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metal bending

metal bending

(OP)
Can I bend 4140 steel 5/8 thick in press brake?

RE: metal bending

Don't know.

1. What is the nameplate (rated capacity) of the press brake?
2. How sharp a bend is needed? What inside radius, outside radius is acceptable?
3. How wide is the metal piece?
4. How many are you making, and what percent failure are you willing to accept? Sometimes, for one-of amounts, you can accept 5 or 6 failures to get one good piece that did not crack. When, in a production run, you cannot tolerate 1 failure in 1000. Or 10,000.
5. How will test for failure, and what failure rate do you anticipate? Hint: How much (if any) cracking or delamination or bad radii or bad "springback" from nominal?

RE: metal bending

See the formula below for approximation from Guidelines for
Fabricating and Processing Plate Steel

P = (0.833 x U x t2 x L)/W
P = estimated press load, tons
U = ultimate tensile strength, ksi
t = thickness of plate
L = length of plate to bend, inches
W = width of die opening, inches

RE: metal bending

And what is the heat treat condition of the 4140?
If annealed then probably, Q&T it would be doubtful.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

RE: metal bending


Quote (metengr)

t = thickness of plate

But the formula uses t2. Is that t x 2; or t/2 ; or "t2"?

RE: metal bending

It is t2

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