Variable Voxel Deposition for Heat-Controlled Additive Manufacturing
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Solution Overview
Problem
Current additive manufacturing processes, such as Laser Powder Bed Fusion, Electron Beam Melting, and Selective Laser Sintering, face limitations including small build volumes, low deposition rates, high costs, and complex tool path generation, which hinder widespread adoption due to high equipment and material costs, as well as challenges in dynamic accuracy and surface finish.
Innovation Solution
A non-continuous deposition method that uses discrete increments of material deposited at specified locations within a build space, defined by a digital data model, allowing for modular scalability and improved heat management through voxel space subdivision, reducing excess material and residual stresses, and enabling efficient machining of final shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Laser Powder Bed Fusion, Electron Beam Melting, or Selective Laser Sintering are used, then manufacturing precision is improved, but build volume is limited and deposition rate is low
Solution Approach 1:
The build space is divided into a three-dimensional array of voxel spaces, allowing independent processing of discrete material deposits. This segmentation enables parallel deposition operations across multiple voxels, significantly increasing overall deposition rate while maintaining precision through individual voxel control.
Solution Approach 2:
The invention transitions from traditional layer-by-layer deposition to three-dimensional voxel-based deposition. By utilizing volumetric space rather than sequential layers, the system can deposit material at multiple Z-heights simultaneously, dramatically improving build volume utilization and deposition rate.
2Productivity
If high-power lasers and complex motion systems are used in DED, then deposition rate is improved, but equipment cost and operational complexity increase
Solution Approach 1:
The invention replaces complex mechanical motion systems with a stationary voxel array approach. Instead of moving the build platform or manipulating complex multi-axis robots, the system uses a fixed coordinate system with discrete voxel addresses, simplifying the mechanical infrastructure while maintaining high deposition rates through optimized material delivery.
Solution Approach 2:
The digital data model is used to create a virtual copy of the desired part geometry, which is then overlaid with the voxel array. This digital twin approach eliminates the need for complex physical toolpath generation and motion planning, reducing operational complexity while preserving deposition efficiency.
3Manufacturing precision
If fine powder is used in DED, then manufacturing precision is improved, but material cost increases and powder loss reaches 10-50%
Solution Approach 1:
The invention changes the material delivery parameter from continuous powder flow to discrete voxel-based deposition. By controlling material delivery at the voxel level, the system achieves precise material placement with minimal excess, reducing powder loss while maintaining manufacturing precision through digital model alignment.
Solution Approach 2:
The digital data model serves as a self-correcting guide for material deposition. The voxel array automatically identifies which voxels require material and in what quantities, eliminating the need for complex real-time monitoring and adjustment systems. This self-service approach ensures high material utilization efficiency while maintaining precision.
4Device complexity
If robotic systems are used in WAAM, then equipment cost is reduced, but dynamic accuracy and surface finish deteriorate
Solution Approach 1:
The invention introduces dynamic adaptability through variable voxel sizes. The system can adjust voxel dimensions based on local geometric requirements, allowing high resolution in critical areas and coarser resolution elsewhere. This dynamic adaptation compensates for robotic positioning limitations while maintaining overall part quality and reducing surface finish issues.
Solution Approach 2:
Different regions of the part are assigned different voxel sizes based on their specific requirements. Critical features use smaller voxels for higher precision, while non-critical areas use larger voxels to maintain deposition rate. This local quality approach allows the use of simpler robotic systems while achieving the required surface finish only where necessary.
5Productivity
If continuous extrusion is used, then deposition rate is improved, but heat management becomes difficult and residual stresses increase
Solution Approach 1:
The invention uses periodic, discrete material deposition at each voxel location rather than continuous extrusion. This pulsed deposition allows heat to dissipate between deposits, preventing excessive heat accumulation and reducing residual stresses while maintaining high overall deposition rates through rapid voxel-to-voxel transitions.
Solution Approach 2:
Continuous extrusion is segmented into discrete voxel-based deposits. By breaking the continuous material flow into separate, controlled deposits at each voxel, the system enables better heat management through spatial and temporal separation of deposition events, reducing thermal accumulation and associated defects.
6Ease of operation
If universal slicing software is developed, then ease of operation is improved, but tool path generation complexity increases
Solution Approach 1:
The voxel array approach serves multiple functions simultaneously: it defines the build space geometry, guides material deposition, controls deposition rates, and manages heat distribution. This multi-functionality eliminates the need for separate slicing and toolpath generation software, simplifying operation while reducing overall system complexity.
Data Source
AI summary
In the context of additive manufacturing processes wherein objects are built by layered accumulations of discrete instantaneous deposits of feedstock material at specific locations according to a three-dimensional digital data model, methods are provided for improving at least one build quality attribute by adjusting a size of one or more voxel spaces for receiving discrete deposits. According to various embodiments, the quality attribute pertains to reducing excess material used in the build process or to thermal behavior of deposited materials. According to various embodiments, the size of a voxel space may be adjusting by scaling and by subdividing into a cluster of smaller spaces that warrant smaller deposits.