On May 25, 8:46*am, "Denis G." wrote:
On May 24, 4:37*pm, MrFightGuy wrote:









Hey all:

I'm wondering what it will take to put a 2-3 inch curve in a 21 to 24-
inch wide sheet if 1/8 inch thick 7075-T6 aluminum. *I ask because I
run a business making stage weapons out of 1/4 inch 7075 plate, and
would like to be able to offer shields as well. *Flat shields are
fine, but curved shields are more user-friendly. *I realize that 7075
is not an alloy that is friendly to forming operations, but we're
talking about a slight curve in a relatively large, thin piece.

Specifically, will a 20-ton shop press (with a shield-sized stamping
mold attached, of course) do this job? *I say 20 ton, because that's
the smallest size press that will accommodate a work piece at least 21
inches in width, and it's about what's in my price range.

Ultimately, I'm hoping to make both square shields and dished rounds,
but if these operations require heavy industrial rollers and spinners,
then I'd rather not spend the dough on such a large press. Does anyone
have any advice to give?

Thanks,

Nathan

http://www.suppliersonline.com/prope...075.asp#Videos
(no video)

From the above link, it seems that spring-back will be a problem.
You'd probably need the ability to anneal the piece at 900 deg.F for 3
hrs and do controlled cooling. *Also the link says that it helps to do
forming at 200 - 250 deg.F.

Ooops -- Anneal at 900 deg.F for 2 hrs followed by water quench.