本論文研究目的為在CNC車床上對Al-6061T6鋁合金進行球擠光、球拋光等表面精加工研究。本研究以田口實驗計畫法找出球擠光與球拋光的最適參數組合以獲得最佳的表面粗糙度，並將圓柱面最適參數應用於錐度試件，以觀察表面粗糙度改善情況。
本研究的球擠光與球拋光實驗皆採用田口L9直交表進行，藉由S/N Ratio及變異數分析(ANOVA)探討各參數對表面粗糙度的影響，進而求得最適表面粗糙度的加工參數組合。經由實驗結果得到的最適球擠光參數組合為：擠光力60 N，進給率0.05 mm/rev，主軸轉速180 rpm，使用機油(cst68 @ 40ﾟC)作為潤滑油，可使表面粗糙度由Ra 1.0 μm改善至Ra 0.147 μm；球拋光最適參數組合為：壓深100 μm，進給率0.02 mm/rev，研磨棒轉速15,000 rpm，主軸轉速60 rpm，可得表面粗糙度Ra 0.097 μm。
以圓柱面最適球擠光、球拋光參數組合對錐度試件進行應用，拋光後表面粗糙度Ra約為0.09 μm。

The purpose of this research is to study the surface finishing processes on the CNC turning machine for Al-6061T6, to improve its surface roughness. In order to improve surface roughness, the Taguchi’s L9 matrix experiments have been carried out to determine the suitable combination of the process parameters. By using S/N Ratio, the ANOVA analysis and the verification tests, the appropriate ball burnishing and ball polishing process parameters have been determined. According to the experimental results, the determined appropriate ball burnishing parameters were as follows : burnishing force of 60 N, feed rate of 0.05 mm/rev, spindle speed of 180 rpm and use of machine oil (cst68 @ 40ﾟC) as lubricant. The turned surface roughness of the test specimen could be improved from Ra 1.0 μm to Ra 0.147 μm. The appropriate ball polishing parameters were as follows : depth of penetration of 100 μm (1.59N), feed rate of 0.02 mm/rev, polishing speed of 15,000 rpm and spindle speed of 60 rpm. The burnished surface roughness could be improved from Ra 0.147 μm to Ra 0.097 μm. Applying these suitable parameters to the taper workpiece, the surface roughness of Ra 0.09 μm could be obtained.

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