Liquid Metal Jet Printing with Targeted Heating for Stronger Builds
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Solution Overview
Problem
Conventional liquid metal jet printing systems face issues with inconsistencies in build strength, adhesion, porosity, surface finish, cracking, and z-height errors due to inadequate interfacial temperatures and thermal processes, requiring secondary machining and finishing processes that reduce productivity and increase costs.
Innovation Solution
The implementation of a targeted heating system that heats the substrate and area proximal to it, using lasers to control interfacial temperatures and temperature gradients, thereby modifying grain size, growth, and structure of the metal droplets to improve mechanical properties and surface finish without the need for post-printing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional liquid metal jet printing is used, then the printing process can be completed, but the articles exhibit inconsistencies in build strength, adhesion, porosity, surface finish, cracking, and z-height errors
Solution Approach 1:
The substrate is preheated to a controlled temperature range (e.g., 50-150°C) before metal droplet deposition. This preliminary thermal preparation ensures optimal interfacial conditions for droplet adhesion and reduces thermal shock, thereby improving build strength and eliminating cracking while maintaining manufacturing precision
Solution Approach 2:
The system dynamically controls substrate temperature, droplet temperature, and interfacial temperature gradients during the printing process. By adjusting these thermal parameters in real-time, the system achieves consistent adhesion, eliminates porosity and cracking, and maintains precise z-height control across all printed articles
2Manufacturing precision
If secondary machining and finishing processes are implemented, then inconsistencies in articles are addressed, but productivity is greatly reduced and cost increases
Solution Approach 1:
The substrate and metal droplets are preheated during the printing process itself, ensuring proper adhesion and minimal defects are achieved in-situ. This eliminates the need for post-printing machining and finishing operations, maintaining high productivity while achieving excellent surface finish and dimensional accuracy
Solution Approach 2:
The heating system is integrated directly into the printing process, combining thermal preparation and material deposition into a single unified operation. This merger eliminates separate post-processing steps, thereby maintaining high fabrication throughput while achieving consistent surface finish and dimensional precision
3Productivity
If metal droplets are ejected and cooled rapidly on the substrate, then the printing process is efficient, but inconsistencies in adhesion, cracking, and z-height errors occur
Solution Approach 1:
The substrate is preheated before droplet deposition, creating a thermal buffer that reduces thermal shock during rapid cooling. This allows fast printing speeds to be maintained while ensuring consistent adhesion and eliminating cracking that would otherwise occur with rapid temperature changes
Solution Approach 2:
The system controls the temperature differential between the incoming metal droplets and the substrate by adjusting substrate preheat temperature and droplet heating. This parameter optimization enables rapid cooling for high productivity while maintaining adhesion consistency and dimensional accuracy
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 enhances build strength, adhesion, and surface finish while preventing cracks and fractures, maintaining productivity by integrating heating within the printing process, thus eliminating the need for secondary operations.
Implementation Method 1
liquid metal jet printing, such as magnetohydrodynamic (MHD) liquid metal jet printing, includes ejecting liquid or molten metal drops from a printhead
Implementation Method 2
The implementation of a targeted heating system that heats the substrate and area proximal to it, using lasers to control interfacial temperatures
Data Source
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AI summary
Additive manufacturing devices and methods for the same are provided. The additive manufacturing device may include a stage configured to support a substrate, a printhead disposed above the stage, and a targeted heating system disposed proximal the printhead. The printhead may be configured to heat a build material to a molten build material and deposit the molten build material on the substrate in the form of droplets to fabricate the article. The targeted heating system may be configured to control a temperature or temperature gradient of the droplets deposited on the substrate, an area proximal the substrate, or combinations thereof.