齒輪是機械傳動上最被為使用之機械元件之一，因傳動效率高，並因選擇不同之齒數、模數或自由改變與主軸之交錯形式都可得到較高之轉速比，故被廣泛的應用於航空業、機械業及汽車業。使用常溫閉模鍛造成形傘齒輪，可得到較好之機械性質，並和傳統切削方式相比可大為節省製程上材料之浪費，達到低成本高效率等優點，故使用冷閉模鍛造成形之技術亦逐漸受到業界上的注意。本研究主要探討是利用鋁合金Al6063-O之圓棒以冷閉模鍛造成形傘齒輪並配合導入電腦輔助工程(Computer Aided Engineering﹐CAE)技術及有限元素分析模擬軟體(Design Environment for Forming﹐ DEFORM-3D)來進行製程上的研發。並探討傘齒輪成形時之負荷-位移曲線、充填率配合DEFORM-3D來進行交互比對，以驗證實驗和模擬分析之準確性，並可透過模擬來分析材料成形時內部之等效應力、等效應變等參數，以利於往後製程或模具上之更改，大為縮短製程或模具研發所耗費之時間及人力。

Gears are one of the most important parts in mechanical facilities due to the high efficiency of transmitting force and motion from one shaft to the other. Those are used widely not only in aviation industry but also automobile industry. However, comparing with traditional metal cutting process, forging process offers mass production and reduces waste of material. Therefore, this study presents the cold closed-die forging process, a novel forming technique gear in forging bevel gear with both numerical and experimental studies. The study could be divided in the following steps: First, finite element method (FEM) was carried out to evaluate punch load and material flow for forming tool design. Second, punch and die were fabricated to perform closed-die forging process based on FEM results. Finally, verification of the load-stroke curve between experimental and numerical results was preformed. The results show that the numerical results are in good agreement with experimental results. The findings provide useful information for the improvement of the design of closed-die forging process.

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