Reticulated Metal Foam Casting With 3D-Printed Wax Patterns
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Solution Overview
Problem
Current methods for manufacturing inorganic reticulated foam structures are limited by the use of plastic foams as precursors, leading to inconsistent pore sizes, structural variability, high environmental impact, high energy costs, and limited manufacturing capabilities.
Innovation Solution
Utilizing 3D printing technology to create wax or resin precursors, allowing for precise control over pore sizes and ligament densities, enabling heterogeneous structures and reducing the need for secondary machining processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional reticulated plastic foam is used as precursor, then manufacturing process is simple, but pore size consistency and structural uniformity are poor
Solution Approach 1:
The patent changes the physical state and material composition parameters of the precursor from conventional plastic foam to wax-based material. This allows precise control over pore size (5-50 PPI) and ligament thickness through wax selection and printing parameters, achieving consistent pore sizes while maintaining manufacturing feasibility through additive manufacturing processes.
Solution Approach 2:
The patent performs preliminary action by creating a wax precursor model with exact desired pore size and ligament structure before the actual metal foam manufacturing. The wax precursor is 3D printed with precise geometric control, then used as a pattern for investment casting, ensuring structural uniformity is established before metal formation.
2Object-affected harmful factors
If plastic foam precursor is used, then manufacturing process is straightforward, but environmental impact and energy consumption increase
Solution Approach 1:
The patent changes the material composition parameter from plastic foam to wax-based precursor. Wax eliminates the need for high-temperature combustion required for plastic foam removal, reducing harmful emissions and energy consumption while maintaining the investment casting manufacturing process simplicity.
Solution Approach 2:
The patent converts the traditional harmful plastic foam combustion process into a beneficial wax-based system. Instead of burning plastic at high temperatures which creates pollution, the wax precursor is removed through melting and washing, transforming an environmentally harmful process into an eco-friendly manufacturing approach.
3Adaptability or versatility
If homogeneous porosity is used throughout the structure, then manufacturing is simpler, but system optimization capability is reduced
Solution Approach 1:
The patent applies local quality by enabling different pore sizes and ligament densities in different regions of the same metal foam structure. The wax precursor can be 3D printed with spatially varying porosity (5-50 PPI ranges) to optimize local mechanical properties, thermal conductivity, or fluid flow characteristics for specific application requirements.
Solution Approach 2:
The patent introduces dynamics by allowing the precursor structure to be digitally designed and dynamically adjusted before manufacturing. Computer-aided design software enables optimization of pore distribution and ligament thickness in real-time based on performance requirements, then translates these dynamic designs into physical wax precursors for casting.
4Manufacturing precision
If additional processing steps are added to improve precision, then manufacturing precision improves, but production time and cost increase
Solution Approach 1:
The patent performs preliminary action by incorporating all precision requirements into the wax precursor design stage. Ligament density, pore size, and structural geometry are precisely controlled during 3D printing of the wax model, eliminating the need for post-processing steps to achieve desired precision, thus maintaining high productivity.
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
Achieves consistent pore sizes and densities, reduces environmental impact, decreases production costs, and enhances manufacturing flexibility, enabling complex geometries and reduced energy consumption.
Implementation Method 1
Utilizing 3D printing technology to create wax or resin precursors
Implementation Method 2
A casting flask or sleeve is placed on a vibrating table with the pattern disposed therein
Implementation Method 3
The furnace is then heated to a temperature and held for a time to remove water from the investment and volatize the wax or resin precursor
Implementation Method 4
The investment is then removed from the furnace and molten metal or other substance is poured into the investment
Implementation Method 5
removing the mold by washing or mechanical breaking to generate a reticulated metal foam material
Data Source
AI summary
A new method of manufacturing a dual investment reticulated solid mold for producing reticulated metal foam, that includes 3D printing of a wax or resin reticulated precursor prior to pre-investment with a pre-investment plaster or pre-investment ceramic plaster, and removal of the precursor before addition of liquid metal to generate reticulated metal foam.