| 摘要 |
<p>A device for holding, in a braking manner, a preferably sheet-formed blank (31) when forming the blank in a fluid cell press. During the forming, a hydraulic forming pressure is applied, via an elastic diaphragm (4), to one side of the blank. The device comprises first means (18) for generating a hydraulic blank holder pressure and second means (15, 16, 17a) for supplying this pressure to a movable member (14) and maintaining this pressure. The movable member is adapted, as long as the blank holder pressure is maintained, to hold part of the blank in a braking manner against a support (13). To improve the forming result, the device comprises means (20) which, under the direct influence of the forming pressure, reduce the blank holder pressure when the forming pressure attains a predetermined value.</p> |
