Sheet-Metal Ammunition Tray Stamping for Non-Flammable Storage
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Solution Overview
Problem
Conventional high-density polyethylene (HDPE) ammunition packing trays are prone to ignition during impact, leading to delayed cook-off reactions and posing a significant hazard to warfighters due to their flammability and potential for prolonged burning without visible smoke, which can deceive personnel about the safety of the stowage container.
Innovation Solution
A non-flammable sheet metal ammunition tray is developed using aluminum, stamped with interleaving parallel cutouts and reinforced with steel components, employing upper and lower dies, binders, and bolsters to apply compressive force, ensuring the tray is stiffer and safer while maintaining comparable weight to HDPE trays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional HDPE trays are used for ammunition packaging, then the trays are lightweight and easy to manufacture, but they are prone to ignition during impact and pose fire hazards
Solution Approach 1:
The patent changes the material parameter from HDPE plastic to aluminum metal, fundamentally altering the chemical composition and physical properties of the tray material. This substitution eliminates the flammability issue inherent in polyethylene while providing a non-combustible alternative that meets safety requirements for ammunition packaging.
Solution Approach 2:
The invention employs a composite construction combining aluminum sheet metal with integrated steel components (bolsters, binders, and die structures). This composite approach leverages the non-flammable properties of aluminum while incorporating steel elements to provide enhanced structural rigidity and impact resistance, creating a multi-material solution that addresses both safety and durability concerns.
2Reliability
If sheet metal is used to replace HDPE trays, then the trays become non-flammable and safer, but the manufacturing process becomes more complex requiring dies, binders, and bolsters
Solution Approach 1:
The stamping apparatus is divided into distinct functional segments: upper and lower dies for shaping, binders for clamping and positioning, and bolsters for applying compressive force. This segmentation allows each component to perform its specific function independently, making the complex manufacturing process more manageable and easier to maintain while ensuring reliable production of safe aluminum trays.
Solution Approach 2:
The stamping apparatus is designed as a multi-functional integrated system where the dies, binders, and bolsters work together in a single operation to complete the entire tray forming process. The binders serve multiple purposes including clamping the material, positioning the tray during stamping, and providing structural support during the forming operation, thereby reducing the need for separate dedicated components for each function.
3Strength
If aluminum sheet metal is stamped into trays, then the trays become stiffer and more reusable, but the manufacturing process requires compressive force application
Solution Approach 1:
The bolsters are positioned and pre-loaded with compressive force before the stamping operation begins. This preliminary application of force ensures that the aluminum sheet metal is properly supported and restrained during the forming process, preventing unwanted deformation and ensuring that the compressive force is optimally distributed throughout the tray structure to achieve the desired stiffness.
Solution Approach 2:
The stamping process utilizes curved and contoured die surfaces that gradually form the aluminum sheet into the final tray shape with integrated cutouts and reinforced structures. The curvature of the die faces distributes the compressive force more evenly across the material, preventing stress concentrations and enabling the formation of complex geometries that enhance tray stiffness and structural integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The aluminum tray eliminates the risk of combustion, providing improved safety and stability for ammunition storage, as it does not combust like HDPE trays, and is stiffer and more reusable, reducing the risk of round spilling and maintaining logistical weight constraints.
Implementation Method 1
The shop press applies compression to the bolsters for stamping the template by the dies into the ammunition tray
Implementation Method 2
stamping the template by the dies into the ammunition tray
Data Source
AI summary
A stamping apparatus is provided for producing an ammunition tray from metal sheet template with interleaving parallel cutouts in conjunction with a shop press. The apparatus includes upper and lower tray dies, upper and lower binders, and a pair of bolsters. Each die has opposite external and internal sides. The external side has a depression pocket. The internal side has a die impression to shape the template. Each binder has a cavity. The tray dies are disposed between the binders. The bolsters are disposed for engaging the shop press to apply compressive force. Each bolster correspondingly inserts through the cavity and into the depression pocket. The template is disposed between lower and upper internal sides of respective the dies. The shop press applies compression to the bolsters for stamping the template by the dies into the ammunition tray.