In the deep drawing of cups, blanks show a tendency to wrinkle up around the periphery (flange). The most likely cause and remedy of the phenomenon are, respectively.
A
Buckling due to circumferential compression; Increase blank holder pressure
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B
High blank holder pressure and high friction; Reduce blank holder pressure and apply lubricant
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C
High temperature causing increase in circumferential length; Apply coolant to blank
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D
Buckling due to circumferential compression; decrease blank holder pressure
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Solution
The correct option is A Buckling due to circumferential compression; Increase blank holder pressure Buckling due to circumferential compression; Increase blank holder pressure