The Baron
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| posted on 1/1/07 at 08:36 PM |
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Bending Square RHS
Has anyone sucsessfully bend any of the 25 RHS which we use to build our chassis from? If so, how?
Cheers,
The Baron
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mark chandler
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| posted on 1/1/07 at 08:42 PM |
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Yes, between three rollers in a cast machine !
Not a lot of use without the machine I,m afraid.
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DIY Si
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| posted on 1/1/07 at 08:46 PM |
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Have to ask why? Any bits that need bending in 1" will curve in on the outer edge. Surely round tube would be better?
“Let your plans be dark and as impenetratable as night, and when you move, fall like a thunderbolt.”
Sun Tzu, The Art of War
My new blog: http://spritecave.blogspot.co.uk/
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macnab
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| posted on 1/1/07 at 09:08 PM |
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heating with a borrowed oxy set will work just bend round an steal pipe.
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Danozeman
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| posted on 1/1/07 at 10:01 PM |
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It will fold in if it isnt bent properly. Why do u need to do it? Id cut an angle out of it, bend it and weld it up.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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goodall
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| posted on 1/1/07 at 10:14 PM |
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heating it will make it brital
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Simon
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| posted on 1/1/07 at 10:38 PM |
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quote:
Originally posted by goodall
heating it will make it brital
So weldings out then
ATB
Simon
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nitram38
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| posted on 1/1/07 at 11:08 PM |
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Actually, heating will make it soft!
Rapid cooling (quenching) will make it harden.
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MikeRJ
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| posted on 1/1/07 at 11:09 PM |
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quote:
Originally posted by goodall
heating it will make it brital
Bit of a generalisation there! Depending on the temperature you heat it to, and the speed at which the part is cooled, you can also soften steel.
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gazza285
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| posted on 1/1/07 at 11:13 PM |
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Overheating will make it brittle. I would recommend forming the bends on a set of rolls like Mark Chandler did, or having them formed using proper
formers to avoid the swelling as allured to by Simon, although battering with a big hammer can cure the swelling problem. Somebody will probably tell
you to then have the whole thing stress relieved, but I wouldn't bother. What's it for anyway?
DO NOT PUT ON KNOB OR BOLLOCKS!
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macnab
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| posted on 2/1/07 at 12:05 AM |
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quote:
Originally posted by goodall
heating it will make it brital
not if you cool it down slowly, quenchings a no no.
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Alex B
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| posted on 2/1/07 at 05:00 PM |
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something like this?
http://www.metalgeek.com/archives/images/deform_jig.jpg
Alex
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britishtrident
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| posted on 4/1/07 at 07:40 PM |
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Actually heating won't make it soft or brittle --- heating and cooling low carbon mild steel has virtually no effect on either -- thats why
it is the material of choice welded chassis.
However if you keep mild steel very hot for an extended period followed slow cool you will get grain growth -- which reduces the fatigue resistance
and generally lowers the mechanical properties.
To refine the grains you have to get the whole part very very hot then cool quickly, which won't have much if any hardening effect on low carbon
mild steel.
High carbon steels on the other hand are a whole different ball game.
[Edited on 4/1/07 by britishtrident]
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Bob C
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| posted on 4/1/07 at 08:05 PM |
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I think commercial chassis with bends are designed that way for production reasons - a spaceframe should be made of straight sided triangles!
Bob
PS they'll be done cold...
[Edited on 4/1/07 by Bob C]
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flak monkey
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| posted on 4/1/07 at 08:08 PM |
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quote:
Originally posted by britishtrident
Actually heating won't make it soft or brittle --- heating and cooling low carbon mild steel has virtually no effect on either -- thats why
it is the material of choice welded chassis.
However if you keep mild steel very hot for an extended period followed slow cool you will get grain growth -- which reduces the fatigue resistance
and generally lowers the mechanical properties.
To refine the grains you have to get the whole part very very hot then cool quickly, which won't have much if any hardening effect on low carbon
mild steel.
High carbon steels on the other hand are a whole different ball game.
[Edited on 4/1/07 by britishtrident]
I was just going to say that - but you said it already
There is some embrittlement when welding mild steels, but not a huge effect, and unless the struture is repeatedly subject to very high loads then
there is no cause for concern.
David
Sera
http://www.motosera.com
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gazza285
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| posted on 4/1/07 at 09:12 PM |
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Heating it up to bend it and heating it up to weld are different things though, welding is done in a controlled atmosphere to reduce oxidation and
contamination, that's why I warned against overheating it to bend it. Cold forming with the proper formers is better.
DO NOT PUT ON KNOB OR BOLLOCKS!
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