Localized Magnetic Fluid Finishing of Freeform Surfaces Using Electro-Permanent Magnets and Magnetic Concentration
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We report the implementation of a novel magnetic concertation setup for localized finishing of freeform surfaces based on employing electro-permanent magnet arrays configured using a recently developed magnetic concentration principle. The setup, without the use of any rotating or moving component, is capable of creating a localized spatiotemporal magnetic field variation in the specialized magnetic fluid to polish a target 1.5cm^2 area on the workpiece surface. Using a computational mechanistic model as well as experimental studies, we show that the current configuration of electro-permanent magnets is capable of amplifying the magnetic strength by almost 3 times near the workpiece surface in comparison to no magnetic concentration. We also show that by modulating the strength, including toggling the polarity of electro-permanent magnets, we demonstrate the sloshing motion of the fluid at a targeted region without requiring any rotating part. A set of experiments was conducted to study the capabilities of the experimental setup. The first experimental investigation looked at the localized and selective removal of acrylic paint applied from a differential geometry. The second experimental study looked at improving the surface roughness of 3D printed polyurethane dogbone samples. The process was capable of reducing the SA values from 11 µm initially to .7 µm. 1 Parts of the abstract are reprinted with permission from “Localized magnetic fluid finishing of freeform surfaces using electropermanent magnets and magnetic concentration” by Iskander El-Amri, Ashif Sikandar Iquebal, Arun Srinivasa, Satish Bukkapatnam, 2019. Journal of Manufacturing Processes,2018 https://doi.org/10.1016/j.jmapro.2018.05.026 , Copyright 2018 by Elsevier
El Amri, Iskander (2018). Localized Magnetic Fluid Finishing of Freeform Surfaces Using Electro-Permanent Magnets and Magnetic Concentration. Master's thesis, Texas A & M University. Available electronically from
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