Additive Manufacturing Gas Flow Control for Plume Steering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The presence of emissions plumes in additive manufacturing can cause detrimental effects such as blockage or reduction in energy beam intensity, preventing rapid beam scanning or the use of multiple beams due to intersections with the energy beams.
Innovation Solution
A method is employed to control the trajectory of emissions plumes by varying the magnitude or direction of the gas flow, using models or real-time sensing to prevent interactions between the energy beams and plumes, allowing for the modification of the gas flow to steer the plumes away from the beam path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the energy beam is used to selectively fuse powder in additive manufacturing, then the workpiece is formed layer-by-layer, but the beam intersects with emissions plumes causing blockage and reduced beam intensity
Solution Approach 1:
The gas flow parameters (magnitude and direction) are dynamically adjusted in real-time based on detected plume trajectories. The system varies gas flow to actively control plume trajectories, ensuring plumes are steered away from energy beam paths during scanning operations, thereby preventing beam blockage and maintaining consistent beam intensity throughout the build process
Solution Approach 2:
The system employs real-time sensing to detect plume positions and trajectories, then feeds this information back to the gas flow control system. This closed-loop feedback mechanism allows the gas flow to be continuously adjusted based on actual plume behavior, enabling the system to adapt to varying plume trajectories and maintain effective beam-plume separation
2Productivity
If rapid beam scanning or multiple beams are used to increase productivity, then the build process accelerates, but beam-plume intersections occur more frequently causing detrimental effects
Solution Approach 1:
The gas flow control system dynamically adjusts flow magnitude and direction in real-time to track and counteract plume trajectories generated during rapid scanning. This dynamic adaptation allows the system to maintain effective plume management even at high scanning speeds where plume positions change rapidly
Solution Approach 2:
Real-time plume detection provides continuous feedback that enables the gas flow system to respond to plume trajectories generated during rapid scanning. This feedback loop ensures that even when multiple beams or high-speed scanning creates complex plume patterns, the system can adaptively adjust gas flow to maintain beam-plume separation
3Object-generated harmful factors
If the gas flow is increased to clear plumes from the build chamber, then plume removal is improved, but the plume trajectory control precision is reduced
Solution Approach 1:
Instead of uniformly increasing gas flow throughout the build chamber, the system applies localized gas flow adjustments in specific regions where plumes are detected. By varying gas flow magnitude and direction locally near plume locations, the system achieves effective plume steering without the turbulence and loss of precision that would result from global flow increases
Solution Approach 2:
The real-time plume detection system provides feedback that enables precise, localized gas flow adjustments. The system applies gas flow control only where and when needed based on actual plume positions, maintaining trajectory control precision while achieving effective plume management without excessive overall gas flow
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 enables the use of multiple energy beams and rapid scanning, improving part quality by maintaining uniform energy beam density and focus, while avoiding beam-plume intersections that can lead to blockages or reduced intensity.
Implementation Method 1
the interaction of the radiant energy beam with the powder causes vaporization of the powder, generating a plume which originates in the vicinity of the melt pool
Implementation Method 2
a plume which originates in the vicinity of the melt pool and travels downstream, entrained in the shielding gas flow
Implementation Method 3
The shielding gas is used to transfer heat away from the surface of the powder bed
Implementation Method 4
At downstream locations, the vapor cools and condenses so that the plume comprises a mixture of gas and metallic particles (condensate)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method of controlling an additive manufacturing process in which one or more energy beams are used to selectively fuse a powder contained in a build chamber having a gas flow therein in order to form a workpiece, in the presence of one or more plumes generated by interaction of the one or more energy beams with the powder. The method includes controlling a trajectory of at least one of the plumes, so as to prevent the one or more energy beams from intersecting the one or more plumes.