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博碩士論文 etd-0720109-183522 詳細資訊
Title page for etd-0720109-183522
論文名稱
Title
適用於軸對稱自由曲面的點拋光刀具系統之設計研究
A study of point-contact polishing tool system design for axially symmetric free surface
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
135
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2009-07-07
繳交日期
Date of Submission
2009-07-20
關鍵字
Keywords
拋光、CNC工具機、自由曲面、組裝誤差、有限元素法
finite element method, assembly errors, polishing, free surface, CNC machine
統計
Statistics
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The thesis/dissertation has been browsed 5661 times, has been downloaded 2 times.
中文摘要
  本論文的主要目的在於發展出多套創新的拋光刀具系統之硬體架構,此拋光系統可加裝在CNC工具機上,並且可以用來拋光軸對稱自由曲面工件,經由形狀誤差補償策略,可將工件上的形狀誤差精準的移除,因而提升加工精度。論文中將利用一套邏輯思考的方法,針對擬定的設計目標,將問題逐步拆解,希望透過此思考策略得到多種可行的設計方案。然後,應用ANSYS(有限元素法分析軟體)去探討系統的剛性特性,建立結構剛性及界面剛性與刀具偏移之間的關係。除此之外,利用齊次座標轉換建立系統的運動順向誤差模型,分析組裝誤差對於刀具偏移的影響。本論文發展出兩套創新的拋光刀具系統。且經由模擬可得知,刀具的偏移是被系統的某些結構及界面剛性所主導;刀具的偏移也會因系統的組裝誤差受到明顯的影響,進而提出一套可做誤差補償的組裝策略。
Abstract
The goal of this thesis is to develop a novel polishing tool system. This system can be attached to a CNC machine and execute a precision polishing job mainly for an axially symmetric free surface. The precision polishing job is to remove the error surface profile on the work to improve its form precision, which was left by the previous machining process. An inferential rule, which was based on a top-down planning strategy, was utilized to gradually decompose the design goals of the tool system to facilitate the process for generating all of the possible design proposals. The major design goal is to render all the rotational axes of the tool system to exactly intersect at the tool center. To analyze the effects of the structure and interface stiffness of tool system on the major goal, the finite element method was adopted. Further, the homogeneous transformation scheme is applied to establish the forward kinematic error of the designed system and to analyze the effect of different manufacturing and assembly errors on the major goal.Accordingly, two novel polishing tool systems were developed. The simulation study indicated that the total errors after assembly at the tool center and the two rotation axes were dominated by the stiffness at the interfaces of the tool system, in addition to the influence of structure stiffness. An assembly strategy was then proposed in the study to reduce the total error.
目次 Table of Contents
謝誌 I
目錄 II
圖索引 IV
表索引 VII
中文摘要 VIII
Abstract IX
第一章 緒論 1
1.1 研究動機與方法 1
1.2 拋光與精密加工 5
1.2.1 拋光的特性 5
1.2.2 拋光的優點 6
1.2.3 現有拋光法之回顧 6
1.3 內容介紹 7
第二章 液動壓拋光法簡介 8
2.1 液動壓拋光法 8
2.2 液動壓拋光之點、線、面拋光特性簡介 10
2.3 拋光系統之概念設計 12
第三章 拋光刀具系統之硬體設計 14
3.1 刀具系統之機構設計 14
3.1.1 滿足曲面拋光之機構設計 14
3.1.2 滿足抑制刀具磨耗之機構設計 17
3.1.3 滿足刀具運動模式之機構設計 20
3.1.4 刀具系統之最終外型 21
3.2 負載控制系統設計 22
3.3 整體系統運動模式 23
第四章 剛性分析 25
4.1 模擬方法之建立 25
4.2 結構剛性分析 27
4.3 界面剛性分析 29
第五章 組裝誤差分析 32
5.1 座標轉換 32
5.1.1 齊次座標轉換 32
5.1.2 D-H變換矩陣及修正型D-H變換矩陣 34
5.2 誤差模型的建立與靈敏度分析 35
5.3 誤差參數之運動分析 37
5.4 組裝模擬分析 38
5.4.1 尺寸鏈原理 39
5.4.2 尺寸鏈的建立 40
5.4.3 公差分析 43
5.5 組裝方法設計 44
5.5.1 量測方法 45
5.5.2 調整方式 46
第六章 討論 48
第七章 結論與未來展望 52
參考文獻 55
參考文獻 References
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