Powder-Bed Fusion Laser Clustering for Faster, Cleaner Metal Builds
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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 defocusing, which results in unstable and low-quality products.
Innovation Solution
The use of a plurality of lower-power laser beams clustered into a doughnut-shaped or flat-top intensity profile, steered and adjusted to form precise melt pools with uniform thermal profiles, reducing metal splatter and enhancing manufacturing precision and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-power laser beams are used to increase build speed, then productivity improves, but manufacturing precision deteriorates due to defocusing and metal splatter
Solution Approach 1:
The patent divides a single high-power laser beam 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 lower power, avoiding the defocusing and splatter issues, while the clustered arrangement maintains the overall energy density needed for efficient melting and high build speed.
2Productivity
If high-power laser beams are used to increase melting efficiency, then productivity improves, but harmful factors increase due to metal splatter and defects
Solution Approach 1:
The patent segments the high-power laser beam into multiple lower-power beams, each operating below the threshold that causes metal splatter and vaporization. This segmentation maintains overall melting efficiency through clustered energy delivery while eliminating the harmful splatter effects associated with single high-power beams.
Solution Approach 2:
The patent changes the power parameter of individual laser beams from high-power to lower-power levels, and adjusts the spatial arrangement into clustered patterns. This parameter change transforms the interaction between laser and metal powder, achieving efficient melting without the splatter and defects caused by excessive single-beam power.
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 increases build speed and precision, reduces defects, and improves the stability and quality of metal additive manufacturing products by controlling the intensity and thermal profiles of the laser beams, leading to more efficient melting and better material properties.
Implementation Method 1
generating a plurality of laser beams and directing the plurality of laser beams to selected portions of a surface of a powder bed of powdered metal
Implementation Method 2
forming precise melt pools with uniform thermal profiles
Data Source
AI summary
A method of metal additive manufacturing includes generating a plurality of laser beams and directing the plurality of laser beams to selected portions of a surface of a powder bed of powdered metal. The method also includes monitoring the powder bed while performing the generating and directing, and adjusting at least one of the generating or directing based on the monitoring.