Audi Ag

Heiko Hellmeier

Norbert Hornbostel

Frank Barkhausen

Frank Björn Barkhausen

A self-piercing rivet joint, having at least two components made of formable metallic materials having a strength up to 300 MPa, which are connected to one another in a riveting procedure, in which a self-piercing rivet pierces the first, stamp-side component with a setting force and is driven into the second, die-side component, specifically while maintaining a residual base thickness in the second component and while spreading out the self-piercing rivet to a spreading diameter in the second component. The self-piercing rivet is compressed after the riveting procedure down to 60% of its starting length and the spreading diameter is enlarged up to 140% to 150%, in particular to up to 140% of the rivet shaft diameter, specifically without damaging the self-piercing rivet by self-piercing rivet material cracks.

Self-piercing rivet joint and self-piercing rivet

A method for joining at least two parts to be joined which are arranged so as to overlap at least in a joining zone is disclosed using a joining element which is fed to the joining zone in a joining direction and which is designed so as to be free of undercuts at least in a shaft when seen opposite the joining direction. At least one first part to be joined that interacts first with the joining element in the joining direction, is punched by means of the joining element, and the joining element is pressed into a second part to be joined without punching through the second part. The shaft of the joining element is designed so as to be free of undercuts after being pressed into the second part to be joined and is arranged so as to contact the first and the second part to be joined with a radially applied force in a form-fit-free manner at least when seen opposite the joining direction.

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Heilbronn, Germany

Heiko Hellmeier