Fixed Build Plate Powder Bed Layout for Large-Scale Layer Precision
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Solution Overview
Problem
Conventional additive manufacturing systems face challenges in precisely controlling large build volumes due to the increased mass of printed parts, leading to inaccuracies in layer thickness and mechanical properties, and struggle with automated leveling and heating of the build plate, especially in larger machines.
Innovation Solution
Implementing a fixed build plate with a vertically displaceable shroud and powder deposition system, combined with a support column heating system for thermal expansion to maintain leveling and temperature control, allowing for precise control of layer thickness and mechanical properties across large build volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the build plate is made movable to enable indexing between layers, then layer-by-layer manufacturing is enabled, but control precision deteriorates due to the increased mass of large build volumes
Solution Approach 1:
Instead of moving the build plate downward between layers, the patent inverts the approach by keeping the build plate fixed and moving the powder bed upward. This inversion resolves the control precision issue by eliminating the need to accurately position and control the movement of the heavy build plate, while still enabling layer-by-layer manufacturing through the upward movement of the powder deposition system.
Solution Approach 2:
The patent segments the build system into a fixed build plate and a movable powder bed assembly. This segmentation allows the heavy build plate to remain stationary for stability and precision, while the powder bed and deposition system are made movable to enable layer-by-layer manufacturing. The shroud is also segmented to move with the powder bed, creating distinct functional zones.
2Adaptability or versatility
If the build plate size is increased to accommodate large parts, then manufacturing versatility is improved, but automated leveling becomes more difficult
Solution Approach 1:
The patent inverts the traditional approach by making the powder bed movable rather than the build plate. This allows the build plate to remain fixed and level throughout the manufacturing process, eliminating the need for automated leveling systems. The movable powder bed adapts to the fixed build plate, enabling large part manufacturing without compromising leveling ease.
Solution Approach 2:
The system employs sensors and feedback mechanisms that automatically detect and compensate for any deviations in the build plate surface, enabling self-leveling without manual intervention. This self-service approach maintains ease of operation while accommodating large build volumes.
3Adaptability or versatility
If the build plate size is increased to accommodate large parts, then manufacturing versatility is improved, but temperature control precision deteriorates
Solution Approach 1:
The patent segments the thermal management system into multiple independent heating zones distributed across the build plate and support columns. Each zone can be independently controlled to maintain precise temperature distribution across large build volumes. This segmentation allows different regions to be heated or maintained at different temperatures as needed.
Solution Approach 2:
The system dynamically adjusts temperature parameters across different zones of the build plate and support columns based on real-time feedback from temperature sensors. This parameter control enables precise temperature management across large build volumes, compensating for heat loss and maintaining optimal processing conditions throughout the build volume.
4Manufacturing precision
If a fixed build plate is used to improve control precision, then layer thickness accuracy is improved, but the ability to index between layers is lost
Solution Approach 1:
The patent applies the inversion principle by keeping the build plate fixed and moving the powder bed upward between layers. This maintains the precision benefits of a fixed build plate while restoring layer indexing capability through the movement of the powder deposition system and shroud, effectively resolving the contradiction.
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 accurate and precise control of layer thickness and mechanical properties, facilitates automated leveling, and maintains the build plate's flatness and temperature, improving the robustness and quality of the manufactured parts, even in large-scale additive manufacturing.
Implementation Method 1
A heater is attached to the support column and configured to heat a portion of the support column
Implementation Method 2
an optics assembly configured to direct laser energy from one or more laser energy sources towards the build volume. Exposure of the powder layer to the laser energy melts at least a portion of the powder layer
Data Source
AI summary
Disclosed embodiments relate to additive manufacturing systems. In some embodiments, an additive manufacturing system includes a fixed build plate, and a build volume extends above the fixed build plate. A boundary of the build volume may be defined by a powder containing shroud that is vertically displaceable relative to the fixed build plate. A powder deposition system is configured to deposit a powder layer along an upper surface of the build volume and the powder deposition is vertically displaceable relative to the fixed build plate. An optics assembly configured to direct laser energy from one or more laser energy sources towards the build volume, and exposure of the powder layer to the laser energy melts at least a portion of the powder layer. In some embodiments, the build plate may be supported by support columns configured to maintain the build plate in a level orientation throughout a build process.