40mm Infantry Grenade Fuzes
54th Annual Fuze Conference
«The Fuzing Evolution – Smaller, Smarter and Safer»
Michael BUTZ
Product Management Kansas City, MO - May 11-13, 2010
JUNGHANS Microtec
May 2010
A Diehl and Thales Company
Outline
40mm Fuzes
Company Presentation
Program Background, Application
Requirements for DM431A1
Overview of JUNGHANS 40mm Products
Overview of the Cartridges and Fuzes
DM431A1 IG HV fuze family
DM431A1 - Fuze Design
Fuze Functioning Modes
Arming Criteria
Safety and Reliability
Trial Results
Conclusion
May 2010 2
A Diehl and Thales Company
Company Presentation
A global leader in the field
of ammunition fuzes
and S&A devices
Full range of products
Key competencies in
Fuzing technologies
Micro-technologies
Ammunition electronics
May 2010 3
A Diehl and Thales Company
Program Background, Application
40mm Fuzes
Increasing intensive military action in urban terrain and a move to
asymmetric combat situations triggered demand for other types of
guns and ammunition for those situations
German Army required a 40mm IG HV fuze with SD mode
Selection of US M549 design as basis
Improvement of the M549 PD fuze into DM431A1 PDSD fuze
September 2002: First serial production contract
Following the successful completion of the development phase the
DM431A1 fuze was already presented at the Fuze Conference in 2003
May 2010 4
A Diehl and Thales Company
Program Background, Application
40mm Fuzes
The DM431A1 fuze is in serial production since 2003
Both DM441 and DM451 fuze are now entering the international
markets
DM431A1 Customer: Diehl BGT Defence – End users: GER, NOR,
ITA, IRE, LV, NL, PL
DM441 Customer: Hellenic Defence – End users: GRE, FRA, QATAR
DM451 Customer: Diehl BGT Defence – End user: GER
May 2010 5
A Diehl and Thales Company
Program Background, Application
40mm Fuzes
AGL 40mm from Heckler &
Koch
H&K AGL mounted on
German Vehicle FENNEK
May 2010 6
A Diehl and Thales Company
Program Background, Application
40mm Fuzes
Maximum range with integrated SD mode is 1.800m
The German Army requirement is between 100m and 1.500m combat
distance
Effect against point targets
Requirements
Effect against area targets
May 2010 7
A Diehl and Thales Company
Requirements for DM431A1
40mm Fuzes
STANAG 4157; STANAG 4187
MIL-STD-331B; MIL-STD-1316B; MIL-STD-810E
Overall functional Reliability ≥ 97%
Functioning Temperature: -46 C to +63 C
Storage Temperature: -54 C to +71 C
May 2010 8
A Diehl and Thales Company
Overview of JUNGHANS 40mm Products
40mm Fuzes
40mm Low Velocity
DM411A1
DM361
40mm High Velocity
DM431A1
DM441
DM451 (IM)
May 2010 9
A Diehl and Thales Company
Overview of Cartridges and Fuzes
40mm Fuzes
Low Velocity: DM411A1 and DM361
JUNGHANS has produced many thousands
LV-fuzes
Technical Information:
Muzzle safety distance (v0=78m/s): 8m
Arming distance: 15m
Arming set back: 2.000g
Arming rotation: 2.300rpm
Functioning temperature: -35°C to +50°C
SD time (in the temperature range): >8s
Weight: ~50,5g
May 2010 10
A Diehl and Thales Company
Overview of Cartridges and Fuzes
40mm Fuzes
High Velocity Cartridges in Service
Fuze DM431A1 Fuze DM441 / DM451
DM111 HE-PFF (Diehl) DM42 HEDP (e.g. Diehl)
High Explosive Pre-Formed Fragments High Explosive Dual Purpose
Fuze
Projectile
Propellant
May 2010 11
A Diehl and Thales Company
DM431A1 IG HV fuze family
40mm Fuzes
DM431A1 IG HV and Variations
Background:
Mechanical point detonating fuzes equipped with a pyrotechnic
self-destruct mechanism
Technical Information:
Muzzle Safety Distance ≥ 18m
Arming Distance ≤ 40m
Arming set back: 22.500g
Arming rotation: 6.500rpm
Functioning Temperature: -46 C to +63 C
Storage Temperature: -54 C to +71 C
SD time (in the temperature range): >14s
May 2010 12
A Diehl and Thales Company
DM431A1 IG HV fuze family
40mm Fuzes
DM431A1 IG HV
PDSD fuze on HE-PFF (high explosive
pre-formed fragments) round
To date, JUNGHANS has produced some
1 million DM431A1 fuzes
Reliability rate 99,7% based on the
results of the lot acceptance firings, in
summary more than 7.400 rounds
May 2010 13
A Diehl and Thales Company
DM431A1 IG HV fuze family
40mm Fuzes
DM441 IG HV
Used for HEDP ammunition on the DM32
round
For use against soft targets and light armored
vehicles
Penetration performance of more than 70mm
armor steel
More than hundred thousand fuzes DM441
have been produced
May 2010 14
A Diehl and Thales Company
DM431A1 IG HV fuze family
40mm Fuzes
DM451 IG HV
Latest addition to JUNGHANS 40mm
fuzes
Used for insensitive HEDP ammunition on
the DM42 round
Pilot lot acceptance in approval by GER
Serial production in progress
With insensitive spit back booster
DM1603 (IM) and black ogive
For use against soft targets and light
armored vehicles
High penetration performance of more
than 70mm armor steel, high effectivity
and robustness
May 2010 15
A Diehl and Thales Company
DM431A1 – Fuze Design
40mm Fuzes
Fuze Description in safe position
Firing pin
Percussion pin
Escapement Stab detonator
DM1518
Safety spring
Rotor
Delay detonator
DM1519
Booster DM1515
Set-back device
May 2010 16
A Diehl and Thales Company
DM431A1 – Fuze Design
40mm Fuzes
Fuze description - integration of the SD mode
Housing
Percussion pin
Delay detonator
DM1519
May 2010 17
A Diehl and Thales Company
Fuze Functioning Modes
40mm Fuzes
Fuze Functioning Modes are:
Impact mode (PD-mode)
Pyrotechnical self-destruct function
Evaluation of Fuze Functioning Modes within Lot Acceptance Firings:
Muzzle safety: target plate at 18m
PD function: target plate at 40m
Impact sensitivity: target plate with 70°NATO angle at 100m
Impact sensitivity: firing on soft ground at 300m
SD firing with AGL (according to German standards)
Lot acceptance firings are conducted according to high German
standards
May 2010 18
A Diehl and Thales Company
Arming Criteria
40mm Fuzes
STANAG 4187 Compliance
The fuze has two independent safety features.
1. acceleration-dependent safety elements: two setback springs
2. rotation-dependent safety element: safety spring
A mechanical delay mechanism guarantees the muzzle safety
distance
No manual manipulation possible due to closed fuze housing
No stored energy for rotor movement prior to launch
No duds due to self-destruct mode
May 2010 19
A Diehl and Thales Company
Safety and Reliability
40mm Fuzes
Why SD-mode ?
Very high reliability rate (calculated with the results of the lot
acceptance firings) of 99,7% with all firings conducted on the
specified ground / targets
SD mode prevents (hazardous) duds in case of not specified target
impact conditions:
High grass or bush
Snow
Water
Angle >70° NATO or ricochet
May 2010 20
A Diehl and Thales Company
Trial Results
40mm Fuzes
DM431A1 – Firing against 3mm steel plate at 70°NATO
May 2010 21
A Diehl and Thales Company
Trial Results
40mm Fuzes
DM431A1 – Firing against 2mm plate at arming distance 40m
May 2010 22
A Diehl and Thales Company
Trial Results
40mm Fuzes
DM451 HEDP – Pilot lot acceptance trials in GER
Disciplines performed for this acceptance:
Dispersion pattern
Weapon function
Penetration performance: Firing against 70mm armor steel plate
(in addition towards HE-PFF round)
Muzzle safety: target plate at 18m
PD function: target plate at 40m
Impact sensitivity: target plate with 70°NATO angle at 100m
Impact sensitivity: firing on soft ground at 300m
SD firing with AGL (according to German standards)
Strongly convincing performance of the DM42 round with the DM451
fuze from JUNGHANS
May 2010 23
A Diehl and Thales Company
Trial Results
40mm Fuzes
DM451 HEDP – Firing against 70mm armor steel plate
Complete Penetration
of the ammunition
May 2010 24
A Diehl and Thales Company
Conclusion
40mm Fuzes
JUNGHANS is offering very safe and reliable IG fuzes which fully meet
the latest safety requirements of major international customers and
different IG solutions for asymmetric combat situations
JUNGHANS demonstrates an unmatched live firing reliability today on
the IG market
JUNGHANS, thanks to its background and technology in fuzing
solutions is also considering new solutions for the future in the domain
of IG fuzes
JUNGHANS focusses on Safety, Quality and Reliability to provide
customers with flexible solutions for improved operational efficiency
May 2010 25
A Diehl and Thales Company
40mm Fuzes
JUNGHANS Microtec GmbH
Thank you for your kind attention!
Michael BUTZ
Product Management
JUNGHANS Microtec
GERMANY
michael.butz@junghans-microtec.de
May 2010
A Diehl and Thales Company
