Precision Bullet Core Profiling to Prevent Jacket Slippage
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Solution Overview
Problem
Existing bullets experience slip between the core and jacket due to a lack of form-locking, leading to uncontrolled torsion and fragmentation, which deteriorates flight characteristics and accuracy.
Innovation Solution
A precision bullet design featuring a bullet core with a bow-side and tail-side section offset from the guide band, with a profiling that forms a form-locking anti-rotation structure between the core and jacket, including surface roughness and interference fits to enhance spin force transmission and prevent slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protrusion-recess structure is formed in the guide band to reduce slip between core and jacket, then anti-rotation performance is improved, but the guide band is weakened causing insufficient spin force transmission
Solution Approach 1:
The anti-rotation structure is extracted from the guide band and relocated to the bullet core. The profiling is formed directly on the bullet core surface, separating the anti-rotation function from the guide band structure, thereby maintaining guide band integrity while achieving form-locking between core and jacket.
Solution Approach 2:
Instead of forming the anti-rotation structure on the jacket (conventional approach), the patent inverts the approach by forming the profiling on the bullet core. This reversal allows the core to actively engage with the jacket through complementary profiling, achieving anti-rotation without compromising jacket strength.
2Manufacturing precision
If slip between core and jacket is prevented through form-locking, then bullet precision is improved, but uncontrolled torsion and fragmentation occur without proper spin force transmission
Solution Approach 1:
The profiling is applied locally to specific regions of the bullet core (bow-side and/or tail-side sections) rather than uniformly across the entire core. This localized approach creates form-locking zones that prevent slip while maintaining overall core-jacket stability and enabling controlled spin force transmission.
Solution Approach 2:
The bullet employs a composite structure with the core and jacket made of different materials, enhanced by the profiling interface. The profiling creates a composite mechanical bond that combines the form-locking benefits with the material properties of both core and jacket, preventing both slip and fragmentation.
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 design significantly improves spin force transmission and precision, achieving Sa-values of less than 30 mm, with enhanced stability and accuracy by preventing unwanted rotation and maintaining structural integrity of the guide band.
Implementation Method 1
the bullet jacket adapts complementary in shape in such a way that an anti-rotation structure is formed between the bullet jacket and the bullet core
Implementation Method 2
surface roughness and interference fits to enhance spin force transmission and prevent slippage
Implementation Method 3
including surface roughness and interference fits to enhance spin force transmission and prevent slippage
Data Source
AI summary
The present invention relates to a bullet, in particular precision bullet, comprising a bullet core with a bow-side section, a tail-side section with a bullet base and a guide band located therebetween, and a bullet jacket completely surrounding the bullet core, wherein in the region of the bullet core tail axially offset from the guide band and/or in the region of a tail-side end face of the bullet core base and/or in the region of the bullet core bow axially offset from the guide band a profiling is placed, in accordance with the bullet jacket, adapts complementary in shape in in such a way that an anti-rotation structure is formed between the bullet jacket and the bullet core.