Progressive Roller Depowdering for Elastic 3D-Printed Lattices
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Solution Overview
Problem
It is difficult to thoroughly remove unfused build material from latticed midsoles and other elastic objects produced by powder-based 3D printing, particularly those with complex geometries, due to agglomerated clumps trapped in the lattice structure.
Innovation Solution
A depowdering process involving progressive compression of the object between rollers, combined with air blowing and vacuuming, to loosen and remove unfused build material from elastic objects, including latticed midsoles, using a system with a conveyor and controlled compression devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional depowdering methods are used, then simple objects can be cleaned, but latticed structures with agglomerated clumps cannot be thoroughly depowdered
Solution Approach 1:
The patent applies dynamic compression by progressively compressing the lattice structure from one end to the other, creating moving compression zones that flex and loosen agglomerated build material throughout the complex geometry, enabling effective depowdering of latticed structures that static methods cannot handle
Solution Approach 2:
The patent uses pressurized air to blow loose and loosened build material out of the lattice structure during compression, and vacuum to remove the blown-out material, creating a pneumatic-hydraulic system that efficiently removes depowdered particles from complex geometries
2Productivity
If manual depowdering processes are used, then small batches can be processed, but throughput is low
Solution Approach 1:
The patent implements continuous depowdering by processing objects along a conveyor belt through multiple compression rollers in sequence, maintaining continuous motion and compression action throughout the depowdering process, which significantly increases throughput compared to batch processing while managing system complexity through modular roller units
Solution Approach 2:
The patent divides the depowdering process into multiple compression zones with several rollers arranged along the conveyor, segmenting the overall depowdering task into progressive compression stages that can be managed independently while contributing to the overall throughput improvement
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
Enhances the depowdering operation's throughput and effectiveness in breaking up clumps of unfused build material, especially in lattice structures, by fluidizing and removing it efficiently.
Implementation Method 1
compressing the midsole progressively from one end of the midsole to the other end of the midsole to flex each part of the lattice structure
Implementation Method 2
loose and loosened build material may be blown out of the lattice structure and off the midsole with pressurized air
Implementation Method 3
vacuumed away for collection and recycling
Data Source
AI summary
In one example, a process for depowdering an elastic object made with a 3D printer using powdered build material includes compressing the object progressively from one end of the object to another end of the object.