scholarly journals New Magnetic Abrasive Finishing for Alumina Ceramic Plane Using Alternating Magnetic Fields

2019 ◽  
Vol 13 (6) ◽  
pp. 775-779
Author(s):  
Chaowen Dong ◽  
◽  
Yanhua Zou
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Diamond Particle ◽  
Alumina Ceramic ◽  
Alternating Magnetic Field ◽  
New Method ◽  
Magnetic Abrasive Finishing ◽  
Multi Stage ◽  
Abrasive Finishing ◽  
Alternating Magnetic Fields

In this paper, we propose a new plane magnetic abrasive finishing method, applicable to planes, that uses the alternating magnetic fields to solve problems such as the easy deformation and poor recovery of a magnetic brush in conventional magnetic abrasive finishing method. Compared with the magnetic brush used in conventional magnetic abrasive finishing, that in the new method can stably shape a workpiece under an alternating magnetic field. To determine the optimal finishing parameters, we focused on studying the effects of spindle rotational speed, size of diamond particle, and frequency of alternating magnetic field on the finishing surface. Then, according to the obtained optimal finishing parameters, multi-stage finishing experiments were performed with the new method. The results show that surface roughness can be improved from 230 nm Ra to 19 nm Ra in 60 min with the proposed method.

scholarly journals Investigation on Finishing Characteristics of Magnetic Abrasive Finishing Process Using an Alternating Magnetic Field

Machines ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 75
Author(s):  
Huijun Xie ◽  
Yanhua Zou
Keyword(s):  
Magnetic Field ◽  
Magnetic Particles ◽  
Alternating Magnetic Field ◽  
Surface Finishing ◽  
Magnetic Cluster ◽  
Magnetic Abrasive Finishing ◽  
Square Wave ◽  
Finishing Process ◽  
Abrasive Finishing ◽  
The Difference

The magnetic abrasive finishing (MAF) process is an ultra-precision surface finishing process. In order to further improve the finishing efficiency and surface quality, the MAF process using an alternating magnetic field was proposed in the previous research, and it was proven that the alternating magnetic field has advantages compared with the static magnetic field. In order to further develop the process, this study investigated the effect on finishing characteristics when the alternating current waveform is a square wave. The difference between the fluctuation behavior of the magnetic cluster in two alternating magnetic fields (sine wave and square wave) is observed and analyzed. Through analysis, it can be concluded that the use of a square wave can make the magnetic cluster fluctuate faster, and as the size of the magnetic particles decreases, the difference between the magnetic cluster fluctuation speed of the two waveforms is greater. The experimental results show that the surface roughness of SUS304 stainless steel plate improves from 328 nm Ra to 14 nm Ra within 40 min.

scholarly journals The loss of energy in metal plates of finite thickness, due to eddy currents produced by alternating magnetic fields

1926 ◽  
Vol 111 (759) ◽  
pp. 604-614 ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Eddy Currents ◽  
Finite Thickness ◽  
Metal Plate ◽  
The Self ◽  
Alternating Magnetic Field ◽  
Metal Plates ◽  
Alternating Magnetic Fields

The induction of eddy currents in metal plates which are subjected to alternating magnetic fields has been discussed by Clerk-Maxwell, J. J. Thomson and many others. When an alternating magnetic field is produced normal to the surface of a metal plate, eddy currents are induced at the surface of the plate, which gradually penetrate its interior, the current dying away as it penetrates more deeply into the metal. The diffusion of the currents into the plate depends upon the self-induction and resistance of the paths along which they flow, and can be calculated by the same kind of formula as is used for determining the conduction of heat through a metal slab.

scholarly journals The Effect of Extremely Low Frequency Alternating Magnetic Field on the Behavior of Animals in the Presence of the Geomagnetic Field

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Natalia A. Belova ◽  
Daniel Acosta-Avalos
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Geomagnetic Field ◽  
Low Frequency ◽  
Alternating Magnetic Field ◽  
Magnetic Alignment ◽  
Resonance Model ◽  
Transduction Mechanisms ◽  
Alternating Magnetic Fields ◽  
The Magnetic Field

It is known that the geomagnetic field can influence animal migration and homing. The magnetic field detection by animals is known as magnetoreception and it is possible due to two different transduction mechanisms: the first one through magnetic nanoparticles able to respond to the geomagnetic field and the second one through chemical reactions influenced by magnetic fields. Another behavior is the magnetic alignment where animals align their bodies to the geomagnetic field. It has been observed that magnetic alignment of cattle can be disrupted near electric power lines around the world. Experimentally, it is known that alternating magnetic fields can influence living beings, but the exact mechanism is unknown. The parametric resonance model proposes a mechanism to explain that effect on living beings and establishes that, in the presence of a constant magnetic field, molecules associated with biochemical reactions inside cells can absorb resonantly alternating magnetic fields with specific frequencies. In the present paper, a review is made about animal magnetoreception and the effects of alternating magnetic fields in living beings. It is suggested how alternating magnetic fields can interfere in the magnetic alignment of animals and a general conclusion is obtained: alternating magnetic field pollution can affect the magnetic sensibility of animals.

Study on an Ultra-Precision Plane Magnetic Abrasive Finishing Process by Use of Alternating Magnetic Field

2013 ◽  
Vol 395-396 ◽  
pp. 985-989 ◽  
Author(s):  
Jin Zhong Wu ◽  
Yan Hua Zou
Keyword(s):  
Magnetic Field ◽  
Magnetic Particles ◽  
Water Soluble ◽  
Alternating Magnetic Field ◽  
Magnetic Flux Density ◽  
Magnetic Abrasive Finishing ◽  
Finishing Process ◽  
Abrasive Finishing ◽  
Ultra Precision ◽  
Surface Precision

In this paper, a new plane magnetic abrasive finishing process by using alternating magnetic field is proposed to improve the efficiency and surface precision. In alternating magnetic field, the forced direction of magnetic particles is changing. Therefore, magnetic particles could produce the up and down movement, which promote the scatter of magnetic particles , improve the roll of abrasive particles and enhance the utilization of abrasive. In order to know well the magnetic intensity distribution in processing area, measured the magnetic flux density. Finishing force is important to understand the mechanism of material removal, investigated to the finishing force and contrasted to the movement changes of magnetic particles in water-soluble finishing fluid and oily finishing fluid. A set of experimental devices have been designed to realize surface polishing on C2801 brass plate, the results proved the feasibility of this method, which can improve the workpiece surface quality.

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