臺灣博碩士論文加值系統

隨著鈦合金應用層面的加廣，相關零件加工品質之要求亦隨之提高，必須經過磨削加工才能滿足功能要求。鈦合金的低熱傳導率與高化學活性，使磨削高溫聚積在加工表層，造成砂輪黏附、堵塞磨損與加工表面之熱損傷，眾多困難已成為其未能廣泛應用的主要因素。因此本文針對磨削性能與加工品質，結合國內外熱烈研究之綠色製造技術來進行一系列之探討。
本研究運用二種綠色製造技術(MQL微量潤滑、液態氮冷卻)及傳統大量澆注冷卻以CBN磨輪執行鈦合金之磨削實驗。於磨削實驗過程中使用動力計與頻譜分析儀分別監測磨削力及振動量，並觀察在不同實驗參數下的磨屑、表面微觀與表面粗糙度，進行實驗數據分析探討。結果顯示，與傳統澆注濕磨削相比，微量油霧提供磨削加工區的潤滑及壓縮空氣的冷卻效果，減少砂輪的黏附有助於磨削力的降低。另從流動型磨屑觀察可得知，微霧油改善了磨削型態，得到比傳統濕磨削更好的加工面品質。而液態氮深冷加工充分發揮了冷卻優勢與特質使磨削區溫度處於低溫狀態，有助降低工件材料韌性與化學活性所形成砂輪黏附，保持磨粒鋒利進而提升磨削性能，促使磨削力、振動量與表面品質控制在較低的穩定水準。綜觀整體磨削性能表現可得知，提高磨削線速度與降低磨削深度可有效降低磨削力，減少砂輪黏附，獲得較佳的加工面品質。

Along with widening applications of titanium alloy, the requirement to the machining quality of related parts has been heightened, and their functions could be fulfilled only through grinding process. Due to the low thermal conductivity and high chemical activity of titanium alloy, the high temperature of grinding would be concentrated on the surface layer, which would cause the grinding wheel adhesion and loading, as well as heat damage on the ground surface. Numerous difficulties have become the major factors resulting in its failure of extensive application. For this reason, this study investigated the grinding performance and grinding quality in combination of the green manufacturing technology under hot research both at home and abroad.
This study conducted the grinding experiment on titanium alloy by two kinds of green manufacturing technologies (minimum quantity lubrication and liquid nitrogen cooling), and the conventional coolant by CBN grinding wheel. Dynamometer and spectrum analyzer were used in the grinding experiment to monitor the grinding force and vibration, respectively. The chips under different process parameters, surface morphology and surface roughness were observed to conduct analysis and discussion of the experimental data. The result showed that compared with the conventional coolant grinding, the minimum quantity oil mist provided lubrication for the grinding zone, as well as cooling effect of compressed air to reduce grinding wheel adhesion so as to reduce the grinding force. Observation on the flowing-type chip found that the minimum quantity oil mist improved the grinding conditions, and achieved a better ground surface quality than that of the conventional coolant grinding. Processing by cryogenic cooling has exhibited the cooling advantages and characteristics to maintain the grinding area at a low-temperature state, which could help to reduce material toughness of the workpiece and the grinding wheel adhesion resulted by chemical activity. Moreover, it could also maintain the abrasive grit under a sharp status to improve the grinding performance, and keep the grinding force, vibration magnitude and surface quality controlled under a lower and stable level. From the synthesis results and investigations, it shows that when increasing wheel speed and decreasing depth of cut that will be reduced the grinding force and grinding wheel adhesion, and the quality of ground surface will thus be improved.

中文摘要 …………………………………………………………… i
Abstract …………………………………………………………… ii
誌謝 …………………………………………………………… iv
目錄 …………………………………………………………… v
表目錄 …………………………………………………………… vi
圖目錄 …………………………………………………………… vii
第一章 前言……………………………………………………… 1
1.1 研究背景………………………………………………… 1
1.2 研究動機與目的………………………………………… 3
1.3 文獻回顧………………………………………………… 5
1.4 論文架構………………………………………………… 14
第二章 理論基礎………………………………………………… 15
2.1 微量潤滑技術…………………………………………… 15
2.2 低溫冷卻技術…………………………………………… 16
2.3 難加工材料……………………………………………… 16
2.4 CBN磨輪特性……………………………………………… 18
2.5 磨削機構………………………………………………… 18
2.5.1 砂輪-工件的幾何接觸…………………………………… 19
2.5.2 磨削力…………………………………………………… 22
2.6 表面粗糙度……………………………………………… 23
第三章 實驗方法與設備………………………………………… 24
3.1 磨輪組成與工件材料性質……………………………… 25
3.2 實驗儀器設備與規格…………………………………… 26
3.3 實驗方法與執行步驟…………………………………… 33
第四章 結果與討論……………………………………………… 38
4.1 磨削力…………………………………………………… 38
4.2 主軸頭座振動量………………………………………… 49
4.3 完成面品質……………………………………………… 59
4.3.1 表面粗糙度……………………………………………… 59
4.3.2 表面微觀………………………………………………… 63
4.4 磨屑型態………………………………………………… 69
第五章 結論與建議……………………………………………… 79
參考文獻 …………………………………………………………… 81
附錄 …………………………………………………………… 86
Extended Abstract …………………………………………………………… 110
作者簡歷 …………………………………………………………… 113

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