Question
The percentage scrap in a sheet metal blanking operation of a continuous strip of sheet metal as shown in the figure is _______ (correct to two decimal places).
Answer :
53.25
This rectangle ABCD will be repeated again and again
At, = Total Area = 7D/5 * 6D/5 = 42D2/25
Au, =Area of blanking Disc = πD²/4
% of scrap = (At-Au)/At * 100% = [1-{(π/4)/(42/25)}] * 100% = 53.25 %
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