Lead-Free Projectile Radial Guide Friction Reduction
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Solution Overview
Problem
Conventional ammunition contains toxic heavy metals, leading to environmental contamination and health risks, with existing lead-free alternatives suffering from low penetrability and generating hazardous metal particles during firing.
Innovation Solution
A lead-free projectile with a hard-metal core partially enclosed by a steel jacket, featuring a detachable two-part core design with radial guidance for reduced friction and a modular jacket structure to minimize wear and toxic emissions, using unhardened steel and copper plating to enhance performance and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lead-free composite projectiles are used, then environmental toxicity is reduced, but penetrability decreases
Solution Approach 1:
The projectile core is divided into two segments: a hard front core part for penetration and a softer rear core part for stability. This segmentation allows the projectile to combine the penetrability of hard materials with the environmental benefits of lead-free composition, resolving the contradiction between strength and toxicity reduction.
Solution Approach 2:
The projectile uses a composite structure combining different materials (steel core, tombac jacket, polymer coating) with complementary properties. The hard front core provides penetrability while the lead-free composite construction reduces environmental toxicity, allowing both requirements to be satisfied simultaneously.
2Strength
If steel core projectiles are used, then penetrability is improved, but friction with barrel increases causing harmful metal particles
Solution Approach 1:
The steel core is nested within a tombac jacket which is in turn coated with polymer. This nested structure protects the steel core from direct contact with the barrel, reducing friction-generated metal particles while maintaining the penetrability benefits of the steel core.
Solution Approach 2:
The tombac jacket and polymer coating act as intermediary layers between the steel core and the barrel. These intermediaries reduce direct metal-to-metal friction, thereby reducing harmful metal particle emissions while allowing the steel core to maintain its penetrability function.
3Reliability
If conventional priming compositions are used, then reliable ignition is achieved, but toxic combustion gases are generated
Solution Approach 1:
The priming composition parameters are changed by replacing lead styphnate with zinc peroxide and adjusting the oxidizer-to-fuel ratio. This parameter change reduces toxic gas emissions while maintaining ignition reliability through the use of alternative chemical compounds with similar energetic properties.
Solution Approach 2:
The invention discards toxic substances (lead styphnate, barium nitrate) from the priming composition and replaces them with environmentally friendly alternatives (zinc peroxide, potassium nitrate). This discarding of harmful materials is achieved while recovering the essential ignition function through substitute chemicals.
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 solution significantly reduces environmentally hazardous metal particles and gases, improves projectile performance, and allows for adaptable configurations to meet various performance and environmental demands, enhancing safety and reducing cleanup costs.
Implementation Method 1
The projectile lacks a conventional jacket, and has therefore been replaced with a surface coating constituted by a soft metal, copper, nickel, zinc, aluminum or mixtures thereof, plated directly onto the steel core
Implementation Method 2
the front and the rear core part are detachably joined together with each other by a radial guide configured for mutual freedom of rotation between the front and rear core part
Implementation Method 3
the rear core part comprises a cylindrical core part having the length L C and a conical core part having the length L k
Data Source
AI summary
The invention relates to a lead-free projectile (5) having improved performance and intended for small-bore weapons, configured so that the quantity of toxic metal particles and gases which is formed by the friction between the projectile (5) and the inner side of the weapon upon firing of the projectile (5) is reduced, at the same time as the performance of the projectile (5) is improved or maintained. The projectile (5) is characterized in that the core (6) of the projectile (5) comprises a front core part (7), constituting the penetrator part of the projectile (5), and a rear core part (8), constituting the ballast part of the projectile (5), wherein the front and the rear core part (7, 8) are detachably joined together with each other by a radial guide (9) configured for mutual freedom of rotation between the front and rear core part (7, 8), and in that the rear core part (8) comprises, on the one hand, a cylindrical part and, on the other hand, a conical part having a cone angle a within the range 5° - 9°, wherein the contact surface between the cylindrical part and the inner side of the weapon 1 upon firing of the projectile (5) constitutes less than 30% of the total surface area of the projectile (5). The invention also relates to an improved cartridge (1) and an improved method.