Electrohydrodynamic Additive Manufacturing for Metallic Salts
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Solution Overview
Problem
Conventional additive manufacturing systems face challenges in precisely and quickly depositing metallic salts, which are candidates for soluble support materials, due to their high temperature and corrosive nature, limiting their use in layer-based 3D part formation.
Innovation Solution
The implementation of an electrohydrodynamic (EHD) printing process using a melt pool and an array of hollow electrically conductive nozzles, where voltage modulation creates electrostatic distortions to eject droplets of molten consumable material, allowing for precise and high-resolution deposition of metallic salts as support structures and part material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional additive manufacturing systems are used to deposit metallic salts, then the process is simple and equipment is readily available, but the precision and speed of deposition are insufficient
Solution Approach 1:
The patent replaces conventional mechanical deposition systems with an electrohydrodynamic (EHD) printing system that uses electric fields to control material ejection. The EHD printer uses a melt pool, array of hollow electrically conductive nozzles, grid, and drivers to create electrostatic distortions that precisely eject droplets of molten consumable material, achieving high deposition precision without relying on conventional mechanical positioning and dispensing mechanisms
Solution Approach 2:
The patent changes the physical state and electrical parameters of the metallic salt material by melting it to high temperature and applying controlled voltage potentials through the nozzle array. The drivers modulate the voltage of individual nozzles relative to ground potential, creating electrostatic forces that control droplet ejection timing, size, and position, thereby achieving precise deposition of corrosive metallic salts
2Productivity
If conventional additive manufacturing systems are used to deposit metallic salts, then the equipment is simple, but the deposition speed is slow
Solution Approach 1:
The patent replaces slow mechanical dispensing with rapid electrohydrodynamic ejection. The EHD system uses electric field-induced electrostatic distortions to quickly eject droplets from the melt pool through the nozzle array, significantly increasing deposition speed compared to conventional mechanical systems while managing the complexity through integrated electrical control
Solution Approach 2:
The patent prepares the metallic salt material in advance by melting it in the melt pool to a high temperature and maintaining it in a molten, electrically conductive state. This preliminary action ensures the material is ready for rapid ejection whenever voltage is applied to the nozzles, enabling high-speed deposition without repeated heating cycles
3Manufacturing precision
If metallic salts are used as support material, then the material has good strength and solubility, but the high temperature and corrosive nature make precise deposition difficult
Solution Approach 1:
The patent replaces mechanical contact-based deposition with non-contact electrohydrodynamic ejection. The high voltage electric fields create electrostatic forces that precisely control droplet formation and trajectory without mechanical contact, allowing precise placement of hot, corrosive metallic salt droplets that would damage conventional mechanical components
Solution Approach 2:
The patent uses the electric field as an intermediary to transfer and control the molten metallic salt material. The electric field acts as a mediator that can precisely manipulate the corrosive, high-temperature material through electrostatic forces without requiring direct mechanical interaction, thereby achieving precise deposition despite the harmful properties of the material
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 the formation of 3D parts and support structures with high resolution and precision, overcoming the limitations of existing systems by allowing for the precise control of droplet size and deposition of metallic salts, facilitating the creation of complex geometries and reducing material waste.
Implementation Method 1
electrostatic distortions of a drop from each nozzle selectively launches droplets of the consumable material in response to changes of the potential of a nozzle by its driver
Implementation Method 2
providing a melt pool configured to retain and dispense a consumable material and an array of channels in fluid communication with the melt pool
Data Source
AI summary
A method to form a part in an additive manufacturing system includes providing a melt pool configured to retain and dispense an electrically resistive consumable material and an array of channels in fluid communication with the melt pool. The method includes providing an array of channels in fluid communication with the melt pool, where each of the array of channels have a hollow electrically conductive nozzles wherein each of the array of nozzles is coupled to a distal end of one of the array of channels such that the consumable material can flow from the melt pool to each of the nozzles. The method includes providing a grid spaced from of the array of nozzle array wherein the grid defines a uniform ground potential, wherein the ground potential of the grid is substantially the same as a potential of the part being printed and the consumable material spaced from the grid. A plurality of drivers is in electric communication with the array of nozzles wherein each of the drivers is configured to modulate a voltage of a single nozzle of the array of nozzles wherein a difference in voltage from the array of nozzles to the ground potential allows passage of droplets of the consumable material to be ejected from each nozzle and pass through the grid, whereby electrostatic distortions of a drop from each nozzle selectively launches drops of support in response to changes of the potential of a nozzle by its driver such that consumable material is deposited in a layer by layer manner to form a portion of a mold for a part. The method includes depositing molten part material within the mold.