Brake press tearing corners...

[monkeyevil]

We are bending parts cut from our CNC plasma cutter in a 60 ton Accurpress. Using a 2" wide bottom die.

When bending .250 the metal tears where a 90 degree corner meets. We can design around many of these corners, but some have to be there. I've tried putting a .250 hole in the edge of the corner, but it still tears from inside the hole, sometimes .375 or deeper.

Any ideas?

[ViperTX]

I would think your bend radius is too tight. Also, your metal might be too hard.

Paul

[GaryCorlew]

A couple of things I have done in the past is radius the edge in the bend area, this will spread out the stress, also I have greased the die to allow the plate to slide easier. What kind of plate is it?

[diycnc]

try a larger radius top punch. also the heat from the plasma may cause the metal to be more brittle near the edge.

[monkeyevil]

Originally Posted by GaryCorlew A couple of things I have done in the past is radius the edge in the bend area, this will spread out the stress, also I have greased the die to allow the plate to slide easier. What kind of plate is it?

I am pretty sure it's 1045 hot roll. There is a chance it could be A-36.

[JerryFlyGuy]

got any pic's you can show us?