Projectile Casing Reshaping With Die-Mandrel Precision
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Solution Overview
Problem
Existing projectile casings often have irregular shapes or defects that affect the accuracy and consistency of projectile firing due to uneven pressure distribution and spin, which can be exacerbated by environmental factors.
Innovation Solution
A system and method using a die and mandrel to reshape and resize projectile casings by inserting a mandrel into a die, securing the casing, and extracting the mandrel to uniformly modify the casing's neck and shoulder sections, ensuring consistent dimensions and shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a projectile casing is used without modification, then the manufacturing process is simple and fast, but the shape consistency and dimensional precision are poor due to irregularities and defects
Solution Approach 1:
The die and mandrel system performs preliminary shaping actions on the casing during the reloading process itself. The mandrel is inserted into the die cavity before the casing is placed, and as the press applies force, the casing is forcibly reshaped to conform to the precise dimensions of the die and mandrel, correcting irregularities before the projectile is seated
Solution Approach 2:
The mandrel serves as an intermediary tool that transfers the precise geometric form of the die cavity to the casing. By inserting the mandrel into the die and then forcing the casing onto it, the system uses the mandrel as a mediator to ensure uniform dimensional transfer, particularly for the neck and shoulder sections of the casing
2Reliability
If a projectile casing has irregular shape, then the manufacturing cost is low, but the pressure distribution and spin consistency deteriorate affecting accuracy
Solution Approach 1:
The die and mandrel system performs multiple functions simultaneously: it resizes the casing to correct dimensional irregularities, reshapes the neck and shoulder sections for proper projectile engagement, and ensures uniform wall thickness distribution. This multi-functional approach integrates several correction operations into a single modification step
Solution Approach 2:
The modification system applies different shaping forces to different sections of the casing based on their specific requirements. The die cavity provides overall dimensional control while the mandrel specifically addresses the neck and shoulder sections, ensuring each part of the casing receives the appropriate level of precision and shaping
3Reliability
If environmental factors are present during firing, then the operational conditions are realistic, but the projectile performance consistency deteriorates due to temperature and humidity effects
Solution Approach 1:
The modification system changes the physical parameters of the casing by forcibly reshaping it under controlled pressure, altering its dimensional parameters (length, diameter, wall thickness) and geometric parameters (shoulder angle, neck curvature). These parameter changes ensure the casing maintains its specified dimensions and shape within tight tolerances regardless of subsequent environmental variations during storage and firing
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
Improves the accuracy and consistency of projectile firing by ensuring uniform pressure distribution and reducing irregularities in the casing, leading to more predictable projectile performance.
Implementation Method 1
A system and method using a die and mandrel to reshape and resize projectile casings by inserting a mandrel into a die, securing the casing, and extracting the mandrel to uniformly modify the casing's neck and shoulder sections
Data Source
AI summary
An apparatus, system, computer-readable medium, process, die, or combination thereof to modify a projectile casing. For example, a die and mandrel can be used to shape, resize, or otherwise modify a projectile casing. A die can include different portions or sections, where the portions or sections are designed to shape or size different portions of the projectile casing such as the neck, shoulder, or body of a projectile casing. A method to insert a projectile casing into a die, where the die already includes a mandrel, and then extracting the mandrel while the die and projectile casings are held in place.