METHOD, RIVET-PUNCH, RIVET, ETC. FOR JOINING SEVERAL METAL SHEETS BY USING NON-HEAT-TREATING RIVETS MADE FROM AN ALUMINIUM ALLOY

摘要

The invention relates to a process (and product device) for a rivet assembly (50) of sheets (51, 52) by means of unannealed aluminum rivets manufactured from a harder alloy than AD rivets relatively soft alloy, commonly used; this process is characterized in that the expansion of the head to form at the end of the rod (58, 59) of the rivet during the riveting process, is controlled by a riveting (62) surrounding said etrémité (58, 59), first loosely. When approaching the expansion of the head diameter D = 1.5 d (d is the diameter of the rivet), that is to say, the limit beyond which occurs a break in the head, riveter (62) prevents further deformation and causes the separation of the material forming the head towards the central part of the rivet shank (57) which expands and enlarges the hole (53) sufficient to significantly extend the duration of riveted joint. Gradual tightening process from the end of the rod (58, 59) by means of riveting (62) makes it possible to perform the operation by hand. Can further improve the latter using a riveter (62) whose profile (67, 68, 69) is complementary to the contour of the end of the rod (58, 59).