Normal force and drag force in magnetorheological finishing

Chunlin Miao; Shai N. Shafrir; John C. Lambropoulos; Stephen D. Jacobs

doi:10.1117/12.826415

21 August 2009 Normal force and drag force in magnetorheological finishing

Chunlin Miao, Shai N. Shafrir, John C. Lambropoulos, Stephen D. Jacobs

Proceedings Volume 7426, Optical Manufacturing and Testing VIII; 74260C (2009) https://doi.org/10.1117/12.826415
Event: SPIE Optical Engineering + Applications, 2009, San Diego, California, United States

Abstract

The material removal in magnetorheological finishing (MRF) is known to be controlled by shear stress, λ, which equals drag force, F_d, divided by spot area, As. However, it is unclear how the normal force, F_n, affects the material removal in MRF and how the measured ratio of drag force to normal force F_d/F_n, equivalent to coefficient of friction, is related to material removal. This work studies, for the first time for MRF, the normal force and the measured ratio Fd/Fn as a function of material mechanical properties. Experimental data were obtained by taking spots on a variety of materials including optical glasses and hard ceramics with a spot-taking machine (STM). Drag force and normal force were measured with a dual load cell. Drag force decreases linearly with increasing material hardness. In contrast, normal force increases with hardness for glasses, saturating at high hardness values for ceramics. Volumetric removal rate decreases with normal force across all materials. The measured ratio F_d/F_n shows a strong negative linear correlation with material hardness. Hard materials exhibit a low "coefficient of friction". The volumetric removal rate increases with the measured ratio F_d/F_n which is also correlated with shear stress, indicating that the measured ratio F_d/F_n is a useful measure of material removal in MRF.

Citation Download Citation

Chunlin Miao, Shai N. Shafrir, John C. Lambropoulos, and Stephen D. Jacobs "Normal force and drag force in magnetorheological finishing", Proc. SPIE 7426, Optical Manufacturing and Testing VIII, 74260C (21 August 2009); https://doi.org/10.1117/12.826415

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