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
• B. High blank holder pressure and high friction ; Reduce blank holder pressure and apply lubricant.
• C. High temperature causing increase in circumferential length ; Apply coolant to blank
• D. Buckling due to circumferential compression ; decrease blank holder pressure