Elemento funcional, pieza de ensamblaje que consta del elemento funcional y una pieza de chapa metálica así como procedimiento para la colocación de un elemento funcional

摘要

The functional element has a functional portion (16), a generally tubular rivet portion (20) and a ring-like sheet metal contact surface (22). The features of shape are provided at the free end and/or at the radially outer side and in the region adjacent to the free end of the rivet portion for co-movement of sheet metal portion (14) during the formation of rivet bead. An independent claim is also included for functional element attachment method.