Bollhoff Verbindungstechnik Gmbh

Dennis Henke

Andreas Marxkors

Mathias Heger

Franz Ferdinand Menne

Daniel Junklewitz

Holger Thommes

Andreas Jakobsche

Sergej Erbis

Tim Flügge

Franz-Ferdinand Menne

A semi-hollow punch rivet by which a joint is establishable. The rivet includes: a rivet head having a rivet shaft, which comprises a lateral surface, a rivet foot having a foot front surface is provided at an end of the rivet shaft facing away from the rivet head, the foot front surface is perpendicular to a longitudinal axis Lof the rivet shaft, and a bell-like shaft cavity extends into the rivet shaft beginning at the end facing away from the head. The shaft cavity is formed by: an inlet portion beginning at a radial inner side of the foot front surface and extending arc-shaped with an inlet radius Rin the direction of the rivet head, a linearly extending continuation portion into which the inlet portion transitions tangentially and which is arranged in an acute angle with respect to the lateral surface, and a final dome portion.

Semi-hollow punch rivet, a punch rivet joint of at least two components by means of a semi-hollow punch rivet as well as a method for connecting the components with the semi-hollow punch rivet

A self-piercing rivet for producing a joining connection between at least two components, which comprises the following features: a rivet head and a rivet shank having a central shank bore, wherein the rivet shank comprises a cylindrical shank outer surface and a shank inner surface limiting the central shank bore, and wherein the shank outer surface and the shank inner surface are connected at the axial end of the rivet shank facing away from the rivet head by a flat shank end face and a shank end radius. The shank end radius transitions tangentially into the shank inner surface and the flat shank end face is connected to the shank outer surface by a cutting edge.

Self-piercing rivet

The inventive installation tools are adapted to a wire thread insert comprising a cylindrical coil with a plurality of helically wound windings of a wire and a driving tang with a moving notch protruding into an interior of the coil via a bending portion. The installation tool has the following features: a rotatable mounting spindle with a driving end for rotating the installation spindle and a functional end for installing the wire thread insert, wherein the functional end comprises at least one turn that is length-reduced in the circumferential direction and that has, at a first end, a driving edge for engagement into a moving notch of the wire thread insert and, at a second end, a bend-up-shoulder for bending the driving tang of the wire thread insert radially outwardly.

Installation tool for a wire thread insert having an installation pin that can be bent back, and installation method

A semi-tubular self-piercing rivet having a rivet head and a rivet shaft, the shaft bore of which satisfies the following relationship in relation to the length of the semi-tubular self-piercing rivet: the total length of the self-piercing rivet Lbeing &#x2264;4 mm. The disclosure further relates to a corresponding self-piercing rivet joint, to a method for producing the self-piercing rivet, and to a method for producing the self-piercing rivet joint.

Semi-tubular self-piercing rivet for thin sheet metal joints, method for producing said semi-tubular self-piercing rivet, and method for producing a joint

A self-piercing riveting die for a setting device, by which a self-piercing riveting connection in a plurality of components is establishable by forming a closing head. This self-piercing riveting die may include a main body with an upper side and a recess arranged rotationally symmetrically to the central axis of the self-piercing riveting die formed therein. In the cross-section of the self-piercing riveting die, the recess has a demolding inclination of the demolding section, which radially transitions via a step into a circular arc-shaped lowering of the annular channel section, wherein the circular arc-shaped lowering radially inwardly rises straight-lined or circular arc-shaped or curvilinearally to the die bottom.

Self-piercing rivet die

The present disclosure provides an adjustment aid for a joining device having a punch and a counter-tool which can be oriented coaxially to one another and can be moved axially towards each other for a joining movement relative to one another. Furthermore, the present disclosure provides a method for adjusting a joining device with a punch and counter-tool. A grid marking is embossed in a reshaped test part with the assistance of an embossable grid marking on a punch surface or on a counter surface of the counter-tool. This grid marking is evaluable in comparison to the discernible impressions of the punch surface and counter surface of the counter-tool.

Growing community of inventors

Rheda-Wiedenbrück, Germany

Dennis Henke