High-Speed Surface Flaw Inspection

Abstract

An optical surface flaw inspection monitor has been developed as a part of Frankford Arsenal's Cartridge Case Measurement Eject System for 5.56 mm small -caliber ammunition. This surface flaw monitor uses scattered light electro-optical instrumentation to detect flaw presence on 100% of the cartridge case surface at case throughput rates exceeding 1200 cases /minute. A line source formed from a laser source with cylindrical optics automatically tracks a spinning cartridge on the perimeter of a wheel -type mechanical handling system. Individual fiber optic elements located at each case position direct scattered light from surface zones of the case to common photomultiplier -based optical detectors. The detected signals are corrected for illumination and receiving optics transmissions and then frequency -processed. The frequency pattern of the detected scattered light relates directly to the type of surface flaw, such as dents and scratches. Go /no -go signals are fed directly to a minicomputer for implementation of a reject function on the mechanical handling hardware.

Filling Quality of Ammunition Production and Jet Motion in Defective Filling

“…Under different load and environment, energetic material may produce different damage. during the process of loading，they may produce various flaws such as shrinkage cavity, porosity , cracks , air bubble, microcrystalline, and the looseness between the grain and the projectile as well as the clearance between the grain and the shell bottom [1].…”