problem with a seal

[PaoloColombani]

No. are tubes obtained by fold and then welded.
before polishing were extremely precise, after polishing they slightly deformed.

It's not customary. probably something does not go into the process they have used for polishing.

I saw the pdf scheme you attached. The idea seems good to me, I imagine you want to get a stagnant seal. to see the lip profile of the non-fatigue rings to believe that it can "strozzare" if not lubricated. with a similar profile maybe slightly increase the hardness of silicone resin could give results. But before looking for complex solutions I would try to walk the most trivial ways. I simply think that a silicone seal should be lubricated with paraffin (which provides a non-washable layer). How can you pose it? because the paraffin is medium solid (at room temperature) it can melt in epthane. Then the epic evaporates and leaves you a layer of paraffin. Alternatively, a ready detachment can be used to detach thermo-hardening resin from their moulds. other solution could be to apply paraffin fat, or petroleum (what you use to protect battery terminals).

 

[AngeloB]

Thanks for the advice.
I ask the supplier of the seal if it is a practicable road
I found a torino company that, very kindly, makes me a sampling of an anti-stick silicone paint, I will let you know.

 

[giovanni.a]

I am not a technician (in the strict sense) and I do not know if the seal is produced on design vs. market.
If it is yours, I would suggest a variant of the section that prevents curling. (see sketch attached).

Thursday
http://www.cad3d.it/forum1/album.php?albumid=81&pictureid=235

 

[AngeloB]

I painted the seal with a silicone varnish and it is now much more smooth. the lip does not curl and do not feel any more noise during the movement. the adhesion of silicone paint on the silicone is not optimal, but it is acceptable. However we decided to redesign the profile with an epdm rubber or thermoplastic, on which the painting adheres very well.
If you want I give you the address of the company that helped me, they were kind and (it seems) competent.

greetings

 

[atofras]

I would wait to go on the safe even if the ideas proposed all seem good to me but I have no experience about it. Hi.