Results 131 to 140 of about 1,412 (158)

History of magnetorheological finishing

SPIE Proceedings, 2011
Magnetorheological finishing (MRF) is a deterministic method for producing complex optics with figure accuracy
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Shear stress in magnetorheological finishing for glasses

Applied Optics, 2009
We report in situ, simultaneous measurements of both drag and normal forces in magnetorheological finishing (MRF) for what is believed to be the first time, using a spot taking machine (STM) as a test bed to take MRF spots on stationary parts. The measurements are carried out over the entire area where material is being removed, i.e., the projected ...
Chunlin, Miao, Shai N, Shafrir, John C, Lambropoulos, Joni, Mici, Stephen D, Jacobs   +4 more
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Material removal in magnetorheological finishing of optics

Applied Optics, 2011
A concept of material removal based on the principle of conservation of particles momentum in a binary suspension is applied to analyze material removal in magnetorheological finishing and magnetorheological jet processes widely used in precision optics fabrication.
William, Kordonski, Sergei, Gorodkin
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Planarization of Gratings using Magnetorheological Finishing

MRS Proceedings, 1997
ABSTRACTSurface planarization of BK7 glass gratings with periods of 130, 30, 16, 8 and 5 gm was performed with the magnetorheological finishing (MRF) process at the Center for Optics Manufacturing (COM). Approximately 0.5 μm of material was removed in the experiments.
Fuqian Yang, D. Golini, D. H. Raguin, S. D. Jacobs   +3 more
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Clitella Magnetorheological Finishing Method and Equipment

Key Engineering Materials, 2013
Clitella magnetorheological finishing is a processing ultra-smooth surface method, which has high processing efficiency and relatively low precision machine tool mechanical structure. This paper introduced processing methods that use a clitella magnetorheological finishing technology to achieve an arbitrary radius of curvature of the spherical optical ...
Zhi Qiang Yang, Zhong Da Guo, Wei Guo Liu   +2 more
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Magnetorheological Finishing of SiC Aspheric Mirrors

Materials and Manufacturing Processes, 2005
ABSTRACT Many high-precision optical components are made of glass, but they can also be made of a wide variety of other materials. For example, reaction-bonded silicon carbide (RB-SiC) has recently been used to make optical parts for poor working conditions due to its distinct properties such as low density, high hardness, and low thermal expansion ...
Haobo Cheng, Zhijing Feng, Yingwei Wang, Shuting Lei   +3 more
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Rheological Characterization of Magnetorheological Finishing Fluid

Materials and Manufacturing Processes, 2009
Magnetorheological finishing (MRF) is a precision material removal process that has been applied to a large variety of brittle materials, from optical glasses to hard crystals, such as sapphire. MRF is based on a magnetorheological (MR) fluid that consists of carbonyl iron powder (CIP), polishing abrasives, water, and stabilizers.
Ajay Sidpara, Manas Das, V. K. Jain
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Precision optics fabrication using magnetorheological finishing

SPIE Proceedings, 1997
Optical polishing with magnetic media has evolved extensively over the past decade. Of the approaches conceived during this time, the newest process is called magnetorheological finishing (MRF). In MRF, all of the process parameters are controlled by utilizing the state of hydrodynamic flow of a magnetically stiffened magnetorheological abrasive fluid ...
Donald Golini, Stephen D. Jacobs, William I. Kordonski, Paul Dumas   +3 more
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Magnetorheological Jet (MR JetTM) Finishing Technology

Journal of Fluids Engineering, 2005
Conformal (or freeform) and steep concave optics are important classes of optics that are difficult to finish using conventional techniques due to mechanical interferences and steep local slopes. One suitable way to polish these classes of optics is by using a jet of abrasive/fluid mixture.
William I. Kordonski, Aric B. Shorey, Marc Tricard   +2 more
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Toward Magnetorheological Finishing of Magnetic Materials

Journal of Manufacturing Science and Engineering, 2007
Magnetorheological finishing (MRF) is a precision optical finishing process traditionally limited to processing only nonmagnetic materials, e.g., optical glasses, ceramics, polymers, and metals. Here we demonstrate that MRF can be used for material removal from magnetic material surfaces.
Shai N. Shafrir, John C. Lambropoulos, Stephen D. Jacobs   +2 more
openaire   +1 more source