Self-piercing rivet fastening device with improved die

Details Self-piercing rivet fastening device with improved die Self-piercing rivet fastening device with improved die

2005-06-27

2008-08-19

Tolan, Edward (Department: 3725)

Metal deforming

Tool and/or tool holder

C072S466500, C029S432200

Reexamination Certificate

active

07412869

ABSTRACT:
A self-piercing rivet fastening device has a punch that drives legs of the rivet into portions of workpieces that are forced into a die cavity, in order to join the workpieces. Particular surfaces of the die cavity are modified to increase the coefficient of friction in order to prevent tips of the legs of the rivet from breaking through a workpiece adjacent to the die and forming holes.

REFERENCES:
patent: 4040282 (1977-08-01), Saunders
patent: 5752305 (1998-05-01), Cotterill et al.
patent: 6269671 (2001-08-01), Zeiter et al.
patent: 6546613 (2003-04-01), Donovan
patent: 6842962 (2005-01-01), Blacket
patent: 6962469 (2005-11-01), Wang et al.
patent: 2004/0010903 (2004-01-01), Edwards
patent: 8505087 (1996-06-01), None

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