scholarly journals Micro-Machining Characteristics in High-Speed Magnetic Abrasive Finishing for Fine Ceramic Bar

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 464 ◽  
Author(s):  
Joonhyuk Song ◽  
Takeo Shinmura ◽  
Sang Don Mun ◽  
Minyoung Sun
Keyword(s):  
Surface Roughness ◽  
High Speed ◽  
High Surface ◽  
Stable Region ◽  
Micro Machining ◽  
Fine Ceramic ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Finishing ◽  
Machining Characteristics ◽  
Diameter Change

The research aims to describe the micro-machining characteristics in a high-speed magnetic abrasive finishing, which is applicable for achieving the high surface accuracy and dimensional accuracy of fine ceramic bars that are typically characterized by strong hardness and brittle susceptibility. In this paper, the high-speed magnetic abrasive finishing was applied to investigate how the finishing parameters would have effects on such output parameters as surface roughness, variation of diameters, roundness, and removed weight. The results showed that, under variants of diamond abrasives sizing between (1, 3 and 9 µm), 1 µm showed comparatively good values as for surface roughness and roundness within shortest processing time. When the optimal condition was used, the surface roughness Ra and roundness (LSC) were improved to 0.01 µm and 0.14 µm, respectively. The tendency of diameter change could be categorized into two regions—stable and unstable. The finding from the study was that the performance of ultra-precision processing linear controlling was possibly achievable for the stable region of diameter change, while linearly controlling diameters in the workpiece.

Improvement of Magnetic-Abrasive Finishing of Nonuniform Products Made of High-Speed Steel in Digital Conditions

2020 ◽  
Vol 836 ◽  
pp. 71-77 ◽  
Author(s):  
Vyacheslav V. Maksarov ◽  
Aleksandr I. Keksin ◽  
Irina A. Filipenko
Keyword(s):  
Surface Roughness ◽  
High Speed ◽  
Magnetic System ◽  
High Speed Steel ◽  
Digital Technologies ◽  
Special Device ◽  
Processing Efficiency ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Finishing ◽  
Definition Of

The paper considers the implementation of magnetic-abrasive finishing in the conditions of digital technologies, in particular within CNC systems. The process was implemented through the development of a special device for MAF based on vertical processing center with CNC – Emco Concept Mill 250 and the definition of the combination of working motions of a billet in the interpole space of a magnetic system and their speeds. The result of the study are optimal combinations of working motions and their speeds taking into account formed surface roughness and processing efficiency.

scholarly journals Review of Superfinishing by the Magnetic Abrasive Finishing Process

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Lida Heng ◽  
Yon Jig Kim ◽  
Sang Don Mun
Keyword(s):  
High Surface ◽  
Processing Parameters ◽  
Engineering Industry ◽  
Advanced Materials ◽  
Surface Finishing ◽  
Magnetic Abrasive Finishing ◽  
Surface Finishes ◽  
Abrasive Finishing ◽  
Recent Developments ◽  
Finishing Processes

AbstractRecent developments in the engineering industry have created a demand for advanced materials with superior mechanical properties and high-quality surface finishes. Some of the conventional finishing methods such as lapping, grinding, honing, and polishing are now being replaced by non-conventional finishing processes. Magnetic Abrasive Finishing (MAF) is a non-conventional superfinishing process in which magnetic abrasive particles interact with a magnetic field in the finishing zone to remove materials to achieve very high surface finishing and deburring simultaneously. In this review paper, the working principles, processing parameters, and current limitations for the MAF process are examined via reviewing important work in the literature. Additionally, future developments of the MAF process are discussed.

Experimental Study on Mechanism and Performance of Magnetic Abrasive Finishing

2006 ◽  
Vol 304-305 ◽  
pp. 384-388
Author(s):  
Shu Ren Zhang ◽  
W.N. Liu
Keyword(s):  
Surface Roughness ◽  
Magnetic Force ◽  
Ferromagnetic Materials ◽  
Feed Speed ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Particles ◽  
Technical Parameters ◽  
Abrasive Finishing ◽  
Series Of Experiments ◽  
And Performance

Magnetic Abrasive Finishing (MAF) is relatively a new finishing technique that employs the magnetic force for finishing. In the paper, finishing mechanism of MAF is studied and four self-sharpening modes of abrasive particles are put forward. With the cylindrical magnetic abrasive apparatus designed and made by the author, a series of experiments on finishing the cylindrical surfaces of nonferromagnetic materials and ferromagnetic materials are carried out. The influence of technical parameters (finishing speed, feed speed, finishing time and so on) on finishing performance is analyzed. Choosing the optimized technical parameters, , the surface roughness of ferromagnetic materials changes from Ra 0.825µm to Ra 0.045µm after the 12-minute finishing experiment; the surface roughness of nonferromagnetic materials changes from Ra 0.434µm to Ra 0.096µm after the 20-minute finishing experiment.

Influence Of Substrate Off-Cut On The Defect Structure In Relaxed Graded Si-Ge/Si Layers

1996 ◽  
Vol 442 ◽  
Author(s):  
Srikanth B. Samavedam ◽  
F. Romanato ◽  
M. S. Goorsky ◽  
E. A. Fitzgerald
Keyword(s):  
Surface Roughness ◽  
Dislocation Structure ◽  
High Speed ◽  
High Surface ◽  
Substantial Improvement ◽  
Threading Dislocation ◽  
Threading Dislocation Density ◽  
Graded Layers ◽  
Spatially Variant ◽  
Edge Dislocations

AbstractRelaxed graded Si-Ge/Si layers can be used in a variety of micro-electronics applications such as templates for III-V/Si integration, in high speed field effect transistor (FET) structures and as detectors in optical communication. Each of these applications requires a different final Ge concentration in the graded Si-Ge layer. With increasing Ge content in the graded layer, some of the materials concerns that need to be addressed are- (i) a high surface roughness, (ii) the formation of dislocation pile-ups, and (iii) an increase in the threading dislocation density. We have shown that there is a substantial improvement in the surface roughness and the dislocation pile-up density of the graded Si-Ge layers by depositing on (001) 6° off-cut substrates. The substrate miscut also facilitates favorable intersections of {111} planes that aid reactions between the 60° dislocations to form edge dislocations with Burgers vectors of the type 1/2<110> and <100> resulting in a novel hexagonal dislocation structure. Such reactions occurred more readily in the Ge-rich regions of the graded layers where the growth temperature was high enough to aid dislocation climb. The edge dislocations with in-plane Burgers vectors lack a tilt component and the decreased rate of tilting in the Ge-rich regions is confirmed by triple crystal X-ray reciprocal space maps. This novel dislocation structure offers opportunities to explore new processes which may eliminate spatially variant strain fields in relaxed epitaxial layers.

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