Composite Projectile Body with Embedded Fragments via Powder Metallurgy
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Solution Overview
Problem
Existing methods for embedding preformed fragments into composite projectile bodies are inefficient, often requiring multi-step processes that are time-consuming and prone to introducing cracks and fragmentation, making them unsuitable for mass production.
Innovation Solution
A method utilizing a cage body to support preformed fragments, surrounded by metal casing powder, which is then subjected to elevated heat and pressure to form a monolithic unit, ensuring precise placement and encapsulation of fragments within the projectile body using additive manufacturing and powder metallurgy techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multi-step powder compression processes are used to embed preformed fragments, then fragment placement is achieved, but production time increases and manufacturing complexity increases
Solution Approach 1:
The cage body is pre-assembled with preformed fragments positioned in their final predetermined locations before the powder metallurgy process begins. This preliminary arrangement eliminates the need for multiple compression stages and fixture repositioning, allowing direct formation of the final projectile body in a single processing step.
Solution Approach 2:
The supporting structure is designed as a segmented cage body with distinct cells or compartments that hold individual fragments. This segmentation allows fragments to be independently positioned and secured within the cage, maintaining precise placement during the metallurgical processing while enabling straightforward assembly and production.
2Manufacturing precision
If removable fixtures are used to hold fragments during compression, then fragment positioning is achieved, but the process becomes time-consuming and不适合 mass production
Solution Approach 1:
The cage body serves as an intermediary supporting structure that permanently holds fragments in their predetermined positions. Unlike removable fixtures, the cage body remains in place throughout the entire metallurgical processing, eliminating time-consuming removal and repositioning operations while maintaining precise fragment positioning.
Solution Approach 2:
The supporting structure and the final projectile body are merged into a single integrated component. The cage body becomes part of the monolithic projectile structure after metallurgical consolidation, eliminating the need for separate fixtures and reducing the number of manufacturing steps.
3Manufacturing precision
If multiple powder compression stages are employed, then complete encapsulation of fragments is achieved, but the risk of introducing cracks and fragmentation increases
Solution Approach 1:
The process uses controlled changes in temperature and pressure parameters during a single metallurgical consolidation step. By gradually increasing temperature and pressure within controlled ranges, the powder is densified and fragments are completely encapsulated without generating excessive mechanical stresses that would cause cracks or fragmentation.
4Manufacturing precision
If preformed fragments are embedded using traditional methods, then fragment placement is achieved, but the final product lacks cohesive structural integrity
Solution Approach 1:
The final projectile body is formed as a composite monolithic structure where metal powder and the cage body with embedded fragments are metallurgically consolidated into a unified material system. This composite structure maintains precise fragment placement while achieving superior structural integrity through the metallurgical bonding of all components.
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 allows for the precise and cohesive embedding of preformed fragments, reducing the risk of cracks and fragmentation, and enabling the production of a unified projectile body with enhanced structural integrity and ballistic performance.
Implementation Method 1
subjecting the canister assembly to elevated heat and pressure wherein the metal casing powder and the supporting cage body are metallurgically processed into a monolithic unit
Data Source
AI summary
A method for preparing a composite projectile body with preformed fragments precisely embedded within the walls of the projectile body. The process utilizes a combination of additive manufacturing and advanced powder metallurgy fabrication techniques. Specifically a skeletal structure or prefabricated cage body is filled with preformed fragments. The cage structure may be situated on a mandrel or tool inside a container. The container is filled with metal powder, degassed under vacuum, and sealed. The canister is then subjected to heat and pressure to consolidate the powder to full density. The canister is then removed and the compacted billet product is further machined to obtain a desired projectile body.