What variety of soft metal are you referring to?
I fear you are going to be terribly disappointed with the results.
If the metal you are flattening is narrow enough you would be far better
served with a rolling mill. Not real cheap, but much more effective.
If you persist with the press, you'll just have to fabricate two heavy
plates to fit.
...but don't expect the metal to stay flattened once you remove the 12 tons.
(Don't take my word for it. Give it a go. Then Google "rolling mill".)
Go to a welding shop and ask them for 2 plates of A36, 12" X 12 inches
and at least 1/2" thick. If they have anything the is close, but still
small enough to fit under your press, ask them if you can borrow them.
Take them home and try them out. Since your press may not have the
power to flatten the whole part at once, also try to get a 6" X 6" piece
of plate. Place your workpiece on the big plate, then put this smaller
plate on top, squish, move the work, and squish in the next spot. If
this works, you may have to bevel the edges of the smaller plate so it
doesn't dent the workpiece at the edges.
I have flattend 4" X 16" pieces of 16 ga steel successfully with this
method using my 20 ton HF press.
Going to your web site, I have basically the same Chinese press you do.
Doesn't anyone make some kind of die set that would fit the ram of such a
press as an off the shelf piece of equipment? It seems like a real hassle
to to have somehow balance two thick pieces of steel, then get a third one
My application is flattening rackmount rails on equipment or fixtures that
slide into rackmount equipment. I need to have both hands on the piece I
am working with and really wanted to avoid having to balance the plates on
either side of the equipment.
I'm willing to pay up to $200 for the die set.
Since most people don't use these for flattening things, and
those who do are usually capable of making custom tooling for their
needs, the answer to your question is "No".
Once you find whether you *can* do the job with your press as
described, now is the time to build your own fixtures for attaching the
plates to the press.
So -- make up a way to attach the lower plate to the support,
and the upper plate to the ram of the press. There should be dozens of
ways to do it, depending on what tooling you have.
And I'm not willing to make it for that -- especially since I
don't have the press to test it, or the tooling to weld up the fixtures
which would be the best way to do it. I suspect that the same applies
to most of us here -- at least the "not willing" part. This is a hobby
newsgroup -- we are in it for fun, not to make things for money.
You might find someone who will.
Where are you getting rack-mount rails that are this badly
distorted? The worst that I have seen could be fixed with a pair of
duckbill vise grips. :-)
Email: < email@example.com> | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
A piece of pipe that will fit over the ram with a set bolt to hold it
on, welded on to a plate the size you need, braced to the corners and
edges with triangular plate. Weld the bracing plates to the pressing
plate and the pipe. Another flat plate for the bottom should do it.
Hope that at least gives you some ideas.
There is no cheap attacchment to do this.
A piece of 3/4" tool steel to make this part is $308 from McMaster.
If you load a 3/4" thick 8" x 12" plate in the middle, with 12 tons,
it will bend.
If you are pushing on a rubber sheet, so the load is uniform, it will
bend about .040" in the middle.
If you have the lower plate supported at the ends, and push with 12
tons in the middle, it will bend about .100"
You have a problem.
In order to help you , what we need are some pictures of whats bent, the
metal thickness and where you want it trued up.
A picture is worth a 1000 words.
Ive been bending and straitening metal for 40 yrs and there must be a
simpler way than using a press.
Await the pics.
then ill think up a simple way for you to do your job.
Master metal worker and problem solver.
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.