Technical Briefs

Experimental Primer Seating-Stamping Tool Study in Small Caliber Cartridge Production

[+] Author and Article Information
Kevin Russell

Lyonel Reinhardt

 Armaments Engineering and Technology Center, US Army Research, Development and Engineering Center, Picatinny, NJ 07806lyonel.reinhardt@us.army.mil

J. Manuf. Sci. Eng 133(6), 064504 (Dec 22, 2011) (6 pages) doi:10.1115/1.4005312 History: Received July 06, 2011; Revised October 04, 2011; Published December 22, 2011; Online December 22, 2011

In an effort to produce a more secure assembly fit between the primer and the cartridge case in 5.56 mm combat ammunition, variants of the conventional case stamping tool were developed and incorporated in the small caliber ammunition manufacturing process (or SCAMP). The challenge is to develop a tool that provides a secure cartridge case-primer assembly fit while maximizing tool life. Two concept tool designs were realized—a concept four-prong triangular stamping tool and a concept four-prong wave stamping tool. This work compares the results of SCAMP trials using a concept four-prong triangular stamping tool, a concept four-prong wave stamping tool and the conventional circular stamping tool. Comparison data include cartridge case material movement after stamping, stamping tool stress distribution, stamping tool life, and stamping forces required to achieve the objective primer seating depths. Although the SCAMP trials are still ongoing, the findings to date show that the wave stamping tool has consistently met the design challenges of improved cartridge case-primer assembly fit and maximized tool life and is currently the leading candidate for implementation in SCAMP.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

5.56 mm M855 ball cartridge

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Figure 2

M16 (top) and M4 (bottom) rifles

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Figure 8

(a) 4-prong wave stamping tool, (b) rear view, and (c) cross-section view of stamped case

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Figure 9

Cartridge case stamping model (1/8th symmetry) in ABAQUS

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Figure 10

Von-Mises stress distributions in (a) triangular stamping tool and (b) wave stamping tool

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Figure 11

(a) Triangular tool after 10,000 cartridges and (b) wave tool after 475,000 cartridges

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Figure 3

SCAMP manufacturing stations

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Figure 4

Primer seating and case stamping operations

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Figure 5

5.56 mm M855 cartridges case with dropped primers

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Figure 6

(a) Circular stamping tool, (b) rear view, and (c) cross-section view of stamped case

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Figure 7

(a) 4-prong triangular stamping tool, (b) rear view, and (c) cross-section view of stamped case



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