Features and developments July 12, 2005 The use of a draw
cushion in the lead-off press of a press line is recommended for
the production of high-quality parts to guarantee constant
quality through reproducible production parameters. The draw
cushion (also called the die or bed cushion) is one of the most
important parts of a single-action draw press. It has
considerable influence on part quality. The main function of the
cushion is to provide a flexible, controlled blank holder force,
which fixes the workpiece between the upper die and blank
holder. This force must be controlled precisely to guarantee
optimal material flow during the forming operation. The use of a
draw cushion in the lead-off press of a press line (see Figure
1) is recommended for producing consistently high-quality parts
through reproducible production parameters. The draw cushion for
mechanical presses has to be more powerful than for hydraulic
presses, because slide velocity is faster, and the slide impact
to the cushion is harder (see F