Condition of a shallow drawing operation : “The cup is no deeper than half its diameter” is the condition of a shallow drawing operation. Double action draw die: When the die is designed for a double action press with the blank holder fastened to the outer ram, which descends first and grip the blank then the die is known as double action draw die. The punch is fastened to the inner ram, which descends next to form the part. The cup may be pushed through the die or ejected back through the die by use of a knockout actuated by an air cushion. The knockout may also be used to hold the blank firmly against the punch nose during the punch operation.
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