A device for holding a blank in a fluid cell press and a...

B - Operations – Transporting – 30 – B

Patent

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B30B 5/02 (2006.01) B21D 22/22 (2006.01)

Patent

CA 2309608

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.

L'invention concerne un dispositif permettant de maintenir, par la voie du freinage, un flan (31), de préférence en forme de feuille, au cours de son façonnage dans une presse à cellule remplie de fluide. Au cours de ce façonnage, une pression de façonnage hydraulique est appliquée, par l'intermédiaire d'un diaphragme élastique (4), à l'un des côtés de ce flan. Ce dispositif comporte un premier ensemble (18) destiné à générer une pression hydraulique de maintien du flan et un second ensemble (15, 16, 17a) destiné à appliquer cette pression à un élément mobile (14) et à maintenir cette pression. Cet élément mobile est conçu, tant que la pression de maintien du flan est maintenue, pour maintenir une partie du flan par la voie du freinage contre un support (13). En vue d'améliorer ce façonnage, ce dispositif comporte un organe (20) qui, sous l'influence directe de la pression de façonnage, réduit la pression de maintien du flan lorsque celle-ci atteint une valeur prédéterminée.

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