A novel high efficiency magnetorheological polishing process excited by Halbach array magnetic field

2021 ◽  
Author(s):  
Yuanfan Guo ◽  
Shaohui Yin ◽  
Hitoshi Ohmori ◽  
Min Li ◽  
Fengjun Chen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Efficiency ◽  
Polishing Process ◽  
Halbach Array ◽  
Magnetorheological Polishing

scholarly journals Study on magnetorheological nano-polishing using low-frequency alternating magnetic field

2020 ◽  
Vol 12 (1) ◽  
pp. 168781401990072
Author(s):  
Jinzhong Wu ◽  
Shaohui Yin ◽  
Shengjie Yang ◽  
Yuanfan Guo
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
High Efficiency ◽  
Rotation Speed ◽  
Low Frequency ◽  
Alternating Magnetic Field ◽  
Improvement Rate ◽  
Current Frequency ◽  
Magnetorheological Polishing ◽  
K9 Glass

With the development of electronics and optical industry, the high-efficiency ultra-precision polishing technologies of flat and curved surfaces are in high demand. The traditional magnetorheological polishing technology, using flexible polishing head, has the disadvantages of low polishing efficiency and small processing area. In this study, a novel tray-type magnetorheological polishing process using low-frequency alternating magnetic field excitation was developed to improve the efficiency of magnetorheological polishing for large surfaces and to make polishing magnetorheological cluster generate a cyclical fluctuation up and down, and then improve the cross-cutting effects of abrasives. With the developed excitation system, a large bowl-shaped varying magnetic field was generated in the working area, and the effects of current frequency, working gap, trough rotation speed, and workpiece rotation speed on the improvement rate of surface roughness and material removal rate were systematically investigated. A series of experiments were conducted on K9 glass specimens to verify the polishing performance. Experimental results show that the surface roughness of K9 glass was improved from 567.08 to 9.63 nm in 120 min.

High Efficiency Radial Passive Magnetic Bearing

2010 ◽  
Vol 164 ◽  
pp. 360-365 ◽  
Author(s):  
Krzysztof Falkowski ◽  
Maciej Henzel
Keyword(s):  
Magnetic Field ◽  
Permanent Magnets ◽  
High Efficiency ◽  
Magnetic Levitation ◽  
Magnetic Bearing ◽  
Air Gap ◽  
The Other ◽  
Experimental Setup ◽  
Halbach Array ◽  
The Magnetic Field

Passive magnetic bearing with Halbach array is presented in this paper. The array uses permanent magnets with radial and axial magnetization to augment the magnetic field on one side of the array and cancel it on the other side. The design of the bearing consists of ring-shaped magnets of 60x70 mm and 75x85 mm with different orientation of magnetization. The designed passive magnetic bearing has air gap of 2.5 mm, stiffness 129297 N/m and maximal value of load 200 N. The bearing ensures magnetic levitation and stabilization of rotor in a work point. The paper presents the design of the passive magnetic bearing as well as the experimental setup together with investigation results.

The Function of Magnetic Field in a Magnetic-Electrochemical Compound Polishing

2010 ◽  
Vol 97-101 ◽  
pp. 4141-4145 ◽  
Author(s):  
Li Min Shi ◽  
Er Liang Liu ◽  
Yong Jiang Niu ◽  
Yu Quan Chen
Keyword(s):  
Magnetic Field ◽  
Mathematical Model ◽  
Concentration Polarization ◽  
Electrochemical Reaction ◽  
Charged Particles ◽  
Polishing Process ◽  
Electrical Field ◽  
Movement Model ◽  
The Mathematical Model ◽  
The Magnetic Field

Traditionally, the magnetic field is always vertical to the electrical field in a magnetic-electrochemical compound polishing.The magnetic field is set to parallel the electrical field in this paper. The mathematical model of the charged particles movement in a magnetic field is established through the analysis of its movement process when using Coulomb laws and Lorentz force. Through constructing the velocity formulation and loci formulation, the function of the magnetic field is proved. Because of the magnetic field, the concentration polarization of electrochemical reaction can be reduced more and the electrochemical reaction can be accelerated easily than the traditional polishing in which the magnetic field is vertical to the electrical field. Finally, to verify the model, the magnetic-electrochemical compound polishing process has been tested and the results, compared with those obtained from the model, have shown the movement model is reasonable and the analysis to function of magnetic field is correct.

Permanent Magnet Heater for Special Applications

2015 ◽  
Vol 792 ◽  
pp. 476-481
Author(s):  
Michele Forzan ◽  
Fabrizio Dughiero
Keyword(s):  
Magnetic Field ◽  
Rare Earth ◽  
Induction Heating ◽  
Permanent Magnets ◽  
Lower Cost ◽  
High Efficiency ◽  
Mechanical Design ◽  
Fixed Position ◽  
Dc Magnetic Field ◽  
Research Activities

This paper presents a review of the research activities carried out at the Laboratory for Electroheat of Padova University (LEP) in the field of high efficiency through heating of aluminum workpieces. Induction heating obtained by rotating a billet in a DC magnetic field produced by superconductive coils was the first attempt to reach high electrical efficiency in mass heating of high conductive metals, like aluminum, copper and brass. More recently, the same concept has been applied by rotating rare earth permanent magnets around a metal billet kept in a fixed position. This technology appears much more promising because of lower cost of installation and a more robust mechanical design.

A New High-Efficiency and Low-Damage Polishing Process of HgCdTe Wafer

2012 ◽  
Vol 27 (2) ◽  
pp. 229-232
Author(s):  
Yan Li ◽  
Jie Wanqi ◽  
Hang Gao ◽  
Renke Kang
Keyword(s):  
High Efficiency ◽  
Polishing Process
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