Study on a New Kind of Magnetic Abrasive Finishing by Using Alternating Magnetic Field for Ultra-Precision Plane Finishing

2020 ◽  
Vol 977 ◽  
pp. 42-49
Author(s):  
Chao Wen Dong ◽  
Yan Hua Zou ◽  
Hui Jun Xie
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
Magnetic Particles ◽  
Plane Surface ◽  
Alternating Magnetic Field ◽  
Magnetic Abrasive Finishing ◽  
Ac Power ◽  
Abrasive Finishing ◽  
Ultra Precision ◽  
Stable Shape

In this study, a new plane magnetic abrasive finishing method by using alternating magnetic field has been proposed to solve the problems such as the easy deformation and poorly restored of the magnetic brush in traditional magnetic abrasive finishing. Compared with the magnetic brush in traditional magnetic abrasive finishing, the magnetic brush can keep a relatively stable shape to finish the workpiece under the action of alternating magnetic field. In this paper, the variation of the finishing force in the alternating magnetic field is analyzed theoretically. In addition, in order to get the ultra-precision plane surface, the influence of the size of the magnetic particles, the size of the GC particles, and the frequency of the AC power on the finishing characteristics has been studied. The best experimental results show that the surface roughness of the workpiece is improved from 38 nm Ra to 6.33 nm Ra.

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.

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 Evaluation of Parameters Affecting Magnetic Abrasive Finishing on Concave Freeform Surface of Al Alloy via RSM Method

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Mehrdad Vahdati ◽  
SeyedAlireza Rasouli
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
Freeform Surface ◽  
Al Alloy ◽  
Regression Equations ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Finishing ◽  
The Impact ◽  
Abrasive Process ◽  
The Magnetic Field

The attempts of researchers in industries to obtain accurate and high quality surfaces led to the invention of new methods of finishing. Magnetic abrasive finishing (MAF) is a relatively new type of finishing in which the magnetic field is used to control the abrasive tools. Applications such as the surface of molds are ones of the parts which require very high surface smoothness. Usually this type of parts has freeform surface. In this study, the effect of magnetic abrasive process parameters on freeform surfaces of parts made of aluminum is examined. This method is obtained through combination of magnetic abrasive process and Control Numerical Computer (CNC). The use of simple hemisphere for installation on the flat area of the magnets as well as magnets’ spark in curve form is a measure done during testing the experiments. The design of experiments is based on response surface methodology. The gap, the rotational speed of the spindle, and the feed rate are found influential and regression equations governing the process are also determined. The impact of intensity of the magnetic field is obtained using the finite element software of Maxwell. Results show that in concave areas of the surface, generally speaking, the surface roughness decreases to 0.2 μm from its initial 1.3 μm roughness. However, in some points the lowest surface roughness of 0.08 μm was measured.

Surface texture improvement of magnetic and non magnetic materials using magnetic abrasive finishing process

2020 ◽  
pp. 095440622097059
Author(s):  
Kamepalli Anjaneyulu ◽  
Gudipadu Venkatesh
Keyword(s):  
Surface Roughness ◽  
Surface Finish ◽  
Surface Texture ◽  
Magnetic Particles ◽  
Supply Voltage ◽  
Initial Surface ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Finishing ◽  
Change In Mean ◽  
Al 2024

The present study focused on surface texture characteristics of magnetic material, Mild steel (MS) as well as nonmagnetic material, Aluminum 2024 (Al 2024) alloy with the application of a laboratory-developed magnetic abrasive finishing (MAF) process. MAF is one of the unconventional finishing processes to attain a satisfactory finishing level up to nanoscale. In MAF, the surface finish is controlled by a flexible magnetic abrasive brush (FMAB) which has a combination of abrasives (Al2O3, SiC, etc.) and magnetic particles (iron powder). The experiments were planned using (L27) full factorial design, different levels of weight percentage of abrasives (20–30%), speed of the electromagnet (180–2100rpm), and electromagnet supply voltage (30–50 V) were varied to enhance the surface responses. The responses considered were % improvements of change in the surface finish (%ΔRa), change in average peak to valley height (%ΔRz), change in total profile height (%ΔRt), and change in mean square root surface finish (%ΔRq). Analysis of variances (ANOVA) was evaluated and discussed. It is observed that the speed of the electromagnet and voltage are the most influencing variable parameters that most impacted on the responses. Surface roughness was measured before and after the MAF processing of MS and Al 2024 using a Suftronic S-100 surface roughness tester. The obtained surface morphology was examined by Scanning Electron Microscopy (SEM). It was observed that MS has %ΔRa = 83, %ΔRz = 65, %ΔRt = 65.5 and %ΔRq = 72.6 while Al 2024 has %ΔRa = 65, %ΔRz =50, %ΔRt = 51 and %ΔRq = 55 with noticeable surface texture improvement compared to the initial surface roughness obtained using surface grinding process.

MAGNETIC ABRASIVE FINISHING PROCESS — A PARAMETRIC ANALYSIS

2005 ◽  
Vol 04 (02) ◽  
pp. 131-150 ◽  
Author(s):  
S. C. JAYSWAL ◽  
V. K. JAIN ◽  
P. M. DIXIT
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
Finite Element ◽  
Flux Density ◽  
Surface Quality ◽  
Real Life ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Particles ◽  
Abrasive Finishing ◽  
The Magnetic Field

Magnetic Abrasive Finishing (MAF) is one of the non-conventional finishing processes, which produces a high level of surface quality and is primarily controlled by magnetic field. In MAF, workpiece is kept between the two poles (N and S) of a magnet. The working gap between the workpiece and the magnet is filled with magnetic abrasive particles. A magnetic abrasive flexible brush (MAFB) is formed, acting as a multipoint cutting tool, due to the effect of magnetic field in the working gap. This paper deals with theoretical investigations of the plane MAF process to know the effect of the process parameters on the surface quality produced. The magnetic field is simulated using finite element model of the process. The magnetic field is also measured experimentally to validate the theoretical results. A series of numerical experiments are performed using the finite element and surface roughness models of the process to study the effect of flux density, height of working gap, size of magnetic abrasive particles and slots (size and location) in the magnetic pole on the surface quality. Based on the results, it is concluded that surface roughness value (R max ) of the workpiece decreases with increase in flux density and size of magnetic abrasive particles. Surface roughness value (R max ) decreases with decrease in working gap. R max value also decreases when the magnet has a slot as compared to the magnet having no slot. Present study would help in understanding the effect of the various parameters on surface roughness value without doing a number of real-life experiments.

scholarly journals Development of a New Ultra-High-Precision Magnetic Abrasive Finishing for Wire Material Using a Rotating Magnetic Field

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 312 ◽  
Author(s):  
Lida Heng ◽  
Cheng Yin ◽  
Seok Han ◽  
Jun Song ◽  
Sang Mun
Keyword(s):  
Magnetic Field ◽  
Surface Roughness ◽  
High Precision ◽  
Rotational Speed ◽  
Steel Wire ◽  
Rotating Magnetic Field ◽  
Magnetic Abrasive Finishing ◽  
Wire Material ◽  
Finishing Process ◽  
Abrasive Finishing

In this paper, we propose a new ultra-high-precision magnetic abrasive finishing method for wire material which is considered to be difficult with the existing finishing process. The processing method uses a rotating magnetic field system with unbonded magnetic abrasive type. It is believed that this process can efficiently perform the ultra-high-precision finishing for producing a smooth surface finish and removing a diameter of wire material. For such a processing improvement, the following parameters are considered; rotational speed of rotating magnetic field, vibration frequency of wire material, and unbonded magnetic abrasive grain size. In order to evaluate the performance of the new finishing process for the wire material, the American Iron and Steel Institute (AISI) 1085 steel wire was used as the wire workpiece. The experimental results showed that the original surface roughness of AISI 1085 steel wire was enhanced from 0.25 µm to 0.02 µm for 60 s at 800 rpm of rotational speed. Also, the performance of the removed diameter was excellent. As the result, a new ultra-high-precision magnetic abrasive finishing using a rotating magnetic field with unbonded magnetic abrasive type could be successfully adopted for improving the surface roughness and removing the diameter of AISI 1085 steel wire material.

Sign in / Sign up

Export Citation Format

Share Document