Powder Bed Energy Patterning for High-Throughput 3D Printing
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Solution Overview
Problem
Current powder bed fusion additive manufacturing machines are limited in part size, manufacturing cost, resolution of part details, and throughput due to challenges in scaling up laser power without increasing costs and degrading resolution.
Innovation Solution
The system employs two-dimensional energy patterning and energy beam reuse, utilizing beam shaping optics, energy patterning units, and image relays to efficiently direct and recycle energy, thereby improving material throughput and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser power is increased to scale up material throughput rate, then productivity is improved, but manufacturing cost increases proportionally
Solution Approach 1:
The laser beam is divided into multiple separate beams using beam splitting optics. Each beam independently processes a portion of the powder bed, enabling parallel processing that increases material throughput rate without requiring a single high-power laser, thus avoiding proportional cost increases.
Solution Approach 2:
The system transitions from sequential single-beam processing to parallel multi-beam processing by adding the spatial dimension of multiple simultaneous beams. This allows throughput scaling without linearly increasing laser power requirements and associated costs.
2Productivity
If laser spot size is increased to maintain optimum power flux at higher power levels, then productivity is improved, but manufacturing precision deteriorates
Solution Approach 1:
Instead of enlarging a single laser spot, the system segments the processing area into multiple smaller spots using multiple beams. Each beam maintains its original small spot size for high resolution, while collectively covering a larger area to achieve high throughput.
Solution Approach 2:
Multiple low-power beams are combined to achieve the effect of a single high-power beam while maintaining the resolution benefits of smaller spot sizes. The cumulative heating effect melts powder across the entire build area without sacrificing detail precision.
3Manufacturing precision
If multiple beams are used to maintain resolution at higher throughput, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
Beam splitting optics serve as an intermediary component that takes a single laser source and divides it into multiple beams. This intermediary approach enables multi-beam processing without requiring multiple independent laser systems, thereby limiting the increase in device complexity.
Solution Approach 2:
The single laser source performs multiple functions by generating multiple beams that process different areas simultaneously. This multi-functional approach achieves high throughput and precision without proportionally increasing the number of laser sources or associated control systems.
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 throughput of additive manufacturing, reduces material costs, and maintains high resolution, enabling the production of larger parts with improved efficiency and reduced operational expenses.
Implementation Method 1
uses one or more focused energy sources, such as a laser or electron beam, to draw a pattern in a thin layer of powder by melting the powder and bonding it to the layer below
Implementation Method 2
A preheat assembly may be used to preheat the material prior to bonding
Data Source
AI summary
An additive manufacturing system including a two-dimensional energy patterning system for imaging a powder bed is disclosed. Improved structure formation, part creation and manipulation, use of multiple additive manufacturing systems, and high throughput manufacturing methods suitable for automated or semi-automated factories are also disclosed.