Plated Powder-Core Projectile Manufacturing Method
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Solution Overview
Problem
The existing methods for producing powder core projectiles in firearm ammunition result in significant loss of core material during production, leading to incomplete plating and potential corrosion, which affects the quality and performance of the projectile.
Innovation Solution
A method involving the mixing of materials with different densities, such as tungsten and tin, is used to create a core mixture that is heated, quenched, and plated with a jacket material like copper, with a binding agent like ACUMIST A12, and then re-struck to achieve a centered and stable projectile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional core seating and jacket formation methods are used, then the projectile structure is formed, but significant core material loss occurs and plating quality deteriorates
Solution Approach 1:
The core is pre-formed with a rounded leading end before jacket formation, rather than attempting to form it during seating. This preliminary shaping action prevents material loss and provides a stable base for subsequent plating operations
Solution Approach 2:
The invention changes the geometric parameters of the core, specifically rounding the leading end radius to between 0.004 and 0.016 inches, which optimizes both material retention and plating quality while eliminating the need for excessive core protrusion
2Strength
If the core is seated deeply in the jacket to close the open end, then structural integrity improves, but core material loss increases and plating defects occur
Solution Approach 1:
The core leading end is pre-rounded before seating, which allows the core to be seated shallower in the jacket while still achieving proper structural integrity. This preliminary geometric modification eliminates the need to over-seat the core to compensate for material loss
Solution Approach 2:
The core is given a different geometric quality at its leading end (rounded) compared to its trailing end (flat), concentrating the structural integrity function at the rounded interface with the jacket while allowing the trailing end to maintain proper seating depth
3Shape
If the core leading end is sharply formed, then aerodynamic shape is achieved, but material loss increases during production
Solution Approach 1:
The invention optimizes the leading end radius parameter to a specific range (0.004-0.016 inches) that balances aerodynamic performance with manufacturing stability, eliminating material loss while maintaining functional aerodynamic shape
Solution Approach 2:
The core has differentiated geometric qualities: a rounded leading end for aerodynamic function and material retention, and a flat trailing end for stable seating, allowing each end to be optimized for its specific function without compromise
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
This approach minimizes core material loss and enhances the bonding of powder grains, resulting in a more reliable and higher-quality projectile with improved plating and reduced corrosion risks.
Implementation Method 1
heating the core mixture to the melting point
Implementation Method 2
quenching the core mixture
Data Source
AI summary
A method of forming a projectile for use in a firearm ammunition cartridge, the method including mixing a first material and a second material having different densities to produce a core mixture, disposing the core mixture in a die, heating the core mixture to the melting point, removing the core mixture from the die, quenching the core mixture, and plating the core mixture with a jacket material.