Segmented Copper Bullet with Polymer Tip for Controlled Expansion
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Solution Overview
Problem
Existing hunting bullets face challenges in achieving high muzzle velocities, improved expandability, and homogenous penetration of game tissue regardless of impact velocity, while also being cost-effectively manufactured.
Innovation Solution
A bullet design featuring a solid lead-free metal body, preferably made of copper, with a polymer bullet tip manufactured via injection molding, incorporating inner grooves and a specific geometry that enhances expansion and penetration, including a tapered cross-section, inclined grooves, and a central bridge for efficient deformation and low air resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a traditional solid metal bullet design is used, then manufacturing is simple and cost-effective, but muzzle velocity and expandability are limited
Solution Approach 1:
The bullet is divided into two distinct segments: a solid lead-free metal body (copper or other non-lead material) and a separate polymer tip. This segmentation allows each part to be optimized independently - the metal body provides structural integrity and velocity while the polymer tip enables controlled expansion upon impact, resolving the contradiction between achieving high muzzle velocity and maintaining structural simplicity.
Solution Approach 2:
The bullet combines different materials with complementary properties: lead-free metal (copper) for the body providing durability and velocity, and polymer material for the tip providing expandability. This composite structure allows the bullet to achieve both high muzzle velocity and improved expandability without compromising manufacturing feasibility.
2Reliability
If a polymer tip is added to enhance expandability, then tissue penetration becomes more homogenous, but manufacturing complexity increases
Solution Approach 1:
By separating the bullet into a metal body and polymer tip components, each can be manufactured using optimized processes for its specific material - metal forging or casting for the body, and injection molding for the polymer tip. This segmentation actually simplifies manufacturing compared to creating a complex monolithic structure, while ensuring consistent tissue penetration through the polymer's controlled expansion.
Solution Approach 2:
The polymer tip's material properties (viscoelasticity, hardness) are specifically selected and controlled to ensure homogenous tissue penetration across various impact velocities. The polymer's ability to deform in a controlled manner upon impact creates consistent cavity formation regardless of whether the bullet travels at high or low velocity, improving reliability.
3Duration of action of moving object
If inner grooves and specific geometry are added to enhance expansion, then expandability improves, but manufacturing precision requirements increase
Solution Approach 1:
The inner grooves are strategically positioned and dimensioned to create localized stress concentration points within the polymer tip. These grooves are not uniformly distributed but positioned specifically to initiate and control expansion at critical locations during impact, extending the expansion duration while maintaining manageable manufacturing precision requirements through optimized groove placement.
Solution Approach 2:
The grooves and geometric features are pre-formed during manufacturing to create predetermined stress distribution patterns. This preliminary structuring ensures that when impact occurs, the bullet expands in a controlled sequence and direction, extending the expansion duration while the grooves themselves serve as built-in guides that reduce the need for extremely tight manufacturing tolerances during final assembly.
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 bullet achieves improved muzzle velocities, enhanced expandability, and consistent tissue penetration across various velocities, along with cost-effective manufacturing through optimized tooling and cutting speeds, ensuring faster and more effective hunting outcomes.
Implementation Method 1
the bullet tip is made of polymer material... configured to expand upon impact
Implementation Method 2
a solid body bullet body and made of lead-free metal... improved muzzle velocities
Data Source
AI summary
The invention relates to a bullet, which comprises a bullet body and a bullet tip, which bullet body of the bullet is a solid body bullet body and made of lead-free metal, advantageously of copper, most advantageously extremely pure copper, which bullet tip of the bullet is made of polymer material, advantageously of POM (polyoxymethylene). The bullet body of the bullet comprises an inner central opening with inner grooves located radially spaced apart at the circumference of the inner central opening. The bullet tip of the bullet comprises a tip end part, tip end grooves and a tip end central bridge, and the bullet tip is located in the inner central opening of the bullet body such, that the tip end part of the bullet tip is outside the bullet body.