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1
Patil, Mahadev Gouda, Kamlesh Chandra i P. S. Misra. "Study of Magnetic Abrasive Finishing Using Mechanically Alloyed Magnetic Abrasives". Advanced Materials Research 585 (listopad 2012): 517–21. http://dx.doi.org/10.4028/www.scientific.net/amr.585.517.
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The finishing characteristics of mechanically alloyed magnetic abrasives used in cylindrical magnetic abrasive finishing (MAF) are presented in this study. Mechanical alloying is a solid state powder processing technique, where the powder particles are subjected to impact by the balls in a high energy ball mill or attritor at room temperature. After the process, fine magnetic abrasives are obtained in which the abrasive particles are attached to the base metal matrix without any bonding material. The magnetic particle used in the magnetic abrasive production is iron powder and the abrasive is aluminium oxide. Magnetic abrasives play the role of cutting tools in MAF, which is emerging as an important non-conventional machining process. The experiments performed on stainless steel tubes examine the effects of varying the quantity of magnetic abrasives, magnetic flux density, speed of rotation of the workpiece and amount of lubricant. The surface roughness measurements demonstrate the effects of the abrasive behaviour on the surface modification. The surface roughness was analysed in terms of percentage improvement in surface finish (PISF). The obtained maximum PISF was 40 % and the minimum surface roughness was 0.63 μm Ra.
2
Zhao, Xuefeng, Hao Qin, Yong Yang, Ke You, Xiaolong Yin i Yin Yuan. "Study on magnetic preparation of dual disk based on silica gel magneto-elastic abrasive particles". Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 39, nr 6 (grudzień 2021): 1304–11. http://dx.doi.org/10.1051/jnwpu/20213961304.
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Magneto-elastic abrasive grains have magnetism, low elastic modulus and excellent abrasive performance, and have the characteristics of bonded abrasive grains and loose abrasive grains. The dual-disk magnetic preparation greatly improves the preparation quality and efficiency. Firstly, the magneto-elastic abrasive particles are introduced into the edge preparation of the dual-disk magnetic tool, and the preparation method of 4035 silica gel magneto-elastic abrasive particles is proposed. According to the microscopic characteristics of the magneto-elastic abrasive particles, the finite element software ABAQUS is used to establish the magneto-elastic abrasive particles. The meso-level representative volume element (RVE) model is built to analyze the stress and strain law of magneto-elastic abrasive particles under tension and compression. Secondly, an experimental platform for magnetic preparation of magneto-elastic abrasive particles with dual disks was built to analyze the force of magneto-elastic abrasive particles. Finally, Through the magnetic preparation experiment of the magneto-elastic abrasive dual-disk magnetic force, the influence of the disk rotation speed, abrasive particle size and relative magnetic permeability on the cutting edge wear is studied. And compared to the magnetic abrasive particles double-disk magnetic and drag finishing method, the magneto-elastic abrasive particle double-disk magnetic preparation method can obtain the maximum edge wear amount and the maximum surface roughness decreasing amplitude. The research results are of great significance to promote the progress of our country's magnetic high-efficiency processing and magneto-finishing processing technology.
3
Li, Wei Dong, Ming Lv i Hong Zhang. "The Role of Nanometer Silicon Dioxide in the Modification of Fluid Magnetic Abrasive". Materials Science Forum 694 (lipiec 2011): 229–33. http://dx.doi.org/10.4028/www.scientific.net/msf.694.229.
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The fluid magnetic abrasive (FMA) is a new type of precision finishing abrasives which is a sort of suspended fluid composed by magnetic particles, nonmagnetic abrasive particles, surfactants in a non-magnetizable carrier liquid. This paper is to solve the contradiction of disperser stability by adding the surface active agent (dispersing agent), the nano- particles etc.
4
Chen, Yan, M. M. Zhang i Z. Q. Liu. "Study on Sintering Process of Magnetic Abrasive Particles". Advanced Materials Research 337 (wrzesień 2011): 163–67. http://dx.doi.org/10.4028/www.scientific.net/amr.337.163.
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The magnetic abrasive prepared by sintering method, the aim is to change the internal structure of abrasive particles by sintering method, make the abrasive particles parceled on the surface of magnetic iron particles, and compared with the abrasive particles phase to get a kind of magnetic abrasive particles with high durability, strong magnetic, which can be magnetized in a magnetic field and improve processing efficiency and surface quality in magnetic abrasive machining. Sintering is used to prepare magnetic abrasive in this paper, to make iron particles, abrasive particles mixed with some binder, after suppression, drying, sintering, cooling, crushing and screening. This paper makes analysis for surface morphology and composition of the magnetic abrasive particles by scanning electron microscopy and discusses the effect that the abrasive particles size ratio, sintering time, sintering temperature on the magnetic abrasive, and the preparation of the magnetic abrasive process has been optimized.
5
Chen, Yan, Yan Jun Li, Yao Ming Zhang i Xu Zhang. "Study on Preparation Process of Magnetic Abrasive Particles". Materials Science Forum 750 (marzec 2013): 7–10. http://dx.doi.org/10.4028/www.scientific.net/msf.750.7.
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Abstract: With the industrial development and improvement of mechanical product quality, the demand of part surface quality and accuracy gets more and more high. As some parts of complex shape, can’t be machined by the traditional processing technology, therefore, the magnetic abrasive technique was proposed. The magnetic abrasive particles play an important role in the magnetic abrasive finishing, it use strong magnetic iron particles and abrasive particles mixed together (called magnetic abrasive). The prepared method of magnetic abrasive one of is sintering method, the aim is to change the internal structure of abrasive particles, make the abrasive particles is distributed on the surface of magnetic iron particles, get a kind of magnetic abrasive, which can be magnetized in a magnetic field and improve processing efficiency and surface quality in magnetic abrasive finishing. In this paper, sintering method is used to make iron particles, abrasive particles mixed with some binder, after suppression, drying, sintering, cooling, break up and sieving, analysis surface morphology and composition of the magnetic abrasive particles by scanning electron microscopy, discusses the effect of the abrasive particles size ratio, sintering time, sintering temperature for the finishing performs, the preparation process of the magnetic abrasive has been optimized, work out the standard of preparation of the magnetic abrasive process
6
Liao, G. B., M. M. Zhang, Y. J. Li, Z. Q. Liu i Yan Chen. "Research on Tests of Magnetic Abrasive Finishing by Sintering Method". Key Engineering Materials 487 (lipiec 2011): 273–77. http://dx.doi.org/10.4028/www.scientific.net/kem.487.273.
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This paper mainly illustrates the magnetic abrasive finishing by sintering method and research on tests of magnetic abrasive finishing, analyses the effect of the sintering temperature, ratio of magnetic and abrasive particle size, sintering time and sintering characteristics of magnetic particles on magnetic abrasive during the finishing process, so as to achieve a better process and principle for magnetic abrasive finishing.
7
Yu, Juan, Qiu Sheng Yan, Jia Bin Lu i Wei Qiang Gao. "Research on Material Removal of a New Micro Machining Technology Based on the Magnetorheological Effect of Abrasive Slurry". Key Engineering Materials 364-366 (grudzień 2007): 914–19. http://dx.doi.org/10.4028/www.scientific.net/kem.364-366.914.
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Based on the magnetorheological (MR) effect of abrasive slurry, the particle-dispersed MR fluid is used as a special instantaneous bond to cohere abrasive particles and magnetic particles so as to form a dynamic, flexible tiny-grinding wheel to polish optical glass, ceramic and other brittle materials of millimeter or sub-millimeter scale with a high efficiency. Experiments were conducted to reveal the effects of different process parameters, such as grain sizes of abrasive particles, machining time, machining gap between the workpiece and the rotation tool, and rotation speed of the tool, on material removal rate of glass surface. The results indicate the following conclusions: material removal rate increases when the grain size of abrasives is similar to that of magnetic particles; machining time is directly proportional to material removal, but inversely proportional to material removal rate; machining gap is inversely proportional to material removal; polishing speed has both positive and negative influence on material removal rate, and greater material removal rate can be obtained at a certain rotation speed. In addition, the difference of the machining characteristics between this new method and the traditional fixed-abrasive machining method is analyzed.
8
Ido, Yasushi, Takaya Yamaguchi i Hitoshi Nishida. "Numerical Analysis of the Polishing Process of Inner Tube Wall Using Micron-Size Particles in Magnetic Fluids". Materials Science Forum 670 (grudzień 2010): 110–17. http://dx.doi.org/10.4028/www.scientific.net/msf.670.110.
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Distribution and behaviour of micron-size magnetic particles and nonmagnetic particles in magnetic fluids in the polishing process of inner wall of small tube is investigated numerically by using the particle method based on the simplified Stokes dynamics. In this study, it is shown that chain-like clusters of both magnetic particles and those of nonmagnetic abrasive particles are formed between the two magnetic poles. The clusters are strongly held during the polishing process. The clusters of the nonmagnetic abrasive particles are surrounding the clusters of magnetic particles and they are combined with each other.
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Li, W. D., Ming Lv i Sheng Qiang Yang. "Preliminary Research on the Post Treatment of Fluid Magnetic Abrasivetool". Key Engineering Materials 455 (grudzień 2010): 161–64. http://dx.doi.org/10.4028/www.scientific.net/kem.455.161.
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Fluid magnetic abrasivetool(FMA) is one kind of latest finishing abrasivetool which is a sort of suspended fluid composed by magnetic particles, nonmagnetic abrasive particles, surfactants in a non-magnetizable carrier liquid. After a period of working time, the performance-life of the abrasivetool ended because of the cutting- blade of the abrasives particles being passive. While the most costly component- the magnetic particles (carbonyl iron particles) can be reused. This paper has made up two recovery flows to separated carbonyl iron particles from others.
10
Yuan, Wei, Haotian Wang, Qianjian Guo, Wenhua Wang, Yuqi Zhu, Jie Yu i Xianhai Yang. "Study on Wear Mechanism of Helical Gear by Three-Body Abrasive Based on Impact Load". Materials 15, nr 12 (10.06.2022): 4135. http://dx.doi.org/10.3390/ma15124135.
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This study aimed to explore the wear characteristics and evolution mechanisms of large-scale wind power gears under the impact load of particles of the three-body abrasive Al2O3 (0.2 mg/mL) from four aspects: oil analysis, vibration analysis, amount of gear wear, and tooth-surface-wear profile analysis. A magnetic powder brake was used to simulate the actual working conditions. Combined with the abrasive particle monitoring and the morphology analysis of the tooth-surface-wear scar, by setting quantitative hard particles in the lubricating oil, the gears are mainly operated in the abrasive wear state, and wear monitoring and wear degree analysis are carried out for the whole life cycle of the gears. Oil samples were observed and qualitatively analyzed using a particle counter, a single ferrograph, a metallographic microscope, and a scanning electron microscope. The experiments demonstrate that the initial hard particles have a greater impact in the early wear stage of the gears (<20 h), and abrasive particle concentration increases by 30%. This means that Al2O3 particles accelerate the gear wear during the running-in period. The loading method of the impact load on the oblique gear exacerbates the abrasion particle wear and expands the stress concentration, which reduces the surface of large milling particles on the surface, and reduces the width of the tooth (the part above the pitch line is severely worn), which causes the gear to break into failure. The research provides help for analyzing the mechanism of abrasive wear of gears and predicting wear life.
11
Ido, Yasushi, Keisuke Asakura i Hitoshi Nishida. "Behavior of both Nonmagnetic Particles and Magnetic Particles in Magnetic Compound Fluids in a Micro-Tube with Axial Flow under Rotating Magnetic Field". Materials Science Forum 856 (maj 2016): 9–14. http://dx.doi.org/10.4028/www.scientific.net/msf.856.9.
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Behaviors of both micrometer-size nonmagnetic abrasive particles and micrometer-size magnetic particles in a magnetic fluid are investigated by using the discrete particle method which is based on the simplified Stokes dynamics. Sheet-like clusters of nonmagnetic particles and sheet-like clusters of magnetic particles alternately appear one after another in the axis direction when the flow velocity is small.
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Chen, H. L., Shi Chun Yang, Jian Mei Wang, Wen Hui Li i G. Y. Xiong. "Internal Magnetic Abrasive Particles Surface Finishing Based on Permanent Magnetic Field". Advanced Materials Research 53-54 (lipiec 2008): 65–68. http://dx.doi.org/10.4028/www.scientific.net/amr.53-54.65.
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To internal magnetic abrasive particles surface finishing, the motion of magnetic abrasive particles was influenced not only by the intensity of magnetic induction, but also by the internal diameter, and the magnetic inductive capacity was also an important factor that influences finishing quality. In this paper, under the same experimental conditions, electromagnetic field and permanent magnetic field were respectively used to magnetic abrasive particles surface finishing on thin stainless steel bush and 45 steel bush, new thoughts on inserted permanent magnetic pole and butted permanent magnetic pole were pointed out. The finishing quality of two kinds of work pieces under three different magnetic poles was compared. The results have shown that permanent magnetic pole could decrease the surface roughness Ra of work piece from 1.6μm to 0.2μm, which could solve the puzzles encountered in internal magnetic abrasive particles surface finishing on magnetic inductive work piece and had good promising application value.
13
Ahmadi, Farshid, Hassan Beiramlou i Pouria Yazdi. "Effect of abrasive particle morphology along with other influencing parameters in magnetic abrasive finishing process". Mechanics & Industry 22 (2021): 15. http://dx.doi.org/10.1051/meca/2021013.
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Surface characteristics play a very important role in medical implants and among surface features, surface roughness is very effective in some medical applications. Among the various methods used to improve surface roughness, magnetic abrasive finishing (MAF) process has been widely used in medical engineering. In this study, the effect of abrasive particle morphology along with four other process parameters, including type of work metal, finishing time, speed of finishing operation, and the type of abrasive powder were experimentally evaluated. Full factorial technique was used for design of experiment. Three commonly used metals in orthopedic implants i.e., Ti-6Al-4V alloy, AZ31 alloy and austenitic stainless-steel 316LVM, were selected for this study. Also, two types of magnetic abrasive particles with different shapes (spherical and rod-shaped) were considered in the experiments. The results of the experiments indicated that the morphology of the abrasive particles and the finishing time had the greatest effect on surface roughness and using rod-shaped abrasive particles resulted in better surface quality comparing to the spherical particles. Besides, the surface quality of steel 316LVM after MAF was the best among the other examined metals. Interaction plots of ANOVA also showed that interactions of material with morphology of abrasive particles, and material with machining time were found to be reasonably significant.
14
Singh, Palwinder, Lakhvir Singh i Arishu Kaushik. "Parametric Optimization of Magnetic Abrasive Finishing Using Adhesive Magnetic Abrasive Particles". International Journal of Surface Engineering and Interdisciplinary Materials Science 7, nr 2 (lipiec 2019): 34–47. http://dx.doi.org/10.4018/ijseims.2019070103.
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A very precise surface finish is desirable in manufacturing semiconductors, medical equipment, and aerospace parts. The examinations on magnetic abrasive finishing (MAF) processes are being done for the modern industry. This newly developed process is serving the industry to achieve the desired level of precision and surface finish. This research represents the MAF of aluminum pipes using adhesive magnetic abrasive particles. The different process parameters were optimized using the Response Surface Methodology (RSM) method to gain an in-depth analysis of surface roughness in terms of roughness improvement rate (RIR), and material removal rate (MRR). The achieved maximum RIR and MRR was 81.49% and 2.74mg/min, respectively. The finished workpieces were microscopically investigated by scanning electron microscopy (SEM) to further study the mechanism of MAF process.
15
Xu, Jia Ye, i Yan Hua Zou. "Study on Finishing of Polychlorotrifluoroethylene Resin by Magnetic Abrasive Finishing Process with Renewable Abrasive Particles". Solid State Phenomena 324 (20.09.2021): 72–77. http://dx.doi.org/10.4028/www.scientific.net/ssp.324.72.
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Polychlorotrifluoroethylene material is used in industry as a material with excellent insulation, impact resistance and acid and alkali resistance. In this study, we used a magnetic abrasive finishing process with renewable abrasive particles to finish the surface of the polychlorotrifluoroethylene resin plate. Magnetic Abrasive Finishing (MAF) process is a technology that uses flexible magnetic brushes to improve the surface quality of materials. The performance of the magnetic brush is a key factor in surface finishing. In conventional MAF finishing, the number of abrasive particles in the magnetic brush is limited, and the position of the abrasive particles is relatively fixed, which will cause the cutting edge of the abrasive particles to gradually become dull and the finishing efficiency gradually decreases. This paper research the characteristics of the MAF process with renewable abrasive particles. This MAF process has a circulating system that uses a conveyor belt to renew abrasive particles. We use the polychlorotrifluoroethylene resin plate as the experimental processing object to conducted finishing experiment. And the surface roughness of the polychlorotrifluoroethylene resin plate is improved from 315 nm to 32 nm through this process.
16
Lu, Jia Bin, Juan Yu, Qiu Sheng Yan, Wei Qiang Gao i Liang Chi Zhang. "A Novel Superfine Machining Technology Based on the Magnetorheological Effect of Abrasive Slurry". Materials Science Forum 532-533 (grudzień 2006): 145–48. http://dx.doi.org/10.4028/www.scientific.net/msf.532-533.145.
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Based on the magnetorheological (MR) effect of abrasive slurry, this paper presents an innovative superfine machining method. In this technique, the particle-dispersed MR fluid is used as a special instantaneous bond to cohere abrasive particles and magnetic particles so as to form a dynamical tiny-grinding wheel. This tiny-grinding wheel can be used to polish the surface of brittle materials in millimeter or sub-millimeter scale. The characteristics of the machined glass surfaces examined by the scanning electron microscope (SEM) and the Talysurf roughness tester confirmed the effectiveness of the finishing technique. The machined surface with convex center and concave fringe demonstrates that the material removal process is dominated by the synergy of the applied pressure and the relative velocity between the abrasives and workpiece. In the case of glass finishing, the mode of material removal is found to be plastic, and controlled by the abrasive-wear mechanism.
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Chen, Yan, Akira Shimamoto, X. Gao i M. M. Zhang. "Study of Friction Coefficient and Friction Force on Magnetic Abrasive Finishing". Materials Science Forum 675-677 (luty 2011): 663–66. http://dx.doi.org/10.4028/www.scientific.net/msf.675-677.663.
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In order to enhance grinding efficiency of the magnetic abrasive finishing (MAF) method, we usually use the sinter method or the cementation method to mix the magnetic particles and abrasive particles together. However, the cost is high, and the variety is incomplete. Therefore, with the ferromagnetism to iron particles, the alumina particles and the lipin three kind of material simple mixture participate in the magnetic abrasive finishing which directly polishes, already obtained the good effect through the experiment. This paper analyses and explains the characteristic of the friction coefficient and the friction force on magnetic abrasive finishing according as account and experiment data.
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Wang, A. Cheng, Lung Tsai, Chun Ho Liu i Yan Cherng Lin. "Improving the Polishing Effect of Stainless Tube by Magnetic Finishing with Gel Abrasive". Key Engineering Materials 656-657 (lipiec 2015): 289–95. http://dx.doi.org/10.4028/www.scientific.net/kem.656-657.289.
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Magnetic abrasive finishing (MAF) is a fast and high-precision polishing method. However, the magnetic force acting on abrasive particles will decrease remarkably when polishing stainless steel tubes with the property of non-permeability, such as the SUS304 stainless steel. Moreover, the abrasive particles will be moved off the surface of machining area due to the centrifugal force of rotation, resulting in reducing the stability of polishing process. Therefore, this study developed a novel approach by adopting different gels as the bonding materials to combine the magnetic abrasive particles with hard abrasive particles to create a series of magnetic abrasive gels. Generally, those abrasive gels have higher viscosity to dominate the flow property that will constrain uniform motion of the abrasive particles in MAF, and the abrasive gels can be tightly contacted to the wall surface to increase the stability of polishing. This investigation utilized the optimal parameters out of Taguchi method to polish SUS304 stainless steel tube for 30 minutes—the value of surface roughness can be reduced from 0.636μm Ra to 0.05μm Ra, which can be improved by 92.1%, and the amount of material remove rate is as high as 218.4mg.
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Chow, Han Ming, Lieh Dai Yang, Yuan Feng Chen, Yung Ho Huang i Yan Cherng Lin. "Development on Silicon Rubber Elastic Composite Magnetic Abrasive and Research on Internal Polishing". Applied Mechanics and Materials 620 (sierpień 2014): 472–75. http://dx.doi.org/10.4028/www.scientific.net/amm.620.472.
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With the use of Magnetic Abrasive Finishing (MAF) to polish surfaces of the parts, roughness on the surfaces can reach a level like a mirror. We have devoted to the study of MAF for many years; the magnetic abrasive particle we have developed can yield a value of Ra 0.008μm (Rmax0.1μm), which is similar to the surface of a mirror. However, there is no way to absorb charging of abrasive particle during polishing for conventional stiff abrasive materials. Therefore, it is difficult to obtain the nanolevel mirror surface. The study is based on silicon rubber and mix Sic and pure iron powder to develop elastic magnetic abrasive particles. During the process, employing the micro elastic of the polymer elastic magnetic abrasive particle to make the particle shape change and increase the contact area, therefore to improve the surface roughness by micro polishing to achieve a nanolevel mirror polishing demand。 The particle could be made easily in a short time, therefore it could reduce production cost and achieve environmental protection simultaneously.
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Hanada, Kotaro, i Hitomi Yamaguchi. "Development of Spherical Iron-Based Composite Powder with Carried Alumina Abrasive Grains by Plasma Spray". Advanced Materials Research 75 (czerwiec 2009): 43–46. http://dx.doi.org/10.4028/www.scientific.net/amr.75.43.
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This paper describes the development of spherical iron-based composite powder with carried alumina abrasive grains made by a plasma spray technique. Carbonyl iron powder (7.2 μm average size) and alumina abrasive grains (0.3 μm average size) are sprayed into the plasma flame from the respective nozzles simultaneously, or their mechanical mixture is directly plasma-sprayed. In case of the composite powder obtained by the direct spray method, the alumina abrasives are well carried on the carbonyl iron particles. However, a plasma current of more than 100 A causes melting and vaporizing of the alumina abrasives;, consequently the carbonyl iron and alumina abrasives are separated. The magnetic abrasive experiments with the composite powder developed are made for SUS304 stainless steel plate, and the result shows that the developed composite powder has high potential abrasive performance.
21
Wu, Jin Zhong, i Yan Hua Zou. "Study on an Ultra-Precision Plane Magnetic Abrasive Finishing Process by Use of Alternating Magnetic Field". Applied Mechanics and Materials 395-396 (wrzesień 2013): 985–89. http://dx.doi.org/10.4028/www.scientific.net/amm.395-396.985.
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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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Zou, Yan Hua, i Takeo Shinmura. "Development of a New Ultra-Precision Magnetic Abrasive Finishing Process". Key Engineering Materials 523-524 (listopad 2012): 256–61. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.256.
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To obtain an ultra-precision surface, this research developed a new type of magnetic finishing tool, “Ultra-precision Magnetic Abrasive Slurry”, for a magnetic field assisted internal finishing process. This ultra-precision magnetic abrasive slurry is made to mix simply the super-minute abrasive grains, super-minute globular iron particles, and oily grinding liquid. When the internal finishing was executed, the automatic mixing phenomenon of the Ultra-precision Magnetic Abrasive Slurry is caused, at the same time, super-minute abrasive grains and minute iron particles were uniformly distributed to the magnetic abrasive slurry. It was confirmed that a smooth mirror internal finishing for a SUS304 stainless steel tube is able to be achieved, by using the Ultra-precision Magnetic Abrasive Slurry that consists of the globular carbonyl iron particles (6μm in mean diameter) and diamond grains (0.25~0.75μm in mean diameter) and the oily grinding liquid. In this study, we examined the influence that the rotational speed of the magnetic pole exerted on the finishing characteristic. The results showed that the ultra-precision surface is successfully made, and the surface roughness has been improved from 320nm Ra to 3.37nm Ra .
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Zhang, Kaituo, i Zhiyong Lv. "Quantitative Measuring Analysis Method and Mechanism of Wear Particle Settlement". E3S Web of Conferences 252 (2021): 03037. http://dx.doi.org/10.1051/e3sconf/202125203037.
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The size and distribution of wear particle in lubricating oil, as important numerical information available in ferrography, is one of the key indexes in wear diagnosis. In this paper, a new method for measuring the size and distribution of abrasive particles is proposed. First, all the abrasive fluid is left standing until all the abrasive particles are precipitated to the bottom. Then, the measuring container is inverted and the whole precipitation process of abrasive particles is recorded by magnetic induction instrument. And according to the precipitation analysis of the wear particle, the following results were obtained:1) At the initial stage of the particle settlement, the gravity, the buoyancy and the drag force of the oil achieve balance quickly, the time and distance of the wear particle moving at a constant velocity can be neglected. 2) The settling velocity is related to the diameter and specific gravity of the wear particle as well as the specific gravity and viscosity of the oil, the distribution of the wear particle is proportional to the square of the diameter of the particle, using the magnetic induction technology, the distribution of particle can be measured by settling time for different sizes of wear particles. 3) Measure the wear particle oil directly, there are different sizes of particles settlement in the bottom at the same time, which causes the difficulty in identifying the size of the particle settlement. The particle should be settled first, and then inverted, settling the particle in accordance with the order from large to small, which facilitates the measurement of different sizes of the particles, different times correspond to different sizes of the particles. 4) The bigger the particle is, the more accurate the measurement and counting is, the smaller the particle is, the bigger the error is.
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Gill, Jagdeep Singh, i Lakhvir Singh. "OPTIMIZATION OF MAGNETIC ABRASIVE FINISHING PROCESS OF SS304 STAINLESS STEEL". International Journal of Modern Manufacturing Technologies 14, nr 1 (20.06.2022): 55–63. http://dx.doi.org/10.54684/ijmmt.2022.14.1.55.
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With the advancement of the high-end industry, the demand for smooth surfaces has grown at an exorbitant rate. Magnetic abrasive finishing (MAF) is gaining wide attention these days as a popular finishing method to achieve smooth and high-quality surfaces. An alternative approach was used in the present work to produce a highly finished surface on stainless steel SS304 sheet using a magnetic abrasive finishing process. Response surface methodology (RSM) was applied to optimize the process parameters. Optimal results occur at a magnetic flux density (3100 Gauss), the rotational speed of the magnetic pole (250 rpm), grit size (250µm), and the percentage of abrasive particles (10%) for a percentage reduction in surface roughness (%∇Ra). Among the four factors, the grit size of the abrasives is the factor with the highest contribution (42.70%) and the rotation speed of the magnetic pole is the factor with the least contribution (0.79%) during the finishing process of the magnetic abrasive, which affects the percentage reduction in surface roughness (%∇Ra). To acquire a better understanding of the finishing mechanism, scanning electron microscope (SEM) images and surface profiles of the surface before and after magnetic abrasive finishing were also examined.
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Zhao, Qun, Shunfan Xie, Hanxiao Wang, Luyao Yang, Xukun Mei i Yangang He. "Control of the Micro-Defects on the Surface of Silicon Wafer in Chemical Mechanical Polishing". ECS Journal of Solid State Science and Technology 11, nr 2 (1.02.2022): 023009. http://dx.doi.org/10.1149/2162-8777/ac546d.
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The final polishing of silicon results in the irresistible formation of micro-defects (i.e., particle residues and scratches) on the surface. In view of this problem, the synergistic effect of surfactants and water-soluble polymers in inhibiting the micro-defects on the silicon surface was studied in this paper to improve the wettability of the slurry and reduce the micro-flocculation of abrasive particles. The results showed that the total number of residual particles (≥0.06 μm) on the polished surface was reduced from 24,784 to 277 with the adsorption of cationic polyacrylamide (CPAM) and fatty alcohol polyoxyethylene ether (AEO-9). The water-soluble polyvinylpyrrolidone (PVP) polymer could coat on the SiO2 abrasives, inhibit the flocculation of abrasive particles, avoid scratches on the silicon surface and further reduce the number of residual particles (≥0.06 μm) to 67 on the polished surface. Furthermore, a contact angle analyzer was used to characterize the wettability of the components in the slurry, and a large particle counter was used to analyze the changes in the number of large particles in the slurry component. Finally, a mechanism of surfactants and a water-soluble polymer combined system was proposed to suppress the micro-defects on the surface of the silicon wafer.
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Park, Sung Jun, i Sang Jo Lee. "Fabrication of the Fine Magnetic Abrasives by Using Mechanical Alloying Process and its Polishing Characteristics". Key Engineering Materials 326-328 (grudzień 2006): 421–24. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.421.
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A new method to fabricate the fine magnetic abrasives by using mechanical alloying is proposed. The mechanical alloying process is a solid powder process where the powder particles are subjected to high energetic impact by the balls in a vial. As the powder particles in the vial are continuously impacted by the balls, cold welding between particles and fracturing of the particles take place repeatedly during the ball milling process using a planetary mill. After the manufacturing process, fine magnetic abrasives which the guest abrasive particles clung to the base metal matrix without bonding material can be obtained. The shape of the newly fabricated fine magnetic abrasives was investigated using SEM and its polishing performance was verified by experiment. It is very helpful to finishing the micro structures such as injection mold and MEMS applications in final polishing stage. The areal rms surface roughness of the workpiece after several polishing processes has decreased to a few nanometer scales.
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Song, Wanli, Zhen Peng, Peifan Li, Pei Shi i Seung-Bok Choi. "Annular Surface Micromachining of Titanium Tubes Using a Magnetorheological Polishing Technique". Micromachines 11, nr 3 (17.03.2020): 314. http://dx.doi.org/10.3390/mi11030314.
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In this study, a novel magnetorheological (MR) polishing device under a compound magnetic field is designed to achieve microlevel polishing of the titanium tubes. The polishing process is realized by combining the rotation motion of the tube and the reciprocating linear motion of the polishing head. Two types of excitation equipment for generating an appropriate compound magnetic field are outlined. A series of experiments are conducted to systematically investigate the effect of compound magnetic field strength, rotation speed, and type and concentration of abrasive particles on the polishing performance delivered by the designed device. The experiments were carried out through controlling variables. Before and after the experiment, the surface roughness in the polished area of the workpiece is measured, and the influence of the independent variable on the polishing effect is judged by a changing rule of surface roughness so as to obtain a better parameter about compound magnetic field strength, concentration of abrasive particles, etc. It is shown from experimental results that diamond abrasive particles are appropriate for fine finishing the internal surface of the titanium-alloy tube. It is also identified that the polishing performance is excellent at high magnetic field strength, fast rotation speed, and high abrasive-particle concentration.
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Vahdati, Mehrdad, E. Sadeghinia i Ali Shokuhfar. "Magnetic Assisted Abrasion, a New Method for Nano Level Surface Finishing". Defect and Diffusion Forum 297-301 (kwiecień 2010): 402–7. http://dx.doi.org/10.4028/www.scientific.net/ddf.297-301.402.
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A great deal of attention in manufacturing engineering has been focused on finishing operations of hard and brittle materials in recent years. This paper reports an experimental work on the analysis of surface roughness and material removal using design of experiment (DOE) method in magnetic abrasive finishing, (MAF) of flat surfaces. Change in surface roughness and material removal were found to increase with an increase in weight percentage of abrasive particles in magnetic abrasive brush, lubricant volume and decrease in working gap. Also, any decrease in the relative size of the abrasive particles vis-à-vis the iron particles would result into an increase of the surface roughness and decrease in material removal. It was observed that the work piece hardness had no considerable effect on the process results. The optimum parameter levels which lead into the best surface finish and highest material removal were also derived from these experimentations. Optimum levels included weight percentage of abrasive particles of 40%, Lubricant volume of 1 ml, working gap of 3 mm, relative size of abrasive particles vis-à-vis the iron particles of 0.22, and work piece hardness of 82-87 HBN. Disk type test pieces were selected from Al 7075 and their two side surfaces were under experiments. Experiments were made using a milling machine spindle as magnetic pole holder, and its table as fixture holder for work pieces.
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Samra, Partap Singh, i Lakhvir Singh. "Analyzing Effect of Interactions of Process Parameters on Surface Finish of SUS304 Steel Roller Using RSM Technique". Asian Journal of Engineering and Applied Technology 1, nr 2 (5.11.2012): 31–35. http://dx.doi.org/10.51983/ajeat-2012.1.2.2492.
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Finishing of cylindrical workpieces of SUS304 steel has been done using loosely bonded diamond based magnetic abrasives prepared by homogeneous mixing of magnetic powder (Fe powder of 300 mesh size (51.4μm)), abrasive powder (Diamond particles of 200 mesh size (41μm)), and lubricant. A central composite design involving four variables has been employed using RSM techniques to establish a mathematical model between parameters and response (percent improvement in surface finish), a series of experiments have been conducted using in-house fabricated setup. It has been found that magnetic flux density, quantity of magnetic abrasives, rotational speed of workpiece and percentage of abrasives in magnetic abrasives has significant effect on PISF. The maximum percentage improvement in surface finish was found to be 81% (0.04 μm Ra) at 1.0 Tesla of magnetic flux density, 40 mg of magnetic abrasives, 800 rpm as rotational speed of workpiece and 40% of abrasive. Scanning Electron Microscope (SEM) photographs shows that the surface generated by turning on lathe consists of deep scratches. The peaks have been sheared off to much smaller heights by MAF resulting in improved surface finish, but fine scratching marks produced by MAF appear on the surface.
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Bai, Chenzhao, Hongpeng Zhang, Chengjie Wang, Lebile Ilerioluwa Joseph, Qiang Wang, Yucai Xie i Guobin Li. "Design and Parameter Research of Time-Harmonic Magnetic Field Sensor Based on PDMS in Microfluidic Technology". Polymers 12, nr 9 (4.09.2020): 2022. http://dx.doi.org/10.3390/polym12092022.
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In order to improve the throughput and sensitivity of the inductive metal micro-abrasive particle detection sensor, this paper uses microfluidic detection technology to design a high-throughput abrasive particle detection sensor based on PDMS (Polydimethylsiloxane). Theoretical modeling analyzes the magnetization of metal abrasive particles in the coil’s time-harmonic magnetic field, and uses COMSOL simulation to calculate the best performance parameters of the sensor. Through the experiment of the control variable method, the corresponding signal value is obtained and the signal-to-noise ratio (SNR) is calculated. The SNR value and error value are calculated, and the SNR is corrected. The detection limit of the sensor is determined to be 10 μm iron particles and 60 μm copper particles. The optimal design parameters of the 3-D solenoid coil and the frequency characteristics of the sensor are obtained. Finally, through high-throughput experiments and analysis, it was found that there was a reasonable error between the actual throughput and the theoretical throughput. The design ideas suggested in this article can not only improve the sample throughput, but also ensure the detection accuracy. This provides a new idea for the development of an inductive on-line detection method of abrasive particle technology.
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Yan, Qiu Sheng, Yong Yang, Jia Bin Lu i Wei Qiang Gao. "Influence of Abrasive on Planarization Polishing with the Tiny-Grinding Wheel Cluster Based on the Magnetorheological Effect". Advanced Materials Research 76-78 (czerwiec 2009): 229–34. http://dx.doi.org/10.4028/www.scientific.net/amr.76-78.229.
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Experiments were conducted to polish optical glass with the magnetorheological (MR) effect-based tiny-grinding wheel cluster, and the influences of abrasive material, particle size and content on the material removal rate and surface roughness are investigated. The experimental results indicate that: the higher the hardness of abrasives, the higher the material removal rate, but the abrasives with lower hardness can obtain lower surface roughness. The better polishing quality of the workpiece can be obtained when the particle size of abrasives is similar to the particle size of magnetic particles. Moreover, the content of abrasives has an optimum value, and the material removal rate and the surface quality can not be improved further when the content of abrasives exceeds the optimum value. On the basis of above, the material removal model of the new planarization polishing technique is presented.
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Kwak, Tae-Soo, i Jae-Seob Kwak. "Magnetic Abrasive Polishing Technology with Ceramic Particles". Journal of the Korean Society for Precision Engineering 30, nr 12 (1.12.2013): 1253–58. http://dx.doi.org/10.7736/kspe.2013.30.12.1253.
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Chen, Y., Q. H. Song, X. Wang i Ning Ma. "Study on the Characteristics of Simply Mixed the Magnetic Abrasives Particles". Advanced Materials Research 24-25 (wrzesień 2007): 133–38. http://dx.doi.org/10.4028/www.scientific.net/amr.24-25.133.
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Utilize the characteristic that magnetic force line may penetrate the non-magnetic material, using the magnetic abrasive finishing (MAF) method complete to the non-magnetic small workpiece surface precise processing. In order to enhance polishing efficiency, usually with the magnetic particles and abrasive particles mixes together in the sinter method or the cementation method, the cost is higher; the variety is not also complete. Therefore, use the simply mixed method mixed the ferromagnetism iron particles, the alumina particles and the lipin, directly participates in magnetism polishing, already obtained the good processing effect through the experiment. This paper analysis and explanation the best experimental condition such as the granularity proportion of the ferromagnetism iron particles and the alumina particles etc.
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Poudel, Bibek, Hoa Nguyen, Guangchao Song, Patrick Kwon i Haseung Chung. "Novel Process Modeling of Magnetic-Field Assisted Finishing (MAF) with Rheological Properties". Lubricants 11, nr 6 (27.05.2023): 239. http://dx.doi.org/10.3390/lubricants11060239.
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The performance of a magnetic-field-assisted finishing (MAF) process, an advanced surface finishing process, is severely affected by the rheological properties of an MAF brush. The yield stress and viscosity of the MAF brush, comprising iron particles and abrasives mixed in a liquid carrier medium, change depending on the brush’s constituents and the applied magnetic field, which in turn affect the material removal mechanism and the corresponding final surface roughness after the MAF. A series of experiments was conducted to delineate the effect of MAF processing conditions on the yield stress of the MAF brush. The experimental data were fitted into commonly used rheology models. The Herschel–Bulkley (HB) model was found to be the most suitable fit (lowest sum of square errors (SSE)) for the shear stress–shear rate data obtained from the rheology tests and used to calculate the yield stress of the MAF brush. Processing parameters, such as magnetic flux density, weight ratio of iron and abrasives, and abrasive (black ceramic in this study) size, with p-values of 0.031, 0.001 and 0.037, respectively, (each of them lower than the significance level of 0.05), were all found to be statistically significant parameters that affected the yield stress of the MAF brush. Yield stress increased with magnetic flux density and the weight ratio of iron to abrasives in MAF brush and decreased with abrasive size. A new process model, a rheology-integrated model (RM), was formulated using the yield stress data from HB model to determine the indentation depth of individual abrasives in the workpiece during the MAF process. The calculated indentation depth enabled us to predict the material removal rate (MRR) and the instantaneous surface roughness. The predicted MRR and surface roughness from the RM model were found to be a better fit with the experimental data than the pre-existing contact mechanics model (CMM) and wear model (WM) with a R2 of 0.91 for RM as compared to 0.76 and 0.78 for CMM and WM. Finally, the RM, under parametric variations, showed that MRR increases and roughness decreases as magnetic flux density, rotational speed, weight ratio of iron to abrasive particles in MAF brush, and initial roughness increase, and abrasive size decreases.
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Xie, Hui Jun, i Yan Hua Zou. "Application of Magnetic Abrasive Finishing Process Using Alternating Magnetic Field for Finishing Polychlorotrifluoroethylene Resin". Materials Science Forum 1066 (13.07.2022): 85–90. http://dx.doi.org/10.4028/p-q08k66.
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In previous studies, it has been verified that the magnetic abrasive finishing process using alternating magnetic field can achieve higher finishing efficiency and surface quality, and nanolevel finishing of 5052 aluminum alloy material and SUS304 stainless steel material has been realized. In this study, the feasibility for ultra-precision finishing of polychlorotrifluoroethylene resin by this process was investigated, and the cutting mechanism of particles was discussed. As a result, the cutting depth of the particles is mainly affected by the size of the magnetic particles and abrasive particles. According to the experimental results, under optimized experimental conditions, the surface roughness of the workpiece can be improved from 112.83 nm Ra to 5 nm Ra within 15 minutes.
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Zou, Yan Hua, Takeo Shinmura i F. Wang. "Study on a Magnetic Deburring Method by the Application of the Plane Magnetic Abrasive Machining Process". Advanced Materials Research 76-78 (czerwiec 2009): 276–81. http://dx.doi.org/10.4028/www.scientific.net/amr.76-78.276.
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This research studies the influence of constant pressure acting on the magnetic particles brush for the precision machining of planar and curved workpieces. In particular, it examined the effects of constant pressure on improving the formal accuracy of the workpiece. This process method, constant pressure is applied to the magnetic pole of a conventional magnetic brush, the constant pressure acted to the surface of the workpiece through the magnetic particle brush formed at the magnetic pole surface. The authors conducted a plane magnetic abrasive finishing experiment using both the conventional magnetic abrasive finishing process and the newly proposed constant-pressure magnetic abrasive finishing process to compare the deburring characteristics between the processes for removing burrs from holes drilled in brass plate workpieces. In this experiment, a brass disk with a drilled hole was used as a workpiece. As a result, the difference in finishing characteristics was clarified. The results showed that the burr can be removed by use of this new plane magnetic abrasive finishing process and it is more useful than the conventional magnetic brush for improving the shape accuracy of the workpiece.
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Bansal, Ankit, Ravi Butola, M. S. Niranjan, Qasim Murtaza i Umang Soni. "Synthesis and Characterization of Sintered Magnetic Abrasives Used in Advance Finishing Processes Through Powder Metallurgy Route". INTERNATIONAL JOURNAL OF ADVANCED PRODUCTION AND INDUSTRIAL ENGINEERING 5, nr 3 (5.07.2020): 27–33. http://dx.doi.org/10.35121/ijapie202007345.
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The magnetic field-assisted surface finishing process needs a sintered magnetic abrasive powder which could be a mixture of SiC and CIP particles. Tube furnaces have been used to develop SiC-based sintered magnetic abrasives. The focus of this article is to investigate the anticipated results and to carry out the fabrication setup of sintered magnetic abrasive for the super-finishing of composite materials and their coating. The article depicts a significant effect on the mechanical properties such as microhardness and compressive strength and analyzes SiC and CIP composite-based microstructure. The synthesis of the powder involves four major processes like blending; compaction and sintering. Characterization of sintered magnetic abrasives has been done using SEM, EDS, XRD to study morphology, chemical composition, crystallography, and magnetic properties. The results have been compared with the un-bonded magnetic abrasives. This paper also presents a brief literature review of the state-of-the-art technology of high-performance surface finishing processes used in manufacturing industries. Finally, the downside and stray aspects of the related literature are spotlighted and a list of prospective issues for future research directions is recommended.
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Liu, Guangxin, Yugang Zhao, Zhihao Li, Hanlin Yu, Chen Cao, Jianbing Meng, Haiyun Zhang i Chuang Zhao. "Investigation of Spherical Al2O3 Magnetic Abrasive Prepared by Novel Method for Finishing of the Inner Surface of Cobalt–Chromium Alloy Cardiovascular Stents Tube". Micromachines 14, nr 3 (8.03.2023): 621. http://dx.doi.org/10.3390/mi14030621.
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In this investigation, spherical Al2O3 magnetic abrasive particles (MAPs) were used to polish the inner surface of ultra-fine long cobalt–chromium alloy cardiovascular stent tubes. The magnetic abrasives were prepared by combining plasma molten metal powder and hard abrasives, and the magnetic abrasives prepared by this new method are characterized by high sphericity, narrow particle size distribution range, long life, and good economic value. Firstly, the spherical Al2O3 magnetic abrasives were prepared by the new method; secondly, the polishing machine for the inner surface of the ultra-fine long cardiovascular stent tubes was developed; finally, the influence laws of spindle speed, magnetic pole speed, MAP filling quantities, the magnetic pole gap on the surface roughness (Ra), and the removal thickness (RT) of tubes were investigated. The results showed that the prepared Al2O3 magnetic abrasives were spherical in shape, and their superficial layer was tightly bound with Al2O3 hard abrasives with sharp cutting; the use of spherical Al2O3 magnetic abrasives could achieve the polishing of the inner surface of ultra-fine cobalt–chromium alloy cardiovascular bracket tubes, and after processing, the inner surface roughness (Ra) of the tubes decreased from 0.337 µm to 0.09 µm and had an RT of 5.106 µm.
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Liu, Guosong, Junye Li, Shangfu Zhu, Xu Zhu, Jiyong Qu i Xinming Zhang. "Experimental and Numerical Analysis of the Assisted Abrasive Flow of Magnetic Particles on the Polishing of Fuel Injection Nozzles". Magnetochemistry 8, nr 3 (21.03.2022): 35. http://dx.doi.org/10.3390/magnetochemistry8030035.
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Fuel injection nozzles are a key component of electronic injection engines, and their inner surface roughness affects the performance of the nozzles and restricts the working efficiency of the engine. Therefore, the polishing technology for a nozzle’s inner surface is particularly important. At present, abrasive flow polishing technology is commonly used to treat the inner surfaces of the nozzles. This study investigated the magnetic particles in the abrasive flow working medium. Due to the external magnetic field, magnetic particles are affected by the magnetic field force and change the polishing performance of the abrasive flow working medium. Through a numerical analysis and contrast experimental research, we can see that the choice of different grinding grain sizes, kinematic viscosity, magnetic field intensity, and process parameters, such as inlet pressure, with magnetic particles in a solid–liquid two-phase abrasive flow for polishing, can effectively improve the quality of the injection nozzle’s inner surface. The study also reveals that the influence of the nozzle’s inner surface polishing quality is significant and creates a mechanism for process parameters.
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JAYSWAL, S. C., V. K. JAIN i P. M. DIXIT. "MAGNETIC ABRASIVE FINISHING PROCESS — A PARAMETRIC ANALYSIS". Journal of Advanced Manufacturing Systems 04, nr 02 (grudzień 2005): 131–50. http://dx.doi.org/10.1142/s0219686705000655.
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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.
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Huang, Heng, Shizhong He, Xiaopeng Xie, Wei Feng, Huanyi Zhen i Hui Tao. "Research on the influence of inductive wear particle sensor coils on debris detection". AIP Advances 12, nr 7 (1.07.2022): 075204. http://dx.doi.org/10.1063/5.0090506.
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The debris detection characteristics of the inductive wear monitoring are researched by the method of combining theoretical research and simulation analysis in this paper. The mathematical model of the change in inductance is established based on the change in the coil magnetic field by the abrasive particles. By the COMSOL simulation software, the physical model of the three-coil wear monitoring is established, and the influence of the coil structure parameters on the output induced electromotance is compared and analyzed, resulting in the optimization of the coil parameters. For metal particles with different properties and sizes, the changes in the induced electromotance during the process of passing through the coil are analyzed, obtaining the mapping relationship between each particle size and the output induced electromotance. The simulation results show that the output voltage corresponding to the particles is related to the coil structure parameters, and the larger the particle size, the larger the output voltage. Finally, through experiments, the designed sensor coil structure has been proved to have a better detection effect on metal particles, realizing the detection of ferromagnetic abrasive particles above 100 µm and non-ferromagnetic abrasive particles above 200 µm.
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Kang, Gui Wen, i Fei Hu Zhang. "Research on Material Removal Mechanism of Magnetorheological Finishing". Materials Science Forum 532-533 (grudzień 2006): 133–36. http://dx.doi.org/10.4028/www.scientific.net/msf.532-533.133.
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Magnetorheological finishing (MRF) is a novel precision optical machining technology. MRF utilizes magnetic particles, nonmagnetic polishing abrasives in carrier fluid, and a magnetic field to finish optical materials. Owing to its flexible finishing process, MRF eliminates subsurface damage, corrects surface figure errors and the finishing process can be easily controlled by computer. To achieve deterministic finishing, it’s necessary to know the mechanism of material removal. Different magnetorheological fluids are used to finish optical glass on the same machining condition. The material removal and surface quality are examined after finishing with no polishing abrasive, aluminium oxide and cerium oxide. The results show that the hardness of polishing abrasive is not the main factors to affect material removal.
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Dong, Chao Wen, Yan Hua Zou i Hui Jun Xie. "Study on a New Kind of Magnetic Abrasive Finishing by Using Alternating Magnetic Field for Ultra-Precision Plane Finishing". Materials Science Forum 977 (luty 2020): 42–49. http://dx.doi.org/10.4028/www.scientific.net/msf.977.42.
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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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Zhao, Zeng Dian, Yu Hong Huang, Yu Gang Zhao i Xian Jin Yu. "Research on Preparation and Properties of Magnetic Abrasive by Conventional Solid-State Method". Key Engineering Materials 416 (wrzesień 2009): 553–57. http://dx.doi.org/10.4028/www.scientific.net/kem.416.553.
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The silicon-coated iron powder was evenly mixed with corundum powder and high temperature binder. After tabletting and sintering, followed by crushing and screening, the magnetic abrasive with a certain size was obtained. Scanning electron microscope (SEM), Energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) were respectively used to characterize the morphology, elemental composition and the crystalloid structures of magnetic abrasive. The ferromagnetic phase and abrasive phase were combined firmly. The magnetic abrasive prepared showed a good grinding ability, whose durable time was up to 24 min. Irregular particles was obtained by smashing the magnetic abrasive, mainly composed of Al2O3, Fe2O3, α-Fe, AlFeO3, (Al, Fe)7BO3(SiO4)3O3.
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Guo, Hui Ru, Yong Bo Wu, Ya Guo Li, Jian Guo Cao, M. Fujimoto i S. D. Jacobs. "Technical Performance of Zirconia-Coated Carbonyl-Iron-Particles Based Magnetic Compound Fluid Slurry in Ultrafine Polishing of PMMA". Key Engineering Materials 523-524 (listopad 2012): 161–66. http://dx.doi.org/10.4028/www.scientific.net/kem.523-524.161.
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A kind of zirconia-coated carbonyl-iron-particles (CIPs), which show long-time stability against aqueous, is installed in magnetic compound fluid (MCF) to polish PMMA. Performance (normal polishing force and surface roughness) of zirconia-coated CIP based MCF slurry with different CIP concentrations is investigated. For comparison, the performances of the conventional non-coated CIP (i.e., HQ) based MCF slurry and MRF slurry in which DI-water is employed instead of MF are also examined. In the presence of Al2O3 abrasive particles, the use of zirconia-coated CIP based MCF slurry can not result in better polishing performances compared with conventional HQ CIP based MCF slurry; In the absence of Al2O3 abrasive particles, higher normal polishing force and smoother work-surface were obtained with the zirconia-coated CIP based MCF slurry rather than the MRF slurry; For the zirconia-coated CIP based MCF slurry without abrasive particles, the concentration of zirconia-coated CIP should be less than a certain value (in the current work, 70 wt. %), otherwise MCF slurry shows bad particle dispersion and is easily dried, resulting in the loss of its polishing ability.
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Liu, Z. Q., Y. Chen, Y. J. Li i X. Zhang. "Comprehensive performance evaluation of the magnetic abrasive particles". International Journal of Advanced Manufacturing Technology 68, nr 1-4 (5.02.2013): 631–40. http://dx.doi.org/10.1007/s00170-013-4783-6.
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Chaudhry, Muhammad Junaid, Sascha Gentes, Alexander Heneka i Carla Olivia Krauß. "Wet sieving and magnetic separation for the treatment of radioactive secondary waste produced from waterjet abrasive suspension cutting". Safety of Nuclear Waste Disposal 2 (6.09.2023): 9–10. http://dx.doi.org/10.5194/sand-2-9-2023.
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Abstract. Dismantling of reactor pressure vessels and their built-in components is an enormous challenge in the deconstruction of a nuclear power plant. Due to the years of exposure to neutron radiation, the activated components can only be dismantled and packaged remotely. For reasons of radiation protection, preference is given to techniques that can be used underwater due to the shielding effect. A cutting method that meets these requirements is the waterjet abrasive suspension cutting technique (WAS). The cutting tool is capable of slicing metallic internals and other materials using a pure jet of water mixed with an abrasive substance at high velocity and pressure. The process offers numerous technical advantages, but it has a major disadvantage in producing secondary waste. Due to the addition of the abrasive substance, the WAS process produces a waste mixture of inactive abrasive particles and radioactive steel particles (activated by neutron radiation) during the dismantling of steel components in nuclear facilities. Since the steel particles are radioactive when the reactor pressure vessel (RPV) and its internals are dismantled, this particle mixture currently has to be disposed of as radioactive waste. This leads to a doubling of the radioactive waste. Despite the technical advantages, the WAS process used for cutting purposes is a severely disadvantage from an economic point of view, considering the significant disposal costs of the radioactive waste. The research project NaMaSK (wet sieving and magnetic separation of grain mixtures to minimise secondary waste in the dismantling of nuclear facilities), funded by the German Federal Ministry of Education and Research (BMBF), aims to separate the two fractions (abrasive and steel particles) with the help of magnetic separation and wet sieving. For this purpose, a prototype separation system MaSK (magnetic separation of grain mixtures to minimise secondary waste in the dismantling of nuclear facilities) with a magnetic filter and sieve has already been built and tested, and it can separate up to 98 % of the steel particles from the mixture. The separation process aimed to reduce the total amount of secondary waste by reusing abrasive particles for further WAS cutting. In the new test plant NaMaSK, the mode of operation will be converted from a batch process to continuous operation to highlight the economic aspect of the separation process. In this regard, an efficient design of the sieve structure and magnetic filter, followed by process optimisation, will be implemented. These new developments and the first results will be presented at the conference.
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Zou, Yanhua, Ryunosuke Satou, Ozora Yamazaki i Huijun Xie. "Development of a New Finishing Process Combining a Fixed Abrasive Polishing with Magnetic Abrasive Finishing Process". Machines 9, nr 4 (12.04.2021): 81. http://dx.doi.org/10.3390/machines9040081.
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High quality, highly efficient finishing processes are required for finishing difficult-to-machine materials. Magnetic abrasive finishing (MAF) process is a finishing method that can obtain a high accuracy surface using fine magnetic particles and abrasive particles, but has poor finishing efficiency. On the contrary, fixed abrasive polishing (FAP) is a polishing process can obtain high material removal efficiency but often cannot provide a high-quality surface at the nano-scale. Therefore, this work proposes a new finishing process, which combines the magnetic abrasive finishing process and the fixed abrasive polishing process (MAF-FAP). To verify the proposed methodology, a finishing device was developed and finishing experiments on alumina ceramic plates were performed. Furthermore, the mechanism of the MAF-FAP process was investigated. In addition, the influence of process parameters on finishing characteristics is discussed. According to the experimental results, this process can achieve high-efficiency finishing of brittle hard materials (alumina ceramics) and can obtain nano-scale surfaces. The surface roughness of the alumina ceramic plate is improved from 202.11 nm Ra to 3.67 nm Ra within 30 min.
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Ahn, Byung Woon, i Seoung Hwan Lee. "Run-to-run process control of magnetic abrasive finishing using bonded abrasive particles". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 226, nr 12 (24.10.2012): 1963–75. http://dx.doi.org/10.1177/0954405412462318.
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Sun, Huan Wu, i Shu Cai Yang. "Revolved Surface Finishing with Smart Fluid Abrasives". Key Engineering Materials 304-305 (luty 2006): 579–83. http://dx.doi.org/10.4028/www.scientific.net/kem.304-305.579.
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The smart fluid abrasive (SFA) is a suspension of magnetically soft ferromagnetic particles and nonmagnetic abrasives in a carrier liquid. When the SFA is exposed to a magnetic field, a rapid and reversible fluid-to-solid phase transition occurs. Based on these distinctive features of SFA, a new type of precision finishing technology that can be used in the finishing of the revolved surface has been developed, and the finishing results have been proved in our experiments. In this paper, the SFA finishing mechanism and finishing process are presented, the influence of some basic parameters such as magnetic strength, size of abrasives, time of processing and relative motion between abrasives and working surface of work pieces are discussed as well.