Molten Metal Cartridge Dispensing for In-Space Additive Manufacturing
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Solution Overview
Problem
Existing methods of manufacturing large structures in space are limited by weight constraints of launch vehicles, requiring small modular parts that increase manufacturing and shipping costs and restrict structure size.
Innovation Solution
A molten metal dispensing system with a cartridge, heater, actuator, and filter is used to deposit molten metal in layers on a substrate, allowing large structures to be constructed directly in space without weight constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If small sized modular parts are used to meet weight constraints, then launch weight constraints are satisfied, but structure size is limited and manufacturing costs increase
Solution Approach 1:
The system segments the manufacturing process into modular components (cartridge, heater, actuator, filter) that can be launched separately and assembled in space, while the metal bar feedstock is supplied in manageable sections. This allows the manufacturing system itself to be modular yet capable of producing large continuous structures.
Solution Approach 2:
The invention transitions from Earth-based manufacturing constraints to in-space manufacturing, adding the dimension of orbital assembly. Structures are built in three-dimensional space around orbital platforms, eliminating terrestrial weight and size constraints while allowing modular launch components to be assembled into large-scale structures.
2Weight of moving object
If small sized modular parts are used, then launch weight constraints are satisfied, but manufacturing and shipping costs increase
Solution Approach 1:
The system incorporates an actuator that automatically feeds metal bars through the cartridge and heater assembly, and a filter that automatically removes impurities from the molten metal. This self-service capability eliminates the need for manual intervention during the additive manufacturing process in space, reducing operational complexity and cost.
Solution Approach 2:
The system changes the physical state of metal from solid bar to molten state through controlled heating, enabling additive manufacturing. By controlling temperature parameters and metal flow rates, the system optimizes the manufacturing process to reduce energy consumption and material waste, thereby lowering overall manufacturing costs.
3Volume of moving object
If molten metal is dispensed in space, then large structures can be manufactured without weight constraints, but surface tension of molten metal must be overcome
Solution Approach 1:
The filter serves as an intermediary element between the molten metal and the deposition surface. It not only removes impurities but also acts as a flow control mechanism that helps overcome surface tension effects, enabling smooth, uniform metal flow onto the substrate in the microgravity environment of space.
Solution Approach 2:
The filter is designed with porous structure that allows controlled passage of molten metal while maintaining flow stability. The porous material properties help regulate metal flow rate and break surface tension, enabling consistent deposition of molten metal layers in the weightless environment without forming droplets or irregular flows.
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
Enables large-scale additive manufacturing of structures like space habitats by eliminating launch constraints, reducing defects due to vacuum conditions, and providing high-rate manufacturing capabilities.
Implementation Method 1
a heater configured to melt a portion of the metal bar at the first end of the cartridge
Implementation Method 2
an actuator configured to apply a force to the metal bar to move the metal bar towards the first end of the cartridge
Implementation Method 3
the filter is configured to break down a surface tension of the molten metal to dispense a substantially uniform layer of the molten metal on a substrate
Data Source
AI summary
Molten metal dispensing systems and techniques for additive manufacturing in space are provided. In one aspect, a molten metal dispensing system includes a cartridge including a channel extending from a first end of the cartridge to a second end of the cartridge, the channel configured to receive a metal bar at the second end of the cartridge. The system also includes a filter positioned adjacent to the first end of the cartridge, a heater configured to melt a portion of the metal bar at the first end of the cartridge, an actuator configured to apply a force to the metal bar to move the metal bar towards the first end of the cartridge. The movement of the metal bar pushes the melted portion of the metal bar through the filter to dispense the melted portion of the metal bar.