Inertization Manifolds for Additive Manufacturing Build Units
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Solution Overview
Problem
Large format additive manufacturing systems with movable build units and vessels face challenges in maintaining an inertized processing environment, as contaminants like soot, fumes, and powder material are difficult to evacuate effectively.
Innovation Solution
The implementation of a build unit with an energy beam system, an inertization system, supply manifolds, and return manifolds, which includes downflow and crossflow manifolds to provide and evacuate process gas within the irradiation plenum, ensuring an inert environment and efficient removal of contaminants during the additive manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a movable build unit and build vessel configuration is used for large format additive manufacturing, then the manufacturing capability for large objects is improved, but the ability to maintain an inertized processing environment deteriorates
Solution Approach 1:
The gas flow system is segmented into multiple manifolds (supply manifolds and return manifolds) that are distributed throughout the build chamber. This segmentation allows independent control of gas flow in different regions, enabling effective inert environment maintenance even with the movable build unit configuration that creates complex contamination patterns.
Solution Approach 2:
The system introduces multi-directional gas flow paths (supply manifolds providing downward and lateral flow, return manifolds providing upward and lateral evacuation) to address the three-dimensional contamination challenges created by the movable build unit. This dimensional approach to gas flow control effectively manages contaminants throughout the entire build volume.
2Reliability
If process gas is supplied to evacuate contaminants during additive manufacturing, then the inert environment is improved, but the system complexity increases
Solution Approach 1:
The manifold system performs multiple functions simultaneously: supply manifolds provide both downward gas flow for inertization and lateral flow for contaminant removal, while return manifolds provide both upward evacuation and lateral collection. This multi-functionality reduces the need for separate dedicated components for each function, thereby managing complexity while maintaining reliable inert environment.
3Productivity
If downflow and crossflow manifolds are used to provide process gas, then the contaminant removal efficiency is improved, but the device complexity increases
Solution Approach 1:
The system merges the downflow manifold and crossflow manifold into an integrated gas distribution network. The supply manifolds combine downward-facing ports for inertization with lateral ports for contaminant removal, while return manifolds similarly combine upward evacuation with lateral collection. This merging of functions into unified manifold structures improves contaminant removal efficiency without proportionally increasing device complexity.
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 configuration maintains an inert environment, prevents contaminants from depositing on energy beam system components, and efficiently removes process gas and contaminants, enhancing the quality and efficiency of the additive manufacturing process.
Implementation Method 1
The one or more supply manifolds may include a downflow manifold configured to provide a downward flow of a process gas through at least a portion of the irradiation plenum defined by the irradiation chamber
Implementation Method 2
The return manifold may evacuate or otherwise remove process gas from the irradiation plenum defined by the irradiation chamber
Implementation Method 3
The energy beam system may include one or more irradiation devices respectively configured to direct one or more energy beams onto a region of a powder bed
Implementation Method 4
The one or more inward downflow manifold walls may diverge from a longitudinal axis of the downflow manifold body in a proximal direction relative to the powder bed at a divergence angle allowing the one or more energy beams of the energy beam system to access the portion of the powder bed corresponding to a scan field
Data Source
AI summary
A build unit for additively manufacturing three-dimensional objects may include an energy beam system having one or more irradiation devices respectively configured to direct one or more energy beams onto a region of a powder bed, and an inertization system including an irradiation chamber defining an irradiation plenum, one or more supply manifolds, and a return manifold. The one or more supply manifolds may include a downflow manifold configured to provide a downward flow of a process gas through at least a portion of the irradiation plenum defined by the irradiation chamber, and/or a crossflow manifold configured to provide a lateral flow of the process gas through at least a portion of the irradiation plenum defined by the irradiation chamber. The return manifold may evacuate or otherwise remove process gas from the irradiation plenum defined by the irradiation chamber.