Common Data Question
A cup is to be drawn to a diameter of $70 m m$ with $35 m m$ depth from a $0.5 m m$ thick sheet metal. The cup is drawn in one operation. Assume $σ_{u} = 430 M P a$

The maximum drawing force is

Q. Common Data Question
A cup is to be drawn to a diameter of

70 m m

with

35 m m

depth from a

0.5 m m

thick sheet metal. The cup is drawn in one operation. Assume

σ_{u} = 430 M P a

The required blank diameter is

Q. 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

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A cup of 12 mm height and 6 mm diameter is to be made from a sheet metal of 2 mm thickness. The diameter of cup after third draw reduction will be: By assuming successive possible reductions of 50%, 30% and 25%.

The correct option is C 4.73 mmBlank diameter, D =√d2+4dh =√(6)2+4×6×12=18mm Cup diameter after 1st draw =18×0.5=9mm Second draw =9×(1−0.3)=6.3mm Third draw =6.3(1−0.25)=4.725mm

A cup of 12 mm height and 6 mm diameter is to be made from a sheet metal of 2 mm thickness. The diameter of cup after third draw reduction will be:
By assuming successive possible reductions of 50%, 30% and 25%.

The correct option is C 4.73 mm
Blank diameter, D $= \sqrt{d^{2} + 4 d h}$
$= \sqrt{(6)^{2} + 4 \times 6 \times 12} = 18 m m$

Cup diameter after 1st draw
$= 18 \times 0.5 = 9 m m$
Second draw
$= 9 \times (1 - 0.3) = 6.3 m m$
Third draw
$= 6.3 (1 - 0.25) = 4.725 m m$