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研究生:林冠宇
研究生(外文):Lin, Guanyu
論文名稱:超音波橢圓振動輔助車削之研究
論文名稱(外文):Study on Assisted Turning of Ultrasonic Elliptical Vibration
指導教授:鄧琴書
指導教授(外文):Deng, Chynshu
口試委員:張達元鄧琴書吳文章
口試委員(外文):Chang, DaryuanDeng, ChynshuWu,Wenjang
口試日期:2011-07-27
學位類別:碩士
校院名稱:國立聯合大學
系所名稱:機械工程學系碩士班
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:2011
畢業學年度:99
語文別:中文
論文頁數:54
中文關鍵詞:超音波橢圓振動表面粗糙度特徵頻率田口方法
外文關鍵詞:UltrasoundElliptical VibrationSurface RughnessEigenfrequencyTaguchi methods
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本研究之目的是利用超音波橢圓振動輔助切削來改善材料切削品質。在理論上,超音波橢圓振動輔助切削的切削力被建立,將切削力代入質量阻尼與彈簧系統的運動方程式,透過數學技巧解出此運動方程式理論預測值。在實驗上,首先超音波給予車刀單方向振動源,藉由車刀頭上擺放非對稱裝置,使原先單方向振動因為平衡被破壞,造成超音波x和y方向都有振動源產生,因而產生橢圓形振動。利用表面粗糙度儀量測工件表面的粗糙度值;並使用顯微鏡觀察工件切削後的表面切痕。利用模擬軟體找出CNC超音波切削車床的特徵頻率,結合田口方法分析控制因子對表面粗糙度的影響,控制因子包含切削轉速、切削深度、超音波的類型及進給速度,每個控制因子有三個水準使用直交排列實驗、信號雜訊比及變異數分析法,找出各因子顯著性與最佳參數組合。實驗結果顯示超音波橢圓振動輔助切削較傳統切削有較佳的加工品質。
The purpose of this study used ultrasound elliptical vibration-assisted cutting to improve material’s cutting quality. In theory, the cutting force of ultrasound elliptical vibration-assisted was established, we substituted the cutting force into the motion equation of mass, damping and spring system and solved the value of theoretical prediction for these motion equations by way of mathematical skills. In the experiment, first the ultrasound gave a vibration source to the turning tool in single direction, then the balance of the original one-way amplitude was upset due to the asymmetric unit on head of turning tool, causing the ultrasound generated vibration sources both in x and y direction and resulted in an elliptical vibration. After completion of the experiment, we used the Surface Roughness Tester to measure the roughness of the surface of the workpiece and observed the cutting marks by microscope after the cutting motion finished. Finally, we used the simulation software to identify the eigenfrequency of CNC ultrasound cutting lathe and combined with the Taguchi method to analyzed the controlled factors’ effects to the surface roughness. Controlled factors including rotation speed of cutting, depth of cutting, type of ultrasound and feed speed, each factor has three level by using orthogonal array test, signal-to-noise ratios and analysis of variance. Therefore, we could find the significant of each controlled factor and the best combination of parameters. The results showed that the assisted turning ultrasound elliptical vibration cutting better than the traditional cutting of the processing quality.
摘要 I
Abstract II
致謝 III
目錄 IV
圖目錄 VI
表目錄 VIII
符號表 IX
第一章 緒論 1
1.1 前言 1
1.2 文獻回顧 2
1.3 研究方法 3
第二章 切削理論 4
2.1 切削動作 4
2.1.1 刀具磨耗判斷 6
2.1.2 刀具壽命 7
2.1.3 正交切削方程式 7
2.2 超音波振動輔助切削與超音波橢圓振動輔助切削 11
2.3 表面粗糙度 22
2.3.1 表面粗糙度運動方程式 22
2.3.2 表面粗糙度之表示法 24
2.4 特徵頻率 27
2.5 有限元素法 27
第三章 田口實驗 28
3.1 田口方法(Taguchi’s methods) 28
3.2 直交表(Orthogonal array) 28
3.3 田口方法設計步驟 29
3.4 品質特性與S/N比 35
3.5 因子效應 38
3.6 變異數分析(Analysis of variance, ANOVA) 41
3.7 確認最佳化 43
第四章 實驗結果與討論 45
第五章 結論與建議 52
5.1 結論 52
5.2 建議 52
參考文獻 53

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