Magnetorheological method applied to optics polishing: A review

Kumar, Manjesh; Kumar, Abhinav; Alok, Anupam; Das, Manas

doi:10.1088/1757-899x/804/1/012012

Cited by 28 publications

(14 citation statements)

References 35 publications

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“…R-MRFF process can uniformly polish complex metallic components at the nanometer level [6]. R-MRFF process uses magnetorheological-polishing (MRP) fluid or medium, in which viscosity can change considerably in the existence of a magnetic field [7]. MR polishing medium has the composition of iron and abrasive grains in a base media.…”

Section: List Of Symbolsmentioning

confidence: 99%

Improvement in Surface Characteristics of SS316L Tiny Gear Profiles by Magnetorheological-Polishing Fluid Using Flow Restrictor

Kumar

Das

2021

Trans Indian Inst Met

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Nano-finishing of small-scale gears is difficult because their geometric complexity is really challenging. The high-speed application causes noise or vibration between the meshing teeth. The traditional method for finishing of tiny gears produces a surface error on its profiles. Very few finishing processes can be applied to SS316L tiny gears due to the narrow spacing between their teeth. In the current study, the stainless-steel tiny gear teeth profiles are polished using a novel flow restrictor by the magnetorheological-polishing fluid-based finishing process. The minimum ultrafine surface roughness R a of 23.9 nm at tiny gear teeth profiles is obtained. All surface defects like burrs, dents, scratches and pits are also completely removed. The finishing results are compared with and without using a flow restrictor. A theoretical analysis of the magnetic force responsible for finishing is also done to recognize the process accurately.

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Section: List Of Symbolsmentioning

confidence: 99%

Improvement in Surface Characteristics of SS316L Tiny Gear Profiles by Magnetorheological-Polishing Fluid Using Flow Restrictor

Kumar

Das

2021

Trans Indian Inst Met

Self Cite

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“…[3]. In particular, the technology has been successfully commercialized in automotive suspension systems and high-quality optics [4,5].…”

Section: Introductionmentioning

confidence: 99%

Review: A Survey on Configurations and Performance of Flow-Mode MR Valves

et al. 2022

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Magnetorheological (MR) actuators are semi-active devices controlled by magnetic stimuli. The technology has been commercialized in the automotive industry or high-quality optical finishing applications. It harnesses the rheology of smart fluids to result in the unique application of the material. By a wide margin, the most common example of an MR actuator is a flow-mode single-tube housing with a control valve (electromagnet with a fixed-size air gap filled with the MR fluid) operating in a semi-active vibration control environment. The analysis of the prior art shows that the developed configurations of MR valves vary in size, complexity, the ability to generate adequate levels of pressure, and the interactions with the MR fluid’s rheology resulting in various performance envelopes. Moreover, miscellaneous testing procedures make a direct valve-to-valve comparison difficult. Therefore, in this paper we present a detailed and systematic review of MR control valves, provide classification criteria, highlight the operating principle, and then attempt to categorize the valves into groups sharing similarities in the design and performance envelope(s). Moreover, a simple performance metric based on the shear stress calculation is proposed, too, for evaluating the performance of particular valving prototypes. In the review, we discuss the key configurations, highlight their strengths and weaknesses and explore various opportunities for tuning their performance range. The review provides complementary information for the engineers and researchers with a keen interest in MR applications, in general. It is an organized and and critical study targeted at improvements in the categorization and description of MR devices.

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“…Various research articles and studies that take advantage of the potential of MRF continue to be carried out, for example, with regard to shock absorbers [7,[10][11][12][13], brakes [14][15][16], valves [12,[17][18][19], polishing [20][21][22], haptic devices [23][24][25], mounts [26][27][28], and sound propagation [29,30].…”

Section: Introductionmentioning

confidence: 99%

Effect of Time and Frequency of Magnetic Field Application on MRF Pressure Performance

et al. 2022

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This research was conducted to determine the effect of the time and frequency of magnetic field application on MRF pressure performance. It was carried out by placing magnetorheological fluid (MRF) in a U-shaped, glass tube and then repeatedly applying a magnetic field to it for a certain time period with a particular frequency set by the generator frequency. The length of the application period of the magnetic field, the frequency of the application of the magnetic field, and the magnitude of changes in fluid pressure that occurred and changes in pressure in the MRF were recorded with a data logger for a specific time, which was 60 s. From the field tests that were carried out, it was found that during the application of a continuous magnetic field, there was pressure on the MRF until it reached the maximum pressure; then, there was a gradual decrease in pressure when the magnetic field was turned off, but the pressure was intense. It was shown that the pressure decreased rapidly as the magnetism disappeared, even causing the pressure to drop below the initial pressure, which, in turn, gradually rose again toward the equilibrium pressure. Meanwhile, during the repeated application of a magnetic field, it appeared that the MRF effectively produced pressure in response to the presence of a magnetic field up to a frequency of 5 Hz. The higher the applied magnetic field frequency, the smaller the pressure change that occurred. Starting at a frequency of 10 Hz, the application of a magnetic field produced more minor pressure changes, and the resulting pressure continued to decrease as the liquid level decreased toward the initial equilibrium position.

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Magnetorheological method applied to optics polishing: A review

Cited by 28 publications

References 35 publications

Improvement in Surface Characteristics of SS316L Tiny Gear Profiles by Magnetorheological-Polishing Fluid Using Flow Restrictor

Improvement in Surface Characteristics of SS316L Tiny Gear Profiles by Magnetorheological-Polishing Fluid Using Flow Restrictor

Review: A Survey on Configurations and Performance of Flow-Mode MR Valves

Effect of Time and Frequency of Magnetic Field Application on MRF Pressure Performance

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