Magnetorheological finishing process for hard materials using sintered iron-CNT compound abrasives

Jung, Bongsu; Jang, Kyung In; Min, Byung Kwon; Lee, Sang Jo; Seok, Jongwon

doi:10.1016/j.ijmachtools.2008.12.002

Cited by 70 publications

(38 citation statements)

References 24 publications

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“…Figure 3 shows the variation of the removal rate and surface roughness under different magnetic fields for steel samples with MRF-132DG. During the experiment, the rotating speed of the pin was 297 rpm and the normal load was set at 50 N. As can be seen in Figure 3(a), the removal rate was more than 3.1×10 5 mm 3 /min, which is more efficient compared to general removal rate of 0.6×10 5 mm 3 /min [7]. The removal rate obviously decreased with the increase of magnetic field and was more likely to reach steady state under high magnetic fields.…”

Section: Experimentationmentioning

confidence: 98%

“…The results showed that MR finishing was particularly useful for the fabrication of circular surfaces, and the surface roughness and the radius of curvature of workpiece could be controlled. Jung, et al proposed a magneto-rheological finishing process for hard materials using sintered iron-carbon nanotube (I-CNT) compound abrasives [7]. It was shown that these abrasives increase the lifetime of consumables (magneto-rheological fluid and abrasives) and the material removal rate.…”

Section: Introductionmentioning

confidence: 99%

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Micro-precision surface finishing using magneto-rheological fluid

Song

Choi

Lee

et al. 2011

Sci. China Technol. Sci.

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In order to improve the surface quality of machining workpiece, this paper studied a micro-precision surface finishing method by applying magneto-rheological fluid to the machined surface. A pin-on-disc testing apparatus was used to carry out surface finishing experiment of steel under different magnetic fields. Magneto-rheological fluid is colloidal suspension and stiffens into semi-solid when subjected to a magnetic field. Thus, the surface roughness of the finished surface could be controlled by magneto-rheological fluid under the different magnetic fields. Several sets of tests were performed with various normal loads, finishing speeds and magnetic fields. Removal rate was calculated by the removal loss monitored by testing apparatus, while microstructures of the finished surface of pin and disk were observed by scanning electron microscope. The micro-precision roughness of finished surface was analyzed by surface profilometer. The obtained test results showed different surface characteristics of the test material under different magnetic fields and proved the feasibility of this micro-precision surface finishing method to reduce the surface roughness of machining workpiece efficiently. At the same time, the effects of the various applied normal loads and rotating speeds on the finishing surface by magneto-rheological fluid were investigated. magnetorheological fluid, surface finishing, removal rate, surface roughness Citation: Song W L, Choi S B, Lee D W, et al. Micro-precision surface finishing using magneto-rheological fluid.

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Section: Experimentationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Micro-precision surface finishing using magneto-rheological fluid

Song

Choi

Lee

et al. 2011

Sci. China Technol. Sci.

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“…Recently, the use of nanoparticles, including carbon nanotubes (CNT), in crushing and polishing tools, as coating materials too, has become very attractive [74][75][76][77][78][79] and the reported data [74] demonstrate that the addition of CNT tends to lower the grain size of the structural constituent of the binder determining higher strength and performance to the metallic binder.…”

Section: Hard Metals: Overview and Some Propertiesmentioning

confidence: 99%

Manufacturing, Composition, Properties and Application of Sintered Hard Metals

Peter¹,

Rosso²

2017

Powder Metallurgy - Fundamentals and Case Studies

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Among other materials, hard metals represent an important family of functional materials. They show properties that are combinations of those of their constituents. The general idea while using hard metals is to exploit their excellent properties in terms of hardness, toughness, wear resistance, and chemical stability. These characteristics made hard metals as promising candidate for use as a cutting tool, which constitutes their main area of application. Depending on the particular use, the most important properties can be achieved: (i) by properly selecting the constituents made up the whole composition, (ii) by varying the relative composition of the phases, or (iii) by applying a suitable hard metal coating layer on the top of the cutting tool. This chapter presents a general overview of the actual scenario concerning different tool materials, including a short history and description of state-of-the-art techniques as regards their composition, their manufacturing routes and their most important properties. Some results of the own research in this field are carried out during the years will integrate this part.

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“…A new kind of sintered iron-CNT compound abrasives was developed for MR finishing of hard work-piece surface. The parametric study has been done to improve the rate of material removal, and tool aging effect has been minimized [13]. CIP and silicon carbide (SiC) based sintered magnetic abrasives has been developed in tubular furnace at 1000°C in an inert atmosphere of argon using pressureless solid phase sintering method.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation into tool aging effect in ball end magnetorheological finishing

Niranjan

Jha

2015

Int J Adv Manuf Technol

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Magnetorheological (MR) finishing is a smart finishing processes applied to a variety of applications. In the present work, an attempt has been made to improve the percentage reduction in surface roughness with sintered magnetic abrasives based MRP fluid on BEMRF tool. Sintered magnetic abrasives were developed by mixing of 20 vol% carbonyl iron powder (CIP) CS grade and 25 vol% SiC in ball mill then pellets of 5 g each have been made at 8 ton pressure. These pellets were allowed to sinter in tubular furnace at 1200°C in the controlled atmosphere of argon. The sintered pellets were crushed in a ball mill to obtain sintered magnetic abrasives. The morphology and magnetizability of sintered magnetic abrasives have been studied with scanning electron microscope (SEM) and vibration sample magnetometer (VSM). MRP fluid was synthesized with 45 vol% sintered magnetic abrasives and 55 vol% base fluid. Experiments were conducted on mild steel work-piece for 30 min using BEMRF tool at given machining conditions. Percentage reduction in surface roughness (%ΔR a ) was calculated and compared with %ΔR a obtained by finishing mild steel work-piece with unbonded magnetic abrasives based MRP fluid and found better results. The effect of rotation per minute (RPM) on %ΔR a has been studied and found optimum by conducting the experiments at higher values of RPM keeping other machining conditions same. The experimental study shows that the sintered magnetic abrasives based MRP fluid in MR finishing may be used at higher rotational speeds without tool aging effect and impart a higher finishing force on the workpiece surface, improves finishing capability of the process.

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Magnetorheological finishing process for hard materials using sintered iron-CNT compound abrasives

Cited by 70 publications

References 24 publications

Micro-precision surface finishing using magneto-rheological fluid

Micro-precision surface finishing using magneto-rheological fluid

Manufacturing, Composition, Properties and Application of Sintered Hard Metals

Experimental investigation into tool aging effect in ball end magnetorheological finishing

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