Firearm Barrel Fluting with Varying Groove Depth and Width
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Solution Overview
Problem
Existing firearm barrel fluting methods either result in uniform flute depth and width, which limits weight reduction and cooling efficiency, or require complex machining for spiral fluting, and can affect stress performance with longitudinal fluting.
Innovation Solution
The exterior surface of a firearm barrel features circumferentially spaced grooves with varying depth and/or width along its length, which can be either longitudinal or helical, using various cutting tools and techniques to create a pattern of alternating widths and depths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If flutes are formed with constant depth and width along the barrel length, then the machining process is simple, but the weight reduction and cooling efficiency are limited
Solution Approach 1:
The patent applies local quality by varying the depth and/or width of flutes at different locations along the barrel length. The flute dimensions are not uniform but are specifically optimized at different zones (e.g., larger dimensions near the chamber for weight reduction, smaller dimensions toward the muzzle). This allows maximum weight reduction and cooling efficiency at critical hot zones while maintaining structural integrity and simplicity in other areas.
2Weight of moving object
If spiral fluting is used to reduce weight and increase cooling surface area, then the barrel becomes lighter and cools better, but the machining equipment and process become complex
Solution Approach 1:
The patent segments the fluting process into multiple passes with different flute dimensions at different locations. Instead of using complex spiral fluting equipment, the invention uses a simpler end mill that can be positioned at different axial locations to create flutes of varying depths and widths. This segmentation allows weight reduction and cooling surface area increase without requiring complex spiral machining equipment.
3Weight of moving object
If longitudinal fluting is used to reduce weight, then the barrel loses weight, but the straight line edges affect stress performance
Solution Approach 1:
The patent introduces asymmetry by varying the flute dimensions asymmetrically along the barrel length. The flutes have different depths and widths at different axial positions, creating an asymmetric pattern that disrupts the formation of continuous straight-line edges. This asymmetric variation in flute geometry helps distribute stress more evenly through the barrel wall, reducing the negative impact on stress performance while still achieving weight reduction.
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 allows for a stiffer and lighter barrel with enhanced heat dissipation while avoiding the complexity of spiral fluting and maintaining stress performance, enabling a customizable pattern for improved accuracy and reduced weight.
Implementation Method 1
These flutes reduce the weight of the barrel while increasing the exterior surface area of the barrel, which can provide more effective cooling of the barrel
Data Source
AI summary
The present invention provides a fluted firearm barrel and method of making a fluted firearm barrel. An elongated barrel has an exterior surface. A plurality of longitudinally extending, circumferentially spaced apart grooves are formed in the exterior surface. Each groove varies in width multiple times along the length thereof, such that each groove has at least two widened portions with a narrowed portion therebetween.