Hi,
Here is the box I would like to get manufacture:
As you can see, there is basically two part going together.
The base:
And the top sheet, which is bended, but predrilled (pre lasercutted):
Here is a drawing how it is supposed to look:
The thickness is 8mm, the holes are 3mm diameter, and the bending inner radius is 8mm.
I know it is a bit heavy (8mm thickness), it is an imaginary model, the most basic example I could model.
I'll continue with more pictures and models in my next post.
How to unbend (flatten) a part for sheet manufacturing
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Re: How to unbend (flatten) a part for sheet manufacturing
Here are the dimensions of the top part:
What should I lasercut (which is already predrilled), so I can bend it at a different manufacturer.
Here are all the models used in the first post: Any pointers is much appreciated.
Also I read in the past about some unfolding workbench. What is the state of it?
The question is, how can I unfold this model? What should I lasercut (which is already predrilled), so I can bend it at a different manufacturer.
Here are all the models used in the first post: Any pointers is much appreciated.
Also I read in the past about some unfolding workbench. What is the state of it?
Re: How to unbend (flatten) a part for sheet manufacturing
I would take both the drawing with dimensions and the model (exported as STEP) to the manufacturer. I'm designing bended sheet parts at work all the time (well, using CATIA V5...), and the unfolded view of the part is optional as the bending radius also depends on the bending machine available to the manufacturer. Therefore, the manufacturer inputs the STEP model into his CAM software and that one unfolds it while considering machine parameters and material properties (grade of steel, aluminium or whatever). The STEP file is used to get the overall dimensions and bore positions, the drawing confirms the dimensions and adds information as to whether the bores contain threads as well as material, tolerances and surface treatment.
For 8mm material thickness, the shortest leg should be longer than approx. 55mm, otherwise the bending machine can't handle the part.
The bent radius won't be as smooth as modelled, though, as the material will flatten somewhat, especially at the ends.
Regards
Ektus.
For 8mm material thickness, the shortest leg should be longer than approx. 55mm, otherwise the bending machine can't handle the part.
The bent radius won't be as smooth as modelled, though, as the material will flatten somewhat, especially at the ends.
Regards
Ektus.
Re: How to unbend (flatten) a part for sheet manufacturing
So I shuold not take into account compression and tencion during the blending?
Wikipedia has a nice calculation method:
http://en.wikipedia.org/wiki/Bending_%2 ... lculations
I since have found some relevant infos, like the unfolding macro:
http://www.freecadweb.org/wiki/index.ph ... alUnfolder
Add wall tool:
viewtopic.php?f=24&t=8789
Wikipedia has a nice calculation method:
http://en.wikipedia.org/wiki/Bending_%2 ... lculations
I since have found some relevant infos, like the unfolding macro:
http://www.freecadweb.org/wiki/index.ph ... alUnfolder
Add wall tool:
viewtopic.php?f=24&t=8789
Re: How to unbend (flatten) a part for sheet manufacturing
If you like and want, you can, but normally it's not necessary. I normally leave such to the specialists at the manufacturer. They know their machines and material and employ specialized software that performs those calculations. I do add unfolded views with dimensions, using some generic setting for compression factor and some such, but as stated earlier, mostly that's just for information.So I shuold not take into account compression and tencion during the blending?
Regards
Ektus.
Re: How to unbend (flatten) a part for sheet manufacturing
the inside of the bend is under compression and the outside under tension, the neutral line is usually 1/3 of the thickness from the inside
Re: How to unbend (flatten) a part for sheet manufacturing
But I would like to get the sheet lasercut (at one place), THEN bend (at another place), the two manufacturing place are 80km apart from each other...ektus wrote:If you like and want, you can, but normally it's not necessary. I normally leave such to the specialists at the manufacturer.So I shuold not take into account compression and tencion during the blending?
Re: How to unbend (flatten) a part for sheet manufacturing
" But I would like to get the sheet lasercut (at one place), THEN bend (at another place), the two manufacturing place are 80km apart from each other...
it should work out ok if they use the same set back and bend allowance tables
it should work out ok if they use the same set back and bend allowance tables
Re: How to unbend (flatten) a part for sheet manufacturing
the surest way is to take a sample of metal you intend to use to the bender and have them bend it to the angle you want and measure it to find the bend deduction