As a double action of forming or drawing operation takes place, the blank holder restrains the metal on its movement. During drawing operations, if the force is sufficient, the metal wrinkles. If the force is excessive, the metal tears. The part of a draw die which holds the workpiece against the draw ring to control metal flow. A blank holder is also called binder, binder ring, or ring. That part of a forming die, which holds the blank by pressure against a mating surface of the die to control metal flow and prevent wrinkling. The blank holder is sometimes referred to as hold down or binder area. Pressure applied by mechanical means, springs, air, or fluid cushions.
- Blank Holder