I think the best place to put the 'binders' is all along the perifery. The
idea is to get most of the material from the inside of the blank to flow
out
into the walls. By doing this it has to stretch whereas if the material
flows in from the outside into the walls it has to crush leading to the
wrinkles. The amount of tension in the blank can be regulated by varying
the amount of excess in the blank and I believe what I have typically seen
is that the blank is 'rounder' than the punch, i.e. more excess along the
sides than in the corners. Good Luck
"super88" <tdeborde@[EMAIL PROTECTED]
> wrote in message
news:1159317396.319882.42970@[EMAIL PROTECTED]
> I'm going to post this message to all groups that I feel may be able to
> help. Bear with me, I'm ignorant, but ambitous. I'm tryng to make
> something similar to a cookie sheet. A little larger radius (2 1/2")on
> the corners and about 1 1/4" deep out of 22 ga. cold rolled steel. I've
> built a "press" using I beams and 25 ton bottle jacks to do the
> job.(Keep in mind if I could afford to job this out, or pruchase a
> press, things would be different.) Anyways, I've managed to make the
> part except for the corners wrinkle badly. I'm in the process of
> casting the female to allow me to use binders. The question is where is
> the best place to bind the blank? In the corners, or along the
> straights? Any help, opinions, suggestions, ideas are appreciated! I'm
> doing this with determination and junk layin around the yard. Buy a 10K
> press, hire a die maker...etc. are not the answers I'm looking for.
> Unless someone is willing to produce this for less than a grand. Thanks
> again!!
>
|
