In wire-drawing operation, the maximum reduction per pass for perfectly plastic material in ideal condition is

Question

Question

This question was previously asked in

ESE Mechanical 2014 Official Paper - 2

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Answer 1

Concept:

The maximum reduction in cross-sectional area per pass (R) of a cold wire drawing process is

where n represents the strain hardening coefficient.

For perfectly plastic material, n = 0;

⇒ R = 1 – e-1

⇒ R = 63.2 %

Alternative Method:

For wire drawing drawing stress (σd) is given by

Ao = initial area, At = final area

For maximum reduction

(σd = σo) where ‘σo’ is the permissible stress