| 摘要 |
The pressure control means is adapted to operate in timed relationship with axial movement of the punch and is operatively connected with the blank holder. This ensures that during the draw stroke of the punch, the blank holding pressure varies according to a continuous characteristic: increasing over a first part of the draw stroke to a max. value and decreasing over the remainder of the stroke to a relatively low value (or substantially zero) at the end of the stroke. |
