Optics Manufacturing Using Magnetorheological Finishing

2008 ◽  
Vol 375-376 ◽  
pp. 274-277
Author(s):  
Gui Wen Kang ◽  
Fei Hu Zhang
Keyword(s):  
Dwell Time ◽  
Time Algorithm ◽  
Subsurface Damage ◽  
Numerical Control ◽  
Surface Shape ◽  
Magnetorheological Finishing ◽  
High Quality ◽  
Finishing Process ◽  
Surface Figure

Magnetorheological finishing (MRF) is a novel precision optical machining technology. Owing to its flexible finishing process, MRF can eliminate subsurface damage, smooth rms micro roughness and correct surface figure errors. The finishing process can be easily controlled by a computer. Through proper designing of numerical control, sphere and asphere optics can be machined by magnetorheological finishing with high quality. Optical sphere is machined using dwell time algorithm and surface shape 2 pt. PV has been improved from 0.17um to 0.07um.

Discussion on Laser Cleaning of Optical Surface Machined by Magnetorheological Finishing

2010 ◽  
Vol 135 ◽  
pp. 409-412 ◽  
Author(s):  
Gui Wen Kang
Keyword(s):  
Laser Cleaning ◽  
Numerical Control ◽  
Flowing Water ◽  
Optical Surface ◽  
Working Ability ◽  
Magnetorheological Finishing ◽  
High Quality ◽  
Finishing Process ◽  
Optical Manufacturing ◽  
Surface Figure

Magnetorheological finishing (MRF) is a novel precision optical machining technology. Owing to its flexible finishing process, MRF can eliminate subsurface damage, smooth rms micro roughness and correct surface figure errors. Through proper designing of numerical control, sphere and asphere optics can be machined by magnetorheological finishing with high quality. Owing to it’s excellence in optical manufacturing, MRF has gained more and more application in industry. Under most conditions the optical surface after MRF would have certain contaminant particles and this would affect its working ability in future use. Formerly the polished workpiece is cleaned by flowing water or ultrasonic cleaning and the contaminat particles couldn’t be totally removed. Laser cleaning is brought forward in this paper and good results could be anticipated.

Dwell time algorithm based on the optimization theory for magnetorheological finishing

2010 ◽  
Author(s):  
Yunfei Zhang ◽  
Yang Wang ◽  
Yajun Wang ◽  
Jianguo He ◽  
Fang Ji ◽  
...  
Keyword(s):  
Dwell Time ◽  
Optimization Theory ◽  
Time Algorithm ◽  
Magnetorheological Finishing

Dwell Time Algorithm for Large Aperture Optical Element in Magnetorheological Finishing

2014 ◽  
Vol 34 (5) ◽  
pp. 0522001
Author(s):  
李龙响 Li Longxiang ◽  
邓伟杰 Deng Weijie ◽  
张斌智 Zhang Binzhi ◽  
白杨 Bai Yang ◽  
郑立功 Zheng Ligong ◽  
...  
Keyword(s):  
Dwell Time ◽  
Optical Element ◽  
Time Algorithm ◽  
Magnetorheological Finishing ◽  
Large Aperture

Optimized dwell time algorithm in magnetorheological finishing

2015 ◽  
Vol 81 (5-8) ◽  
pp. 833-841 ◽  
Author(s):  
Longxiang Li ◽  
Ligong Zheng ◽  
Weijie Deng ◽  
Xu Wang ◽  
Xiaokun Wang ◽  
...  
Keyword(s):  
Dwell Time ◽  
Time Algorithm ◽  
Magnetorheological Finishing

The Research in Algorithm for MRF Forming Dwell Time of Optical Components

2010 ◽  
Vol 102-104 ◽  
pp. 750-753
Author(s):  
Zheng Min Yang ◽  
Hong Ping Hu ◽  
Yu Bin Gao
Keyword(s):  
Dwell Time ◽  
Time Algorithm ◽  
Surface Shape ◽  
Shape Error ◽  
Optical Components ◽  
Face Shape ◽  
Shape Precision ◽  
Resident Time ◽  
Magneto Rheological ◽  
New Generation

Magnetorheological finishing technology is a new generation of high-precision optical accessory polishing and processing methods. It presents a MRF dwell time algorithm that can quickly calculate the resident time during magnetorheological processing of the rotational optical parts. A magnetorheological forming polishing experiment on a prototype has been carried out on BK9 glass parts of 20mm rotary symmetrical face shape. The algorithm can improve the surface shape precision of the workpiece from 6.5um to 0.61um. Emulational and experimental results show that the surface shape error of a spherical polished workpiece is convergent by this method, which is also, applies to magneto-rheological finishing of non-spherical and planar workpiece.

Research on Material Removal of Magnetorheological Finishing

2007 ◽  
Vol 329 ◽  
pp. 285-290
Author(s):  
Gui Wen Kang ◽  
Fei Hu Zhang
Keyword(s):  
Material Removal ◽  
Removal Rate ◽  
Mathematic Model ◽  
Magnetorheological Finishing ◽  
Fixed Rate ◽  
Hydrodynamic Analysis ◽  
Finishing Process ◽  
Material Removal Model ◽  
Removal Model ◽  
Surface Figure

Magnetorheological finishing (MRF) is a novel precision optical machining technology. Owing to its flexible finishing process, MRF can eliminate subsurface damage, smooth rms micro roughness and correct surface figure errors. The finishing process can be easily controlled by a computer. Material removal model in MRF is established. According to Preston equation in optical machining, mathematic model of material removal rate in MRF rotating at fixed rate is established through hydrodynamic analysis of the MR fluid flow in the polishing zone. The validity of the model is examined by the experimental results.

Research on Material Removal Mechanism of Magnetorheological Finishing

2006 ◽  
Vol 532-533 ◽  
pp. 133-136
Author(s):  
Gui Wen Kang ◽  
Fei Hu Zhang
Keyword(s):  
Material Removal ◽  
Optical Materials ◽  
Magnetic Particles ◽  
Optical Glass ◽  
Material Removal Mechanism ◽  
Magnetorheological Finishing ◽  
Carrier Fluid ◽  
Finishing Process ◽  
Main Factors ◽  
Surface Figure

Magnetorheological finishing (MRF) is a novel precision optical machining technology. MRF utilizes magnetic particles, nonmagnetic polishing abrasives in carrier fluid, and a magnetic field to finish optical materials. Owing to its flexible finishing process, MRF eliminates subsurface damage, corrects surface figure errors and the finishing process can be easily controlled by computer. To achieve deterministic finishing, it’s necessary to know the mechanism of material removal. Different magnetorheological fluids are used to finish optical glass on the same machining condition. The material removal and surface quality are examined after finishing with no polishing abrasive, aluminium oxide and cerium oxide. The results show that the hardness of polishing abrasive is not the main factors to affect material removal.

Optimization of the Removal Function of Dual-Rotation Magnetorheological Finishing

2016 ◽  
Vol 874 ◽  
pp. 70-78 ◽  
Author(s):  
Yun Zhang ◽  
Zhi Jing Feng
Keyword(s):  
Spatial Frequency ◽  
Frequency Domain ◽  
Magnetorheological Finishing ◽  
Surface Error ◽  
Finishing Process ◽  
Psd Estimation ◽  
Dual Rotation ◽  
2D Fft ◽  
Surface Figure

Magnetorheological finishing (MRF) is an advanced polishing technique capable of rapidly converging to the required surface figure. In this article, dual-rotation MRF tool is used to generate centrosymmetric removal function that can be W-shaped or Gaussian-shaped. Using W-shaped removal function and Gaussian-shaped removal function respectively, this article compares the convergence of surface error by simulating the finishing process through iterative calculations. Furthermore, it compares mid-spatial-frequency surface error caused by the two removal functions, through 2D FFT and PSD estimation in the frequency domain. From simulation, this article proves that Gaussian-shaped removal function is more advantageous than W-shaped removal function. To solve the problem that the removal function obtained in dual-rotation MRF is W-shaped, this paper presents the method of adjusting the distance between the axes of self-rotation and co-rotation to secure Gaussian-shaped removal function. Finally, experiments have been conducted to demonstrate validity of the method.

Toward Magnetorheological Finishing of Magnetic Materials

2007 ◽  
Vol 129 (5) ◽  
pp. 961-964 ◽  
Author(s):  
Shai N. Shafrir ◽  
John C. Lambropoulos ◽  
Stephen D. Jacobs
Keyword(s):  
Magnetic Material ◽  
Surface Roughness ◽  
Magnetic Materials ◽  
Material Removal ◽  
Subsurface Damage ◽  
Magnetorheological Finishing ◽  
Optical Glasses ◽  
Material Surfaces ◽  
Finishing Process ◽  
Deformed Layer

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. Our approach is to place an MRF spot on machined surfaces of magnetic WC-Co materials. The resulting surface roughness is comparable to that produced on nonmagnetic materials. This spotting technique may be used to evaluate the depth of subsurface damage, or deformed layer, induced by earlier manufacturing steps, such as grinding and lapping.

scholarly journals Development of a New Finishing Process Combining a Fixed Abrasive Polishing with Magnetic Abrasive Finishing Process

Machines ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 81
Author(s):  
Yanhua Zou ◽  
Ryunosuke Satou ◽  
Ozora Yamazaki ◽  
Huijun Xie
Keyword(s):  
Alumina Ceramic ◽  
Ceramic Plate ◽  
Polishing Process ◽  
High Quality ◽  
Influence Of Process Parameters ◽  
Magnetic Abrasive Finishing ◽  
Nano Scale ◽  
Finishing Process ◽  
Abrasive Finishing ◽  
Fixed Abrasive

High quality, highly efficient finishing processes are required for finishing difficult-to-machine materials. Magnetic abrasive finishing (MAF) process is a finishing method that can obtain a high accuracy surface using fine magnetic particles and abrasive particles, but has poor finishing efficiency. On the contrary, fixed abrasive polishing (FAP) is a polishing process can obtain high material removal efficiency but often cannot provide a high-quality surface at the nano-scale. Therefore, this work proposes a new finishing process, which combines the magnetic abrasive finishing process and the fixed abrasive polishing process (MAF-FAP). To verify the proposed methodology, a finishing device was developed and finishing experiments on alumina ceramic plates were performed. Furthermore, the mechanism of the MAF-FAP process was investigated. In addition, the influence of process parameters on finishing characteristics is discussed. According to the experimental results, this process can achieve high-efficiency finishing of brittle hard materials (alumina ceramics) and can obtain nano-scale surfaces. The surface roughness of the alumina ceramic plate is improved from 202.11 nm Ra to 3.67 nm Ra within 30 min.

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