Research on the Surface Finish of Al-6061T6 on a CNC Machining Center

• Main Authors: WU-TSUNG WEI, 吳聰維
• Other Authors: Fang-Jung Shiou
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/j45y47

碩士 === 國立臺灣科技大學 === 機械工程系 === 105 === The objective of this research is to develop a ball burnishing and ball polishing surface finish process on a three-axis and five-axis CNC machining center, respectively, to improve the surface roughness of Al-6061T6. The optimal plane surface ball burnishing and ball polishing parameters have been determined by conducting the Taguchi’s L9 matrix experiments, ANOVA analysis, and the verification experiments, respectively. The determined optimal ball burnishing parameters were as follows: the burnishing force of 90 N, the feed rate of 300 mm/min, the step over of 20 μm. The surface roughness of the flat specimens could be improved from Ra 0.8μm to Ra 0.22μm by using the determined optimal ball burnishing parameters. The optimal ball polishing parameters were as follows: the spindle speed of 12,000 rpm, the feed rate of 40 mm/min, the step over of 40 μm, the depth of penetration of 90 μm (1N). The surface roughness of the flat burnished specimens could be improved from Ra 0.22μm to Ra 0.14μm. Finally, the optimal ball burnishing and ball polishing parameters were applied to a 3D aspherical surface by using three-axis and five-axis CNC machining center, respectively. The difference of surface roughness between the three-axis process and the five-axis process has been investigated. The improvement of the surface roughness was better by using the five-axis process compared with the three-axis process.