problem estrusione

[Francocen]

Bye to all,

I just joined the forum and hope I have chosen the right section for this question:

I have to solve this problem.

the diameter d0 of a copper billet (length l0=250 mm) must be reduced from 127 mm to 60 mm. the characteristics of the material are shown in the table.

tfusion (°c) and (gpa) y (mpa) uts (mpa) a% k n c m
800 100 700 900 10 315 0.54 240 0.06

by operating a reverse extrusion (right angle matrices) the extrusion pressure with the following report has been satisfactorily estimated:

p=(σ_f )(0.8+1.3*ln r)

processing takes place at 100°c.

calculate the power needed to achieve the reverse extrusion process

not having any data of speed or time how do I get a power?

Thank you for your help!

 

[MBT]

You don't even know how many steps to do that.
You don't think you're going to spend 127 to 60 in one shot, do you?
Extrusion or lamination?

 

[Francocen]

It's about drawing.

but even if the measures were minor how would I find the necessary power?

 

[MBT]

a few ideas but well confused, I think.
you do not have enough data, you are not sure of the process (the formulas change), you cannot make a calculation.
extrusion is something
drawing another
lamination another

for lamination I should have to have a sheet of xl that makes calculations, but I have to look for it and I fear it is protected by industrial secrets

For the rest... I know

 

[Bernoulli]

the speed of deformation έ you should have it by force, otherwise how would you calculate the σ of plastic flow since the process temperature comes to you? the generalized power law is : σ (plastic flow) = c ε^n έ^m