Cartridge Practice Round Simplified Mechanical Connection
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Solution Overview
Problem
The manufacturing of medium-caliber practice cartridges is costly due to complex designs with rotating parts and machined components, and existing cartridges have high production costs and complex assembly processes.
Innovation Solution
A simplified design featuring a one-piece cylindrical central body with a spring collar projectile tip and a one-piece cartridge shell with a spring-elastic collar, using fewer parts and materials like plastic or composite materials, with a mechanical connection that ensures reproducible firing characteristics by shearing at a specific pressure, preventing gas leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional designs with rotating parts, machine-drilled bores, and threaded connections are used, then the cartridge achieves reliable mechanical connection and firing characteristics, but the manufacturing cost and device complexity increase significantly
Solution Approach 1:
The patent merges multiple traditional components into a simplified integrated design. The cartridge case and projectile are connected through direct engagement of formation elements without requiring separate threaded connections, rotating parts, or machine-drilled bores. This consolidation maintains reliable mechanical connection while dramatically reducing device complexity and manufacturing cost.
Solution Approach 2:
The invention employs a disposable cartridge design where the case and projectile form a temporary mechanical connection sufficient for single-use firing. The engagement elements provide adequate reliability for the intended application without requiring durable, complex fastening mechanisms, thereby reducing overall system complexity.
2Strength
If traditional threaded connections and machined components are used, then the cartridge achieves secure mechanical connection, but the manufacturing cost and production complexity increase
Solution Approach 1:
The patent replaces traditional mechanical fastening systems (threads, machine-drilled bores, crimping operations) with a simplified formation element engagement system. The mechanical connection is achieved through geometric interlocking of formed features rather than complex fastening mechanisms, significantly easing manufacturing while maintaining connection strength.
Solution Approach 2:
The invention changes the manufacturing parameters from precision machining and threading operations to forming processes. The engagement elements are created through forming operations on the cartridge case and projectile, which are simpler and more cost-effective than traditional machining methods, thereby reducing production cost while maintaining mechanical connection integrity.
3Ease of manufacture
If fewer parts and simplified materials are used, then the manufacturing cost and production process are simplified, but the firing characteristics and ballistic performance may deteriorate
Solution Approach 1:
The patent applies local quality by providing engagement elements at specific locations on the cartridge case and projectile where mechanical connection is most critical. The formation elements are strategically positioned to ensure proper alignment and secure connection during firing, maintaining ballistic performance while using fewer parts overall. The simplified design concentrates structural features where needed rather than uniformly throughout the cartridge.
Data Source
AI summary
The cartridge-type training round consists of a projectile and a cartridge shell into which the projectile is inserted. The projectile includes a one-piece cylindrical central body (2) and a one-piece basin-shaped projectile tip (5) that is pressed onto the central body and engages a circumferential engagement bead (7) with a circumferential engagement slot (8) located in the central body (2). The cartridge shell (20) is a one-piece basin-shaped part; it is also pressed onto the central body (2) and engages a circumferential engagement bead (22) with a circumferential engagement slot (23) of the central body (2). A receiver recess (25) is provided in an approximately cylindrical projection (24) that is inserted centered from the base to receive the propulsive charge (28) and its igniter (29). The round is of simple design, and may be manufactured inexpensively owing to its simple parts that may be largely of plastic without loss of function.