Method for joining two objects and corresponding joining...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 65/60 (2006.01) B29C 65/08 (2006.01) F16B 5/08 (2006.01) F16B 13/14 (2006.01)

Patent

CA 2572979

A first and a second object (1 and 2) are joined with the aid of a joining element (8) comprising at least in the region of its distal and proximal ends (8.1 and 8.2) a thermoplastic material. Two blind holes (5 and 6) facing each other are provided in the two objects (1 and 2) and the joining element (8) is positioned in the blind holes such that its distal and proximal ends (8.1) are in contact with the bottom faces of the blind holes and such that there is a gap (9) between the two objects (1 and 2). This assembly is then positioned between a support (3) and a sonotrode (4). The sonotrode (4) and the support (3) are forced towards each other, while the sonotrode (4) is vibrated, thereby liquefying at least part of the material having thermoplastic properties, there, where the joining element ends (8.1 and 8.2) are pressed against the bottom faces of the holes (5 and 6) and allowing the liquefied material to infiltrate into pores of the hole surfaces or unevennesses or openings provided in the hole surfaces, such anchoring the joining element ends (8.1 and 8.2) in the objects (1 and 2). For achieving suitably similar anchorage qualities at the two joining element ends (8.1 and 8.2), the distal end (8.1) of the joining element (8) has a smaller face area and comprises less thermoplastic material than the proximal end (8.2) of the joining element.

L'invention concerne un premier et un second objets (1, 2) assemblés à l'aide d'un élément d'assemblage (8) comprenant au moins un matériau thermoplastique au niveau de la région de ses extrémités distale et proximale (8.1, 8.2). Deux trous borgnes (5, 6) opposés l'un à l'autre sont ménagés dans les deux objets (1, 2) et l'élément d'assemblage (8) est positionné dans lesdits trous borgnes de sorte que ses extrémités distale et proximale (8.1) sont en contact avec les faces inférieures des trous borgnes et qu'il existe un espace (9) entre ces deux objets (1, 2). Cet ensemble est ensuit positionné entre un support (3) et un sonotrode (4), lesdits sonotrode (4) et support (3) étant forcés l'un vers l'autre pendant que le sonotrode (4) vibre, ce qui permet de liquéfier au moins une partie du matériau présentant des propriétés thermoplastique. Les extrémités des éléments d'assemblage (8.1, 8.2) sont pressées contre les faces inférieures des trous (5, 6) et permettent au matériau liquéfié de s'infiltrer dans les pores des surfaces trouées ou dans les irrégularités ou les ouvertures ménagées dans lesdites surfaces trouées, ce qui permet d'ancrer les extrémités des éléments d'assemblage (8.1, 8.2) dans les objets (1, 2). Pour obtenir des qualités d'ancrage appropriées similaires au niveau des extrémités des éléments d'assemblage (8.1, 8.2), l'extrémité distale (8.1) de l'élément d'assemblage (8) est doté d'une zone de surface plus petite et comprend moins de matériau thermoplastique que l'extrémité proximale (8.2) de l'élément de liaison.

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