Adhesive curing system and method for a hemming machine

F - Mech Eng,Light,Heat,Weapons – 16 – B

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F16B 11/00 (2006.01)

Patent

CA 2157699

A hemming machine for simultaneously bending a flange on a first panel into engagement with an edge portion of a second panel to form a hem, and at least partially curing an adhesive located in the hem. The flange bending members and/or the top surface of the panel support nest of the present invention are heated using electric cartridge heaters, hot oil, or electric heating cables, for example. During the hemming operation the nested panels are in constant direct contact with the panel support nest, and the heated flange bending members are in direct contact with the hem for approximately 3 to 6 seconds (dwell time is dependent on whether the die blocks are heated or if the die blocks are heating in conjunction with the top surface of the panel support nest), which is generally sufficient to at least partially cure the adhesive located in the hem, thereby reducing the incidence of panel shift during subsequent transfer through the manufacturing process using conveyors, racks etc. By combining the hemming and heating/curing operation of adhesive bonded hems into a single machine and operation, significant savings in machines and assembly time are realized.

Cette invention concerne une machine à rabattre le bord d'un premier panneau sur le bord d'un second panneau pour former un joint agrafé tout en polymérisant au moins partiellement un adhésif qui s'y trouve. Les matrices de pliage des bords et/ou la face supérieure du support de panneaux sont chauffées par des cartouches chauffantes électriques, des canalisations d'huile chaude ou des câbles électriques chauffants. Au cours de l'opération de rabattage, les panneaux déposés sur le support sont en contact direct constant avec celui-ci et les matrices de pliage chauffants sont en contact direct avec l'agrafure pendant environ 3 à 6 secondes (le temps de contact varie selon que seules les matrices sont chauffantes ou que les matrices et le support de panneaux sont tous chauffants), ce temps étant généralement suffisant pour une polymérisation au moins partielle de l'adhésif situé dans l'agrafure simple réalisée, ce qui réduit les risques de déplacement relatif des panneaux en cours de transfert vers d'autres postes de travail au moyen de transporteurs, chariots et autres moyens. En regroupant l'opération de rabattage des bords et la polymérisation thermique de l'adhésif dans une seule et même machine, on réalise d'importantes économies d'outillage et de temps d'assemblage.

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