Large-Area Pulsed Laser Melting for Faster Metal Powder Bed Fusion
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Solution Overview
Problem
Current metal additive manufacturing (AM) processes, particularly laser powder bed fusion (LPBF), are limited by slow build speeds due to the serial nature of material melting and solidification, which hinders high-volume manufacturing and increases production costs.
Innovation Solution
A system utilizing a first light source for preheating and a second light source with a shorter, more intense pulse to simultaneously melt large areas of metal powder and substrate, optimizing powder size and layer thickness for improved molten material flow and surface smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional LPBF uses a single laser source melting powder serially, then manufacturing precision is maintained, but productivity is limited due to slow build speed
Solution Approach 1:
The patent divides the melting process into two distinct temporal stages: a first longer-duration pulse for preheating the substrate, and a second shorter-duration pulse for complete melting of powder and substrate. This segmentation allows each pulse to be optimized for its specific function, enabling faster overall processing while maintaining quality
Solution Approach 2:
The first light pulse performs preliminary heating of the substrate before the second pulse arrives. By preheating the substrate in advance, the second pulse can complete melting more quickly and efficiently, reducing total manufacturing time while maintaining manufacturing precision
2Productivity
If multiple laser sources are used to increase build speed, then productivity improves, but device complexity increases due to alignment and synchronization challenges
Solution Approach 1:
The patent makes a single laser source perform multiple functions by emitting pulses of different durations at different times. The same laser source handles both preheating (first pulse) and complete melting (second pulse), eliminating the need for multiple laser sources and their associated alignment and synchronization systems
3Manufacturing precision
If longer laser pulse duration is used to melt thick powder layers, then manufacturing precision is maintained, but productivity decreases due to slower processing
Solution Approach 1:
The patent segments the heating process into two pulses: a first longer pulse that provides gentle preheating to avoid defects, and a second shorter pulse that delivers intense energy for rapid complete melting. This segmentation achieves both surface smoothness (through controlled preheating) and fast processing (through intense short-duration melting)
Solution Approach 2:
The patent changes the temporal parameter (pulse duration) between the two light pulses. The first pulse uses a longer duration for controlled heating, while the second pulse uses a shorter duration for rapid melting. This parameter change enables the system to achieve both manufacturing precision and high productivity
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 significantly increases build speed and achieves high-density, smooth surfaces in 3D parts, overcoming the limitations of traditional LPBF by enabling parallel processing and reducing defects, thus enhancing manufacturing efficiency and cost-effectiveness.
Implementation Method 1
a first light source for generating a first light pulse of a first duration, the first light pulse operating to preheat a substrate underneath a new layer of powder particles
Implementation Method 2
a second light source for generating a second light pulse subsequent to the generation of the first light pulse. The second light pulse has a duration shorter than the first duration by a factor of at least about 10, and fully melts the new layer of powder particles in addition to the substrate
Data Source
AI summary
The present disclosure relates to systems and methods for performing large area laser powder bed fusion (LBPF) to form a plurality of layers of a 3D part in a layer-by-layer fashion using meltable powder particles. In one implementation the system makes use of a first light source, which may be a diode laser subsystem, for generating a first light pulse of a first duration. The first light is used to preheat a substrate underneath a new layer of powder particles, wherein the substrate is formed from a previously fused quantity of the powder particles. A second light source, which may be a pulse laser, generates a second light pulse subsequent to the first light pulse. The second light pulse has a second duration shorter than the first duration by a factor of at least about 10, and fully melts the new layer of powder particles in addition to the substrate, to achieve a smooth printed layer. The wavelength of the first light pulse also differs from a wavelength of the second light pulse.