Molten Metal Droplet Ejection With an Insulating Piston
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Solution Overview
Problem
Existing additive manufacturing systems face issues such as high maintenance costs due to transducer damage from molten metal heat, require high-temperature compliant transducers or cooling systems, and are limited to separate metal and polymer printing, lacking the ability to combine metal and polymer for multi-dimensional printing.
Innovation Solution
A system with a thermally and electrically insulating piston made of materials like borosilicate glass, coupled with a transducer to eject molten metal droplets, and a polymer extruder for combined metal-polymer printing, controlled by a CNC bed and control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal piston is used to push molten metal, then the piston can effectively eject metal droplets, but the transducer gets damaged due to heat transfer from molten metal
Solution Approach 1:
A thermally insulating piston made of ceramic or insulated material is introduced as an intermediary between the transducer and molten metal. This piston acts as a thermal barrier that prevents heat transfer to the transducer while still allowing effective metal ejection, thus resolving the contradiction between transducer protection and metal ejection capability
Solution Approach 2:
The traditional metal piston mechanism is replaced with a ceramic or insulated piston system that maintains mechanical functionality while providing thermal isolation. This substitution allows the use of standard low-temperature transducers instead of requiring high-temperature compliant transducers or dedicated cooling systems
2Reliability
If high-temperature compliant transducers or dedicated cooling systems are used to protect the transducer, then the transducer is protected from heat damage, but the overall cost of the additive manufacturing system increases
Solution Approach 1:
The thermally insulating piston serves as a simple intermediary component that provides transducer protection without requiring complex cooling systems or expensive high-temperature compliant transducers. This single component solution reduces overall system complexity and cost while maintaining transducer reliability
Solution Approach 2:
The insulated piston acts as a sacrificial thermal barrier that can be easily replaced if worn, rather than requiring expensive, complex, or specialized transducers. This approach uses a simpler, more economical component to protect the valuable transducer from heat damage
3Adaptability or versatility
If separate metal printers and polymer printers are used, then each machine can be optimized for its specific material, but the inability to print metal and polymer together limits manufacturing versatility
Solution Approach 1:
The thermally insulating piston system enables a single additive manufacturing machine to handle both metal and polymer materials by providing thermal isolation that allows polymer printing alongside metal droplet ejection. This universal solution eliminates the need for separate specialized printers, thereby increasing manufacturing versatility
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
Reduces transducer damage and heat loss, enabling cost-effective, low-maintenance additive manufacturing capable of multi-dimensional metal-polymer printing, including electronic circuits.
Implementation Method 1
An induction heater configured around the reservoir to melt the metal inside the reservoir
Implementation Method 2
The piston is made of thermally insulating and electrically insulating material
Implementation Method 3
a magnetostrictive or piezoelectric transducer
Implementation Method 4
a magnetostrictive or piezoelectric transducer
Data Source
AI summary
The present disclosure relates to a system for additive manufacturing. The system includes a frame, a CNC bed configured with the frame. A metal dispensing mechanism configured to eject metal droplets on the CNC bed. The metal dispensing mechanism is configured to controllably move with respect to the CNC bed for manufacturing the object. The metal dispensing mechanism includes a first nozzle, functionally configured with the CNC bed, for controllably dispensing the metal droplets on the CNC bed, and the nozzle is fluidically configured with a reservoir having the metal. A piston configured with the reservoir, and the piston is configured to push the molten metal from the reservoir such the molten metal is released from the reservoir towards the first nozzle. The piston is made of thermally insulating material, and a transducer configured with the piston to facilitate mechanical jerking of the piston for facilitating the pushing of the molten metal from the reservoir.