Laser Array Beam Diffusion for Uniform Melt Pool Control
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Solution Overview
Problem
Existing additive manufacturing systems, such as direct metal laser melting, face challenges in achieving consistent component quality due to variations in melt pool depth and thermal conductivity, leading to poor surface finish and reduced dimensional accuracy.
Innovation Solution
An additive manufacturing system employing a laser array with an optical element that induces power diffusion in energy beams to control melt pool characteristics, resulting in a more uniform power density distribution across the beam spot pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high-powered laser device is used to melt metal powder, then manufacturing efficiency is improved, but melt pool depth variation increases leading to poor surface finish
Solution Approach 1:
The patent applies local quality by varying the power density distribution across different regions of the laser beam. By creating a Gaussian-like power distribution where the center has higher power density and edges have lower power density, the system achieves uniform melt pool depth across the entire scan path, improving surface finish while maintaining high manufacturing efficiency.
Solution Approach 2:
The patent changes the power density parameter by introducing a power diffusion profile across the laser beam cross-section. This parameter modification ensures that the power density at the beam center is higher than at the edges, compensating for heat conduction losses and maintaining consistent melt pool characteristics throughout the melting process.
2Productivity
If laser power density is increased to improve manufacturing speed, then productivity increases, but melt pool depth becomes too deep causing poor surface finish
Solution Approach 1:
The patent implements local quality by applying different power densities to different spatial locations within the laser beam cross-section. The central region receives higher power density to maintain melting temperature, while peripheral regions receive lower power density to prevent excessive penetration, achieving controlled melt pool depth at high manufacturing speeds.
Solution Approach 2:
The patent uses partial action by applying excessive power density only where needed (at the beam center) rather than uniformly across the entire beam. This localized excessive power application compensates for heat conduction losses without causing overall overheating or excessive melt pool depth.
3Device complexity
If conventional laser heating is used, then manufacturing process is simple, but thermal conductivity variations cause melt pool depth inconsistency
Solution Approach 1:
The patent modifies the power density parameter by implementing a diffusion-based power distribution profile across the laser beam. This parameter change compensates for thermal conductivity variations in the metal powder and substrate, ensuring consistent heat distribution and uniform melt pool depth without significantly 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 approach enables consistent and predictable manufacturing of large areas by controlling melt pool depth and thermal conductivity variations, improving surface finish and dimensional accuracy.
Implementation Method 1
inducing a predetermined power diffusion in the energy beam
Implementation Method 2
Each laser device of the plurality of laser devices generates an energy beam for forming a melt pool in a powder bed
Implementation Method 3
conductive heat transfer between the powdered metal and the surrounding solid material of the component
Implementation Method 4
forming a melt pool in a powder bed
Data Source
AI summary
An additive manufacturing system includes a laser array including a plurality of laser devices. Each laser device of the plurality of laser devices generates an energy beam for forming a melt pool in a powder bed. The additive manufacturing system further includes at least one optical element. The optical element receives at least one of the energy beams and induces a predetermined power diffusion in the at least one energy beam.