Multi-Beam 3D Printing Seam Offset for Stable Layer Fusion
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Solution Overview
Problem
Three-dimensional printing systems using multiple energy beams face challenges in transitioning between energy beams, affecting the internal structural integrity of fabricated articles due to alignment uncertainties and seam inconsistencies between fused layers.
Innovation Solution
A system and method that utilize a controller to operate multiple energy beams to create a sequence of selectively fused layers with overlapping hatch areas, where the transverse overlap distance is based on alignment uncertainty, ensuring a minimum offset between seams, thereby improving structural integrity by varying the lateral location of seams layer by layer and maintaining a consistent seam zone width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple energy beams are used to increase productivity, then manufacturing efficiency is improved, but alignment uncertainties and seam inconsistencies between fused layers worsen
Solution Approach 1:
The patent implements dynamic seam location variation where the transverse position of seams changes from layer to layer within a controlled zone. This dynamic adjustment prevents cumulative alignment errors and distributes potential misalignment effects across multiple locations rather than concentrating them at a fixed seam position, thereby maintaining manufacturing precision while using multiple energy beams for high productivity
Solution Approach 2:
The patent changes the parameter of seam transverse position across layers, creating a varied seam pattern where no two layers have seams at the same location within the overlap zone. This parameter variation compensates for alignment uncertainties by ensuring that any single misalignment event affects only a limited portion of the overall structure, preserving manufacturing precision while enabling multi-beam high-speed fabrication
2Productivity
If multiple energy beams are used to increase productivity, then manufacturing efficiency is improved, but seam inconsistencies between fused layers worsen
Solution Approach 1:
The patent introduces dynamic variation in seam locations across layers, where the transverse position of each seam is deliberately changed relative to previous layers. This dynamic approach prevents repeated stress concentrations at the same location and distributes potential inconsistencies throughout the structure, maintaining compositional stability despite using multiple energy beams that may exhibit varying performance characteristics
Solution Approach 2:
The patent establishes predetermined constraints on seam positioning, including minimum offset distances and controlled overlap zones, before the actual fusion process begins. These preliminary positional constraints ensure that even with multiple energy beams causing potential inconsistencies, the seam locations are pre-planned to avoid cumulative defects and maintain structural composition stability
3Strength
If overlapping hatch areas are created with transverse overlap distance based on alignment uncertainty, then structural integrity is improved, but device complexity increases
Solution Approach 1:
The patent defines the transverse overlap distance as a specific parameter derived from alignment uncertainty characteristics. By establishing this parameter relationship, the patent ensures sufficient overlap between hatch areas to maintain structural integrity at seams while managing the complexity through systematic parameter definition rather than ad-hoc adjustments
Solution Approach 2:
The patent accepts and accommodates alignment uncertainties by designing the overlap zone to be sufficient to cover potential misalignment variations. Rather than investing in extremely complex alignment systems, the solution uses a more straightforward approach of ensuring adequate overlap distance that can absorb typical alignment variations, trading some redundant material for simpler 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
Enhances the internal structural integrity of 3D articles by ensuring consistent and stable fusion patterns across layers, addressing alignment uncertainties and seam inconsistencies, resulting in improved mechanical properties and manufacturing efficiency.
Implementation Method 1
Each layer of powdered material is selectively fused using an energy beam such as a laser, electron, or particle beam
Implementation Method 2
Each layer of powdered material is selectively fused using an energy beam such as a laser
Implementation Method 3
The first and second hatch areas overlap along a seam with a transverse overlap distance (x)
Data Source
Figure 1~2
Figure 3A~3D
Figure 4~5
AI summary
A system (2) for fabricating a three-dimensional article (4) includes a powder dispenser (14) and a fusing apparatus (16). The fusing apparatus (16) is configured to generate and scan a plurality of beams (18) across a build plane (19) including a first beam and a second beam. The controller (20) is configured to operate the powder dispenser (14) and the fusing apparatus (16) to form a sequence of at least three fused layers. The layers individually include a first hatch area (26) defined by the first energy beam and a second hatch area (28) defined by the second energy beam. The first and second hatch areas overlap along a seam (30) with a transverse overlap distance (x). A lateral location of the seam varies layer by layer. No two layers in the sequence have a transverse distance between seams of less than u. The distance u is at least equal to twice the transverse overlap distance (x).