Method for the production of a semi-finished product for a...

B - Operations – Transporting – 21 – D

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B21D 53/78 (2006.01)

Patent

CA 2531793

A method for the production of a semi-finished product (13) for a wing-shaped element (15) having, in cross-section, a front edge (2), a rear edge (14) and an arched bottom wall (3) and an arched top wall (4) that extend some distance apart between the front edge (2) and the rear edge (14), comprises the following steps: bending the sheet (1) with the formation of two panels (3, 4) as well as a curved region (2) which the panels (3, 4) adjoin, placing a former (10) in the bent sheet (1) with the front edge of the former (9) positioned in the curved region (2), forcing the pressure member (8) towards a rubber cushion (7) with the bent sheet (1) enclosed between them and deforming said sheet between the former (10) and the rubber cushion (7), placing the shaped sheet (F) in a rubber press provided with a bottom block having a cavity (16) which has a shape that at least approximately corresponds to the external shape of one of the walls (3, 4) of the shaped sheet (P), pressing the shaped sheet (F) with former (10) between the bottom block (11) and a rubber mat (12), removing the semi-finished product (13) from the rubber press.

La présente invention concerne un procédé de production d'un produit semi-fini (13) destiné à un élément en forme d'aileron (15) définissant en plan de coupe, un bord antérieur (2), un bord postérieur (14), et une paroi inférieure cintrée (3) ainsi qu'une paroi supérieure cintrée (4) à une certaine distance entre le bord antérieur (2) et le bord postérieur (14). Ce procédé se décompose en plusieurs opérations: cintrage de la tôle (1) formant deux plans (3, 4) réunis par une zone cintrée (2); mise en place d'une forme (10) dans la tôle cintrée (1), le bord antérieur de la forme (9) se plaçant dans la zone cintrée (2); exercice d'une pression sur l'applicateur (8) vers un coussin de caoutchouc (7), la tôle cintrée étant prise entre les deux, et déformation de cette tôle entre la forme (10) et le coussin de caoutchouc (7); présentation de la tôle formée (F) dans une presse en caoutchouc dont le bloc inférieur présente une cavité (16) d'une forme correspondant approximativement au moins à la forme extérieure de l'une des parois (3, 4) de la tôle formée (P), exercice d'une pression sur la tôle formée (F) au moyen de la forme (10) entre le bloc inférieur (11) et un tapis de caoutchouc (12); retrait du produit semi-fini (13) de la presse en caoutchouc.

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