| 摘要註: |
Inconel 718為航太工業常用材料，鑽削有一定限制及加工之困難度，文獻參考過程中有不同探討加工特性之紀錄，但尚無大量觀察振動與磨耗之相關連探討。因此引發調查磨耗與頻譜分析之相關研究之動機。若準確掌握鑽頭磨耗的情況，透過振動觀察，則可避免鑽頭發生崩裂的情況、確保加工零件品質。受限於每支鑽頭之設計與使用壽命皆不相同，亦會發生鑽頭崩裂異常，因此若能從振動頻譜來預測刀具磨耗情形，則可避免不必要的成本消耗，更能及時更換鑽頭，有效地提升加工品質及效率 ,本研究將以INCONEL 718，找出優化的微細鑽孔參數條件，並以直徑0.3mm之微細孔為目標，然而隨著近代工業的進步產品一直朝向輕薄短小的趨勢發展，微細孔加工之要求，使得鑽孔作業漸漸朝向細徑化、深孔化、高品質化、高效率化發展。而微鑽頭長寬比高、強度較弱、排屑不易、散熱不佳等問題，在加工時容易造成偏擺、饒曲、快速磨耗與折斷等情形發生，因此加工過程充分了解微鑽針的磨損情形及振動的變化以避免刀具崩刀，形成了重要的課題。 本文主要選用L9(34)實驗計劃表以微鑽針的進給率、迴轉速、材料厚度及夾持長度為控制因子,在微鑽針鑽削實驗機對 Inconel 718 試片進行鑽削實驗，鑽削時經頻譜分析儀,快速傅立葉轉換,擷取振動訊號,而得到振幅均方根加速度值並使用掃描式電子顯微鏡來量測微鑽針鑽腹的磨耗量及試片擴孔量、真圓度。。利用田口實驗法進行各項所需數據之計算，繪製回應表與回應圖，而得到最佳加工之條件，鑽腹磨耗量最佳化參數組合為A1B2C1D2,振幅均方根加速度最佳化參數組合為A1B2C1D2，孔之真圓度最佳化參數組合為A2B2C1D1。圓孔擴孔量最佳化參數組合為A2B2C1D1, 由此最佳加工條件完成最終品質確認,經最終實驗驗證,均方根振幅量降低3.7 %,鑽腹磨耗量降低5.42%、圓孔擴孔量 降低5.29% 、圓孔真圓度降低8.50%，以此加工條件模式，建立微鑽針加工INCONEL 718材料的技術資訊,所得之最佳化提供業界參考。 Inconel 718 as for aviation manufacturing common material , owing to micron drilling with limitation and processing difficulty, many research with processing character study, however with less observation the relation between the vibration and wear characteristics that bring out my motivation for studying . This study is to determine the optimal parameters of micro drilling Inconel 718 material based on the with 0.3mm punch. However, Owning to recent decade industry progress development, the processing parts toward to the trend for thin, short ,and small package requirements that makes the drilling process developed into thin diameter, deep drilling and high quality and efficient. As The high length and width ratio of micro drilling , weak strength, and poor heat elimination would easily cause deformation, breakage, and crack in proceeding process. Our experiment team L9(34) considers the feed rate, drilling speed ,material thickness and punch length in Inconel 718 drilling and takes SEM microscope for measuring the flank wear out , enlarge hole ,roundness, and seized the vibration message at the same time. The optimal parameters combination are determined by data calculating of Taguchi Method and reaction ratio table and figure, After finding the optimal manufacture parameter , for the flank wear optimal parameter is A1B2C1D2, vibration is A1B2C1D2，the round hole diameter is A2B2C1D1。 For the roundness is A2B2C1D1, through proceeding the experiment verifying , we get the final result for micro drilling INCONEL 718 , as the vibration improve3.7 %,the flank wear improve 5.42%、round hole enlargement improve 5.29%、roundness improve 8.50% , sharing the gathering data for manufacturing information . |