Answer:
punch and die sizes for the blanking operation = 59.54 mm
punch and die sizes for the punching operation = 28.456 mm
Explanation:
Given data:
aluminum alloy sheet thickness = 3.80 mm
outside diameter of the washer = 60.0 mm
inside diameter = 28.0 mm
the allowance is a = 0.06
To find:
punch and die sizes for the blanking operation = ?
punch and die sizes for the punching operation = ?
Calculation:
Since a = 0.06, the clearance is given by,
c = 0.06 (3.8) = 0.228 mm
(a) Blanking punch diameter = Db = 60 mm
= D(b) - 2c
= 60 - 2(0.228)
= 60 - 0.456
= 59.54 mm
(b) Punching punch diameter = D(h) = 15 mm
= Dh + 2c
= 28 + 2(0.228)
= 28 + 0.456
=28.456 mm
