针对小直径薄壁航空导管双翻边成形管件端头实际接触区宽度不均匀的问题，研究了模具参数对成形管件接触区宽度的影响。结果表明：第1道次和第3道次模具参数对结果影响很小，第2道次模具参数影响较大，其中圆角半径和圆角所占夹角有较大影响，半锥角度影响较小，成形管件端头接触区宽度随着第2道次凸模圆角半径的增大明显变宽，随着第2道次圆角所占夹角角度的增大先增宽后变窄，而第2道次半锥角度对接触区宽度影响较小。半锥角度应大于等于圆角所占夹角，基于正交优化方法，得到了最优参数组合为圆角半径R=20 mm,半锥角度为85°,圆角所占夹角为80°,此具有最好的成形效果，成形管件端头接触区宽度得到提升，使管件安装时有较大的密封区域，能有效提升双翻边管端头的密封性能。

Aiming at the problem of uneven width of actual contact area of double flanging forming end of small diameter thin-walled aviation conduit, the influence of die parameters on the contact zone width of the formed tube was studied. The results show that die parameters of the first and third passes have little influence on the results, while die parameters of the second pass have greater influence, in which the fillet radius and the angle occupied by fillet have greater influence, while the semi-cone angle has less influence. The the contact area width end of the formed tube end widens significantly with the increase of the die fillet radius of the second pass, and first widens and then narrows with the increase of the angle occupied by fillet of the second pass, while the semi-cone angle of the second pass has little influence on the contact area width. The semi-cone angle should be greater than or equal to the angle occupied by the fillet. Based on the orthogonal optimization method, the best forming effect is obtained when the optimal parameters combination are radius of fillet is R=20 mm, the angle of semi-cone is 85°, and the angle occupied by fillet is 80°. The contact area width of the formed tube end is improved, so that the larger sealing area of the tube fitting, which can effectively improve the sealing performance of the double flanged tube end.