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中文摘要：
尾翼筒体结构件为某飞行器重要零件,采用铝合金等温挤压成形代替传统的钢质工件机械加工能有效提高材料的利用率、降低生产成本。通过分析形状特征,本文提出反挤压带通筋的筒体和侧向挤压凸台两步成形的方法。侧向挤压是成形的关键,通过数值模拟分析了侧向挤压过程中金属质点的流动方向、速率及等效应变的变化。结果显示：成形时,金属质点流线清晰、完整;金属流动速度均匀,层次分明;筋部产生的等效应变可增强性能,筒壁处的应变小,对筒壁性能无影响。最后通过实验,印证了模拟结果,进一步论证了该工艺的可行性。
英文摘要：
Tail tube structural part is a very important part of the aircraft,using aluminum alloy isothermal forming instead of the traditional steel workpiece machining could effectively improve material utilization and reduce the production cost.By analyzing the shape feature,two steps forming method,the integrated ribs being anti-extrusion and the bulge being lateral extrusion was put forward.The lateral extrusion forming was key,and by numerical simulation,the flow direction,rate and equivalent strain changes of metal particle in the lateral extrusion were analyzed.The results show that when forming,the metal particle flow lines is clear and complete;metal flow velocity is uniform and structured;the rib equivalent strain can enhance the performance,and the strain in the tube wall is small without influence on the tube performance.Finally,the experiment is confirmed with the simulation results and the feasibility of the process is further demonstrated.
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