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

Author:

Huu Loc Pham1,Shiou Fang-Jung2,Yu Zong-Ru3,Hsu Wei-Yao4

Affiliation:

1. 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:

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

3. e-mail:

4. e-mail:  Instrument Technology Research Center, National Applied Research Laboratories, Hsinchu Science Park, 20, R&D Road VI, Hsinchu 300, Taiwan

Abstract

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.

Publisher

ASME International

Subject

Industrial and Manufacturing Engineering,Computer Science Applications,Mechanical Engineering,Control and Systems Engineering

Reference14 articles.

1. Fluid Jet Polishing of Optical Surfaces;Appl. Opt.,1998

2. Booji, S. M., 2003, “Fluid Jet Polishing Possibilities and Limitations of a New Fabrication Technique,” Ph.D. thesis, Technique University Delft, The Netherlands.

3. Optimization and Application of Influence Function in Abrasive Jet Polishing;Appl. Opt.,2010

4. The First Aspheric Form and Texture Results From a Production Machine Embodying the Precession Process;Proc. SPIE,2001

5. Novel CNC Polishing Process for Control of Form and Texture on Aspheric Surfaces;Proc. SPIE,2002

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