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研究生:賴宇勛
研究生(外文):Yu-Hsun Lai
論文名稱:超音波振動輔助車削之表面形貌與加工特徵探討
論文名稱(外文):An Investigation on Surface Topography and Features of Ultrasonic Vibration Assisted Turning
指導教授:蔡志成蔡志成引用關係
指導教授(外文):Jhy-Cherng Tasi
口試委員:蔡明義盧銘詮
口試委員(外文):Ming-Yi TsaiMing-Chyuan Lu
口試日期:2020-07-03
學位類別:碩士
校院名稱:國立中興大學
系所名稱:機械工程學系所
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:2020
畢業學年度:108
語文別:中文
論文頁數:80
中文關鍵詞:超音波振動輔助車削(UAT)表面形貌速度比斷續切削特徵
外文關鍵詞:Ultrasonic vibration-assisted turning (UAT)Surface topographyspeed ratiointermittent cutting features
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超音波振動輔助車削(UAT)技術在過去幾十年已廣泛應用於工業領域,因過去的研究鮮少探討加工表面形貌與特徵,故本研究針對單軸與雙軸UAT之加工,由加工路徑分析模擬,並透過實驗探討UAT之加工表面形貌與特徵。研究從切削刀尖點和工件之間的相對位置來分析加工路徑,發現其切削點振動速度與切削速度之比(速度比)ν為關鍵因素,於ν> 1時,會產生斷續切削之效果;進一步設計並進行不同速度比之實驗來驗證其加工表面形貌。實驗結果顯示,採用UAT加工,在切線與軸向方向振動均可有效改善表面品質,隨著速度比的增加,表面品質將變得更好;在相同加工條件下,ν=5.43相較於ν=0.23,切線Y方向振動之UAT,表面粗糙度降低了58.6%,軸向Z方向振動之UAT,表面粗糙度降低了55.7%,而雙軸YZ方向振動之UAT,表面粗糙度降低了57.8%。此外,表面形貌特徵量測結果顯示,切線Y方向振動與雙軸YZ方向振動之UAT,其XY平面投影之斷續切削特徵與加工路徑分析模擬近似,顯示加工路徑分析模擬合理。
Ultrasonic vibration-assisted turning (UAT) technology has been widely employed in industry in the past decades. While surface topography of UAT are seldom investigated, this study is aimed to investigate surface topography and geometric features of UAT through theoretical analysis and experiments. This study starts with analysis of the tool path, i.e. the relative position of tool tip point with respect to the workpiece. It showed that speed ratio ν, the ratio of maximum vibration speed to the cutting speed, is critical as intermittent cutting occurs whenν> 1. Experiments with different speed ratios in uni- and dual-axis UAT in tangential and axial directions are then designed and conducted as a comparison. The results showed that surface quality, in terms of surface roughness, are improved with higher speed ratio. As a comparison, surface roughness of workpiece, machined atν=5.43 and ν=0.2 respectively, reduced 58.6%, 55.7% and 57.8% for UAT vibrating in tangential, axial, and dual-axis. Furthermore, the measured surface features of UAT is similar to that by theoretical analysis. This shows the simulated model is a reasonable one and can be applied for future application.
摘要 i
Abstract ii
目次 iii
圖目次 v
表目次 ix
符號表 x
第一章 緒論 1
1.1研究動機與目標 1
1.2文獻回顧 2
1.3研究方法與流程 4
1.4論文架構 5
第二章 超音波振動輔助車削之加工路徑模擬 6
2.1無振動輔助車削之加工路徑模擬 7
2.2切線Y方向振動輔助車削之加工路徑模擬 8
2.3軸向Z方向振動輔助車削之加工路徑模擬 12
2.4雙軸YZ方向振動輔助車削之加工路徑模擬 16
第三章 前導實驗 21
3.1前導實驗流程 21
3.2刀把鎖緊力與振幅之關係 22
3.3鎖緊力大小影響振幅之結果 23
3.4刀把特性量測 23
3.4.1使用訊號產生器與高壓放大器之量測結果 25
3.4.2使用超音波驅動器之量測結果 26
第四章 實驗規劃 28
4.1實驗流程規劃 28
4.2實驗參數設計 28
4.3實驗設備與配置 32
4.4加工效果離線量測方式 37
第五章 實驗結果量測與分析 40
5.1超音波振動輔助車削之表面形貌與表面粗糙度量測結果 41
5.2超音波振動輔助車削之表面輪廓量測結果 47
5.3同角度與不同角度之表面輪廓量測結果 55
5.3.1同角度之表面輪廓量測結果 55
5.3.2不同角度之表面輪廓量測結果 59
第六章 結論與未來展望 64
6.1結論 64
6.2未來展望 64
參考文獻 66
附錄A:各振動方向之加工路徑推導 68
附錄B:重複切削特徵點數值量化 73
附錄C:量測重現性之曲線擬合係數與誤差值 75
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