Question

In a rolling operation using rolls of diameter 500 mm if a 25 mm thick plate cannot be reduced to less than 20 mm in one pass, the coefficient of friction between the roll and the plate is

Answer 1

D = 500 mm; R = 250 mm

$(\Delta h{)}_{max}={\mu }^{2}R;5={\mu }^2\times 250$

5/250 = ${\mu }^2$

or $\mu =0.1414$