[TheForge] 15Ton Press

Fri Jan 4 18:28:10 2002

Hey Ed,
I sent you 2 pictures of a  hydraulic press based on my window frame "H"
frame design, that Steward Pitrie recently built. It has an 8" diameter
cylinder.  The press will operate at 70 tons at 3000 PSI, but Steward is
presently running the unit at 2200 PSI,  appx. 60 tons.

It has a 16" throat, the slide rails are 2" square solid stock. The anvil
and top and bottom side plates are 1" x 6" flat bar.
I like the C P Pump because it is easy and precise to adjust the pressure,
But it is much more expensive than the 2 stage gear pumps.
You could probably  add an adjustable pressure dump valve to the system and
do about as well.

Remember that if you want to use the press as a rolling mill you will have
to balance both the cylinder and
hydraulic motor pressure/flow requirements with flowvalves to optimize the
system.

All my dies are welded to 5" x 6" x 3/8" steel plates and the plates slide
into rails welded to the top and bottom sides of the die bases on the press.
There is a stop pin welded to the back side of the die bases to register the
dies when you slide them into place.I lock my dies in position with a
butterfly clip which is a 3/8" x 4" x  1" piece of bar stock with a 3/8"
hole drilled centerline. This is bolted to the die bases so that the piece
can be rotated horizontally to remove, or vertically to lock the dies in
position. A 1/2 turn of the bolt locks or loosens the lock. I found that I
don't need to use the lock except when I am using taper dies.

For a simple stock shear I use a flat bottom die and a piece of small
railroad rai lweb ( cut the top of the rail off , square off the cut surface
and then weld the rail base to your die plate). It would be better to make
the blade section from H-13 to minimize heat deformation of the blade.

One of these days I hope to get a digital camera to make this easier to
understand.
Chuck
----- Original Message -----
From: Ed Fasula <[email protected]>
To: TheForge <[email protected]>
Sent: Thursday, January 03, 2002 9:29 PM
Subject: Re: [TheForge] 15Ton Press

> Hi Chuck & Ralph,
>
> I'm really interested in your ideas about using rollers.  I'm designing my
> press and I'd like to keep this future design in mind.  I haven't bought a
> pump yet - the compensated piston pump sounds interesting - do you
> basically set it at a given pressure?  Is it just one speed then?  I was
> planning on a Northern Hydraulics 2 speed gear pump, which wouldn't stop
at
> a pressure but my piston has a valve to lock it until forced to move -
it's
> off a construction fork lift.  So I could set it to a stock thickness.
Any
> idea on the power required to drive the roller?
>
> Chuck, I'm really interested in seeing the structure for a 70 ton
> press!  How wide is your span?  The book has a 10" opening.  I'd like to
go
> at least 12".  Have you ever wished to have it wider?  What is your die
> setup that you can change in 15 seconds?  I was thinking of using 3x3
> vertical bar and then plasma cutting blanks that I'd press around the 3x3
> bar (into a female die), that would form a box with one open end, then
have
> a hitch pin with a ball retainer to run horizontally through the 3x3 bar.
>
> Have you guys ever thought about making a hot shear with the press?
>
> Can you pass along some pictures?  Please use [email protected]
>
> Ed
>
>
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