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For the hollow aluminum profile with corner and long cantilever, the extrusion process was simulated by analysis software HyperXtrude, and the influences of technological parameters such as extrusion speed, billet preheating temperature, container preheating temperature, die preheating temperature, billet diameter, billet length etc. on the standard speed deviation(SDV) and the standard temperature deviation(SDT) at the exit section of the profile were researched by the orthogonal test. The results indicate that the optimal scheme are obtained with extrusion speed of 1 mm·s-1, billet preheating temperature of 440 ℃, container preheating temperature of 420 ℃, die preheating temperature of 400 ℃, billet diameter of Φ150 mm, billet length of 450 mm, and the corresponding SDV of 1.3680 and SDT of 1.9130 by analyzing range and simulating again to ensure to get the extrusive profile with high comprehensive quality. Then, the influences of extrusion speed on SDV and billet preheating temperature on SDT are as high as 67.50% and 76.41% respectively by analyzing variance, and it is shown quantitatively that extrusion speed and billet preheating temperature are the main process parameters effecting the appearance quality and the internal organization of profile respectively. At last, the qualified products are extruded at factory, and the reliability of the optimal scheme is verified.
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