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Question

A blank of 50mm diameter is to be sheared from a sheet of 2.5mm thickness. The required radial clearance between the die and the punch is 6% of sheet thickness. The punch and die diameter (mm) for this blanking operation respectively are

A
50.00and50.30
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B
50.00and50.315
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C
49.70and50.00
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D
49.85and50.00
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Solution

The correct option is C 49.70and50.00
Radial clearance=6100×t
6100×2.5=0.15mm>0.1
Total clearance =2×0.15=0.3 mm
Dia of die = Dia of blank = 50 mm
Dia of punch = Dia of die - clearance
=500.30=49.70 mm

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