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摘要
Finite element model of necking and thickening of 5A02 aluminum alloy tube was established based on DEFORM finite element simulation software. The simulation scheme was designed by orthogonal test, and the influence significance and forming law of wall thickness, tube blank diameter, die cone angle and feed rate on average wall thickness and wall thickness standard deviation of the thickened area during necking and thickening process for aluminum alloy tube were studied. The results show that the wall thickness of tube blank has the greatest influence on average wall thickness and wall thickness standard deviation of the thickened area. The larger the wall thickness of the tube blank or the faster the feed rate is, the larger the average wall thickness of the thickened area of workpiece is. Both larger or smaller die cone angles and tube blank diameters are not conducive to increase the average wall thickness of thickened area of workpiece. In addition, the smaller the wall thickness of tube blank or the die cone angle or the diameter of tube blank or the feed rate is, the smaller the wall thickness standard deviation of the thickened area of workpiece is. A set of optimal parameters was obtained by orthogonal optimization method, which is feed rate of 1 mm?s-1, die cone angle of 12°, diameter of tube blank of Φ22 mm and thickness of tube blank of 2 mm. Finally, the accuracy and reliability of this set of parameters were verified.
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