Method and apparatus for detecting setting defects in...

Details Method and apparatus for detecting setting defects in... Method and apparatus for detecting setting defects in...

2005-11-08

2005-11-08

Bryant, David P. (Department: 3726)

Metal working

Method of mechanical manufacture

With testing or indicating

C029S716000

Reexamination Certificate

active

06961984

ABSTRACT:
In order to detect setting defects of a self-piercing rivet in a self-piercing rivet setting machine, on a graph having X-Y coordinates representing a rivet driven stroke and a rivet driving load, a normal upper limit curve37defining the upper limit of a normal setting range and a normal lower limit curve38defining the lower limit of the normal setting range are plotted to detect a conventionally detectable setting defects. Further, a defect upper limit curve39and a defect lower limit curve41which are obtained from an additional setting defect different from the conventionally detectable setting defects are plotted between the normal upper limit curve and the normal lower limit curve, so that the additional setting defect is detected when a plotted curve45of actual-measurement data of a rivet under a rivet driving operation lies between the defect upper and lower limit curves.

REFERENCES:
patent: 5533250 (1996-07-01), Ladouceur
patent: 6067696 (2000-05-01), Cecil et al.
patent: 6276050 (2001-08-01), Mauer et al.
patent: 6502008 (2002-12-01), Maurer et al.
patent: 6543115 (2003-04-01), Mauer et al.
patent: 0 738 550 (1996-10-01), None
patent: 0 893 179 (1999-01-01), None

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