Machine Gun Barrel Durability via Tenifer QPQ Coating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing infantry machine guns have a limited barrel durability, allowing for fewer than 15,000 shots before performance degradation, necessitating the development of a more durable machine gun that can fire a higher number of shots.
Innovation Solution
The machine gun features a barrel made of steel doped with chromium, molybdenum, and vanadium or chromium, nickel, and molybdenum, with a specialized coating process using the Tenifer QPQ technique, increasing barrel durability and extending the number of shots to 30,000.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the barrel is made of steel grade 30XPFMΦA under CT B5150-89, then the manufacturing process is simple and cost-effective, but the barrel durability is limited to less than 15000 shots
Solution Approach 1:
The patent applies composite materials by combining steel grade 30XPFMΦA with a Tenifer QPQ coating layer. The coating comprises multiple layers including a phosphate layer, a chromate layer, and a top coat, creating a composite structure that significantly enhances barrel durability to 30000 shots while maintaining manufacturing feasibility through established coating processes
Solution Approach 2:
The patent changes the surface parameters of the barrel by applying the Tenifer QPQ coating process, which transforms the surface chemistry and physical properties of the steel. This parameter change at the surface level increases wear resistance and durability without altering the bulk material properties or requiring changes to the base manufacturing process
2Duration of action of stationary object
If the barrel is made of steel doped with chromium, molybdenum, and vanadium with Tenifer QPQ coating, then the barrel durability increases to 30000 shots, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by performing surface preparation steps (cleaning, roughening) and applying intermediate layers (phosphate, chromate) before the final top coat. This sequential preliminary preparation ensures optimal adhesion and performance of the durable coating, achieving 30000-shot durability while keeping the overall process manageable through standardized procedures
3Duration of action of stationary object
If the barrel is made of steel doped with chromium, nickel, and molybdenum, then the barrel durability increases to 30000 shots, but the material cost and manufacturing complexity increase
Solution Approach 1:
The patent applies local quality by doping the steel with specific alloying elements (chromium, nickel, molybdenum) localized in the barrel material, and applying the Tenifer QPQ coating specifically on the interior surface where durability is most critical. This targeted approach enhances durability to 30000 shots while minimizing overall manufacturing complexity and cost compared to treating the entire weapon system
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 results in a machine gun capable of firing 30,000 shots, doubling barrel durability and performance compared to prior art, with a rate of fire of 650 shots per minute and effective range of 1600 to 2000 meters, maintaining damage effect up to 3800 meters.
Implementation Method 1
the above steel preforms used for producing a barrel are processed under the so-called technique Tenifer QPQ
Data Source
AI summary
A machine gun has a barrel, a receiver assembly comprising a cover, a receiver base and a butt; lock frame comprising an extractor and a gas piston; bolt, return mainspring with guiding bar, gas piston tube, flash absorber, trigger mechanism, gunsight, butt sighting appliances, trigger pull and loading case. A barrel is made of a preform produced of steel. The barrel is coated inside and steel comprises the additional chemical elements.