| 摘要 |
<p>A cushioning apparatus for applying a blank-holding force to a pressure member (28) to hold a blank (40) on a press, through hydraulic cylinders (30) on a cushion platen (26) biased by a force generating device (42), and cushion pins (22) linked with the cylinders and supporting the pressure member, the blank-holding force being based on a biasing force generated by the force generating device, and controllable by a controller (56, 70) through a flow regulator (68, 76, 78, 82, 84, 86, 88, 94) provided in a discharge line (66, 92) for discharging the fluid from the cylinders, such that the controller controls the flow regulator to discharge the fluid from the cylinders during a pressing action on the blank by upper and lower dies (18, 10), for thereby controlling the cylinder pressure according to a predetermined pattern of change in the pressure in relation to a downward movement of the upper die. The hydraulic cylinders may be classified into two or more groups connected to mutually independent discharge lines. The cylinder pressure may be optimized by disclosed methods and devices. <IMAGE></p> |
