Automated Surface Finish of Mirror-Like Stainless Steel Using Vibrated Spherical Polishing Process

• Main Authors: Hong-Siang Ciou, 邱泓翔
• Other Authors: Fang-Jung Shiou
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/8ef8z6

碩士 === 國立臺灣科技大學 === 機械工程系 === 94 === The objective of this research is to develop a vibrated spherical polishing system assisted by a piezoelectric actuator on a machining center, in order to improve the surface roughness of STAVAX plastic mold stainless steel and to reduce the volume wear of the polishing ball. The optimal plane surface ball burnishing and vibrated spherical polishing parameters have been determined after conducting the Taguchi’s L9 and L18 matrix experiments. The optimal plane polishing parameters for the STAVAX plastic mold stainless steel were the combination of the polishing times of 1, the polishing speed of 12,000 rpm, the abrasives of aluminum oxide(Al2O3) with grid diameter of 0.5 μm, slurry concentration of 1:20, the feed of 100 mm/min, stepover distance of 20 μm, the depth of penetration of 50 μm, and vibration frequency of 800 Hz. The surface roughness of the test specimens colud be improved from about Ra 0.531 μm to Ra 0.102 μm in average using the optimal plane surface ball burnishing parameters. The surface roughness of the burnished specimen can be further improved to Ra 0.031 μm(Rmax 0.341 μm) using the optimal plane surface vibrated spherical polishing process, and Ra 0.027 μm (Rmax 0.280 μm) using the optimal plane surface polishing process with no vibration . The improvement of volume wear of the polishing ball was about 72 % using the vibrated polishing process compared with the non-vibrated polishing process. Applying the optimal plane surface ball burnishing and vibrated spherical polishing parameters sequentially to a fine milled freeform surface carrier of a F-theta scan lens, the surface roughness of Ra 0.0224 μm (Ry 0.200 μm) on the freeform surface is obtainable,and Ra 0.0216 μm (Ry 0.215 μm) using polishing process with no vibration. Applying the optimal plane surface ball burnishing and vibrated spherical polishing parameters sequentially to a fine milled carrier of an aspherical lens surface, the surface roughness of Ra 0.0296 μm (Ry 0.26 μm) on the freeform surface is obtainable.