3D Additive Fabrication Using Immiscible Support Fluid

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Solution Overview

Problem

Conventional additive manufacturing methods, particularly stereolithography, require extensive use of sacrificial support structures that increase print time, material waste, and post-processing costs due to the inability to adjust build surface planarity and use of single-material composition, leading to a high quantity of support structures.

Innovation Solution

The method involves submerging the build platform into a support fluid during construction, where a resin layer is polymerized above the fluid, eliminating the need for traditional support structures by providing physical support through the fluid's immiscibility with the resin.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If sacrificial support structures are used to stabilize overhangs during printing, then structural stability is improved, but print time increases and material waste occurs

Engineering Contradiction:

Improvestructural stabilityVSAvoidprint time

Core Design Contradiction:

StrengthVSProductivity

Solution Approach 1:

The patent introduces a liquid support medium as an intermediary substance between the build platform and the overhanging geometry. This liquid medium provides temporary support during fabrication, allowing complex geometries to be printed without traditional sacrificial support structures. The support medium can be removed after printing without damaging the final part, thus eliminating the need for time-consuming support structure printing and removal.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If sacrificial support structures are used to build overhangs, then structural stability is improved, but material waste increases

Engineering Contradiction:

Improvestructural stabilityVSAvoidmaterial waste

Core Design Contradiction:

StrengthVSLoss of substance

Solution Approach 1:

The liquid support medium serves as a reusable intermediary that supports overhanging geometry during printing without being consumed. Unlike traditional sacrificial supports that must be printed and then discarded, the liquid support medium can be recovered and reused across multiple printing operations, significantly reducing material waste.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If traditional support structures are used, then structural stability is improved, but post-processing complexity increases

Engineering Contradiction:

Improvestructural stabilityVSAvoidpost-processing complexity

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The liquid support medium is designed to be easily removable after printing, either through evaporation, dissolution, or simple mechanical removal, leaving no residue or damage to the final part. This eliminates the complex post-processing steps required to remove traditional support structures, including manual cutting, sanding, and cleaning.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Ease of operation

If dissolvable support material is used to reduce manual removal, then ease of operation is improved, but system complexity increases

Engineering Contradiction:

Improvesupport structure removalVSAvoidsystem complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent employs a liquid support medium that leverages hydraulic principles to provide support during printing. The liquid medium can be easily introduced and removed from the printing chamber using simple fluid handling mechanisms, avoiding the need for complex dissolvable support material systems while maintaining ease of operation.

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

This approach reduces the need for support structures in additive manufacturing, minimizing material waste, print time, and post-processing costs, while enabling the creation of complex geometries without the need for manual support removal.

Implementation Method 1

This fluid provides physical support to structures that would otherwise require the use of support structures in prior additive manufacturing systems

Methodology Applied

Scientific EffectBuoyancy: Archimedes' Principle (Buoyancy)

Implementation Method 2

irradiating at least a portion of the resin layer at the fluid interface with light to polymerize an irradiated portion of the resin layer as a current build layer of the three-dimensional workpiece

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentUS20240278494A1Three-dimensional additive fabrication with support fluid

Publication Date: 2024.08.22 GEORGIA TECH RES CORP

AI summary

This disclosure provides methods and systems for the additive manufacturing of three-dimensional workpieces using a support fluid build. In one aspect, a method is provided for forming a three-dimensional workpiece, the method comprising dispensing a resin in a liquid state into a container, irradiating at least a portion of the resin layer at the fluid interface with light to polymerize an irradiated portion of the resin layer as a current build layer of the three-dimensional workpiece at the fluid interface, wherein a portion of the three-dimensional workpiece is affixed to a build platform immersed in the support fluid; and advancing the build platform to a next position in the support fluid to submerge the current build layer within the support fluid. The process is repeated to successively build the workpiece in the support fluid.