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研究生:彭啟明
研究生(外文):Chi-ming Peng
論文名稱:銑削動態力與工具機空間誤差對加工件尺寸誤差之影響
論文名稱(外文):The Effects of Dynamic Milling Force and Spatial Errors of Machine Tool on Workpiece Dimensional Errors
指導教授:王俊志
指導教授(外文):Jiunn-jyh Wang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:機械工程學系碩博士班
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:2009
畢業學年度:97
語文別:中文
論文頁數:82
中文關鍵詞:平行度尺寸誤差工具機空間誤差銑削動態力
外文關鍵詞:dimensional errorsparallelismdynamic milling forcespatial errors of machine tool
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  • 被引用被引用:3
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  • 下載下載:127
  • 收藏至我的研究室書目清單書目收藏:0
銑削製程中,除工具機空間定位誤差外,因切削力所產生刀具偏移之製程誤差亦是影響工件尺寸誤差之重要因素。由於精密微機械系統功能需求日益嚴苛,對微型加工機與加工件之精度要求均需同時提升,為能更精確預測加工件尺寸或藉由加工件尺寸誤差評估微型工具機之空間誤差,同時考慮並掌握工具機空間誤差與製程誤差對尺寸誤差之影響實為一重要之課題。
本論文旨在探討銑削動態力與工具機空間誤差對加工件尺寸誤差之影響。研究利用銑削力捲積模式,引入表面生成窗之概念,獲得加工面產生時之動態銑削力與刀具偏擺,並藉由刀具與工件綜合剛性計算出製程誤差後,再結合工具機空間誤差,完成加工件尺寸誤差之預測模式。在兩不同構型工具機上實驗結果發現此模式除了可正確預測尺寸誤差外,更提供一能準確評估工具機空間誤差之方法。此外,本研究更進一步分析探討銑削動態力變異、刀具偏擺變異、工具機空間誤差變異與加工件尺寸誤差變異之關係,實驗結果顯示銑削力變異為產生加工件尺寸誤差變異之主因。最後,利用本論文結合尺寸誤差及變異分析之結果成功預測銑削加工面之平行度。
Except the spatial errors of machine tool, the force-induced tool displacement is also an important factor related to the workpiece dimensional error in milling process. As the demands for the functions of micro-machine system are increasing, the accuracy of micro-machine tool and workpiece must be upgrade to a higher level simultaneously. Furthermore, in order to accurately predict the workpiece dimensional errors and measured the machine tool spatial error by means of the workpiece dimensional errors, considering and handling the spatial errors of machine tool and process errors in the same time are important and necessary task.
The workpiece dimension error model comprising of the spatial errors of machine tool and process errors in milling process is presented in this thesis. The spatial errors of machine tool are analyzed by vector method with Laser Doppler Displacement Measurement (LDDM). The important factors of process errors considered in this model include the dynamic milling force, tool stiffness, workpiece stiffness and tool runout. The surface generation window is proposed on the basis of chip width density function of convolution modeling method to relate the generation of workpiece surface to the dynamic milling force. This model not only predicts workpiece dimensional accuracy, but also serves as a new tool to calculate spatial errors of machine tool. Moreover, the effects of all the parametric variance of this model are investigated. It is shown that the dimensional error is most affected by the variance of the dynamic milling force. Finally, the parallelism of the machined surface is shown to be accurately predicted by combining the workpiece dimensional error model and variance analysis.
摘要 I
Abstract II
誌謝 III
目錄 IV
表目錄 VII
圖目錄 VIII
符號說明 XI
第一章 緒論 1
1.1 前言 1
1.2 文獻回顧 2
1.3 研究動機與目的 5
1.4 研究範疇與架構 5
第二章 銑削力分析模式 8
2.1 前言 8
2.2 銑削座標系統 8
2.3 角度域(angular domain)的銑削力 12
2.3.1基本切削函數(elementary cutting function) 12
2.3.2 屑寬密度函數(chip width density function) 13
2.3.3 刀刃序列函數 15
2.3.4 角度域總銑削力 15
第三章 加工件尺寸誤差與其變異預測 18
3.1 前言 18
3.2 加工件尺寸誤差模式之建立 19
3.2.1 刀具受力位移分析 21
3.2.2 工件受力位移分析 24
3.2.3 刀具偏擺分析 25
3.3 加工件尺寸誤差變異模式之建立 25
第四章 工具機空間誤差測量與分析 30
4.1 前言 30
4.2 工具機空間誤差模式 30
4.3 雷射對角線量測 40
4.4 量測儀器架設 44
4.5 工具機空間誤差分析 46
第五章 實驗方法與結果討論 50
5.1 前言 50
5.2 實驗材料 50
5.3 實驗設備與儀器 51
5.3.1 銑削使用之銑床規格 51
5.3.2 實驗儀器及其規格 51
5.4 實驗方法說明 52
5.4.1 實驗儀器架設 52
5.4.2 實驗前準備工作 53
5.5 刀具剛性(Kt)、工件剛性(Kw)與綜合剛性(K)之量測 54
5.6 刀具偏擺之量測 58
5.7 加工件尺寸誤差之量測 60
5.8 實驗結果 61
5.9分析討論 68
第六章 結論與建議 74
6.1 結論 74
6.2 建議 75
參考文獻 76
附錄 78
自述 82
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