Additive Manufacturing Mobile Scan Area Gas Plume Control
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Solution Overview
Problem
Conventional additive manufacturing systems face challenges in scaling up to larger formats, leading to issues with uniform layer-wise powder distribution, effective gas plume management, and control of laser energy density, resulting in defects and inferior surface finishes on large parts.
Innovation Solution
A large format additive manufacturing apparatus with a build unit that includes a powder dispenser, recoater blade, and irradiation emission directing device, capable of moving in three dimensions and rotating in the x-y plane, along with a laminar gasflow zone for efficient gas management, and a selective recoater with multiple gates for precise powder control, allowing for independent movement of the build unit and laser source to maintain consistent energy density and minimize defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional additive manufacturing systems are scaled up to larger formats, then the build area and object size are increased, but uniform layer-wise powder distribution deteriorates and defects increase
Solution Approach 1:
The system segments the large build area into multiple smaller scan areas that can be independently processed. The laser source processes one scan area at a time while the build unit moves to position the next scan area, maintaining consistent processing quality across the entire large build area without compromising powder distribution uniformity.
Solution Approach 2:
The system dynamically coordinates the movement of the build unit in three dimensions with the laser scanning process. The build unit moves to reposition scan areas while the laser processes material, creating a dynamic workflow that maintains processing precision across large formats. The independent movement of the build unit and laser source allows continuous operation without sacrificing quality.
2Area of stationary object
If the build area is increased in conventional systems, then larger objects can be manufactured, but gas plume management becomes ineffective and surface finish deteriorates
Solution Approach 1:
The large build area is divided into multiple smaller scan areas, each processed sequentially by the laser. This segmentation allows the gasflow device to effectively manage plume removal within each smaller scan area, preventing gas plume accumulation and interference that would occur in a single large unsegmented area, thereby maintaining good surface finish quality.
3Area of stationary object
If the scan area is stationary and large in conventional systems, then coverage is increased, but laser energy density control deteriorates and defects increase
Solution Approach 1:
The system employs dynamic coordination between the moving build unit and the laser source. The build unit moves independently in three dimensions to reposition scan areas while the laser maintains consistent energy density within each scan area. This dynamic approach allows large overall coverage while preserving laser energy density consistency, as the laser processes smaller areas with controlled energy density rather than attempting to cover large areas in a single stationary scan.
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
Enables the production of high-precision, large-scale additively manufactured objects with improved surface finish and reduced defects by maintaining consistent energy density and efficient gas flow, overcoming limitations of traditional systems in scaling and powder distribution.
Implementation Method 1
irradiating at least part of the first layer of powder within the first build area to form a first fused layer
Implementation Method 2
irradiation emission directing device that directs an energy beam, for example, an electron beam or a laser beam, to sinter or melt a powder material
Implementation Method 3
a laminar gasflow zone for efficient gas management
Implementation Method 4
allowing for independent movement of the build unit and laser source to maintain consistent energy density
Implementation Method 5
a selective recoater with multiple gates for precise powder control
Data Source
AI summary
The present disclosure generally relates to additive manufacturing systems and methods on a large-scale format. One aspect involves a build unit that can be moved around in three dimensions by a positioning system, building separate portions of a large object. The build unit has an energy directing device that directs, e.g., laser or e-beam irradiation onto a powder layer. In the case of laser irradiation, the build volume may have a gasflow device that provides laminar gas flow to a laminar flow zone above the layer of powder. This allows for efficient removal of the smoke, condensates, and other impurities produced by irradiating the powder (the “gas plume”) without excessively disturbing the powder layer. The build unit may also have a recoater that allows it to selectively deposit particular quantities of powder in specific locations over a work surface to build large, high quality, high precision objects.