研究生: |
潘建男 Jian-Nan Pan |
---|---|
論文名稱: |
自製內含氧化鋁粉橡膠球作STAVAX不鏽模具鋼之自動化表面精加工研究 Automated Surface Finish of STAVAX Stainless Mold Steel Using Rubber Polishing Ball Containing Alumina Powder |
指導教授: |
修芳仲
Fang-Jung Shiou |
口試委員: |
修芳仲
Fang-Jung Shiou 郭俊良 Chun-Liang Kuo 鍾俊輝 Chun-Hui Chung 吳昌謀 Chang-Mou Wu |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2018 |
畢業學年度: | 106 |
語文別: | 中文 |
論文頁數: | 116 |
中文關鍵詞: | 球擠光 、超音波球拋光 、橡膠球拋光 、五軸拋光 |
外文關鍵詞: | Ball burnishing, Ultrasonic ball polishing, Rubber polishing ball, Five-axis CNC machining center |
相關次數: | 點閱:234 下載:1 |
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本論文研究目的為於三軸、五軸CNC切削中心機上發展自動化拋光製程輔以自製內含氧化鋁粉之橡膠拋光球,以此對STAVAX鏡面模具鋼找出球拋光最佳道次組合,並將此最佳參數應用於經NX10.建構之鞍型面以及凸型面,以探討自由曲面表面與2D平面試件粗糙度改善情況。
研究中沿用先期研究擠光之進給率以及間距(20),並重新找尋最佳擠光力以及最佳橡膠拋光球之道次組合以探討各加工參數對於表面粗糙度影響;其中超音波拋光是以壓電陶瓷換能器產生微幅震動,並以Z軸震動加工參數改善拋光加工時拋光棒使用壽命問題。經實驗結果得最佳球擠光加工參數為:擠光力80N、進給300mm/min、間距30μm,可使試件表面粗糙度改善由Ra 0.13 μm至Ra 0.042 μm。最佳超音波球拋光加工參數為:振幅10μm、頻率23KHz、轉速5000rpm、進給60mm/min、間距20μm、壓深180μm、拋光道次氧化鋁粉粒徑濃度組合:E粗拋3μm (40%)-C中拋1μm (30%)-B中拋0.3μm (20%)-A細拋0.05μm(20%)、 潤滑液比例1:20,可使試件表面粗糙度改善至
Ra 0. 023 μm。
本研究將所得最佳球擠光與超音波拋光參數應用於鞍型面以及凸型面後,無超音波拋光可得表面粗糙度皆為Ra 0.04 μm,超音波拋光皆可達Ra 0.03 μm。並以橡膠拋光球與羊毛氈球做磨耗比對。
The objective of this research is to develop an automated polishing process with homemade rubber polishing ball containing alumina powder on a three-axis and five-axis CNC machining center. The determined best pass combination of ball polishing for STAVAX mold stainless steel, and the best parameters have been applied to the saddle and convex surfaces constructed by NX10, to investigate the roughness improvement on the 2D plane and the free-form surface.
In this research, using the feed rate and stepover based on the previous study, that the appropriate burnishing force that affects the roughness and the best combination of polishing balls have been determined, to investigate the effect of various processing parameters on surface roughness. The determined optimal burnishing parameters were as follows: the burnishing force of 80 N, the feed rate of 300 mm/min, the stepover of 30 μm. The surface roughness of the test specimens could be improved from Ra 0.13 μm to Ra 0.042 μm, using the determined optimal burnishing parameters. The optimal ultrasonic vibration-assisted polishing parameters were as follows: the amplitude of 10μm, the frequency of 23 KHz, the spindle speed of 5,000 rpm, the feed rate of 60 mm/min, the stepover of 20 μm, the depth of penetration of 180 μm, the polishing pass of E-C-B-A, based on the experimental results. The surface roughness of the polished test specimens could be improved from the milled surface roughness Ra 0.13 μm to Ra 0.023 μm.
Applying the optimal plane surface ball burnishing and vibration-assisted spherical polishing parameters sequentially to a fine milled and burnished saddle and convex surface, the surface roughness of Ra 0.03 μm was obtainable, whereas the surface roughness was Ra 0.04 μm using the polishing process with no ultrasonic vibration. The wear comparison between rubber polishing ball and the wool ball has been made.
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