Projectile Fin Assembly Threaded Separation Mechanism
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Solution Overview
Problem
The fin assembly of explosive and penetrating projectiles often disrupts the operation of the fuze upon impact, as it remains intact and interferes with the explosive charge's firing mechanism, compromising the projectile's ability to penetrate and explode effectively behind armored protection.
Innovation Solution
A trajectory-stabilizing fin assembly is secured to the projectile body via a threaded mechanical connection that includes a tapped tube and a threaded rear cylindrical shank, with fragilization means such as longitudinal grooves on the tube, allowing the fin assembly to break away upon impact, ensuring the fuze remains operational.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the fin assembly is secured to the projectile body by a threaded mechanical connection, then the fin assembly provides trajectory stabilization, but the fin assembly may disrupt the operation of the fuze on impact
Solution Approach 1:
The fin assembly is designed as a separate component that can detach from the projectile body. The threaded connection allows the fin assembly to be secured during flight for stabilization, but enables separation upon impact to prevent interference with the fuze. This segmentation resolves the contradiction by allowing the fin assembly to fulfill its stabilization function while eliminating the risk of disrupting fuze operation through controlled detachment.
Solution Approach 2:
The threaded mechanical connection between the fin assembly and projectile body is designed to be dynamic rather than static. The connection maintains integrity during the flight phase providing stabilization, but allows for separation upon impact. This dynamic characteristic enables the system to adapt its configuration based on operational requirements, resolving the contradiction between maintaining stabilization and preventing fuze interference.
2Strength
If the fin assembly remains intact upon impact, then the fin assembly maintains structural integrity, but the fin assembly interferes with the explosive charge's firing mechanism
Solution Approach 1:
The fin assembly is extracted or removed from the projectile body upon impact through the designed threaded connection. This extraction eliminates the harmful interference of the fin assembly with the fuze while maintaining the structural integrity of the fin assembly during flight. The separation mechanism allows the fin assembly to be taken out at the appropriate moment to prevent fuze disruption.
Solution Approach 2:
The fin assembly is designed to be discarded or separated from the projectile body after fulfilling its stabilization function during flight. The threaded connection enables this discarding action upon impact, removing the harmful element (fin assembly) while the main projectile body continues with the explosive charge operation. The fin assembly is recovered only in the sense that it maintains its structural integrity during the flight phase before being discarded.
3Strength
If a threaded mechanical connection is used to secure the fin assembly, then the fin assembly can be firmly attached, but the connection may not separate reliably upon impact
Solution Approach 1:
The threaded connection is designed with parameters that change under different loading conditions. During flight, the connection maintains high strength to secure the fin assembly firmly. Upon impact, the inertial forces and stress changes cause the threaded connection to fail in a controlled manner, enabling reliable separation. The parameter changes in the connection's mechanical properties under different operational phases resolve the contradiction between strong attachment and reliable separation.
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 fin assembly separates from the projectile body upon impact, preventing interference with the fuze and allowing the projectile to maintain its penetrating and explosive capabilities without disrupting the fuze's operation.
Implementation Method 1
the inertial advance motion of the fin assembly on the conical portion, upon impact of the projectile on a target, causing the grooves to break
Implementation Method 2
breakage initiators arranged on the tube of the tail, between the fins of the consisting of, wherein said breakage initiators are made as longitudinal grooves that ensure a thinning of the thickness of the tube, the inertial advance motion of the fin assembly on the conical portion, upon impact of the projectile on a target, causing the grooves to break
Data Source
AI summary
The invention relates to a penetrating and explosive projectile (1) provided with a trajectory-stabilizing fin assembly (8) which is secured to a body of the projectile by a mechanical connection. The fin assembly (8) includes a tapped tube (14) which engages on a threaded rear cylindrical shank (10) of a tail (9) connected to the projectile body (2), thereby forming a threaded mechanical connection (13) between the tail unit (8) and the body (2). This projectile (1) is characterized in that it includes means ensuring the fragilization of the threaded connection (13) on impact on a target, the fin assembly then separating from the projectile body.