3D Printing Device for Functionally Gradient Materials
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Solution Overview
Problem
Existing 3D printing technologies face challenges in manufacturing continuous functionally gradient materials and complex three-dimensional structures, particularly with polymer-based materials, due to issues like poor geometric shape control, surface roughness, interlayer bonding strength, and consistency, especially when dealing with high-solid-content or micro-scale fillers, which affect the printing efficiency and quality of the final products.
Innovation Solution
A 3D printing device and method incorporating an active mixing module with ultrasonic vibration, a passive mixing and printing module, and a constraining and sacrificial layer printing module, which enables uniform mixing and precise control of material composition, preventing settling and ensuring stable printing of continuous functionally gradient materials and complex structures by using a three-stage mixing process and a two-step curing strategy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional fabrication methods are used to manufacture functionally gradient materials, then the material structure can be formed, but the manufacturing efficiency is low and the process is complex
Solution Approach 1:
The patent changes the fundamental manufacturing parameters by transitioning from traditional layer-by-layer deposition to continuous material extrusion with real-time composition adjustment. The system uses variable viscosity materials and continuous gradient formulation to achieve functionally gradient structures in a single continuous process, eliminating the need for multiple fabrication steps and significantly improving manufacturing efficiency while reducing process complexity
Solution Approach 2:
The patent employs composite materials with varying compositions to create functionally gradient structures. By using materials with different viscosities, filler contents, and rheological properties in a continuous extrusion process, the system can manufacture complex three-dimensional parts with spatially varying material properties in one operation, thereby improving productivity and simplifying the manufacturing process
2Reliability
If high-solid-content materials are used in 3D printing, then the functional gradient can be enhanced, but the material settling occurs during printing
Solution Approach 1:
The patent introduces dynamic control of material properties during the printing process. The system continuously adjusts material composition, viscosity, and flow characteristics in real-time to prevent settling while maintaining high-solid-content functional gradients. This dynamic adjustment ensures both gradient consistency and material uniformity throughout the printing process
Solution Approach 2:
The system changes material parameters such as viscosity and flow rate dynamically during printing. By adjusting these parameters in real-time based on the printing stage and material composition, the system prevents settling of high-solid-content materials while maintaining the desired functional gradient structure, thus ensuring both reliability and compositional stability
3Shape
If conventional 3D printing is used for complex structures, then the geometric shape can be formed, but the surface roughness increases and geometric shape resolution deteriorates
Solution Approach 1:
The patent replaces conventional mechanical extrusion with a system that uses controlled material flow and in-situ curing. By substituting mechanical layer-by-layer deposition with continuous material delivery and immediate structural stabilization through curing, the system achieves both high geometric shape resolution and smooth surface quality on complex three-dimensional structures
4Adaptability or versatility
If multi-material mixing is performed during printing, then the functionally gradient material can be created, but the mixing uniformity is poor
Solution Approach 1:
The patent performs preliminary mixing and preparation of material compositions before the actual printing process. By pre-mixing materials to achieve uniform distribution of components and adjusting material properties in advance, the system ensures both composition flexibility for functional gradients and mixing uniformity during the printing process
Solution Approach 2:
The system introduces intermediary materials or agents that facilitate uniform mixing of multi-component formulations. These intermediaries help maintain homogeneity while allowing continuous adjustment of material composition for different functional gradient requirements, thus achieving both versatility and mixing uniformity
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
The solution enhances the printing efficiency, improves the consistency and interlayer bonding strength of functionally gradient materials, and allows for the production of complex three-dimensional structures with better geometric shape resolution and surface quality, addressing the limitations of existing technologies.
Implementation Method 1
an active mixing module (4), wherein an input end of the active mixing module (4) is connected to a plurality of anti-settling feeding modules (2, 3) so that a plurality of materials are actively mixed; the active mixing module (4) includes a vibrational mixing chamber (405) and an active stirring screw (406) mounted in the vibrational mixing chamber (405), and the vibrational mixing chamber (405) is capable of ultrasonic vibration
Implementation Method 2
a UV curing module (19) mounted on the XYZ three-axis module (11, 22, 7), the UV curing module (19) including a UV curing unit (1901) and a cylinder module (1903) capable of driving the UV curing unit (1901) to move up and down; moving the UV curing unit (1901) to a printing station IIIA, and enabling the cylinder module (1903) to drive the UV curing unit (1901) to descend to a printing station IIIB; precuring the printed functionally gradient layer according set time by UV-photocuring
Data Source
AI summary
A 3D printing device and method for integrated manufacturing of functionally gradient materials and three-dimensional structures. The device includes an active and passive mixing and printing module and a constraining and sacrificial layer printing module. An input end of the active mixing module connects to multiple anti-settling feeding modules, and an output end of the active mixing module connects to the passive mixing and printing module. The passive mixing and printing module and the constraining and sacrificial layer printing module are mounted on one side of an XYZ three-axis module. The constraining and sacrificial layer printing module connects to a constraining and sacrificial layer feeding module and prints and forms a functionally gradient three-dimensional structure. The 3D printing device and method of the invention can realize integrated manufacturing of continuous functionally gradient materials and complex three-dimensional structures, and have the advantages of high printing efficiency and low cost.