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	Magnetorheological finishing of SiC aspheric mirrors
	Cheng, HB ; Feng, ZJ ; Wang, YW ; Lei, ST
	2010-05-10 ; 2010-05-10
关键词	aspheric mirror gap magnetization pressure magnetorheological finishing reaction-bonded silicon carbide removal function OPTICAL FABRICATION SURFACES SMOOTH AXIS Engineering, Manufacturing Materials Science, Multidisciplinary
中文摘要	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 coefficient. Thus, in order to rapidly manufacture high-precision aspherical mirrors made from RB-SiC, a novel aspheric manufacturing system equipped with magnetorheological finishing (MRF) technology is described in this paper, which incorporates a host of features and has unprecedented processing versatility. The system has four degrees of freedom, and can realize manufacture or measurement based on the Cartesian coordinate or polar coordinate systems. To achieve good surface accuracy, the polishing wheel combines self-rotation movement with corotation. The prepolishing and fine polishing processes can be done on the same machine by changing different process parameters accordingly, and the on-machine profilometer measures the aspheric forms generated during prepolishing. Experiments were carried out on the features of magnetorheological (MR) fluids by polishing a parabolic SiC mirror with a Phi 100 mm aperture. The results indicated that the required convergence speed, surface roughness, and figure accuracy can be achieved with high efficiency. The final surface roughness with an initial value of Ra = 34.39 nm reached 26.74 nm after 20 hours of prepolishing using MR fluids carrying oil (Al2O3 as the nonmagnetic particle), and then reached 1.14 nm after 50 hours of fine polishing using the MR fluid with diamond power as the nonmagnetic particle. The figure accuracy also improved to lambda 130 rms (lambda = 632.8 nm) at an arbitrary Phi 30 mm subaperture.
语种	英语 ; 英语
出版者	TAYLOR & FRANCIS INC ; PHILADELPHIA ; 325 CHESTNUT ST, SUITE 800, PHILADELPHIA, PA 19106 USA
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/25093]
专题	清华大学
推荐引用方式 GB/T 7714	Cheng, HB,Feng, ZJ,Wang, YW,et al. Magnetorheological finishing of SiC aspheric mirrors[J],2010, 2010.
APA	Cheng, HB,Feng, ZJ,Wang, YW,&Lei, ST.(2010).Magnetorheological finishing of SiC aspheric mirrors..
MLA	Cheng, HB,et al."Magnetorheological finishing of SiC aspheric mirrors".(2010).

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