Method and apparatus for vibration welding of thermoplastic...

B - Operations – Transporting – 29 – C

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B29C 65/06 (2006.01) B29C 65/00 (2006.01) B29C 65/02 (2006.01) B29C 65/78 (2006.01) E06B 3/968 (2006.01) B29C 65/08 (2006.01) E06B 3/96 (2006.01)

Patent

CA 2439552

Vibratory welded connections are formed between first and second members (32, 33) of thermoplastic material by interposing a junction piece (47) of similar material and vibrating the junction piece (47) at high speed while pressing the first and second members (32,33) in a controlled manner against opposite sides of the junction piece (47). Friction created by the vibration generates heat which melts a small amount of material at the engaging surfaces which upon cooling provides a strong welded joint having minimal flash. Entire frame systems such as window frames can be fabricated by an apparatus system (120) which forms a friction welded joint between adjacent ends of the frame members (134, 135, 136, 137). Furthermore the frame can be fabricated around a panel such as a glazing panel. The welded connections formed by the system do not mar the finish of the frame members and produce no unsightly flash bead requiring subsequent machining steps for its removal.

L'invention concerne des connexions soudées par vibration entre des premier et second éléments (32, 33) de matériau thermoplastique par interposition d'une pièce de jonction (47) de matériau similaire et mise en vibration de la pièce de jonction (47) à vitesse élevée tout en pressant les premier et second éléments (32,33) d'une manière contrôlée contre les côtés opposés de la pièce de jonction (47). La friction créée par la vibration produit de la chaleur qui fait fondre une petite quantité de matériau sur les surfaces d'engagement qui, au refroidissement, résulte en un joint robuste possédant un minimum de bavure. Il est possible de fabriquer des systèmes de cadre complet, notamment des cadres de fenêtres, à l'aide d'un système d'appareil (120) qui forme un joint soudé par friction entre des extrémités adjacentes d'éléments de cadre (134, 135, 136, 137). Le cadre peut, en outre, être fabriqué autour d'un panneau tel qu'un panneau de vitrage. Les connexions soudées formées par le système ne marquent pas le fini des éléments de cadre et ne produisent aucune boursouflure, désagréable à voir, nécessitant des étapes d'usinage supplémentaires pour leur enlèvement.

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