本論文研究主要目的為開發一可安裝於三軸、五軸CNC加工中心機之新型內建荷重元拋光工具，並以自製拋光橡膠體，對擠光加工後施以常壓電漿氮化硬化之STAVAX不鏽模具鋼平面試件進行表面拋光精加工處理，探討其表面粗糙度及硬度之改善。
新型拋光工具有可替換式之夾治具機構設計，依實驗需求，可搭配自製內含氧化鋁粉之拋光球或拋光柱進行加工，將先期研究建議之擠光及拋光參數應用於自由曲面試件，可使擠光加工後之表面粗糙度由Ra 1.07 µm改善至Ra 0.11 µm；再經拋光加工後之表面粗糙度則可改善至Ra 0.05 µm，由以上結果驗證了機構之可靠性。
本研究為探討拋光磨料濃度對於表面粗糙度之影響，將自製拋光橡膠體之氧化鋁粉含量由先期研究之20%提升至30%，並參考先期研究建議之拋光參數應用於平面試件，經實驗證明，氧化鋁粉濃度提升後之拋光膠體，可使試件表面粗糙度結果相較濃度提升前之結果改善約19%。
本研究參考先期研究最佳擠光參數組合，可使平面試件之表面粗糙度由Ra 0.22 µm降至Ra 0.056 µm；再經由常壓電漿氮化硬化製程，使試件表面硬度由392 HV上升至513 HV，而試件表面粗糙度也因此上升至Ra 0.15 µm；最後利用田口實驗設計法，以直徑20 mm拋光柱，得建議拋光參數組合為：粒徑0.5 µm、拋光力7.78 N、進給率0.1 mm/min、轉速7000 rev/min，經拋光後之平面試件表面粗糙度可降低至Ra 0.08 µm，改善47 %之表面粗糙度值。

This research aims to develop a new polishing tool embedded with a load cell that can be installed either on a three-axis or a five-axis CNC machining center. Surface polishing finishing process was conducted by using the lab-made cylindrical-shaped polishing rubber on the planar workpiece of STAVAX stainless mold steel, which has been hardened by the Atmospheric Pressure Plasma Jet Nitriding after burnishing, to investigate the improvement on the surface roughness and hardness.
The new polishing tool consists of a replaceable clamping fixture mechanism design. According to different experimental requirements, either the lab-made polishing balls or the cylindrical-shaped polishing rubber containing aluminum oxide abrasive can be used for the polishing process. To validate the reliability of the developed mechanism, the burnishing and polishing parameters proposed in the previous research have been applied to do the surface finishing of the freeform surfaces, resulted in an improvement of surface roughness from Ra 1.07 µm to Ra 0.11 µm after burnishing process, and further improved to Ra 0.05 µm after the polishing process.
To investigate the effect of the abrasive concentration on the surface roughness improvement, the alumina powder content in the lab-made polishing rubber was increased from 20% to 30%. Applying the polishing parameters proposed in the previous research to the planar workpiece, the increased concentration of the abrasive within the polishing rubber resulted in an improvement of about 19% on the surface roughness, according to the experimental results.
This research referred to the optimal burnishing parameters proposed in the previous research, the surface roughness of the planar workpiece was improved from Ra 0.22 µm to Ra 0.056 µm. Subsequently, through the Atmospheric Plasma Jet Nitriding process, the surface hardness was increased from 392 HV to 513 HV. However, the surface roughness of the workpiece was increased to Ra 0.15 µm. Utilizing the Taguchi experimental design method for a cylindrical-shaped polishing tool with a diameter of 20 mm, the optimal polishing parameters combination were determined as follows: particle size 0.5 µm, polishing force 7.78 N, feed rate 0.1 mm/min, and rotating speed 7,000 rev/min. After the polishing process, the surface roughness of the planar workpiece was improved to Ra 0.08 µm, achieving a 47% improvement on the surface roughness.

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