Fiber Array Laser Beam Shaping for Parallel Metal Powder Melting
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Solution Overview
Problem
Existing laser additive manufacturing (LAM) systems lack active and adaptive control of laser beam spatiotemporal characteristics and in situ sensing techniques, leading to inefficiencies in productivity, repeatability, and quality of metal additive manufacturing products.
Innovation Solution
The implementation of a multi-beam fiber array laser system with adaptive multi-beam shaping and integrated sensing modules, allowing for real-time control and characterization of laser power distribution and material processing, enabling programmable feedforward and feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single laser beam is used for metal additive manufacturing, then the system is simpler to control, but productivity is limited due to sequential processing
Solution Approach 1:
The laser beam is segmented into multiple independent beamlets using a diffractive optical element. Each beamlet can be independently controlled to process different regions of the powder bed simultaneously, thereby increasing productivity without requiring multiple separate laser systems.
Solution Approach 2:
The system transitions from single-point sequential processing to multi-point parallel processing by spatially distributing the laser energy across multiple beamlets. This dimensional expansion in the processing space allows simultaneous melting of multiple powder regions, significantly improving manufacturing speed.
2Manufacturing precision
If laser beam parameters are fixed, then the system is easier to operate, but manufacturing precision and quality are compromised
Solution Approach 1:
The laser beam system is made dynamic by enabling independent modulation of each beamlet's parameters (power, position, duration) through electronic control. This allows adaptive adjustment of processing parameters for different regions and materials, improving manufacturing precision while maintaining ease of operation through automated control.
Solution Approach 2:
The system enables independent parameter changes for each beamlet including power level, focal position, pulse duration, and scanning speed. This granular parameter control allows optimization of laser energy deposition for different material types and geometric features, significantly improving manufacturing precision and quality.
3Reliability
If no in situ sensing is implemented, then the system is simpler, but repeatability and quality control are insufficient
Solution Approach 1:
In situ sensors are integrated into the laser processing system to provide real-time feedback on powder bed conditions, melt pool characteristics, and processed material properties. This feedback enables closed-loop control of laser parameters, ensuring process repeatability and consistent quality while automating the control complexity.
Solution Approach 2:
The system incorporates self-diagnostic and self-adjustment capabilities through integrated sensing. The system automatically monitors its own processing state and makes real-time parameter adjustments to maintain optimal conditions, improving reliability without requiring external intervention or complex manual control.
4Adaptability or versatility
If uniform laser power distribution is used, then the system is easier to control, but adaptability to different materials and features is limited
Solution Approach 1:
The laser system provides local quality control by enabling different power levels, focal positions, and processing parameters for each individual beamlet. This allows optimization of processing conditions for different materials, geometries, and defect types in different regions of the build volume, significantly improving adaptability and versatility.
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 productivity, repeatability, and quality of metal additive manufacturing by allowing precise control over laser energy deposition and material processing, improving the microstructure and mechanical properties of fabricated parts.
Implementation Method 1
a laser beam scanning element operable to selectively change the position of the fiber tip or the lens in at least two dimensions
Implementation Method 2
a lens positioned on an optical axis of the fiber tip
Implementation Method 3
heat the metal powder in a desired pattern so that it melts and then cools
Data Source
AI summary
A system that uses a scalable array of individually controllable laser beams that are generated by a fiber array system to process materials into an object. The adaptive control of individual beams may include beam power, focal spot width, centroid position, scanning orientation, amplitude and frequency, of individual beams. Laser beam micro scanner modules (MSMs) are arranged into 2D arrays or matrices. During operation of the MSMs, a fiber tip that projects the laser beam is displaced along the x and y-axis in order to scan the focal spot. Each MSM within a matrix can process a corresponding cell (e.g., one square centimeter) during focal spot scanning, and the plurality of MSMs may be operated in parallel to process a plurality of corresponding cells (e.g., with a 10×10 matrix of MSM, 100 cm2) without rastering or otherwise repositioning the assembly over the build surface.