Accession Number:

ADB026330

Title:

Development of a 30mm Frangible Projectile Crimper

Descriptive Note:

Final rept. Jun 1976-Jan 1977

Corporate Author:

AMRON CORP WAUKESHA WI

Personal Author(s):

Report Date:

1977-02-01

Pagination or Media Count:

66.0

Abstract:

The hydraulic crimping method used to assemble GAU-8A 30mm ammunition has been found unsuited for use with two projectile designs under development by AFATL. One of these, a plastic jacketed washer stack frangible target practice projectile, was chosen as the design-limiting case for the development of an alternative crimping method. A crimper designed to roll crimp plastic frangible projectiles into standard aluminum GAU-8 cartridge cases in such a manner that adequate projectile retention force is developed without structural damage to either the projectile or the cartridge case has been developed. The crimper consists of a cartridge holder mounted on a table under a rotary crimp head containing three pneumatically actuated crimp roller arms. Compressed air is metered into the air cylinder for gradual buildup of crimping force. On reaching a predetermined pressure, air in the cylinder is exhausted and the revolving crimp arms return to their original position. Two identical prototype crimping machines were fabricated to this design and ammunition assembled with them subjected to both static debulleting tests and Mann barrel firing tests. All design goals were met. Both prototypes include an air compressor to actuate pneumatic components, interlocked safety shields, and explosion-proof electrical components adequate for use in a laboratory ammunition loading environment.

Subject Categories:

  • Machinery and Tools
  • Ammunition and Explosives

Distribution Statement:

APPROVED FOR PUBLIC RELEASE