Clustered Laser-Beam Steering for Powder-Bed Fusion Precision
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Solution Overview
Problem
Metal additive manufacturing using laser-based powder-bed fusion faces challenges such as low throughput, high-power laser beam inefficiencies leading to metal splatter and defects, and reduced manufacturing precision due to thermal management issues and high expense of high-power laser systems.
Innovation Solution
The use of a plurality of lower-power laser beams clustered into a doughnut-shaped or flat-top intensity profile, steered by a scanner to selectively melt powdered metal, reducing metal splatter and improving precision and thermal uniformity, while maintaining equivalent total power to high-power systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high-power laser beam is used to increase throughput, then productivity improves, but manufacturing precision deteriorates due to thermal management issues and metal splatter
Solution Approach 1:
The high-power laser beam is segmented into multiple lower-power laser beams (e.g., 7-13 beams) that are clustered together to form a composite beam. Each individual beam operates at a lower power level that avoids thermal management issues and metal splatter, while the collective arrangement of multiple beams achieves the required total power for high throughput. This segmentation resolves the contradiction by enabling high productivity through multiple controlled beams rather than a single high-power beam.
2Productivity
If a high-power laser beam is used to increase throughput, then productivity improves, but metal splatter and defects increase
Solution Approach 1:
The high-power laser beam is segmented into multiple lower-power laser beams (e.g., 7-13 beams) that are clustered together to form a composite beam. Each individual beam operates at a lower power level that avoids thermal management issues and metal splatter, while the collective arrangement of multiple beams achieves the required total power for high throughput. This segmentation resolves the contradiction by enabling high productivity through multiple controlled beams rather than a single high-power beam.
3Productivity
If a single high-power laser beam is used, then throughput increases, but process stability deteriorates
Solution Approach 1:
The high-power laser beam is segmented into multiple lower-power laser beams (e.g., 7-13 beams) that are clustered together to form a composite beam. Each individual beam operates at a lower power level that avoids thermal management issues and metal splatter, while the collective arrangement of multiple beams achieves the required total power for high throughput. This segmentation resolves the contradiction by enabling high productivity through multiple controlled beams rather than a single high-power beam.
4Manufacturing precision
If multiple lower-power laser beams are clustered together, then manufacturing precision and process stability improve, but device complexity increases
Solution Approach 1:
Multiple lower-power laser beams are merged into a single clustered beam structure that is steered by one scanner. The individual beams are spatially arranged in a specific pattern (e.g., doughnut-shaped or flat-top intensity profile) and move together as a unified group across the powder bed. This merging approach achieves high manufacturing precision and process stability while avoiding the complexity of multiple independent scanning systems, as a single scanner controls all beams simultaneously.
5Reliability
If multiple lower-power laser beams are clustered together, then process stability improves, but energy efficiency deteriorates
Solution Approach 1:
The clustered laser beams are arranged to create a specific intensity distribution pattern (e.g., doughnut-shaped or flat-top profile) that concentrates energy where needed while reducing it in other areas. This local quality control allows each beam to operate at an optimal power level for stable processing, and the overall energy distribution is optimized to improve energy efficiency compared to a single high-power beam that must operate uniformly across the entire target area.
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 enhances the stability and quality of the powder-bed fusion process, reducing defects and improving throughput by achieving more precise control over the melt pool and energy efficiency.
Implementation Method 1
a plurality of lasers to generate a plurality of laser beams
Implementation Method 2
steer the plurality of laser beams onto selected portions of a surface of the powder bed to melt powdered metal
Implementation Method 3
clusters of laser beams to selectively melt powdered metal
Implementation Method 4
selectively melt powdered metal
Data Source
AI summary
A metal additive manufacturing system includes a powder bed for powdered metal, a plurality of lasers to generate a plurality of laser beams, and a scanner to steer the plurality of laser beams onto selected portions of a surface of the powder bed. A method of metal additive manufacturing includes generating a plurality of laser beams and steering the plurality of laser beams, using a scanner, onto selected portions of a surface of a powder bed of powdered metal.