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Calculate Size of Blank Required for Drawing
A flanged cup shown in Figure is to be produced by deep drawing. Calculate the size of the blank required for drawing.
Material : Al
Sheet Thickness : 1.5 mm
All dim. in mm
Solution
Neglecting sheet thinning/thickening,
Area of flanged cup = Area of blank
The cup shape is divided into 3 primitives as under
Annular Disc
Area
A1 = ∏/ 4 (152 - 102 )
= 125 ∏ /4 mm2
Cylindrical Part
Area A2 = ? DL
= ? × 10 × 8 = 80 ? mm2
Circular Disc
Area A3 = ∏ / 4 D2
= (∏ /4 )× 100 mm2
Area of flanged cup
A = A1 + A2 + A3
= 545 ∏ / 4
= 545/4 ∏
Diameter of blank, Db = √545
= 23.35 mm
Diameter of blank can be chosen to be 25.00 mm to account for material properties, die clearances and trimming allowances.
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