Cold Forming Countersunk Holes
Cold Forming Countersunk Holes
(OP)
I am investigating a manufacturing process in our shop where we are cold forming (pressing) the countersink detail into the plate rather than machining it. The countersink is for a 3/4" bolt and a 3/4" plate. Problem is the plate is splitting to the end of the plate which is 1.625" from the end of the plate to the center of the hole. The material is a 50ksi yield plate.
Do any of you have any tips or tricks to correct this issue? It may be that we are just asking for too much and to get there is just overstressing the plate.
Thanks in Advance!
bduff
Do any of you have any tips or tricks to correct this issue? It may be that we are just asking for too much and to get there is just overstressing the plate.
Thanks in Advance!
bduff
RE: Cold Forming Countersunk Holes
Where is the upset material supposed to go?
RE: Cold Forming Countersunk Holes
Like 3DDave, I don’t understand why you need a countersink detail for a ¾” bolt on a hole in a ¾” pl. either. You could probably do what you are trying to do, if you heated the plate sufficiently and provided some forming pressure on the edge of the pl. in the immediate area of the hole. That certainly seems like the hard way to do this when a countersink and a drill motor would do the trick.
RE: Cold Forming Countersunk Holes
That was going to be my question. I doesn't seem like what you're proposing can work. The plate would have to deform, so if you did manage to get it so it doesn't split the plate (which would likely require heating it substantially), you'd end up with a bump on the back side of the plate. You can't change the volume of the steel; what is displaced from the countersink has to go somewhere.
Rod Smith, P.E., The artist formerly known as HotRod10
RE: Cold Forming Countersunk Holes
B.E.
You are judged not by what you know, but by what you can do.
RE: Cold Forming Countersunk Holes
RE: Cold Forming Countersunk Holes
"Everyone is entitled to their own opinions, but they are not entitled to their own facts."
RE: Cold Forming Countersunk Holes
Thanks to All!!!