Movable Inert Gas Purging System for Additive Manufacturing
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Solution Overview
Problem
Existing additive manufacturing systems face challenges in effectively reducing impurities introduced during each layer of the sintering process, which can lead to errors in the melt pool and prevent proper sintering.
Innovation Solution
The implementation of a chamber-purging system with an extendable supply channel and return channel, positioned to create a laminar flow of inert gas over the active build region, effectively captures and removes contaminants such as smoke and other byproducts from the build chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a typical additive manufacturing system purges the build chamber after sintering each layer, then the amount of contaminants within the build chamber is reduced, but the purging ability is insufficient to effectively reduce impurities introduced during each layer
Solution Approach 1:
The purging system uses movable components including a movable supply channel and movable return channel that can extend and retract. The supply channel includes a supply nozzle that can move to different positions, and the return channel includes a return nozzle that can move to different positions. This dynamic positioning allows the purging system to adapt to different build stages and effectively capture contaminants at their source during the sintering process, significantly improving purging effectiveness compared to static purging systems.
Solution Approach 2:
The purging system utilizes gas flow dynamics by introducing purge gas through the movable supply channel and capturing contaminants through the movable return channel. The system creates controlled gas flow patterns that sweep contaminants away from the build region during sintering. The pneumatic design allows for adjustable flow rates and flow directions to optimize contaminant removal effectiveness throughout the build process.
2Reliability
If the chamber-purging system is positioned within the travel path, then the purging ability is improved, but the recoater arm cannot move freely
Solution Approach 1:
The purging system components are designed to be movable rather than fixed. The supply channel can move to position the supply nozzle within the travel path during sintering to maximize purging effectiveness. The return channel can move to position the return nozzle optimally for contaminant capture. After sintering, these components can retract or move to different positions to clear the travel path for the recoater arm, eliminating interference with powder spreading operations.
Solution Approach 2:
The purging system operates in periodic cycles coordinated with the sintering and recoating processes. During sintering, the supply and return channels extend to their active positions within the travel path to maximize purging ability. Between sintering operations, during the recoating phase, the channels retract or move to positions that do not interfere with the recoater arm movement. This periodic positioning allows both high purging effectiveness during sintering and uninterrupted recoater operation during powder spreading.
3Object-affected harmful factors
If inert gas is used to purge the build chamber, then contaminants are reduced, but the system complexity increases
Solution Approach 1:
The movable supply channel and movable return channel serve multiple functions. The supply channel not only introduces purge gas but can be positioned to different locations to address contaminants at various stages of the build process. The return channel not only captures contaminants but can be repositioned to optimize capture locations. This multi-functionality reduces the need for separate dedicated components for each purging task, thereby managing system complexity while maintaining effective contaminant removal.
Solution Approach 2:
The system uses inert gas (such as nitrogen or argon) to create an inert atmosphere in the build chamber during sintering. This inert atmosphere prevents oxidation of the molten metal and reduces the formation of harmful contaminants. The inert gas flow is controlled through the movable supply and return channels, creating a protective atmosphere that maintains material quality while the movable components manage the gas distribution efficiently.
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 enhances the purging ability of the additive manufacturing system, significantly reducing the number of contaminants in the build chamber, which in turn improves the quality of the sintered layers and reduces errors in the build object.
Implementation Method 1
positioned to create a laminar flow of inert gas over the active build region
Implementation Method 2
fluidly coupled to a suction component to remove gas from the build chamber
Data Source
AI summary
Additive manufacturing systems and associated methods are disclosed herein. In some embodiments, the additive manufacturing system includes a build chamber that has active build region, a support platform positioned in the active build region, a recoater arm, and a chamber-purging system. The recoater arm is movable in a lateral direction along a travel path above the active build region to spread a powder over the active build region. The chamber-purging system includes extendable input and return channels that are movable between a first position outside the travel path and a second position at least partially within the travel path.