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3d printing of polymer-bonded rare-earth magnets with a variable magnetic compound fraction for a predefined stray field

by:Maghard      2020-02-22
Additive manufacturing of polymer
Adhesive magnets are a technology recently developed for single
Unit production, and structures that were previously impossible to manufacture.
In addition, a new possibility of creating a specific Miscellaneous field around the is triggered.
The current work proposes a method for 3D printing polymer
Bonded magnets with variable magnetic compound fraction distribution.
This means that the saturation magnetic strength can be adjusted during the printing process to obtain the external magnetic field required for the manufactured . A low-cost, end-
User 3D printer with hybrid extruder for mixing permanent filament with pure polyamide (PA12)filaments.
Magnetic filaments are composite, extruded and characterized for the printing process.
In order to infer the mass of the manufactured with variable magnetic compound fraction, a reverse stray field frame was developed.
The effectiveness of the printing process and simulation methods is demonstrated.
It can also be used to make magnets that produce predefined stray fields within a given area.
This opens up new possibilities for the application of magnetic sensors.
This setup and simulation framework allows the design and manufacture of polymers
Adhesive permanent magnets that cannot be made by traditional methods.
Additive manufacturing is an affordable and fast technology for manufacturing models, tools, prototypes, or end products.
Production is directly from the invisible (
Liquid, powder, etc. )or form-neutral (tape, wire)
Material, mainly through a thermal or chemical process.
Specific tools are not required for specific objects that may have complex shapes. A well-
The additive manufacturing method established is the modeling of molten deposition (FDM)technology.
Also known as 3D printing, is a process of using wires
Formed hot plastic filament.
With the help of a moving heating extruder, the filament is heated above the softening point.
The molten thermoplastic is squeezed out of the print head nozzle and piled up the object layer by layer on the material already cured on the building platform.
Because 3D printers are now affordable for terminals.
The prosperity of users, new possibilities has been triggered.
3D printing technology is a fast
Single growth area
Unit production, which allows the production of structures that were previously difficult or impossible to build.
NdFeB magnets are mainly divided into sintering magnets and polymer magnets. bonded magnets.
On the one hand, the sintering has the highest maximum energy product ();
Polymer, on the other hand-
The bonded is capable of making complex shapes and magnetized structures, but has a lower ()
Therefore, no matter the cost of the product is the main consideration of magnetic energy, they are widely used.
From sensors to actuator applications, adhesive magnets offer a wide range of applications. Polymer-
Adhesive magnets are composite materials with permanent
Magnet powder embedded in the polymer adhesive matrix.
Ferrite (hard magnetic particles)e. g. , Sr, Ba), and rare-
Earth materials (e. g. , NdFeB)
Volume filling is between 40-65 volumes. % are inserted.
These compounds can be further processed by injection molding or extrusion.
The NdFeB particles of the compound are produced by a melt rotation process.
In order to obtain better flow properties, spherical particles are preferred, which can be produced through an inert gas atomization process.
In order to reduce the cost of assembly and gain greater flexibility, magnetic homophobic powder is the first choice.
The high filler content increases the viscosity of the molten compound.
In order to avoid nozzle blockage, the matrix polymer should be a material with high fluidity;
Good mechanical performance is also an important aspect. Polyamides (
6. PA11 and PA12)
There is a good combination of these qualities.
Recently it shows an end
Users can print polymer using 3D printer-bonded rare-
Earth magnets with complex shapes.
Prefabricated magnetic compounds (Neofer 25/60p)
It has been used from Bonn fabrik Bonn Co. , Ltd.
It is by 90 weight.
NdFeB particles in % PA11 matrix.
The effectiveness of this printing method is demonstrated by the manufacture of a with a complex shape, which is known to produce a specific Miscellaneous field above the printed .
Structure with size less than 0.
8mm, height below 0.
1mm is possible.
Contrary to the well-
Built, affordable, accurate, highresolution end-
3D printing technology for users, manufacturing of large area materials (BAAM)of large-
Scale NdFeB magnets are presented in the references. .
The BAAM method works the same way as traditional 3D printers.
One advantage of this approach is the possibility of manufacturing large
Scaling the object, the disadvantage is the high cost of the system, due to the large size of the printer nozzle, the printing of fine structure is impossible.
Currently, however, there are no other singles
The use of unit manufacturing technology to produce magnets with complex shapes;
There is no waste of materials and minimal raw materials, and there is no chance of making objects.
This may be an important aspect of reducing rare species.
Earth elements in permanent magnets.
In this work, a method of manufacturing polymer
A bonded permanent with variable magnetic compound fractions along the printing direction is proposed, where it is defined as a fraction of the magnetic composite material from the entire volume extruded from the heated printer nozzle.
The filling fraction of the magnetic material is proportional to the residual magnetic.
This can be used to shape the magnetic field without changing the topology of the object.
First, the effectiveness of the method is shown.
In addition, a finite element-based reverse Miscellaneous Field method is developed, which allows to infer the magnetic compound fraction and the magnetic distribution of the from the Miscellaneous Field measurement.
This method can be used to evaluate the quality of printed magnets.
In addition, the inverse method allows us to find the optimal magnetic density distribution for a given target field.
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