Divergent Nozzle Design for Additive Manufacturing
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Solution Overview
Problem
Conventional convergent printheads in additive manufacturing often fail to create strong bonds between microstructure layers, particularly along the Z-axis, leading to poor layer integrity and increased shear forces, compromising the strength of 3D printed parts.
Innovation Solution
A testbed platform with a divergent nozzle design and magnetic inks loaded with nanoparticles, utilizing electromagnets and microfluidic flow cells to determine optimal nozzle geometry and magnetic field alignment for reduced shear forces and improved fiber orientation during the additive manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional convergent printheads are used, then material deposition is achieved, but layer bonding strength deteriorates due to insufficient material deposition and poor layer integrity
Solution Approach 1:
The patent inverts the conventional convergent nozzle design by using a divergent nozzle geometry where the channel width increases in the flow direction rather than decreasing. This inversion allows material to be deposited with a wider spread, improving layer bonding strength and layer integrity by ensuring sufficient material deposition across the layer interface while reducing shear forces at the deposition point
2Strength
If conventional convergent printheads are used, then material deposition is achieved, but shear forces increase resulting in compromised strength in 3D printed parts
Solution Approach 1:
By inverting the nozzle geometry from convergent to divergent, the patent reduces the shear forces experienced by the material at the deposition point. The divergent channel geometry allows material to flow more smoothly with less abrupt changes in cross-sectional area, thereby reducing shear forces while maintaining or improving part strength through better layer bonding
3Strength
If divergent nozzle design is implemented, then shear forces are reduced and layer bonding is improved, but device complexity increases due to interchangeable channels and microfluidic components
Solution Approach 1:
The patent employs interchangeable channels that can be swapped to modify nozzle geometry for different applications. These multi-functional components allow the same base device to perform multiple functions by simply changing the inserted channel, thereby reducing the need for multiple complete devices while maintaining the ability to optimize for different material properties and printing requirements
Solution Approach 2:
The nozzle system is segmented into modular components including interchangeable channels, microfluidic flow cells, and needle tips that can be independently selected and replaced. This segmentation allows complex functionality to be achieved through simple modular assemblies rather than monolithic complex designs, making the system more manageable and adaptable
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 divergent nozzle design and magnetic field alignment enhance material bonding and reduce shear forces, resulting in improved mechanical properties and layer integrity of 3D printed parts by controlling fiber orientation and nanoparticle alignment.
Implementation Method 1
The electromagnets may have a variable field strength and apply an external magnetic field to the magnetic nanoparticles
Implementation Method 2
magnetic inks may be thermoset composite inks loaded with magnetic nanoparticles
Data Source
AI summary
Various embodiments are directed to a testbed platform for characterizing materials and inks utilized in additive manufacturing of nanocomposites. The system may include a testbed base coupled to a group of electromagnets. The base may include an aperture for housing a microscope slide and an interchangeable channel including a microfluidic flow cell of various geometric angles. The system may further include a group of needle tips in fluidic communication with the microfluidic flow cell. The needle tips may be coupled, via lock connectors, to syringes that dispense magnetic inks utilized in additive manufacturing into the microfluidic flow cell. The system may also include an inverted microscope lens and a high-speed camera in optical communication with the base. The camera may be utilized to capture images of a flow behavior of the magnetic inks for performing an analysis that determines a nozzle design for microdispensing during an additive manufacturing process.