scutter
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| posted on 26/1/14 at 08:27 PM |
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Dimpling box section.
Does anyone know how to dimple box section steel?
Let me explain, I've gotten hold of 3 sheets of 0.6mm ally for the sides and back of my car. I wish to paint the car,so countersunk rivets are
needed.
The alloy thickness is too thin to countersink, but should pull (self dimple) into the box section.
I don't want to countersink the box section as it will only leave 0.6-0.8 mm of material under the rivets, leaving a weakened box section.
So, I'm left with dimpling the steel, Any ideas out there? I have one but want to get other opinions first.
Here's what I mean.
 
Regards Dan.
[Edited on 26/1/14 by scutter]
The less I worked, the more i liked it.
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40inches
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| posted on 26/1/14 at 08:40 PM |
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Bond the panels on with Sikaflex, but only if you don't want them removable  I have to say that 0.6 is very thin, it will dent
very easily.
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theprisioner
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| posted on 26/1/14 at 08:46 PM |
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You get almost countersunk rivnut's in steel. You can fill a rivnut with resin and flatten off the panel. If you made up a counter bore drill
the same size as the rivnut head and thus could be made to be flat as the head of a steel rivnut is very thin.
Alternatively you could make a punch and mandrel to the exact shape as per your drawing, then apply an alloy countersink rivet.
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scutter
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| posted on 26/1/14 at 09:09 PM |
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I'll run the risk of the thin metal, it was free.
The countersunk rivinuts would remove as much steel and countersinking normal rivets.
I was thinking of using something like what is attached to this G clamps screwthread.
Regards Dan.
The less I worked, the more i liked it.
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ashg
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| posted on 26/1/14 at 09:24 PM |
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i would advise against doing it. it will make the chassis very weak in compression loads e.g a crash.
think of a length of tube compress it from both ends until its at the point of almost buckling under the pressure. then do it again with a small dent
in the tube. it will take less than half the pressure to make it fold!
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scutter
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| posted on 26/1/14 at 10:10 PM |
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Thanks for that Ash, I'm currently reading up on the effects of dimpling and dents on steel structures (the winter nights do indeed fly by)
I can understand your concerns, but isn't a similar weakening to drilling rivet spacing? i.e. a calculated risk.
ATB Dan.
The less I worked, the more i liked it.
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bi22le
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| posted on 26/1/14 at 10:34 PM |
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quote:
Originally posted by scutter
Thanks for that Ash, I'm currently reading up on the effects of dimpling and dents on steel structures (the winter nights do indeed fly by)
I can understand your concerns, but isn't a similar weakening to drilling rivet spacing? i.e. a calculated risk.
ATB Dan.
No, denting is worse then drilling. Drilling removes material without effecting the material around it, there maybe less, bur its straight.
Denting a tube leada that aide to bend. More material but more influence. I would rather have holes then bent sides.
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scutter
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| posted on 26/1/14 at 10:47 PM |
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Looks like dome rivets for me then.
Many thanks to everyone. Regards Dan.
The less I worked, the more i liked it.
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MikeR
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| posted on 27/1/14 at 12:24 AM |
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I understand what has been said but I'm curious about something. I thought swaging a panel added strength. how does the idea of dimpling differ?
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loggyboy
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| posted on 27/1/14 at 12:57 AM |
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Why not just buy thicker alloy and countersink it.? Seems a false economy to use something thats not going to allow you to what you want just because
you have it.
Ive been countersinking mind for areas I plan on vinyl wrapping.
http://www.locostbuilders.co.uk/viewthread.php?fid=37&tid=150452
Mistral Motorsport
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