Shorey A.B. (et al.) Understanding the mechanism of glass removal in magnetorheological finishing (MRF)

Статья. Опубликована в журнале "LLE Review". – 2000. – Vol. 83 – P. 157-172. Название на русском языке: Понимание механизма удаления стекла при магнитореологическом полировании (MRF). Авторы: A.B. Shorey, S.D. Jacobs, W.I. Kordonski, R.F. Gans. Аннотация к статье на английском языке:
The mechanisms of material removal in MRF have been presented. Previous work describes how the shear stress due to the hydrodynamic flow of the MR fluid between the rotating wheel and the part surface controls the removal rate. The idea that material removal depends on the shear stress at the part surface is supported by the linear relation between removal rate and the total drag force shown here. It has also been shown previously that the nanohardness of the CI is important in material removal with nonaqueous MR fluids. We show here that as DI water is added to the MR fluid, the differences in the behavior of the hard and soft CI become less significant as the removal rate dramatically increases for both. This is due to either the presence of a hydrated layer or reduced fracture toughness of the glass in aqueous MR fluids. The addition of nonmagnetic nano-abrasives increases removal rates further since they move to the interface between the CI and the glass surface to control material removal. A transition from twobody to three-body removal is hypothesized. The relative increase in removal depends on the amount and type of the abrasive since different abrasives interact with the glass surface in different ways. This behavior of the abrasive is evident from both AFM scans as well as drag force measurements. More work should allow these results to be summarized in a modified Preston equation based on the local shear stress at the part surface.