Ignition Mechanisms of Polymer Bonded Explosives during Drilling

R. Clark, A. A. Neuber, R. J. Lee, A. T. Hewitt, T. Buntin, D. Barnett, J. C. Dickens, W. A. Harrison, E. Tucker, J. J. Mankowski

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

The drilling behavior of polymer bonded high explosives (HE) is investigated by varying drilling parameters and analyzing resultant forces and thermal response. A modified drill press enables remote operation and precise control of cutting speed, feed, and depth. To acquire temperature at the cutting interface a K-Type thermocouple is inserted in the coolant holes of thru-coolant drill bits and epoxied flush with the drill's flank face, which yielded a sensing accuracy of ±1°C and a resolution of 0.48°C. Cutting forces and torques are acquired with a sampling speed of up to 2,000 Hz. The comparison of downward directed forces across cutting operations is indicative of which speed and feed rate combinations limit excessive stressing of the HE, while cutting axis torques give indication in the case of drilling obstructions such as insufficient chip clearance. Drilling conditions in excess of the existing US DOE-STD-1212-2012 limitations are tested to determine safe but efficient machining limits for these materials. Drilling speed, feed rate, and peck depth are varied for drilling cycles with a 5 mm diameter drill bit, and further cycles are performed to determine the effect of increasing cut diameter. In peck drilling, clearance of chip from the drill flute is crucial and governs the drill's temperature rise.

Original languageEnglish
Title of host publication2019 IEEE Pulsed Power and Plasma Science, PPPS 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538679692
DOIs
StatePublished - Jun 2019
Event2019 IEEE Pulsed Power and Plasma Science, PPPS 2019 - Orlando, United States
Duration: Jun 23 2019Jun 29 2019

Publication series

NameIEEE International Pulsed Power Conference
Volume2019-June
ISSN (Print)2158-4915
ISSN (Electronic)2158-4923

Conference

Conference2019 IEEE Pulsed Power and Plasma Science, PPPS 2019
Country/TerritoryUnited States
CityOrlando
Period06/23/1906/29/19

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