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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 廖運炫 | |
dc.contributor.author | Yu-Sheng Chen | en |
dc.contributor.author | 陳譽升 | zh_TW |
dc.date.accessioned | 2021-06-17T08:08:43Z | - |
dc.date.available | 2024-08-20 | |
dc.date.copyright | 2019-08-20 | |
dc.date.issued | 2019 | |
dc.date.submitted | 2019-08-16 | |
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Young, 'A new on-line spindle speed regulation strategy for chatter control,' International Journal of Machine Tools and Manufacture, vol. 36, pp. 651-660, 1996. [33] 孟尚賢, '銑削顫振之控制-主軸轉速調整方法之研究,' 碩士論文, 國立臺灣大學, 2002. [34] A. Sarhan, R. Sayed, A. Nassr, and R. El-Zahry, 'Interrelationships between cutting force variation and tool wear in end-milling,' Journal of Materials Processing Technology, vol. 109, pp. 229-235, 2001. [35] J. Feng, Z. Sun, Z. Jiang, and L. Yang, 'Identification of chatter in milling of Ti-6Al-4V titanium alloy thin-walled workpieces based on cutting force signals and surface topography,' The International Journal of Advanced Manufacturing Technology, vol. 82, pp. 1909-1920, 2016. [36] V. Nguyen, S. Melkote, A. Deshamudre, M. Khanna, and D. Walker, 'Comparison of on-line chatter detection algorithms in turning,' 2016 International Symposium on Flexible Automation, pp. 87-94, 2016. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73719 | - |
dc.description.abstract | 銑削製程由於能製作複雜形狀而被廣泛用於機械製造,然而不適當的切削條件之選用會容易產生加工時的顫振。再生式顫振屬於加工異常振動中最常見的一種,
會降低生產效率、減少加工精度、破壞工件表面、損傷刀具甚至降低工具機的使用壽命。再生式效應切削過程的動態切削力有關,在顫振條件下產生系統不穩定,引發自激式顫振。因為再生式顫振具有特定頻率特性,可以藉由架設感測器的方式,量測切削力或是主軸振動,進行即時頻率分析,做為判斷切削系統穩定狀態的依據。 本文提出一種線上再生式顫振的預測法則,目標為在顫振發生前判斷並且準確辨別顫振頻率。透過線上量測切削訊號並進行頻譜分析,檢查組成中頻譜強度較高的頻率是否屬於穩定切削的範圍,將穩定訊號與異常訊號區隔,並比較異常頻率強度比例是否達到標準,判斷是否屬於再生式顫振。藉由以上流程,當預測出顫振發生時,可以同時識別顫振頻率,以便後續顫振抑制的對策的進行。 為了測試線上顫振預測與抑制的可行性,以電腦程式實作顫振監控模組,實際進行顫振切削測試。不同材料與不同切削條件的測試中,顫振振幅成長時間約為0.3至0.5秒之間,預測程式則可在0.1至0.2秒內偵測到異常,在顫振尚未完全發展前判斷顫振即將發生。根據顫振抑制方法計算穩定主軸轉速進行調整後,有效抑制顫振使振幅收斂,驗證顫振頻率預測與頻率辨別的效果。 | zh_TW |
dc.description.abstract | Milling has been widely used in manufacturing process due to its versatile machining characteristics; however, applying inappropriate cutting parameters causes chatter problem easily in this type of machining. Regenerative chatter is one of the most common abnormal vibration in machining, which deteriotes material remove rate, surface integrity, tool wear and the machining center. The regenerative chatter is related to dynamic cutting force in the material removal process, where the system distablizes and induced self-excited chatter in specific circumstances. Since there are certain frequency characteristics in the chatter phenomenon, chatter can be distinguished by applying sensors and analyzing freqeuncy simultaneously during machining process.
In this thesis, a online regenerative chatter prediction rule is proposed, which targets at predicting the occurance and identifying the frequency of chatter. Applying online cutting signal measurement and spectrum analysis, frequeuncies with higher power would be recognised and checked if it were part of the stable cutting process. After discriminating unstable signals from stable ones, a magnitude ratio threshold test is applied to determine chatter existance. With the process proposed above, chatter frequency can be identified simultaneously as chatter is predicted. This feature allows faster respnose and provides critical information for chatter-suppress operation. In order to test the feasibility of online chatter prediction and suppression with the proposed method, a cutting process surveillance module is built and tested in chatter experiment. Under several different cutting parameters, chatter amplitude rising time stays between 0.3 to 0.5 seconds, when monitoring module identifies chatter 0.2 or 0.3 seconds prior to full vibration development. After applying spindle speed change according to suppression algorithim, chatter vibration is diminished shortly. The results prove the proposed chatter prediction rule effective in machining application. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T08:08:43Z (GMT). No. of bitstreams: 1 ntu-108-R06522724-1.pdf: 4737327 bytes, checksum: 1c6eb552083bebe413209eb7ff0a6a00 (MD5) Previous issue date: 2019 | en |
dc.description.tableofcontents | 摘要 I
Abstract II 目錄 IV 圖目錄 VI 表目錄 X 第1章 緒論 1 1.1 研究背景與動機 1 1.2 文獻回顧 3 1.2.1 再生式顫振與切削穩定性圖 3 1.2.2 線上偵測切削顫振 6 1.3 研究目的與方法 11 1.4 本文架構 12 第2章 再生式顫振的相關理論 13 2.1 銑床切削力模型 13 2.2 銑床的方向因子 15 2.3 銑床再生式閉迴路模型 18 2.4 再生式顫振頻率與加工條件之關係 22 2.4.1 軸向切深引發之顫振 23 2.4.2 徑向切深引發之顫振 24 2.5 再生式顫振抑制策略 25 2.5.1 簡化的閉迴路模型與特徵方程式 25 2.5.2 系統振動頻率與相位差之關係 29 2.5.3 主軸調整轉速方法 32 第3章 線上再生式顫振的預測策略 35 3.1 線上再生式顫振預測策略 35 3.1.1 傅利葉轉換與短時傅立葉轉換 35 3.1.2 再生式顫振的頻率特性 37 3.1.3 再生式顫振的預測法則 45 3.2 顫振頻率預測與辨別流程 48 3.3 線上顫振預測與抑制模組 53 第4章 實驗設備與方法 55 4.1 實驗目的 55 4.2 實驗設備與材料 55 4.2.1 加工設備與材料 55 4.2.2 量測設備 57 4.3 實驗設計與方法 59 第5章 實驗結果與分析 61 5.1 線上預測與抑制顫振模組切削測試 61 5.2 實驗結果分析與討論 90 第6章 結論與未來展望 93 6.1 結論 93 6.2 未來展望 94 參考文獻 95 | |
dc.language.iso | zh-TW | |
dc.title | CNC銑削顫振預測與抑制系統之研究 | zh_TW |
dc.title | Development of an Chatter Predict and Suppress System in CNC Milling Process | en |
dc.type | Thesis | |
dc.date.schoolyear | 107-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 蔡曜陽,李貫銘 | |
dc.subject.keyword | 銑削加工,再生式顫振,顫振預測,顫振抑制, | zh_TW |
dc.subject.keyword | milling,regenerative chatter,chatter prediction,chatter suppression, | en |
dc.relation.page | 97 | |
dc.identifier.doi | 10.6342/NTU201903923 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2019-08-17 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
顯示於系所單位: | 機械工程學系 |
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