Forging Ratio

[WeldGk]

Is there a set method to combine the forging ratios for cumulative forging processes? I.E. if there are several forging steps taken, how do I combine the reduction ratios from each step to get the total reduction ration to report?

 

[CoryPad]

Strain is additive, so total strain [ε]_N, incremental strain [ε]_i, and number of steps N are related:

[ε]_N = N [·] [ε]_i

reduction r is related to initial area A₀ and final area A, regardless of number of steps, by:

r = (A₀-A)/A

and reduction ratio RR for a single step is

RR = A₀/A = exp ([ε]_i)

or for multiple steps

RR = A₀/A = exp (N [·] [ε]_i)

 

[arunmrao]

Forging work ratio

http://www.eng-tips.com/viewthread.cfm?qid=191256

Forging work ratio

http://www.eng-tips.com/viewthread.cfm?qid=191049

You might like to visit earlier threads on the same topic and the calculate the actual forging work ratio.

I have not failed. I've just found 10,000 ways that won't work." — Thomas Edison
_____________________________________

 

[WeldGk]

So if I start with material that has a HWRR of 5.0:1 then I forge the material 1.57:1 and then upset it 1.06:1, how can I know what the total forging reduction ratio is?

 

[redpicker]

Reduction Ratios are multiplicative.

If you start with 5:1 forge it 1.57:1 then upset it 1.06:1

= 5*1.57*1.06 = 8.3:1

rp

 

[Eukeni]

Hello everybody!

Would the translation of the material have an increment on the forging ratio besides the one coming from the cross-section change?

For example, starting with a cross-section of circular shape and finishing with a ring-shape cross-section (this is, a hole in the middle). Would in that case the forging ratio still be the division of the starting and finishing sections?

I hope I explained myself.

Thanks in advanced.

 

[CoryPad]

If the strain is not uniform, then translation has an effect. For, example cylinders that are upset assume uniform strain, but any barreling introduces non-uniform strain that may not be added to subsequent deformation.