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.

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.

Investigation on the Improvement of Surface Quality by the Magnetic Plate-Assisted Magnetic Abrasive Finishing Process

2021 ◽  
Vol 1018 ◽  
pp. 111-116
Author(s):  
Yan Hua Zou ◽  
Hui Jun Xie
Keyword(s):  
Magnetic Field ◽  
Surface Quality ◽  
Field Distribution ◽  
Magnetic Field Distribution ◽  
Magnetic Flux Density ◽  
Magnetic Pole ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Finishing ◽  
Glass Lens ◽  
The Magnetic Field

The traditional magnetic abrasive finishing (MAF) process, the magnetic flux density at the bottom of the magnetic pole is unevenly distributed, resulting in poor uniformity of the finished surface. Therefore, it is proposed to improve the surface quality by attaching a magnetic plate at the bottom of the workpiece to improve the magnetic field distribution. It is confirmed by simulation that the magnetic field distribution at the bottom of the magnetic pole is effectively improved after the magnetic plate is attached. It is proved through experiments that the magnetic plate-assisted MAF process can obtain a smoother surface. The experimental results show that the surface roughness of the glass lens improves from 246 nm Ra to 3 nm Ra through the magnetic plate-assisted MAF process within 45min.

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.

Factors Affecting the Finishing Characteristics of an Internal Magnetic Abrasive Finishing Process for High Purity Fittings

2004 ◽  
Author(s):  
Hitomi Yamaguchi ◽  
Takeo Shinmura ◽  
Megumi Sekine
Keyword(s):  
Magnetic Field ◽  
High Purity ◽  
Target Surface ◽  
Magnetic Abrasive Finishing ◽  
Factors Affecting ◽  
Shaped Tube ◽  
Finishing Process ◽  
Abrasive Finishing ◽  
Abrasive Behavior ◽  
The Magnetic Field

In the case of internal finishing of the bent section of a complex shaped tube, such as found in high purity fittings, by a magnetic abrasive finishing process, the magnetic field at the finishing area and, therefore, the finishing force are hardly uniform over the entire finishing area due to the geometry. This affects the abrasive behavior against the inner surface of the bent section, changing the finishing characteristics of SUS304 stainless steel fittings. In practice, non-uniformities in the surface finish remain at the bent section between the inside, outside, and lateral regions. This unevenness combines to cause difficulties in achieving uniform finishing. Magnetic abrasive is generally supplied with ferrous particles, and the ferrous particles experience greater magnetic force and play a role in pressing the magnetic abrasive against the target surface. This paper studies the finishing mechanism in view of the relationship between the magnetic field, the ferrous particles mixed with magnetic abrasive, and the finishing characteristics. The experiments identify the finishing conditions required for successfully diminishing the non-uniformity in the finished surface, and methods are recommended to satisfy the required conditions. The experiments using the proposed methods show the feasibility of producing a uniformly finished mirror surface.

Uniform Internal Finishing of SUS304 Stainless Steel Bent Tube Using a Magnetic Abrasive Finishing Process

2004 ◽  
Vol 127 (3) ◽  
pp. 605-611 ◽  
Author(s):  
Hitomi Yamaguchi ◽  
Takeo Shinmura ◽  
Megumi Sekine
Keyword(s):  
Magnetic Field ◽  
Stainless Steel ◽  
Removal Rate ◽  
Surface Finishing ◽  
Initial Surface ◽  
Magnetic Abrasive Finishing ◽  
Sus304 Stainless Steel ◽  
Finishing Process ◽  
Abrasive Finishing ◽  
The Magnetic Field

This research studies the factors affecting the conditions required for successful uniform internal finishing of SUS304 stainless steel bent tube by a Magnetic abrasive finishing process. In particular, the effects of the magnetic field and ferrous particles were investigated. Local intensification of the magnetic field is accomplished by offsetting the axis of pole rotation from elbow axis. This effect enables local control of the material removal rate, which leads to uniformity in the finished surface regardless of the initial surface conditions. A two-phase finishing process controlling the size of the ferrous particles is proposed to achieve efficient fine surface finishing.

scholarly journals The idea of measuring the real induction in the machining gap filled with magnetic material

2019 ◽  
Vol 91 (6) ◽  
pp. 22-28
Author(s):  
Michał Marczak ◽  
Adrian Kopytowski ◽  
Rafał Nowicki ◽  
Grigor Stambolov
Keyword(s):  
Magnetic Field ◽  
Magnetic Induction ◽  
Magnetic Flux Density ◽  
Magnetic Abrasive Finishing ◽  
The Real ◽  
Abrasive Grains ◽  
Abrasive Finishing ◽  
Measurement Methodology ◽  
Real Value ◽  
The Magnetic Field

The article presents the characteristics of the distribution of magnetic flux density inside the machining gap in the magnetic abrasive finishing (MAF). Based on the analysis of the magnetic field in the empty gap and the distribution of forces in the magnetic circuit, the concept of measuring the real value of magnetic induction in a flexible abrasive tool formed in an external magnetic field was proposed. An indirect way of determining the magnetic induction has been described, which has a significant influence on the force acting on abrasive grains in the process of magnetic abrasive finishing. The advantages and the problems of the applied approach as well as the measurement methodology based on the change in the attraction force of the magnetic field elements as a result of the change in the concentration of abrasive grains and the width of the machining gap are presented.

Study of Magnetic Abrasive Finishing to Thin Sleeve of Al Alloy

2009 ◽  
Vol 407-408 ◽  
pp. 565-568 ◽  
Author(s):  
Hong Ling Chen ◽  
Wen Hui Li ◽  
Shi Chun Yang
Keyword(s):  
Magnetic Field ◽  
Field Experiments ◽  
Al Alloy ◽  
Improve Quality ◽  
Magnetic Abrasive Finishing ◽  
Research Results ◽  
Working Space ◽  
Finishing Process ◽  
Abrasive Finishing ◽  
Technical Innovations

The magnetic abrasive finishing process of thin sleeve of Al alloy with different diameter is studied based on self-adaptive characteristics. Some technical innovations are done such as fixing smooth magnetic mandrel or slot magnetic mandrel and so on in the workpiece interior for improving the structure style of the working space and characteristic of magnetic field. Experiments on thin sleeve of Al alloy are done and their finishing effects are contrasted. Research results indicate that fixing slot magnetic spindle in the workpiece interior can increase efficiency and improve quality for large thin non-magnetic sleeve.

Analysis of Surface Roughness and Surface Texture Generated by Pulsating Flexible Magnetic Abrasive Brush (P-FMAB)

2005 ◽  
Author(s):  
D. K. Singh ◽  
V. K. Jain ◽  
V. Raghuram ◽  
R. Komanduri
Keyword(s):  
Surface Roughness ◽  
Surface Texture ◽  
Pulsed Power ◽  
Workpiece Surface ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Finishing ◽  
Abrasive Cutting ◽  
Off Time ◽  
Flexible Magnetic Abrasive Brush ◽  
The Magnetic Field

The direct current magnetic abrasive finishing (DC-MAF) process provides practically no stirring effect on the static flexible magnetic abrasive brush (FMAB) formed by the magnetic field in the working gap. Absence of stirring leads to dullness of abrasive cutting edges in contact with the workpiece which results in a low finishing rate. To overcome this problem, the FMAB has been made pulsating using a DC-pulsed power supply, and the process is hence termed pulsed current-magnetic abrasive finishing (PC-MAF). The surface roughness was found to improve remarkably by the formation and destruction of the FMAB during the on and off time respectively, under selected pulsed parameters. The surface texture indicates that the process consists of microscratches generated on the finished surface. Further, the surface appears to have been generated by the removal of material from peaks of the workpiece surface by rotation as well as lateral movement of the FMAB.

The Design and Simulation of the Magnetic Field Formation Components Based on the Technology of Electro Permanent Magnet

2013 ◽  
Vol 579-580 ◽  
pp. 781-786
Author(s):  
Sheng Qiang Yang ◽  
Wen Hui Li ◽  
Hong Ling Chen ◽  
Jin Yu Guo
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Design Method ◽  
Surface Finishing ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Finishing ◽  
Important Position ◽  
Magnetic Filed ◽  
Field Formation ◽  
The Magnetic Field

As a typical kind of surface finishing technology, magnetic abrasive finishing has unique advantages in finishing effect, efficiency and application, it occupies a very important position and has huge potential application value. As the core component of the magnetic abrasive finishing, the magnetic field formation components have a direct impact on the finishing effect and efficiency. Electro permanent magnetic field formation components used in magnetic abrasive finishing are put forward based on the characteristics of electro permanent magnet and its application in crane and clutch. Analyzing the main performance and characteristics of the magnetic filed formation components and determining the overall scheme according to the total requirements of magnetic filed formation components. Analyzing the feasibility of the electro permanent magnetic filed formation components through the simulation and then forming the design method to further promote the industrialization process of magnetic abrasive finishing.

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.

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