Journal ArticleDOI
Magnetorheological nano-finishing of diamagnetic material using permanent magnets tool
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In this article, the cylindrical permanent magnet tool with magnetorheological polishing fluid at its tip surface is rotated over the copper alloy workpiece surface and performs finishing by the stiffened magnetoric polishing fluids, and the results obtained from finite element analysis and experimentation assure that the new design of permanent magnetors is capable to nano-finish of diamagnetic materials such as copper alloy etc.Abstract:
Nano-finishing of a material surface is one of the most required properties in industry. There is high need of nano-finishing of diamagnetic materials such as copper and its alloys in electronic industries and electrode of electric discharge machining. Some industries like laser, aerospace, dentistry and metal optics etc. widely use highly finished copper mirrors. As copper is soft and chemically reactive material, its surface finishing at nano level is a difficult tasked. To fulfill this need, a new magnetorheological technique for precise surface finishing of diamagnetic materials has been conceptualized. Two cylindrical permanent magnets along with magnetorheological polishing fluid have been used to finish the diamagnetic copper alloy workpiece. The cylindrical permanent magnets tool with magnetorheological polishing fluid at its tip surface is rotated over the copper alloy workpiece surface and performs finishing by the stiffened magnetorheological polishing fluid. The permanent magnets finishing tool along with magnetorheological polishing fluid at its tip surface and diamagnetic copper workpiece have been modeled as well as simulated in Maxwell Ansoft V13 (student version) software. Distribution of magnetic flux density in the working gap is obtained and analyzed. Experiments are performed on the copper alloy workpiece and least Ra value of 28.8 nm is achieved in finishing time of 7.5 min from its initial value of 273.6 nm. Surface characteristics of both polished and unpolished workpiece are analyzed with the scanning electron microscopy (SEM) and atomic force microscopy (AFM). The results obtained from finite element analysis and experimentation assures that the new design of magnetorheological finishing tool using permanent magnets is capable to nano-finish of diamagnetic materials such as copper alloy etc.read more
Citations
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Journal ArticleDOI
Experimental and theoretical investigation into surface roughness and residual stress in magnetorheological finishing of OFHC copper
TL;DR: In this paper, a wheel-based magnetorheological finishing (MRF) process is used to attain nanolevel surface roughness of oxygen-free high conductivity (OFHC) copper.
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Region adaptive scheduling for time-dependent processes with optimal use of machine dynamics
TL;DR: Gaussian mixture model (GMM) is proposed to model experimental tool influence functions (TIF) and this leads to a general analytical convolution model integrating processing depth, volumetric removal rate of TIF, path spacing and feedrate, suitable for any kind of smooth time-dependent processing beam.
Journal ArticleDOI
Modeling of material removal in magnetic abrasive finishing process with spherical magnetic abrasive powder
TL;DR: In this paper, the authors describe the application of a magnetic abrasive finishing (MAF) process to yield a fine finish on planar workpiece (SS304), which is a flexible abrasive brush using diamond particles embedded in a spherical iron matrix.
Journal ArticleDOI
An overview of magnetorheological polishing fluid applied in nano-finishing of components:
TL;DR: In this paper, the authors discuss the most crucial factor affecting the product lifespan and performance of any component, such as surface quality, which is the most important factor for any component.
Journal ArticleDOI
A review on magnetically assisted abrasive finishing and their critical process parameters
Chinu Kumari,Sanjay Kumar Chak +1 more
TL;DR: Magnetically assisted abrasive finishing (MAAF) processes are the precision material removal processes that have been applied to a large variety of materials from brittle to ductile and from magnetic to non magnetic as discussed by the authors.
References
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Journal ArticleDOI
Design and development of the magnetorheological abrasive flow finishing (MRAFF) process
Sunil Jha,Vijay Kumar Jain +1 more
TL;DR: In this paper, a new precision finishing process for complex internal geometries using smart magnetorheological polishing fluid is developed, which is used to precisely control the finishing forces, hence final surface finish.
Proceedings ArticleDOI
Magnetorheological finishing (MRF) in commercial precision optics manufacturing
TL;DR: The magnetorheological finishing (MRF) as mentioned in this paper is a sub-aperture lap process that requires no specialized tooling, because the magnetically-stiffened abrasive fluid conforms to the local curvature of any arbitrarily shaped workpiece.
Book
Engineering Electromagnetics
TL;DR: In this article, the authors present a comprehensive two-semester textbook on electromagnetic field equations and their application in modern life, including the applications involving electromagnetism, such as the generation and transmission of electric energy, electric motors and actuators, radio, television, magnetic information storage and even the mundane little magnet used to hold papers to the refrigerator.
Journal ArticleDOI
Experiments and observations regarding the mechanisms of glass removal in magnetorheological finishing
TL;DR: Drag force measurements and atomic force microscope scans demonstrate that, when added to a MR fluid, nonmagnetic abrasives are driven toward the workpiece surface because of the gradient in the magnetic field and hence become responsible for material removal.
Journal ArticleDOI
Review on copper chemical–mechanical polishing (CMP) and post-CMP cleaning in ultra large system integrated (ULSI)—An electrochemical perspective
Yair Ein-Eli,David Starosvetsky +1 more
TL;DR: In this article, the authors describe electrochemical evaluation and study of copper chemical-mechanical polishing (CMP) slurries and post-CMP cleaning solutions and two novel systems based on alkaline weak acid salts (K-sorbate and K-carbonate) are reviewed.
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