Cover Ring Radial Deformation for Projectile Sealing
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Solution Overview
Problem
Existing methods for sealing light trails or similar components in projectiles are inefficient, often requiring complex and costly heat treatment of the projectile body material, which can lead to material deformation issues and increased weight due to screw connections, while also being prone to errors and higher assembly efforts.
Innovation Solution
A method where a cover ring is radially pressed into a circumferential groove contour of the projectile body using a rigid punch, allowing the cover to be deformed and securely fixed without altering the projectile body material, ensuring a stable and airtight seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the projectile body material is reshaped through heat treatment to enable forming processes, then the material becomes soft and ductile for deformation, but the process becomes complex, costly, and time-consuming with risk of cracks
Solution Approach 1:
Instead of deforming the projectile body material through complex heat treatment, the patent inverts the approach by deforming the cover material. The cover is radially pressed into the groove contour, transferring the deformation requirement from the projectile body to the cover, which is simpler and more reliable
Solution Approach 2:
The patent extracts the deformation requirement from the projectile body material and applies it separately to the cover material. This separates the forming process from the main projectile body, avoiding the need for complex heat treatment of the projectile itself
2Reliability
If screw connections are used to secure the cover, then the sealing is reliable, but the weight increases and assembly effort increases due to additional securing measures
Solution Approach 1:
The cover ring secures itself to the projectile body through radial deformation into the groove contour. The acceleration, mass, and centrifugal forces during firing press the deformed cover against the projectile body, creating a self-securing connection without additional screws or nuts
Solution Approach 2:
The radial deformation of the cover into the groove contour creates a curved, interference-fit connection that leverages centrifugal forces during firing to press the cover tightly against the projectile body, eliminating the need for threaded fasteners
3Strength
If the projectile body material is hardened to maintain structural integrity, then the ballistic effectiveness improves, but the material becomes difficult to deform for forming processes
Solution Approach 1:
The patent segments the forming requirement from the projectile body and applies it to the cover instead. This allows the projectile body to remain hard and ballistic-effective while the cover undergoes the necessary deformation separately through radial pressing
Solution Approach 2:
The deformation is localized to the cover material and the groove interface, not the entire projectile body. This allows the projectile body to maintain its hard, ballistic-effective properties while the cover is locally deformed to achieve the seal
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 simplifies the manufacturing process, reduces costs and time, enhances process stability, and prevents parts from flying off during firing, while allowing flexibility in material choice and easy error detection through visual inspection.
Implementation Method 1
part of the cover is pressed radially into a circumferential groove contour in the projectile body by a preferably rigid punch which only needs to move axially and is provided with a special outer contour. The outer contour should be matched to the groove contour (or vice versa) so that the material of the cover, which is radially deformed by the punch in the forward movement, can be pressed into the groove contour
Implementation Method 2
Since the cover is deformed from the inside to the outside, it is pressed against the projectile body by the acceleration, mass and centrifugal forces that occur when the projectile is fired, so that no parts fly off
Data Source
Figure 1~4
Figure 2
AI summary
It is proposed that instead of the projectile body material, a cover (6) itself is reshaped. For this purpose, a portion of the cover (6) is pressed radially into a circumferential groove contour (8) in the projectile body by a preferably rigid punch (5), which only needs to move axially and is provided with a special outer contour (7). The outer contour (7) should be matched to the groove contour (8) (or vice versa) so that the material of the cover (6), radially reshaped by the forward-moving punch (5), can be pressed into the groove contour (8) of the projectile body, and the cover (6) after reshaping has no degrees of freedom, thus fixing it to the tracer (2, 3) or the like. The cover (6) is preferably a cover ring.