Slip Rolls (Possibly)

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Subject Author Date
Slip Rolls (Possibly) M Cuthill 09-29-2006
Posted by campingstoveman on September 29, 2006, 6:19 pm
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 I know its not much help but I very occasionally roll 1 mm on my rolls
manually and I know I'm doing it.

Martin P

"Moray Cuthill cuthill_at_v21.me.uk>" <moray<dot> wrote in message
>
>>
>>> The design I'm looking to build is one with two upper rollers that are
>>> geared together, with a lower adjustable roller for setting the formed
>>> diameter.
>>
>> Uh! That is a bit unhandy. The bent sheet will touch the table / stand.
>> All (I have seen) designs have two lower rollers and one upper roller.
>
> Good point!
> Only reason I had the rollers around that way was I seen a picture of one
> built that way during my searches, and it was built up on it's own stand,
> so underneath was clear except for the connecting bar for holding it all
> together.
>
>>> But the question is, what kind of forces are involved, what material
>>> would
>>> be best of rollers, and most important, is this a suitable method for
>>> such
>>> thick metal?
>>
>> How wide do you want the rolls to be? How thick is the sheet metal?
>
> Wide enough to form 350mm wide sheet.plate, and material will mostly be
> either 4 or 5mm thick, but there may be the odd thicker, but narrrower
> bit.
>
> moray
>
>
> --
> Posted via a free Usenet account from http://www.teranews.com
>



Posted by =?ISO-8859-1?Q?Nick_M=FCller?= on September 30, 2006, 3:26 am
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 "Moray Cuthill" <moray<dot> wrote:

>
> Wide enough to form 350mm wide sheet.plate, and material will mostly be
> either 4 or 5mm thick, but there may be the odd thicker, but narrrower bit.

You won't roll that by hand. Or you have a gear 1:zillion
For the bending forces, I'll come back.


Nick
--
The modular DRO
<http://www.yadro.de>
Engine models
<http://www.motor-manufaktur.de>

Posted by =?ISO-8859-1?Q?Nick_M=FCller?= on October 1, 2006, 9:44 am
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> For the bending forces, I'll come back.

Thought that I have something at hand, but I was wrong.

Nick
--
The modular DRO
<http://www.yadro.de>
Engine models
<http://www.motor-manufaktur.de>

Posted by M Cuthill on October 1, 2006, 1:45 pm
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>
>> For the bending forces, I'll come back.
>
> Thought that I have something at hand, but I was wrong.
>

Thanks for looking.
I done some googling last night, and found a link to what looks like a good
source of information for calculating the required bending forces, but I was
getting a bit tired by that point and nothing was making any sense. It did
contain a chart showing the required tonnage for air bending mild steel,
which is what I was looking for, so I'll have another read of it when I get
some time.
That should give me the information about the forces involved, so I can
design the slip rolls accordingly. Only other thing I'll need figures for,
is how much force the steel rollers will take before bending. I'd like to
use as small rollers as possible, but would prefer to find out what I can
get away with by doing some calculations, rather than trial and error.

And once I've done that, I just need to sit down and translate the figures
into how much force will be required to turn the rollers, so I can select
suitable gears.

thanks
moray



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Posted by M Cuthill on October 1, 2006, 2:57 pm
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> A simple approach is to look at commercial machines able to do the
> rolling you need, and get figures for roller diamater, end plate size
> etc from them, thus getting you into the right zone at least.

I would do if I could find some suitable machines.
Only machines I've found so far that are capable of doing 6mm plate, are all
quite wide (in the region of 3ft upwards), and these are using 6+ inch
rollers.

Now since I don't need that width, I should get away with rollers that are
quite a bit smaller.

And taking some figures from two seperate industrial machines.
One can handle 50" width using 6.3" rollers.
Other can handle 80" using 8" rollers.

Now doing some calculations, cross sectional area of each roller is 31.16,
and 50.24 sq.in.
Now divide that by the length, gives 0.6232, and 0.628 cross sectional area
for each inch of roller width, so take 0.63 as a rough average.
Multiply by 14 inches, gives 8.82 sq.in, and convert back to diameter gives
roughly 3.35 inch.

Off course that figure is for hardened rollers, so 4" (100mm) unhardened
rollers should give quite a large safety margin.
And just looking at a diagram from one of the sites, the two powered rollers
can be a smaller diameter than the unpowered press roller, as they share the
load. So two bottom rollers could be 75mm, with the top one being 100mm.



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