3D Fabrication Using Disposable Substrate Layers
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Solution Overview
Problem
Current 3D fabrication methods are limited in their ability to produce composite materials with high strength and low weight, and they often struggle with creating large objects efficiently, while also being restricted by the need for precise equipment like precision ovens.
Innovation Solution
A method involving the selective deposition of thermoplastic or thermosettable powder on substrate layers, where the powder is melted and solidified to bond the layers together, allowing for the use of various materials and enabling the creation of large, strong, and lightweight 3D objects through a process that can be automated and controlled by computer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional 3D fabrication methods are used, then manufacturing precision can be achieved, but device complexity increases due to the need for precision ovens and complex equipment
Solution Approach 1:
The patent uses disposable substrate layers (such as water-soluble PVA sheets or sacrificial support structures) that are temporarily present during fabrication and then removed. These substrate layers provide structural support and define the build volume during printing, but are discarded after the final object is formed, eliminating the need for complex precision ovens and heating systems required in traditional methods.
Solution Approach 2:
The substrate layers act as intermediaries between the digital model and the final physical object. They provide a temporary platform for depositing material layers and support structures, mediating the fabrication process without requiring complex equipment. The substrate is selectively removed afterward to reveal the final object.
2Strength
If traditional composite material fabrication is used, then material strength can be achieved, but productivity decreases due to time-consuming processes
Solution Approach 1:
The patent incorporates reinforcement fibers (such as carbon fiber, glass fiber, or natural fibers) into the material layers before or during the deposition process. This preliminary incorporation of strengthening elements allows the material to achieve high strength properties without requiring subsequent time-consuming post-processing steps like autoclaving or chemical treatments, thereby maintaining high productivity.
Solution Approach 2:
The patent creates composite materials by combining a matrix material (such as polymer powder or slurry) with reinforcement fibers. This composite structure provides high strength and desirable mechanical properties while maintaining rapid fabrication speeds, as the fibers are integrated directly during the layer-by-layer deposition process without additional processing time.
3Manufacturing precision
If precise equipment like precision ovens is used, then manufacturing precision is maintained, but ease of manufacture decreases
Solution Approach 1:
The fabricated object or structure performs self-service functions during the manufacturing process. The substrate layers automatically provide support and define geometry without requiring external precision equipment. The material deposition process itself self-aligns layers through the substrate guidance, eliminating the need for precision ovens and complex alignment mechanisms, thereby simplifying manufacture while maintaining precision.
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 enables the rapid production of composite materials with desirable properties, such as high strength and low weight, and allows for the creation of larger objects than previous technologies, with the ability to color and decorate parts, while reducing the need for precise equipment.
Implementation Method 1
Heat is applied (or heat and pressure are applied) to the powder and substrate, causing the powder, not the substrate, to melt.
Implementation Method 2
The resulting molten material then cools and solidifies.
Data Source
Figure 1A
Figure 1B
Figure 2A~2C
AI summary
In an illustrative implementation of this invention, a 3D object comprises substrate layers infiltrated by a hardened material. The 3D object is fabricated by a method comprising the following steps: Position powder on all or part of a substrate layer. Repeat this step for the remaining substrate layers. Transform the powder into a substance that flows and subsequently hardens into the hardened material. The hardened material solidifies in a spatial pattern that infiltrates positive regions in the substrate layers and does not infiltrate negative regions in the substrate layers.