This paper, describes an eddy current system developed to detect cracks, splits, and folds in 5.56 mm cartridge cases at a rate of 1200 cases/minute. The system inspects each cartridge case around its entire circumference, and has an operating frequency of 100 kHz which minimizes sensitivity to wall thickness variations. Also discussed in this paper is the use of this instrument to monitor cartridge case wall thickness by reducing the operating frequency. At a frequency of 25 kHz, wall thickness can be measured with an accuracy of 0.013 mm (0.0005 in.). Maximum, minimum, and average wall thickness are simultaneously recorded for each case about its circumference at four different locations on the case.
An eddy current system for high-speed inspection of M-16 cartridge cases
Ein Wirbelstromsystem zum schnellen Pruefen von M-16-Geschosshuelsen
Materials Evaluation ; 39 , 4 ; 396-400
1981
5 Seiten, 11 Bilder
Aufsatz (Zeitschrift)
Englisch
On-line automatic high speed inspection of cartridge cases
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