研究生: |
邱泓翔 Hong-Siang Ciou |
---|---|
論文名稱: |
以振動式球拋光製程作鏡面不銹鋼之自動化表面精加工研究 Automated Surface Finish of Mirror-Like Stainless Steel Using Vibrated Spherical Polishing Process |
指導教授: |
修芳仲
Fang-Jung Shiou |
口試委員: |
黃緒哲
Shiuh-Jer Huang 陳炤彰 Chao-Chang Chen |
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: | 2006 |
畢業學年度: | 94 |
語文別: | 中文 |
論文頁數: | 155 |
中文關鍵詞: | 振動式球拋光 、表面粗糙度 、壓電致動器 、球擠光 |
外文關鍵詞: | vibrated spherical polishing, surface roughness, piezoelectric actuator, ball burnishing |
相關次數: | 點閱:439 下載:7 |
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本論文為於CNC切削中心機上發展自動化振動式球拋光製程。以田口實驗計劃法對STAVAX塑膠模具用鏡面不銹鋼找出球擠光與振動式球拋光最佳參數,另針對振動式與無振式拋光棒磨耗改善進行討論,將最佳參數應用於經逆向工程建構之3D自由曲面,以得知3D自由曲面表面粗糙度改善情況。
研究中以L9與L18直交表進行擠光與振動式球拋光實驗,以探討各加工參數對於表面粗糙度影響,並找出最佳加工參數,其中振動式球拋光是以壓電致動器產生微幅振動,並以單軸振動加工參數改善拋光加工時拋光棒使用壽命問題。經實驗結果得知最佳球擠光加工參數為:擠光力500 N、進給200 mm/min、間距20 μm與擠光道次1次。最佳振動球拋光加工參數為:拋光道次1次、轉速12000 rpm、間距20 μm、磨料粒徑0.5 μm、振幅50 μm、拋光棒直徑8 mm、拋光液比例1: 20與振動頻率800 Hz、進給100 mm/min。先後利用平面擠光與平面振動式拋光加工製程,可得到擠光加工後表面粗糙度為Ra 0.102 μm,經振動式拋光加工後其表面粗糙度值為Ra 0.031 μm (Rmax 0.341 μm),而無振式拋光加工其表面粗糙度值為Ra 0.027 μm(Rmax 0.280 μm)。
拋光棒體積磨耗改善率為71.934 %。表示振動加工可降低拋光棒磨耗,有效延長拋光棒壽命。將最佳參數應用於F-theta自由曲面上其振動式拋光表面粗糙度值Ra 0.0224 μm (Ry 0.200 μm),無振式拋光表面粗糙度值Ra 0.0216 μm (Ry 0.215 μm)。應用於非球面鏡片自由曲面上振動式球拋光表面粗糙度值Ra 0.0296 μm (Ry 0.26 μm)。
The objective of this research is to develop a vibrated spherical polishing system assisted by a piezoelectric actuator on a machining center, in order to improve the surface roughness of STAVAX plastic mold stainless steel and to reduce the volume wear of the polishing ball. The optimal plane surface ball burnishing and vibrated spherical polishing parameters have been determined after conducting the Taguchi’s L9 and L18 matrix experiments. The optimal plane polishing parameters for the STAVAX plastic mold stainless steel were the combination of the polishing times of 1, the polishing speed of 12,000 rpm, the abrasives of aluminum oxide(Al2O3) with grid diameter of 0.5 μm, slurry concentration of 1:20, the feed of 100 mm/min, stepover distance of 20 μm, the depth of penetration of 50 μm, and vibration frequency of 800 Hz. The surface roughness of the test specimens colud be improved from about Ra 0.531 μm to Ra 0.102 μm in average using the optimal plane surface ball burnishing parameters. The surface roughness of the burnished specimen can be further improved to Ra 0.031 μm(Rmax 0.341 μm) using the optimal plane surface vibrated spherical polishing process, and Ra 0.027 μm (Rmax 0.280 μm) using the optimal plane surface polishing process with no vibration . The improvement of volume wear of the polishing ball was about 72 % using the vibrated polishing process compared with the non-vibrated polishing process. Applying the optimal plane surface ball burnishing and vibrated spherical polishing parameters sequentially to a fine milled freeform surface carrier of a F-theta scan lens, the surface roughness of Ra 0.0224 μm (Ry 0.200 μm) on the freeform surface is obtainable,and Ra 0.0216 μm (Ry 0.215 μm) using polishing process with no vibration. Applying the optimal plane surface ball burnishing and vibrated spherical polishing parameters sequentially to a fine milled carrier of an aspherical lens surface, the surface roughness of Ra 0.0296 μm (Ry 0.26 μm) on the freeform surface is obtainable.
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