Elastic Plastic Casing Cover for Tank Ammunition Assembly
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Solution Overview
Problem
The assembly of large-caliber tank ammunition shells with combustible propellant charge casings is time-consuming and expensive due to the need for separate production lines for mounting the casing cover and sealing ring, and the materials used are prone to fracture and unintended ignition.
Innovation Solution
Producing the casing cover as an injection molded elastic plastic, where the front end region forms the sealing ring, allowing for integrated assembly and reducing the risk of fracture and ignition, with an optional annular rated break point for separation during discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate production lines are used for mounting the casing cover and sealing ring, then the assembly can be completed with traditional materials, but the assembly process becomes time-consuming and expensive
Solution Approach 1:
The patent combines the casing cover and sealing ring into a single integrated component made of elastic plastic. The casing cover is designed with an integrated sealing ring that forms a continuous sealing surface directly on the projectile, eliminating the need for separate mounting operations and reducing assembly complexity to a single attachment step.
Solution Approach 2:
The elastic plastic casing cover serves multiple functions simultaneously: it acts as both the structural cover and the sealing element. The material's elasticity allows it to deform and seal around the projectile while maintaining structural integrity, replacing what were previously two separate components with one multi-functional part.
2Reliability
If brittle materials like nitrated or nonnitrated resin-impregnated cardboard are used for the casing cover, then the traditional assembly method works, but the assembly becomes susceptible to fracture and cracking
Solution Approach 1:
The patent changes the material parameter from brittle resin-impregnated cardboard to elastic plastic. This material substitution fundamentally alters the mechanical properties, providing flexibility and resistance to fracture while maintaining the structural and sealing functions of the casing cover.
3Object-affected harmful factors
If combustible materials like nitrated resin-impregnated cardboard are used for the casing cover, then the traditional design is simpler, but unintended ignition can occur during loading and unloading
Solution Approach 1:
The patent employs a disposable elastic plastic casing cover that is discarded after a single use. This eliminates the need for expensive protective coatings while ensuring safety, as the single-use nature prevents any risk of unintended ignition during handling, and the elastic plastic material itself is non-combustible.
4Object-affected harmful factors
If protective coatings are applied to traditional casing covers, then ignition risk is reduced, but the manufacturing process becomes more complex and costly
Solution Approach 1:
The patent eliminates the need for protective coatings by using a disposable elastic plastic casing cover. The material's inherent non-combustible properties provide ignition protection without requiring additional coating processes, simplifying manufacturing while maintaining safety.
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 method simplifies and cost-reduces the assembly process, enhances the shell's durability by absorbing deformational energy, and eliminates the need for protective coatings, while ensuring safe separation of the casing cover during firing.
Implementation Method 1
the replacement of the relatively brittle and abrasion-sensitive material used for the casing cover in previously known shells by an elastic plastic means that the total assembly consisting of the casing cover, projectile, and propellant charge casing is less susceptible to fracture and cracking than similar, previously known assemblies, since the elastic plastic absorbs deformational energy
Implementation Method 2
the front end region of the casing cover facing the projectile forms the sealing ring of the projectile
Data Source
AI summary
A method for producing a shell and a shell produced by this method, wherein the shell has a projectile, a combustible propellant charge casing, and a casing cover that joins the propellant charge casing with the projectile, such that the projectile has a sealing ring adjacent to the casing cover. To realize cost-effective assembly of a shell of this type, the casing cover is produced as an injection molded part made of an elastic plastic, such that the front end region of the casing cover facing the projectile forms the sealing ring.