Laser Diode Array Layout for Uniform Powder Bed Fusion Irradiation
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Solution Overview
Problem
Existing additive manufacturing systems face challenges in achieving uniform power density and control over melt pool geometry during powder bed fusion processes, leading to variability in build quality and processing speed.
Innovation Solution
The use of a plurality of laser diode arrays configured to provide an alternating pattern or sequence of beam spots with a lower intensity and power density, allowing for increased resolution and improved temperature control, which reduces thermal interactions and enhances the uniformity of power density at build points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single high-intensity laser beam is used for powder bed fusion, then processing speed is improved, but uniformity of power density and control over melt pool geometry deteriorate
Solution Approach 1:
The patent divides a single high-power laser beam into multiple lower-power beam spots arranged in arrays. These segmented beams are distributed across the build area and can be independently controlled, allowing simultaneous processing of multiple locations while maintaining uniform power density at each spot. This segmentation enables both high throughput and precise control of melt pool geometry.
Solution Approach 2:
The patent transitions from a single-point irradiation approach to a multi-point spatial distribution approach. By arranging beam spots in two-dimensional arrays across the build area, the system adds spatial dimensionality to the irradiation process, enabling parallel processing while maintaining control over each individual melt pool.
2Productivity
If a single high-intensity laser beam is used for powder bed fusion, then processing speed is improved, but control over melt pool geometry deteriorates
Solution Approach 1:
By segmenting the laser energy into multiple independent beam spots, each spot can be precisely controlled to create consistent melt pool geometries. The segmentation allows independent adjustment of each beam's parameters to achieve desired melt pool shapes while maintaining high overall processing speed through parallel operation.
Solution Approach 2:
Each beam spot in the array can be independently controlled with local quality adjustments, allowing precise control over melt pool geometry at each processing location. This local control ensures consistent melt pool shapes across the entire build area while maintaining high throughput.
3Productivity
If higher power density is used to increase processing speed, then productivity is improved, but thermal interactions between adjacent build points increase
Solution Approach 1:
Segmenting the total power into multiple lower-power beam spots reduces the thermal influence zone of each individual spot. This segmentation allows beams to be positioned closer together without excessive thermal interaction, enabling higher overall processing speed while maintaining controlled thermal fields at each location.
Solution Approach 2:
The patent changes the power density parameter by distributing total power across multiple spots rather than concentrating it in a single beam. This parameter change reduces the power density at each spot, thereby reducing thermal interactions while maintaining or increasing overall productivity through parallel processing.
4Device complexity
If conventional single-beam irradiation is used, then device complexity is low, but build quality and surface properties deteriorate
Solution Approach 1:
The patent uses segmented laser diode arrays that can be integrated into existing additive manufacturing systems. While the device structure becomes more complex with multiple beam spots, the segmentation enables superior build quality through uniform power distribution and precise control over each irradiation location.
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 results in improved build quality, increased processing speeds, and the ability to produce objects with smaller features and better surface properties, while maintaining uniformity and dimensional tolerances.
Implementation Method 1
an energy beam generated by an irradiation device is directed onto a powder bed to melt and/or sinter sequential layers of powder material
Implementation Method 2
a first plurality of energy beams respectively from a first plurality of laser diodes in a first laser diode array and a second plurality of energy beams respectively from a second plurality of laser diodes in a second laser diode array
Data Source
AI summary
An irradiation device for additively manufacturing three-dimensional objects may include a beam generation device that includes a plurality of laser diode arrays. Respective ones of the plurality of laser diode arrays may include a plurality of diode emitters respectively configured to emit an energy beam. The plurality of laser diode arrays may be longitudinally offset relative to one another, and the plurality of laser diode arrays may be laterally offset relative to one another.