Self-piercing rivet and self-piercing riveting method and self-piercing riveted joint

Patent metadata

Field	Value
Publication number	US-10550873-B2
Application number	US-201715797636-A
Country	US
Kind code	B2
Filing date	Oct 30, 2017
Priority date	Dec 11, 2013
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

A riveted joint comprising: an upper workpiece and a lower workpiece, and a self-piercing rivet. The rivet in an undeformed state, before the creation of the riveted joint, included: a head defining a head diameter (DH); a shank defining a shank diameter (DS); and a foot end opposite the head. Radially outward at the foot end is a flat surface facing away from the head; and an axial recess located radially inward of the flat surface, partly defined in the foot end, open axially away from the head, and frustoconical in longitudinal cross section. The axial recess defining an axial depth (LB). The ratio of recess axial depth (LB) to shank diameter (DS) is less than 0.3. And in a deformed state, after the creation of the riveted joint, the rivet extends through the first workpiece and penetrates the second workpiece; and the head bears against the upper surface.

First claim

What is claimed is:

1. A self-piercing riveted joint comprising:
an upper workpiece and a lower workpiece, of which at least one is formed from a high-strength steel, and the upper workpiece has an upper side and a lower side, and the lower workpiece is located against the lower side of the first workpiece;
a self-piercing rivet which in an undeformed state, before the creation of the riveted joint, included:
a head defining a head diameter (DH);
a shank defining a shank diameter (DS) and including a foot end opposite the head, and radially outward at the foot end the shank further includes a flat surface section facing axially away from the head;
an axial recess located radially inward of the flat surface section, partly defined in the foot end of the shank, open axially away from the head, and frustoconical in longitudinal cross section; the axial recess defining an axial depth (LB); and
the ratio of axial depth (LB) of the recess to shank diameter (DS) is less than 0.3; and

wherein a deformed state, after the creation of the riveted joint, the self-piercing rivet extends through the first workpiece and penetrates the second workpiece; and the head bears against the upper surface of the upper workpiece.

2. The self-piercing riveted joint according to claim 1 , wherein the axial thickness (L 34 ) of the upper workpiece is at least equal to the axial depth (LB) of the self-piercing rivet's axial recess in the undeformed state.

3. The self-piercing riveted joint according to claim 1 , wherein a punched-out piece is detached from the upper workpiece ( 34 ), and less than 50% of the volume of the punched-out piece is located within the axial recess of the self-piercing rivet in the deformed state.

4. The self-piercing riveted joint according to claim 1 , wherein a punched-out piece is detached from the upper workpiece ( 34 ), and less than 25% of the volume of the punched-out piece is located within the axial recess of the self-piercing rivet in the deformed state.

5. The self-piercing riveted joint according to claim 1 , wherein the shank of the self-piercing rivet in the deformed state forms an undercut in relation to forces in the direction of the head, and the ratio of undercut ( 42 ) to shank diameter (DS) is at least one of smaller than 0.1 or greater than 0.01.

6. The self-piercing riveted joint according to claim 1 , wherein the ratio of the axial length (LR*) of the self-piercing rivet in the deformed state and the axial length (LR) of the self-piercing rivet in the undeformed state is at least one of greater than 0.8 or smaller than 0.95.

Assignees

• Newfrey Llc

Inventors

• Hofmann Steffen
• Bartig Paul
• Wilhelm Frank
• Wissling Matthias

Classifications

• F16B19/06

  Solid rivets made in one piece · CPC title

• F16B5/04

  by means of riveting (rivets F16B19/04) · CPC title

• F16B19/086 Primary

  Self-piercing rivets · CPC title

• B21J15/025

  Setting self-piercing rivets · CPC title

• F16H63/42

  Ratio indicator devices · CPC title