3D Printing Coalescing Agent Control for Variable Properties
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Solution Overview
Problem
Existing additive manufacturing systems struggle to produce three-dimensional objects with controllable and variable properties, such as surface roughness, strength, and accuracy, due to limitations in material solidification and design features.
Innovation Solution
The system employs a combination of coalescing and coalescence modifier agents, selectively delivered and controlled by a microprocessor, to modulate the solidification process of build material layers, allowing for variable object properties through precise energy application and agent distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional additive manufacturing systems use standard solidification processes, then objects can be produced with basic structural integrity, but object properties such as surface roughness, strength, and accuracy cannot be controllably varied
Solution Approach 1:
The patent applies local quality by selectively delivering coalescing and coalescence modifier agents to different regions of the build material layer. This enables different portions of the object to have different properties (e.g., smooth vs. rough surfaces, varying strength) by controlling agent distribution patterns, thereby achieving controllable property variation while maintaining manufacturing precision in specific regions.
Solution Approach 2:
The patent changes physical and chemical parameters of the build material by introducing coalescing agents that modify surface tension and coalescence behavior. By adjusting agent concentration, delivery timing, and energy application parameters, the system achieves controllable variation in object properties including surface roughness, strength, and accuracy.
2Strength
If coalescing agents are applied to build material layers, then inter-layer bonding is enhanced and object strength improves, but coalescence bleed may occur causing loss of dimensional accuracy
Solution Approach 1:
The patent introduces coalescence modifier agents as intermediaries that mediate between the coalescing agents and the build material. These modifiers control the coalescence process to achieve desired bonding strength while preventing excessive coalescence bleed, thus maintaining dimensional accuracy. The modifier acts as a controlling intermediary that balances bonding enhancement with precision preservation.
Solution Approach 2:
The patent applies preliminary anti-action by delivering coalescence modifier agents in advance or simultaneously with coalescing agents to prevent excessive coalescence bleed before it occurs. This preemptive control mechanism ensures that while inter-layer bonding is enhanced, dimensional accuracy is preserved by counteracting potential harmful effects of uncontrolled coalescence.
3Adaptability or versatility
If multiple agents are selectively delivered to modulate solidification, then variable object properties are achieved, but system complexity increases
Solution Approach 1:
The patent applies universality by designing the agent delivery system to perform multiple functions: delivering coalescing agents, delivering coalescence modifier agents, and controlling energy application. This multi-functional approach achieves variable object properties while managing system complexity through integrated control rather than separate specialized systems for each function.
Solution Approach 2:
The patent merges the delivery of coalescing agents and coalescence modifier agents into a unified selective delivery system controlled by a single processor. This combination approach achieves controllable property variation while reducing overall system complexity compared to having entirely separate delivery and control systems for each agent type.
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
Enables the generation of three-dimensional objects with controllably variable properties, such as surface roughness, strength, and accuracy, by managing coalescence bleed and enhancing inter-layer bonding.
Implementation Method 1
a coalescing agent to a layer of build material provided on a support. The coalescing agent may modify a surface of the build material to promote bonding and coalescence of the build material
Implementation Method 2
applying energy to the layer of build material
Implementation Method 3
a coalescence modifier agent to the layer of build material provided on the support. The coalescence modifier agent may modify coalescence of the build material
Data Source
Figure 1
Figure 2a~2g
Figure 3
AI summary
According to one aspect there is provided apparatus for generating a three-dimensional object. The apparatus comprises a first agent distributor to selectively deliver a coalescing agent onto portions of a layer of build material, a second agent distributor to selectively deliver a coalescence modifier agent onto portions of a layer of build material, and a controller to control the agent distributors to selectively deliver each of the agents onto a layer of build material in respective patterns derived from data representing a slice of a three-dimensional object to be generated, wherein the coalescence modifier agent is delivered adjacent to where the coalescing agent is delivered to help reduce the effect of lateral coalescence bleed, so that when energy is applied to the layer the build material coalesces and solidifies to form a slice of the three-dimensional object in accordance the patterns.