Additive Manufacturing Module With Linked Powder Dosing for Small Builds
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Solution Overview
Problem
Existing additive manufacturing apparatuses, such as selective laser melting (SLM) and selective laser sintering (SLS), face challenges in reducing the build volume to minimize time and material usage, especially when manufacturing small or expensive parts like gold, as the conventional build volume is not efficiently adaptable.
Innovation Solution
A module is introduced that includes a frame with a secondary build chamber and dosing chamber, where the secondary build platform and dosing piston are mechanically linked to a drive mechanism, allowing for coordinated movement to reduce the build volume and optimize powder usage, featuring a gear mechanism and adjustable dosing head to account for powder spread inefficiencies and shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the build volume is reduced by inserting volume reducing elements into the master build chamber, then the build time and material usage are reduced, but the device complexity increases due to additional components and mechanisms
Solution Approach 1:
The module incorporates a secondary build chamber nested within the master build chamber, creating a compact hierarchical structure. The dosing chamber is integrated into the same module, with the dosing piston moving within the dosing chamber to dispense powder onto the secondary build platform. This nested arrangement reduces the overall footprint and eliminates the need for separate volume reduction mechanisms.
Solution Approach 2:
The module merges multiple functions into a single integrated unit: the frame defines both the secondary build chamber and dosing chamber, the secondary build platform combines support and dosing functions, and the mechanical linkage integrates the movement control of both platforms. This consolidation reduces device complexity compared to using separate volume reducing elements.
2Loss of substance
If the build volume is reduced to minimize powder material usage, then material cost is reduced, but powder dosing precision becomes more critical to ensure sufficient powder supply
Solution Approach 1:
The mechanical linkage between the secondary build platform and dosing piston creates an automatic feedback mechanism. As the secondary build platform moves down to accommodate layer solidification and shrinkage, the linkage automatically adjusts the dosing piston position to maintain proper powder bed level. This ensures consistent powder dosing precision even as the build progresses and material is consumed.
Solution Approach 2:
The dosing piston is positioned and adjusted before the build process begins, with the dosing head height可调 to account for expected powder spread inefficiencies and shrinkage. The mechanical linkage is pre-configured to provide the correct dosing compensation throughout the build, eliminating the need for real-time adjustments during manufacturing.
3Manufacturing precision
If a mechanical linkage is used to coordinate movement between secondary build platform and dosing piston, then powder dosing accuracy is improved, but the device complexity increases due to additional mechanical components
Solution Approach 1:
The mechanical linkage operates autonomously based on the movement of the secondary build platform. As the platform moves down during the build process, the linkage automatically adjusts the dosing piston position without requiring external control signals or additional actuators. The system self-regulates the dosing mechanism based on its own operational state, reducing control system complexity.
Solution Approach 2:
The mechanical linkage acts as an intermediary mechanism that translates the movement of the secondary build platform into corresponding adjustments of the dosing piston. This simple mechanical mediation provides precise coordination between the two moving components without requiring complex electronic control systems or feedback loops.
4Quantity of substance
If the dosing chamber cross-sectional area is increased to account for powder spread inefficiencies, then powder supply sufficiency is improved, but the module size and device complexity increase
Solution Approach 1:
The dosing chamber is designed with a cross-sectional area specifically optimized for powder storage and dosing, which may differ from the secondary build chamber area. The dosing head is positioned to deliver powder precisely where needed, with the dosing chamber dimensions tailored to provide sufficient powder quantity while maintaining a compact overall module size. This localized optimization ensures powder supply sufficiency without unnecessarily increasing the entire module volume.
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 solution enables a reduced build volume, efficient powder dosing, and reduced material usage, allowing for faster production of small parts like dental components or jewelry by ensuring sufficient powder is supplied while minimizing waste and accommodating shrinkage, thus optimizing the additive manufacturing process.
Implementation Method 1
a dosing piston movable in the dosing chamber to push powder from the dosing chamber
Implementation Method 2
A laser beam is then scanned across areas of the powder layer that correspond to a cross-section of the object being constructed. The laser beam melts or sinters the powder to form a solidified layer.
Implementation Method 3
The laser beam melts or sinters the powder to form a solidified layer
Implementation Method 4
The laser beam melts or sinters the powder to form a solidified layer
Data Source
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AI summary
This invention concerns a module for insertion into an additive manufacturing apparatus. The module comprising a frame (201) mountable in a fixed position in the additive manufacturing apparatus, the frame (201) defining a build chamber (205) and a dosing chamber (206). A build platform (207) is movable in the build chamber (205) for supporting a powder bed during additive manufacturing of a part. A dosing piston (210) is movable in the dosing chamber (206) to push powder from the dosing chamber (206). A mechanism (219a, 219b, 220) mechanically links the build platform (205) to the dosing piston (210) such that downward movement of the build platform (207) in the build chamber (205) results in upward movement of the dosing piston (210) in the dosing chamber (206).