Additive Manufacturing Fluid Control for Internal Lattice Structures
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Solution Overview
Problem
Current additive manufacturing systems face challenges in achieving precise control over fusing and detailing processes, particularly in forming internal structures like lattices with small cell dimensions, which can result in structural weaknesses and defects due to excessive use of detailing agents.
Innovation Solution
The system differentiates between internal and external structural features of a 3D object, selectively applying fusing and detailing agents based on the type of feature, reducing the use of detailing agents where possible to prevent overheating and structural weaknesses, and optimizing the manufacturing process for improved mechanical properties and reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If detailing agents are used to inhibit unwanted fusing adjacent to desired fusing locations, then fusing precision is improved, but structural weaknesses and defects occur in internal structures like lattices with small cell dimensions
Solution Approach 1:
The patent applies different detailing agent quantities to different regions of the build volume. External surfaces receive higher detailing agent quantities for precise edge definition, while internal structures receive reduced or zero detailing agent quantities to maintain structural integrity. This spatial variation in detailing agent application resolves the contradiction by optimizing for precision where needed and strength where critical.
2Manufacturing precision
If detailing agents are applied to control powder fusing, then edge definition is improved, but excessive use causes overheating and structural weaknesses
Solution Approach 1:
The patent implements partial action by applying detailing agents only where needed for edge definition, rather than uniformly across all regions. The system calculates optimal detailing agent quantities based on local geometric features, applying sufficient agent for external edges while using reduced or zero quantities for internal structures, thereby preventing overheating while maintaining edge definition quality.
3Ease of manufacture
If uniform detailing agent parameters are used for all structural features, then process simplicity is maintained, but mechanical properties deteriorate due to excessive detailing agent in internal features
Solution Approach 1:
The patent transitions from uniform to localized detailing agent parameters by calculating region-specific quantities based on whether structures are external or internal. The system automatically differentiates between these regions and applies appropriate detailing agent quantities, improving mechanical properties while maintaining automated process simplicity through algorithmic differentiation rather than manual intervention.
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 enhances the mechanical properties and quality of the final object by reducing the need for excessive detailing agents, minimizing defects, and lowering manufacturing costs by allowing controlled fusing in internal features where necessary, while maintaining precision on external surfaces.
Implementation Method 1
a fusing agent (FA) fluid can be used to promote a build powder's absorption of energy from an energy source, to promote heating, melting, and fusing of the build powder
Implementation Method 2
the DA has the effect of reducing the heating effect of this radiation on build powder that it is applied to
Data Source
AI summary
Disclosed are systems, control mechanisms and methods that apply different printer control fluid parameters when forming internal and external features of a three-dimensional object within an additive manufacturing system. The identification of internal and external features may involve analysing an object model, comprising data describing the object to be manufactured, to identify all edges of a three-dimensional object and determining which of the edges are internal edges and which are external edges of the object. A control fluid strategy can be optimised for different object feature types, to improve mechanical properties of the final object and/or reduce usage of detailing agent.