Radiative Heat-Break Extruder for Vacuum 3D Printing
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Solution Overview
Problem
Conventional additive manufacturing tools face challenges in managing heat transfer in low-pressure or low-gravity environments, such as in space, leading to feed material buckling and tool seizing due to ineffective passive or active cooling methods, especially with materials having high melting points.
Innovation Solution
An additive manufacturing tool incorporating a heat break and radiator system to passively reduce heat transfer from the heat block to the extruder assembly, using thermal radiation and a support structure to maintain tool stability and facilitate operation in extreme environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional passive or active cooling methods are used in low-pressure or low-gravity environments, then heat transfer from the heat block is reduced, but the cooling effectiveness deteriorates leading to feed material buckling and tool seizing
Solution Approach 1:
The patent replaces conventional mechanical cooling systems (fans, pumps, liquid cooling) with a passive radiative cooling system. The heat break and radiator assembly uses thermal radiation to dissipate heat from the heat block, eliminating the need for mechanical cooling components that fail in vacuum or microgravity environments. This substitution resolves the contradiction by providing reliable cooling without mechanical complexity.
Solution Approach 2:
The radiative cooling system operates autonomously without external power or active control. The radiator passively dissipates heat through thermal radiation to the surrounding environment, self-regulating the temperature of the heat block without requiring external cooling systems. This self-service mechanism ensures continuous operation in extreme environments where active cooling would fail.
2Reliability
If active cooling systems are used to manage heat transfer, then cooling effectiveness is improved, but device complexity increases and reliability decreases in vacuum or microgravity environments
Solution Approach 1:
The patent eliminates mechanical cooling components (motors, pumps, fans, liquid cooling circuits) by replacing them with a passive radiative cooling system. The heat break and radiator assembly uses only thermal radiation to dissipate heat, significantly reducing device complexity while maintaining or improving reliability in vacuum and microgravity environments where mechanical systems fail.
Solution Approach 2:
The patent extracts and removes the complex active cooling subsystems from the additive manufacturing tool, retaining only the essential passive radiative cooling components (heat break and radiator). This extraction simplifies the overall system while improving reliability by eliminating failure-prone mechanical cooling elements.
3Adaptability or versatility
If higher temperatures are used to process high melting point materials, then manufacturing capability is improved, but heat management becomes more difficult causing feed material buckling
Solution Approach 1:
The patent replaces active mechanical cooling with passive radiative cooling to manage heat from high-temperature processing of high melting point materials. The heat break and radiator assembly effectively dissipates excess heat through thermal radiation, enabling the use of higher processing temperatures without causing feed material buckling, thus improving manufacturing capability while preventing harmful thermal effects.
Solution Approach 2:
The patent changes the heat dissipation mechanism from convective/conductive (requiring mechanical systems) to radiative heat transfer. This parameter change in the cooling mechanism allows the system to operate at higher temperatures necessary for processing high melting point materials while effectively managing heat to prevent feed material buckling.
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 continuous operation at higher temperatures without active cooling, allowing the tool to function in low-gravity or vacuum conditions, such as in space, by reducing heat transfer and preventing feed material buckling.
Implementation Method 1
a radiator secured to at least one surface of the heat break
Implementation Method 2
transferring heat in at least one of a microgravity or low-pressure environment from the heat block to a heat break and a support structure
Data Source
AI summary
An apparatus for additively manufacturing an article includes a heat block, a nozzle in operable communication with the heat block and configured to receive a feed material, a heat break coupled to the heat block, at least a portion of the heat break extending into the heat block, and a radiator secured to at least one surface of the heat break. Related tools for additively manufacturing a material in a vacuum and related methods are also disclosed.