Micro-precision surface finishing using magneto-rheological fluid

Abstract

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.

Study on Material Removal Model by Reciprocating Magnetorheological Polishing

“…where dist describes the coordinate position (m) of the abrasive particle's reciprocating motion in the working stroke L, dist = v w t (v w represents the reciprocating velocity of the fluid carrier) and dist ∈ [−L/2, The MRR of RMRP further derived by substituting Equation (12) and Equation (18) into Equation (1) as:…”

“…The MRR of RMRP further derived by substituting Equation (12) and Equation ( 18) into Equation (1) as:…”

“…In short, the aforementioned manufacturing technologies can polish an optical workpiece; however, the disadvantages are still obvious. MRP is considered the “gentle” manufacturing technology, and the shortcomings in the above processing can be effectively compensated [ 9 , 10 , 11 , 12 ].…”

Preparation and experiment of magnetorheological polishing fluid in reciprocating magnetorheological polishing process

“…Preston equation is used to consider the material removal rate, and it is shown as (Song et al, 2012)…”

A Study on the Effect of the Material and Applied Magnetic Field Strength on the Friction Characteristics of Magnetorheological Fluids

“…자기장이 자기유변유체에 가 해지게 되면 유체 내부의 철 입자가 자기장 방향에 따라 사슬 모양을 형성함에 따라 강성 및 댐핑 특성 이 변하게 된다. [3][4][5]. 이와 같은 분야에 자기유변유체를 적용하기 위해서는 마찰 에 대한 연구가 필수적이다.…”