a part. Instead, I have a part modeled as bent around a constant curve -- cylinder around x-axis. What I need to do is straighten the part or unwrap surfaces so I can model the part as straight. I've read that others have had some success with using the sheet metal environment, but I'm hoping for a more direct and less klunky approach. The part has spline curves (as mentioned in the original description) that lead to variable width in the x direction and make ripping a shelled version of the part laborious.

 

I've attached two pictures. One shows the part shelled and gives a good example of the variable width I mentioned. The other is a side view showing the curves I want to straighten. Projecting from the curved surface to a 2D plane does not produce the desired result.

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blair
Posts: 3,943
Registered: ‎11-13-2006
Message 8 of 9 (560 Views)

Re: Flatten A Curved Plastic Part

11-24-2012 11:48 PM in reply to: DocGreen

Not as you have modeled it is it within the scope of Inventor. It could be done as Sheet-Metal in four pieces and then joined together to form an assembly (weldment) for the singe tube piece.

 

 

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IV2015 up1 PDSU / Sim Mech 2015 /
Win7-64
EVGA X79 - Classified, iCore7 3930k 32Gb Quad-Channel
950Gb (2 x 500Gb Sata III SSD RAID0 Adaptec 6805E Controller)
Nvidia GTX-690 Classified - 335.23
SpacePilot Pro 3.17.7, 6.17., 4.11
Contributor
DocGreen
Posts: 15
Registered: ‎01-29-2012
Message 9 of 9 (546 Views)

Re: Flatten A Curved Plastic Part

11-25-2012 10:51 AM in reply to: blair

I was able to get the desired result as a flat pattern (see image with strategic use of SHELL. I've yet to find a way to convert the flat pattern into a 3D editable solid.

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