**A cylindrical specimen of 75 mm height and 50 mm
diameter is cold forging into a final height of 36 mm. The flow
curve of the material is described of the parameters K = 350 MPa
and n = 0, 17 while the coefficient of friction is μ =
0.1.**

**(a) Calculate the piston force at start of machining,
intermediate heights of 62 mm and 49 mm and the final height of 36
mm. For the calculation, use the non-homogeneous deformation
approach but the coefficient of heterogeneity is given (by Groover)
by the relationship Qa = 1 + 0.4 μ D / h.**

**(b) Calculate the forging load to the final height of 36
mm by applying it friction hill method**

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