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研究生:紀盈州
研究生(外文):ying chow chi
論文名稱:三維彈性夾具系統之研究
論文名稱(外文):A study on 3-D flexible fixturing system
指導教授:呂秀雄呂秀雄引用關係
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:機械工程學研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2001
畢業學年度:89
語文別:中文
中文關鍵詞:複雜的曲面外型彈性夾具系統半球型的夾頭等高夾持剖面有效夾持解重力位能越低越穩定座標量測功能加工控制碼
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隨著產品的多樣化,以及近來對產品外型之強調,因此產品大多具有複雜的曲面外型。本研究鑑於此因,發展出一套可快速夾持具複雜曲面而底面不為平面的彈性夾具系統,並可獲得夾持後工件在夾具之相對位置。本系統在夾持機構上係採用半球型的夾頭,能依工件的外型自動調整旋轉,進而確實貼緊工件。本文利用夾頭之等高夾持剖面將三維工件的夾持分析簡化為二維模式。而夾具夾持法討論的模式只探討如何將底部倒三角錐工件部份求出其有效夾持解並利用重力位能越低越穩定的觀念,求取理論穩定夾持解。接著用底下三個半球型夾頭將底部倒三角錐工件加以精確的定位並完成夾持後,利用上層的四個夾頭加以夾緊不規則曲面工件部份以利工件加工。
最後經由實際的加工測試,證明了本文之彈性夾具,對於具有曲面與斜面但底面不為平面的工件,擁有強大的夾持能力。其更具有座標量測功能,因此可藉由比對而得知工件的方位,然後進行座標轉換,修改加工控制碼,最後進行加工

Due to diversity of products, and emphasis on external shape, often products involve complicated surfaces.For this reason, this thesis is mainly concerned with developing a flexible fixturing system that can quickly grasp parts with curved surfaces that are not flat planes in the bottom.In addition, it can also acquire relative positions of the grasped part. With hemispherical grasping elements, this fixturing system can automatically adjust, according to the shapes, to firmly fix workparts. When cross-sections of grasping elements are being used, the grasp analysis of 3-D workparts can be simplified to 2-D mode. This thesis only studies how to find grasping ways of pyramid workparts, and uses the concept of lowerst potential energy to find the optimum configuration.
From tests, this system is found to be satisfied for parts with curved faces that are not flat planes in the bottom. It is also capable of automatic determination of the corresponding location and the orientation of fixtured workpieces. Through the transformation of coordinates, the NC codes can be modified.

頁次
中文摘要.....................................................................................................I
英文摘要....................................................................................................II
目錄...........................................................................................................III
圖表目錄....................................................................................................V
符號說明..............................................................................................XIII
第一章 緒 論............................................................................................1
1.1研究動機..............................................................................1
1.2文獻回顧..............................................................................2
1.3論文總覽.............................................................................5
第二章 三維夾持彈性夾具系統..............................................................6
2.1系統硬體架構.....................................................................6
2.1.1夾具本體的特色簡介.............................................6
2.1.2三維夾持彈性夾具之設計.....................................8
2.1.2.1夾具本體構成........................................10
2.1.3 夾具夾持限制..................................................................16
2.2夾具系統之使用流程........................................................18
第三章 夾具夾持法................................................................................20
3.1介紹................................................................................... 20
3.2量測變數定義與說明........................................................21
3.3有效夾持解求法................................................................22
3.3.1夾持原理................................................................23
3.3.2有效夾持法求解過程............................................24
3.3.3理論穩定夾持解…………………………………28
3.3.4穩定解之計算結果................................................29
第四章 工具機控制碼轉換系統............................................................33
4.1工具機控制碼轉換系統...................................................33
4.1.1座標轉換...............................................................33
4.1.2控制碼轉換...........................................................35
4.2夾持比對方法...................................................................37
第五章 實例驗證與討論........................................................................38
5.1實驗設備...........................................................................38
5.2夾持實驗步驟...................................................................39
5.3夾持實驗結果與討論.......................................................40
5.4實際工具機加工模擬.......................................................43
第六章 結論與展望................................................................................46
參考文獻..................................................................................................49
附錄A 夾具本體零件表...........................................................................53
附錄B 工件加工面與基板保持水平之方法示意圖………………… 57

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