Projectile Groove Geometry for Smooth Surface Transitions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for introducing functional grooves into projectiles, such as full metal jacket or partial metal jacket projectiles, are complex and hinder mass production, leading to reduced cycle rates and potential performance impairment due to contour jumps and material displacement.
Innovation Solution
A projectile design with circumferential and/or longitudinal grooves that transition smoothly into the projectile surface without contour jumps, combined with a tool and device for grooving that utilize an elastic deformation mechanism, allowing high-speed production and minimal performance impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cross-rolling is used to introduce circumferential grooves, then the groove can be formed, but contour jumps and material displacement occur which negatively affect projectile performance
Solution Approach 1:
The invention changes the groove formation mechanism from cross-rolling to grooving with controlled parameters. The groove is formed by pressing a grooving tool into the projectile body with controlled depth and geometry, ensuring smooth transitions without contour jumps. The groove bottom diameter is controlled to be between 0.4-0.6 times the projectile caliber, and the groove depth is limited to maintain surface continuity.
Solution Approach 2:
The invention replaces the cross-rolling mechanical system with a direct grooving system. Instead of rolling the projectile through dies that create contour jumps, a grooving tool directly presses into the projectile body to form the groove, eliminating the harmful material displacement and contour discontinuities associated with cross-rolling.
2Ease of manufacture
If complex tool setups with various tool arrangements are used, then functional grooves can be produced, but the cycle rate cannot be increased and profitability is negatively affected
Solution Approach 1:
The invention merges multiple tool functions into a single grooving tool. Instead of using complex tool stations with various tool arrangements for different groove operations, one grooving tool performs all necessary groove formation operations, simplifying the tool setup and enabling faster cycle rates for mass production.
Solution Approach 2:
The invention extracts the essential groove formation function from the complex tool station system. By isolating the grooving operation and performing it with a dedicated grooving tool rather than through multiple tool arrangements, the process is simplified and the cycle rate can be increased for more profitable mass production.
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 enables higher production cycle rates and cost-effective manufacturing while maintaining projectile performance by minimizing material displacement and contour jumps, enhancing holding and deformation capabilities.
Implementation Method 1
The groove transitions into the adjacent inner and/or outer surfaces of the projectile body without a contour jump and/or has a radius of at least 0.05 mm, especially at most 0.1 mm
Data Source
AI summary
The present invention relates to a projectile, in particular a full metal jacket projectile or partial metal jacket projectile, for ammunition, for example with a caliber of at most 20 mm, in particular of at most 13 mm, comprising an at least partially hollow or solid projectile body with a circumferential and/or longitudinal groove arranged on its inner and/or outer surface, which transitions seamlessly into the adjacent inner and/or outer surfaces of the projectile body and/or has a radius of at least 0.05 mm.