Rheological Properties of Magnetorheological Polishing Fluid for Micro Mould Polishing

2019 ◽  
pp. 490-496
Author(s):  
Nurain Abdul Mutalib ◽  
Izwan Ismail ◽  
Sofarina M. Soffie ◽  
Syarifah Nur Aqida Syed Ahmad
Keyword(s):  
Rheological Properties ◽  
Polishing Fluid ◽  
Magnetorheological Polishing Fluid ◽  
Magnetorheological Polishing

Preparation of Magnetorheological Polishing Fluid and Its Polishing Stability

2014 ◽  
Vol 34 (4) ◽  
pp. 0416001 ◽  
Author(s):  
白杨 Bai Yang ◽  
张峰 Zhang Feng ◽  
邓伟杰 Deng Weijie ◽  
李龙响 Li Longxiang ◽  
郑立功 Zheng Ligong ◽  
...  
Keyword(s):  
Polishing Fluid ◽  
Magnetorheological Polishing Fluid ◽  
Magnetorheological Polishing

Specific features of non-Newtonian magnetorheological fluid flow in the workpiece–instrument gap of a polishing facility

2017 ◽  
Vol 29 (1) ◽  
pp. 116-124
Author(s):  
Evguenia V Korobko ◽  
Albert A Mokeev ◽  
Anastasiya V Kryt ◽  
Egidijus Dragašius ◽  
Andrei A. Mokeev
Keyword(s):  
Magnetic Field ◽  
Fluid Flow ◽  
Pressure Drop ◽  
Strength Distribution ◽  
Navier Stokes ◽  
Inlet Section ◽  
Navier Stokes Equation ◽  
Polishing Fluid ◽  
Magnetorheological Polishing Fluid ◽  
Magnetorheological Polishing

The model of magnetorheological polishing fluid flow has been developed in the form of a jet formed in the gradient magnetic field in the gap between the workpiece and the instrument of a polishing facility. The model allows one to determine the shape of the transverse and longitudinal sections of the jet and the pressure acting on the workpiece surface being polished, while accounting for the known configuration of the gap and magnetic field strength distribution. The appearance of the nose surf and the stern concurrent wave producing an additional pressure drop in the workpiece–instrument gap has been established. The solution of the Navier–Stokes equation in the approximation of lubrication for magnetorheological polishing fluid with boundary conditions accounting for the action of inertial forces has shown that in the inlet section of the gap the pressure drop is positive, and the velocity profile is almost flat near the workpiece, whereas closer to the outlet from the gap, the pressure falls below the atmospheric pressure. The pressure is maximum at the forward edge of the workpiece, as in the case of the well-known phenomenon of hydroplaning.

Evaluation of Rheological Properties of Magnetorheological Polishing Fluid and Their Effect on Surface Finish in Ultra Precision Finishing Processes

2005 ◽  
Author(s):  
Sunil Jha ◽  
V. K. Jain
Keyword(s):  
Particle Size ◽  
Rheological Properties ◽  
Surface Finish ◽  
Iron Particle ◽  
Abrasive Particles ◽  
Ultra Precision ◽  
Effect Of Particle Size ◽  
Finishing Processes ◽  
Polishing Fluid ◽  
Magnetorheological Polishing Fluid

Magnetorheological finishing (MRF) process for automated lens finishing and Magnetorheological abrasive flow finishing (MRAFF) for internal geometries rely on unique smart behavior of MRP-fluid. The rheological properties of MRP-fluid depend on carbonyl iron particle (CIP) and silicon carbide (SiC) particle size, their volume concentration, magnetic properties and applied magnetic field strength. To study the effect of particle size on rheological properties of MRP-fluid, a hydraulically driven specially designed capillary rheometer is fabricated. The best surface finish improvement was obtained with MRP-fluid containing approximately equal diameter of abrasive particles and CIPs. Least improvement was noticed with smaller CIPs and bigger abrasive combinations used. This is because the smaller size CIPs are incapable of providing the necessary finishing forces for bigger abrasive particles, which results in weak bonding strength.

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