Lateral Melt Transfer in Powder Bed AM for Non-Uniform Build Layers
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Solution Overview
Problem
Existing additive manufacturing systems, such as DMLM, face challenges with non-uniform deposition of particulate material, which can lead to inefficiencies and increased costs in producing components with complex geometries, as they often require uniform and non-uniform material distribution for containment and feature creation.
Innovation Solution
An additive manufacturing system that utilizes a consolidation device to create a surface tension gradient by repetitive laser re-melting, transferring molten material from a first region to a second region within a build layer, allowing for lateral material transfer and correction of non-uniformities in situ, enabling the production of complex components with reduced material and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a recoat device is used to deposit particulate material uniformly, then manufacturing efficiency is improved, but the ability to create non-uniform features (such as containment walls) is compromised
Solution Approach 1:
The system applies different deposition qualities to different regions of the build layer. The recoat device provides uniform deposition for general areas, while the consolidation device creates non-uniform deposition (containment walls) in specific regions where material transfer occurs, allowing both uniform and non-uniform features to coexist in the same build layer
2Manufacturing precision
If lateral material transfer is implemented to correct non-uniformities, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The consolidation device merges multiple functions into a single system: it consolidates particulate material, creates molten volumes, enables lateral material transfer, and corrects non-uniformities. This integration achieves high manufacturing precision without requiring separate devices for each function, thereby limiting the increase in device complexity
3Manufacturing precision
If repetitive laser re-melting is used to create surface tension gradient, then material transfer precision is improved, but energy consumption increases
Solution Approach 1:
The laser applies periodic re-melting actions to specific regions rather than continuous melting. This periodic application creates the necessary surface tension gradients for material transfer while minimizing total energy consumption by only heating areas where material transfer is needed, rather than the entire build layer
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 enables the creation of complex components with reduced material and energy usage, correcting errors in real-time and lowering manufacturing costs by ensuring precise distribution of particulate material, thus enhancing the efficiency and quality of the additive manufacturing process.
Implementation Method 1
The consolidation device is configured to melt a portion of the particles to form a molten volume of transfer material
Implementation Method 2
The consolidation device is configured to transfer a portion of the molten volume of transfer material from the first region to the second region
Data Source
AI summary
An additive manufacturing system includes a build platform, a plurality of particles positioned on the build platform defining a build layer, a first and second region within the build layer, and at least one consolidation device. The first region and the second region each including a portion of the plurality of particles. The at least one consolidation device is configured to consolidate the plurality of particles within the build layer into a solid, consolidated portion of said build layer. The consolidation device is further configured to consolidate at least one of the plurality of particles within the build layer and the solid, consolidated portion of the build layer into a molten volume of transfer material. The consolidation device is further configured to transfer a portion of the molten volume of transfer material within the first region from the first region to the second region.