A cup-shaped part is to be drawn without a blank holder


A cup-shaped part is to be drawn without a blank holder from sheet metal whose thickness = 0.25 in. The inside diameter of the cup = 2.5 in, its height = 1.5 in, and the corner radius at the base = 0.375 in.

(a) What is the minimum starting blank diameter that can be used, according to Eq?

(b) Does this blank diameter provide sufficient material to complete the cup?

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Civil Engineering: A cup-shaped part is to be drawn without a blank holder
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