15 November 2021
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Bolhoff extends self-piercing rivet product range

Bolhoff has extended its self-piercing rivet technology, the Rivset HDZ, for joining high-strength steels.

It says: “Self-pierce riveting with semi-tubular rivets is an established mechanical joining method to create high-strength joints from similar (for example aluminium with aluminium) as well as dissimilar materials (for example steel and aluminium). Apart from the classic two-layer joints, joints with three or more layers can also be created. They stand out due to their high static and dynamic strength.”

It continues: “Within the context of modern lightweight construction and the related use of material ranging from aluminium to ultrahigh-strength steels, there is a growing material diversity. This leads to higher requirements for the joining technology so that a great number of rivet geometries have been developed over time.

“This greater number of rivet variants in turn increases the complexity and reduces the flexibility. Our established self-pierce riveting technology thus had to be correspondingly developed further beyond its tried-and-tested technology limits. The objective: the development of a rivet which is suited for universal use to join ultrahigh-strength steels.”

It says that the Rivset HDZ allows to join most diverse steel grades including ultrahigh-strength steels (> 1,500 MPa) with dissimilar materials such as aluminium. “This flexibility is primarily achieved through the conical hole geometry. In combination with the hole bottom with optimised flux of force, the HDZ rivet is so highly stable that already in hardness grade H4 the joining of press-hardened steels is possible. Moreover, the grade H6 HDZ rivet also qualifies for joining press-hardened steels with greater sheet thicknesses,” the company adds.

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