Question

In a rolling process, a sheet thickness is reduced by 10 mm using 800 mm diameter rolls. The roll strip contact length will be approximately

• A. 10 mm
• B. 64 mm
• C. 79 mm
• D. 127 mm

Answer 1

The correct option is B 64 mm

$$\Delta H=D(1-\cos \alpha )$$

$\Rightarrow \cos \alpha =1-\left(\frac{10}{800}\right)=0.9875$

$\Rightarrow \alpha =9.068{}^{\circ }=0.158$ radians

$\therefore$ Roll strip length, $L=R\alpha =400\times 0.158$
$=63.3mm$