Selective Functional Agent Deposition for 3D Printing Surface Quality
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Solution Overview
Problem
Three-dimensional printing systems face challenges in producing high-quality objects with well-defined surfaces and stability, often resulting in issues like lifted edges, curling, and poor surface definition due to uneven solidification and thermal bleed, especially when using powdered materials prone to displacement.
Innovation Solution
The system controls the amount of functional agents, such as binders, fusing agents, and detailing agents, based on a distance function relative to the object's surface, adjusting their application density to prevent displacement and thermal bleed, using a print controller to modulate the amount of functional agents deposited on each layer based on its distance from the object's surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If functional agents are selectively deposited to solidify build material particles, then object fabrication is achieved, but surface quality deteriorates with lifted edges and poor definition
Solution Approach 1:
The patent applies different amounts of functional agent based on local characteristics of the build material layer. Areas with higher risk of displacement or thermal bleed receive reduced functional agent application, while other areas receive standard application. This localized differentiation resolves the contradiction by improving surface quality in vulnerable areas without compromising overall object stability.
Solution Approach 2:
The patent dynamically adjusts the amount of functional agent as a variable parameter based on real-time assessment of displacement risk and thermal bleed susceptibility. By changing the functional agent application parameter spatially and layer-by-layer, the system achieves both high surface quality and object stability, resolving the contradiction between precision and reliability.
2Manufacturing precision
If functional agents are applied to fuse particles together, then layer solidification is achieved, but thermal bleed causes poor surface definition
Solution Approach 1:
The patent identifies areas susceptible to thermal bleed before functional agent application and preemptively reduces functional agent deposition in those regions. This preliminary anti-action prevents thermal bleed from occurring in the first place, thereby maintaining sharp surface definition while still achieving adequate solidification in non-susceptible areas.
Solution Approach 2:
The patent creates a spatially varying functional agent application profile where areas prone to thermal bleed receive reduced application rates. This local differentiation allows the system to maintain surface definition in vulnerable areas while preserving adequate fusion in other areas, resolving the contradiction between precision and temperature control.
3Productivity
If build material particles are processed layer by layer, then three-dimensional object fabrication is achieved, but material displacement occurs during functional agent deposition
Solution Approach 1:
The patent adjusts the functional agent application parameter based on the stability characteristics of each layer and region. By dynamically changing the amount of functional agent deposited, the system prevents material displacement in vulnerable areas while maintaining productive fabrication progress across the entire build volume, resolving the contradiction between productivity and precision.
Solution Approach 2:
The patent applies functional agent with spatially varying amounts based on local material stability assessment. Areas with high displacement risk receive reduced functional agent application, preventing material positioning errors, while other areas receive standard application to maintain fabrication productivity. This local differentiation resolves the contradiction between production efficiency and material precision.
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 improves surface quality, reduces 'bleed' effects, and enhances object stability by ensuring even solidification, reducing material displacement and clogging, thereby increasing print head reliability and overall object quality.
Implementation Method 1
Chemical agents, referred to as 'functional agents', may be selectively deposited onto each layer within the working area
Implementation Method 2
Energy may then be applied, such as using an infrared lamp, to fuse areas of a layer where fusing agent has been deposited
Implementation Method 3
In one case, the functional agent may comprise a binder that causes build material particles to coalesce
Data Source
AI summary
Certain examples described herein control an amount of a functional agent that is deposited in a three-dimensional printing system. In certain examples, an amount of a functional agent is controlled based on a distance function, wherein the distance function is associated with a distance between a particular portion of an object to be fabricated and a surface of the object. The functional agent may be a binder, a fusing agent or a detailing agent, amongst others.