Inflatable Bladder Mould


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SergioLavalle01
SergioLavalle01
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Hi:

I want to make a hollow tube for an aerobar shaped lik " _/ "

I was thinking on making it with an inflatable blader and a epoxy mould sliced in 2.

What do you recomend?
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MAVERICK
MAVERICK
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Hey Sergio,

I've heard on here somwhere that somebody have used RTV silicone for this sort of job, I think the idea is that you would make your split mould then fill it solid with silicone. then remove this from the mould after it has cured and wrap it with carbon (I bet the carbon fibre braided sleeve would be great for your job) when you clamp this into the mould you put it into an oven and the silicone expands with heat putting pressure on the laminate. For an inflatable bladder you could use a latex bike inner tube... you would need to cap the ends though, and make sure your mould was tough otherwise it'd go bang in a big way!
ant...
ant...
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MAVERICK (13/03/2012)
Hey Sergio,

I've heard on here somwhere that somebody have used RTV silicone for this sort of job, I think the idea is that you would make your split mould then fill it solid with silicone. then remove this from the mould after it has cured and wrap it with carbon (I bet the carbon fibre braided sleeve would be great for your job) when you clamp this into the mould you put it into an oven and the silicone expands with heat putting pressure on the laminate. For an inflatable bladder you could use a latex bike inner tube... you would need to cap the ends though, and make sure your mould was tough otherwise it'd go bang in a big way!




Maverick - I like this idea, im gonna try this one day.  If you were making a tube though, how would you get the silicone out?

mhdgoul's idea seems best for this situation IMO, making tubes that look nice and straight is a pain.  

Id like to know where you could get the equipment to make your own inflatable bladers though???
Matthieu Libeert
Matthieu Libeert
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Hi,

I'm planning to do the same kind of stuff but on an easier scale, just for testing the technique...
This is the way I think i will do it:

I've ordered the Carbon braided sleeve 10mm a few days ago and the shipment will arrive tomorrow I think

1. I'll go get a PVC-tube, and cut it in halve
2. apply mouldrelease on both halves
3. Put an innertube of a bikewheel on the inside of the Carbon Fiber braided sleeve (also with lots of mouldrelease)
4. Coat the Sleeve with epoxy 
5. Close the 2 PVC-tubes with some ductape I guess 
6. Inflate with some compressed air
7. Let it cure

If possible I will pick something other than PVC so I could maybe put it in an oven to cure it with some heat.



Any remarks guys?

Matthieu Libeert
Founder MAT2 Composites X Sports
website:
www.mat2composites.com




jim
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babolat uses prepreg carbon in an aluminum halved mold. they roll the precise layers of prepreg into this mold and then they pressurize the mold to push the carbon out into the mold. then they send it into the oven. the raquets come out precise every time. i'm not sure you can improve this engineeing, but if you have any ideas, i'd sure like to see them. 
Edited 13 Years Ago by jim
H4RTM4N
H4RTM4N
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Hey guys,

This is a very interesting post. I want to make a long, hollow CF/EP tube to record with my GoPro. I could use an aluminum tube to make a half-mould. From there, I would make two halves and then glue them together. However, the joint would be visible and the tube wouldn't be as strong as a hollow, one-piece CF/EP tube. 

Using an Inflatable Bladder would certainly be the best idea. I carried out some research and I found some interesting videos/posts from a very clever guy that makes his own R/C planes.

Making an Inflation Bladder for Assisted Composite Part Fabrication

https://vimeo.com/10665397

Layup of The Wyoming Wind Works DLG Fuselage

https://vimeo.com/35648020

Demolding of the Wyoming Wind Works DLG Fuse

https://vimeo.com/37883424

I still don't understand how putting reinforcements and resin in each side of the mould separately ends up in a solid piece when the mould is closed. There has to be some overlapping that the bladder is pressing against the mould or another clever solution. Trying to find and answer to this, I found this interesting post:

Closed-Mold Vacuum Infusion with a Bladder

http://www.rcgroups.com/forums/showthread.php?t=1594856

Another way of doing this seems to be the following:
  1. Make the two-halves independently using joggle tools in each mould.
  2. Apply glue to the edges while the parts are still in the moulds.
  3. Close the moulds and apply pressure.
Check this post for more detailed information: http://www.rcgroups.com/forums/showpost.php?p=11804764&postcount=135

Has any of you guys made a one-piece hollow part using any of these techniques? I'm seeking for advice because I'm very new to this. 
GO

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SergioLavalle01 - 13 Years Ago
MAVERICK - 13 Years Ago
ant... - 13 Years Ago
matthieutje65 - 13 Years Ago
jim - 13 Years Ago
H4RTM4N - 12 Years Ago
mhdghoul - 13 Years Ago
Manu - 13 Years Ago
prsw - 13 Years Ago
Zebra - 9 Years Ago
ArturK - 7 Years Ago

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