本文主要探討廣泛使用之7075-T651鋁合金，使用硬化AISI 52100軸承鋼珠擠光（Ball Burnishing）時之加工機制及製程參數的影響。擠光實驗利用CNC車床進行，以田口直交表實驗方法規劃不同參數組合，以了解各控制因子的不同參數水準對各品質特性的影響，並以多目標函數的方式評估各參數對表面粗糙度、真圓度及硬度這三種品質特性的綜效影響，作為改善7075-T651鋁合金擠光後表面品質的參考。
實驗結果顯示，7075-T651鋁合金擠光時影響表面粗糙度之最顯著因子為接觸壓力；潤滑油的種類則對真圓度及硬度的影響最大。以最適條件因子組合進行驗證實驗，可得到RZ=0.53μm及Ra=0.07μm的最佳表面粗糙度；對真圓度及硬度的改善幅度則超過30％，明顯改善表面品質。此外，從潤滑劑對擠光區域潤滑模式的影響，以及與接觸應力交互作用的機制，可得知最佳的擠光品質應位於邊界潤滑區。運用擠光因子的觀念，則可以在獲得相同表面品質的前提下，適度調配各控制因子的水準組合。

This paper used hardened AISI 52100 bearing steel as a tool for ball burnishing processes. In the burnishing process, as machining 7075- T651 Aluminum alloy work piece was burnished by the tool in order to get finishing surface. The ball burnishing is performed on a CNC turning center. The optimal parameters of surface roughness, roundness and hardness have been determined after conducting the Taguchi's L18 (matrix) experiments, respectively. Finally, the optimal burnishing parameters are obtained in accordance with multi-objective function. Experimental result shows that contact pressure is the most significant factors for surface roughness and lubricant is a significant factor for roundness and hardness. After burnishing processes, the surface roughness can achieve RZ=0.53 μm and Ra= 0.07 μm and its roundness and hardness can be improved over 30 %. From tribology concept, the best condition for burnishing process should be controlled under the boundary lubrication region. This research can help engineers acquire a satisfied surface for ball burnishing 7075- T651 aluminum alloy.

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