Question

A shell of $100$ mm diameter and $100$ mm height with the corner radius of $0.4$ mm is to be produced by cup drawing. The required blank diameter is

• A. $118$ mm
• B. $161$ mm
• C. $224$ mm
• D. $312$ mm

Answer 1

The correct option is C $224$ mm

Given, Shell diameter,
$d=100$ mm
Shell height,
$h=100$ mm
Corner radius,
$r=0.4$ mm
Here $d>20r$
$\therefore$ Blank diameter
$D=\sqrt{d^2+4dh}$
$=\sqrt{(100{)}^2+4\times 100\times 100}$
$=224$ mm