The thickness of a sheet is reduced by rolling (without any change in width) using 600 mm diameter rolls

Q. The thickness of a sheet is reduced by rolling (without any change in width) using 600 mm diameter rolls. Neglect elastic deflection of the rolls and assume that the coefficient of friction at the roll-workpiece interface is 0.05. The sheet enters the rotating rolls unaided. If the initial sheet thickness is 2 mm, the minimum possible final thickness that can be produced by this process in a single pass is____mm (round off to two decimal places).

Ans: 1.25 m

Sol:
D = 600 mm

μ=0.05

h0=2mm

h_fmin=?

h0−h_fmin=μ²R

2−h_fmin=0.05²×300

h_fmin=1.25mm