Additive Manufacturing Return Manifolds for Stable Inert Gas Flow
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Solution Overview
Problem
Additive manufacturing systems with movable build units and vessels face challenges in maintaining an inertized processing environment due to the evacuation of contaminants such as soot, fumes, and particulates.
Innovation Solution
Incorporation of a build unit and build vessel positioning system with an inertization system that includes an irradiation chamber, supply manifolds for process gas, and return manifolds to maintain an inert environment by flowing and evacuating process gas effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a build unit and build vessel are made movable relative to one another to enable large format additive manufacturing, then the productivity and manufacturing capability are improved, but the ability to maintain an inertized processing environment deteriorates
Solution Approach 1:
The inertization system is divided into separate functional components: supply manifolds for delivering inert gas, return manifolds for evacuating contaminants, and positioning systems for the build unit and vessel. This segmentation allows each component to be optimized independently while working together to maintain the inert environment during movable operations.
Solution Approach 2:
Inert gas acts as an intermediary substance that fills the processing chamber between the build unit and build vessel, creating a protective atmosphere. The supply manifolds deliver this intermediary gas to displace contaminants, while the return manifolds evacuate harmful byproducts, thus maintaining the inert environment during movable manufacturing operations.
2Manufacturing precision
If contaminants such as soot, fumes, and particulates are evacuated from the process chamber, then the quality of the additive manufacturing process is improved, but the complexity of the inertization system increases
Solution Approach 1:
The supply manifolds and return manifolds are integrated with the build unit and build vessel structures, combining multiple functions into unified components. This merging reduces the number of separate elements and simplifies the overall inertization system while maintaining effective contaminant evacuation and inert gas delivery.
Solution Approach 2:
The manifolds serve multiple functions: they deliver inert gas, evacuate contaminants, and structure the processing chamber. This multi-functionality reduces the need for separate dedicated components for each function, thereby reducing overall system complexity while maintaining high process quality.
3Reliability
If an inertized processing environment is maintained by supplying and evacuating process gas, then the reliability of the additive manufacturing process is improved, but the energy consumption increases
Solution Approach 1:
The supply manifolds continuously deliver inert gas and the return manifolds continuously evacuate contaminants, maintaining a stable inert environment throughout the manufacturing process. This continuous action ensures process reliability by preventing contaminant accumulation while optimizing energy use through sustained, efficient gas flow management.
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
The system ensures an inertized processing environment by preventing contaminants from depositing on energy beam system components and efficiently removing them, enhancing the quality and efficiency of the additive manufacturing process.
Implementation Method 1
one or more supply manifolds configured to supply process gas to the irradiation plenum
Implementation Method 2
a return manifold configured to receive and/or evacuate process gas from the irradiation plenum
Implementation Method 3
one or more irradiation devices respectively configured to direct one or more energy beams onto a region of a powder bed
Data Source
AI summary
A build unit for additively manufacturing three-dimensional objects may include an energy beam system, an irradiation chamber, an inertization system having a return manifold configured to evacuate a process gas from the irradiation chamber. The return manifold includes a plurality of return manifold bodies and return manifold inlet disposed at a bottom of the irradiation chamber. The plurality of return manifold bodies includes one or more return manifold pathways downstream of the return manifold inlet. The plurality of return manifold bodies also includes one or more recapture pathways positioned to receive the process gas into the one or more return manifold pathways that flows past the return manifold inlet.