Metal Injection Molding for Ammunition Projectile Manufacturing

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Solution Overview

Problem

Conventional methods for producing ammunition projectiles are limited by the materials that can be used and are time-consuming, lacking uniformity and consistency in manufacturing processes.

Innovation Solution

The method involves metal injection molding using a powdered metal feedstock with binding agents, where the process includes injection molding, debinding, and sintering to form projectiles with specific dimensions and compositions, allowing for the use of various metals and alloys such as stainless steel, brass, and tungsten, and the option to apply a metal coating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional machining or casting methods are used to produce projectiles, then material selection is limited and manufacturing time is lengthy, but the processes lack uniformity and consistency

Engineering Contradiction:

Improveuniformity and consistencyVSAvoidmanufacturing time

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent applies metal injection molding (MIM) technology to transform the manufacturing process parameters from conventional machining/casting to injection molding followed by sintering. This parameter change enables high-volume production with consistent quality, resolving the contradiction between manufacturing precision and productivity by establishing a standardized, repeatable process that reduces variability while accelerating production.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces traditional mechanical machining and casting operations with an injection molding system that uses material feedstock injection. This substitution introduces automated, programmable control to the manufacturing process, ensuring uniformity through precise control of injection parameters while significantly reducing manufacturing time compared to manual or batch-based conventional methods.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If conventional machining or casting methods are used to produce projectiles, then manufacturing time is lengthy, but material options remain limited

Engineering Contradiction:

Improvematerial optionsVSAvoidmanufacturing time

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent utilizes metal injection molding feedstock that can incorporate various metal powders including stainless steel, brass, and tungsten, either individually or in combination. This composite material approach allows versatile material selection while maintaining efficient production, as the MIM process handles diverse metal powders uniformly through the same injection and sintering operations, expanding material options without increasing manufacturing time.

Inventive Principle:

Principle #40Composite materials

3Productivity

If metal injection molding is used to produce projectiles, then manufacturing time is reduced and material options are expanded, but the process requires multiple steps including injection molding, debinding, and sintering

Engineering Contradiction:

Improvemanufacturing timeVSAvoidprocess steps

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent combines multiple manufacturing operations into an integrated metal injection molding process. The injection molding step creates the green compact, debinding removes organic binders, and sintering densifies the metal powder - all in a unified sequential process. This merging of steps, while adding process complexity, actually reduces total manufacturing time compared to conventional methods by eliminating multiple separate machining and assembly operations, thus resolving the contradiction between productivity and device complexity.

Inventive Principle:

Principle #5Merging (Combining)

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 enables the production of projectiles with consistent ballistic performance, expanded material options, and reduced manufacturing time, ensuring uniformity and improved properties such as strength and durability.

Implementation Method 1

injection molding the metal injection molding feedstock into the projectile mold to form a first projectile having a first size

Methodology Applied

Scientific EffectInjection molding:

Implementation Method 2

debinding the first projectile to remove the first binding agent

Methodology Applied

Scientific EffectThermal decomposition: Pyrolysis

Implementation Method 3

sintering the first projectile to remove the second binding agent and form a projectile having a second size

Methodology Applied

Scientific EffectSintering: Sintering

Data Source

PatentUS10081057B2Method of making a projectile by metal injection molding

Publication Date: 2018.09.25 TRUE VELOCITY IP HOLDINGS LLC

AI summary

The present invention provides a method of making a metal ammunition projectile by metal injection molding comprising the steps of: providing a projectile mold to form a nose extending essentially symmetrically to a shoulder; and an essentially cylindrical bearing surface extending from the shoulder to a base; providing a metal injection molding feedstock comprising a powdered metal and a first binding agent and a second binding agent; injection molding the metal injection molding feedstock into the projectile mold to form a first projectile having a first size; debinding the first projectile to remove the first binding agent; and sintering the first projectile to remove the second binding agent and form a projectile having a second size.