- 學位論文
鋁基金屬複合材料鍛造成形之研究
A Study of Forging of Aluminum-Based Metal Matrix Composites
摘要
由於鋁基金屬複合材料非常適合製作欲輕量化且又具高強度之產品，而其成形方法又是鋁基金屬複合材料發展之關鍵步驟，因此本文針對鋁基金屬複合材料A6061/Al2O3之鍛造成形進行研究，鍛造製程可以改善鑄造製程的低良率與低生產速度，且相較於鑄造可提升強度，因此對鋁基金屬複合材料而言是很有利的成形方式。因鋁基金屬複合材料鍛造成形目前並無完整參考文獻，故先針對鋁基金屬複合材料的高溫機械性質進行研究，探討鋁基金屬複合材料高溫成形之材料特性。再設計一特徵造型做為研究載具，以有限元素法模擬分析探討鍛造後的凸柱高度與側壁高度之關係。並以成形過程中材料之流動方式、凸柱高度及鍛造負荷等為指標，探討鍛造溫度、鍛造速度與不同潤滑劑等製程參數對材料流動的影響。本論文之研究，鍛造時沖頭上加毛邊槽，可改善材料流動，由特徵載具鍛造成形實驗與模擬結果比較，有限元素模擬分析可以準確預測鋁基金屬複合材料鍛造成形中之材料流動方式與成形力。
並列摘要
Due to its lightweight and high specific strength, aluminum-based metal matrix composites have been widely used for structural components. Although the principle manufacturing process has been casting, the forging has considerable potential because of its competitive productivity and performance. As for forging, A6061/Al2O3 is considered as the suitable aluminum-based metal matrix composites for the manufacturing process at the present time. In the present study, the forging of aluminum-based metal matrix composites at elevated temperatures is studied by experiments and the finite element analysis. The forging process of a characteristic geometry is studied in the present study. The forging of aluminum-based metal matrix composites characteristic geometry at elevated forming temperatures was then investigated afterwards. In the forging process, a bulk is formed into the part shape in which a boss and side wall of certain height are required. In order to examine the effect of process parameters, such as forging temperature and forging velocity and die temperature and friction factor, on the formability of boss height, the finite element software DEFORM 2D is employed to simulate the forging processes, using the relations between boss and side wall height , material flow pattern, and forging load as forming index. The experimental results obtained in the present study provide the fundamentals for the forging aluminum-based metal matrix composites.