Swirling Fluidization for Additive Manufacturing De-Powdering

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Solution Overview

Problem

The de-powdering process in binder jet additive manufacturing is challenging due to the lack of effective methods to remove unbound powder from green parts without damaging them, as they have insufficient handling strength and are susceptible to damage during conventional processes.

Innovation Solution

A fluidization mechanism is used to create a swirling fluid flow within a support chamber, fluidizing the unbound powder and generating a negative pressure to keep the green objects intact, allowing easy evacuation of the powder while minimizing damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of substance

If conventional de-powdering methods are used, then unbound powder can be removed, but green parts are damaged due to insufficient handling strength

Engineering Contradiction:

Improveunbound powder removalVSAvoidgreen part integrity

Core Design Contradiction:

Loss of substanceVSReliability

Solution Approach 1:

The patent uses a fluidization mechanism that introduces gas flow through the powder bed to fluidize unbound powder particles, allowing them to be removed through suction without mechanical contact that would damage the green parts. The gas flow selectively mobilizes loose powder while leaving bound green part material intact.

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The patent replaces conventional mechanical de-powdering methods (such as brushing, scraping, or mechanical agitation) with a pneumatic fluidization system. This substitution eliminates direct mechanical contact between de-powdering tools and the fragile green parts, preventing damage while effectively removing unbound powder.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Loss of substance

If manual de-powdering is performed, then powder removal is possible, but labor intensity is high and productivity is low

Engineering Contradiction:

Improvepowder removal efficiencyVSAvoidde-powdering throughput

Core Design Contradiction:

Loss of substanceVSProductivity

Solution Approach 1:

The fluidization mechanism enables the powder bed to self-fluidize through gas flow, and the suction system automatically removes fluidized powder without requiring manual intervention. This automated self-service system eliminates labor-intensive manual de-powdering operations while maintaining effective powder removal.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent employs a pneumatic system combining gas flow introduction and vacuum suction to automate the de-powdering process. This pneumatic automation replaces manual labor, significantly increasing productivity while effectively removing unbound powder from the build chamber.

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Productivity

If high flow rate is used in fluidization mechanism, then powder evacuation is faster, but green bodies are damaged due to excessive force

Engineering Contradiction:

Improvepowder evacuation speedVSAvoidgreen body handling strength

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The patent employs dynamic control of the fluidization process, adjusting gas flow rates and suction pressures to optimize powder removal while protecting green parts. The system adapts flow parameters to fluidize and remove powder efficiently without applying excessive force that would damage the fragile green bodies.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The pneumatic system uses controlled gas flow and vacuum suction to create optimal fluidization conditions. By regulating the pneumatic parameters, the system achieves fast powder evacuation through controlled fluidization while maintaining forces below the damage threshold of green parts.

Inventive Principle:

Principle #29Pneumatics and hydraulics

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

The method significantly reduces labor and improves the yield of undamaged green objects by fluidizing the powder, making it easier to evacuate and filter out, thus preserving the integrity of the additively manufactured parts.

Implementation Method 1

A fluidization mechanism is used to create a swirling fluid flow within a support chamber, fluidizing the unbound powder

Methodology Applied

Scientific EffectFluidization: Fluidisation

Implementation Method 2

generating a negative pressure to keep the green objects intact

Methodology Applied

Scientific EffectNegative pressure: Pressure Gradient

Data Source

PatentUS20250319519A1De-powdering of additive manufacturing build

Publication Date: 2025.10.16 GENERAL ELECTRIC CO

AI summary

A de-powdering system includes one or more sidewalls defining a support chamber configured to contain an additive manufacturing build where the additive manufacturing build includes one or more objects disposed within a powder build material. A fluidization mechanism is fluidically couplable to a fluid source and includes one or more flow channels fluidically coupled to the support chamber. The fluid source is actuatable to provide a fluid from the fluid source to the support chamber and inject the fluid into the support chamber via the one or more flow channels. The one or more flow channels are oriented to introduce a swirling flow of the fluid into the support chamber to fluidize at least a portion of the powder build material within the support chamber.