Wire-Fed Metal 3D Printing With Resistive Droplet Deposition
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Solution Overview
Problem
Existing additive manufacturing techniques for metallic parts face challenges such as high costs, safety risks, and inefficiencies due to the use of metal powders, which require excessive heat and result in waste and slow processing times.
Innovation Solution
The method involves using metal wire as feedstock, heated by electric current at the point of contact to form molten droplets for layer-by-layer fabrication, eliminating the need for sintering steps and reducing heat input, while leveraging established technologies like GMAW and RSW for precise control and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal powder is used as feedstock for additive manufacturing, then the process can build metal structures layer by layer, but the process becomes slow and expensive due to the need to spread powder across the entire build area for each layer
Solution Approach 1:
The patent segments the build area into only the necessary regions where material deposition is required, rather than treating the entire build area as active. This allows the system to focus energy and material placement only where needed, eliminating the time-consuming step of spreading powder across the full build area and significantly improving manufacturing speed.
2Strength
If laser sintering is used to fuse metal particles, then metal structures can be formed, but excessive heat is required and safety risks increase due to laser hazards
Solution Approach 1:
The patent replaces the optical/mechanical laser sintering system with an electrical resistance heating system. Instead of using a high-power laser to fuse metal particles, the invention uses electric current passed through the metal wire feedstock and build plate to generate heat via electrical resistance, eliminating laser safety hazards and reducing excessive heat input.
Solution Approach 2:
The patent changes the heating parameter from optical energy (laser) to electrical energy (electric current). This parameter change fundamentally alters the heating mechanism, allowing for more precise thermal control and eliminating the safety risks associated with high-power lasers while maintaining the ability to fuse metal particles effectively.
3Productivity
If metal powder is used in additive manufacturing, then layer-by-layer construction is possible, but material waste increases and cost increases due to the large amount of powder required to fill the build area
Solution Approach 1:
The patent extracts the unnecessary material from the process by using wire feedstock instead of powder. This allows material to be deposited only in the exact locations and amounts needed for the part geometry, eliminating the waste inherent in powder-based systems where the entire build area must be filled with powder that is later removed or reused.
Solution Approach 2:
The patent eliminates the need for powder recovery and reuse operations by using consumable wire feedstock. The wire is fed continuously and consumed only where material is needed, removing the complex powder handling, spreading, and recovery infrastructure required in traditional powder-based additive manufacturing systems.
4Ease of operation
If metal powder handling is performed in conventional additive manufacturing, then feedstock can be supplied to the build area, but safety risks increase due to dust inhalation and explosion hazards
Solution Approach 1:
The patent creates an inert environment by using wire feedstock instead of loose powder. Wire form factor eliminates the dust generation inherent in powder handling, removing the need for complex dust collection, ventilation, and explosion prevention systems while maintaining safe feedstock supply to the build area.
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
This approach minimizes waste, reduces safety concerns, and enables faster, more cost-effective production of metallic parts with improved resolution and versatility across various metals and alloys, using inert gas shielding and computer-controlled motion for precise deposition.
Implementation Method 1
heated by electric current at the point of contact to form molten droplets
Implementation Method 2
form molten droplets for layer-by-layer fabrication
Implementation Method 3
using inert gas shielding
Data Source
AI summary
The present disclosure provides a system for printing a three-dimensional (3D) object. The system may comprise a source of at least one feedstock, a support for supporting at least a portion of the 3D object, a feeder for directing such feedstock from the source towards the support, and a power supply for supplying electrical current. The system may comprise a controller operatively coupled to the power supply. The controller may receive a computational representation of the 3D object. The controller may direct such feedstock through a feeder towards the support and may direct electrical current through such feedstock and into the support. The controller may subject such feedstock to heating such that at least a portion of such feedstock may deposit adjacent to the support. The controller may direct deposition of additional portions adjacent to the support and may direct an additional feedstock through such feeder and subject to heating.