Extrudable Magnetic Ink for Complex Bonded Magnet 3D Printing
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Solution Overview
Problem
Conventional methods for producing bonded magnets require specific tooling, limiting shape flexibility and increasing fabrication costs, while 3D printing offers unparalleled geometric flexibility but lacks effective methods for fabricating bonded magnets.
Innovation Solution
A magnetic ink composition comprising magnetic particles, a polymer binder, and a solvent is developed for 3D printing, allowing for the extrusion of a continuous filament that can be deposited on a substrate to form bonded magnets, with optional alignment using magnetic fields and curing to enhance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional molding techniques (injection molding, compression molding, extrusion molding) are used to produce bonded magnets, then manufacturing process is well-established and reliable, but shape flexibility and complexity are limited and specific tooling is required for each design
Solution Approach 1:
The patent changes the physical state and flow characteristics of the magnetic material by formulating it as a slurry with specific viscosity parameters. This allows the material to be extruded through a nozzle in a controlled flow state and then solidify into the desired shape, enabling complex geometries without requiring complex tooling for each design
Solution Approach 2:
The patent develops a universal extrusion-based 3D printing process that can fabricate bonded magnets of any complex shape using a single type of equipment (extrusion nozzle). This multi-functional approach eliminates the need for design-specific molds and tooling, allowing the same system to produce diverse magnet geometries by simply changing the digital model
2Ease of manufacture
If conventional molding techniques are used to produce bonded magnets, then manufacturing process is established, but fabrication cost increases due to specific tooling requirements
Solution Approach 1:
The patent optimizes the slurry formulation parameters including magnetic particle size distribution, binder composition, and solvent content to achieve the desired viscosity range. This parameter optimization ensures smooth extrusion flow while minimizing material waste and enabling cost-effective manufacturing without expensive tooling
Solution Approach 2:
The patent uses digital 3D models as templates to guide the extrusion process, where the digital geometry is directly translated into physical magnet shapes through layer-by-layer or continuous extrusion. This digital copying approach eliminates the need for physical molds and tooling for each design, significantly reducing fabrication costs
3Shape
If 3D printing is used to fabricate bonded magnets, then geometric shape flexibility and complexity are improved, but effective fabrication methods were previously lacking
Solution Approach 1:
The patent identifies and optimizes critical parameters including slurry viscosity (0.1-10 Pa·s), magnetic particle size (1-100 μm), and extrusion rate to ensure proper flow characteristics during printing. These parameter controls enable the material to be extruded smoothly and solidify into complex 3D geometries with high fidelity to the digital model
Solution Approach 2:
The patent develops a composite slurry material consisting of magnetic particles (e.g., NdFeB, ferrite), polymer binder, and solvent in specific proportions. This composite formulation provides the necessary rheological properties for extrusion while maintaining magnetic performance, enabling effective 3D printing of bonded magnets
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 method enables the fabrication of bonded magnets with improved mechanical properties and shape complexity, reducing costs and tooling requirements, while maintaining magnetic performance as shown by successful printing and characterization of NdFeB magnets.
Implementation Method 1
The ink composition is extruded through a nozzle to form a continuous filament that is deposited on a substrate
Implementation Method 2
optional alignment using magnetic fields
Data Source
AI summary
A magnetic ink composition for three-dimensional (3D) printing a bonded magnet is provided. The magnetic ink composition includes magnetic particles, a polymer binder and a solvent. A 3D printing method for fabrication of a bonded magnet using the magnetic ink composition is also provided.