Finite Element Analysis of Multi-Hole Extrusion of Aluminum-Alloy Tubes

• Main Authors: Wen-Chang Chuang, 莊文章
• Other Authors: Fuh-Kuo Chen
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/90307922785634994562

碩士 === 國立臺灣大學 === 機械工程學研究所 === 93 === The superior properties of aluminum-alloy attracted attentions from the light-trend industry recently. Although the principal manufacturing process of the aluminum-alloy hollow products has been extruded by using porthole dies, the seamless extrusion with a mandrel has considerable potential because of its competitive productivity and performance. So the seamless extrusion process of aluminum-alloy tubes at elevated temperatures was studied in the present study by the finite element analysis and experiments. The trend of processing load and temperature on single-hole die extrusion was studied at first, the finite element software DEFORM was employed to simulate the hollow tubes processes. The experiment of single-hole die extrusion was practiced to verify the analyzed results. The experimental results obtained in the present study show good agreement with simulations. It shows the finite element software DEFORM is suitable to process of seamless tube extrusion. In order to increase the productivity, multi-hole die with several mandrels is applied. But the defects, which are the bias of mandrel and the unbalanced thickness of production caused by material flow are critical issues. The influence of important process parameters such as the temperature, extrusion speed, production dimension, billet size, number and position of holes on die are analyzed by simulations. According to the results of analysis, it shows the serious effect could be caused by the number and position of holes on die. Besides, the material flow is better when the hole is near the focus of action area. The bias phenomenon of mandrel could be improved after die stress analysis by the software DEFORM. The results of this study can be reference resources for related academic research and can also be used to develop related products for industry production.