Rivet : the metal sheets now are permanently fastened together with the flush self-pierce rivet in place (the rivet, being the same length as the total thickness of the materials being joined, takes the place of the pierced section)įlush : the joint is locked tight and the rivet is flush with both surfaces of the assembly Set: the upper tooling pushes and shears the metals through the lower dieĬoin : the metal slugs pass through the lower die tooling and the self-piercing rivet is positioned (the head on the top and the coining ring on the lower die tooling are forced around the self-piercing rivet to permit the sides of the pierced hole to flow into and form around the concave section of the rivet) Punch : after the metals are compressed together a special self-piercing punch tool drives a self-piercing rivet into the top piece of metal and begins to push the self-piercing rivet through The flush self-pierce riveting process is often an alternative to spot welding or clinching when those permanent assembly processes are not possible / not optimal for the fastening characteristics required.įlush self-pierce rivet machines built by Orbitform perform the fastening operation via a punch and die method which automatically feeds, punches, inserts and locks the self-piercing rivet in place to produce a solid joint in a single cycle operation. The flush self-pierce riveting process is used when there is a need to join dissimilar metals, when the metals being fastened have varying thicknesses, if pre-painted metal materials are to be joined, and/or if pre-coated materials are required to be fastened together. Flush self-pierce riveting is a metal assembly process used to join two or more metals together.
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