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Research Papers

Investigation of Optimal Air-Driving Fluid Jet Polishing Parameters for the Surface Finish of N-BK7 Optical Glass

[+] Author and Article Information
Pham Huu Loc

Department of Mechanical Engineering,
National Taiwan University of
Science and Technology,
No. 43, Sec. 4, Keelung Road,
Taipei 106, Taiwan;
Department of Mechanical Engineering,
Tuy Hoa Industrial College,
Ward 8, Tuy Hoa City,
56000 Phu Yen Province, Viet Nam
e-mail: loccdcnth@yahoo.com

Fang-Jung Shiou

Department of Mechanical Engineering,
National Taiwan University of
Science and Technology,
No. 43, Sec. 4, Keelung Road,
Taipei 106, Taiwan
e-mail: shiou@mail.ntust.edu.tw

Zong-Ru Yu

e-mail: jungru@itrc.narl.org.tw

Wei-Yao Hsu

e-mail: hsuweiyao@itrc.narl.org.tw
Instrument Technology Research Center,
National Applied Research Laboratories,
Hsinchu Science Park,
20, R&D Road VI,
Hsinchu 300, Taiwan

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the Journal of Manufacturing Science and Engineering. Manuscript received July 26, 2012; final manuscript received January 2, 2013; published online January 25, 2013. Assoc. Editor: Donggang Yao.

J. Manuf. Sci. Eng 135(1), 011015 (Jan 25, 2013) (7 pages) Paper No: MANU-12-1223; doi: 10.1115/1.4023368 History: Received July 26, 2012; Revised January 02, 2013

The aim of this study is to investigate optimal air-driving fluid jet polishing (FJP) parameters by using Taguchi's method to improve surface roughness of N-BK7 optical glass on a machining center. An orthogonal array and the signal-to-noise (S/N) ratio are employed to determinate the optimal polishing parameters, and analysis of variance (ANOVA) is used to identify the main parameters that affect the surface roughness of the N-BK7 optical glass. An air-driving FJP tool is newly designed and fabricated to conduct experiments. To determinate the optimal air-driving FJP parameters, six polishing parameters, namely air pressure, impact angle, standoff distance, the abrasive material, abrasive concentration, and polishing time, are selected as the control factors of experiments. Based on the Taguchi's L18 orthogonal array experimental results and the S/N ratio, the optimal parameters for the N-BK7 optical glass are found. These optimal parameters are to be as follows: an air pressure of 0.490 MPa, an impact angle of 40 deg, a standoff distance of 12 mm, the abrasive material of Al2O3, an abrasive concentration of 10 wt. %, and a polishing time of 30 min. The surface roughness of specimen is improved from Ra = 0.350 μm–0.032 μm by using the optimal air-driving FJP parameters. In addition, the determined optimal polishing parameters for the plane surface are applied to the surface finish of an N-BK7 spherical lens, and the surface roughness of the spherical lens can be improved from Ra = 0.421 μm to 0.202 μm within an area of 283.6 μm × 200 μm.

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Figures

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Fig. 1

The process to determine optimal parameters of the air-driving FJP

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Fig. 2

Schematic diagram of the air-driving FJP

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Fig. 3

Photo of the developed air-driving FJP tool

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Fig. 4

Experimental setup for air-driving FJP

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Fig. 5

The plots of the control factor effects in the air-driving FJP

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Fig. 6

Color 3D laser scanning microscope images of (a) a ground surface and (b) a polished surface

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Fig. 7

Influence of air pressure on the polished surface roughness

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Fig. 8

Influence of polishing time on the polished surface roughness

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Fig. 9

Influence of impact angle on the polished surface roughness

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Fig. 10

The spherical lens model with radius of curvature R = 400 mm

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Fig. 11

Photo of a ground surface and polished surface on the N-BK7 spherical lens

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Fig. 12

A 3D surface roughness topography of a ground surface

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Fig. 13

A 3D surface roughness topography of a polished surface

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