Question

- A metallic bar is to be cold withdrawn from 8mm diameter to 6 mm through a die with an angle, half-angle, of 15° and with coefficient of friction of 0.12. The strength coefficient for the bar K= 300 MPa and its strain hardening exponent n = 0.35. calculate:

- Area reduction.
- The inhomogeneous deformation factor, F.
- The drawing force (N).
- Is the reduction possible?

Answer #1

Hot forging is used to reduce a metallic cylindrical workpiece
with a diameter of 12 cm and height of 25 cm to a height of 12 cm.
Barreling of the workpiece is eminent knowing that the coefficient
of friction of the open die plate with the workpiece is 0.3. The
process takes 8 seconds to complete at a constant forging speed.
The strength coefficient of the workpiece C= 200 MPa and strain
rate sensitivity exponent m = 0.32. Calculate the...

In a bar drawing manufacturing process a2.0” long rod with a
diameter of 0.5” is pulled with a F=6000 lb. force.The diameter
decreases permanently to 0.4”.
Determine:
a.The final length of the rod
b.The true stress and strain at this load.
c. The engineering stress and strain at this load.
d. The stress at which necking occurs.
e. If the length just before necking occurs is 4.0 “ , find the
force at which necking occurs.
Strength coefficient k= 100...

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