coining formula
coining formula
(OP)
Does anyone now of a formula to calculate the amount of pressure it takes to coin (reduce) the thickness of metal?
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RE: coining formula
(of course that answer is way to simple for you I'm sure, but the method is right there.)
Nick
I love materials science!
RE: coining formula
RE: coining formula
I based my answer off of the basic need for greater than yield strength stresses to casue material to permanently deform.
RE: coining formula
RE: coining formula
Or 1008/1010 and 4130...
I've been trying to get out of the habit of expecting people to understand things like "ten oh eight ten ten"
RE: coining formula
F = 4.5σfAp
where σf is the flow stress and Ap is the cross-sectional area of the punch
Flow stress obviously depends on the material & thermomechanical processing history. The stated accuracy of this method is ~ + 10%.
RE: coining formula
In practice, I found more ductile metals such as aluminum, bronze, brass, copper, etc to behave like 0.52 X yield. This idea is used extensively in the oil industry for shear load computations on knock out plugs, etc.
Works very well, well within 5% error theory verses practice.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada