Additive Manufacturing Nozzle Exchange for Leak-Free Continuous Printing
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Solution Overview
Problem
Existing additive manufacturing systems face inefficiencies due to nozzle wear, leakage issues from mismatched thermal expansion materials, and the need for frequent nozzle and crucible changes, leading to process interruptions and increased costs.
Innovation Solution
A system allowing for inline replacement of nozzle plates, crucibles, and actuators during the manufacturing process, using a clamping nut for secure attachment and a plastically deformable sealing material to prevent leakage, along with a crucible changer for seamless material transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nozzle plate is securely fastened to the crucible using a clamping nut, then leakage is prevented, but the nozzle plate cannot be easily replaced during the manufacturing process
Solution Approach 1:
The clamping nut is designed with a threaded connection that allows dynamic adjustment between tightening (for sealing) and loosening (for replacement). The threaded mechanism enables the operator to securely fasten the nozzle plate during operation and easily remove it when needed, transforming a static fastening system into a dynamic one that adapts to different operational states.
Solution Approach 2:
The fastening system is segmented into modular components: the clamping nut, the threaded connection, and the nozzle plate with integrated sealing element. This segmentation allows the nozzle plate to be independently removed and replaced while maintaining the sealing function through the integrated sealing ring, enabling maintenance without replacing the entire crucible assembly.
2Force
If a metallic clamping nut is used for fastening, then sufficient fastening force is achieved, but thermal expansion mismatch with ceramic components causes deformation and potential leakage
Solution Approach 1:
The sealing mechanism transitions from relying on rigid mechanical contact to utilizing plastic deformation of the sealing ring. The sealing ring is designed to deform plastically under the clamping force, creating a conformal seal that compensates for thermal expansion differences between the metallic nut and ceramic components, maintaining sealing effectiveness across temperature variations.
Solution Approach 2:
The fastening system employs a composite approach combining a metallic clamping nut for structural strength and fastening force with a polymer-based sealing ring for compliance and thermal expansion accommodation. This material combination allows the rigid metal component to provide necessary clamping force while the flexible polymer seal adapts to dimensional changes, preventing leakage despite thermal mismatch.
3Productivity
If the nozzle plate is replaced during the printing process, then continuous manufacturing is maintained, but the hot environment and pressurized melt increase the difficulty and risk of replacement
Solution Approach 1:
The nozzle plate is designed with an integrated sealing ring that remains attached to the nozzle plate during removal. This self-service design allows the plate to be quickly detached and replaced as a single unit, with the sealing element already in position, reducing the complexity and time of the replacement process while maintaining safety by minimizing exposure to hot melt.
Solution Approach 2:
The sealing ring is pre-installed and pre-positioned on the nozzle plate before the plate is removed from the crucible. This preliminary action ensures that when the plate is quickly replaced, the seal is already in place, reducing the time the system is open to the hot, pressurized environment and minimizing safety risks during the replacement operation.
4Reliability
If a plastically deformable sealing ring is used, then reliable sealing against molten metal is achieved, but the sealing material must withstand high temperatures and chemical corrosion
Solution Approach 1:
The sealing mechanism utilizes plastic deformation of the sealing ring under clamping force to create a permanent conformal seal. This deformation parameter change allows the sealing ring to adapt to surface irregularities and maintain contact pressure despite thermal expansion, achieving reliable sealing without requiring the material to remain perfectly elastic at high temperatures.
Solution Approach 2:
The sealing ring is designed as a consumable component that can be replaced with each nozzle plate change. This approach allows the use of materials optimized for sealing performance rather than extreme temperature resistance, as the seal is renewed regularly. The cost of the disposable sealing ring is much lower than the crucible or nozzle plate, making this economically viable.
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 manufacturing without interruptions, improves droplet quality, reduces downtime, and lowers costs by allowing for flexible material processing and efficient component changes.
Implementation Method 1
it was particularly recognized that plastic deformation of a heat-resistant sealing ring can prevent the melt from leaking at the nozzle plate
Implementation Method 2
Therefore, an elastic component is provided to ensure sufficient fastening force, for example, of the clamping nut to the ceramic guide sleeve
Data Source
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AI summary
The invention relates to a device (100) for additively manufacturing a component, which device allows the exchange of components undergoing wear and/or components which allow the use of various materials during an additive manufacturing process. For this purpose, a magazine (112) having a plurality of nozzles (110) is provided, which magazine allows a nozzle to be automatically replaced by another during a manufacturing process. In the process, using suitable actuators, either merely the nozzle (110) can be replaced or the container (108) which contains the liquid material and to which the nozzle (110) is attached can be substituted. If the container (108) is exchanged, the piston accommodated therein can be replaced at the same time.