Method and device for fastening an auxiliary joining element...

B - Operations – Transporting – 23 – P

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B23P 19/06 (2006.01) B21D 39/06 (2006.01) B21J 15/02 (2006.01) F16B 37/06 (2006.01)

Patent

CA 2374217

The invention relates to a method and a device for fastening an auxiliary joining element (2) to a sheet-shaped work piece (3). Said auxiliary joining element (2) is forced from one side into the work piece (3) with its base and deforms said work piece to a pot-shaped structure. The device is provided with a male mold (9) and a female mold (15) to deform the work piece. To this end, the base interacts with the work piece (3) to form an undercut, said undercut being limited to predetermined dimensions. The female mold is provided with a recess (19) with wall sections that are positioned on levers (22). Said levers (22) are displaced to a working position when pressure is applied in the direction of pressure (14). Said levers can be locked in the working position and form undercut sections (26). The levers are displaced to a release position when the unit consisting of the work piece (3) and the auxiliary joining element (2) is displaced opposite to the direction of pressure (14) to a release position, whereby the undercut sections (26) are completely released.

Procédé et dispositif permettant de fixer un élément d'assemblage auxiliaire (2) à une pièce en tôle (3). Selon ledit procédé, l'élément d'assemblage auxiliaire (2) est ajouté par sa base depuis un côté dans la pièce (3) et déforme cette dernière en forme de pot. A cet effet, ledit dispositif comporte un poinçon (9) et une matrice (15). La base forme avec la pièce (3) une contre-dépouille qui est limitée à des zones périphériques prédéterminées. A cet effet, la matrice possède un évidement (19) doté de secteurs de paroi qui sont placés à proximité de leviers (22). Lesdits leviers (22), qui sont mobiles sous l'effet d'une pression exercée dans le sens de pression (14) vers une position de travail, peuvent être fixés dans ladite position et forment des zones (26) de contre-dépouille. Ces leviers sont mobiles par un mouvement de l'unité constituée de la pièce (3) et de l'élément d'assemblage auxiliaire (2) dans le sens inverse au sens de pression (14) vers une position de dégagement dans laquelle les zones (26) de contre-dépouille sont complètement dégagées.

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